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HomeMy WebLinkAboutBates 16939-17283 Appendix G - Geologic Resources Studies APPENDIX G Geologic Resources Studies G.1 — Preliminary Engineering Geology Investigation G.2 — Subsurface Fault Investigation and Development Setback Map G.3 — Preliminary Soils Engineering Report Froom Ranch Specific Plan Project Final EIR 16939 This Page Intentionally Left Blank. 16940 APPENDIX G. 1 Preliminary Engineering Geology Investigation 16941 This Page Intentionally Left Blank. 16942 PREL�MINARYENGINEERiNG GEOLOGY INV�STIGATIpN I'RO�MIEL VILLAGGIO SPECIFIC PLAN APNs: 067-241-030 a�td -031 SAN LUIS OBISPO AREA SAN LUIS OBISPO COUNTy, CALIFQRNIA PROJECT SLQ4734-1 Preparedfor Madonna Froom� Ranc[i C/o Madonna Consft•uction Conr�pany Past Ot�:EiceBox 391a San Luis Obis�o, Galifornia93401 Prepared by GEOSOLUTIONS, �1�FC. 220 HIGH STREET SAN LUIS OBISPO,CALIFORNIA93461 April 14, 2017 ,1. �� '` Gea5o�utions, �Nc., 1021 West Tama Lane,Suite 1p5,Santa Maria,CA 93454 220 High Streek,San Luis OUispo,CA 93q01 (805)G14-5333, (805}614-6322 fax (8d5)543-8539,(805)543-2171 fax SSinfo@geosolutions.net info@geosoluEions.net John Madonna c/o Madonna Construc#ion Coinpa�zy Post OfPice Box 3910 5an Luis Obispo, California 934�1 Subject: Prelimina�y Engia�ee��iug Geology Investigation Frooml El VilIaggio Specific Plan, APNs: Ob7-241-030 aiid �031 San Luis �bispo area, San Luis Obispo Couniy, Caiifo�'n ia Dear Mi•. Mado��na: Th�s P��el���ninary Eilgineering Geology I�i�estigation has been p��epaeed for khe proposed develapmeut to be located an t�te propet�ry refarred to as Froom/El Viilaggio Specific Plan located on APN Parcels Q67-241- 030 and -031, in the 5an Luis Obispo area, San Luis Obis�o County, Califo�'nia. Geologically, the site is generally suitable for tlae proposed developir�ent provided the recommendations in ihis repo�-� ar•e inco��oratec! into the design. As no final site deveiopme��t pla�is were available for review, only general statements��egardi3�g geologic site suitability aY'e presented. The site is pritnarily cotnposed of Francisca�� Co�nple;c unii�s in the western uppe�� topagraphic regions covered with a venee�• of stuface soils [colluvium and aliuviuin). Alluvi�l sed�nle�lts are witiiiil the eastern lower topogra�hic regions. The prope�ty is �rossly stable. Ground water in the lower elevation areas is high {up to l.5 feet #'i'om gro�md surface), the e:�pansion of soils has bees� measured as up to vciy laigh, a small landslide is mapped at tlle site, and springs are observcd at the site. One small area i�as a potential for rackfaIl du�'ing a seismic event. Based on the ca�3sistei3cy and relative density of the in-situ soils, the potential foa' seismic liquefaction of sails at tt�e 5ite is Iow. A s�ibsL�rface fault study was c4Enpleted at the site {under a se�arate i•eport) ancE the Los Osos fault is i7�ap�ed throligh the site with developme�7t setbacks applied according#o activity. Gez�eral conclusions and reco�nmendations a��e included w[thin the repoi�t. GeoSoiutions, Inc. appreciates the opportunity to pr•ovide tec�lnical serviccs to you. S1�oL�ld you have an}� qliestio��s �•egarding this 1•eport, please cail (805) 543-8539. �;'���'... Y:: Sincez�ely, . �SS1d�IL��0�_ �EoSolutioa►s,Inc. �.�� ��N� ������ � r� q N0.2?1� � in � "� C�R71FfEi� '� J6 n I�a�mnet�, C.E.G. #21]8 ; �NGINEERING Pr•incipal ��,� �'L�l-pGf57 1V�'as-cl-df-181555L09500-SL099991SL09734-]-Tladnnna I'room R��' SL697.1�- �i. �ll'ItiL 3017 Proom F.ng Geo_doc ..�. �cat.i�o� �...�.��t - 16944 € k TABLE OF CONT�NTS F ? 1.0 LNTRODUCTION............................................................................................................................I ;; 2.0 CONCLUSIONS ...................................................................................... :. 2.1 Geologic Co�iditions............................................................................................................2 � 2.2 LandsIides,Rockfall, and Liquefaction...............................................................................3 ; 23 Seismic................................................................................................................................3 ;'� 2.4 5eismicalIy I��duced Ha�at'ds...............................................................................................3 , 2.5 Groundwater and D�ainage..................................................................................................3 '', 2.G Asbestos ..............................................................................................................................3 � � 3.0 GENERAL RECOMMENDATIONS..............................................................................................� � �.0 SITE D�SCRIPTION.......................................................................................................................b 5.0 PURPOSE AND SCOPE.................................................................................................................6 6.0 ENGINEERING GEOLOGY INVESTIGATION ...........................................................................7 6.1 Regional GeoIogy................................................................................................................7 6.2 Loca[ Geology.....................................................................................................................7 G.2.1 Surticial Units.........................................................................................................'1 6.2.2 Formational Units...................................................................................................9 6.3 5urface and Groundwater Conditions................................................................................10 7.0 LANDSLIDES ...............................................................................................................................10 8.0 FLOODING AND SEVERE EA05ION........................................................................................10 9.0 ON-SrTE SEPTIC SYSTEMS .......................................................................................................10 10.0 HYDROCOLLAPSE OF ALLUVrAL FAN SOILS......................................................................I O 1 l.0 REGIONAL FAULTING AND SEISMICITY..............................................................................10 11.1 Los Osos Fault...................................................................................................................l 1 1 I.2 Ground 5hakiilg........................ ' .........................................................................................13 � 1 I.3 Ground 5urface Ru ture Due to Faulti� � P g..........................................................................14 11.� SeismicalIy Induced Water Waves and Floodi��g..............................................................14 ' 11.5 Seisinically Induced Settle�nent and Slope FaiIu��e............................................................14 12.0 LIQU�FACTION ANALYSIS......................................................................................................I� 13.0 GEOLOGIC HAZARDS................................................................................................................15 I3.1 Expansive SoiIs .................................................................................................................15 I 3.2 Natuz'ally Occu��ring Asbestos............................................................................................15 13.3 Radon and Ott�er Haza�•do�ts Gases ...................................................................................15 14.0 SUBSIDENCE...............................................................................................................................15 I6.0 VOLCANIC ERUPTION...............................................................................................................lb 16945 17.0 ADDTT�ONAL SERVICES ...........................................................................................................lb ';' ; f 18.0 LLMITAT10N5 ����6 � ........................................................................................................................... ; REFERENCES FLATES 1'late lA, 1[3, 1C-Site Enginec3-ing Geologic Map Plate l D, 1 E, 1 P—Fault Sethack Maps Plate 2—Site Cross Sections Plate 3A,3B-Regional C}eotogic Map,Tlall, 1973 and Geologic Explanations Plate 4-Regional Geologic Map,PG&E,2014 and Geologic�xplanations Plate SA,5B-Regio��aE Geologic Map,Dibblee,2006 and Gea[ogic Explanations Plate 6A,6B—Aegional Geologic Map, Weigers,20[1 Piate 7A,7B—Lettis&f lall, [994 and Geologic Explanafions Plate 8—Google Image with USGS KMZ Paulting—2016 Plate 9—Spccial SCudies Zone—1990 Plate 1 Q�-LiDAR lmage-201 l Platc 11—Region�l Fault Map,Jennings,2010 and Eaplanations Plaie 12—SupeG'imposed Fault Map Pl�te 13A, 13B—Historical Seismicily Map and l Iistnrica[Seismicity List Flate 14—Landslide Haza�•ds Map, San Luis Obispo County 1]epartment of Building and I'lan€�ing, 1999 Plate 15—Flood InsuG�ance Rate Map,rEMA, 1985 and Explanation P[ate lb—Geologic Study.A�-ea Map and Explanations,San Luis Obispo County Department of Building and Planning, [993 APPENDIX A �' 1 Boring Logs GST-#Trench Logs :i T.abor�tory Data � Fault Trench Logs �� North Wall of`i'rench T-2a—L,ettis Cons�lCants intemational,inc. � Pholo Log of Ta�ench T-2B Nm-th Wa11-I.ettis Consu[tants Inte€-national,Inc. :� Photo Log of Trench T-2A South Wall-Lettis Consultants internationa[, Cnc. � Asbestos Lah Results � � � ,`I� � '� 'E i � f � � i e � � 16946 � I I t PRELIMINARY �NGINEERING G�OLOGY INVESTIGATION PROPOSED FROOM/�L VZLLAGGIO SPECI�'IC PLAN APNS: 067-241-U30 AND -U31 SAN LU�S OBISPO AREA, CALIFORNIA PRO.T�CT SL09734-� i.0 INTRODUCTION T�iis re ort �'esents the eesults of tl3e ' '" . �on9usA�o � � \ 1� r a'� n /r Ar-"� �_. � � rel iminar en uleerin eolo '�` ,,��,�l�E°! � � aC-4.�i�'� "� h � Y � g g �Y , �,. �, ���� "`^�� ., ���bE�����flE :�__.. ��' t� ��,)l� 4T �����. ,, _ i��vestigation for the proposed Fi•aa�n/El ��� ;r ��.�° `�G%,�� $�� c��,���.,: �r , --(r .L Vlllei 10 � CC1�1C Plclil �O b� located c`it �� - \'� I\jo-a-y�'(�,�,v����`.,�ia� a� �"'-Pp���a'� � �� P ;�oa��:, ��a �� �. ����,., '�a � ,l':.'� ��_iA\C, �9,�\�1��i��<`f� �-"s°a ' ��-'_:� the Madomia — Frooin Ranct� loc�tec� �� �.;�a � �f a � . ' \�;,��. ,a � i , ' i .. ,� ! r°so _. , fi along Los Osas Valley Road, nea�• the �� , `� ` ,4� ,Y� �q �. + l ,�L junction with Calle Joaquiil adjacent to � r ��.�y, , � � �35.248050,-120.G8fi144 W� , .. the City of Saz� L��is Obispo, Califarnia. _ ' q'�, � � � �' � o�` �1 ` �,��� APNs are OC7-2�1-03Q a�id 031. See � ��1' . � ,'� I�� .� ' :jl��, �, _�` ���`��'_�� � ,�� Pig��re l: Area Lacation Map Por #he � ;;.. i �� `� ,I'�-��>>�£; ��,;: , �� �� general locatian of the project area. �1 ', ' ` 4 , ���� )° �� �a, , ! � � �� . � .;.� ��,� �� , � � � �7� �� t i ,,_r fn�� 5 � �� 1� ( ik� �� . ' �1 , �1 to5o.n5vn.LiEVH a The p�oposed developiiieilt is located at � _��_'.,',;,'� � 1 �� ` ,�,, � � y `� � „°��l ` � `. ' rr ! l °�` i��� a roxiinatel 35.2�8050 de rees no�-�h ` " ;1�i� - � � �'' `°� ���=�� Pp Y g �-� , �.,�'l, � �.� {at�hlde and approaii��ately -120.68b 144 -- -_ - _, ;';%`rf�' --- � I(f��•�� � � ��,��� j`r� ,— =%> �- �. ti �� "��, i � de��ees west longit��de at a�� elevatioii �:-�-"` � �+�:-- '�'�',�( '��/�� = i — � o ta Us ivueci lo�[cns. e Qf �])p['OX1IIlc`it���/ Ily �ee� {VaI'105} �wurm�.Toaa�na€a _ •. vnWe�Uih10,[dn 'n••' C�e 2ram 3}i, above mean sea Ievel. The ��earest intersectioi� is where Los Osos Valley Figure 1: Area Locatiai�Map Road intersects Calle Joaquin at the southeast cor��er of the prope�ty. T��e p�'oject properties wilI hez�eafter be collecti�eiy refer�'ed to as the "Site." The Site is characterized by flat to roIiing grasslands with natural drainages wlz3ch rise ta steep, rocl�.y I�ills at the southweste��n portion of the prope��ty k��awn as the Irish HilEs. The pz�ope�ty is approxi�nately"U" shaped with#he pro�osed development witl�in the sotEthern area of the property. Tl}e Site is developed witl� several otde�• ��anch buildin�s a�7d cLu�rei�tly utilized foz' cattie/horse g��azing. Sur�'ace drau�age iollows topography to tlze middle- southern portioil of the Site towa�'ds T'room Creek tllaY tz'a�veeses through the property fra�n ttie ilorthwest. Native grasses, b�'i�sh, a�td scatte��cd t��ees currently vegetatc tl�e Site. The proposed developi�e��t is to include the construction of ��esidential strLict�zres, community buildrngs, restaurdnts, fitness centers, pa�•lcs, i•oadways, and draiilage facilities aild associated i�np�•oveinents i�acludi�ig but not li�nited to; sidewallfs, site retaining�valls, boundaey walls, ai7ci retention basiils. Tlle proposed development is ta incl��de the construction of �ni�eci �•eside��tia[ and coina��e��cial developme��t. The p��opased structtn�es are a��ticapated to be consteucted using light wood fi•aming andlor light gauge steel/structural steel. Plates lA, 1B, a��.d 1C are a Site E��gineering Geologic Maps (Plates 1B and 1C are enlargeinents of Plate lA) tfiat depicts local geologic conditions. Plates 1D, [E, IF are kault Setback Maps {Plates IE ancf 1F are enla��ge�nents of Plate 1D). PEate 2, Site Ci•oss Sections, presents two interpl•etive sections tl�rough the property. Plates 3A, 4, SA, 6A, and 7A are Regional Geoiogic Maps {Hall, I973; PG&E, 2014; Dibblee, 2006; Wiegers, 2011; and Lettis and Hall, 1994), depict geologic co�iditions in the vicinity of ille prope�-ty. Plates 3B, SB, 6B and 7B p�'esent Geologic Exp�anatians. Plate 8 is a Google image of the �eoject site with euree�it USGS fault lincs fi�om KMZ files. Plate 9 is tl�e State of California Special S��dies Zone Map in the area. Ptate 10 is a PG&E LiDAR i�nage of the area of the sE�bjecf pt�operty. �late 11 is a Regional �'ault Map (3emii��gs, 20l a} that depicts 16947 Proom/Villaggio Spccific Plan I'a�elimina�-y�ngi��ee��ing Geology lnvestigation ApciL 14,2017 L'rojectNo. SL09734-1 fault locations zn tltie viciiiity af the site. Plate I2 is a Supe�•imposed Fault Map sl�owing a compilatzon of f�uIts 3 mapped by othe�•s. Plate 13A, Histo�'ica[ Seismicity Map a►�d �'late 13B, Historical SeisRnicity List depict s[gnifieant historical ea��thquakes in the �•egion. Plate 14, �,andslide Hazards Map (San �.uis Obispa Caunty f Department af Plamiing a��d Buildiiig, 1999) depicts tl�e County of San Luis C)bispo landsiide hazard potentiai in tlie vicinity of the Site. Plate 15 is the Flood I�Zsurance Rate Map and Exp[anatio��s shawi�ig the location of the 100-year flood zone in �•elation ta the Site. �late 16, Geolagic Study Az'ea Map {San Luis Obispo County Departme�lt of Planning and Building, 1996) depicts the pt�operty in �'e[ation to the gealogic study a►�ea. GeoSoiutions, �nc, conducted geological recon�iaissa�ice mapping, t�'enching, and drilling fi•om the dates of May 18 to rune 7, 2016. This ��eport discusses geologic conditions obse�•ved at the Site and provides general engineering gcalogic i•ecoininendations regarding proposed development. This repo��t was prepaeed in partial accordance with San Luis Obispo County Department of Planning aud Bui[ding Land Use C)�'dinanec Sectian 23.07.084 and Guidelines far Engi�}eering Gcology RepoY�s, December 2013. Tl�e �•eport is in partial confor�nance of the guidelines as the p��oject is in conceph�aI planning stages and no fmal pla��s ha�e been �' p��epared. 'I A Subsurface Fauit Investigation and Developtne»t Setback Map �'eport was prepa��ed (detailed in a separate the characteristics of tlie Los Osos fault tlaz'ou h the sub'ect site GeoSolutio��s, �ne., A rii 14, 1 7•epoi�t) to assass g � ( P r 2017}. For the fault investigation, a series of 10 sets of fault ti•encl�es (1 S indi�idual trenches total) were ','I excavated. The fault at the site exhibited charactet'istics of active move�nent (mo�ement within tlie last I1,000 years before p�esent or Holocene i�� age, offset i►� colluvial sedimeiits}, Quaternaty age (Iast 2 iniilion yeats before � present) �novement, and pre-Quate�-�iaEy movement (movement p��ior to 2 �nillion years before present). Deve9opment setbacks fi�om the Subsut'face Fault L�vestigation and Development Setback Map �-eport are p�'ovided withiii this Preli�ninaiy E��ginee�•ing Gealogy Investigation�'eport on Plates 1D, 1 E, 1 F (where Plates 1 E and 1F are enlargeme�its of �late 1D). Specific recommei7dations for develop�nent setbacics are within the � Subsurface Fault I1i�estigation and Development Setback Map report. � � 2.0 CONCLUSIONS � As ��a final develop�nent plans are prepared, no final statement can be made regarding geologic suitability of the � proposed specific development at the site. Howevez', genet'al geologic site chaa�acteristics are pz'o�ided for pta�3ning purposes. 2.1 Geolo�ic Coriditions Francisca�� Co�nplex fo�'�national units of inetavoicanic rock, g�'eywacice saiidstone, serpenf:inite, cEaystone, and chert were encountered near the surface, within borings and trenches, and along slopes in the vicinity of the property. Fo1•mational �nate�'ial is I[mited to the western upper-elevation a�'eas of the site. Su�'face material in the eastern lower-elevations generally cansisls of very da�k grayish b�'own sandy clay and da�•ic gray clay encounte�'ed approxi�nately fro3n ground sui�face to vat•iotts depths depending upon location. Underlyi��g these surface tnate�•ial are fotmational units assigned to tl�e F�•ancisca�� Complex. A total of six explo�•ato�y trenches and four soil bo�'ings by GeoSoiutiof�s, Inc. we�•e conducted at the property for this Preliminary Engineei�i7g Geology Znvestigatian. In addition, a fault st�idy was conducted at the site and 15 fault tt�enches were eYcavated at the property for the fault st�idy. Based upon obser�ations made during t[�e field investigatio��s, excavatian �nay be by ca►»entionai g��ading equip�nent iiz the upper elevatian areas although localized hat•d to very hard rock ca��ditions (chert, serpentite}should be anticipated dL�ri��g gcading and underground utility excavation. Soil expansio�s is veiy high (ei o�18b fot' one of tlie samples} via laborato�y testing. Stability of cut and fill slopes in fo�'�national units and capability of geolagy to support stt'uctures is ca��sidered good if the recominendations withiii the SoiIs Engineering Report and this Engi�ieering Geolagy Report afe incot'porated into design. Grading, 16948 z Geo5olutions,��u�. , :, � �. :�;�. ��Y_: ,.�. .. ,_ .�.� ,..�� � !; I: ProomlVillaggio Specific Plan Prcliminary Enginecring Geology In�estigation April 14,2017 Pa•oject No. SL09734-1 excavations, and site wock(especiafly subsurface utilities)to be devcloped in the easte��n lower•-el�vations at the Site should anticipate high-gz'oundwateE•. 2.2 Landslides Rockfall and Li uefaction S6opes are p►'ima�•ily co�nposed of Fra��ciscan Complex units covez'ed with a veneer of colluviutn or alli�vi«m. The western upper-elevation portion of the property is grossly stable. One Iandslide is mapp�d by the undersigned at the p�'operty aithough no landslides a�•e �r►apped at the site on published �iiaps. Slopes at the site appea�' generaIly stable. The poteR�tial for a iion-seisinicaIly induced slope iiistability to affect the pi�oposed development is considerecl low. The potentiai foi' rockfall at the overaEt site is considered low although oEie aeea de�naicated on PIate lA shows a Iow to moderate potential fo��rockfall. The liquefaction hazat•d at the 5ite is consid�red 1ow in tlie t�ppet'-elevations of the site. Ln tl�e lowe�• eIevation areas, based on the coz7sistency and�•elative density of the in-situ soils the poteiztial fo�' seismic liquefaetio�i of soils at tl�e Site is low, 2.3 Seismic The potential for grouiid rupt«re at the Site du�'ing ground shaking is considered �nodet•ate due to the � p��esence of thc Los Osos fault th�'oug17 the site. A fault study (GeoSolutions, Inc., April 14, 2017) was ;� conducted at the site and develop�r►ent setbacks fi•om the t�'ace of the Los Osos fault through the site hav� � been established. Two Site Class's for the proposed st�«ctu��es have been pt•ovided; the deepened alluvia( a deposits in the eastez'n low�r-elevations at tlie site a�•e Sitc Class E and the near-su�'face bedrocIc in the � western uppe�'-elevations ace Site Class C. The Seismic Design Category for tl7e p�'oposed sh•uctures is D. � The subject site is not located within an Earthqualce Fa«It Zone. 2.4 SeismicallY Induced Hazards The potential for a tsunami to affect the 5ite is low due to eievation. Flooding associated with a seismic event is considet'ed low due to the absence of a body of water upslope of the Qroperty. AssL�ining that the �•eco�nmendations of the SoiEs Engineeriiig Report are i�nplemented, the potential foz' seismically induced set�le�nent and diffecential settle�neizt at the Site is considered to be low. Des[gn a,,,ax for the Site is equai to SD�=0.A25 g and 5D5=0.854 g, fort� the western uppe�•-portioii of the Site (Site Class C) and Si»=0.774g and SD5-0.769 g for tlie eastern lower-portion of the Site {Site CIass E}. The potential for ridgetop shattering is considered moderate if strtictures are located at the top of local ridges or peaks. 2.5 Groundwater and Drainage Groundwatec was e�icountered during the st�b-surface investigation to a deptl� of L5 feet bgs in t€�e eastern lowe��-eIevations of the site. Ground water was not obse��ved in the western upper-elevations of tlie site althougll spz'ings were mapped in the uppe►' elevations. Natural surface drainage is di�'ected toward the established drainage at Proom CreeEt. 2.6 Asbcstos Seipentinite rock was encounte��ed at the site du��ing tl�e surface and subs��rface investigatio�i. A composite sample of serpentinite rock was sub�nit�ed for labo��ato�•y analysis for asbestos and chrysotile asbestos was detected. Site disturbance is a��ticipated to be gi•eatet• than ] acre and San Lu[s Obispo Couizty Air Resource Board dust contt'ol measures are recommended to be incorporated into project plans. The California Air Aesources Boa��d S�ction 93105 (Caiifor�iia Code of Regulations, TitIe 17), Asbestos Airbo�•ne Toxic Cont�'oI Measures for Construction, Grading, Quat•rying, and Surface Mining Operations (e)(2), Rec�uirements for Construction and Gradiilg OQet'ations state that dust mitigation 16949 � Geo5olutions,iN�, � � -..�;� � � FroomlVillaggio Speciflc Plan Prcliminary Engineering Geology Invesligation Ap�•il 1�,2017 Project No. SL09734-1 measures be initiated at the start a�fd maintained througi�out the du�•ation of the consn�uction oz' g►•ading activity. � � 3.0 GENERAL RECOMMENDATIONS f It is unde��stood that speci�'ic plans are not available so oa�ly gene��ai recom�nendations are provided for planning purposes. Reca��nmendations include: 1. It is recommended tl�at the project utilize diffe��ent seisinic design criteria according to general locatio�� of p��opased develop�nent. As the��e is deepened alluvium i�f the eastern lower-elcvations and near�su�'face formationaI matei•ial in the westein uppez'-elevations, seismic design criteria�nay be diffet'ent aecording to genei•al area of de�elopment. i: 2, �t is recoimnended that the reco�ninendations within the GeoSolutions, Inc. April 14, 2017 rault lnvestigation and Developme��t Setback repoi�t be incorporated into desig��. 3. It is recommended that loose surface rocks in the poteiltial rockfall hazard a�ea be removed or• mitigation (small beizn, ditch, fence, wall) be estab[ished upslope of p�'o�osed development to �,� mitigate tl�e potential fort' rocics to roll towa��d the develop�nent. As development plans become � available, mitigation may be it�corporated into the desig�7 af the developinent. 4. It is t'ecommended that the soils engineer at�d e�ginee�•ing geologist�•eview the project plans prio�' to constructio�f. 5. Difficult digginglexcavation conditions should be anticipated due to Iiard rocic conditio3�s in uppez•western topograpl�ic at'eas at the site witl�in Frai�ciscan CompleY material. 6, lt is recommended that the z'ecommendations within the project Soils Engi�ieeri�ig Repo�-t be inco�•po�•ated into design. 'I 7, lt is recom�nended that tl�e project engineering geologist and soils engineer obseive �oundatio�� excavations, keyway, a�d benching excavations and conduct site visits during caiist�'uction to verify recomme��datiatts within tifis report and the Soils Engineering repo�-t. „ E � � S. It is tecommended tliat keyways and be�fclfcs of fill slopes be founded into Fra�iciscan Co�nplex � inaterial whe��e possible. It is i•eco�mnended that keyways and benches follow curre��t Building Code guidelines. Drainage of t�iese keyways will be assessed at time of consh�uction. 9. Foundations fo�'st►•uctures are recommended to be in engi��eered f 11, within Fcaneiscan Coinplex tnateY•ial, or co�npetent E�ative material. There is a potential fb�• differe�itial settlement occu�•ring between foundations suppo��ted oa� two soil mate��ials lia�ing difFere��t settlement eharacteristics, such as native soil, formatia�al material, aiid engi�iee�•ed f Il. It is recommended that all of tl�e foundations are founded in equally competent uniform material. 10. Su�•face drainage is recommended to be conh•olIed to prevent conce��teated water-flow on either �iatural or constructed slapes. Su�'face drainage gradients sl�ould be planned to prevent ponding and promote drainage of sut'face water away fro�n building foundations, edges of pave�nents and sidewalks or natural o►•tnan-inade slopes. l i. Scepage is a�ticipated along the ii�ter�ace of the su��face alIuvial/calluvial �nnatet�ials and the unde�'iying fb�•mational units. Seepage witl�in fo��rriational u�iits sl�ottld also be anticipated. 16950 � GeoSnlut�inns,��u�. .. �_ ,- � � I � � ProomlVi[laggio Specific Plan 1'retiminary k:nginee��ing Geology Investigation April 14,20[7 ProjectNo. SL09734-1 Surface d�'ainage faci9ities (g��aded swales, gutters, positive grades, etc} a��e recomtnended at the base of cut slopes that allovv su�'facing wate►� to be t�'ansferred away fi�om the base of�ie slope. Tl�e project desig�sea' is Y•ecomtnet�ded to offe�' specific design criteria for mitigation of water drainage behind wafls and other areas of the site. This is especially i�nperative upslope of y retaining walls fot' residences. Material such as Akwadrain or Ameridrain o�• equivalent should ` to be installed on the wall per manufactl��'er's specifications. A cont�•acto�• experienced in this type of installation should be coilsulted for this wo�•k. Dcainage from the subsurface should not be connected into conduit fiom surface drains a�id should not con�lect to downspout drai��age pipes. ; ,: I:. ,; I2. Drainage fi'o�n surface and subsurface areas is recommended to be directed to established drainages. I3. Excavation, fill, and const�•uction activities a�'e recoinrtnended to be in acco�•dance with appropt�iate codes and o��dinances of the City of San Luis Obispo. In adciition, uni�sual subsu��face conditions encountered during grading such as sp�•ings or fill matet'ial are recom�nended to be brougkat to the attention of the Engitaee�'ing Geologist and 5oils�ngineer. 14. It is recomme�ided that numericai slope stability analyses be conducted on pe�•�nanent soil ot•t�ock slopes cut steeper than 2-to-1 (ho��izoiltal to vertical}. Due to the presence of cotnpetent �tnits of the Franciscan, Co�nplex in the subsurface, un-�•etaiiled cut slopes txp to I.S-to-1 {horizontal to vertical) �nay be coilside��ed under the slxpervisioil of the Engiizee�'ing GeoIogist or Soil Engineer afte�' determining cock quality and perfo�7ning a stability an,aiysis at that particular location. Locally steepe3•slopes�nay be aflowed depending on furthe�•st�tdy and slope stability ana(ysis, � i i I5. Tl�e foIlowing dust �nitigation meastn•es are recom�ne�aded to be initiated at the start and maintained throughout the duration of the construction or grading activity. i. Const�'uclion vehicle speed at the vvo�'Ic site must be limited to fiftee�i{15) miles per hour or less; ii. P�'ior to any ground distu�•bance, sufficient wate�- mt�st be applied to the a�•eas to be disturbed to prevent visible emissions fi•om crossing the p�'operty line; iii. Areas to be graded o�' excavated must be kept adequateiy wetted to prevent visible e�nissions fiom crossing the p�•opeEty line; iv. Storage piles must bc kept adequately wetted, t�'eated with a chemical dust suppressant, o��covez'ed vvhen inaterial is not being added lo or re�noved fi•om the pile; v. Equipment inust be washed down before moving fi•om the propeity onto a paved pi�blic �'oad; a�id vi. Visible tt•ack-out ots ti�e paved public road must be cleat�ed using wct sweeping or a HEYA filte��equipped vacuu�n device within twenty-four{24)hours. vii. A dust mitigation plan is �•ecommended for tlae s[te. 16. Fill slopes designed or co�istructed steeper tha�z Caiifor�zia Building Code require�nents (2-to�l horizontal to vez�ical) are reco�nine�lded to be evatuated by a numerical sIope stability ana�ysis completed by the project soils engineer. 17. lt is recommended that contracto�'s be aware of potential high groundwate�' in the lower eastern topogeaphic areas. Ground stabi[ization may be necessaiy aizd �nethods and requireauents may be predicated on the depth to groundwatet•duE•ing construction. 16951 5 GeoSo[u�ions,��u�. .�_ _ �.�:t �.�. .,�. __.�. � Froo�n/Viflaggio 5pecific Pl�n Prcliminary�ngineering Geoiogy Investigation April 14,2017 Project Na. SL09734-1 4.D SITE I}ESCRXPTION The Froom/E� Villaggio Speci�c Plan is located �n the ' genei•al vicinity of 35.2�8050 degrees norkl� latitude anci : � � �~ �� 12Q.b86144 degeees west. The pt•operty is irre�ular in �:>>��'�`'�' ' . •' shape and l l 1.39 acres in size. The site is bounded by __ _ _ -- _ _ Los Osos Valley Road to the nortl�-east, the Home De�ot ,:,-�:.- __ - ._��,�;�.�.-. ._ -��-. , 1 T.J Maxx c�evelop3nent ta ihe north-tivest, a - -- _•-�„��';�"""�_�„� �= - cambi�iation of deveIopzr�ent and open space to tl�e �,��- �;����' ""�' •�.� -� -:_-_ "- - - south, and the Irish Hills Nat�i�al Reserve o en s ace to `'"''��;-, • ��":�''� ��� P � _�'"�'w - �i "- , .. the west. The ��earest major intersection is where Los :,�, `� �' �' Osos Valley Road intersccts I-Iighway 101 .s' �,�-� r ''~ � ��'".�-��""'�;� approximately 500 feet south fi'ozn the most easte�'ly � "� ' �i r �. -�'�rkwM�ny�l� portion of the �roperty. k � �� �`� ' S� �� 4 �{iC` � +kyg S4 i ti��,`�y �� !" � ,it� The 5ite is characterized by flat to rolling grassland with �,�-"���` - s -� . �w ' •..� � �r�`�' ' `-� an exis�ing irrigation basin which rises to a steep, rocky Figurc 2: Vie�v north of the lower clevations at the hill at the westerly edge of ti�e propezty, lcnowil as tha S�te. Irish Hills Natural Reserve. The Site is currently developed with few farna/c'anch bui�d'nigs and �ndeveioped a�nongst most af the southern portion of the site utiEized For anii3lal grazing. Ann��a[ grasses, sh��ubs and a few trees ctirrently vegetate the Site. S�u'face draina�e generalIy follows tl�e topagraphy towai�d tl�e east priimariiy toward the Feoom Cree[c draiiiage. Anticipaled cut and fill is not knowi� at this time. The pcapei�ty will hereafter be referred to as tije "Site." �levat�on varies but lower elevations a�e app►'a�imately 1 10 feet above sea Eevej. Tlle si�ni�g Ce�-tified Engiilee�'ing Geologist conducted site investigatior� on May 19 ancl June 7, 2016. Figure 2 shows a gene�•a�pictlire of tl�e site from upper elevations of ille prope€�ty loolciilg no��[heast. 5.0 PURPOSE AND �COP� The purpase of t11is shidy was tn evaluate engineering geologic hazards at the Site a�1d to develop co��clusioa�s and recommendations regarding general site cievelopme�it. Tl�e scope of this investaga�ion consisted of: 1. Resea�•ch a�1d a-eview of }�eitinent publisiied geokog�c literatti�re, regional fa��[ti��.g and seismicify maps, previous site investigatEor�s, aet'ial pl�otog��aphs, topographic maps, LiDAR imageiy, consulting re�orts, a��d web-based i�lfo►�mation as listed in the reference section of this cepo��t; 2. A review of i�egional faulting and seismicity t-�azards. 3. Meetings with project planners and develope��t�egardiz�g�r•oposed cfevelopineilt; 4. A �•eview of Ia��dslide potential, surface watet'and groundwate��ca��dit�ons, and lic�uefactio��hazards. 5. Subsurface investigation i�zclud'u�g t�'enching ar�d drilling to determine subsurface conditions. 6. De�elapineilt of ge�ieral �•ecoYmneiidations fo��site pr•epar•ation. 7, Pre�a3�ation of this repoi�t that suanma�•izes our F'indings, conclusioi�s, and recoinmendations regarding enginecrii7g geology aspec#s ofthe project, 16952 � GeoSolu�ions,in[c. F�'oom/Villaggio Specific Plan Prelimina3•y EngineeG�ing Geology lnvestigation Apeil 14,2017 Project No. SL09734-1 G.D ENGINEER�NG GEOLOGY INV�STIGATION 61 Re ion�l Geolo The site is located in t17e vicinity of the San Luis Range of the Coast Range Geomorphic P�'ovince of California. The Coast Ranges lie between the Pacific Ocean and tl�e Sacrame�ito-San 1oaqLti�a Valley a�id trend nortliwestet'ty along the California Coast fo�• approximately 600 miles bet�ueen Santa Maria and the ;; Oregon bo�'deY'. � � 6.2 Local Geolo�y Locatly, tl�e site is located along tl�e southwestern flan�C of the local Santa Lucia Mou��taizl Range and east of the adjacent Irish Hiils, The site is generally withiii Franciscan Coinplex units and alluvial deposits. Plates 3A, 4, SA, 6A, and 7A a�'e Regioiial Geologic Maps of tiic geEieral vicinity of the Site and Plates 3B, SB, 6B, a�id 7B provide descri�tions of these Regional � Geologic Maps (Hall, 1973; PG&E, 2014; Dibblee, 2006; Wiegers, 2011; and Lettis and Hall, I994). These authors have gencraily tnapped the s�te as within 7ut'assic and Cretaceous age{205- 63 mybp} i'ranciscan Co���plex unYts with all«vial tnate�'ial in the lower elevations. �ur exploz'ation of the area gene�'ally encounteced units of the F�•anciscat� Complex and a1lu�ial deposits. Information de�'ived fi•om the subsus�face ex�loration was used to class.ify s��bs��rface soil aild fo►•mational units and to supplement geologic tnapping. Subsurface investigation was perfor3ned by GeoSolutions, Inc. fo�� this study and consisted of 4 borings ai7d 7 tt'enches (labeled GST-# fo�'the soil investigation t�'e�1clles}. A fault study was also conducted at the site and a series of 15-fault tt•enches were excavated to determine subsurface conditions {fault trenches are labeied T-#}. Boring deptl� was to a maximum of 46 feet a��d t�'ench depth was to a maxitnu�n of 25 feet below land surface(bls). 6.21 Surficial Units Dri[ling was foc�►sed on the lower eIevations at the prope�•ty to ascertain the depth aizd consistency of the subsu�'face conditions. The sLirface mate��iais at the Site generally co�isisted of vety darlt grayish browra sandy fat CLAY (CH) encou��teY•ed in a dry and soft to fiiTn co�adition and darlc brown to black sandy CLAY {CH) eracoL�ntered in a vet•y moist a�1d fi�'tn to stiff co��dition to approximately 45.5 feet bgs. Tf�e txiaterial in tl�e lower eievations of the site is termed "colluviu�n" (Qc) and alluvium (Qa�). BoE•ings B-1, B-3, and B-4 es�countered clay, sandy clay, and/o�' clayey sand to termination at IO feet bls. Boring B-2 terminated at app�•oximately 46 feet i�� ha�•d material interpreted as F►'anciscan Com��lex, �uliich is a(so �'efei�•ed to as competent fo�'�national material. Highest gro►►ndwater was encountered i�i boring B-3 at a depth of 1.5 feet. Soft, wet clay was observed i�i the lower topogi�aphic a�'ea bori�igs. Gene�•ally, the t�ppez' topogi•aphic areas eracountered dense material at de�th within the formational unit. Units at the site consist ofthe followi�ig: FiII - �i11 was intet'preted at t(�e pr•operty in developed a�•eas and is comp��ised of clay, silt, sand, II and geavei. I Colluvium - Colluvial material enco�►ntered at the p�'oject is assumed Hotocene in a�e. Colluvral ', �naterial is olive black (SYR 2.S/t), dar�C g��ay {10YR4/1), vefy da�•k greyish brown (lOYR 3/2), ', black (lOYR 211} and is i��terpreted to be �esultant from weathecing of�►nderlying soil and ��ocIc ' material. Vat•iations in coiluvial matea'ial oecurced according to location. Caliehe (ealcium ' carbonate) is observed within this un'st. Colluvial deposits within fault trenches T-2A and T-2B 16953 � GeaSalutOnns,�ntE. � . _,. .. � � � ��:� �_ � ; F Froom/Villaggio Specific Plan Prelimi€�ary�ngineering Gcology�nvestigation April 14,20[7 Project No. SL09734-1 were logged in detail by Lettis Consultants I��te�'national, Inc. (LCI}. Photo logs of the LCT treraches are contained within Appendix A. LCI states the colILiviuin is "si[t with occasional pebble to medium cobbles, Brown (lOYR 413); clasts a��e domi��antly Franciscan, increasing i�} size to small bouldet•s to west, angular, fi'act�red, slightly weathered, matt•ix is eolian s�lt, witl� some clay and spa�•se fine sand; loose, moist, slightly to rzaoderately col�esive; a sut'Face soil sequence is developing in unit." Thickness of this unit varies depending upon Iocation bl�t, in gener•al, is appt'oxiinately 1 to 3 feet thick as observed within the fau[t tt•enches. Landslide Deposits - Landslide deposits ace mapped in a small sec#ion of the sabject propei�ty just south of City of �an Luis Obispo p��operty. Tlzis matecial is composed oF elay, silt, sand, gravel, and cobbles. Colo►'va�•ies depending upon location but is gcnerally olive brown 2.5Y 4/4. Thicla�ess is unknowra but is estimated to be approximately 1 foot to several feet depending upon location. No h'enches or borings encou�7te��ed tl�is mateeial which is interpreted fronra su:•face expression. Stream Deposits — Sh'eat�n deposits are assutz�etl Holocene in age. St�'eam deposits were � obse��ved in fault trench T-5. This unit is co�nposed of geavel and cobbles in a matrix of sand and silt. This material ap�ears to be dei�ived from Frooin Creek d��ainage. Color was light yeilowisf� brown, [OYR 614. Thickness of this unit within the trench is appt�oxi��ately Iess than one foot but could be thicket' depending upon area especially within sn-eam a�•eas. T�iis materiai is �nap�ed a[ong the Froom Creek dt•ainage that�lows through the prope�-ty Aliuvial Deposits � Alluvial matet•ia] was e��countered withi�� most fault tt'enches (T-#) ducing the fault investigation. Generally, alluvium within the fault n�enches encompasses that material that underlies colluvium and overlies F►'anciscan Complex bedrock. Generally, alluvial deposits a�-e comp�'[sed of clay, sand; silt, pebbies, cobbles, and bouldeY's (up to 2-feet diatneter). Clasts we�'e cotnposed prima��ily of Fraraciscan CompEex rocic and Monterey Fot•mation matetial that is rounded to subrounded. Caliche was observed wit�iin tl�is unit. Most Alluvium is matrix (sand, clay) supported. Color of the unit varied depending upon location. Colo��s ��anged fiorza Enoderate yellowisl� brown (1�Y 514), pale yellow (SY 7/3), bt'ownish yellow (10YR 616), bz'own (7.5 YR 4/4), pale brown {10 YR 6/3), dat•k greyish bz'own (lOYR 412), dark b�owt� (1 OYR 3/3), to dark yellowEsh brown{l 0YR 4/4}. Tr�nching to obtain soil sainples for soils engineering pat'poses (trencl�►es [abeled GST-#) occuY'1•ed at the prope�-ty. T�'enches GST-1 a��d GST-2 encountered reddish brown silty and sandy clay termed coliuviunra fro�n grouiid surface to 2 feet b[s. Fra��ciscan complex matetial was below coiluvium to totai depth of appeoxi�nat�ly 4.5 feet bls. Teench G�T-3 eiicountered dark brown si[ty clay with �'ounded cobbles (to 1-foot diameter) fi�om g��ou�id surface to I.5 bls. This material is interpreted as a(luvium. Franciscan co�npiea�natet•iaE was below this a(luvium to totaf depth of 2.5 feet bls. Treilch GST-4 encountered a pebbly silty clay iazte�p�'eted as aIluvial deposits fiom gi�ourad sarface to totai depth of 8 feet bls. Trench GST-5 encountered dark brown silty clay (inte�'p�'eted as colluvium) fi'otz� ground st�rface l0 2 feet bls with F��ancisca�� Complex material below. Trench GST-5 encountered dark brown si1Ty clay (inte�•preted as colluvium) from g�ound s�tr•face to 2 feet bls with P�•anciscan Comptea inaterial below. Trench GST-6 encountet'ed tla�•k b�•own clay (i�rte�'preted as collwium) fiom ground surface to 3.5 feet bgs. Tt'ench GST-7 encountered silty sandy clay with cobbles, pebbles, a�id bouldecs to a deptlz of 25 feet bis. TE}is material is i��terp�•eted as alluvium. 16954 � Geo5olut�ions,�N�. Fa-oo�nNillaggio Specirc P11n Preliminary Engineering Gcology invesLigation April 14,20 E 7 1'rnj ect No. 5L09734-1 6.2.2 Formational Units Hall (1975) desct'ibes the Franciscan Co►nple� (KJfinv) as inetavolcanic rocks, p�•imari[y greenstone (metamorphosed fi�ocn basalt}, and diabase commonIy associated with red chet�t. Hall et a3. (1979) describes the Franciscan Compiex (ICJfmv) as inetavolcanic �•oc[cs {gceenstone), prima.rily metamoiphosed basalt and diabase. Comtnonly associated with �•ed chert. Locally ciat'[c red and extensiv�ly sheaR'ed. Considered to be tectonic blocks o�i o�• within or beIow Franciscan melange and p�'obably equivaIent to upper part of Jurassic ophiolite. The tliicicness is unk�iown but is lilcely several thousand feet. Tlie F�'ancisca�i Complex encountered du�'ing the geologic �napping and subsurface investigatiot� included metavolcanic roc[c, gE'eywacice sandstone, se�`pentinite, claystone, and ciiert. Tkae thiclaless of F�•ancisca�i CompRe� at the Site is un[cnown. Outerop of chert, serpentinite, anci g�•eywac[ce sandsto�i� of tkae Fi•a�iciscan Complex was obsetved at the site. PG&E(6/20I4} desc�'ibes the Franciscan Complex in the �'ollowing manner: �'he CrTetaceous to Jarrassic Fr�crnciscan Co�nplex (unit syn��bol KIf rvTzes•e icndif�es°entiated) in the p�°aject area consists of���icltiple liChologies. The n�osd widespread F��atzciscan- Conzplex a���it r�s n7�elange (unit sy�nbol KJfi�a) ��itl� krrackers of gr•aytivacke (grv); slaale (sh); schist {scla); blieeschist (6s); cor�gloTaaerate (cg}; naetavolcanic rocks (rm�); silrca carbor�ate (sc); and green, white, 07" l�ed clzet't (cl�). Also tividespYead are n�apped bodies of 3772fLIVOZCQYl1C ��ncks (KJfrnv}; serpentinite (s); and graytivacke (KJfp�. In one area Po1�t San Lurs—a ��rappable body of opl�iolite is categorized as part of the Franciscan Coi��plex (KJfo), t•eflecting its e�nplacenaent l�istor y and hvnoi°ing tl�e original age designation of these r•ocks by Hall (1973a). Litl�ologic contcrcts tivithin the Franciscara Co��plex are abssost ezelusively faar�lted. In co�trast a�nit bour�dal°ies betiveen the Fra��crscan Cnn7plex crnd yoasnger units are a �nixtt�re of ur�conforn7able contacts and fault contacts. At tlze su�face, the size dist�°ibietion of saib-units withzn the Ft•anciscan Cor�iplex is cnnside�•crble, ranging in scale frnr�� se��eral n�eters ta several kilora�eters; rt is likely that strcl� > a size distj�ihutrorr is ps•esent at depth. Within any given szcb-unit, tlze size and e� densr�t7�dish°ibutiorr of fi�actarring and ather irock dr.sconti�zuitr�es is also»at°iable � het�veen scales of tens to laicndreds of n�ete��s. Tl�is ��esults in frec�uent � il juxtaposition of highly fr�actured and cornpetent bedrack. ;� i� Structu�•al attitudes were difficult to observe at the Site due to the massive, highly fractured, and weathe�ed composition of the foimational u�ait. No attitudcs were obtained at the szte. Ct'oss sections 1�1-A' and B-B' presents a subsut'face inte�pretation of the pt�operty. Section A-A' is from the uppet• elevations to the lowe�• elevations. Section B-B' is along tlie Iowe�' elevatioii '' portion of the property; Section B-B' is aEmost exclusi�ely withizi alluviat deposits with underEying Franciscan Complex bedrock. ;j � As tl�e property is large, variation in E•oc[c type sllould be expected. Fraiiciscan Co�nplex ��ocic at the site varies � feom fiesh to very inte�isely weather•ed,veiy ha�'d to �e�y soft, and massive to stightly bedded (iai clsert}. F�'actu��es � within tkae t'ocic vai•ied depending upoiz the t'oc[c type aild Iocation, and varied fiom inode�'ateEy to ve�y closely = � spaced, ciiscoiitinuous to siightly continuous, fractu�•e ends could be seen in the exposure, openness was tight to modez'ately wide, f[ling thicltness was no fim coating to moderately thin, inoderately healed, stepped to smooth � roughness, and dry fractur�s with wate�' flow possible. Harciness of tlie rocic va�'ies; chet•t and some types of � � � 16955 9 Geo5olut�ons,�n��. ,.�� ��� , ,., .....�..._� �_.v�w� � f 1 � � Froam/Villaggio Specific Plan Prelim€nary�ngineering Creolo�;y lnvcstigation April 14,2017 Pa•oject No.SL09734-I serpentinite are veiy hard and may �•equi�•e special excavation techniques. It should be anticipated that utility tre�lches and cuts may encounteE•difficult excavation due to rock hardness. s `s x 6.3 Surface atid Groundwater Conditions I; �: �urface deainage flows app�•oxiEnately east in �ile upper eie�ations toward Froom d►'ainage. Froom drainage was dry d�tring our site visits. Du�•ing the surface and subs«rface i�ivestigation, the higitiest � gi�oundwater was encountered at 1.5 feet bgs and �aries with iocatio��. Springs we��e observed at tise � prope�-ty a�sd a��e noted on the Site Engineering Geology Maps. At least two wate�'weils are Ecnown on tlie prope�-ty. 7.0 LANDSLIDES A landslide was tnapped at the site but no landslide is rcp��ese��ted on published geologic maps. Small surface slumps wez'e also observed on the p�'opet-ty. Ai�photo analysis does not show indication of large-scale landslide �naterial at the propeity. Due to the presence of near surface Fra�iciscan Co�nplex u�iits,the non-seisinic landslide potential at the Site is considered low. 8.0 FLOODING AND SEVERE�ROSION The site has locations that are within or nea�• the 100-year flood zone based on k'ederal Emergency Managetne�tit Agency flood zone�naps (Plate 15A). 9.0 ON-SIT� SEPTIC SYSTEMS No septic system is p��oposed. The p�•oject will utiiize a co�n�nunity sewe��and watert•system. i0.0 HYDROCOLLAP�E OF ALLUVIAL FAN SOILS The potentia[ of hydrocollapse of soils is assumed to he rnodeeate if cyclicai wateringldewatering of sedi�nents in fhe Iower elevation areas is conducted. 1i.0 REGIONAL FAULTING AND SEISMICITY Sizx�ilar to the surrounding a�'eas, the Site may be affected by moderate to �najor eat�hq��a�ces ce�itered an o�sc of the kiiown large, active faults listed i❑ Table 1 below. Mome�t magnitudes a�•e expressed, atthougii any ! significant event on these faults could result in �noderate to severe ground shalting at the subject site, The ' pote�tiai fo�� ground failure at the Site during ground shaking is conside�'ed �noderate due to the likely presence of the Los Osos fault h•aversing th�-ough tlie site. TABLE:NO. 1-Hal.o.cene A:ctive.Fauits. : Closest Active Fault,s to.�ite Approximate Distance{miles} : Mome.nt Magnitude Los Osos 1.5 7.0 Hosgri 8 7.5 San And�'eas 38 8.0 The closest known active Quaternaiy age fault is the Los Osas fault app�'oxi�nately Iocated at tEie property. The closest ltnown active portion of a Holocene age fault �s the active Los Osos fault that is located appz'oximately 8,00� feet nortii-northwest of the Site {Jeii�}ings, 201�). Plate 11 is a Regional FauEt Map fo�' the area. Plate 7A 16956 lo Geo5olut�ions,iN�, ._ �� � - �,a��- __ �.��, Proom/Villaggio Specifc Plan Prclimir�ary Engineer'sng Geology Investigatior� April 14,2017 Yro.ject No. 51.0973�4-1 depicis the location af the Ea��thquake Fa�tlt Zoaie in relatian to the M�do�tina Fraoin site. "�'he San A►}d�•eas fa�ilt is the niost likely active fault to produce gcou��d shaking at the Site although it is not expected to generate the higliest ground acce�e��ations because of its distance from the Site. The potential for ridge-top shattering o�' ►'idge-top spreading is considet•ed inoderate if st�•uctures arc located on Iocal ridgelines o�' pealcs. Hawevcr, obvious evidence of tidge-to� sp��eading, shatte�•ed graund, sharply defi�ied scarps, side hill benclies, shallow depressions, fissures, sackung, or li�iear t�'oughs we�•e nat observed during the site i�rvestigation. ll.l Los Osos Faulf The Los Osos fault is mapped tl�x'o��gh the subject prope��y as depicted o� Plates IA — 1F. Lettis and Ha11 (1994) subdivided the Los Osos fault [nto four segments, fi'om t�ie narthwcst to the southwest they are the Estero Bay, Irish Hills, Lopez Reservoir, and Newsom Aidge seg�neirts. The Irish Hills segment is about 10 to 12 miles long ���� and extends fi•om the Paci�c Oceail near Los �sos eastward to Sa� Luis Creek and inciudes the st��dy area. This � a segment of the fault fo�'ms the bounda�y between the Los Osos Valley and the �rish Hills and has document�d ; Holocene offset{PG&E, 1488). P.G. &E. suggcsts that the Irish Hills segtnent displays the most well-expressed � geomorphic featut'es dis�lacing Iate Pleistoce�ie and HoIoce►�e deposits. A po��tion of the l�•ish Hills segment is I considered active and has been included within A1R�iist-Priolo zoiiing by t�ie State of California (1440). Plate 9 i depicts tlie Earthqualce FauIt Lone Map {State of Caiifornia, 1990}. Piate 7A depicts the approxiinate location of the�arthc�uake Fau1t Zone in relation to the Madonna Froo�n site. The Los Osos fault zone has had a cozzlplex histo►•y af both st�ike-slip aiid dip-slip displacement{Lettis and Hall, 1990}. The fault zone is a 50 k�n long,2 km wide systcm of discontinuaus, subpa�'allel, and e�}echelon fault traces extendi�ig ft'om Este�•a Bay on the north to an iiztersection with tl�e Wcst Huasna fault southeast of San Luis Obispo. Along the caast, the fault zone truncates a flight of znarine ter��aces, indicating a vertical ��ate of sepaz•ation across the fat�lt zane of about 0.2 mmlyr. Prclimit�arty results feam new geomo�•phic mapping, interpretation of rep�'ocessed seismio-��eflection data, analysis of seis�nicity data, and structu�'al analysis suggest that the fauit zone dips steeply to the southeast {�5 to 70 degrees o�� possibly steeper), at�d may be pi•imarily an oblique-slip fauIt, with a significant cotnponent af dip slip to accommodate t�piift of the range. {PG&E, Januaiy, 20I 1, Shoreline fault study) A fauIt study was conducted at the site and ��eferenced herein. The Los Osos fa�ilt at the site exliibited clza�'actieristics of active movement {movement vaithin the last 11,000 years before �resent or Holocene in age, offset i�i colluvial sediments), Quateinaiy age {last 2 millian yea��s befoz'e p�'esc�it) �navement, and pre�Q�tate�•na�y movement (inove�nent prior to 2 million yea�•s before prese�it). StE•ike of the fa«[t in several of the t�•enches is approxiinately similar. Fault strilce in T�•encl� 3A is N50W, in Trencli 3B is N60W, in Tre��ch 2B is N�2W (to approxi�nately N2�W), Trench T-7 is N27W. The fa�llt study �•ecommended development setbacics according to activity of the fault. Fa«lt trezach logs are contained in ApQendix A. ,�ennings 2Q10, maps the Los Osos fault through the site as "Late Quaternary fault dispIacement (during past 700,000 years}. Geoinoz'phic c�ideE�ce similar to that described fo�� Holocene faults except feah�res are less distinct. Faulting tnay be younger, but lack of yaunger overlyuig deposits precludes mo��e accurate age classification." An active fault sectioz� of the Los Osas fault Iocated approximateiy 8,000 feet no��thvaest of the subject propet�y is Iabeled on tlle Jennings, 2010 map (Piate 11) as "Holocene fault disQlacezzlent (durfng �ast l I,700 yea�•s) witl�o�Et historic �•ecord. Geama�•phic evidence for Holacene faulting includes sag po�ids, scatps showing little erosion, or tlze folIowing features in Holocene age deposits: offset stt'eam cou�•ses, Iinear scai�ps, shutter ridges, and triai7gula�� faceted spurs. Rece►�cy of faulting affshore is based on tiic inter�reted age of the yoiingest strata displaced by faulting". Stud.ies performed by P.G. & E. {1988) iiidicate that tl�e fault is a zone of � � 16957 I I Gea5alutQons,�Nt. �- ,�^� � ! i: I' r Frao�n/Villaggio Specific Pl�n Preliminary k;ngiueering Geotogy lnvesCigation April 14,20I7 Project No.SL09734-1 ��o��hwest t�•ending high and [ow angle faulis that exhibits a complex histoa'y of bot11 strik� sli� a�id reverse ; displacement. The Los Osos fault is described by PG&E(b-20I 4) i�i the following znamier: The Los Osos fault zv��e tivas characterized by the LTSP (PG&E, I988} and I ettis arad Hall(1994) as a late Qa�ater��a�y j�eve�•se fault that defi.nes t1�e no��tl�er�ra and 1�ortlzeastej•n 3nargin of the Sara Luis Range. The Los Osos fault is characte�'ized in the vicinity of the Madonna Frootn a�'eas as: The sozctheastern �nost r°eacl� of the Los C?sos faarlt zo�ze within tl�e h�ish Hills stard�� area--- infarnzally named the east reach—is app��oxi�nately 6 to 7 k»a long and is located het�veen San ; Luis Obispo Creek arad a poind appr•oxi�nately 2 ,�Cin west-t�artl�west af the it�te�•sectror� of West � Foothill Boulevaj°d and Los Osos VaIIe}�Road(A portion of this reach is depicted o�i Plate 7A of � this Madomia Froom report). Tl�is reach iracludes ah�°iipt scarps at�d tonal ancl vegetatire � lineanzents at as�d n.ear tl�e i�ange front and a Ii�ear fault zane vvitlzin Franciscan Complex serpenti�ite alotag tlze,footlzills soutlz. of the range fi'ont (Lettis and HaII, 199�}. No systel�aatic late7°al deflection of st�°ear��s crnssing the li�ea���ents vr bedrock faz�It t��aces ���as nnted fi�orn LiDAIz vr field evaluation. Paleoseislnic trenches ac�°oss seve��al Ii�eala�ents and tlze bedrock faxalt zone ��evealed e��iderace for late Q�caternary fairlting along the east reach, althoargl� tl�e relationsl�ips between faulling, scarp fo��aativn, and differ��eratial arplift of tlz-e Irish Hills relati>>e to the Los Osos Valley tivere locally zanclear and ca�flicting (Lettis and Hall, I99�1J. The n.os•theasterra.-naost trench---Ingley tr�ench T-2— crossed a northeast facing, 6-r��-high topogr�aphic scarp near Los Osos Yalley Road and contained el�idence for a gently (22 to 29°� soutl�ivest dipping zone of tl�rust faults within alluviac�n tl�at shnr�tened and 1°epeated a pf�o�ninent soil horizon. Slickensides were corasistent i��itl� dip-slip ,fairlting at�d a left-late��al colnponent. The f'aislting exposed here x�as intefpr�eted to be tl�e range frof�t Los C1sos fault. Othes�t��enches tcpslope nf the Ingley trerzch T-2 i-ve1°e less st��aigl�tfot��va�°d Fo��exa�azple, a t�^encl�. act�oss t1�e bedrrock fault zone (Ellsx�artlz. h•ench T-1) exposed evidence for faulted Quaterncrry gravels alorag a steeply nortl�east-dipprng f'aiilt �vith south�-vestside-da�» ver�tical sepa�°ation. Sh°iations at�d falding of Quaternary strata tivere consistent tivith no��tl7east- (valley) side-up reverse faulting. Trencl�es across p�°o��ainent scarps farther dotivnslnpe (at the Cuesta and Ingley sites) ezposed evidence that san�e scarps i�>>er�e not associated 3-vith faultirag crnd tlzirs tive��e nzast likely erosio»al {Cacesta h�erach T-1), so�a�e faailts a�etting Quate�°nar•y allasviura� dic� raot have r•ecogrrizable geo�norpl�ic expj-essivn (Ci�esta trenclz �3), arad a prominent �vrtl�east- (valle}�) side-dnwn scarp was z�nderlar� by a nnrtheast-dippirag faz�lt placing Fi-anciscan Co���plex i�2elange it� the hanging i-vall against Qz�atet•nary alluviar.�n i�� t1�e foot�vall (indicating valley-side up faar.Iting) �vith slickensicles consistent witl� pu1�e dip slrp (Cuesta tret�ches T-2 a�d T-3). Otlzef• faaclts �vitl� geof�7orpl�ic expression. sin�ila�l�� sl�otis�ed evidence for• �of°tl�east- {valley) side-acp rever�se displacement tivith I I'ranciscan Complex r�oclrs fairlted against late Quatef��zasy deposits (Ingley tye�zch T-I). Lettrs aj�d i Hall (1994) praposed alternative explanations foj• the a�nexpected obsei^vations, incli�dilzg sca�p � for�nation by ej^osional (as opposed to tectanic) processes, arad nor�raal �°eactivation vf earlier Qarater•�2ary r�evef•se faults. �'I�e pr�eferr°ed interp��etatron in gener•al i�vas tl�at defor�s�atio� observed rn t�°encl�es zn the f'ootl�ills and nea1� tl�e r�ange fi°ont ��>>as secondary, hangrng-���aII deforja�ation abare an zrnde�°lying, southtivest-dipping tl���zrst o�° re>>erse fault t17at projected up dip to t1�e r�ange fi^ont af the .Is�ish Hills (e.g., szcch as at Ingley t�^e�zd� T-2). Alter�native iraterpretations ta explain the conflicting relatio�zship het}veen the geonaorpl�ic sca�ps and faafltrng observed in tl�e tres�cl�es wef•e proposed�vith ina�lications far pvssible changes i�� dip ivith depth on an irnder�lying s•ange- fi�ont faa�lt(Lettis and Hall, 1994). Althoaigh tl�e east 1•each of the Las Osos fairlt zone rvithin the Ir�isl�. Hills seglszent inclardes 11�e sti�ongest evidence for• a shallow or� emergent, soactlzrs�est-dippit�g Lns Osos reve��se faarlt, the 16958 12 Gea5a�ut�ans,�Nr. ��„�,� .��.s,.�,,~ ;��q,;� ���.,. _�,.. � � � �: ProomNillaggio 3pecific Pl�n Preliminaiy Engineeri��g Gcology Investigation Apri1 f4,2017 I'rojectNo. 51.,09734-1 absence of a fooh��all basirr, and the lack of a coi��pelling, laterall��-contina�oars fairlt (o��fault scarp) at the szarface is also consiste�t W�it1� a ra�ostly blind Los Osos rever,se fa�clt or a fold hirrge ; at t12e range fr•ont that is locally br�okerr by discontinzaoars faaclts. Inte�pr�etations of seis��zic- r�efTection data ac��oss t1�e east and east-cend°al reaches of tlze Ii•ish Hills sl�aarld co��sicler tlze obsel�vatiorrs of steep faultirrg irr Fr�anciscan Can�plex r�ocks at t1�e sauface (par�ticaclarly tlze serperat�inite-defaned fault zo��e alo��g the footl�ills sub par�allel to tl�e r�a�z.ge fr�ofzt), a locall}� � observed soactlzwest-dipping thr�arst faarlt at the range fi�ont, possible cl�anges in,faaclt dip u�i1h dept]z beneath t1�e foothills, arrd alternative liypotheses for�active str�i�etul•es t1�at can acco3a�3�iodate dif�erential atplift of the Ir�is1�Hills r�elati7�e to the Los Osos Valley. Co�pa�•ing t[�e faulting charaeteristics feom the above descriptio�ti with obse�'ved faulting ci�aracteristies withi�� fault tcenches excavated at tiie Madonna Frootx� site, the site generally sl�ows a southwest-dipping fault tEiat is broken by discot7tinuous faults. Althougl� the Los Osos fault as mapped at the Madonna Froozaa site exliibited discontinuities (ie, Holocene-active fatil�ed areas and Quat�rna�y age �older� faulted areas (ie fault tre��ches T-4, � T-IOB), the study at the Madonna Proom site conse��vatively �•ecominended a develop�nent setbacic �•egion along the fauit. ;; 11.2 Ground Shakirt � Estimating the design ground motions at the Site depends o�i �na��y facto�s iiicluding the distance f�'om the Site to ;j known active faults; the expected ►nagnit�ide and rate of recurrence of seismic events p��oduced on such faults;the � � sou�'ce-to-site ground motion at�enuation chat•acteristics; and the Site soil profil� ehat'acte►•istics. According to � section 1b13 of tl�e 2016 CBC (CBSC, 2016), alI st�'uctu�'es and portions of si��uctures should bc designed to resist � tl�e effects of seismic loadings ca«sed by eaz-thquake ground motions in accort'dance with the ASCE 7 2010 � Mini»zuni Design Loads for� Buildings and Ot1�er Structa�j•es, hercafter �'eferred to as ASCE7-10 (ASCE, 2013). The Site soii profile classification (Site Class) can be determined by the avcrage soi] properties in the uppe�• 100 feet of the Sitc profile and the critet'ia provided in Table 20.3-1 of ASCE7-10. Spectral E�esponse acceleY•ations, peak ground acceleratioa�s, and site coeff'icierats p�'ovided in this repot�t we��e obtained using the computcr-based U.S. Seis�ic Design Map tool available fi'om the United States Geological Survey wcbsite (USGS, 2013). This progra� utilizes the methods developed in the I997, 2000, 2003, 20Q8 and 2013 ci'�'ata editions of the NEHRP Recommended Pro�isions for Seis�ic Regulations for New Buildings and Other St�'uctures in co�ijunction witl� user-inputted SiEe latitude and longitude coordinates to calculate seis�nic desig►� para�neters and response specn'a{both foj•period and disp[acement) foc soi[ profile 5ite Classes A th��ough E. Site coordinates of 35.24805 degrecs no�-th latihide and -120.b86144 de�'ees wes! longitt�dc were used in the web-based probabilistic seismic hazard anaIysis (USGS, 2013). Based on the results fi�o�n the in-sihi tests perfozmed during tl�e field investigation, the Site was defined as Site C3ass E, Soft Soil for the eastern Iower-elevations of the 5ite and Site Class C, Very I3ense Soil and Soft Rock profilc for the western upper-elevations o� the Site profile per ASCE7-10, Chapter 20, Relevant seisinic des[gn parameters obtained from the progra� a�•ea are summa�•ized in Table 2: Se[smic Desi�i Parameters. 16959 13 GeoSalut�an9,iN�. _�_ �- .� .� .��� ,�._ �.�_ ProomlVillaggio Spcci�c Plan Nrelimii�ary E�lgincering Geology Investigation April 14,2017 PrUject No. SL09734-I 'N's�i�l<� 7,: ,`i��i�s�i�es� ����si,r�r �'tw2�:���€��i��'s E—�of�Clay (lorver elev�tions} �ite �lass C—Veiy dense soillsoft ►•ock{upper elevatzor►s Seiszi�ic Dcsig�� Cnteg�3r�� Vartes U,425 g for weste�•� iypper elevatians I-�ecn���l Perinc� Desigi� 5pectral Res��aE�se Aceelei•ation, �nl 4.774 g for eastea•n lo�►ver elevations 0.854 g for western upper elevations Sl�ort-Periocl Desigri 5pec.fral Respansc ,�ccelcz•�tion, SD5 0.7G9 g for easter�� lo«°er elevations O.��k1 g�br�westei•n upper elevations Site ,�peci�c MCE Yeali G�•or�nci Accele.t��fior�, PGA��� p,:�g� � for eastern lowe�•elevations 11.3 Ground Sua•£ace Ru ture Due ta Faultin Thc Alc�uist-Priolo Ear-thquake Fault Zoa�ing Act of 4972 req►�ir'es that the Califoi•nia 5tate Geologist establish Eac�hq��alce Falilt Zo�les a��ouiad the stu�face traces of active fa��its and to isstiic appropriate �naps. The subjeci site is ��ot Iocated witl�in an Ea�-tl�qu�lce Fault Zone (Jenn�ngs, 2010} altl�ough an Earthqualce Fault 7.one is located a��peoxi�3�ately 8,000 feet northhloi•thwest of the site {see Plate 7A for location of Earthqualce k�au�t Zone in vicuaity of subject site}. 11.4 Seismically Induccd Water Waves and Floodin� Tsu�iamis and seiches are two types af wa#er waves that are ge�lerated by eat'�hqualce events. Tsunarnis are broad-wavelength ocean waves and seiches are sta�ldis�g waves within conf3ned bodies of water, typicalEy reservoirs. The �otential foa� a tsima�ni ta affect the Site is ]ow due to distance fra�n the ocean. Flooc�ing associated witl� a seisinic event is co►zsidered low due to the absence of a body of water upsiope or t11e pl'operty. 11.5 �eismicallv Xncinced Settlement and Slope Failiaa•e There is a low potential for seismically induced settleinent in tlae western u�pee ta}�ographic areas at the Site based upon the depth to Franciscan Complex units anc� densities wit�iiii the subsurface. Tl�ere is a potential fot• seismically i��duced settleinent �n the easter�i lower topograpl�ic areas at�he Site l�ased upon the deptll of the sediments a��d densities within the subsurface, however, assumiilg that the reco�nrnendations af ihe Preiiminary Soils Lngineeriilg Report are implemea�ted, the �atential fo�' seisinically iilduced settleinent a��d differe�3tiai sei�leznent at the Site improvements is considercd to be low. The potential for seisinically i�►duced slope failLu•e is considered low due to the presence of near- surface�'�'a��ciscan Corr�plex matcriai within t��e suhsurface on western t�pper clevations of tl�e property. 12A LI U�FACTION ANALYS�S In the co��te;�t of soil meclaanics, liquefactioi7 is the process that ocew's when ti�e dyn�mic loading of a sail inass causes the sl�eaY' st�•engt!} of ti�e sail �nass to rapidiy c�ecr•ease. Liquefactioia can occur in saturated cohesionless soils. 16960 a� GeaSoliut�ons,iN�. � , Froom/Villaggio Specific P(an Preiiminary Engineering C�eology It�vestigation Aprif i4,2U17 PG�ojectNo. SL0973�1-1 The most typical liquefactioii-i�id�iced failu�'es include co�isolidation of liquefied soils, surface sand boils, lateral spreading of the ground surface, bea�•ing capacity failures of st�•uchual foundatio�is, flotation of h�►t•ied st��uctures, and differential sei�le�ne�it of above-ground shuctuses. Liquef able soils �nust undergo dyna�nic loading before liquefaction occurs. G��ouzid motior► feom an ` ea�-tiiquake may induce large-amplihide cyclic revet•sals of shear shesses witiiin a soil mass. Repetiti�e � lateral and vertical loadi�ig as�d unloading usually �•esults fi'orn this p�•ocess. Tiiis p�'ocess is conside��ed to I;. �: be dynainic loading. Ir► a liquefiable soil mass, [iquefaction may occut• as a result of the dynamic Ioadi�zg caused by ground motion prodLiced by an earthqt�alce. The pf'esence of loose, poorly graded, �ine sand material that is satu�'ated by groundwater within an area that is known to be subjected to high intensity ea��thqualces and long-duratio�� ground motion are t[ie key ; factors that indicate potentially liquefiable areas and conditions that lead to liquefaction. Based on the consistency and �•elative density of the in-situ so�Es the pote�atial fo�•seismic lic�uefaction of soils at thc Site is low. 13.0 GEOLOGIC HAZARDS 'I 1 I3.1 Expansive Soils T�iE expansion potential of soils va�y fioin rnedium (ei—79) to veiy high (ei— 186). 13.2 Nafurallv �ccuR�r'rn�Asbestos Serpentinite rock was encou��tered at the site duz'ing the surface and subsu�'�ace in�estigaf:ion. Site disturbance is a�fticipated to he gceater than 1 act'e and San L«is Obispo County Ai�•Resource Board dust conhol measures are recom�nended to be i�acorporated into project plans. Rock samples were collected from four locations �where serpentinite was in outcrop. Laboi�ato�`y analysis (CARB 43 S}�•esults show that asbestos containing rocks (chiysotile} a��e present at tlie site. �ab ��esults a►•e contai�ied at the end of the report. 13.3 Radon and Other Hazardous Gases The potential for radon or other haza��dous gases is low due to tlie absence of MonteE•ey formation bed��ock and other gas pt•oduci�ig foi•�nations. 14.0 SUBSIDENCE Causes ot�significant land suhsidence in Califo�•�iia include compaction and decreased void space as a �•esuit of reduced pore pressure due to de-wateR'i��g o�• withdrawai of oil and gas; hydt•o-compaction of dry, Ioose, clayey ; soiis; and oxidation of ocganic matet'iai and subseqt�ent compaction of remaining soil�natet'iai. Assuming that the ' recornmendations of the Soils Lngineering Report a�'e implemented, the potential for subsideiice at the Site with respect to develop�nent is considered to be low. 15.0 ROCKFALL HAZARD Plate lA depicts a line demarcated as a generat extent of observed potentiai for rockfall {z•ocks ohserved lying on the sut'face) as observed durnig the site reco»naissance by the undei•signed. The main c�'iteria fo�•estahlishment of this line is presence of rocics that were generally 1-foot diaineter and composition of gene��ally seE•pentinite. Loose sua'1�ace rocks in this aEea have a potential to z'oll during a seismic event, Mitigation is offered in the �'ecommendations section of t�iis ►�epoi-t and is dependent upon type of devetop�nent proposed in this area. 16961 �5 Gen5nlutlnns,��u�. �.:��_.�,.� .._� . , ����« �'roon�/Villaggip S}�ecific Yla�� Pceliminary�,�iginccring Geology Invesfs�;ation April 14,2017 Project No.SL097�4-1 DeveIapme�it within or downslope of the potential rocicfall hazard �nay be affected. SIope gradient, t'ock size, sphericity of�'ocks, slope roug[u►ess, rock ex�osure dictate propensity af potential for rocks ta rolI. 16.0 VOLCANIC ERUPTX�N Volcanism in California is typically associated with tife Cascade Ranges Geomorpl�ic Pravince i�i not�tl�e3'n California, and fhe Basin and Range Pi•ovince on the eastern side of the Siez'�'a Nevada Mountains. Prevaiiing westerly winds would most likely rt•educe the cha�ice of asl� faIlout in the central Califoi•nia coastal a�'ea from volca��ic activity an the easte�'n side of the Sierra Nevada. Ot1�et• hazards gene��aily related to volcanis�n are �iat pe�tinent to the subject site. 17.0 ADDITI�NAL SERVICES The recom�nendatiofis contained i�f this repo�-t are based a►� excavated exploratoi•y trenches and bo�'ings and an the coiitinuity of the suh�surface conditions encountered. It is assu�ned that GeaSoh�tions, Ine, will be retained to perfarm the following se�•vices: l. Cansultation dua'ing plan developtnent. 2. Plan �'eview of final grading and drainage documeilts p�'io�•to construction. 3. Additionally, construction observation by t1�e Project Engineering GeoIogist may be necessary to �eeify suh-surface conditions duritig excavation activities. 18.Q LIMITATX�NS 1. The reco�n�nendatians contained �n this repoit are bas�d on Site reconnaissance; review of sub- st�rface data, and pai�tiy on ce�-tain plans, information, and data provided ta us. Any changes in those pla�is, information aR�d data wi11 �•ender our �'ecommendatians invalid ��nless we are commissio�ied to review tlie cha��ges and ta�nalce any necessary modifcations aild/o�'additions to � recoin�nendations. � 2. T1�is ��e ort ts issued with the ualde�'standing that it is the responsibility of tiie awnec or hislhet' � p �-epresentative to ens�►t•e that the informatian in t1�is repo�-t be incorporated into the pro�ect plans and �'eco�nmendations cozatained he�•ein be brought to tlie atte�ition of tE�e architect. The owner oi• 1�is/her representative is �'esponsible to ensure that the necessary steps are talcen to vet'ify that tlie contractoe and st�bcont�•actors comply witli z'ecommendations in the�'ield. 3. Ouc recommendations hav� been made in accordance with the principles and practices generally employed by the engineeri�lg professions. Ti�is is i�� lieu of alI other waeranties, expressed or implied, Reference is made to our Agt�ee�nent for Pt'ofessional Services, which contains additional limitations conce�•ning this project. 4. Any pe��soi1 concerned with this project who observes conditions or featu�'es of the Site a�• surrounding area tl�at aE•e differe��t fi•om those descrihed in tliis z'eport shot�ld re�a�t ihein im�nediately to this office for evaluation as part of an additional scope of worlc. Shauld additional evidence become available in the fiiture ti�at would indicate the need far additionai sh�dy, th[s �'irm should be contacted. 5. As of the p['esent date, tlfe findiilgs of this report are valid for the property shidied. With the passage of time, changes in the conditions of a prope�•ly can occua' whether they are due ta natu��al 16962 1� GeaSalut�ons ��u�. ;,,�. .� �: �::.s.�� �*;., , Froom/Villaggio Snecirc Plan Pa-elimina�y�ngi3ieering Gcolog}�[n�estigation Apri[ 14,2017 I'3•o.jectlVo. SL09734-1 processes o� to the works of man o�1 tt�is oz' adjacent p�•operties. The�•efo�•e, this ��eport should not i be eelied upo�� after a period of one (1) year without our review nor shoutd it be used oa' is it applicable for any properties other tha�� those studied. However many events such as i�oods, eaithquakes, g��adin� of the adjacent prope��ties and buildi��g and municipaI code changes could �•ender sections of this t'eport invalid in tess than 1 year. END O�'TEXT 16963 �� GeoSolutions �NC. , i REFERENC�S Califotnia Building Standards Com��ission (CBSC). (201G}. 2016 Califo�-��ia Buildi�ig Code, Caiifornia Code of `" Regulations, Title 24. Part 2, Vol. 2. California Division of Mines aud Geology, Fault E�aivation Report{FEA} 200, Los Osos Fauil Zone, Sa►� Luis Obispo County, California, Jerome Tre�znan,Jaiivary 23, 19$9. California Geological 5urvey, 2010,Fault Activity Map of Califo:'��ia. Jennings C.W, Map Sheet 6. . Dibblee, Thomas W., Jr.. Geologic Map of t1�e San Luis Obispo Qieadrangle. Dibblee Geologic Cente�• Map Numbe�•DF-129. 5anta Barbara Museu�n ofNatu��aI Histoiy: June 200�1. Dibblee, Thomas W., J�'.. Geologic Map nf the Pislno Beacl� Quadran.gle. Dibblee Geologic Ce�ltei• Map ; Number DF-212. 5anta Barbat�a Museum of Natu�•al Histot•y: June 2006. ! Eartl� Co►�sultants Iirternational, Novezz�ber 18, 201b, Report— 5oi1 Stt'atigraphic Assessments i�� Suppozt of a � i: Study to Characterize the Activiiy of 5trands of the Los Osos Fault Expased in Trenches Along the Los ;� Osos Vafley Road, in San Luis Obispo, California. �CI�eoject no. 3b13. � ;� � Federal Emerge��cy Management Agency, Flood Insur•ance Rate �11ap, 5an Luis Obispo County, Califoenia, � dated November 16, 2012, Map# 06074C133]G and 06079C1330G. � GeoSolutions, ine., June 2$, 2016, 5oils Enginee�•ing Report, F��oom / El Villaggio Specifc Plan, APN 067� 241�030, 031, San Luis Obispo at'ea of 5a��Luis Obispo County, CalifoY'nia. Project No. SL04734-I. GeoSolutions, Inc., i�� p�'ess (April 14, 2017), 5ubsurface Fault Iiivestigation and Develo��nent Setback Map, F��oom / El ViEfaggio 5pecifc Plan, APN 067�241-030, 031, San Luis Obispo area of San Luis Obispo County, California. �'�•oject No. 5L09734-2. Hall, GA., 1973, Geology of the A�'►'oyo G�•ande l5' QuadrangIe, Sa�� LLtis Obispo Caunty, Califo�•nia, CDMG Map Sheet 24. Hall, C.A.,Prio��, S.W., 1975, Gealogic Map af the Cayarcos�San Luis Obispo Regian, San Luis Obispo Couniy, Califoinia: U.S. Geological 5urvey,Miscellaneous Field 5tudies Map, MF bSb, Scale 1:24000. Hall, C.A., Et•nst, W.G., �'�•ior, S.W., a��d Wiese, J.W., 1979, Geoingic �nap of Sa» Laris C�bispo-San Si��7eon Region, California: U.S. Geological 5urvey, Misce[laneous Tnvestig�tion 5eries, Map I-1Q97, Scale 1:48,000. Lettis, W.R., and Hall, N.T., I99�1. Los Osos fault zone, 5an Luis Obispo Ca�►nty, California: i�� Altez'�xaan, I.B., McMullen, R.B., Ciuff, L.S., and 5lemmons, D.B. (edito�•s), Seismolecto��ics of the Cent�'at California Coast Range, Geological Society of Amez'ica 5pecial�'aper 292,pp. 73-102. Let�is, W.R., l�elson, K.I., WesIing, J.R., Angell, M., Hanson, K.L., and Hall, N.T., 199�1. Quaternary tlefoimatian of the 5an Luis Range, 5an Luis Obispo County, Califot'nia; in Alterman, I.B., McMullen, R.B., Cluff, L.S., and 5lemtx�ons, D.B. (editors}, 5eisznotecto�zics of the Cent�•aI CaIifarnia Coast Ranges, Geological 5ociety of Ame�'ica 5pecial Paper 242, pp. 111-132. PG&E, Jant�aiy, 2011, 5horeline Fault Zone RepoY�, 5ectio�i 3 Regional Tectonic a��d Seismic Setting, Repo�•t 16964 to#he U.S.Nuclear Regulatory Ca�ninission. PG&�, DCPP Ma�ping Praject, ReportNumbe�•: GEO.DCPP.TR,14.01, dated 6/30/2014. PG&E, 2011, Los Osos-Edna Valley, LiDAR data, Open Topog��aphy, ht��a://www.pge.ca�n/myb��siness/edusafety/syste��►worl<sldcpp/SSHAC/legacy_documen#sldatasetslindex.sh tml San Luis Obispo Comity Depai-��nent of�'lanning and Building, December•, 1949, Safet}- Elernenl, San Luis Obispo Coui�ty Geilei•al Plan. San Lriis Obispo County Departinent of Planning and Bui[ding, November 2, 1993, I.ancl U.se Elernent, Sheei 42-43. San Luis Obispo County Pla��ning and Building Departmeilt, Janua�y 2005 (updated October, 2013), County Guidelines far Engineering Geology Reports. State of CaEifornia. Depa��tment of I�ndustrial Relations. Ccrlifoa�nia Code of Regarlatrons. 2001 Edition. Title 8. Chapter�: Division of Industrial 5afety. Subchapter 4, Const�•��etion Safefy O��ders. Article b: Excavations. http:l/www.dir.ca.govltit[e81sub4.I�tml. State of California, Department of Transpo��katioYl. Standar�c� Specificcrtro��s. State of California Depat�tment of T��anspflttation Cc��tral Publication Distributioil Unit; .Tuly 1949. United Sta#es Geological Su�'vey, Geologic I-Iazards Science Center, �I.�S. Seis�a�ic De,sig�� Map,s, http:/lgeohazards.usgs.go�v/designmaps/us/appiicatio�a,pl�p website. J�E�uaiy 24, 201�. United Siates Gealogical Stu•vey. MapVietin — Geologic Maps af TI�e Nation. Interzaet Application. USGS, 26 August, 2013. <htt�:IIEZ 7�ndb.us s. =ov/tna s/Ma Viewl> Wiegers, Marlc O., 2010, Geologic Map of t[�e San Luis Obispo 7.5' Quad�•augle, 5an Luis Obispo Co�inty, Califo�•nia, California Geologic Su�•vey. Wiegers, Marlc O., 201 I, Prelitninary Geoiogic Map of the Pismo Beach 7.5' Quadrangle, San Lurs Obispo Co�znty, California, Cafifoi•nia Geologic Survey. 16965 4 � t 1 i i 1' } PLATES Plates lA, 1B, 1C - Site Enginee�ing Geologic Map Plates 1D, lE, 1 F—Fault Setback Maps Plate 2—Site Cross Sections Plate 3A, 3B -Regional Geologic Map, Hall, 1973 and Geologic Explanations Plate 4-Regionai Geofogic Map, PG&E, 2014 a►�d Geologic Expla��ations Plate SA, SB -Regional Geologic Map, Dibblee, 2006 a�id Geologic ExpIanatio��s Plate 5A, 6B—Regional Geologic Map, Weigers, 2011 � PIate 7A, 7B—Let�is &Hal[, 1994 and Geo[ogic Expianations � Plate S —Google Tmage with USGS ICMZ faulting—2016 � PIate 9--Special Studies Zone-- 1990 � � � Plate l0—LiDAR Image- 2011 � Pfate 11 —Regiot�al Fault Map, Jennings, 2010 and Explanations � � Plate 12— Supe��imposed Fa��lt Map � � Plate 13A, I3B—Historica[ Seismicity Map and Historical Seisrr►icity List P[ate 14—Landslic{e Hazards Map, San Luis Obispo Cot►nty Depaitment of BuiIding and�Ia��ning, 1999 Plate 15 —Flood instu'ance Rate Map, FEMA, 1985 and Explanation Ptate 16—Geologic Shidy Area Map and Expla��ations, San Luis Obispo County Depart�nent of Building and Planning, 1993 16966 Q �, I� ✓, � I y � ~ � �� l`.�� 'S-� � ,Y%�!� /`�`�. ��.��. 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FauN—�o�g dash whero appoximaleSy bcaled:slwn tlash who[e rnncealed Lut€ocarton is well Betlrockoul�ops(Noie:6edrocK gooUflY�s noI mapped En UelaiEJ � ^ consl�ained;tlotledwherelni2ved:UQuy�=downaE�tlarrows4�dkaterelativosenseoldisplacoment; smail���owanim�m6erindicatedipoltauAplaneexposedinoutwop � CaroagaSandslone�Pliocenr.antlAte[slocenu?}—Loose3ycansoStlatedlowelFcen�enteA, m ,,,, _...,..., Aatla3phoioEinaameni—�Ashedriharefessd�stiricl;piotrab�elaufi�,Icelonalwmmsl,vl.vegolaUon pooriy6etlded,medivm-t0�o:��se-�rainetlsandsloneandwr�jfome�ate;shelldehdsasmuch fineainent,ld=linoartlra�naqo-,his=6reak In s�apo,shb=sltle h���bench.Hachures on�opograpUka�iY as z6%ot rocR{modilied fmm H81!eI ai.,7979y downslde of a sca�p ,,, Monteioy Fom�2fi�n(mltldle and iata Miocene}—�latomaceous shafe.po�ceEaneous shale, �\\\\ Shear zone In 6edroch 8ialomile,siily sa�dslono-,antlapaline and che4y shale�modilied Irom Hall ei al.,i979} �2-0 S1drliandd'qolhedding ns PoEn�SatFormatlon(m�d6�eAticeeno�—LtgM6[ovrns�Rso�e,diaiomaceousslllslone.and tlolomi�e sEllslone Smodille6��om iia¢ef a€.,1979) F�uyF � MarinoSorraces��andline—SofidWne�ewollconsirained:tloudledot-tlashwhoreburiodorlesswell green Y constrainetl;tloiled whero-e�oded:quededwhore uncnrla�n;aHitutle of shmeline ang3e in meiers � claystoner{m�od'i�iedfro�n Hall el al."7979) ���etl rnnglamora�e,sardstone,a�sili ----�- Contatl—�ashetlt�hEreappioximalelyi090toQdolled�vhe�e6nriedand[n�ercatl r iu�f{age�nceRainj S��-e Saismxres�actiansurvayl€ne FranciscanComplex{CrelaceousorJurassiC}—inclutlas: TQ� Tfencn ' � - . -- - - � - -- � � �� f G�aywacko,shale,cherS,and melanye . i; O SP-T-S 59��p�1 }.ICl3VokdfliC l�Ck ��p.�s Exploralionpil er alaeschisi �28 Borehole—Comple�etlaspartaflong�7e�m5olsm�Program(PGSE,79687 , SeipenlinBe{dunssk?J - � a�QmU,�� Su�SLIddCR s[ra�iqfdphy antl d�liitlflE(mCICfS�of iha lop Of 6GtlI0Ck.SCe tl25c[Y1110n ol m�p I1NI5�ot , llntlittP�e�Yaied 6admck 'I ex�lanalbn oi O�alemary and 6edrock symbals � I F! Landslitle,airax indkates dEraclion of movemonS x„ Subsciipt p Intlica�es Qresence ol phniad�rings on wave�c�l plalla�m � p-v. Spring � Reliu sea sFack .. t Iw-42-b�e Localonoltlaled1as511sample 1+aniisoo Localronofradiocarbonsample 1L-te. I.xatbn of samplolor Iharmolum�nescence Anatysls DESCF�PiION OF MAP VNfTS Q6 eeachdeposil—�.Sodern6eachsnMs,uncnnsofidatetl O Eoliandeposll�Ho3ceoneandlataPieismceno�--Inclutlasu�nsolidatetladivesanddunes, ard sllgMly ta weaklycemenied inacfiv0 duno-saM on alovalee marino�errares ihal has beea stablizetl 6y vegotalbn antl soil developmen� OColWvium tHalacena a�d Pie3sloCenn��--UncoasoliUaled,p��€y saAed sand gravel,sfll,arM clay tlepos3led as a resuEl o1 Ri3lslope p�ocessos � � FavlaSandalluulaldeposlls�Hv�ah�eantlPEcisiocenc�ontlfllerenllateJ—�3��nsolidalnd co663e�pa�le g�avel,sand,s�il.ard clay 4� StraamleriacetleposiS(Holo�ne�ndialeP]e[slocrose�—�ndHferam€a�ed Oak Knoll CieeN y� � Lr 1 aclNa '::�Ui,�:; 2.5-3.8 Ha - Vr� hlstodcaE ;;;C�!s, 5.51o7,9ka -- "' �� 4+ 2,25±9.75kx e'6 LalePoeislacenemeailyHoloce�e ��qe 2?5r0.75ka r 1 Estuaeinetlepqsit{Plnislocene]—Silvyciaylniei6edCedwii��IninfayorsollEne�toco��sey�ainntl � `�� � sa�d;dadcgr�y;coniain5atu�anlCharrnai,wootl,anddisseminatedorqaniemaledal � Oldera�����mia��dielolataPlelslncene)—UnconsalldateU,weaklytomoderateyst�aU�3ed, motlarelely lo paody sotled giavof,santl,si3t,aM clay deposilotl in puvial channels and alfuvlal fans oveiying marine wavs-cuf pialtorms:p[usenlH�nde�qoing dissection r� lAafinadeposN{mldd�eto7aS¢F§elslxene�--U�wonso�ide�,tp�Ideis,mL6lesantlsand,wall- U m modeiaiery sariad clasts are typlcal3y sub[ounded la�ounded antl canslsl ol 30rass�ophiolite, franciusn Comyex�nd 7Annte�ny lithologies I?\. \UL�AL C£�°`„ G, .�, ,.�pG`\ i �� Diiks 1UJh?hLN ��t} � � Z�p 241n � d CGn�ill=l��, � E4dCaISS@G�55T 71 GL-Ol.C1C' �_'f p�r sr4r��Of- v 4\f'. GeoSolutions, Inc. PLATE Z2o x€gh st��eer GEOLOGIC EXPLANATIONS �B San Luis 06ispo,Ca[ifo�•nia 9340I PR07�CT NO: ($OS)543-8539 fax:(805)543-2171 FROOMIEI VILLAGGIO SP�CIP'IC PLi1N SAN LUTS OBISPO AREA,CALIPORNIA SL09734-1 16982 S ite �,f _ �� �L .d ��,' ;s: . .ti '{�J1 I �\ � _ ' � :i ' f�r � - � - ����f �V� f ��'� �� ,��' 9 } -�2.r� ���!' ` h r's`e' .� � . , �� �\ Fy' i: ���'V�i r �� - -:-. .5 . 1;,- t ': �` �//' " '1�r } .'�`��.�.y , �.� � * , '4� . _ y�'�.�` ` r+'E�' ��' �7 I �7= .,��:��•'�++�� ,ir ,� ���f �,� . � �e� { � ., � 4 �r� , r; y�,r - I -r`� .z i- '.ri , �A �`��1 �N� I . ' � -�� �_ ���'�/ri�'� I . � � :r. .f'�.t' '"'�� �;�!�'� '��� � _ �,',,�� y' �j �s ; '�rt i� h .,, ��L.. ,rf' ��,_ f A � � �L�'3�l c� -�. �"r°�� `./,5? , �.,,. , � �y•� ll?�+ �jt _ �� � ''� �--v ,,�•.� ��f y e� r'1� Location of Las Osos ,ti -, !' a,, fault fi•o�n USGS — ��. . ' ;,, � �'�� � ` t r '� ��„ �_ " •,'�, KMZ files, Late �• �,,t' �<,:�,. `A _�' ' ,.,.��; ,��"'�� _ Quateznary age �"► '-��: l .. ;;,: ! _ ,�°�' �7�'i�� "�... '��,. .3.r f, '4 j{ I�� p� F /��-.l ';� �� 'f� . . 1 � � � �' �: pfX�n�k��C('.�1 � � �1 0. d�a� .�:a LqS..- Go���,���.t� e a r t h ���t zoao � mete rs 700 ����-_c;1;a`. GJ��U J_.. . .`���,�. 4i r�` p dutlSk��2M1j�L-� Ua ti � �a CGri11FtEu iS4l��R8C�G45'[ Cti.�L 2'�i',i sr �.: qrk �F G�,\� ,. GOOGLE YMAGE WITH USGS KMZ FAULTING P�"��� GeoSolutions, Inc. s 220 Iligh Street Date:2D 1G Sa��Luis Obispo,Caiifornia 93�01 FRpOMIEI VILLAGGIO SPF.C[F[C PLAN PR01�CT N0: {805)543-8539 fax: (805}543-2171 SAN LUIS O13tSf'a AIZEA, CALIFORI�IIr1 SL09734-1 16983 - MAP @?CP[.ANATION -' � Ac4fua Faults - t9os Faults cortsidared to have 6een active dvring Holocene time&nd#o have a �,c� ra€&tively,high potentia€for svrface[upFura:solid line where acc�retelylacatad, ��� long desh whare appfoximateSy foceted,short dash whare inferred, dotted " - \��X�I ` /t��l `-' l� '(I ' t'. � '1�J� .,-- whete cancealed;que 7`�ndica�es addstional�uncerteint.Evidenca of histor- ' �C..I /,� �! �1� l t . 4 / � ry l ! 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'"{�^ . ,r i �I� �� f� �li,•� r, �.. � + '.I- ,}d 3-. R� '.�-t��� � % �/� 1' � '%��� i . r � \ fi � � -�a , psXA{�,�T�s /�1 F�` Yl#R �A'!4"��'.iy `'Y�l.�rf��f ��' �/ . e%1 ' r�� •�'. ���l� ��` 1,_ _ _ , ./ ."-F�pyr�`'l: d� r %';r � �r, t. 1, § � i' r i ���� ���u� /i!', � � . �. ' r '1)a g„� y r + .S�pi,r�,'�b��' �` �t��', � �� � .,, r , l-I,/.�, _ '� ,��� , n •� � '�t � r � f r, / �.f J 1 . �rf ��s t � �'� _ .1}S.I:°'' I [,�fll'F 1 +�,3, 'POi� ' f E;����Ul�p' j 'f{`F1'� , r r� , � ..fx/�r71a;.•rS �i .� i •1A {Py �.� \ �f j r .y. �y Tf f.�l j ..r � �� � - �l',i . .. ��� �PIGENTER MAP LEGEND � � �'�� ,�,F ' ' �"'' ,., . ��1 Podai 1800� 18G9� 1932• � � � '�,�-�� ]80B 7g31 14fl9 }7o i � � �'�� ' � : �� /� • I J- j ` ��!A'. J. ^ � � � �, '.id, .', Ai p 0.5-6.A � li�: �� �� � r� ea.�.� � • r � � �� C 5.5•6.9 • � • 7zo' . u,6•S.A • � r }I�sloikcalFaulllnn • !Iclocono F�ull�nU i IKsl�vnrys(f�fajOtf � �� . Hiflhv,�ys(��1ln�} - Lukn;; i0 O YO 20 30 AO yD 60 70 6UMIles � Llksl Ivla d:gds o1!d`G G.5 10 0 _ 10 ZO 30 40 50 60 70 �0 90 1pp KHamalers a.�Il�t�uako yb.r - — DEM modifieii from C1.S.G.S.digilnl filc. T. TOPPOZADA, D BR_ANUM, M PETERSEN, C HALLSTROM, C. CRAMER, M. REICHLE, 2000 GeaSo�utions Inc. HISTOR�CA.L SE�SMYCITY MAP �L``T� ��n 220 lligh Street San Luis Obispa,Ca[ifornia 93�}OI FROOMBI VILLAGGIO SI'F,CIFIC PLAN PRQJECT N0: (SOS)543-8539 fax: (805)5�43-2I71 SAN LLlI�OBISPO AR_CA,CALIFORNIA SL09734-1 16988 Significant Earthqual�es That May Have Affected the Site in the Last 200 Years DAT� TIME(GMT} LATITUDF LONGITUDE llAT� T'IM�(GM.T} LATITUD� LONGI'I'ITDE Year rr►t�a da 1��• (N) {W} MAG LOCATION year mtta da hr �N� w� MAG LOCAT[ON t812 12 2] 19:00 34 12A4 119 5�4.00 7.0 Santa Barba��a Channei 1941 7 1 07;50 3�E 22.00 119 35.00 5.9 Ca�•�ettte�•ia l 830 ? ? 35 3 120 G 5.0 3an Luis Obispa area(?) 195I 7 29 36 58 121 18 5.0 So�theast of Yvlulberry � 1853 2 1 35 b [21 I 5.0 San Siineon area (?) 1952 7 21 11:52 35 0. 1l9 1.0� 7.7 Ke�-n County eat�thquaice � 1857 1 9 16:00 35 42.00 120 18.00 8.25 Great Fort Tejon ear•thqualce 1952 1 l 22 Q7:46 35 44.00 121 12.00 6.0 B�yson 18ti6 7 15 d6:30 37 30A0 121 18.00 6.0 W. San 3oaquin VaIley i955 i l 02 35 96 120 92 5.1 Sa�i Ardo area � i881 2 2 00:11 36 0. 120 30.00 5.75 Parkfield 1956 11 16 35 95 120 47 S.0 Southwest of Coalinga 1881 4 10 10:40 37 24.00 l21 2�,00 b.0 W. San doaquin Valtey 1960 I 20 36 78 121 43 S.0 Sautl� ofHoilister I$S2 3 6 21:45 36 54 I21 I2. 5.75 Hollister 1966 6 28 04;2b 36 0. I20 30.00 6.0 Parkfield 1883 9 5 1230 34 12.00 119 54.00 6.25 Santa Barbara Cl�aiinel 196G 6 28 120 50 5".1 Parl�fieId Sequence 1885 3 3] 3b 7 121 3 5,5 San Andreas Fault(?} 1966 6 28 35 95 l20 50 5.5 Paz'Icfield Sequence 1885 4 2 36 8 12 i 4 5.4 San I�ndreas Fauit(?) 1970 9 12 34 27 117 54 5.4 �,ytle Creek A��ca 1885 4 12 3G 4 12I 0 6.2 San And�•eas Pault(?} 197f 2 9 14:00 34 25.06 1 i 8 24.00 6.5 San Fei•zaando 1892 4 2] 17:�3 3& 3fl.00 t2i 54.00 6.25 Winters I972 2 24 3b 58 I21 21 5.0 Southesst oFHoliister 1892 I I 13 3b 8 121 5 5.5 San Andreas Fault(?) 1980 5 29 34 94 l20 78 2.I Orcutt Frontal Fault I892 11 13 12;45 36 48.00 121 30.00 5.75 Hallister 1981 9 4 15:50 33 40.00 119 7.00 S,9 N, of Sa��ta Barbara Island i897 b 20 20:14 37 0. I21 30.00 6.25 Gilray 19&2 10 25 3b 32 120 52 5.4 New Idria a��ea I899 7 22 34 2 117 4 5.5 San And��eas Fault(?) I983 S 2 23:42 36 14.00 I20 19.00 6.5 Coalznga 1899 7 22 34 3 1 I7 5 b.5 San AndY•eas Fault{?) 1983 7 22 00:23 3b I4.40 120 25.00 5.7 Coaiinga 1901 3 3 07:45 3b 0. 120 30.00 6.� Parkfield I983 8 29 35 84 12I 34 5.4 San Siineoz�area I90I 3 3 36 0 120 S 5.5 Parkfield Area 1984 I 23 36 35 121 91 5.2 Point Sur area 1902 7 28 34 7S i20 33 5.4 Los Alatnos area 1984 4 24 2 L•15 37 19.a0 121 39.0� 6.1 Morgan I-Iill i902 12 12 34 76 120 37 S.0 Los Ala�nos area I985 8 4 32:10 36 $.00 12D 10.00 5.9 NorEh Kettieinan Hi3ls 1906 4 18 13:12 37 42A0 IZZ 30.00 8.25 Great 1906 eartliquake 1989 10 18 00:04 37 2,19 121 52.98 7.1 Lo�na Prieta 1947 9 20 34 2 117 1 b.0 San Andreas FauIt(?} 2Q03 12 22 19:16 35 41.98 I2l 5.84 6.5 San Si��eon 19I0 3 ll 06:52 36 54.00 121 48.00 5.8 Watsonville 2�04 09 28 IO:IS 35 8.15 120 3.74 6.0 Pai'k�eld 1910 12 31 36 8 l21 4 5.0 Hollister Area 19�3 10 20 35 12 120 58 5.0 ,�I�'oy0 C`iYaIiC�B al'ea S:1MiscT)raws�egslGeologyllocaliargeFaults.doc 1915 � 20 34 73 120 23 5.8 Las Alamos area 191b 8 6 3b 7 l21 3 S.5 Paicznes at•ea 1916 10 23 02:44 34 54.00 1l 8 54.�0 53 Tejon Pass region I916 ]0 23 34 6 118 9 6.0 Tejon Pass Area 191b 10 23 34 7 1 I9 0 5.5 'I'ejon Pass Area 1916 12 1 35 18 120 73 5.0 Aviia area 19I7 7 9 35 25 12Q 48 5.0 I.opez Canyon area 1919 2 16 35 0 I 19 0 SA Tejon Pass Area 1922 3 IO 11:21 6 0. 120 30.00 63 Park�efd 1922 3 l0 35 75 120 25 G.5 Cholame Valle Area 1922 8 18 35 75 l20 3 SA Chola�ne Vailey Az�ea 1925 6 29 14:42 34 18.00 1]9 48.00 6.3 Santa�arbaca �,��'��>,.�„ �'�C!f�'1P:CiE:C���,.,,, I92b 7 25 3G 6 I2� 8 5.0 Idria area $�C� ' ` 1926 12 27 36 2 120 3 5.0 Coalinga area ������'' ��; � 1927 11 4 13:5� 34 42.00 I20 48.00 7.3 SW ofLo�n oc �� ti �Js�h4�f� �' 7, [)�ltd IC� �.�1 1932 2 2b 3b 0 121 0 SA San Ardo area �-� a 21ti� 1934 6 8 04:47 36 0 120 30.00 6,0 Parkfieid c�i_ CC��ti1Ft��� � 1934 6 5 35 80 120 33 5.4 Parkfaeld Area , �,��,}��yG�[�tNt� �; I93A 6 8 35 80 120 33 6.0 Parkfield Area a ���Ot"4G+5� ��;Fr � � ' 1934 I2 24 35 93 I20 48 5,0 Pa�-kfield Area �°'�`�)� '� � 5� �-?�'' 1939 6 24 36 80 121 45 5.5 Hollister Atea tr�"w r�~ �� �'�`������ 1939 9 21 34 &7 118 93 5.2 Cudd Valle Az�ea � 1939 12 28 35 80 120 33 5.0 Pa�•kfield Area GeoSolutions, Inc. HISTORICAL SEISMCITY LIST PLATE 220 I ligh Street I313 San Luis Obispo,California 934D1 FROOMIE,I VILLAGGIO SP�CIFIC PL.AN pROJE�.�,�1`O: San Lu"ss Qbispo County Departn�cnt of Planning and Building,Dccember 1999)5afery Eleuient (805}543-8539 fax:(A05)543-2t71 SAN LUIS 013ISP0 AREA,CALIFORNIA SI.0973,4�1 � �'``��-� � � � �AN � L I � �BI SP� _,.� �.� � , {� � �-� ,, . : ., �� ,� ���� �- �� ,� ,�� � �� �� � � � , _ � � , ___ ��_� .,,, r,: � � SITE � �`� �. .�;� � � �� _ `�� '� � - ,•' ,�*' \ � � � .� . � 1 f .r" �! N i �_ - +�f � � 11 E r •, SCALE" 5000' S 0' SQ00' —'—' County 6oundary �'�" City Boundaries l�ighways Ri�ers,Lakes,and Streams LANqSLIpE P4TENTIAL � Very Htgh ExisEinp Mapped Landsiida (flls,fl[sa) High Potentiat Frenclscan and Other Potentlally Unetable Rocks{KJfine,KJtmv, KJt,KJFg,Tm,s,7r,KJs,K1 andlor Slope Gradient> SOqo r�.—�: Moderate PoteMial `�~� Formatians Known to Hava Localized Areas of InsEability{QTp,Ka,K} andlor Slope Gradient> 209'0 p���� .C'�O �' Low Potential y`�� � � {��,�� Slopa Gradient<20% �u �, Q yoa�jy 1��t��� u S� No Landslide DaEa � ;ys�.24Y a GCItlYr1S�S� ' CSlfi14�CC 4S,� ^T`! GEOL�' rn Sj.�r�oF ��'�"\<o.: LANDSLIDE HAZARDS MAP p�A.�.� G-eoSolutions, Inc. cot�TY o�sa�LtJis oBisPa nE�At��•MENT or i4 2201-[igh Street I3lTILDING AND P[,ANNING, i999 Sas�Luis Obispo,Califoinia 9344�1 FROaMIEI VILLAGGIO SYFC7HTC PLAN PRO.iF.C`I'NO: (SOS}543-8539 fax:(805)543-2171 SAN LUIS OBfSPO AREA,CALIFOR�lIA SL09734-1 16990 - , „ - . ... �`" •' IVJ�d�ll ..;:+i::;� ::ti t�i�, � �p� � . :y : , . ,. zori�a F�, ''s:'_ : f Z�� MAP SCALE 1"=50U' � .5�3�..� .. 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Pl�oto Log of Trench T-2B Na��h Wail- Lattis Cons��ltants International, Inc. Photo Log of Ti•ench T-2A Sou�11 Wall -Lettis Consultants International, Inc. USGS Design Maps Su�nmary Repart 16993 i ' l3 IN� I1�G �: � � ° ��:� � ;� Boru�rG Nc�. �A1 E 220 High St�•eet�, San �.��is Obis��o, CA 93�E01 _ 1021 West Tanaa Lane, Stfite 105 .�OT3 NO, 5�,��']3�-� �''. S�nta Maria, C�1 9345� � PRO.CECT INPORMA'tION T]RILLING lNI'ORMATION PR0IBCT: Madonna � T'�'aom Rancka URILL RTG: 11'lobile B�24 ❑RILLINCT�,OCATION;5ee Figure 2,5ite Plan J-IOLE D�AMETER: 6 Iyaches DnTE llR1LLED: May 18,20IC SnMPL]NG METHOD: �PT and Cr� LOGGED BY: GTV HOT�E ELEVATION: I`Iot ltecorded � Deptl� of G�•ou�idwater: Not�ncoun�ered Bo��ing Te��inin�ted At;�0,0 I'ee� Page 1 of 5 a � y � �. ,� �. � q z u �� � o " � � w SO]L DESCRCPTCOt� U ,v '� z Z' � �., �' j O�= � U .� Q ° w ry `� o ,� � � �' � � ;� � � o � � � v v� �' � � � Q �C �w � ,,C � � s o �~ c.> � �W F-. z � u� �. � zz 4 w � � � � � v o w ° 4 w� "° �a W U �`U � D , - --- .—_. -- - CLAYEY SAND:very dark grayisli brown,dry CH �� -� �� A �8.7 IU7 79.6 31 -2 siiff \ ` g["I' 6 9 � �� -'� CH I SANDY CLAY;dark brown,diy -� �� , . . , �: \ 5 � � CA 8 8 ]10 sFif'f� �_ 6 . \_. -7 . \ _S . . stiff � S�"�, 9 9 '- _� . . �; � i; i; — n — i! -]D �II -l2— -13 -1�3 -I5 -16— -17 -18 -19 1699 -20 - --- --- _ . ___.._,__. ---- -_.._..._T --_. � � i � �[� I� G � � � �> �� 220 IIigh Street, San Luis Obis�o, CA 93�}0 i �OR�NG NO. �A2 1021 West r['arx�a La€ie, Suite 105 Jo�3 NO. ��flg734A1 Santa Ma�•ia, CA 93454 P.ROJECT INFORMATION DRTLLING INFORMA'I'ION PROJECT: Mado�ina- I`room Rai�cii DRILL ItIG: IViobile B-24 DRILLING LOCATTON:See I`igure 2,Site�laai HOLE DIAME'I'FR: 6��flches DAT�DRTLL,�,D: May l9,2Q16 SAMPLING METHOD: S�''1 LOGGED BY: GTV HOLE ELEVA`I'TON: Nat Reco�•ded � 1�epth of C'�roundw�ter: 4.0 I+eet Boi'ing Tcr�ninated At:4G.0 I'eet Page 2 af 5 � � � � �. � � � � � � 3� � p � � � � a '� � o � �- u � 50II.D�SCRIPT]QN 0 ti --. � -1 O � � � r% � �` � � � � � � y � � � � w � � �� �� d � U S p C�ry U �'o � � Z � �� �� � p � ��'-1 � � � v. U U � W � �'U � 0 ---� --..__._., -- — — --- CLAYEY SA?�FD:vcry darl<grayish Urown,clrp CH . . . . . 1 `�\ �—� "� CH SANDY CLAY:clar]<bro���n,d�y � . �3_. 1 \ ;i firzn � • � • SPT 5. 7 ' _q � \ 5 . . . � "6� Cl-3 SANUY CLAY:dark olive Urowst,very moist - . „�� \ �\� _g stifF �" �W 5P�1' 8 8 -9 . . . . � � _�p ---�— CH _ � SnNDY CLAY:Ulacic,��ery mossf ' ' " ' i -I1 � . � _12 \ -13 \ '�, \ w�� stiff . . . . �p'1• 16 15 I� �� �l �15 �� -16 ' SA?�FDY CI.AY:darlc olive bro�vn,���ith gravel, C4� � _�� coarse grained � � 13 �W stiFF . . . ]4 \ SY"I� 5 4 ^ -2U \ -2.1 \ W� 1699 1 -22 .�_ 'ii '4 _�3-- _\ — # � g � ��� � � ,� , �`^ 1 ' � � ,� 22Q IIigli St��eet, San L��is Obis�o, Cf1 934�1 I30RINC'r NO (cont).��� 1021 West T�n7a La�ie, S��itc 1D5 JOB N�. ��JQ9'�34-t Sant�a IVlat�ia, CA 93454 � �epth of Groundwater; 4.D Teet Boring Tez•�iainatecl At: �#6.0 l�eet Page 3 of 5 � � � q o � � z [� � `�' � '� ai�, v � � a � � '�� �� �� H FY` �n O �n n, � SOIL DE3CItlP1't01� � O � 3 --, ,ryo�� � �.�` �'�'' �C w U ,� � h tx " O � U ,�, yW, � 4 Q r i �'W � °< DC � +-�� W� ti`b Q O O �� � �r, ,qu1 ry 4 G U q Z = ._\ 2�4 . . \ 25 CH SANDY CLAY:tlarl<yeilowisl�Urowti,saturatecl ' ' ' _2g \ r �ery stii�f _Z� \ _2 g \� 29� - 5PT 21 i6 \ 30 . . . . —�— -31 � ' \T _32 . . 33 �— -3h �� 3 5 � \W" , -36 �-- -37 \` -3 8 _\ 39 . . _�� 40 . . . \ _q� . . \ -�42 . . -43 \ — .hg--- � -�5 very sficicy \ _q6 FRANC4SC:At�f COA�SI'L��:ser�entiz�ite& mel�inge,meta volca2�ic,very�veailiered 5PT 5011" 47 ..--_.__��.__.__�_�__ -48 169 6 -49 -50 - ----___--- -- —.__...�___ � ���� ��� � ; 1 , � ;��:,��--..: Bou�G No. ��� 220 Higl� Street, Sai� L�i�s Obispo, CA 93�}0� 1021 West Tama Lai1e, Suite 105 JQB N�. ��,�973��I Santa Nlaria, CA 93454 PROJECT INFORMATION DRTLLING 1NFOlZMA"1'ION PR07ECT: Maclo�ina -I�room Ra�ich DRILL RIG: �ioVile�-24 DRILLING LOCATION:Sec Figi��•e 2,Site Pla�i HOla�DiAME'�'�R: 6 I��ct�es DATE DRILLED: May 18,201( SAMPLING METHOD; SPT�nd CA LOGG�D 8Y: G'rV HOLE ELEVATION: Not l���oi�ded � Deptla of G��ound�uater: 1,S.�'eet Borf�ig Tcnninaled At:10.0 Fee� Page 4 of 5 � -�--- a � � a� � �. o � � 3 0 ' q z � � � sol�D�scru�Tiorr o � ,� �,� o � � � � �w z � � Q � ° '� 3 `' � � � � � � z �w w`� d >C t' h ° � � � '� � o q � q �� � �w ,� i-~7 � � � �ti-- Q V �j �* k`� ..,�., 0 ___— --- FAT'CLAY:veiy da��lc grayis[i Uro�n,dry �H -� B l8G 94.7 �43 _2 firtn SPT d C -3 CH . 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Sh'cA�i�Depuskls-(Q�)-Iloloccac - -" YyUI�.�.` - � . . . . . .. - - � . . � Collu��iurn-(Qe)�13olurens� ' � { ,} , r5.fluvitiu�-(Qiilj-Ylcixtocenc �o'" I � �I�'°�I 1�r,nnciscan Con�plcs-(ICJFou,f�„,fs,mv)-Cret�ccnps tn Jarassic � � melangr,grereacke 5aridsfione,scrpent��'stq�uetnvolc�nic 1 i �-L'anto-Eci uchvecn uniis f � � 7jf_ 1'nult n�fEi arx•ait�s sliotiying movci��enf tlirtctiou � . daslicd�riacre slocarc� � , �a' Calahics ' � ,, l:cli6les�nd grm•els coa��5c sand . �C l�ractuR�es � 53 S Caliclie `.CeoSu3t�fitins,Inc. , T���C�� ���� .22R 13igh Street {805)543-$539 ra�� Snn�uis Obispo,Cslift�rui,z 93401 info�i,)geosolutio�3s.tief 17015 f GeoSolutioins,Ync. ��YX.,S REPQRT (805�.5�3-8539 P��ajecc: Madonua Froocn Ranct� Date 1'ested: 7itne 3,2016 Client: Project#: SI.fl9734-1 Sam le: �l De th: 1.0 Faoi �.ab#: 1651b Location: 13-I S�n�lellate: Ma 1$,20I6 Sarnpied By: Gr'VI'�'C Soi!Cla�ssification I�aboratoryMaximum�e�isity ASTNF D2487,I�2488 l�5TIv1Il1S5.'1 TZesult: Very Darlc Grnyist�I3ro�vn S�u1dy Fat ,� CI.AY � 1;2 S�ecific�tio�3: CI-I 5icve.��3aiysis z -- — ASTIvI D422 � 1,D � Sievc Pereei�t Project , � 0.& Si�e Passing S ecifications ! � 3" � � _ 2�� li F 0;b. 1 i/2<� I � ` � .0.4 _...__ ____ __.- _ . . ---�- -------� ]" ; ❑ - 314" i No.4 43 � 0.2 --- — —-------- �--- --- --�-- No.8 90 � ` No, 16 89 ' O.D I�o.3Q 87 i D.0 0.2 D.4 D.6 D.8 1.D 1,Z No.SO 84 ; Vuater Content,% No. 100 82 No.20D 79.6 ` 5and I: uivalenf CaI 217 � _ . , l S� 2 '; IVlold ID nla Mo1d Daamerei•;.iris. �,00 3 ': No.of La ei�s. ` 5 ' Wei lit of Ramriaer,lUs. I(}.QO 4 ' ` No.ofBlows _ 25 ; �'lasficiEy I��dex ASTM D4318 Li uid�.irnif: 54 �stimated S ec�c�ravi for 106%Satut'atian Cu���e— PlasticL'unit: 23 Tria1# _ 1 - 2 '3 4 T'IlsticiCy��dex: 31 Wafe��.Co3iterit:' Expansios�Index D� Densi : ASTM D4829 M�imum.I7iyD.e.nsity,`�icf: �x�?a�zsion T�ldex: �0'� Optimum W�fer Cantent,°/a: �x�ansiof�Potential: Iligli ' , Initial SaCur�tion,%: S� lV�oisEu�'e-T}ensity AS7'�1�I D2937,Moistnrc Co�itetit AST11�I D22IG Svn le De th(ft} Watei�Content(°/o} Dr T�ensity(�c� Relative]7ensi Sam le bescri tion B-1 2.5 3 S.5 I.�as'lc Olive Gra Sanci Gt,ASr' 13-2 2.5 27.� llarlc Olive Gra Sand�CLAIT Repoat�3y: lLaror�Eicl�man Sl 17016 � i ;Geo�a�utions;Imc. SDILS R�PORT {S05)5�f3-8539 Project: 3vladonna Froom Ra�tch Date Tested: June 8,201 G Cl'zenL: Project#: SL0973�4-1 Sam le: B De�th: 1.0 Poot L,ab#: 1G51G Location: I3-3 Sam�le Date: Ma 18,2flI6 Sampled]3y: CrVI'TCr Soil Ciassifcation Laboratoxy.MaximumDensity A57'M D2487,D2�1$8 AS'i'MDi557 Resvlt: Dar�C Gray Fat CL�IY � � 1 z �---�------- ; .-----.;..T. -i--- -- Specification: ��I i- i I J __ ; , � SieWeAE�a[yszs 14 � --._._ . ! L .:� _._._.._ . _____ � --- �.. .__- - E1STM D�122 ;- � � € Sieve Percent I'coject � � � � � ' u D.S . _._.._ I . _._ _ . . . ..... ......._ ---- _ __. .. ' I Size Passing S ccifications a � � � �` � � } � —I i 2 '� D 6 E------__- ' �- _�T�__. ._.� ' � I ; , 1 1/2" n D.4 ; --�_._ ` - �__..__.. _ �_ __._._�.I�---- -- _ __i 1�� i� � I ! ,�I If .. ' I � . f � 1 _ 3/�1 D.2 -' ---- . I -- l__.__ !__ ._ '___ _,......._.:. ----- -� No.4 100 � �;.���._ __ � - ' i � ! ` � f No.8 ]00 a.a -s--:—_;� ,—,�--�_:��,� �-; No. ]G 100 o.a o.z o.a a6 a,s s.o s.z No.3D 99 No.50 98 Water Content,% r�o. �aa 96 No.aao �L�.� ':Saud T+u uivalent Ca1217 .. �—�— ---.-.-.--- ----- ` 1 S�`; 2 i 1Vlold]D n/a `` Mo1d Diameter,ins. 4.00 3 'No:nfLa ers 5 ': -: Wei ht ofltammer,Ibs, 10.00 � No,afBlows 25 . ��05{ICIfY�El(�L:A . � . . . ASTNI D�I318 � � Li uid Li�nit: $4 L�stir�ated S eci�ic Gravity f4r 100%Satiu�ation Cur�e= 1'laslic Linlit: 36 'i'rial# 1 2 3 4 Plasticity Jndex: �E8 Watez Content: �.�p��Esian Inde. Dry Density: AST1v1 D4829 Maximum Dry Density,pcf; Fxpans�on Index: 18G Optimu[n Water ConYent°/o: Fxpansion PotentiaL• �Very Hig13 Initial Sat�a�•ation,%; 50 ' Moisture-�e�isi ASTM D2937,Moist�n•e Content ASTM I�2216 Sam Ie De th(ft) Waiez�Coaitent(%) Dry Density{ cf} Relative Densit 5am 1e Desc�-i t[on Re ort By: �,ac•oA��icl�znan 13 2 17017 i GeoS.o.lutians;Inc. .: ��ILS ItEPORT (805) 543-8539. _ Project: Mado�a:aaF��ooniRanch J�ate TesYed: 7une 9,2�16 Clie4�t: Pz•oject#: SL09734-1 S�un le: C De th: 2A�eei I,ab#: 16516 Location: T-2 San� Ie Date: 1vla 18,20I6 Sa€npleci]3y. C'rVII'G 5oi1 Classificat€on `T;aboi�atory M�xirr�urri Density AST���24$7,�2�88 A.STM D1557 Result: Du�k Rec�dish Brown 5ac�dy Fat CLt1,�' !` _ - 1.2 E ......-�-----� � ------ � � �___...;_. � � � __�, ; S��ecification: CII � `. E I � € SEeve Anal sis � ' y I,a .�...__ -- -- -___.3.__._. - - - - .,. . ..... ----� ASTM D422 �� i � i Sieve Percent P��oject .¢ �� �----_..... --�— � o.s �__...----- -- - . . ... �.. _ i - _, ; 5ize Passin S ecificatious I � �� � I E �� � i 3 'C a.6 i � ; � -r—� 2�r o i ' � � , . i 1�2�� � 0.4 ' _ t__.__-------------�-.._.------ —_.� -----_..--- _ _------ � �ei p i I E , i � I � ' ' : �- � � 3/4" 4.2 _. ..,..- -- - -- -=-----�...... _---- _ �_ ....,.._�.--_..._. .---- � ;_ I�To.B � � ! � �-} 0.4 -�-`-'---_, _-_,__�-��,_.�--� --- -- ��_' I�o. 16 0,0 0.2 0.4 0.6 0.8 1,0 1.2 No.30 No,50 Water Content,% Na J 00 Na:2Q0 ':.::. :�and� uivalezit Ca127 7 _.�_ _..�_ �----- --�..�_ ' � . SE : 2 Mold ID n/a Mold Diameter,ins. 4.00 3 No,o£La e��s 5 �Vei ht of.Rawmer,Ibs. 10.00 . q `.; No.of Blaws 25 1'l�sticity Iracicx _ AS'TIvI I]4318 Li ttid Limit: GS �stirnated S ec�c Gravi fo�100°/a S�t�atian Curve- Plastic�,imit: 23 Triai# ' 1 2 3: 4 Plasficity Index: 42 Wafer Coi�tent: �;x��a�asion Ie►ciex D�y Densi : ASTM D4829 Maxintu[[a Dry Aezisity,pc#: �,xp��sion Index: 79 Optixnuirz�VVatee Co��tent,%, Exp�i�sion Potential: Mediwn Iz�itial Sat��i�afio�i,°/a: 50 Maisfu��c-Density AS".i'M Ia2937,Moisturc Content ASTM D2216 5am le De th(f�) Water Coa�tent(%) Dz Densi ( c� Itelative Densi Sa�i�le bescri tio�i Re�att B : 11 aro�i F_ici�nan �3 3 17018 C��d��LIDA�Ti�I�REPORT �OS 543-8539 ` Geo�oXutions,I�c. �. ) F D2435-11 ' � � Pa�oject: Mac[o��i�a Froom Ranch Datc Tested: 6/7/2016 Client: I'ro'ect#: SL0973�-1 j; Sam le: �3-J a 5' Tae th: 5.0 keet La��t: 16516 Location: B-i Sam ie D�te: 5/18/2016 Material: Very Daz']c Grlyish�z•o��r�i Sandy CLAY Samplec�By: GVITG 0.00 --�� -- -- - � - _ : _..� W ; - _ _._ . ; ._......_ ._..___— I ..._ 7 2.V V f f � _..._ I I .._�— I � —.... _ -'— -- ' -- s. �.ao . _ __.. _ - _ - -- --- _ �.00 - �� ___ _ -. , � s.00 - , , __ .� _ _ _-_- _ _._ � __ � - - -- ; _ ._ _ - � _ .._ _�____ , � -�- _ _ - � to.oa - _ _ _ __ 1z.ao I___ _ -- -- - - - -� -- � J� � _ _ _� _ _ __ �� , � ----- _ _- -- - � ._ �_ _____. _ : 14.ao - � , --- - ______ ___.. , _ �- __ _.. __ .�_ 16.00 � . _�_E � � �... --- -- - � _ I , I ,��� _�.. J 18.00 � _ ___ � --- --_ _ -_ --- --- �� _._ _ � � _. �__ � _.. ; - --- ____ — __ .' ,� zo.00 - - _---- -------_� ;� x �a 100 lDDO l000a �� Log of Pze�suz�e � 1 _..._....._....-. _.�-' ._-_.,...r _.--.__..... ! ._._. _.,.. _.,,_.__.._........_ ,r..- ! A����tiecl Pressure(E}sf} % Stt�ait� Compz�essio�l Index, Cc ! 25D 0.38 0.165 S00 2.99 Recoml�ression Index, Cr ' 1000 6.55 0.017 � 2000 10.12 � �1000 14.11 � 8000 18.35 � 2000 I732 500 I5.56 RaporC By: Aaroia�icln�na« k� 4 17019 � � I�IREC'�'SHEARTEST �eoSolutions,Tnc ' ;.{$05)543-8539. � SUMMA,RY�LPOR7C��( }, � �� � : ,., ' ASTM D348Q ' , , ,..:: , , , : _ . Project; Madouc�a Troom Rancla �roject No.: SL09734-1 Client: Date'I'ested: 6/9/2016 Sample�]a.: B-1@5' Deptf�: S.OFeet ��abiVo.: 165t6 Location: B-1 Cl�ecked By: t1L� � _ ''. - ; %passiFi6 ' TvL4�'�RIAL DHSCI2Il'T'IOiJ LL Pi, PT G�s* Sample Type i�' No.200 'Very Dar1c Grayish Brown Sattdy CLAY mm �m mm �m 2.4 ici-situ(ri��gs) "Gs�assc�med;nzn�not measured •���a� a= 1 ksf �«- a-2ksf �-_= a-3ksf ��p"�" °`� ksf�- �-2ksf� Q-3I<st--•• Q-�#ksf -�� �=4 ksf o peak o Ultimate 0.000 -- 2.5 -- �y� _ � .• r. ES ,, ,•,'"�� � 6.fl05 , i= i� `� 4 " „-- � �n 2.0 _. ._..- r .J e\4_ __ _ � f� _ � � s��.� � °' �.5 _._ ����``���� _- � a.o�o � ��.�m - _ _ � �{/ o \�`�,� `��� � _ �.o - ,� ___ �- -- � � o.o�� -- � =__- - � � �� � w�.e_�e, m�de � ~ aI 0.5 --�=, lP�� M --_ .-- � � � � �m �i r , �� 0.020 - __.�.,�-�---_:� � �,°:,.� r,� �`�;'.`� 0.0 � " 0.025 , ���.�.•z.. 0.00 0,10 0.20 p.06 0.05 0.10 0.15 0.20 Horizantal �isplacement(in) Horizontal Displacement(in) 4�Q Tnitial S�aeci�ne��No. d Peak Condifioi�s 1 2 3 G� 3-5 o Llltimate ___.._ -- DryDensity 92.3 903 87.h 95.7 3,6 �-Lii�ear(Peak} Water Contenf(%) 25.8 25.8 ZS.B 25.8 � -m -� I Dia�neker(nz) 2.42 2.�42 2.42 2.42 � 2.5 --- --- Sample�Teiglat'(in} 1.0� 1.00 f.00 1.00 in 2.0 f- _�___ , Specimen I�To. � Test Data � 2 3 4 L �.�J ""' ___.....___- ____'_ � � Nonnal�tress(Ics� �.p0 2.00 3.d0 4.00 �•fl - --- -"-� - -- Peak 5�iear Stress(ksf) 0.77 1.06 1.85 2.23 0.5 ` -- ---- T�oriz.Displacc�ienf�t 0.15 62�i 0,2={ 0.24 / Pealt 5hcar(in} �'� L �� J Ultiznate Sliear 5#ress(Ics� 0.58 1.06 I.85 2.28 0.0 1.0 2,0 3.0 4.0 Narmal Stress(ksf) IIoriz.Displ,atUlY.Si�ear p 24 0,24 0.2�1 0.2A (in) Angle olTn#ernal Frictio�t,plpea�(degrees): 2$,� Rnic of Taeforrnatina� Co1�es�on,C s it�hnin 0.0�2 0.002 0.002 O.OQ2 �c�x tP � I10 � ) lZenzarks: Stnnples were not sahirated prior lo slieariing BS 17020 �C.�t'�C��Ei: F��E��'����C�� �+in�l Repaz•t tABO ,Z �e1� ORi � S ��11� A.�b�sto� cl.t�l:l�,�. A�.1a��51,� (Air Resaurccs Baard Me[l�nd 435,June 6,3991) GeoSalut'sons, rnc. CTiertf ID: 44�7 To€ln I�arstmer Repo��t Ntim6e��: N008336 220 Higll St. D�ite Received; 06/20/16 Date Analyzed: OG/27/I6 San I,uis OUis��o, CA 93401 Date Prittteci; 0G/27/16 ,Job I�/Site: SL9734-1 -Froesn Ranch i`ALT Job ID: 4947 Total S�tn�les 5tthtnittecl: 1 i'�1I�Y�8eperr•f 1�Ie�mbes•:N/A '1'otal Samgles A�ialyLecl: 1 �aa�ig�le I�re��ar•ateo�� at�d Are�����s: � -- Svn�fes were analyzed by ttie Air IZesources Baard's Method +�35, Detern�ination of Asbestas Content of 3erpei�tine AggregnYe, San�ples 4vc�•e ground to 7_00 parficle size in the 3abor�tory, Approxin�ately 1 pa�it was�•etaii�ed for analysis. Sunples wec�c prep�recl for obseavation.�ccordi��g to the guideli�ies of Excer�tion I and Exception lI as defincd f�5�ihc 435 Method. Samples wl�ich contained lass than 10%asbestos were pre��ared for observation according to tize poi«t coLint technrc�ue as defined Uy the�135 Metl�od. This viatysis was perfoa•mec}wiili a standard eross-l�air s�etiele. Sample ID L,�tb Number Layer Dcseription Ilboei€ fl 11777123 G�•eylGa�eem�to�ies Point Cotr+at Results: Number of asUestos points co«�lted: 0 Number ofnon-ernpty�oints: 400 Matrix pereentage ofentire 1QD �e��eer���sbestos in in�trix: �4.2� V'ssual estimation percet�tage: �1 Asbestos lype(s) detected: Clarysotile Comment: As�estos was detected bttt no poiz�ts wer•e counted due to cot€nting crite�•ia.Tf�erefoi•e quantifation deemed to be<0.25%. � $ � � ; � ��:L '!����C�-(�IJ�P/�_1� T�d TI��•owet�, L�boratory 5upe��visor, F3aywa��d Laboratory Note: I.i�l�it of Qua�itifsc�tion {J�QQ)=025%. Tr�ce dcnotes tlle preset�ce of�sUestos Ue4o�v tl�e L�Q.NL7=Noi�e Detected. �' Analytic2l resulls nud repor€s are�eneraled by Foreusic Aualytical Lfibnratories[ne.(C'AL])at the request of and for tlie exciusive Fise ofllie persoii or ei�iily(clien[)nameci on such report,P�es�ilts,reports or co�}ies of sa�ne�vill�iot be releaseci by FALT to�aiy tlrird paity�a�iihotit prior writ[cn reqiiesf 1Gam cliefrt.'i'E3is repott applics ouly to fE3e sanrpfe�s)Lesie�l. Siippo�ting laUoratory doeumen[atio��is avaiiable upoci request.This report FnusE not be reproduced cxcept in full,i�nless approved by FA1.i.The cliei�t is soiely respoe�siUle far il�e � ase and intcrpretatiait of test rest�lts�nd re�orts requeste[i£��oi�� PALI. Forensic Analytieal Lc�boratories Inc. is��ol able to xssess tlie degrec of hazartl resulting fro��3 materials analyzed.FALI reserves!he rigl�t ta dispose ofal!s��n�>les aftcr a period oFti�irt��(34)d�ys,according ko all state aud federa�guidelines,ttnless otherwise specified. All sanZples�vere received in acceptable condifip�i untess otherwisc cioted. 3777 D�pot Road,5uite�409, Hayward,CA 94545 1 Telephone:(510)887-882Lt (800}827-FA5[ ! Fax:{510)887-42T8 1702�� l i F' m:�:.._ c,� a � i�c��•unsic: A,ial,,9i�;c�! 1.�1L�(��Zl1'f��l�if:`� ����nl�/sis i�:��«�s# I�ar��r� �C;(:)C.��� �.� ��. Clir.s�l I�c�rsru�Adclre.s.,-.^-- ---- C`:ien1��;��:.�_- ---_.w.—_.._�,'!:}�!t,i,if, ^ � ; ,' �! 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I�:� .__ _.�._...._ ___ _ � __ ._ - __.�___.__._..�:._____.�_.W ._ _ ._.._ 5arr�Es(t;rl fs,r. ��� b<rlr Jltmfs: �' `'hii��suel V�� � <CY ��_lfl'S �-l'LJS f�hc�il �1fCo,irier iliDrap�f( ��I C)fhar; _ .�LJ' ri}�r�11� .-- "-- --.._ .�-��J!�(�_ �� __ d �` �...r.,_...v ._ �tcl3t�qui:{�e�1 i3y: P.�liFx��,islr;;d Ea}� - ��•rt"'���,� �SclinC�uisl]tr�Isy�: ��`t !.�, , : . ,.����_�5=f._-. �)aIa's/l�irrF�: Ut73a/Tjrrit� f l IJn�n f,.Ciiru; , J . , _ . .__. � ;. f `�:� ' f3/�.���t'- � � �if# ` �� �'; _�€ �__.Y '--Wr._�_____..--- -�_:_..__. _�.___�n. — _�„ ..— _ _._.._. -.�.__� ;tcr.r:�v�d B�: R�:c�ive�13�� � ��, l'? �� 1 "� #�o�.c:ivvJ t�y, ' ' ��3a � � � i��.���, ���# : ? �;?afc j Tir;7�u; i?ciic?/rimis � �'. �� r' -� Drita/7im�r: Caric#itivn lfl�ce��lcrl�[�;a j�t Yrs j�3;Nz� W [:c�n��iilior3 lcce�l�a€�I���`�-,�r�� '(''3�lLt �ar�c�il'sun Accepic���f�:� I�YFs----��7,I�la _ ,.,-- _.��� �ort:ns{c A�stily3�col Lol�oralorins mray st�4sr_�iatrcrr.t's.li�ii!'srr�z�le3"1n of�ier I�Atf Irse,ulknns 4r��n3�-al cli;;t�?requi:sfs, `.sr.,r�4=rur�.c:i�co G(£ir;�:: i"l77 l]r;�>ral(tc+rsrl, �i�il�11E)fd, I luyt�ts�Fc�, C�A�)4:i�i5•Alfsl t i'Ituire: .i1Cl/f3l�i`�Qt�`lf3 � Uf1U%1'�2!•:}2`o'r� lcrs Anc�r�ses Ci��ice.7�J,'t`I�Y;:�r.�I�ic C.'c;r;sait�ir�C:tiv�i, �Y�nclf�i Oai��tins��elc,C;1t 90121 n 1'istana:;�10�743�?.7T�[ • IIf(f3%G l:!•939 1l I,tss Y��i�c�s C7lt%r,a: c571r i ii, f-.eislcr+j�tv�;zufr;, 5uii�:;], Lc�s 1�erjas.1kV f;�i!?4� e I'Et�sn[�.7(�:j/7t1�1-f)Q�1C) 17022 Noveml�c�� �8, 20 f 6 1=C1 P�-ojecl No, 36"f 3 ' ;: i .��,�� � �-. Ea�th " , � � ��Cor�sultan�s �.� Internationa� Ta: Pacific Gas � Elecfric Company Geosciences De�a€�t3��ent 245 Marl<et 5trcet, MC N�C San Francisco, California JA105 Attention: Dr. Chris Madugo, 5enior Geologist Su�bject: I�eport - 5oil 5tratigraphic Assessmenfs in S�ipport of a 5tudy to Characterize the Activity of 5trands of tl�e Los Osos Fault Exposecl in Trenclzes AEong tl�e Los 4sos Valley Road, in San Luis 4Uispo, California �H.0 INTRODUCTION We are ��Icasec6 to ����ese��t th€s reporf descE�ibiE�g our findings of a soi] steatigra��hic study #hat we co€�d�rctecl at you�� ��ec�uesl for a site �iaFig Los Osos Valley Roar�, in SaE� Luis Obis��o, Califor��ia. Tf�e ��n�pase of our study was �o esti�i�ate th� age of t1�e soils ol�serve�l in trenches excavated k�y otf�ers, These trenches exr�osecl st��ancls of tl�e Los Osos fault, and we �ve�-e asl<ed to E��'ovicle assistance in characterizing the age of the 501�5 invalvecl in lhe fa��lting to better �mclerstand #he recency of activity of the faults exposed, a��c! if possi�le, tl�eir earthquake recu�-rence. Determination of tl�e age of the faults ex��osed will be conductec! by othei's using o��r soifs c4ata aE�c9 observations ��egai°cling how the fai�lls interac# with vaF�iaus surface ancl k3uried sai[s that we identifier.l in two trenches. Z.1 �C4PE OF W�RK The sE�ecific tasl<s tl�at we cat�cluctetl as part of th€s study a�'e descri�ed below, More cleta€ke�l info�'mation regarcling the methodology we used lo �fescribe �he soils, calculate tltie soi] inclices, ancl estimate the agcs of the soils is ��rovidec! ii7 the foklowiaig sections. • We reviewe�l photos ancl ��I�atamasaics of the tt'ench exposures a��c� c�isc��ssecl our preliminary i�rr��ressions with yo�� and thc �roject team via telephone ancl viclea cot�Ferencing. • We compilecl, reviewecl ancl analyzet! sever-a9 soil cht�anosequences ancl soil ��rofiles F:� clevefopecl in coastal areas of centra! ancl sauthern California ancl thc Baja PeE�insula, Mexico, that were clescribed ancl clatec! l�y others, ]f soil clescriptions were providecl in the so�n�ces usetl, we calculatec! their Soil Devefo��ment indices (SDI) anc{ Mean Ho��izon [ndices (MHI) in a�� effort fio develo� soil cf�ronafunctions a��pro��riate far the 5an Luis Ob�s��o {ocation. The refe�'ences �rsed arc listed in A��pendix A. • We traveled [o/from the l_as Osos Valley treE�ching sit� in Sai� �.uis Obis��o, where we reviewe�f thc trench exposures still open, discussed with you thc stratigrar�hy abservecf �6�2 E. Fourth 5ta�eet � 5anfa Ana � California � 9270"I �� USA Telepf�oncs: 714-412-2G54 � 5�4�-5321 � 1=acsimilc: 714-49�-�4930 K�� www.ea�-thcoi�sultants.com � 17023 L I' �(]VC'f7]�]el' ��� 2��G ECI Prc>ject No. 3b l 3 in the trcnches, �tn�l pliotographecl and collcctecl soil sam��les f�-om four se���r'ate soil profiles. INe alsn collectccl samples of unalte��ecl o�� sfigf�tly alterecl alluvi��m from �kie walls of the active wasl� nelr the east sicic of tf�e ��roperty to use as F��'oxies for ��ie soils' �arent 3naterials, � Sack in aur office, we com�letec! the soil ��rofile desc3•iptio�is. These �re ��rese�ited in Appcndix 8. m VVe calculatec� thc SD[s and MHIs for tl�e profifes that wc cl�scril�ecl iE� the ficld a��cl compa�-ec! ther�� zo the i�iclices af the soifs �lesc�-ibecl anc! datec! by otl�e��s tl�a� we hacl analyzecl ai�d com��ilecl ��s pait of c�ur desl<to� stucly. Using tl�e ch��o��ofunctions clevelo��ecl from the soils c{ata a��afyzecl, we es�i��iat�d a range oF ages for the soils at t1�e si#e. Tl�c soil agc estimaz�es computecl we��� then veitecl for reasonableness L�asccl on � �: to��ograpl�ic ancl geomorpf�ic ��ositian, �i�d geological context. • We C�re�ared this re�ort sum�r�arizing tk�e worlc coEr�pleted. ; , � � � 2.0 METHODOLOGY USED FOR SO[L-STRATIGIdAPHIC ANALY�E� '� 7..1 BACICCIZOEJND Tl�e ter�n soil as �rsec� herein refers to a n�tural boc4y of mine��al aE�d/or organic material coE�sisting of layers (or horizons) that a��e clifferent fro;r� the unclerlying o�� original g�ologic (pa�'e�it) materia] iti theia' "mor��ho[agical, physical, cheEnical and ���ine�-alogical pro�e.�'tics i ancl their I�ialogical char-acteristics" {Bir]<elancl, 198�}, These clifferenccs a��e lhe resuft of : we�tEhering and ihe effec[s of (i�e mai�i soil-fo�-�ning factors: parent material, cfimate, slo�c ',� o�� to��ography, organisms, and time {Jenny, T�J4�). Time is an im�ortant f�ctor bec�use the ,� longer a geologic c�eposit is exposed ta the effects of weathering and so€I formation, t1�e '[ beitcr devela��ecl the soil char-acteristics generally beco���e. We taE<e aclv�i�tage of this � when using soils to estimate the age of the cle��osits. 5oil cle�elapmeni occ��rs oE� stable geomarphic s��rfaces (a st��l�le s��rface is one �hat is not being significantly i�����actecl by clepositio�� or' erosion}. 5oil cle�elopment tyE�ically starls to accur as soon as a sur(ace sto��s beii�g erac4ecl ar cle�osited on, Thcr�iore, €n sat��e environments, such as an all�tvial ��lain or alluvial fai�, it is commo�� to find several wea[dy �o made€'ately �leve{opecl b�riecl sails tl�at rest ane ��pon the otiier, sometimes se��ar�atec] by una[tere�l or only slightly altered secliinents (the �arent mat���ial}. l�he soils represei�l periocls of sub-aerial weat��ering ancJ soi] formation th�tt occ.urred in between �eriods of al[uvial erosioE� and cleposition. In tl�ese e��vironments, lhe �ge oF the primar-y, unaltered tleposiis is cstin�aled by s�mming � the age of thc incli�idu�l soils, including the sEtrface soil a�ic[ thc buried soils that ove��lie the seciion of in[e��est. It is importanl ta recognize, howeve��, tl�at the soil-age estim�tes will ��ro�ide a r��inimum age for the E�arent materia[, as the estimatecl ages clo not account for the length af time it taolc For tl�e sedime�its to be cie��osited. Furthermore, €f ��ortions of soil horizans, o�' even e�iti��e sail horfzans, have been removecl (truncated) f�'o«� the area by erasion, the age estimates will nat captu��e that erosianal period oi time. Nevertheless, if these limitatic►��s are recognized, soils can provicle �rsef��l informat3an on the age and geological histary of a construc[ianal surface, such as an alluvial or �na��ine terrace or alluvial fa��, Tl�is is especiai[y trt.Ee for sediments that �) c[o not conlain sLtifable datable materials st�ch ch�rc.oal, 2) whose age extenc�s beyo��d the usefu[ ��ange of raclioc.arbon Report—Soil S�ra[igrapf�ic Stucly in 5upport a{Fault Investiga�ion Page 2 San L�.iis Obispo, Califor�3ia 17024 E Novcmber 1�3, 2(]76 E:CI Pi�oject No. 36i3 dati��g, 3) that ���'e too coa��sc�-gt�ai�iecl or taa clayey to clzte �ising Opti�ally Stimulated Luminescence, and �) cantiot be datec� I�y soine nther ak�soi��te clating metE�ad. I�i thcse cases, soil-age estimations are partic��l�rly useful, 2.2 SO1L D�SCRIPT[OIv1S Fo�' tl�is project we desc��iE�ecl fau€- soil ���'ofifes; lhree i�� trench T-TA ancl one i�� tr.ench T-- ; 2/-�. Th��ce of lhese pro�riles incl�rc€e a s�€rfzce soi] and two �ri�cic�E�lying f�ut'€�r� sails. -I-he last ;; profi[e we clescribec9 is a soil clevelop�d in a �ining-����war�! sectio�� of fi��e-grained sediments th�t wcrc �le��osited in � ]aw s��ot that �����ears lo I�ave (o�-mec� as a res�rll af ���ovement oi� the adjacent fault. These secliments are refe�-red lo here �s "poi�cled �lepasits." I_astly, we also co[lec,ted ai}cl desc��ibed samples of ��nwea�herec! ta slightEy weatherecl alluvit�m from the activc c9ia����cl nea�' the eas[er�� pos-tion of the site, These alluvi�l deE�osits are cansidere�[ repr-esentative nf the ��arent materials fo3� the soils clescribed in ti�e t��enches. T1ie c�escriptians were made using a combination of the characteristics a3�cl no€��enclatur�e estaE�lishecl k�y the Soil 5urvey Staff (1975, 1992), tE�e National Soi[ 5u�-vey Cenler (2012), ancl Birl<eland {1984, 1999). Color•s of the soil horizons wer� reco�•cled k�y ca€r�pari��g tfie color aE the matrix ancl clay films, both ii� the c�r�� ancl wet states, to calor chips in a M�msell Soil Color Chart. Qther characteristics that we recorded incluc[e: T) textur-e or g��ain-size �Jistrib�ition, 2) struc�urc (whethcr the soif mass br'ea!<s into dislinctive ��eds, or is single-gr-ainec{), 3) tlze ama��nt, distri��ution a��cf thicl<ness of t���nslocatecl cf�y fa€-i��ing films or stains on the soil � pecl faces anc{ clasts, in }�ores, between s�tnd grains (called bridges}, araunt! cl�sts, a3ic1 in c€ast C�ncicets, 4) tf�e foose�iess or induration of the soi] pecls when clry anr� moist, ancl 5) the sticl<iness and plastici[y of tF�e wet soil. The sE�a�'pness and relief characteris[ics of the ' co��tact (o��bounc6ary) between horizons were a{so noted. '� � � 1=inally, we also notec! ancl cjua[itatively clescribed tE�e content, size, ai}gu[arity or � �'oundness, ��reclominant compositio�i and clegree of weather-ing of the clasts founc! inixecf � with thc fine�'-grained sail �natrix. Th� clast weathering stages used fo6low tF�e � nomenclature cleFi�iec! lay Tnsley and athers (1982}', who found a ��ositive correlation E�ctween tl�ie age of a cleposit a��ci the degree of w�athe�'i��g of the c[asts therein. The �� coinplete soil descriptions fnr all prafiles are ��roviclec4 in Apj�enr�ix B. �� 2.3 501� INDICES AND D�V�LOPM�NT COMPARI50NS '� To estimrrtc the age nf geologic de��osits using soil-stratigra��hic techniques we rcly on � '� cnr��p�rison of the characteristics of the soils i�� c{��estian wi[h those of atl�er soils � i � � 3 � Sta e 1: Unweatl�erec! beclrocl<, rings.shar��ly to f�low of ha�r�mer. � 5t_z�c� 2: 51igE�tly weatherecl bec[rocl<, itici�ient to ���ad�rate surface ��itting, fractu�'e�l, wi[fi � oxidation rincls grcater tf�an 1-2 mm iE� thi�kness, yields moclera[e ri��g to f�law of hammer. 5ta�e 3:5uE�stantially wea�herecl bedrocl<, surface F�ighly piltcd, strongfy fracturec4, mafic rninerals and felclspars may be st�'ot�gly altereci, clasts ca�� L�e bro[�en with clifficulty f�y han�l, d��ll sound to f�law of hamtner, 5t. age�: Very strongly weathered beclracl�, easify disaggregaled by hand into grus; very r���ll so�,ncl when strucl< witF� hammer. �eporl—Soil Strafigraphic Stucly in 5u��port of Fa�€It lnvestigation Page 3 San L�.�is Ol�is��o, Califor��ia 17025 � � Noven�ber 1 n, 201 G ECl Project I�o. 36"I:l dcvelopeel in similar ��a��etit m�ttet�ials ��ncl cli�nate conditions th�t have Eaeen c9atecf using � k�nth ausol��te anc! rel�tive clating ���ethods. 1=nr this qua��titative co�n�arison, tl�e c1i���acteristics of tl7e soils �re assig�ied numerical values that are then �.ised to calc�€late tfie soils' tlegree of clevelopment. We usecl two of these c�u�ntitative methacls for �his st��cly: Harden's (19n2) Soil Developfne��t Index (SD!), ancl Ponti's (1985) Maxim��m I-lorizon Incicx (MHI). 13ot1� SDI ancl MH] va[ues have bc�en show�� to be ��seful relative �nclicato�-s of soil ag�, witl� older, better cle��eloped soils ty�aic�lly having I�igh�:� SDI and M1-il v�lues (I-larden, "f 982; F-farcl�n ancl Tayloi`, 19ti3; fZocl<��ell et al., "9 984, Rocicwel I et al., l J90; f3ornyasz aticl Rocicw�li, 1997). ln these c�uantitative assessments, the characteristics of the sail are "s�rEatractecl" f�•om the charactc�'ist€cs of tf�e ��ar�nt �naterial to c.levelo�� an em��irical estimate of the le�igth of time that a geologic def�osit fias l�ec�n sul�jectecl io thc effects of weathering ai�d soil formatioiz. Fi�lcl st�rdies have shown that ali othe�� conc�itions l�eing ec�ual, a soil develo��ec! in fine- grainecl sediments ap��ea��s better cl�velopecl, with incr•cased horizonatian ancl ill�rviation, tl�ai-� a coarse-g��ained soif of simila�� age (Racl<well et al., 1985). We �tcco�Fniecl fo�� these diff�rences whef� estimatirig the age of thc.se soils as follows: For the coarse-grained bu�'i�d soiis we �Fsed the gf�avelly loamy sanc! �Iluvi�im tf�at we collectecl fram �he actsve channel as pareE�t material. Fo�� the (i��e-graineci su�'Face soils anc! thc ��oi�ciec! cleposits, we ��sed sancfy loam ailLrvium as the F�a��ent �naterial. The desc��€ptions of these all�Evial parent materi�ls are ii�cludec€ i�� f�ppenclix f3, at the er7cl. To oL�tai�i mi��imtrm age estimates for the soils in the ��rofiies describecl, we com��are�l the i.; soils' SDI and MHI val�€es witf� the chronof��nctions presentec{ in Dolaiz et aL (1997; see ''j G��a�hs 1 and 7_ bclow), whicF� are bascd on thc� cf�ronosequences c�f the Ventur-a Basin by � Rocicwell ("[983) and Rocl<wel l el al. (7 9t35), the Mercecl Va11ey by 1-larden (1982), and 'j Cajon Pass by McFadclen ancf Welclo�� (19t37). Since two of these ch��onosequences j (Merced Valley ancl Cajon Pass) clevelo�ecl ii� inlancl areas of southern Califor��ia not � exposed to coastal fog, antl are lhus unlil<c the coastal area of San f_uis Obis��a whe€'e thc site is �ocatecl, we also compilecl, re�iewec{ ancl analyzec! fou�- addition�l soil chroi�osec�uences cleveloF�ed '€n coastal aE'cas of cent�'al ancl 5o��the��n California (Ttocicwell et al., 1994; Muhs, 1982}, ancl in ihc Baja Penins��la in Mexico (Rock<wefi et al., 1993). Coastal soils ty��ically de�elop Faster tk�an in[ancl soils L�ecause soclium input fi�om sea s��-ay � ancl coastal fog I�elps to cleffocculate {c4isperse} the c.lay �ninerals (Shlemon, 197n; Shleman ancl Hamilton, 1979, 13ir1<el�nd, 1984), ancl the moisture provided by the fog l�el��s to t�-anslocate (mobilize) the clay fraction dawn the secJiment section. As a res��ll, argillic (Bt) soil horizons tenc4 to fo�•m faster in this environment tha�� in mo��e in4anc! areas not suk�ject to il�ese €luxes. Tl�e properties of these soifs were t�uantifiecl using both thc Ha�-clen (7982) �� . ai�tl Ponti (1�85} rrle.thocls to clevelop soil indices tl�a�we ther� ��lotte�! as a function of time ;; to develoE3 chronafu��ctions thlt woufd theoretieally be �iiot'e ��e��i�esentative of the site that� ! some of the cf�ronosequei�ces useci far the soif age regressioiis used by DolaE� et al. (1987). ; � t ,, 3 I t � � � � . � Report—Soil 5tratigraphic Study in Sup�ort of Fauit {nvestigation Page�€ � San Lurs O�is��o, C�lifornia � � 17026 � � � � € i: �lovember �€8, 20�IG ECI Project �lo. 3b13 Gra�h 1: 5oil ❑evelopinent In�lex Vs Log Age �tegressior� pu�lisl3ed �y ❑ola�i et al. (7997) antl � €�sed in this st�idy to esti�nate t�e age of the l.os Osos Vallcy 5oils �.r�; i'"� � ,:,}. ✓.� - ��:.�." _ J"� ��✓ .��{1' -�4� _ '. fJ Y . ��� . "{. �� u :)'� .� .. o(Ik - O✓ L u'1�.�� � �le.t; �p'�n ' 17 � ,. � u rJ ___ '.� ❑ /A —t �'. � t .,i r :t J.. i'':'��G'�� ro'q:l,�' �I RI 1'+`t..i�i�;1j �,. •.�f:C�l a):].i !�I](1-i i`i7fU ilYl:l �rCll.`;1 ;�(7�"1} SotlOavaiGAmaclin�3nY.45;.i)Vuua � Graph 2: Maxim�Ern Horizon Index r�s Log Age ldr.gi•ession published by Dolan ct aI (1997) antl used in t��is sfudy to estirnate the age of the I.os Osos Valley �oiis i LIF1. ❑ �+ � F,,,i .- "� � �:iti3� - 'n• , q� � c �`3 � yn v 3 e ..:�li +� �- ° � ��ic� ✓���, B . . - ; � s � .x<�,, � __i��a:�c:cro�,��.� o ___';5;f.C'F'„�i.Js�SY '. � ,151�Cift�rr�r�'�.;{eY � n C'.�:=�s_f� J ;6�'I� � y qi E3 � 4.:.1Y i � � i � � s �Cri;. . _.. , , . . : . . ° —' ` UCJ r3:ti�� ri,.t: i{:r13 I>.q� r�n nL-J U�❑ C.:_O l�V.l t,�5 ? � F',mimum t!o;Icon Iral7x fhnlf}yolaa ' i3 � I� The age estimates calc��lated usi��g soil-stratigr-a��hic methods ��rovicle lhe ap��roximatc '� minimun� length of #ime that a soil was ex��ose�! to soil-formit�� ��rocesses when at the � g�'ow�cl s��rfacc. ln a�'e1s where the surface soil is uncle�-lain I�y onc or more �urieca soi[s, ;� 3 Rcpot�t—Soi! St€-at€g�'a��hic Study in Support of Faulf lnvestigation Page 5 � San Luis Obis�o, C�lifo�-nia ' ,, 17027 � � � I �: Noveml�er 1 E3, z016 ECI 1'raject No. 3b13 tl�e agc of the bu�-iec! soils a���l the unc{erfying s�r.li���ents is hest estii�ated f�y �cidiEig tlie agc of tlie ove��lyi��g, s��rfac�� soil !o the an�o�mt of fitn� fi1�al �acE� of tf�e no�n�-(�ur€ec[ soifs was exposed to soi]-forming processes ��rior to f�urial. This ���ethc�d is consic{erecl to ��€�ovic6e a minim��m �ge for tlie sec4iments th�t the soils develo�:�ec[ in I�ecause tlie age cstimatcs clo not account for �he I�ngth of time ii toolc for the sediments to k�e cie��ositec[, nc�r clo tf�ey iE�ciucl� a��y soils (or po��tio�is of soil horiz_ons) si�icc re�novecf by erosion that are no longer present i� the record, Finally, and oF significa��t note, the age estimates obtainecl l�y a��plying these chronof�i��ctions ��eccl to be e�aluaicd ancl recoEiciled with otf�er criteria that also provide ge��eral i��formation on the possil�le age of the sccliments, Tf�ese criteria i�iclurle but are not limitecl �o geomor�3hic position ancf tl�e region's Q�r�ternary f�isto��y, i��clticling glacial anc4 intcrglacial evenis that cfeffnec6 whetl�er the pi`oces5es of incision, bacl<fill, or soil fonnat�on prec�ominated. 3.0 Fit�1DIf�1GS 3.1 SUMMARIZED SOIL PROFl�E DESCRiP�IONS j� Threc of tl�e soii p�•ofiles that we clescribed ii� t€�e€ichcs T-ia anci 7�-2a are €�elafivelJJ similai` ; in a��pearance �nci stratigraphic positio��. All threc of tl�ese profiles iia�e a surface soif anc! i; two buriecl soils (Soil 1'�•oi�ile 3 in �F�rencl� T-2a has an ticfciitionaf t��uticatecl soil that is k���riecl ; uncler a low-angle faLift). Characteristics of each of these soiEs are sutnmarizeCl f�elow. I�or � the com��lete soil clescriptio��s, refer to A�i��enclix [3, j Surface Soil: ABl1/ABt2 in 1'��ofile �; AT/A2/Bt in Profife 2; AllA2/Btj in I'rofile 3 � -�he s��r(ace so's] consists of o�•ganic-rich silty clay to silty clay lo�m that is very clarl< gray ' as�d darl< E�ro��vn whcn dry, �nd bf�cl<, very darl< brown ancl vety dar[� grayish I�rown �vhen moist (10YR to 7.5YR hues). �-he scction is ��efween 43 ancl 58 cm thick, ai�d l�as charac[eristics of E�oth A �ncl Bt horizons, with stri�cture [Eiat E�a�iges from g€-anular within '` the root zone to strong subangular blocl<y below. Clay films in the argillic sec[ion vary I frosi� few to co�nmon thin to continuo�ss tE�icf< o€i pe�{ faces, co�ting clasts anc6 li�iing clast ',! pocicets. Sanc! gt'aiE�s ai°e commo��, but fine gravel-sized clasis �rP few anc! sc�tte�'ed ;� thro��ghout. � This c!e}�osit is clistinctly fi��er-grainec4 lhan the Lfncier4ying buried soils, with only a few � scattered gravei-s�zccl clasts, as�d a high concentrat€on of sift. We suggest that if w�s � dcposiLecl primarily by eolia�� ��rocesses, eithei- as coastaf fog fallout over a long periocf of ti���e (1<eller et al., 19BT), or as a �aieod��ne emf�laced during a ►na��ine regression, typically cluring anc! aftcr a fafiing sea level (Orme, 1990}. Orme (1990) nTapped severa! paleoclune dcposits in the study area ancf to tlze sautf�, incl��ding several tliafi "feather' o��t at 300 m against the San Luis Range (frisli Hills)," �1lthough Ormc (1990} cficl i�ot map r.�une cleposits i�� the immediate site �icinity, he i�iciicated that Pleistocene eo�ia�i deposifs in tlie region ar� b�iriec( uncfer preclominantiy fluvial sec;uences, resulti��g in com��lex stratigraphic sectioi�s that require acfclitional research. In the Santa Maria ancf Santa Ynez �alicy south oF Pisino Beac.h, O��tr�e (7990) mapped se�eral late Quaternar'y dune de��osi�s more than 30 I<m inl�ncl, including ��aieod�me sediEnents that nearly wrap aro�mcl the Casmalia Hifls. These observations ind€cate tf�at it is ��lausible for similar paleocl�tize secliments to occu�- in the site vicini[y. Bur1�e et al. (2016) have studied sediments with similar ch�r�zcte�'istics i�� Re}�oit—Soil Stratigraphic Study in Suppoit of Fa�31t In�estigation Page 6 Sa�� �.uis O�is��o, California 17028 � � �� Novem�ic�- "18, 20i6 ECI Project �lo. 3G 13 colstal ��orth�r�i Cafifornia, and suggest that these ealian sediments �vere c(e.��nsited dueing the last glacial «�axim�rm, 20-301<a, t First �3uried �oil; "1f3t1<4�/3Blf�/4BCb i�� Profilc l; 2Bt1cL� in Profile 2; 213tb7/2Btb2 i€� P��of€�e 3 In two of thc €�rofiles describecl, the fir•st buriecl soil is defin�cl [�y, or inclucles a calciu�n carbonate-rich a�'gillic horizon (13t1<) with Stage I to I1 c��[cium c�rbonate as coatit�gs oji ��ed fac�s, lining pores, in veins, and as nocfules (M�chette, 19n5}, San f_uis Ol�ispo`s c�irr�nt clit��ratic e€�vironment {�i�nual ave�-age ��reci�itation of 48.3 cn� and te�»perature of 15,2"C} is not cnnd�ici��to the formatio�� of Stage I-II calci��n� carbonate n�or��hology. 7hese calcic horizons [her'efore RlOSf �II4P_I�r fo��«�ec] w9�e�� this area was clrier ancl �Narme�- t1��lEi toclay, someLimc r,luring t}ie Plcistocene. Tl�is I��rE�ie�! soil is a rela[€vely ihin, ��a�'tly t����ncated soil tl�at varies in thiclu�ess b�tween 39 �nc� 6� cn�, AIt9�ough these �re �ninimun�r thiclui�sses, as tf�e A ha�-izons are not�reserv�cl, and tl7e argillic. horizons appear to be truncatecl, �h� l�etter�-���°eserved section in Profile 1 is ; stiif tliin, s�tggestin� that this burieci saif was forr��ec! during a clry ��eriocl, lis��iting the ; effec(ive dep�th of tE'anslocated clay. �T�he harizons a�scr�ec! liave a silty clay to silty cl�y ' loatm texturi, with visibEy n�ore gravel than tl�e sui•fac� soif d�scriL�ed ahove, ancl �i�oderate � fo stro��g sul�angular biocl<y to pt-ismatic structur�. Color hues arc gei�erally in t�e 7.5YR to � i OYR range, witf� iow cheomas t�af are the resuft of over-��rinti��g by (�eaching Fromj the j� ovcrlyi€�g o��ganic-rich s�.�rface soil. The clay filEns are well deveio���d, cfesci`ibecf �s ;� moc[erately thicl� to �hicl< and common to continuous on pecl faces, coating clasts ancf on ,� clast ��ocl<eis. /�ll of these characterislics i��ciic�Ee a ��efalively fong �eriod of ex��asure to , soil-fonning ��rocesses. [n the trench wa11s tfiat vve revi�wecl, tfie cont�€ct l�etwe.en this first ';j buriecl soil and the unclerlying buried soi) is loca[ly clefin�cl by �l stone[ine consistii�g o� � rouncled to subrounc�ecl pebbles ancl col�bles, suggesting a hiatus of cle�osition k�etween � the d�e�er- buriecl soil and the overlying deE�asit. � Second B«ried Soil: �f3t1�2/5Btb3/513tb�/GfitbS/b[�tb6 in Profile 1; 38tb114Btl�215Btlam�b/5[3tla�n2b in Profile 2; 381b3/�€Bt1�4 in Profile 3 In P�-ofiles T and 2, this second bu�'iecl soi] ranges in [hicicness froni "C 33 to �5"I cm. 7hese are minirrium tf�ic�cnesses as tl�� A horizons foE� these soils are not prc�sc.eved, ane! the overlying ar�illic horizons are most lil<ely trut�cat�cl, The thic!<ness of the second I�uricd soil in Profile 3 is unknown, as tl�e L�attot� of the soil is tt'uncatecl I�y a low-angfe (ault, although its a�iginal thicicness co��ld be rccaR�slructecl if we. are correc.t i�� our assessment that the buric.d soil befow is ��art of a repeated section. In the a��ea whei�e ��e described ouE� soii ��rofile, t�e fault zon� appears to €ae enhancecf l�y franslacated clay, whereas farti�er east, close�'to wha� was the slope face �3rior to ����f-ial, tf�e fa��lt ti� is obscurecl by soil devela��siient. This sLrggests that the faulting event r�presenteci k�y #his low-angle fauft occ�irrecf wl�en the cleJ�osit was stiil being expos�cl to E�edoget�esis, prior to ��urial by rhe overlying allu�iaf fan cleposits. How��er, at Station "f.2 the fauft piane removed the 6ottom section f�'on� thc zone of��ecfagenic influence. Tf�ese now-buried soils develo��ecl in coarse--grainecl ��arent n�atirials that include rriany scattered clasts sevcral inches i�� diameter, yet thc texture of the soils ranges from silty cfay to sandy clay, inclicating significa��t chemical weathering of the original ��arent material ancl/or accuE��ulation ancl tt'a��slocation of witicl-lranspor-�c.cl silt ovcr a lengthy ��eriocl of Report—Soil Stratigra�f�ic StEidy in Su�a�ort o€Fault Investiga[ion Page 7 Sar� Luis O�iispo, California 17029 £ f Nover��ber 18, 20�16 ECI ['roji:c:t No. 3613 � time. The t�iicicness a3�c[ clistriE�ulion of ��edc7genic cfay clo�m t{�e entire ����ofile also inclicates that these soils formed cl�it�i��g a former wetler climate, mast lil<e�y cluring a major interg{acial. Color hues are in the 75YR E-a�igc, with 75YK cfay films. Clay films on pcd faces are fountl ��r-efe��e�itially in tl�c upper argillic horizon; the lo�n��r argillic horizons ha�e clay films on clast poc[<cts anc] coating cl�sts, �1�€�ese clay films vary from common �and thin to contin�ra�rs anc] lhir.f�, 5oil buriec� t�ncler fa«If in �rofile 3: 5 Blb5/SBtE�6/6Btb7/7[3Ch This is a coa�-senirig-downwarc! soil profile tha� ranges from sanc4y cl�y at the to�� to loani at die bottom. The profile is �t a minimum 67 cm thic[< at Station 1.2, where we describ�cl it, b�Et th�c1<ens eastwa��d, away it'or�i the [ow-angle fault clescril�ecf al�ove (at Station 3, the profile was at le�st 119 cm thicl<). T1ie bottom of this soil p��ofile extencls below the depth of ihe tr-e��ch, so these thicl<nesses are minimum values. Colors also vary with cle�:�th from I�rown to c�arlc I�rown (7.5YCZ 5/3 to 3/3) a! ihe top, [o light ycllowis�� E�rown to E���own (10YR G/�l to �/4) at tl�e E�ottom. Clay films in the u���er sandy ckay an�l sandy c[ay loa�n sections incl�icl� �nany madera[e1y thic[< on pccl faces, a��c! ina��y � to cotitin��ous moclera�ely thicl< to thicl< coafiing ciasts and lining clast ��ocic�ts. The soil ' formed in ai� originally coarsc-graine�l de��osil that inciudes many subro��ncled to sub�ngular Franciscan Form�tion-type c€asts ��p to 3 inches {7.5 cil�) in cliameter weatE�e��ed Lo Stages 2 l0 4. This sail a��pca��s to represent a repeated sc�ction of the o�erly'sng second buried soii descri)�ec� abo�e. As we s��ggested abovc, this lower buried sail app�ars to have heen '; removcd From tl�e eFfective c!e€�th of pedogenic influence by the fa��lting event, with ',� coE�ti��ued accu��iulation of translocated c[ay after the faulting occurring predominantly in '� tE�e ove€'lying soil and along the fault plane itself. To the east, closer to th� slope face, continued soil c3e�elo��ment, possil�ly e��hance�� by E�iott�rE�ation, obscurecl the fault p�ai}e so that it is no [onger visil��e in tha� arca, In th� ar-ea whcre we clescril�ed lhe soil, the deposit below the (ault was removecl fr-om the effecti�e cle��th of soil (o�'ination such that F�iiysical an�� chemical wea�l�ering of thc sa��cl fractio;� and/or inFlux of eolian sift ceased. This explai»s why this ��rofile is sancJier than the soil al�ove. IF this �tr'gumen[ is correct, thc estimated a�e of the entire seclion in this area is not re�resentecl by �he sum of the time it tool< for the su�-facc soil ancl each of the underlying three buried soils to form. fnstead, the age of the entire sectio�i is E�est re��resentecJ by tlze sum of the lime it toolc for the surface soil and each of �he first two buf'iecl soi[s to form, pfus the cliffcrence in age E�etween the secon�l at�c� third b��ried soils. 5oil developed in the �ond�d De�aosrts west of ihe fault in Trench T-�a: F3tE�1/[itb2Btb3/2 Bt4b This soil �[e�elope�l in what is inter'preted to have been a fining-u��ward se��uence of cle�n, well-sorle�l san�l deposited in a topogra�hic iow-s��ot that developed upliill from the Fat�lfi exposecl in the trench, pres��mably as a result of the inost recent earthq��a]<e event on the fault, if this is the case, then cstimating tlie age of this soil woulc� help estal�lish thc ti�r�ing of when this fault tt'ace last moved. This soil is o�er-lain by a 51-cin thicl< s��rf�ce soil com�arable to that desc��iL�ecl in Profile �. Tl�e cntire pr-ofile is 61 cm thicl< an�l incl�rcles fou�' argilf ic soi] horizoi�s that vary in texture from clay at the to��, to silty c�ay to sancly clay in the midc�le, anc[ sandy loa���r to sanc�y clay Re��o��t--Soil Straiigra�hic St��dy in Suppork of Fa�rlt It�vesfigation Page 8 San Luis Obis�o, California 17030 Naverr�ber 18, 2016 [Cl Projer,t I�o. 3613 loam at the bottom. Th� u��per horizons have 7.5YR I�ues and low chromas, wf�ere��s the lower horizons have 10-7.5YR h�€es. Cfay fi€ms �re c.omman in the �.�pper three hoi°izons, with few thicic a�id carnmon to ��any thin �o modera�ely tl�idc on �ed faces, common thin to moc[erat�ly thicl< coating clasts, anc] common i�ode��atel��thicl< lining clast��ocice#s. _ 3.2 f�EGiONAL SOIL 1h1DIC�5 USED FOlt COMPAT�iSOIJ PURPOS�S 11s Cliscussed �bo�e, we compifec4, reviewecl ancl analyzed se�eral soi) chroi-�osequ�t�ces that I�a�e I�ee�� clesr.rif�ed E�y othe�•s. In particula��, we lool<eci for soils develo�aed iii coast��l are�s of Califar'nia an�{ tf�e Baj�� Peninsula th��t at�e exF�osed to rnarine fog and thus sodiu��� influx, o�� the premise tE�at the soils at the site have be�n simila�•iy exF�osed to these coriditions, and as a result fia�e �levelo���cl n�ore quicl<]y tlian othet� soils from more inland areas that forr�ied i€� sin�ilar pat�ent rnaterials. To th�t enc! we fo�lnd and anllyzed clata for fout- coastal soil cr�ronosc�cfuenccs, Thes� i��cl��cle ]) soils formed o�� mar€ne tert'aces in t��e �iearf�y San S€meon area descriL�ecl f�y Rocfcwe!! ct al. (1994), 2) s�ofls th�t formcd on marine fert�aces on San C{eE�e��te ]sland �' clescr�if�ed by M��hs (1�8z), 3) soils thaE formec! o�i marine terraces in the Punt� 13at�da a��ca � of the 13aja Peninsul� (Rod<wc�ll et al., 19�37 ai�cl 1989, �ased on the s��mmary l�y Roc!<wel! � et al., i 993), and 4) sails clevelo��ed o�� af luvial (errar.es in the Vafle Agua �3lanca at�ea, also � ii� the #3aja Peninsufa, Mexico (iZocf<wel! et al., (993). � � � � For the San Sir��eon and San Cle��ente soils, we tool<the soil clescri��tians p��oviclecf in those � sou�'ces ancf calculat�cl thei�' soil i��clices (SDI and MH!) nor���alizecl to a total cfc��tf� of 200 � c��, The Rockwell et af. (1993) E�ublicatian covei'ing thc i'unta Banda and Vallcy Agua Blanca soils dicl noi i�ic.(ude incfi�id�ial soil clescri��tions, but they clici �rovicle the SDf and M1-II va[ucs ancl 'age estimates for the �ario�.�s ��rofil�s that tf�ey descrif�ed. [t is irrt��ortant ta note, however, that the soil inciices thlt Rocl<well el al. (�993) calculatec! and puf�lishecl for the Valle Agua Blai�ca ��ro�iles wer� normalized to a c[e��th ot 25d a�, anci we ha�e ass�m�ed that the same is true for the Punta Banc�a so€[s, although Rocl<weli et al. (1993) clo not say so. This is not expected �o have �n impact on fhe MHI vs soil age regt-ession cu��ves, as the di�gnostic, E�ette€� cEcvelo�ecl ho��izon tha! provides the MH[ v�lue is typically going to be found in the �t��pc�-200 cm, an�l MHI �alues are independ���t oF overa[1 profile ihicicness, but the puf�lished SDIs for-tl�ese soi[s will I�e higher il�an the SD€s nor-malized ta a depth of 200 cm. As a result, theoretic.ally, a soil age regression ��lot generatec! with SUIs normalizecl to Z50 crrt wi11 yie[d lower age estimates tha�� a regression generated with the same soil clata 6ut t�ormalizerJ to 200 cm. Our analysis sf-�ows tf�at tl�ere are significani diffe�-ences a�nong the soil indices cleve6o��ec! for fhese four soil c{�i'o��os�quences, Thcse differences are i{lustratcc! in Gt'a��hs 3 and �F below. Geaph 3 sliows the Soi! Develo��n�ent Index (5D1) versus Log Age for tl�e four individual soil chronoseq��ences analyzecf for this study, anci G�'a��h 4 sf�ows the Meaf� f-ioriza�� fnclex (MHf) vers��s i_og nge for ti�e same set of soif ��rofiles. The Punta Banda, Vailc ngua Blanca, Sa�� Clemente, anc! San Simeot� soils cfata as�e includec! in f�otl� grl��hs, with each clatasct shown in a different color, The San Simeon cEata we analyzec{ inclucles twclve soil profiles desc��ibed f�-om what Rocl<well et aL (T 994} inte���3reted as three separate ���aiine terraces {Qt5a, Qf5e, and Qt7). Although tl�e number of profi(es is relatively (arge, lhc ages of these sampfes a��c limi[ecl ta Repor-t—5oil StratigrZ€�h€c St��dy irE Sup�nrt of�ault lnvesfigation I'age 9 San L�is O�iispd, Califora�ia 17031 � � � i November l 8, 201(� l:Cl Project No. 36"13 ihi'ce val�ies, resul#i��g in a fairly liir�ited cfata se[ on the g�-a�shs used tar' our a�ialyses. We opted ta show and a�ialyze t€�� San Siirreon soils clata in two c4ifierent w�ys: �) as an average of t1�e SDI anc{ MHI values fo�� each ierrace (��in[< dataset on Graphs 3 a€�ci 4), a��c! 2) as indivitlual SDI �ncl MH[ values {I�lacic cl��t�set). Graph 3: Soil DcvelopEnent lndex (�Dl) vs Log Age for 5oils in Four Coastal Areas in California and [3aja Califos•nia 7 6 � � � �;j� -," � �i �;a � E e�� t � � � f . � �.�'; o � k�"� �°5 � ������ �� ,�'�:r ; � �=�r PunEa Banda(rh2-f).9U43} ;, . ,�m � ,,,x'�~ VaIlcAfiva 8[anc,t 4r�2-U.9a'08) �1 � ����, ��- San Cls�nien;e Sr^�-:U.4B97) ', ��° San Sim�n,Rvg.lCli(sh`l,-J.t1117} r � �� � �- $an Simcnn,Inci.C21(r�11==(}.{).��3�J 3 0 5D iQ0 950 200 � 5oit C]evclopmont lndexVafuc � Tl�e c��rves show �hat the Sa�� Clemente soils yield a [it�ear �-egression solution with a '�� negativc sloE3e, meani��g thai the ya�mgest so€9s clis��fay the strongest soil chai°acteristics. ''� I3eca�tse this result is contrary to inost observaiions that show an increase in soil inclices � wi�h increasii�g age, we chase fio not use tE�e Sa�� Clemente data to g�nerate the ', chronofunctions shown in Graphs 5 an�! 6. A[though not as obvious, the Soil Uevelopment ',[ lndices {SDI) calculatec! for the San Simean soils a[so yi�lc! negative slo��es (see Graph 3). '',� T€�is may E�e a f�it�ction of the rel�tivcly s���all age clata set; it is ��ossible that if a lar-ger '� spi°eacl of soils of c[iffereiit ages were available in i1�e r•egion, anc[ these were desc�-ibecf ancl ana[yzecl, the comE�ined res�ilts would i'esult in a direct co��r-elation between SDI ancl log soi[ age {meaning a �osi[ive slope for thc linear reg��ession eq�fation). fo�- the ��urF�oses of • t1�is �roject, however, we cl�ose to not use ihe individual San Si�neon SDI values to generate the chr-onofunction shown o�� Graph 5. Enterestingly, the averagec! MH] values foi' each tet'race in the San S�meon a��ea ��lot as expected, with a positi�e slope (sec pinl< fine in Graph �+). As a result, we lce�:�t and �fsec! the San Simeon average MI-II values in generZtitig the combinec9 MHI vs Log Age chronofunction show�i in Gra�h 6. Graph 4: Maximum Horizon Index (MHI) vs Log Age far Soils in Fo��r Coastal Areas in Califor��ia and [3a�a Califor��ia . Repo;�t—Soi1 Si�-atig�-aphic Study in Support of Fault In�estigatian Page 10 San Luis Obis��o, CalifoE-nia 17032 � � � i �lovember "I8, 2U16 ECI P��oject No. 3613 r �oiis in ruui�.uas�al/+rea� a � � P�k k /,('' Lx��.�" �-- h p (��^oF, G 'a �,� � � d A ♦ k E'� ,d`'"��4 P O F� � r'� x � F'unta f3antlt{e•�'?=U.879) e �'V�..e'i. ,,�°o r� '��: ~- Vallc�ua alanea[e^�::t1_7b2�� d �� �°' � ;�� -� San�Icmm�ic{M'?==fl.i3f7i) �`� ,;�� n '�f � San�imcon,Ave,`QS�r�2-{).77GG) � �� " � San 5€mcvn,lnd,f�t{!�'�-=i13107) a p.p p,2 0.4 O.S 0,8 1.Q Maximum Horiaon]ndex Val�e 3 a � a � � Gra�hs 5 (left} and 6 {rigi�t): C��ro��ofunctio��s Developed for tf�is 5tucly Using tl�e Punta C3anda, Valle Ag�ia [3lanca and A�erage Sa�� Simeon Soils Data (MH[ only) � Graph 5 shows the Soil Development Inc�ex �s Log Age, and :� Graph 6 sllows the Mean Hat'izon Index vs Log Age ;, These Fu��ctions wer-e usecl to calc��late esti���ated ages for the soils in t��is stuc[y, wit{� the res��lts ;� presentec! i�nder the colu�rrn "Combincc! f'B, VAB ��nd SSavg" in TaE�le T � � Regressipn Curve,MHE vs EagAge Regression Curve,S171 vs Log A�,e 7 (Eimited l7ataset) ' (limiled�ataseQ s � . .: e •• r , � W � o e �e� @ r,�� • �� C°5 woi.Iw�i 8 m� � � a a � � � ��W�• 4, i'� 4..'- . •� 4 6 a�a� Y-3.97'X+2,85 „ - d '� Y.�U.[�i�21'X-3.4JG � c 2-a,756 p r�+2�U.7797 �" � 3 g U.0 0.2 0.9 D,6 0.8 1.0 A 50 160 150 204 J�4�iqwm Horixpn lndex Value 5ail UeveCopment Index VaEue 3.3 �S�'IMATED SO�L AG�S BASED ON SONL INDICES foE�a�n� finaf analysis we usecl fou€' se�arate soi� chronofunctio€is �o estimate lhe ages of the soils �lesc�'ik�ed for this stucly. �hese ch€�oc�ofunctions inr,lude the Dolan et al. (�997) 5D1 Report—Soil Stratigraphic 5ttidy in Suppoit of Fault Investiga�ion Page 31 San Luis Obispo, California 17033 Noven��.�et� 1�3, ?01 G EC! Projert No. :��i13 ancl MI�I �1s Log Ag� regressions sl�own on Graphs 1 �i�cl 2, anc! the litriitecl cor��i�inecl d�ta fro��� lhe c�astal soils showi� oi� Grapl�s 5 ancl 6. We also irsc�c! tlie chronof�mclic�ns c�Elculated for ll�e Punta Ei�ncla anc! Valle Agua BI��nC:1 soil irtclic�s, since these soil r..hronosiqucnces ge��eratetl fairly rc�bust linear r��ressio�7s (see Gra�.�hs 3 anc! 4�). The res�ilts of these �nalyses are sui��rnariz�d in "I aE�le 1. The �alues ��i'esent��€ ii� Tab{r� "I reEsresenl [he leng[h of time tl�at cach of th� soils ii� a giver� E�rr.�file �vas exposed lo soil forrnii�g ��rocessc�s when �hat soil was at the gro��i�d stn�tacc�, �\s disc�rssed pre�io�rsly, all other cor7ditioE�s I�eing equal, coast��l soils are ex��ect�cl to clevelop fast�r th�n ia�lai�cl soils. Th��s, ��ve ex��ectecl th�xl the chranafunctior�s clevelo�:�ecl for tl�e P�mta Bantla, Valle Ag�.ia f�lai�ca t�€i�d ihc cor��l.�i��ed coastal soils clata would yi�ld ynu��ger ages for the Las Osos Valley soils than f�ie v�}lues ab�ained using th� Dolan �t al. ("f 997) reg��essioi�s. However, as Table 3 shows, this is i�ot the case. Wi�h �he cxc���.�tion af the surface soi] �(ro�n Profile 3, the Dalan �t al. (1997) re�ressions gener�lly returnec{ sigi�ificantly �ro�.inger �ges than tl�e �ther chronof�ri�ct3ons. Table �: Soil Develo��mer�f,4ge �sfimatcs Calculated fo�•tl�e Soil Profiles Describ�cf fur This Stuciy Mean Lengll�oi Time 5oi1 Was Exposec�fa at fhe Sfirface, based on thc Followi�ig 5ni1 Chronof�nctions: �oil M1�1 �DI Dolan et al, t-�mbined Pw�ta (n=200c�i�) (1997} PB, VAR, }3anda /Agua Rla�ica (A�g/MiE�) �5����} {this (this sfudy) (this stuc�y} stud ) Soil Profife l, 0.5164 40,793 / 14,014 79,�40 135,019 7b,�116 SuifacE 5oil 93.52 32,857/ 10,b5�3 1�7,76G 515,799 91,326 5oil Profiie 1, 0.�4814 33,513 / 11,37b 57,698 8G,784 55,573 13uried Sail l 93.63 32,916/ 10,677 128,32A 5�19,838 91,G57 Soil Profile 1 0.�093 22,348I7,��02 29,84�3 34,9Q0 29,067 Buried Sai1 2 72.67 23,524/7,576 55,89�4 117,�23 46,054 Soil Pr'ofile 2, 03591 16,851 /5,�88 18,863 18,508 18,504 Surface Soil 71.18 2Z,970/7,393 52,689 105,$36 43,856 Saif P��ofile 2, 0.�505 28,163 /9,462 43,488 5�,773 42,081 l3uried 5oil 1 9Q.0�3 31,099/ 10,Q76 111,519 �iO4,45G 81,599 Saif Profile 2, fl.4409 26,G83 /8,936 39,833 S2,Q04 38,600 Buried Soil 2 57.4 18,41i3/5,900 30,505 39,840 27,894 5oil P��ofile 3, 0.28GG 11,212 /3,563 9,724 7,4fl7 9,643 5urface Soil 56,7 1 t3,21�1 /5,833 z9,C�74 37,913 27,2[1 SoilP��ofile3, 0.5206 41,767/ 14,369 8z,55Q 3�12,379 79,04G 6uried Soil 1 75.71 24,462 /7,88�1 G1,574 139,84z �19,896 Soil Profile 3, 0.41�6 23,017/7,639 31,322 37,3Q5 30,�}72 i3ui�ied Soil Z 59.U7 18,9-I8/G,063 32,598 44,852 29,4G� Soil Profile 3, 0.4Z60 24,550/t3,177 34,755 43,127_ 33,783 8uriecl Soil 3 41.41 1d,255/ 4,541 16,183 12,822 16,500 Ponded 0.4255 2�,482 /8,153 3�,628 �2,853 33,633 Deposi[s 58.5 18,7�Ib 16,Q07 31,8G8 43,Q70 2f3,92Q A�ubreviations: MHI -= MZxi�ntim Ho��izor� Incaex; SDI = Soil De�elo�ment Incle�; PB = P�€nta Bancl�; Vnl3 - Valley Agua Blanca; SSavg= S�n Simeon, [errace�.�ve�-age Report-5oil 5traligr�pliic S[ucly in Suf�€�ort af Fault Investi�ati�i� Page 12 San Luis Obis��o, Califarnia 17034 f�ovemk�er t 8, 2016 ECI Project �lo. 3Gi3 �fli� Dolan el al. ("19J7) soi] age regressions inc[ucfe c�.n��es lhat capture J5% of tl�e d'a[a used to gene�-ate the cl�ronof�rnctio��. We typically use these c�ir�es �o calculate tf�e mi��imu�r� ancl r��axim�rm age val��es for a gi�en soil i��cfex, ancl on Table "i wc ����esent botf� the meciian �ncl ininim��m age ��lues calc��latecl using #I�e Do[an et al. (�997) regressions, 7�lie chro��of�iEictions that we gen�rat.ec! fo�- this study, such as those sho��m o�i Gra��hs 5 ���d 6, ia�cl��cle 95% conficl�nce inter�al (CI) enveloE�es a��ound tlie rr�ecii�n that delineatc the area wE7��'e tl�e li��ear regression equation that ��esl fits tl7e clata is likely to E�e: �ocated, i Tl�ese 9�% C[ enve�o��es, however, do ��ot ca��t��re 95% of the cla�a �.�secl, a��d are th��s not � co�n��arable to the envela��es shown ot� the Dolan et a1. ("I 997) graphs. Bec��ise we cli�l not � cle�efop similar enve[opes to c�pture 95% of the data �sed, all other val��es or� Ta��le 1 � rep€��sent median age estimates. G'sven that tE�e Dolan et al. (1997) r-eg��essions general[y � ret�r��ned the yau��gest agcs fo�� the sails desc�-il�ec! foi� this s[ucly, i# is o��r opinioi� tf�at the mini�num soil clevelo�ment age estimates wc calc��faficcl with lhese c1��-o��ofunctiotis rep€'esent the absolute ���i�7im�rm ag�s possible for'thcse �leposits. 4.0 D15CUSStON and SUMMARY OF RESUCTS Gi�en that the sur-f�ce soil desc�'il�ec! i�� Profiles �, 2 ai�d 3 is thougl�t to have develo��ed on eolian sedi�nents t€�at �Nere n�ost lil<e1y de��ositecl during the I�st glacial I71r"1X111`IUE1`I� ap��roximately 20- 301ca, tE�e soil cle�elo��ment age estimates calculatecl using tli� Dolan et al. ("I JJ7} ��egressions a�3E�ea�� provide the bes[ age estin�ates for these surf�ce soi[s. Cu�-the�-more, anc4 as discussed extet�si�ely above, the soil age reg�'essions in Dol�n et al, (1997} ret�rE� [he yo�mgest agi es#iirates Fo�' the soils we described in tf�e tr�nci�es. Since these soils are tl�ought to be exposec! to coast�l fag, and are thus lil<e[y to 1�ave fo�•�r�ed faster than inlancl soils, the yo�mgest ages seem �o l�e most ap��ro��riatc for this site. �fable 2 s�rmir�ai°izes o�ir preferrecl ages for the soils clesc�-ibec! for ti�is s[udy. O�n� p�-eferrecl age for the su3'face soi) is constrainetl between the minimu�n age r-etu€�necl by the Dolan et al. (1997) �'egressions, and the age of the eo[ian secliments th��t this soil forir�ed. Ass�Eming that these eoiia�� se�9iments bcgan to E�e c�epositecl wf�en sea Icvel Fe[i cluritig the fast g[acial maximt.itn, the soil cannot be ���o€�e than about 7 8,DD0 years old. Th��s, even though the soil regressions returnecl ages sigizifica��tly ofde�•than 7 B4ODD years, we optecl to caE� the age of the surface soil �n all ex��osures to "18,000 yea�-s. For tE�e E���riecl soils, we cf�ose to gi�e a range of ��ossible de�elopment ages that s�rctch fi�o��� the lowest a�erage ��e returnecl by tl�e regressions to the "miciclle of the roacl" �aliaes that do nat extencl into the 100,DDDs. In ��articul�r', we chose to igna��e the high age estimates retu�'��ed by the F'unta Ban�la SDI regressions. To obtain tl�e total minim��m age for a given ��rofilc, the develo�ment �gc est+mates for all of the soils in that profi[e wcre �cldecl togethe�', except for PE�ofile 3, whcrc the secorid burie�! soil was Er��ncated E�y faulting, ancl the ti�i�-d f�urie�l soil lilce{y re��resents a reE�eatccl sectio�� oi the second buriecl sail. ]n this c�se, we suggest that tE�e age of the entire profile is best represented by #he sum of the estimate�[ ti�r�e the s��rface soil and each of thc first two burieci soils were exposed to pecloge��ic ��roccsses, ��I��s the clifference in soil-clevcla��men1 age E�etwee�i tf�e seconcl ancl third I�uriecl soils. 1=ina�[y, the age of the ��on�lecl dc��osits is cfctcrinii�ed by adding the I�ngth of time that these sediments are [hought to have ��een exposed to soil-for��iing �rocesses E��fore burial, [�eport—5oil Stratigraphic Stucly in 5upport of Fault Investigation f'age 13 5an I_�€is OL�is��o, Califo�-nia 17035 � y � Noven��er 18, 2016 ECf t'rojec� No. 3fi�1 3 plLis tl�e agc nf the overlying s��rface soi) cle�elopccl in eolian cl���asits. We irsed our prefe����ec[ ag� of the stirface soi� from Profile 1, far this c�[culation. Acfclitional clisc�.issio�� rega��diE�g �he age af thesc soils i�asecl on thc:ir geologic E�ista��y is �rovicfed in �hc ��a��agra��hs E�efow, Table 2: Preferre�l /tgc Es�irrra[es for filroe �oils and Soil Profiles Described foE•this Sfudy Soil P�"��erret� DeveloE�n�ent Age of p�eferred Age of Profile INtdividttal Soil Soil ProfiEe 1, S�;rface Soil T 1,000- "(8,000 W� ^ i; Soi] Profile 1, Bur€ccl Soi� "1 33,OOd -87,000 _ Soil ('r•ofile �, 13�rrieci Soil2 22,Q00-35,04D G6,D00- �f40,000 Soil Pro(ile 2, S�srfacc Soil 1 G,d00- "[S,OUO Soil Profile 2, Buriecl Soil 1 2B,d00--59,000 5oii P�'afile 2, Buried 5oi1 2 18,000�-�0,000 � G2,�00-1 17,000 Soil Profi€e 3, S�€rface Sail 7,OOD- 1t3,000 � Soil P��of[le 3, B��ried Soil � 25,d00-83,U00 Soil P��afile 3, Buried Soii 2 1�J,d00-45,D00 Soi! P��ofile 3, T3uried Soi] 3 13,000-43,000 57,000- 14£3,OOQ =�' ;: Ponc€ec{ De osits 19,OOD-�3,OOD 30,000-Gi,D00 Tl�e first bu��iecf soil repi'eseizts the siab[e grouncl su�r(ace L�efore the last glacial maxima ex��aset! the c.ontinental shelf, facilitating burial !�y the ealian secliments in which the s�rrface saiG for'meci. This ��al�o s�:rface was composec! af allu�vial anc� allu�rial fa�� tle��osits that were gradetl to a mare c4istant coastline ihan today's, ��roE�ab[y th� M15 3 coastline of 30-6Q 1<1, but not im��ossibly tl�e � M1S 5a �t 75-F35 ]ca (especially conside��ing tE�ai this soil appears to 11ave formed cluring a dry �nt] f warir� climlte, such as MIS �a), �� q � The seconcl E�trrietl soil is local[y separatecf from the ove�-]ying soi! E�y a stoneiine, implying at le�st s some e�'osional lowcring af the second soil's grauncf sur(ace [�efore aE�cl while undct�going ;� ��edogenic wea�hcring. These cfe��osits co��lcl be MIS 5e, with s�i€�face stabilization occur��i��g cl�ring ; MIS 5c, or they cou1�E E�e as oltl as M1S 7 wi[�� the s�u�fac� lowering during MIS 6 ancl pedogenic � clevelopme��t occurring cf��ring the MIS 5 i��terva[s. � To conclu�fe, �here(ore, the s�rface soi) is a I�tcst Pleistocene to early Holoccne soil �le�elapecl on late Pleistocene (MIS 2 - ZO-30 I<a} eofian sands. Those sands blanl<et a ���[eosurface tliat fo��med ci�ring MIS 3 {30-50 I<a) tl�at is most lilcely con�posec4 of MIS 4 (60-IIO ]<a) se�[iments, whic9� in turn ;� overEi� a�� MIS 5 (BO-�20 I<a} €�aleosol de�e[opec! �E��on older �lluvial s�tliments. Tf�is wau1�E be tf�e ' ;i youngest age infierpretatEon for all the units. ;� ii ;I ;I ;i f l Report--Soil Stratigrapl�ic Study in Suppo��t of Fault lnvcstigation I'age �4 San Luis Ol�ispo, California � 17036 � i � November "]£3, 20"f 6 ECI Projec[ No. 3G13 W� ho�e that the irifor��nation pravidecf ak�ove hel��s ��ot� and teair� in furthez- cl�a��ac�erizing t1�e carthqua!<e history of this segm�nt of tf�e Los Osos fault. Thanl< you for tE�e opportursity to �issist you on this project. 5hou€cl you fiave any questions regard'€ng [he abo�e, please clo ��ot hesita�e to contact the ��nclersignecf �t(7�[�) �4�?_-265�. Res��ectfu{ly submiteecl, �ARTH CaN�ULTAI,ITS [f�1T�t�loJl1TIONAL, 1t�1C. Register-ecl Geologists and Certifiecl E��gineering Geologists �-�.` �� � �� � Tar�ia Ganzalez, C:CG 185�} � Project Cons�altan[ � Report—Soii 5it�atigt�aphic Study in S�ippoi t of Fa��lt Investig�3tion Page 15 San L�€is Ol�€spo, Califaj�nia 17037 'S � I�loven�ber 1 f3, 2{)"i 6 ECI P3'aject �o. 3G"E3 i�EFERENCES A�1D SOURC�S Eiirl<elancl, I'.W,, "1984, Soils ancl Geomorphology: Oxforcl U�iiversity Press, New 1'orl<, 372p. Birl«land, P.1N,, 1999, SOIIS af]CI GP017101'��IIOIDgy: �XfO(CI U1lIVC'f�51tY PI'C55, [nc., 3"j eclition, 430p. Bornyasz, M,S., and f�ocf�we[1, T.fC., 19�7, Tovvarc[s � rn�.i3tivariat�t analysis of over 1S0 datecl soils (rom c�ntra� C�alifornia to no�'thern B���a California, Geologica! Socrety of �l�nerica, Al�st��acis witl� Prograj�s, Vol. 29, No. 5, p. 45. EiL�rl<e, �.M., 5awyer, H.f�.A, I'hilli��s, E.S., Si���pson, G.D. and Mie]]<e, ].1.,, 20�6, The eolian deposit on marine teri•aces - a ��otential c[aling toal for coastai North Ameri�a, Geological Sa��iety of Ar��errca, A�stracts wi[I� f'rograms. Vol, �-�3, No, �; doi: 10."I T30/abs/"ZO"�6CD- 2 7�721 Dolan, J.F., Si�h, IC, Rocl<well, 7JC, G�.�ptilf, P., anc[ Miller, G., 1997, Active tec[onics, paleoscisi�ology, ar�d seisi�ic I�aza��ds of thc Hollywooc! fault, northern Los Angeles basin, � California: Geologieal Socie[y of America Bulletrn, Vol. "I 09, No. �12, p��, 1 595-"I 6T 6. ` I-larclen, J.W., �982, A quantitative €nclex of soil c�evelop�`nent from field cl�sc�'iptions: Fxat����les ;' from a chronosequenc� i�� ce�7tt'a] California: Geoderr77a, Vol. 28, pp. 1�28, ij ;i Harc[en, ).W,, and Taylor, E.M,, 1983, r1 c�uantitative comparison of soi) clevelopment in fo��r ;� clit��atic regimes: Quate�'nary Research, Vo[. 28, pp. 342-359. � 1-iar��ison, J.f3.j., McFadden, E_.B., Welclon, R.J., 1990, Spatial soil va�'iability in ff�e C�ja1 Pass �� chronosequence: lm��[ications for t�e use of soils as a geocf���ona{ogica[ tool: ! Geomor'phology, Vol. 3, pp. 399-416. � i Jenny, H., 19�F1, Factors of So€1 Farmation; McG��aw-Htlf, NewYorl�, 28�p. jk lCe[€er, E,A., JohnsoE�, D.I_., �oc�<we{1, T.IC., Clarlc, M.N., ancl Dem�roff, G.R,, 198�, Qualernai'y � stratigraphy, soil geo��or��hology, chronology and tectonics of tf�e Vc��tura, Ojai, and Santa ',( Paula areas, wesfiern Transverse Ranges, California; rn @riencls of tk�e Pleistoce�ie P�cific ,t Cell Fielc[ -fri�� Guiclel�oo]<, }uly I 987. ',I 'f Machet�e, M.N., 1985, Calcic soifs of tlie southwestern United States: Geological Society of Amer�ica Special P���er 203, pp, "]21. � Mcf=adclen, I_.D., 1982, The i��pacts of tem��o�'al ancl sj�atial c{imatic changes o�� �ill��vial soil genesis i�� southern California: Ph.D. Uissertation, Unive�'sity of Arizona, 430�. McFacic��n, L.D., and Wel�lon, CZ. IIi, �987, R7tes ancl processes of soil clevelopmei�i on � Qua[ernary traces in Cajon Pass, Califo�'nia: Geological Soriety of Ar��erica B+�Ileirn, Vol. � 98, ��p. 280-293. Muhs, D.�., 1982, A soil cliro�zosec�uence on Quaternary ma��i�ie tc��races, San Clemen�e fslancl, California: Geoderma, VoE. 2B, ����. 257-283. f2epoE�t-Soil Sfratigraphic Stucly in Support of Fault I€�vestigatso�� Page �(G Sar� Luis Obispo, Califo��nia 17038 $ , � 3 > �OVE'171�7�1' ��� 2fl��� ECI Prc.�ject No. :3G13 M�insell Color C harts, 2000, GreiagMacE�c:t11, 6�[7 Litt�e 13E'itain Rcf, New Wi€�dsor, NY 12553. National Soil S�i��vey Center, 2D12, 1=ield I3aol< for DescriL�ing anci Sam��ling Soils: U,S. DeE��rtmer�t of Agriculture, Natural Reso��rces Conservation Scrvice, Version 3.0. Orme, A.R,., 1�390, Late Quaternary coastal dunes of the Santa �1�t�ria area: A s��no��sis; ir� Leitis, W.R., Hanson, I<.L, I<elson, I<.f, a��d VVesling, J,IZ. (editors), Neotecto��ics o� south-ceniral coastal California: Fri�ncls af the Pleistocene Pacific Cell �9�0 Fal] Fielci Tri�� G�ic�el�ool<, ScptemE�c�'21-23, �990, J�p. 291-297. Ponti, D.J., 1 J85, The Quaternary a!{uviaf sec��tence of t�e Ar�telo��e Val[ey, Califo�-nia; Geological Society of A�»et'€ca S��ecial Paper 203, ��p. 79-96. Rockwell, T�, 1C, 1983, Soil c.hro��ology, gc�ology, a��c! ncotectonics of the north-central Ventura [3asii�, C�lifori�ia: I'li,D. Disser[�ttio��, Unive�-sity of Califo��nia, Santa Barbara, �24�. Rocicweli, T.!<,, �1988, Neotectoi�ics of �he San Cayetano fa��lt, C��lifort�ia: Geologrc'a! Society of ;�� Arirerica l3t�lletin, Va�, IOG, �a�. 500-513. � � Rocl<wefl, T,[C, Hatch, M.F., and Schtrg, D.L., 1987, L�te Q�rafiert�ary ra[es, Agua Bianca ancl � L�orcferlln�# faults: U.S. Gcofogicaf S�irvey, Fi�ial Technical Re��ort, Contrac( Na. 1�-08-0001- � 220�2, 122��. (not revicwecl fai°this st�icly) � I2ocl<wcll, T.I<., Johnson, D.L., I<elle��, i=.�. 1nd DemE�raff, G,R., "1985, A 6ate Pleistocene-Holoccne soil chronoseq�€ence ii� the central Ven[ura Basin, SoutEiern California, U.S.A; in Richards, I<., Arne[�, R. �nd EE{is, S., (editors), Geomor��hology znc� Soils; George Alle�i anc{ Unwin, ����. 309-327. 2ocl<well, T.IC., [Celler, E.n. ancl Clar�<, M.N., I�8�, Chronology and rates of faufting of Vcnt�rra River ;i ter�'aces, Cal iForn ia: Geolag�cal So�'iety of America Bulletir�, V�L 95, E�Ea. 1�66-147�. ',�� Rocl<well, T., Loug���ian, C., and Merif€e1cl, P., �990, Lale Quater�iary ��ate of slip a[ong the San '� Jacinto fault zone tiear Anza, so��thern C:alifornia: Journal ol Geoj�f�ysrca! Research, Vol. 95, No. BG, ����. 8593-8605. Rocl<well, T.1<., Muhs, D.h,, lCenF�edy, G.L., Hatch, M.E., Wilson, S.H., anc! 1<linger, R.E., 7 989, U�'aE�ium-series ages, f�unal correlations and lectoE�ic deforrriation of n�arin� terraces wiihin tf�e Agua Blanca Fault Zone at !'�.�nta f3anda, no��thern 13aja Cafifo��nia, Mexiro; i��Abbo[�, f'.L. teditar), Geologic Studies in Baya California: Society ot Econoir�ic Paleo�itolog€sts and Mineralogisls, Pacific Section, [3oak 63, �p. T-�6. Rockwell, T.�<,, Schug, D.L,, ancl Hatch, M.F., 1993, Late Quaternary slip rales along the Ag��a �3fanca Fault, I3aja C�tfifornia, Mexico; it� AL�l�ott, P.L., Sangi��es, E.M., ancl Rendina, M.n. (editors), Geologic (nvestigatians in Baja Cali�ornia: South Coast Geologicaf Society k�ieid Tri� Guit�e��ool< �elc! OctoL�er "f 6 and "f 7, t 9J3, pp, 53-�J2. � Repo€-k--5oil 5#ratigraphic 5tudy in Support of Fa�i�lnvest�ga[ion Page �7 Si311 LUIS OL�15�]Q� California 17039 November 1 El, �[}"I G ECI Pr'ojert No. 3G33 Rod«��cll, T,f<., Vaughan, P,R., Bicla�e��, F., ancl Hanson, I<.1_., �994, C:or�'elation ancl age estimates of soils �levelopecf in t��arine t�rraces ac��oss thc San Simeon fault zo��c, c�ntral California; rn Alter�man, L[3,, McM�rllet�, R.B., Cluff, LS., and S[emrr�oi�s, D.B., (editors), Seisr��oteclonics of ihe eentral Califart�ia Coas[ Ka��ges: CGeofagical Sac;�cty o( �1i��erica Special Pa��er292, p��, 15"f-166. 5hl�mon, R.J., "1978, Late Qu�t�rnary evolution of the Cair��:� Pendfeton -- San Onofre State Beach Coastal Areas, Northwestern 5an Diego Caunty, Californi�; Consulting repart for Sauthern Califarnia Ecfison Con����ny & San Dicgo Gas & Electric Co�n��any; puf�lishecl in Legg, M.R,, I<�rhn, G.G., and Si�le��on, I�.J,, (e�3itors), �.aaa, Neotectonics ancl Coastal I��stability � Orang� �ncl Northcrn 5a�� Di�go Co��n[ies, Ca�i{ornia: Joint Fieic4 Confc�t'ence Voluir�es, American Assor.iation of Netroleum Geologis�s, Paci{ic Sec[ion, ���c.! Society of PetE-ole��rr� Engineers, Wester�� Region, Lang [3each, Californiz, June "19-22, 2000, Volume II, pp. "I n3- 25T. Shlcmon, R.]., ancl Hamilton, P., 1979, Late Q�rat[;rnary rates of seclimentation anc! soil fo3�mation, CaE�p f'endleton - San Onofre State Beach caastaf a��ea, SOL1t�lP,l'� California; ��eprintcc! irt Fife, D.L., (editot'), Geologic GuiCle of Sa�� Onofre Nuclear C;enerating Station anc! �� � /ldjacent Regions of Soutl�ern Califor��ia: P�cific Sections AAf'G, S�PM �nd SEG, March 17, 1979, ��p. A�}7—A4n. Soil Su�'vey Staf{, i975, Soil Taxonor��y: U.5. Depaetment of Agriculture I-lan�lbool< #�436: U.S. � � Govern��ent C'rinting Office, Washi��gton, DC. � , Soil 5urvey Staff, 1992, I<eys to Soil Taxonomy: SMSS Technical Monogra��l� #�9: Poc�liontas � � Press, Inc., [31ac1<sberg, Virgin�a, 5th edition, 556��. Tinsfey, J.C,, Matti, J.C. ancl McFaclden, L.D., T Jn2, (eclita��s), Late Quaternary Pecfagenesis a��c1 � Alluvial Chrono[ogies of the Los Angeles �nci Sa�� Gabriel Mo�mtZins Area, Southcrn �� Califarnia anc! Holocene ra��[ting anc€ Allu�iaE Sfiratigra��i�y within the C��camonga Fault I� Zone: A P��eliminary lZeview: Guideboolc, 78th Annual Mceting of �he CorcfiUeran Section ; of the Geological Socie�y of/�merica, At�aheim, C�fiforni�, Aprif 19-2�, 7 982, AA�. ;; � ;� Report-5oil Stratigr•aphic S[udy ir� Support af Fac�lt Investigatioi7 Page 78 Sa3� Luis Obispo, California 17040 � Novemfaer �8, 20Z 5 ECI Project No. 3613 A➢�k'�f���9C �: S�B� ��tS��OP�a��l5 �o-�o�a9� I�c�. �H: ���s�s�l� �-�A, a�aib��a�S�a��fi�su �56, o�a �I�� �la��� 'J�/��0 ,�ep��a IF-llo�¢zos� aa�d I��g�w���e �hBcV<��ss P9v��o (a����� S�i� ➢��sco�a��=-on sa��-Eac� (c�ts) s�a1e) - �esugra��fiaras (�; ��) - `! SILTY CLAY; �ery dark gray (1 bYfZ 3/1) with very d�rk grayrsh brown f10YR�/2} cl�y --�=���� µ �p! tilms �a�hen dry, b�acl<{�flYR 2/1} with blacl< (10YR 2/1) clay fiims �vhen moist; strong ='i'�,.�=':=�=' t>��-�:�-:�.::: medi��m angular bloc3<y sail structure; extr�mely harcl whe� dry, vcry firm ��l�en moist, 0 - 0.75 23 ; A�t7 very sticky and very pl�stic when wet; continuous thici< clay films on ped faces, (0 -23) i _ �I comman to many moc�erztely thic!<clay films coating cl�sts, many thick clay films - - ' , S lining clast pockets; ��any fine and common medium raots; sca�tered fine �ravef; clear - ' �, wavv lowe��uo�mdar . ; '- =; - � � 51LTY CLAY; very clarl<gray and darl<brown (1 QYR3/1 and �OYR 3/3} �n��en dry, bl�d< �._-:,_:;--���:'.I � and �fery darl<brawn (10YR 2/1 and 7.5YR 2.5!3} when moist; strong mediUm angu[ar � -F � - blocl<v soil structure; extremely hard �vhen dry, firm �,vhen moist, very sticlry and very 0.7� - 1.41 Zfl � ,, �� . . -' AB�? plastic�vl�en wet; continuous tl�icl:clay films on ped faces, many moderately th"rck and (23 -43) '-��, :r: .�._; `';"` `` corr�mon thick clay films coating clasts, continuous t}�icl;clay filrns lining ciast pockets; �'�-ry`t'�-�"-'- � =�� common fine �aots; mix of Fl and L�t materiai; scattered fine gravel; cle�r wavy lower I �5�''"�.:; Lc �=,,�._�--* i boundarv. '�'-. -,.r..:=.�`.��' SILTY CLAY LOA��I; darl<bro�vn (7.5Y}Z 3,'3) when cl�y, clar�lc bro�vn (i.SYR 3/2) �vh�n ;��:�� � maisl; maderate fine su�angular E�locky�o granular sail structure; harci ta very lzard �"'�'`s''"��`.� when dry, very firm when moist, sticf<y and pfastic�vhen wet; fe�ti�thicl<and many to � . �__::ti: �'�� � �'g� ����'�"a`���:: 2Bticb con�ii�uous moderately thick clay films on ecl f�ces, comrnon mocler�te�y thicf<cl� (43 - 60) 17 :��,:..:._�,.a�,; p y' :-:-�:�v=`"_=� films coating clasts, few moderatefy thicl< c1�y films lining clast pockcts; {ew to N:-:i'.. ,._,•`1�;Ly. ���-����:�'r;�='`=�=: � � common fine roots; maderately thick calci�rm carbonate coatings on �ecl faces and as �'�y�?'='.�=_; «°, veins; clear irregular lo�h�er boundarv. G��':"r.T'="'T� �, SILTY CLAY; brown {7.5YR 4/4} with darlc brown (7.5YR 3/2) clay�ilrns when dry, dark k�� : ; a brown (%.SYR 3/3) �vifh very darl<I�rowi� f7.5YR 2.�/2) clay films�n�h�n inoist; moder-rtte '� �-,.��:i =� fine to coarse angular blocl<y soil striEcture; exti°ernelv hard�vi�en ciry, firm �vhen moist, �.97-?J2 '�k�,Ar�,....:�:�... ?3 - :�,, �] 3Btb very s�icl<y ancJ very plasttc when wer; fev�� thicl<and many moderately thick clav films (60 - 83) - - -::=>�y� on �ed faces, cnmmon mocierately thic]<cfay films coating clasts, many moderat�iy j thicl<clay filn�s lining clast pockets, fe�v thin clay films lin�ng �ores; con�mon fine _ -:�-_.�:__:';�.-'�, gravel; common medium pores; abrupt smooth ta�vavy lo�n�er bounciary. V O A ' Repai�—5oil Stratigraphic 5tudy in Suppor�of Fault Investigation �'age 19 San �uis Obispo, California November 18, 2016 CCI Pro�ect No. 3b13 ���Y� F9o�izoaa �s�s� C�eHaav the Tf�'ac�«sess ����o (�o��o ��09 �es�o'or�:Qo�a surrace (e�o) sea9�} {frt; �un) �ese��a�teor�s � i � �-= -=-:'�� 51LTY CLAY; brown {7.�YR 4/4} with dark browt� (7.5YR 3/2) clay fifms w�en dry, clark ��"�! bro�vn (7.5 3/3) �vith d�rk �rown (7.SYI�3/2) clay�ilrns �vhen moist; moder�te fine�o _ - �' � meclium subanguiar bloc]<y soil structur� breal<ing to moderate fine granuiar and single- ' grained; hard ��+�hen d�y,firm when rnoist, sticl<y and plastic when �vet; �e�v mocleratefy �.�2 3'�� 24 �- � " �� 4BCb t��icl<and common tl�in cfay 1"i[ms on ped faces, comn�on rnoderately thic]<and many (83 - 107) �--�"=� -. - �7 thin clay films caatin clasts comman moderately thicl< cla films linin clast ocl<ets; `�� Y g E� `'��-�� �vith pockets of clay;dev�loped on a different seclimentary unit�vtth scattered " ��,i�,' subangular and angular cob�[es, common subangular coarse gra�rel, and mare fine to _ ���:, �;•.,}�,.-=-� ` medium sa�d than L�nits above; a6ru t wavv lower boundar r. " ��=" = : :ts:ti; I SlL7Y CLAY; bro�vn fi.SY"R 4/4) tivith dark brown ({7.5YR 3/3 clay films when dry, ��'' brown (7.5YR 4/3} with darl<brovtim (7.5YR 3/2) clay filn-3s when moist; strong meditim -" ``�'' to caarse s��bar�gular blocky breal<ing to strong�=ine prisma�ic soil structure; very hard 351 -�.fl4 16 �7�� -,'��� �gt}�2 �rhen dry, firm when moist, very sticl<y and very plastic wf�e� wet; common �l�in a»d (107 - 123) � � '7���' fe�v moderateiy thicf< clay Films on ped faces, r��anv moderately�hic[< clay films coa�ing � ���;��F:.'� � ��� clasts, common modei-ately thick clay films fining clast pocl<�ts, commor thin clay �'�� - { !I fiims li��ing pares; scattered subangular�ebbles; few to common fine gravel; clear wavy p'���� I l�-.��'I lower boundary. "�'; SILTY CLAY; brown (7.5YR �/4) v��itE� �rown (7.5YR 4/3) ciay films �vhen dry, brown r� • .:� . (7.5YR 4l4) whem m�ist; moclerafe frne sul�angul�r blocfry soi! siructuee breal<ing to "��:,,��� s° single-grained; harcJ when c�ry, firm when moist, sticl<y and ver-y plastic when vvet; 4.04-AJ6 �2 ����- ��:� 58tb3 v common to continuous thic]<cEay films co�tirrg clast packets, continuous thin ancl � �ti {1?3 - 145) ,�5�.�,.,� '� �,,:_ s;.�._ , comn�on moderately�F�ic1< cEay films ]ining clast poc�Cets; soil d�velopecl on a matrix- I ��:-•�:� m Er;`:.�';:- _,�_.� supporied fine-grained muclflo�v deposit with scattered clasts up ta �� cm in diameter, 1 �'r�------".`;; I cammon subangufar �bbles and ravel; clear irre�ular lo�ver�ouncllr�. � ` 's`�`=`"� SiLTY CLAY to SA\�DY CLAY; �rown i 5YR 5/4) when clry, F�ro�vn (7.5Yf2 4l� when x..�-�.�- ::�; (�� ) `=""��t�-� :; moist; moderate fine to rneclium subangul�r bloe!<y soi3 structure breal<ing to granular :� �'�'J and single-grained; very hard when dry, firm �vhen moist, very sticl<y and v�ry plastic 4.76 - b.0i 40 - ~ ::-��lil SBtb� when wet; cammon to r�any moderately thicl<clay iilms coating clasts, continuotfs (145 - 18S) � `"`=•� thicl< c[a films linin� clast ockets; common clasts areater than 10 cm at Sta e 2 ciast- � �4: . .:�� )` � P � g r-� weathering; common fine gravel and common angular to sul�rounded pei�bles; ' ; loca�ized iran oxicle scainin ; clear frre ular lo�n�er E�oundal-y. V O N Report-Sail Stratigraphic 5tudy in Support af Fault Investigation Page 20 San L�ris Obispa, California November 18, 20�6 ECI Project ��Io. 3613 D��rt'� IF-0oa�dzou�auna$ �eV��nr�@ae �hac4c¢��ss �ho�� (ru���� S�¢B �es�u�¢p�i�a� s..s��aee (��un) s�all�) �y�sug�ai����us t€f; e�) � '; SANDY CLAY; brown (7.5YR 4/4) w-}�en dry, brown (7.�YR 4/3} �vhen moist; weaI< n..: medium subangular blocl<y soil structure L�reakinb to single-grain�d; harc[ when dry, �� frrm tvhen mdist, sticky and very plastic when wet; continuous moderately thic!<cfay 6.07 - 7.19 � � � films on clast pod�ets, many thin and cornmon mocleratefv thicl< clay films coatin 34 �.'„ � bBtbS i clasts, clay filrns on rocl<fractures; soil develo�ed on a cVzst-su�poi�ed, coars�r-gr�ined (1"05 - 279? ` mudflo�v depasit with clasts �0 -25 c��� in diameter, common subang�lar to ;- :�� ��. � subrounded co�bles and common fine gravel; most clasfis at 5tage 2 clast weathering, a ;�=.-�<c; few a�Stage 3; rac�ual irre�ular lower boundarv. � �� �T'"' � $ANDY CLAY; bro��vn (7.5YR 5i4) when dry, bro�vn (7.5Y�4/4) �vhen mois�; moderate ��"�.y..�...;.� fine to rnedium subangular bbclry soil struc'ture; slightfy hard to harcl and fragic when :��; -, , ;�� clry, firm wh�n moist, sticky anc� very �lastic w€�en �vet; comrno� lhin clay rilms o� ped 7.19 - 8.�6 "�.;�� faces, comman moderately thic!< clay fifms coating clasts, common thin clay films (219 -258) 39 ""-�`- �'�`�'6 lini�g clast pocl<ets, continuous ttiicl<clay films on clast pocl<ets; cammon angular to �, - - " subangul�r pebbfes, common fine gravel; abrupt smooth to wavy lower boundary to �-��� '_" serpentinite bedrock of the Franciscan Formation belo�v,to the bottom of the trench at -_ _.�.�_. :- `� ' a depfh of 302 cm. V O A W Repnrt—Soil Stratigrap�ic 5tud� in Su�port of Fault Investigation Page ?1 San Luis Obispo, California Vovember 18, 2a16 ECI Project I�a. 3613 Pa��ffi� I�lo. 2: ���s�ch T-�A, at�bo�n�5����o�u 3, o�a �he Soa��� �/�9i Deptf� �ei�w t�ae �➢�ickness PE��t� (not�0 9-�orozors a�ad Soa[ Descrs�ta��a ssar�c� (cm} scale) ��signations (fr�; c�n) SILTY CLAY; darl<brown (7.5YR 3/2} r,vhen dry, blaeI<(7.SYR 2.5/I) when moisfi; 0 - OJ2 22 A� moderate fine to coarse granular soil structure; exiremely harcl when dry, (a -22) extremely firm when moist, sticky and plastic�vhen wet; many roots and rootlets; clear wav lower boundar . SILTY CLAY; very dark gray (7.5YR 3/�) �vhen dry, black(7.5Yl�2.�/1} wl�en � r moist; moderate fine to medium subangular bfoclry to granular soii structure; OJ2 - 1.38 Za A2 �° extremely hard when dry, firm when moist, very sticlry and very plastic when t�Z -47] b wet; many roots; common to many medium sand grains and fine gravels; clear � i to radua� and wav lower boundar . � V' SILTY CLAY; very dark gray {7.5YR 3/1} when dry, black (7.5YR 2.5/1) when moist; moderate fineto medium subangul�r blocky to granu9ar soil struct�re; 1.38 - 1.90 .�6 B� very hard when dry, firm when moist, very sticIry and�ery plastic when wet; 42 - 8 � ( 5 ) common thin cla films on ed faces, fev� thin cla films caatin clasts� Y A Y g � common fine roots; many visif�Ie sand grains and fine gravels; clear to gradual wav lower boundar�. SILTY CLAY; very dark gray (7.5YlZ 3/�) with brown (7.�Yl�4/3} clay fifms when dry, b1ac1<(7.5YR 2_S/l} with brown (75YR 4/3) clay�iIms when moist; strong medium to coarse prismatic breaking to strong medium suf�angu�ar bIacky soi! � structure; very hard to extremely hard when dry, very f�rm when moist, very �.90 -3.a8 36 2Btkb � sticicy and very plastic w}�en wEt; common to many moderately tF�icl<and few (58 - 94) v thin c�ay films an ped faces, many tl�in and few moderately thick clay films ncoating clasts, common thin clay films lining clast pockets; many rootlets; Stage I to II calci�m carbonate Iining pores and as nod�les; common visible sand grains and small pebbles; abrupt wavy lower boundary o� a stoneline of rounded to subrou�ded ebb�es to cobbles. V O A A Report—Soi! Stratigrapl�ic Study in Support of Fault [nvestigation Page 22 San Luis Obispo, California Novemi�er 1�, ?U�6 ECF Project No. 3613 ���fi� �e4�w t9�e �C�aic9craess �P�of� (�n�f�� �Eor�a�co �nd Sop€ Sd]d"9a"ZC� ��QB'F� SC���� ��58bB"3�2�PO1tS ��5��'96QtHOPt (frt; C�n) � -- SANDY CLAY; brov�m (7.5YR 4/4) with darl< E�rown (7.5YR 3/4) clay Films �vhen I•�'.�:: �.-I � dry, brawn (i.51'R 4/3) w"rth dar!<brown p.SYR 3!3) clay Fifms when moist; ,�3'�"= }`��; weak fine to medi�rm subangular blocl<y soil structure brea[cing to single- „�...�- - � Q$ 4�� ;'��t,:r>; grained; slight�y hard and fragic when c{��y,friable�vhen moist, slightly sticky 37 -'�� � ��"�-;, 3Btb1 and slightiv plastic when wet; few t�,in clay films on peef fac�s, comn�on to � �9�- �3�� ��5��'�`� tnany moderate[y thic€< clay films caating ciasts, many tl�in clay fifms lining =-�$�''"= �- clasfi pocl<ets; sanc�frac�ion is �reclon�inanily imedium-to coarse-grained; many � '"��' .�. 'L I fine graveis and common pebbles weathered to clast-Ureathering Stages 2 to 3; ;._; - ��=;i='.; ' zones of in�reased Clav content; �raduai wa� 1ow�r boundary. � �;:',',,`i_�'`_�;� Clast-supportecl cabbly SAI�DY CLAY; brown (7.5YR 4/4) with �farl< bro�vn ;,,- (7.5YR 3/4) clay filn,s �-vhen ciry, cfar€; b��own (7.5YR�i3) �vith dark I�rovvn ��;.�� '��� � {7.5YR 3la) clay filr�s when moist; weal�fine suba«�ular blocl<y sail struct�ire "� .� breaking to single-grained; slightly hard when dry, friable when maist, non- 4.30 - 5.a9 �4 ',��""`'�� 48tb2 � sticl<y to slighCly sticl<y ancl plastic�,vhen wet; many to cor�tinuous moderat�ly (131 - �5�) .�� v t��ick ciay fiims coating clasts, rr�a�y to con�inuous moderately thick clay films i �i � linii�g clast pocl<ets; with f ne gravel and pebbEes L�p to 2.�-inches {5 c�i�) ii� � d��n�eier, felsic, subroundec€to subangu[ar, weatherec{ to clast-�veath�ring ,� . Stages 2 to 3; sand fracfion ic predominantfy mecli�.Em to caarse grained; clear � .. , wav lower bounda�v on a staneline. � -=�1;;,�' SA��IDY CLAY; darlc bro�vn (7.5YR 3/4) �vith clarl< bro�v�� (7.5YR 3/; clay films � _ and St lamellae when dry, dar!< bro�vn (7.5YR 3/4) wit� dark bro�vn (7.5YR 3/3) :;;;����":- c�ay films and Bt iamellae when moist; si��gle-graineci; sligntiy har-c� and fragic =! � , when dry, friable when moist, non-sticf�y and slightly plas�ic wl�en �vet(Bt lam 5.09 -- 6.27 • � • `". ° 36 �"''���r�•- � 5Bt �i� ' material); many to continuous moderately thick to thicl<clay films coating (155 - 191) �a°' �r�`�'_: ,� c€asts, many moderately thicl< clay films lining cfast pocl<e�s;tf�e gravel and ir�`�=``"�'' °`I ebbles are finer rained than aL�ove st�ban ular to subro�mded, weatherecl to ,,x�-. �.�:-_.::�:I P g , � �'-'�� , �� clast weathering Stages 2 to 3; E� la3mellae and zones af intreased clay are �+s�x:.� .. '�� 1 redcier i�� color 1�ut sti{! sin fe-grained; radual �vav lower-boundarv. V O � Report—Soil S�ratigrapi�ic 5tudy in Sup�ort of Fault lnv�stigatian Page 23 San Luis O�ispo, California �'�lovember 18, 2016 EC1 Pro ect I�o. 36I3 _ �ep��a &�eVe�w�&�e �'�a�c�c�oess Ph��o (�n���� C�omizo� a�dl S�iO s4��ae� (e�ru} sca➢e) �es�groa�ions �es����tie��o ��, ��� , ,�.`:";'t�.,_;;`,i �, SANL Y CLAY LOAM; dark Urown (7.5YR 3/�) with darl<brown (i.SYR 3/3) ciay ' �=;�" ;�'_;�';;,� films and �t lamellae when dry, very c�ar]<brown (7.�YR 2.5/3) with dar!< brown .::;, <_, '�:;;ar�;..-.�"�;`; (7.�YR 3/3) clay films and 6t famelfae when moist; single-grainecl; slightfy hard "�-' ' =�� tivFien dry, friable when moist, slightly sticl<y anc� sligf�tly plasiic when wet, �`�� - =? i many rnoderat�ly thicl<clay films coatinb clasts, rr�any to continuo�;s 6'2� - i'�.� 3b � :� � '' ' SBtiam2b moderately thicl<ciay films lining clas't pacl<ets; sand fraction is medium-to (1�1 -227) 3� „ . "d i � � � caarse-grained; fine �ravel and pebbles to 1-inc}� (2.5 cm) irr dia��eter, ro�3ncfed � � } ta sLEbangular, weathered to clast-weati�er'rng Stages 2 to 3; clear�vavy lo�ver �. . :=,,,,� ��� bo��ndary with anatl7er clast-supported mudflow unit with lit�le soil ��� '''� '--r deve�opment. This lower mudflow �epasit was no�describecJ. Belo�,v t]-�e � Y--'+:��=� . � _-`'- �� - mudffow de osit was bEdroc]<of tne Franciscan Formation. V O A °' Report—Soil Stratigraphic 5tudy in 5upport of Fault Investiga�ion Page ?� San Luis Obispo, Cafiiornia Novernl�er 18, 201 G ECI Project No. 351� 6'��paDe I��. 3: ��e�eV� �'-�I�, a����aa� 54�treoa� �.Z, �ev �Ih� RI�r@&a �IaV� �ep-tH� �.��'s U�e9ova���a� �h:c9c�aess �V���o (utoi[ �ilo�'ize�rn �s��➢ Smu9 �e���gac sa��fra�e (��) fo seaae) �esgp��ta�u� vr�e� �es��ip��a�c� (�t; crn) N�ra�e �:,;,��=�.i�;��.;.;Yw�`= SILTY CLAY L�AM; dark gr�yish brown (10YR 4-/2) whe� dry, very darl< , :'`' �°t�'•i`w'�' i r� ish bro�vn �OYl�3i2 �vhen moist; moderate to stron �o�rse .�;- ,�,�, g Y ( ) g � "�`'``' subangul�r blacky breal<ing to strong fine to medi�im granular soil structure; Q - 0.59 .. (0 - 18) �a - , '�� harc2 when dry, firm wf�en rnoist, ��on-sticl<y to sEightly sticl:y and slighYly i"�%�:- — pIastic when wet; common fine roots; scatterecl coarse sai�cJ to fine gravel; , `��' � , �° common fi ne to coarse pores; gradual wavy lo�ver bounc�arv. I_I- �a�T l � �J�a�7 SILTY CLAY LOAi�I; ciarl<grayish bro�vn {�OYR=�,�2) tivith bro�vn (�flYR 4,�3) � ._,,;..�.- . �.::�..�_:r�';;e,_ : ; � clay films when cfry, very c�arl; f�rown (10YR 2/2) �vhen mois�, strong coarse ; :�;'��;:..' f°' subangular b{ocl<y breal<ing to maderate r"ine granular soil struc�ure anci D.59 - 1.64 I..,_ ''__. . �1� �Q� 32 . ..� :.. . �;,... � A2/Bt� single-grained; slightly harcl to hard wl�en ciry, firm wl�en moist, s�icl<y and ��'.�` ::�-� �'� pl�stic when wet;few�hin clay films or� ped faces; rr�any roats; scattered �_:;' .- I coarse sand to fine gravel; common tine to coarse pores; elear smooth � `.- ! lower boundar . � � ; 51�7Y CLAY; dark grayish brown (10YR4�/2) wrth brow1n (10Y�4/3) clay � filins�vhe« clry, �ery dar!<gr�vish F ro�vn (10YR 3/2) �vhen moist; moclerate - .._ I coarse subangular bloc{<y soil structure; hard when r1ry, firm when moist, 1.6�-2.�-6 �`"` ' 26tb1 �LJ�i�S �ery stic[cy and plas�ic when wet; few thin cfay films in pores, manv thicl: {50 - 75) �'� =��'s��,�': �I � ,.% . � ciay fifms �aating clasts, many mader-at�ly tf�icl< clay filr��s [ining clast .• �.'� .... n :;�� � . , pockets; few fine roats; scattered co�rse sand to fine gravel; clasts are '��� � "�, � ° weathered ta weatl-�erin S�a es 3 to 4; clear wavv lower laounc�ar . �',`.��: I � � C�•, • '.;���' � SILTY CL.AY; dark gr�yish brawn (10YR 4/2) when dry, dar!<brow�7 {�OY� .���,:.•;� -� ty:�_� m 3/�} with very darl<grayish �rown (lOYR 3/2) clay films when moist; strong s�;�„ medium prisr5-Eatic soil strUcture; very h�rcl when dry, very firm v��hen moist, 2.4G -2.�J2 0 14 I 2Btb2 �Jnu�3 very sticl<y ancl very}�lastic when �,vet; continuoiis�hi�l< elay films on pecl ��s - g�] _ `, =�-3�'I faces, rnany moderately thic{< clay films caating clasts; common coarse � , . ,:����` ; sand and fine gravel, clasts are 4veathered to 5tage 3 to 4, few�'ine roots; �`_-}�'����-�� � ' clear wav to irre�ular lo�ver boundarv defined �v a ston�lin�. V O A " Report—Soi! Strati�raphic Stucly in 5uppart nf Fault lnvestigation Page 25 Sa�� Luis 04�ispo, California ;�ovember 18, 201 G ECI Project No. 3613 �e�tG� �C 6's be➢ow�9ae �'�u'sck�oess 1Pho�� (sa�� e-Vm�azon a�o� .Soa� �eo➢ogic sva-£ace (c:�o) t�s�a9e� D�SB�R�$HOT3 �J�si� �esc�i��i�� (Ff; ea�ui) Name _�...�,-•,„r--_ ::•-c�rx,:� �� Gravelly SILTY CLAY; brown (7.5YR 4/3) `n�ith �rown (7.5YR-�/2) clay filr�s II'�"k`�'i',�3 �' when dry, brown {10YR 4/3} with very dark gE-ayish brown (10YR 3/2} clay ��- �� �,- F=:;� ;�'�- ,�, films when moist; strong coarse angular blocf<y breal<ing to srror�g fine to - ��.,.-;;K:.., ;�:;I•;4;':,:;;t:.� m�dit�m anaular bloc�cy soi! structure at the cop ai�cl strong fine angular "`'•�:u�°'� blacky sail str�ucture at the bottom; very harci when dry, extremely firm ��g� - ���4 22 '. �` �`�':'�� �`i 3Bt1�3 when moist, ver stic!< and very lastic when wet� common moderately (89 - 17 1) . '� .;v>r. � Y Y !� � `x';�`�,:' � t��icl<clay films an ped faces; manv moderatefy thicl< clay films caating ����`"��''�-� clasts, conti��uous mod�ratel thick cla films linin cfast ockets; many ';���. ,-r.�; � Y Y' g P �"''"��",`•^�-" scattered fine�grave�wsized angular to subangular clas�s of Franciscan ��� ' =� �°^. Formation I�edrocl<weathered to Stage2 to 3; abrupt to clear�vavy lov��er 1.. ' �y.,y"1 ..� I ' � ' a boundar-. �';�u'.�-:��� � 51LTY CLAY LOAM; brown to yellawish brown (7,5-10YR 5/4) with brauvn ���"" � �� F4 f7.aYf� S/4} cla films when dr darlc ellovvish brown �10YR 4/4l w{�en �_,: ' ,�"�� ; -�4�:�� Y Y, Y _i�,,�,'.,,.: moist; maderate fine to mecli��m subangular blocl<y soil structure brea!<ing ` ,'�;"`�=�,�� ,�_ to single-grained; slightly hard when dry, Friable�ti�t�en moist, s[igl�tly sticl<y 3.G4-4.53 ��..."�r-'•�., •._ ;•,;i 27 �:,��4�.,�.,.; 4Beb�k and slightly plastic vJhen �vet; comman moderately��l�icl< clav r'ilms an ped {1 1� - �38} �;J�._�}. ._ , F;��-:,��;,��.;r_,: faces, continuous moderately thicl<clay�ilms coati�g clasts, cor,�tinuous `��Y�,�"'�� ; rnoderately thicl<tn thicl<clay films lining clast pocl<ets; scattered clasts �•`� :.,� � weathering to 5tage3 to 4; a}�rupt smooth lo�ver bounclary defined by a ��.'� , �.�. r�'��;.A_ faul�. ,�.,m., .��,..; ,, � P � '� SA�1DY CLAY; i�rown (7.5YR 5/3) �n�it}� brown (7.5YR 4/3} clay films when 3a cm ,��-x �� r4�; dr-y, darl<brown (7.5YR 3/31 �vith daE-I�brown (7.5YR�/3) clay fi[ms when s ,��e.�, .,�, , thick at ,.'��;'• � I :�.... �;�.�_:;b �,,, moist; �vea!<fine subangular blocl<y soi] structure i�realcing to single- 4.53 — Statron ;:�;=�;`�;;:_�''.;; — grained; t�ard to very hard �vhen dEy, very firm ���hen moist, sticl<y ancl 4.79 3+00, F �'' � "�'' SBtb5 "—' v�et� ���stic wi�en wet; many moderately thicl< clay�iIms on perJ faces, rnany (138— where '`�,,,:�• � c� moderately thicl< clay{ilrns eoating clasts, continuo��s ��oderately thick to I�ii r. 746) sam le ' -��`�� � I'� � t�icl< clay films coatin�cEast pockets; many scattered subrauncled to p ;��. ;,.�.::;::�,:..� ',_:..r.�' _ ca su6an L � +� was r ,�,y�,r� �'� � �lar c�asts up to 3 inchEs (7.5 cm) in ciiame�er consis�ii�g collected F ' -, �: preclorninantiv ar Franciscan Formation bedrock�veaYh�recj to Stage 3 to 4, ..��<��t ;., :.;..,. , ' i',�'-�r,�=':�=:-'.;'�_`? cI�ert clasis �veathered to Stage 1; 6rac�ual �vavy lo�,ver 1�oundar . � � V O � Report—Soil Stratigraphic Stucly in Support of Fault Inv�sti�ation Page 26 San L�ris Ohispo, California NovemE�er �8, 2016 ECI pro ect No. 3513 I�ep�� �.C�'s Ibe@�w�Eo� 'ri�3lCEC�le55 �h�a� (as�� II-�o�daoe�o �a��9 SoaB �e�V�g=.e sa��$ace (c�vo} to sea@e) �esu�rsa�B�ru �l�u�g �eseu��p��on ��, �s�) I �ilaav�e 3Q cm �r`"'=y":-�'�"�'��a SANDY CLAY LOAM; brown (lOYR�/3) �vhen dry and crusheci, dark thic]<at "��v`�`-`�I brown (7.5YR 4/3) wher� moist; wea}<fine s�E�angular bfocl<y soif structure 5tation �'� brea!<ing to singl�-grained; sEightly harc� vvhen dry, very friable to friable 3+D0 f ` " ' " tvhen moist, s:icl<y and plastic when wet; many r�ocferately t�ic!<clay films where ; `�; ��'"�LF` 5Btb6 on ped f�ces, continuous moderately�hicic ancl comrnon t�icl< clay fiims �=; , . _ ,��,�,: ..,;��-- � coating clasts, comn�on thicl<clay films lining cl�st pockets; scatrered ciasts � sampie �"�.;,'''�.� p2•edan�inantly of Franciscan Formation E�edrocl<that range from fine gravel �..f^ �t ���ti'��i�+��-':� l '�f^ �:J:.v �'Va5 1�i: :�I'i �,�.�����+,�-';; to 3 inches �7.5 cm) in diameter subroundecl to subangufar and bral<en, coilectec# „'�ti�;,w��;,,,; -_ � ' -- -==— weathered to Sia �s 2 to 4; abr�i t�vavv lower bnuncJary. . = �-• SANDY LOAM; yello4vish brown (�OYR 5/4) with (7.5YR 5/�} clav Filrris :._�:F•.: , IF�'�;�, '�"- ' when c�ry, brown (7.SYR�/3) when moist• massive breakina to weak to ;,' - �iF-� .� . , b r^�:, '� , mod�rate fine subangulai•blocl<y soil structure; sli�htly har-d vvhen dry, � friabie v��hen mo€s�, non-sticl<y and slightly plastic w�e3� wvet; fevv to ��:�V 1'�'��.5 i,�. .� 4.79-5.a4 �3 �.;..;�,;_`�:._�.`�:'I ���b_ common thin clay 1`ilms oi7 ped faces, comrnon moderately thi�l<ancl many �J�if 2 (1�6-I G9) „:;��;����-: �:,�'=`j thin clay filrns caattng clasts, many maderately thicl: clay films fining clast 1 f��.�_;;,.,,�;_� . ;�.Y,,:��, ��ockets; indurated; common fine to rrEedium gravel, common rnatrix- �'=.''�Y~�_:`'_ C"��"-° '-:�= supparted, s�rbangular fio subroundecf gravel and pebbles predominan�ly of � � Franciscan Formation bedrflclE, �veathered to Stages 2 -�, less Stage 4 �_�'�_�` �'�w weathered clasts than horizon a�ove; clear wav lower�ounciary. I �. LOAM; IigF�t yellowish E�rown (l 0YR �/�}when dry, bro�v� (l 0YR�/�) when F ;_>.: � rnoist; massi�e br�al<ing to moderate fine subangular blocky saiE structure; �,�-et ', �:�� hard when dry, friable when moist, non-sticicy and sliahtiy plastic when 5.54- 6.73 36 �.,�;� 7BCb ��i� B w�t; indu�'ateci,f2w SC3ttered fine�ravel up fo 2 in�hes (� cm) in d�ameter ���'9 `��� ; � consisting predominantly of Franciscan Formation bedr-ocl<we�thered to Stage 3; many manganesc oxide stains on parting surfaces; fractureci; lo�veE• �-�r ba�mdarv i�ot observed. V O � Repnrt—5oil Stratigrap�ic Study in 5upport of Fault Investigation Page 2i San Luis Obispo, California ,\overnber 18, 2d16 ECI Projec't !�o. 3613 ���'9C��C8 ����5ll� IPQ'��p�� �IVCS�����'�dIIBQ �'L ns� lf���u��a lf-�A De��f� �o�H�w.&se ��Oic9c�aess P�vo�� (aso� ��a�sz�o� s��£ace (cs�) �� sc��e} �250aC9d�FOil O�ese¢�€g��ioa� 1�$; CO71) T� � CLAY, darl< bro��vn (7.5YR 3/2) wi�h very darl<brown (7.5YR 2.�/2) and �rery dar!<gray - ' (7_5YR 3/1) clay films when dry, darl< bro�vn (7.5YR 3/2l v��ith darl<brown (7.5YR 3/3) and bIacic (7.5YR 2.5/1} clay films w}�en moist; strong coarse angular blocl<y soil structur2; �.67-2.30 �9 � gt�� very hard uvhen dry, very firrr7 to extremely firm when moist, very sticl<y and very pfastic {51-70) - - when wet; many thin and cammon moderately t}�ick to thicl<clay filn�s on ped faces, , common moderately thicl<ciay films coating cEasts, many maderately thicl<clay films ! lining clast pockets; many fine rootlets; scattered visiE�le coarse sand grains; clear irregufar lo�,ver F oundar . ; � . S�LTY CLAY to CLAY; dark l���own p.5YR 3/2) and very ciarl<gray (75YR 3/1) when dry, darl< brown {7.�YR 3/3) and I�lacl< (7.5YR Z.5/1) when moist; strong verv coarse prismatic � -$,.�,. - � �real<ing to strong coarse angular L�locky soil structure; �xtremefy }�ard�vhen dry, firm to 2.3D -2.99 �� ' "�,-�:�,,; - '-::�f I very firm wf�en maist, very st�cf�y and very plastic when we��; cammon to many (i0 - 97? ; ���=: :-•--:�'*+ ' Bt�� mocierately thick�nd feLv thicl<clay films on ped faces, cornmon thin to moderately thicl� .:;,a.>� •., k-•-� �-�:�"`� I�.:' ' c}ay fi{ms coating clasts, common moderatefy thicic clay films lining cl�st�ocl<ets; I _' F common r'ine rootfets; scatterecl visif�le medii�m ta coarse sancf grains; clear irregular ��*���,'` lower baundar h;�:- �._, 5lLTY CLAY to SANpY CLAY; darl: i�ro�vn (l 0YR 3/31 and black (l 0YR 2/�) �vith clarl< �. "=�'-,', bro�vn (75YR 3/2) clay fiims when dry, dark I�rovvn (10YR 3/3) anc� blacl< (1 aYf� 2/1} with 2.99 -3.31 I�/'t'-.`.., � darl<bro�nm (i.SYR �/3) clay filrr�s �vhen moist; moderate ��edium su�a�gular�locky soil �g� _ ���� 10 �`-.;.���:''w' Btk�3 structure; v�ry hard to extremely harc{ Evhen dry, extremely firm� when moist; sticky and '.�:-�„:�-.:'�_" very�lastic when wet; rr�any thin to mocieratelv thic[�clay fiims on ped faces, comrr�fln :4 � �°��-� thin clay filrns �ridging gralns, common tf�in clay films in pores; f�w�ir�e rootEets; some �`=`�=-�� �y fine ores; clear wavv lower E�oundar . �'.s�;; SA�iDY �OAM ta 5A1�`DY CLAY LQAM; da�•I<yellowish E�rown (10YR 3/5j with c�ar€< �� " ' yellowish brpwn to dar[� reddish brown (�0-7.5YR 3/�) clay films �vhen dry, d�rl<brown I �' ,� ..- � . . (10YR 3/3) �vith darl<brown (10YR�/3) clay films w��en moist; Ye�v peds ��vith incr�ased 3.3� -3.67 � `w�-'� - ' cla have ver �veal<fine suban ular bloelc soi3 structure breal<in to sin le- rainecf, most ;... � n Y Y � Y g g � 11 '"�,,''i 2Btb4 � (101 - 112) �;;'..,, ;F ��':r� sectian is single-grained; slightly harci when dry, friable when moist, nan-stici<y �nd +� � �:�:� sfigh�ly�lastic when wet; common thin and few moderateiy thid<clay films coaizn�cfasts; i ;k;-���;1 few scattered subangufar gravel to small pebbles; abrupt wavy low�r l�oundary to a � ���t'��r��="�-:� cobblv�ravel unit belo�v. V O o Report—Soil Stratigrap�ic 5tudy tn Sup�art of Fault Investigation Page 28 San Luis �bispo, Califomia :`�ovember 18, 2Q16 ECI Project tio. 3613 Sa�uaa�&�s o�AQ���ruu�� �o90e�$ea� �r��� �4/a99 ���I�� 1�A��i���a-lDay Du�case�G CG��s�rae[ (�a���i� lv�a�teru��) �esAaa�a�aar� P9�um�o (e�o� ��seG��n�ioe� 3o se�8e) Sandv Channel section -,'.� �,r:+::,;:,:Y LOAM; brown (lOYR 5/3) when dry, dark brown (16YR 3/3) w�hen moisf; modera't�fine s�ibangular�loc]<y ��=��.._c:�: soil structure; slightly }�arcl wher� c#ry, friable to firm when moist, non-sticf<y and slightly plasiic when wet; - � �t�`-�° carnmon fine pores; comrnon fine rootlets; visible mediL�m to coarse sancl grains. � -:?�;�..� . �..-�..�_.�.--� Gra��elly Channel section � "�� Gra�elly to Stony LOA,�tY SAND; 6rown (�OYR 4/3} �vhen dry, darl< brown t1 DYf� 3!3) �vhen rnoist; singl�- grained; loose wh�n dry and moist, non-sticl<y and non-plastic v��hen wet; many subangularfine gravel, � - pebbles and cobbles up to 4 inches (7fl cn�) in diameter; predominantiy mafic; sand fraction is fine-to � ` ' `� -� coarse-grained. �1- V O `� Repor�-Soif Stratigraphic 5tudy in Support of Fauft lnvestigation Page 29 San Lziis Obispo, Califprnia „,,,��,�o,�;s�,����mz����� EXPLANA71 O�f: 9 I I I I � I ! 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Piete 2 4 17054 6121120�6 DesEc�ri Maps Summary Repori ����� Design Maps Sumn�ary Report User-Specifi�c� Input Report Titl� Froom Ranch - Lower Site Tue]une 21, 2(116 23:4$:4o L1TC Building Code Reference Dacument ASC� 7-1Q Standard {which utilizes LISGS liazard data a�ail�ble in Z60H) Site Coordinates 35.�4805°N, 120,58614°W 5ite �oil Classi#icati�n Site Class E - "Soft Clay Soil" Risk Category I/II/III I � - - � s,�`���rs . t r- � �� j � � nprfgn � .��.1 l _ i _ � ^, a.� �,ipr.� ' � � �� . ���`x����� �, _ •� ,'����' ��'T'r � ,��' � . t ,� f � , " ' � a i I .r � . v � � �f ` ��s�ll LU13 OI315�70 � p . -` i P�4i t.li�llw ' j, y � ]7�I rli �-- - - f�F i-,F7 - - �{r�rl ' � �I, i _. � -. � � ,�, � Ld. �, � . .Y� �r '� �i t -�- a I�t.r. , ,r� ��nl�.il:,.., , . , . .i:i.lnl � Ri.�ii Ai:�,r�,r1 , r # ( 5, _ . 'I� + `f I i . ' � u `,�,C..,' � _ - _ +, � ���,�� �^^ '�.' � �i' "' c_I�' ,�,'z. . , �I+�,., t . '. `�� ' � '` ( ` _ . - ' �', � USGS--Prarrided Output �5 = 1.Z81 g S,,,S = �.�53 g SO5 = 0.769 g S1 � Q.484 g S��z � l..1.62 g SoL = 0.774 g For information on hova the 55 and SJ. values al�ove i�ave been calc��lated from probabilistic {r€sk-targeked) and deterministic ground motions in the directiort oP maximum hnrizonYal response, please refurn �a ti�e application and seleck the"7D09 i�I�HRP" bui3ding code reference document. N1C��Respanse ��ectrum f3esign ftesponse Sp+�ctrum 0.S^ 1.24 6.B0 1.Oa 0.72 U.9G- �3.64- �7.3t Q.�G � U.72 ST 0.18 � U.59 � 4,A� i�.,{g b.32 41.36 t�.2+1 eza a.zs aiz a.oa 0.UO 4.00 0,60 U,iq f�.d0 4.�0 d.80 1.04 I.2�i 1.4� 1.5d l.Sn 2.U� 0.00 U.20 �.4C� 0.6G U.a� 1.�}0 1.24 1.d0 1.60 1.5� �.40 Periad, T(sec} Periad, T(sec} For PGA,,,, T�, C,�s, ancS Cn, values, please view the detaifed report, /�IChaugh Chis information is a product of the U.S.Geolagical Swvey,�n�c provicfe no warranty,expressed or iinplied,as Yo Y.he accuracy of Lhe clata conlalr�ed therein.Tl�is tool is i�ot a su6sLiCuLe(or tecr�riical subjecC-inaLCerla�4�rlledge. 17055 hitp:llehp�l-earlhquaKe.cr.usgs,�ovld�siynmapsluslsum m ary.php?lem pl ate=m inimal&I atitude=35.24805&f ongilude=-120,6B6'f 4&s ileclass=4&riskcateyory-0&ed.. 1/1 6121I2016 Design Maps Detailed Repori � Design Maps Detailed Repor� ASCE 7-10 S�andard (35.24805°N, 120.686�.4°W) Sike Class E — °Soft Clay Soi{", Ris{< Category I/II/III Sectio� 1�.,4.1 -- Mapped Acceleratio� Parameters Note; Ground motion values provided below are for the direction of maximum horizontal spectral response acceleration. Tl�ey have been con�erted From corresponding geametric mean ground motians computed by the USGS by applying Factors of 1.�. (to obkain SS) and 1,3 {to obtain Sl}, Maps in t}�e 2010 ASC�-7 Standard are provided for Site Class B, Adjustments far other Site Classes are made, as needed, in Section 1 J..4.3. �rom �i�ure 2�a1 �17 SS = i.281 g From Figur� 22-2�Z� S1 = 0.48�+ g Sec�ion 11.4.2 — Site Class The autF�ority having jurisdiction (not the USGS), site-speciFic geotechnical data, and�or the defau[t f�as cfassified the site as Site C[ass �, based on the site soil pro�erties in �ccordance with CI�apLer 20. Table 20.3-1 5ite Classifica�ion Site Class vs N or IV�,, s„ A. Hard Rock >5,000 Ft/s N/A N/A B. Rock_�._..______..�.�._�.__.____�.�___--2,500...to 5,000_.fus_._.�_._NIA_�.,___._._.�._W NIA_�.�_�...._.__ C. Very dense soil and soFt��ock �� 1,200 to 2,500 ft/s ��� �50 >2,000 psf D. Stiff Soil �mm� � �W_.�_.���W-�600 to �,200 Ft/s �� J.5 to 5Q � 1,000 to 2,000 psf ;; ..�.�._�._..�---._�.—..__._...___.__._..______v__.._..._._r�.__._.�.___.��_��..__,___..u__..�__.___,_._ � �. Sof�day sofl �G00 ft/s <�.5 �1,000 psf � Any proFile with more tl�an id it of soil having tl�e cha racteristics: ;i n Plasticiiy index PI � 20, � e Moistu��e conCent w >_ 40%, and . Undrai��ed sF�ear strength s� � 500 �sf �.�----_�_�.__.__---_.---.- -__._.�____._--_---_ ._...�..__.._.... F. Soils requiring site response See Section 20.3,1 analysis in accordance witF� Section 21.1 '� For SI; 1ft/s = D.304B m/s �fbJfk2 — 0.0479 I<N/m2 , i 3 � 5 3 �7 I � 1 � � � � � 17056 http:llel�pl-earthquake.cr.usys.govldesignmapsluslreport.pl��?template�minimal&Iatitude-35.24805&longitude=-120.686i4�sitec[ass=4&riskcaEegory=0&edi�io,., 116 i 6121I2b�[6 Design Maps Defailed iteport 5ecrion 11.4.3 --- 5it� Coefficients ancf Risk-Targetecf Maximum Considered Ea�thquake (M,C�R) ', 5pectra[ Response Acc�l�ra�ion Parame�ers Table 11.4-1: Site CoefFicient f� Site Class Mapped MCE R Spectral Respor�se Accelerarion Paramete�'at 5hort Period SS 5 0,25 SS � 0.50 SS � 0,75 SS = 1.00 SS >_ 1,25 A 0.�3 0,8 0.8 O.B 0.�3 g i.o �.o �.o �.o i.o , c i.2 i.2 i.i i,o i.o D 1.6 1.4 1.2 1,1 �.0 E Z,5 1.7 1.2 0,9 0,9 F See SecYion 11.4,7 oF ASCE 7 Note: Use straight-line interpolation for intermediate�alues oF SS Far Site C[ass � � and SS = 1.28i g, F� � 0.9GG Table iL4--2: Site Coefficient F„ Site Class Mapped MCE R Spectral Res�onse Acce{eration Parameter at 1-s Period S1 � 0.10 Sz - 0.20 Sl = 0.30 51 = 0,40 S� ? 0,50 A 0.8 0.8 0.8 0.8 O.II B 1.0 1.0 1.0 1.0 1.0 C 1.7 1.6 1.5 1.4 1.3 D 2.A 2.0 1.B 1.6 1,5 E 3,5 3.2 2.8 2.4 2.� F 5ee Section 11.4.7 oF ASCE 7 Note; Use straight-line i[�terpolation For intermediate values oF SI Far Site Class = � and S€ = 0,484 g, f-„ = 2.400 17057 E�tlp:llehpl-earthquake.cr.usgs.govldesignma�sluslreporf.php?tempfate=m inimalRlatitude=35.24II05&4ongit��de�-120.68G14&siteclass=A&riskcafegory-08,editio.,. 216 6/21/2016 Design Maps Qetailed Report �qu�tion (�7..4P3.): St,�s — Fa55 = 6.966 X 1,Z81 = 1.153 g Equation (11.4-2): Sr�i = F„51 - 2.400 x 6.484 = 1.162 g Section 11.4.4 — Design Spectral Acceleration Parameters �qua�ion (5.1,4--�): Sos = Z/ S�:�S = 2/ x 1.153 = 6.769 g �quation (1.3�,4�-4). Sol = 2/ 5�,1 = �/ x 1.1G2 � 0.774 g Section �.1.G-.5 --- Design Response Spectrum From �igur� 2a-�:�C3� Tt = 8 seconds Figure ��.4-1: Design Response 5pectrum 7�T�:SA6�P9��.4a'�.BTITo� 'F �TST `S m8 �ni=0.7G9 _._s _. - o s' u os ' �, ��;-0.7G7 ' ` � � , , <TST'�:So=-So�IT � � � � � a ; ; T� ��p'�DiT�.I T� � , r � � L � � � 1 � u I ! � 1 � � f Y � f � H I 1 C f E a � � p, i � H I Y � I 1 � I � p I � � I ! � I ! y I f a � � � I 4 ! � I E I � I 1 1.�D� Ta=�.2Q1 � T�=1.Dd3 Perio+f,'T(sec) 17058 Mtp:llehp1-earfhquake.cr.usys.govldesi gnm apsluslrepor Lphp'ltemplate=m inim al8�fatitude=35.248058�1ongi tude=-120.6B614&s iieclass-A&rislccategory�0&ediii o... 31G 61211201fi Design Maps Detailed Report Sec�[on 11,4,6 — Risk-Targeted Maximum Considered Earthquake (MCER) Response Spectrum The MCER Response Speclrum is dekerm€ned by multiplying the desigi� response speckrum above by 1.5. S,,,i=1.3.53 -_ pi ��=1.Z5Q T i i � i � � I i I 1 C � � p I � y� I 1 �0 i 1 � i t d � r � , , u r i � 1 5 a 4 Y N F S � F Y p I 1 a � � � # , � s � ; , � r i � t i � i y s r C, � � � 3 � i t 1 Y 1 1 E I l.�d� T�=0.201 T;=1.403 Perind,T(sec) 17059 ht1pJlehpi-earlhquake.cr.usgs.govldesignmapsluslreport,php?lemplate=minimal&Iatitude=35.248D5&longitudeW-120.68614&siteclass=q&riskcategory-�&editio... �+IG S i 6/21/2016 ilesign Maps Detailed Report 5ection ii�6 — 5eismic besign CategoTy Table 11.6-:L Seismic besign Category 8ased on 5hort Period Response Acceleratian PaE-ameter �is�c cAr��oRv VAL.0 E OF Sos I or T� III IV Sps C 0,1B7g A A A 0.167g � Sos C Q.33g B I3 C 0.33g 5 Sp$ C 0.60g C C D O.,ri09 � �ds d D D For Risk Categoiy = I and 5ps � Q.769 g, 5eismic Design Categocy � D Tahle 11.6-2 5eismic Design Categary Based on 1-S Period Response Acceleration Parameter RisK cAr�ev�v VALU� OF Soi T or Ir ITI IV S�1 C 0.067g A A la 0.067g 5 Sol C 0.133g B 6 C 0.133g 5 Spl C 0.20g C C D �.ZO� C SD1 p � D For Ri�lc Category � I and 5px = 0,774 g, Seismic Design Categpry � b Note: When S� is greater than or equal to 0.75g, the Seismic Design Category is E for buildings in Rislc Categories I, TT, and III, anc! F for those in Risf< Cateyory IV, irrespective of the above, Seismic Design Category = `tthe rnore severe design category in accordance with Table f3�.6-1 or X1.b�2" = D Note: See Section I1.6 For alternative approaches to calculating Seismic Design Catagory, References �.. Figure 22--1: http://earthqual<e,usgs.gov/hazards/designmaps/downloads/pdfs/2010_ASCE-7_Fig�re_22-1.��dF 2, Figure 22-2: f7ttp://earthquake.usys.gov/hazards/designmaps/down[oads/pdFs/2010TASCE-7_Figure_22-2,pdF 3, Figure 22-�2: http://earthqual<e.��sgs.gov/hazards/designmaps/down(oads/pdFs/2010TASCE-7�Fig�ire_22-12.pdF 4. Figure 22-7: http://earthquake.usys.gov/haza�-ds/designmaps/down[oads/pdFs/2010_ASCE-7_�iyure 22-7,pdf 5, Figure 22-17: http;//earthqual<e.usgs.gov/hazards/designmaps/downloads/pdFs/2010_ASCE-7 Figure�22-17.pdF 6. Figure ZZ-18: http;//earthquake.usgs,gov/hazards/designmaps/downloads/pdfs/2010_ASCE�7 Figure_2z-]S.pdF 17060 hifp:llehpl-earihquake.cr.�isgs.govldesigi�mapsluslreport.pf�p'?leinpiate=minimal&latitude=35.24805&lonc�itude--120.G8G1A$siteclass=4&riskcalegory�0&editio... G16 6/21/2016 Design Maps Detailed F�eport Sectian 11,8.3 — Additional Geotechnica! Investigation Report Requirements for Seismic Design Categaries D through F Frorv� Figure 2��7 �g� PGA - Q.54�. Eq�atian (�.1.8--1): PGA�� = Fp�APGA = 0,900 x 0.541 = Q.487 g Table 11.8-1: 5ite CoeFficieiot FPc,, Site Niapped MCE Geometric Mean Peak Ground Acceleration, PGA Class PGA _< 0.10 PGA = 0.20 PGA = 0.30 PGA � 0.40 PGA ? 0.50 A 0.8 0.8 Q.8 0.8 6.8 g z.a 1.o f.o i.o �.o c �.� �..z Y.r i.o �,o D �..6 1.4 1.2 1.1 1,0 E 2.5 J..7 1.2 Q.9 0.9 F See Section 11,4.7 of ASCC 7 Note: Use straight-line interpo[ation for intermediate values of PGA For Site Class = � and PGA = 0.54�. c�, �p�n � 0.900 Section 21.2.�.1 — Method 1 (from Chapter 21 - Si�e-Specific Ground Motion Procedures for Seismic Design) From Figdire 2�-17�5� CRS = 0.902 �rorn Fiq�re 22-��3�6� C121 = 0.939 17061 htlp:llehpl-earthyuake.cr.usgs.govldesignmapsluslreport,pi�p?le�nplate=mini�nal&Iatitude=35.24�05�longilude=-120.68614&siteclass-4&riskcategory�0&editio... 516 6121I2D1G Design Maps Summary Repori ���� Design I�iaps Surr�mary R�port User-Specified Input fte��rt"Title Froam Ranch - Upper Site Tue]une 21,201b 23:46:53 UTC Builc#ing Code lteference Documer�t ASCE 7-1D Standard (wtiich uLilizes USGS Y�azsrd data available in 2008) Site CoordEnates 35.245�5°N, 120.68614°W Si�e Soil Classification Site Class C-- "Very Dense Soil and Soft Rock" t2isk Category I/II/IIT �� � ,. ��n sp�; ;i { _ ��� - _ �'� '9 t A C� e Y i i �51 �F�rF +l� .?:� � '��i � �'U . .r . j .� � - �� �+ - . ' '' � � ., , L . .� . � ,� � , ���nl.ui��l�isqc� ... r,., ,.�,;�i,: . ' r .�rF�n . nF„�n � -i I y. . � �� '�" �. � .�.. 0 ;'�....�i . -�,�n I iii-.�'r� � I .. - -F.I�I � ( �i.ni?.i�l�r�r1 . 1' , , � � ' , ' ' � , -�� �� ',�A� -. . � i „a-`�-- �r - _ ° ' - I `"'�� �"��, » ' ' � r-� '�� �, �r � �rA � . �C !` � :��.�'`�t_;' ' � � ,� -� - ` a - +, - - . � I • USGS-Provided �utput S$ � 1.281 g a�as = 1.281 g Sps � 0.854 g �z = 0.454 g 5r�11 = 0.637 g �p� = 0.425 g For information on how the 55 and 51 values a6ove have been calculated from probabilistic (risl<-taryeCed) and deterministic ground motions in the direction of maximum horizontal response, please return to the applicafion and select the"2449 NEHRP"building code reference document. MC�R ft�spnnse 5p�ctrur�n f�asign Respc�nse Spectrum 1.J3 0.�5 1.34 0.9�] 1,17 �7.81 4.t7a �.+� 0.�1 �7.G3 � U.78 Ci 0.5d � �7.65 � 0.45 U.52 0.3G 0.39 �7.27 0.26 6.L2 0.13 Q.09 G.f10 �1.�k7 0.60 0.29 fJ,bO 9,60 9.90 1,09 1.30 L.Su 1.6Q 1.30 2.06 d,00 p,�0 p.dp Q.Gp 0,$p l.Op 1.2U 1.50 1.64 3.86 2.00 P�riod,7(se[} Periad, T(sec) For PGA�.,, T�, CRS, and C,�I values, please view the detailed re�ort. AlChough thls info3�mation is a�i-pducL oF Che U.S.Geoloyical S�3rvey,w�e pr�ovid2 no avai�raizty,expre�sed or impli�o,as to the accuracy of the da�a contaVned therein."fhis tool is noC a s�ibskitute For teciinical subject-rnatter Itna�Nletlge. 17062 http�!leh��1-earlhquake.cr.usgs.govlriesignmapsluslsunimary.php`?template=r:iinirnal8�lalifutle=35.24805&longitude=-120.68614&siteclass=2&riskcateyory=0&ed.. �i11 { 6l2112016 Design Maps Detai[ed ReAort � Design Maps De�ai[ed Report ASC� 7�10 Standard (35,24805°N, �20.68614°W) Si�e Class C -- "Very Dense 5oil and SoFt Rock", Risl< Category I/TI/TII Sectian ii.4.i --- Mapp�d Acc�l�ration Param�t�rs Note: Ground motion values provided befow are for the direction of maxitnt�m horizontal specEral response acceleration. They have been converted from corresponding geometric mean grouncJ motions computed by the USGS by applying Factors of 1.1 (to obtain SS) ancl 1.3 (to obtain S,). Maps in the zOld ASC�-7 Standard are Qrovided for Site Class B. AcJjt�stments For other Site Ciasses are made, as needed, in Section 11.4,3, �rom Fie�ure 22^^1 �1� SS = 1.281 g �rom �ic�ure 22m�C�� S� = a.484 g S�ction �.�..4,2 — Site Class The autharity having jurisdiction (not the USGS), site-specif€c geoteci�nicaf data, and/or the def�ult has cfassified the site as SiEe Class C, based on the site soil properties iiz accordance with Chapter 20. Table 24.3--1 Site Classi€ication Site Class vs N or N�n s„ A. H ard Rock >5,000 Ft/s N/A N/A B. Rocic .__�m.__._..�m___.._._._ m_T_._2,5D0 to 5,000 FY/S__.�.�N/A�._.�..__�.._..._._._N/A�_.___.�._. C.�Very dense soil and sof�rock ` 1,2D0 to 2,500 FtJs�� � �50 � �Z,000 psf �� D. Stiff Soil � �� mm T � � 6DD to 1,200 FtJs 15 to 50 1,000 to 2,000 ps€ E. SoFtclay.soi6��____ _..__._..�_.�_.�___.�_._.__.c600 ft/s --_.�_...______�15�.u.__.� �1,000 ps€_�___. Any proFi[e with more than �D ft of soil having the cha�'ac�eristics; . Plasticity index P.I� 20, a N�oisture content w ? 4D%, and . Undrained shear slrength s„ < 500 psF ^�. Soifs requiring site.response � v See Section 20.3.1 ana[ysis in �ccordance with Section 2�.1 For ST: ift/s = 0.3048 m/s 19b/ft� = 0.0479 kN/m� 17063 http:l/ehpi-earthquake.cr.usgs.yovldesignmapsluslreporLphp?iemplate=minimal&lati tude=35,24805&I ongilucle=-12D,6Bfi1 A&si tecl as s=2�ri skcategory=0&etlitio... 11G 61211241b Design Maps Detailed Reporf ; Section �.1.4.3 - Si�e Caefficients and Risk-Targeted Maximum Cansidered Ear�hqua{<e {M,CE.�) � Spectra[ Res�onse Acceferation Parame�ers Table 11.4-1: 5ite Coefficient Fa Sita C[ass Mapped MCE A Spectral Response Acce[eration Parameter at Sl�ort Period SS � D,2� SS = 0.5D SS = OJ5 SS � 1.D0 SS ? 1.Z� A 0.8 0.8 O.B 0.8 0.8 B 1,0 t.0 1,0 1.0 1.0 C l.z 1.2 1.1 1.0 1.0 D 1.6 J..4 L2 1.1 1,0 E 2.5 1 J �.2 D.9 0.9 F See Section 11,�.7 of ASCE 7 NoEe: Use straight�line interpalation for intermediate values of SS For 5ite Class = C and SS = 1.2f31 g, Fa W 1.000 Table 11.�4-2; Site CoePficient F� Site Class Mapped MCE R Spectral Response Acc�leration Parameter at 1--s Period S1SD.10 51 = 0.20 Sz � 0.30 51 = 0.4D S, ? OSO A O.B D.8 0.8 0.8 O.B B 1.0 1.0 1.0 1.0 �..0 C iJ 1.6 ]..5 1.4 1.3 D z.4 2.0 1,8 1,6 1.5 E �.5 3.2 2.8 2,4 2,4 F See Section 11.�4.7 of ASCE 7 Note: Use straight--line interpafation For intermediate values of Si For 5ite Class = C and Sx = 0.4f34 g, F„ � 3..316 17064 http:/lehpl-earthquake.cr,usgs.govldesi gnmapsluslreport.plip'?[emplate=m i ni m al&f atilude=35,2q 805&I onyifude=-120.68614&siteclass=2&riskcategory=0&ecli tio... 216 612 112 0 1 6 Design Maps Detai9ed Repori �c�uatian (X1.4-7.}: 5�,5 = FaSs = 1.aa0 X 1.281 = 1.28], g �quatian (].1.�—Z): Sr,� = F„S� = 1.31b x 0.484 — d.637 g Section 11,�.� �-- Design Spectral AcceEeration Parameters �quatian (�.1.�-3): Sps = Z/ SMS = z/3 x 1.Z81 = Q.854 g �quation (11.�4—�4}: So� = 2� Snt� = �/ X O.G37 = fl.425 g Section 11.4.5 — Design Response Specrr�m From Figure �2W12�3� T� — 8 seconds Figure 11.4-1: Design Response Spec�rurr ��eTa:S,o°`�'os�p.4�M0.6TITo) ��;=D.854 - Ts S T S TS:Sa'�ns � � � °P {T51' 'S wS 1T �p i i e �` � m y i i C I I �7}'L;Som�o4�C�T� d I i � I I 4 I I y � � y � � U � � U I I �. I I y � � � �0�=0,�25 --i-�______-ti------------ > � � � i N � � � d � � i � I i � I I � � I I � �' I I � � I I � v � , � a i , � �n , , , � � , � � , � � , , � , � � , T�=a.ioo r=o.��a a.aoo Periad,T{sec) 17065 hrip:llehpl-earfhquake.cr.usgs.govldesi gnmapsluslrepor3.php?lem pl ate=m inim al&iaiitude=35.24805&lon�i tude=�12D.68G14&si€eclass=2&riskcaiegory-D&ediii o... 316 GI2�12016 Design Maps Detailed Report Section 11.4.6 — Ris�-Targeted Maximum Considered �arthquake (MCER) Response Spectrum The MCER Response 5pectrum is delermined by multiplying Lhe design response spectrum above by 1,5, 5,,;=1.281 - 1 i i � i i � i i y i i i i � I I 0 � � � i i I I y � i � i u � � � i i � i i � i i --0.637 i i y� ��1,'"' _�_____'_'______________ '. � i I I 0 fl, I I I � I I f � I I I } I I � 3 I I 1 I I � i I I y 3 I I � 1 I I � S ! I I F � � } 1 I ! 1 I f 1 I 1 � T¢�O.OJ9 T��0.497 1.Oi70 Period,T(sec} 17066 htt�:llehpl-earthquake,cr,usgs,c�ovldesi ynm apsluslreport.php?lemplaie=mi ni m al&la(itude=35.24805&longitude=-120.68Gt4&siteclass=2&riskcategory�0&editi o... 4f6 � 6123/2016 Design Maps Detailed Report Sectian 11.8.3 -- Additianal Geotechnica[ In�estigation Report Rae}uirements far Seismic Design Categaries D through F F��om Fi u��e 22-7 C47 PGA = 0,54i Equation (11.8�1): PGAM = �p�APGA � 1.000 x 0.541 = 0.541 g Table 11.8--1: Sike Coefficient FP�A Site Mapped MCE Geometric Mean Peak G�-ound Accelera�ion, PGA C[ass PGA � 0.10 PGA = 0.2� PGA = 0.30 PGA = 0.40 PGA ? 050 A fl.8 �.8 D.f3 D,f3 O.f3 S ' 1.0 1.0 1.0 1.0 1.6 C 1,2 1.2 1.1 1,0 i.0 D 1,6 1.4 1.2 1,1 1,D E 2,5 1.7 1.2 0,9 D,9 F See Section 11.4.7 of ASCE 7 Note: Use straight-line �nterpolation for intermediate va[ues of PGA For Site CEass = C and PGA � 0.541 gf FPGA = I.000 Sectian 21.2.1.1 -- Method �. (fram Chapter 21 - Site�Specific Ground Motion Pracedures for Seismic Design} Fr�m �ic�ure 22W17 Cs7 CRS = 0,90Z Fram �ic�ure 22-18�5� CRi = 0.939 17067 hflp:llehpl-earthquake.cr.usgs.gov/des ignmapsluslreport,php?template=mi ni m al R€atiti�de=36.24 B05&I ongitude=-120.G86�14&siiecl ass=2&riskcategory=0&ed�tio... 516 f 6121I2016 Dasign Maps Detai[ed Report Section 11,6 -- Seismic Design Category Table 11.G-i. Seismic Design C�fiegory Based on Short Period Respanse Rcceleration Parameter iZTSK CA'��GORY VALU� OF Sos I ar II ITT TV 5p5 C O.Jl67g A A A 0.167g � 5os C 0.33g B B C 0.33g � SDS [ 0.50g C C D O.50g c 5p5 D D D For Ftislc Category = I and Sos � 0.854 g, Seisrnic besign Category = D 7able 11,6-2 Seismic Design Category Based on 1-S Period Response Rcceleration Parameter RISK CA7�GORY VALU� O� Snl I ar IT III IV 5p, C 0.067g A A A OA679 5 So� C 0.133g B B C 0..�339 C So� C 0.20g C C D 0.2.Q� � Soa � D D For Risk Category = i �nd Spl � 0.425 g, Seisrnic Uesign Category = D fVote: When 51 is greater than or equal to 0.75g, the Seismic �esign Category is E for buildings in Ris!<Catego�-ies I, II, and IIT, and F for those in Rislt Category IV, irrespective of the above. 5eismic Design Category � "the more sev�r� design category in accordance with Table 1J�.6-� or 11.6�2" = D fVote: 5ee SeclEon 11.G for aiternati�e approaches to calculating Seismic Design Category. r References i; 1, Figur-e22-�; http://earChq�take,usgs.gov/hazards/designmaps/dawr�loads/pd�s/201D_ASCE-7 Figure�22-1.pdf 2. Figure Z2-2: I�ttp://earthqual<e,usgs.gov/hazards/designmaps/downioads/pdFs/2010_ASCE--7_Figure 22�2.pdF 3. Figure Z2-12: http://earthquake.usgs.yov/hazards/designmaps/downloads/pdfs/2010_ASC�-7_Fig��re_22-12.pdf 4. Fig�tre ZZ-7: l�ttp://earthqual<e.usgs.gov/hazards/designmaps/downloads/pd�s/2010_ASC�-7_Figure_22-7.pdF 5, Figure z2-17: http://earthquake.usgs.gov/hazards/designmaps/downloads/pdfs/2010_ASC�-7_Figure_22-17.pdf 6. Figure 2z-18; http;//earthqu�ke.usgs,gov/hazards/designmaps/downloads/pdfs/2010_ASC�-7_Figure_22-18.pdF 17068 http:llehpl-earthquake.cr.usgs.govldesignmapsluslreport.php?templata=minimal&[atitude-35.24805&longitude--120,68614&sifec[ass=2&riskcafegory=0&ediiio.., �16 APPENDIX G.2 Subsurface Fault Investigation and Development Setback Map 17069 This Page Intentionally Left Blank. 17070 � SUBSURFACE FAULT INVESTIGATION AND DEVELOPMENT SETBACK MAP PROPO,SED MADONNA FROOM SPECIF�C PLAN AIZEA APNs: 067-241-030 and -031 SAN LUZS OB1SP0 AREA SAN LUIS OBISI'O COUNTY, CALIFORNIA PROJECT SL09'734�2 '� � E � P�•epa�•ed fo�� Madonna Frooam Ranch C/o Madonna Construction Company,I�ic. Post Office Box 5310 San Luis Obispo, California 93403 Prepared by G�oSoLUT1oNs, Irrc. 220 HIGH STRE�T SAN LUI,S OB�,SPO, CAL�TORNIA 93401 A�»•il I4, 2017 17071 ,'� ; ' G[eDS011,it10175, IN[. 1 a21 West Tama Lane,5uite 105,Santa Maria,CA 93�54 22d High Sh•eet,San Luis Obaspo,CA 93401 (805)614-G333, (805)614-6322 fax (805)543-8539,(805}5�3-2171 fax SBiiifo(i�geosoiutions.net info@geosalutions.net April 14, 2017 John Madon�la c/o Mado�uia Construction Compa�iy, Inc. Post Office Box 5310 San L«is Obrspo, California 93403 5ubject: Sllbsur�'ace Fault Investigation a��d Develo�ment Setbacfc Map Madonna�'room Specific Plan 11eea—AI'Ns: Q67-241-030 and-031 San Liiis Obis��o area, Sa��Luis Obispo CoLmty, Califo��nia Dear Mr. Madonna; A substu�face fault inves�igation has been conducted for the proposed Mado�ula Proom 5peci�c P1a�1 Area develo�ment to he located an APNs 067-241-030 and -03 i, ii7 tlae San Luis Obispo area, San Luis Obispo County, California. The Los Osos faLilt has been located at the proposed develop�nent by use of E��e�ches, surface topagraphic expression, utilization of ae�•ial photographs, and pi•evious geologic mapping by other authors. Developmen� setbac3cs have bee�� established based upan cifaracteristics of faulting; active faulting is inte��peeted along portions of the Las Osos fault at tlle site. The site is pri�narily coil�posed of Franciscaii Com�lex units i�� the upper (westei•�i) topograpi�ic regions co�eeed with a vei}eer of sw�face soils {colluviiEm and al[uvium}, Alluvial sediments are wi#hin the (eastern} lower topagraphic ��egions. Recommended develo�ame��t sethacics fi•om the Los Osos fai�lt are peovided within the eeport. Geosolutions, 1nc. app►'eciates the opportunity La providc technical se�•vices to you. Should you llave any questions regarcling this report, please call{$45) 543-&539. Si�zcerely, ��°aw�"��� GeoSol�tions,Inc. ��C�''d�N�hJ��p� - - � � N4.21fa � � FlE[l lohn I{am�ner, C.E.G. #2118 �NGINEERING GEOLQGfST Principal ��9�0 �d���� VWas-cl-dG181s�SL99500-SL09999i5L09734-2-1'1t00MFLVfLLA -fAU1:f1G¢oluoy1519734-2 6nalFaullrp[apri114.docx 17072 f 4 TABLE Or CONTENTS r I. INTRODUCTION and PURPOSE.......................................................................................................1 = i I.1 Pcoposed Developine��t.................................................................................................................]. ;: : II. SCOPE Ok'WORK.......................... .....................................................................................................2 , III. PAEVIOUS STUDIES..........................................................................................................................2 ;. N. METHODOLOGY................................................................................................................................4 : V. ENVIRONMENTAL SETTING and GEOLOGY ...............................................................................5 =' V.I Regiona.l Geology......................................................................................................................b V.�I Site Geology..............................................................................................................................6 V.I LOS OSOS FAULT..............................................................................................................................5 '':- VII. ESTIMA'I'ED AGES OF UNITS........................................................................................................10 `: VIII. FAULT TRENCHING................................................................................................................12 IX. DTSCUSSION AND SETBACKS .••..••.••.•17 ' X. CONCLUSIONS and RECO1vIlVI�NDATIONS � ................................................................................I9 PLATES Plates 1 A, IB, 1C-Site Engineering Creologic Maps Plates ID, 1�, 1F—Site Engineering Geologic Maps with Fa�li Setbacks �'late 1 G—Site C�'oss Sections Plate 2--Earthquake F�ult Zonc Map{State of CA, 1990) 1'late 3A,3B—Le€tis and Halt, 1994 Plate 4—Superimposcd Fault Ma� '� Plate SA,SB-Regiona[Geologic Map,I-Iall, 1973 and Creologic Explanations ',� Plate 6-Regiona]Geologic lvlap,PCr&E,2014 and Geologic Ex�lanations Plate 7A,7B �Itegionai Geologic Map,Weigars,20[I Platc 7A,7B--Lettis&�lall, t 994 and Gcologac Explanations Plate$—Google Image with USCrS I<M"L'faulting—2016 P[ate 9—Regionat Fault Map,Jennings,2010 and�xplanations Plate 10A, lOB-Regional Creo[ogic Map,Dibb[ee,2006 and Cyeologic Hxplanations Plate 11�-LiDAR Image-2011 Plate 12—Lettis and Hal[, t 994,Location of I,os Osos Pault Segments Plate 13—USGS—KMZ faqits in�arthqu�ke Fault Zone Area APPENDI3�A Trench Logs-'T'-1,T-2,T-3,T-4,T-S,T-6,T-7,T-8,`I"-9,T-10A,T-lOB GST Trench Logs—Sheet Logs 1 Boring Logs Laboa'a€ory Results North Wall of`�'rench T-2a—Lettis Consultants International,Inc. Photo Log of'I't�ench T-2B Noi�h Wa11-Lettis Consaltants�nfemational,Inc. Photo Log of T��ench T-2A South Wall-Lettis Consultants International,Tnc. �arth Cansultants Inte�-national--November 18,2016 report Farth Systems Pacific,Feb€•uary 28,2000—Yortion of report �art[�Systems Cons�iltants--Octobcr 29, 1997—Portion of a'epart (`,eoSolutions,Inc.,-7anua4y 27,2000—Yartion of repoct Earth Sys€ems Cansultants—October 7, 1997—Portion of repoi�t 27 17073 3 F LisT oF TAB�,Es Table 1: Sti�nma�y af Fat�lting Cha�•acteristics............................................................................................16 F i LIST oF rrGu�s � :. Figua'e 1: Area Locatian Map........................................................................................................................1 �. � ; i' ,� � � � 17074 SiTBSURFACT FAULT INVEST�GATION ANll DFV�LOPM�NT SETBACK MAP PROPOS�D M.ADONNA FRODM SP�CIFIC PLAN AR�A APNs: 067-241-030 and-031 SAN LUIS OBISPO Al2EA, CALI�ORNIA 1'RO.TECT SLD9734-2 I. INTRODUCTION and PURP�SE This St�bsur'face Fault � �. Tona usa�o Investigatio�i and Deveiopment t`` l / J'/ �! � � `'�j���i\, O C �Y \`l {pJ� �' `\�� � '� SeLbacic Map presents geologic , ` � Y, Jr ``,�+� �, ;�;.���,�'E , . % ��,4�� 9 �t j1_��' �� +'P� \�\`!;;` � t_�—-•—r'-•� site conditions anci ciiscussian of ���` �� �-,� e�;'4 �•��:��,; �= ' �e� ( �r ''� � \� � a�z �� ��d��9 �`l..\ t ' sai �ORo ( the Los Osos faL�lt tl�rou h the ,,,� �a�`A ���°�� �'� �� ' 8 �� g �� <r �`(��`��°��.1���'p _/��.\._. pY•o�ased Madanna Fi•oo�n f �,<__ ����•' � , - ; � .�\. , `' �` '' '�� Specific Plan Area APNs 067- �'� "-- `- '� -_ _.��.._�� `,'--=:�14, '� � �--. ��35.z48450,-120.68b144— - 241-030 and 031, San Luis V/�:� f `� � 1 � �� = �1 \ '�G�C ,�� i� , _ � ; �g. n L��w '�. Obispo A�'ea, California. A .� 1}� ; �. , ;�• �,y „l, t; ,� GeoSolutions, Inc. Pi�eliminaty 1 �-�� , . ' ,� �.i�C \� �����'' �4?� I�� r`��'�l__ - ti.r�'�� i \�— � f � .r; � �,,�y � � .r - U . f. ° ��y ..��. ���gineering Geology Repo�� t'� t ,' .� ,.. �. �I.,�� ,, , j��r : +� � �� _� (�pril I4 2U17) recomm�nded a � l�, � ' 's ���,�I�11 � ', a i `���y / �'� L � 1 .. ' ���4 1 I;� t , r L�4`'OSV LLEYRO� fault stud be conducted for the � � ' » r� � . i y; �t�'f�%ty� P v�� y % � �' f i m� ;% I � site. Reference geologic maps ,' ��� Jf� - ` ',1' ' (����` �a�`��.�,� % � N� � a��d reporting data depict stE-ands � �' �,, /f ` �_- � ;+i,�j1+�'. ; �i:_�: � -- - -"',' � ' _ �''J1� '' -� r _ of the Los Osos fa��It tt�ending � =- . — 1 ea�a u�e r�a�x�to icEnso. � through a pa�'tion of the �w���.To��^�e '- '- Hvrxd3b���� �W�� P1e Tcom131f� proposed developinent. Tiie pu�pose of this st��dy was to ��g�re I: Area Location Map locate the trace of tlle Los Osos fa«lt th�'aErgh the site and establish deveiopment setbac]<s from the fault. Tl�is �•eport details the fault in�estigatiou and pi•ovicles development setbacks fa�� the propei�ty. Plates lA, l B, a��d 1 C are a Site En�inee��ing Geologic Maps (Plates 1B and lC are enla�'gements af Plate lA) that dep�ets locai geologic conditioi�s. Plates 1D, lE, 1F are Fault 5etbacic Maps (Plates lE and 1 F are cnlargements of Plate 1D). Plate 1G presents geologic ct'ass sections of the �ropei�ty. The Los Osos fault is a reverse fault that dips to the southwest beneath the Iz•ish Hills that extends soutl� fra�n the coinmu�tity of Los Osos to near Lopez Lalce in San Lliis Obispo Couilty, Approxiinately 8,Q04 feet nortllwest of the p��opased project, the Los Osos fault is mapped as �-Iolocene active as defined by the State of California(State of C�lifornia, January t, 1990). Piate 2 depicts the EarthqL�alce Fault Zone z��ap ar�d Plate 3n a��d 3B (Let�is and Hall, 149�) depicts the location of thc Ea�-thq�ta[ce Faul#Zc�r�e map in rei�tion to the Madon��a Proom site. I1 Pro�osed DevelopmenE The proposed dcvelo�ment is to include resides�tial structui•es, apartine��ts, i�igl�-de�lsity residential, some cominercial development, a 11ote1, independent senior fivii�g and assisted living, c-ecreational facilities, �'estau�•ants; movie theatees, and 51 percent of the project as apen space. Tl�e propased sti•uctu��es are anticipated to be constructed using iight wood ['�•a�ning and/or light gauge steel/structEiral steel. 17075 GeoSolutions,Inc.,Madonna�room 5pecific Plan Area—fault Investigation Project No.5L09734-2 April 14,2017 II. SCOPE OF WORK � This Subsurface Fanit Investigation and Development �etback Map repo�-t is a supplement to the Preli�nina�'y Engineering Geology Iiivestigation (GeoSolutio�is, Inc., Apr�l, 14, 2017) fo�• ihe proposed development. Tlie scope of set'vices for this investigation included tlie foliowing tasks: I. Resea��ch and ��eview of pet�tinent publislied geologic lite�'at�are, �•egional faulti�ig aud seismicity nriaps, p�•e�ious site in�esti�ations, aerial photo�raphs, topog�'aphic maps, LiDAR image�y, consulting reQo�ts, and web-hased information as listed in ihe �•eference section of this ►•epo��t. 2, Research at County of San Luis Obispo and City of San Luis Obispo fot• soil report data alid geologic z'epor�ts of adjacent propei�ies to the Madonna F�•oom site. 3. Geologic surface mapping of the p�'ope�•ty. �; 4. Trenching of I6 sets of fautt h•enches (15 individual t��enches total} to aid in definin�tlae Iocation of tlie Los Osos fault through the subject site. Location of trenclies was based t�pon � linea�nents from p�ibliskaed documents, topographic anomalies, potential areas p�•oposed for � developinent, and �eologic mapping that suggest faulting. 5. Field logging of trenches aild inteipretation a�id e�aluation of the exposures. 6. Soil sh�atigraphic assessnrient to estimate the age of soils observed in Trenches T-lA and T- 2A by Earth Consultants International. 7. Meetings, discussions, and review of open fault t��enckaes wi#h �a�•th Consultants lnternational, Lettis Cons�iltants Interr►ational Inc., and Pacific Gas and Elect�'ic geoiogists at the site. 8. Meetings with Qroject planners and developer z'egarding proposed de�elopment. 9. Preparation of tfiis t•epo��t suinma��izin� the fndin�s of the i�ivestigation a�1d pt'oviding �•ecoin�nendations rega�•ding de�e[opment. III. PREVIOUS STUDIES The scoQe of wo�'k for this study was based in part on upon past published geologic maps and �•eports both � o�1-site and off site. Prcvious studies include: 1. Previous published geolo�ic maps tiave identified t�'aces of the Los Osos fault tkat'ough the site as depicted on Plate 4, Superimposed Fault Map. Fault traces fio�n Hall, 1973 (Plates SA- SB}; PG&�, 2014 (Plate b); Wieget's, 2011 (Plates 7A-7B}; and KMZ-USG� {Plate 8}, 2016 we�'e superimposed o�1 P�ate 4. It sl3ould he unde�'stood that differences in map scaies and iine-widths fi•om Qrevioiis geologic maps at•e "best fit" as rectified to Plate 4. Fault t:•ench locations foz'this study were established to intersect tEiese published fault [ocations. The Los Osos fault depicted on Je�a��ings, 2010 (Piate 9},was not added to Plate 4 because Lhe fault on Jennings, 2010 could not be accurately positio�ied due to lar�e scate differences between tlie two maps. A Regional Geo[ogic Map fi•o�n Dihblee, 2006, (Plates 10A-lOB) did not show faulting at the site. 2 17076 E GeoSolutions, Inc.,Madonna Froam Specific Plan Rrea—Fault Investigation Project No.SL09734-2 Rpril 7.4,2017 2. A previous fault investigation withi�� tl�e vieinity of tlie Earthqualce Fauit Zane area Located approxitnately 8,000 feet narth of tlse subject prope�-ry was conducted by Ea�•lh Systcros Paci�c, Feb��uary 28, 2000. Plate 3A depicts tlie lacation of this stl�dy. Several fault trenches we�•e exca�ated for this study. The repart stated "The faults encountei•ed on the subject site : � wEre determined to be Pleistocene to lale Pleistocene age, whiclz a►'e not considered to be active, as defined by tl�e State. Although these faults are not active, there is a pate�ltaaR fot• differential (ho3�Yzo�ital and vertical} itnovement and ground crackiizg to occur aIong tfiese faults du�•ing strong ground shaki�ig fi•ozn an ea�-thc�uake evet�t". The repoE�t alsa stated"Based �: i, on the above crite�•ia, it is reca�nme�ided tliat buildings be set back a miniinii�n of 25 feet fi'om seconda�y antithetic Ehrust fault on the hanging wa11 blocic (up-th�•own)..., and 10 feet on the foot wall." "Pa►• the high-angle fault that crosses Lots 31..., buildings shouId have a �niaii�nutra setback of IO feet on each side of the fault." A portion of tiiis report is cor►tained witfiin Appendix A at the end of this repa��t. 3. A fault investigatio�� was co�lducted at the Home Depat store {prior te�'tned "Eaglc Hardwat•e and Gaeden") located i►�mediately north of the Madonna �'►•oom Spccifc Plan At•ea (Ea�-th Systeins Consultants, Octabe�� 29, 1997). Plate 3A depicts the Iocation of the �a�-th Sysle�ns Coiisultants, I997 study area, One 473-foot la�ig fault trench was excavated for the Eagle Hardware site. The report stated "The soil units exl�ibit stc��etures and cantact relationsllips rvhich suggest that they we��e deposited as alluvial "averbanlc" flood �[ain deposits by low � ene��gy currents of the ancest�•al Prefumo Creelc. Occasio�ial bL�ried cha�mels we��e obse��ved which consisted of unconsolidated, Iight brown sandy gra�e[. These cha�lnels wea•e often discontinuous and it�•egularly shaped." Alsa, "A charcoal sampie was collected and aged dated ta 2,650 years (+1- 50 yea�-s) before present. This soil date generally co��relates with a soil date of 2,516 before p�'esent from the 1'G&E Cuesta T�-encfi T-3. The PG&E trench was located south of Los Osos Valley Road app��aximately 1.25 trailes west of the site, in tlie same alluvial valley." The E�epa►•t cancluded "There was no physical evidence in the subject t�encli that would suggest the pz'esence of fauiting within the proposed b4tilding area. Soil Iayers we��e generally horizontaE, continuous and iEnbroken. In view of the continuous and unbroken condition of these soils, aild that the age of tlic soils encauntered on tlie subject site pre-date the soils encountered by PG&E, it is cancl«ded that the fault feat��res mapped by PG&E do nat extend into the zone investigated. Based upon tlie aba�e, we are af the opinion that �Zo acti�e faults cross o�' a�•e within 50 feet of the pr•oposed buildi�ig at•ea. Therefo�•c, based upon tliE cut'rent level of taiowledge, the potential fa�' fauit-related ��ound rupture to occi�r in tfie proposed building a��eas is conside�•ed to bc low". A portion of tliis repot-� is cotttained within Appendix A at t11e end of this repat-t. The conclusion that no faultittg was obse���ed fi•a�n the offsite fa«It iilvestigat[o�t at Eagie Hat-dware and Garden Iias been nated for that po��tion of Ca'ench T-6 (Madonna F►•oom site) that has been logged and infers that tl�e ]ocatYon of the Los Osos fault in the norther�l po��tion of the Madonna F�-ooan site is constrained to the 6ocatian as Enapped on Plate lA. The�•e is a geolog[c contact at this ve�y narthe�-n portion of the MadoYma Frooin site that has Francisca�i Co�nplex tlirust o�e�� Oldc�-Alluviutn (as also mapped in trench T-lOb). 1'he Los Osos fault appears to be rvell const�•ained in tl�is northe��n po�-tion of tl�e Madonna Froo�n site as mapped on Plate lA. 4. A fault Ynvestigation was conducted on tlie thett vacant pa�•cel at the so��thwest corner of Los Osos ValIey Road and Madonna Road in San Luis Obispo (GeoSolutions, Inc, Janua�y 27, 2000}. See Plate 3A fo�• Eocatian of this st�Edy. A vegetation lineament of the Los Osas fault 3 17077 � GeoSolutions,Inc.,Niadonna Froom Specific Plan Area—Fault Invest9gation Project No.5L09734-2 April 14,2017 as depicted on Lettis and Hall, 1994 was mappcd at ti�e vaca�it pat•cei. A fault ii7vestigation was conducted to verify absence or p��ese��ce of the fault at the site. A SOS�foot long t�•ench was excavated to an average de�tl� of 15-feet. The t�encl� exposed alluvial deposits and subunits were inapped. The repoi-t concluded "No e�idence of fauiting was identified with a 505-footlo��g fault tE�ench excavated at the site. The vegetatio►1 Ii��eament published on the Lettis and Hall, 1994 map coiiicides with a substa'face, sedimentaty cl�amiel feature in.the viciiiity of the 253- to 300- foot t�'ench �narlcers. It is our opir�ion that the vegetation li��ea�nent frotn the Lettis ar�d Hall, 1994 geoiogic inap indicates a subsurface sedimentaty channeI feature ar�d not a splay of the Los Osos faul#." A pa�-tian of this t'epoz�t is co�itained witlzin Appendix A at the end of this re�ort. 5. A "Geologic and Soils Study, De Vaul Ranch"was co�iducted by Earttz Systetns Consultants, dated October 7, 1997. See Plate 3A for location of this study. A se�'ies of 1 S trenches we��e excavated at tfzis prope�•ty to "dete�•mi�se if a�iy potentially fauit-��elated featut•es could be discerned in tIie areas slated for development" (no map was supplied in the report depicting lacation of the trenches). The report co��ciuded"At this time, the site is nat Iocated witlain an Ea��thquake Fault Zone. There was no pliysical evidence in any of the trenches that would suggest the pt•esence of faulting within the proposed deveiop�nent area. So�l layees were gene�-ally ho►•izontal, continuous and unbroken eYcept in T��encl� 8 (outside the de�elopmciit aa•ea), where evidence of strilce-slip and/or re�e�•se faulting was obse�ved. No evidence af the u��de�-lying tlzrust fattlt was eiicotmtered in any of t11e trenches." A po��tian of this �-epot�t is contained r�vithin Appendix A al the end of this report. G. A Prelimina�y Engineering Geology Cnvestigation (GeoSolutions, Inc., April 14, 2417) vvas cor�ducted for #he subject prope�-ty (Madon�ia Froom) which identified gene�•al geologic characteristics of the p�'operty. As pa��t of that i�i�estigation, trenchi�ig to obtain sorl sa�nples for soils engineet'ing purpases (trenches labalad GST-#€ on Plaee IA-1F} occun'ed at the pro�e�-ty. Tre�iches GST-1 and GS`I'-2 encountered reddish brown si[ty and sandy ctay te�'�ned co[[uvium from ground surface Co 2 feet bls. Franciscan compiex matet'ial was below co[luvium to total depth af ;� approxlinataly 4.5 feet bls. Trench GST-3 e�icountered dark brown silty clay with rot�nded cobbles (to ,� 1-foot diameter} ft•om ground sut�face to 1.5 bls. This material is interpt�eted as al[uvium. Franciscan ; coinplex materia9 was below this allu�iuin to total depth of 2.5 feet bls. `I'z'enc1� GST-4 encountared a ;� pebbly silry c[ay interpreted as alluvial deposits from ground surface to total depth of 8 feet bls. i T�•ench G5T-5 encountered dar[c brown silry clay (intcipreted as colluvium) from g�•ound surface to 2 � feet bIs with Franciscan Complex material be[ow. Trench GST-5 encountered da�'k b�•own silry cIay (inteipreted as colluv[um) from ground surface to 2 feet bEs with F��anciscan Complex material below. T�•ench GST-6 encountet�ed dark b�•awn c[ay (interpreted as colluvium) fi�om grout�d surface to 3.5 feet bgs. Trench GST-7 encountered silty sandy clay with cobbles, pebbles, aiid boulders to a depth of 25 feet bls. This materia[ is interpreted as altuvium. Logs associatcd with these t�enches are within Appendix A oF this fault t�eport. 'I'he putpose of these GST-#ri•enches was to obtain soil sa�nples and not necessarily to observe fauIting characteris#ics. IV. METHODOLOGY For this fault it�vestigatio�i, a se��ies of 10 sets of fault tcenches {IS individuai trenches total) we�•e excavated at the site to locate tl�e Los Osos fault. k'auit t�•encliing was cond«cted from July to September, 2016 and was directed to determine both p�esence and absence of faulting in ce��tai�z areas. Trenches varied in lengtl� fi•o�n approximately 16 feet long(T�'er�ch T-2A)to 250 feet Iong(T�•ench T-1B). Trench deptEi va�'ied fi�om approxima#eIy 3 feet dee� to app�'oximately 15 feet deep. One side wall {predotninantly the r�o�•th wa[I) was detailed in a drawn cioss�section (sections provided in Appendix A). Scale of the sectior�s are or�e-inch equals 5 feet. Trenches were also still�photographed. Trenches were 4 17078 GeoSolutions,Inc.,Niadonna Froom 5pecific?lan Area—Fault Investigation Project iVo.SL09734-2 April 14,2017 be�7cl�ed and excavated utilizing a LC320 and LC350 track lloe. Following excavation of the tz'e�iches, the sidewalis of the trenches wez'e cleaned with a hand-held hoe and 6rush to �xpose geologic conditio�ls. Level lines we�•e cz•eated within the t1•enches to aid in elevatian scale. Fault t�•enches and fault locations we�'e iocatcd utilizing a TriRnble Geo XH 6000 witl� an acc«racy of 6-inches. Trenclies were bacicfilled with onsite materials. Trenclles at the project si�e we�'e excavated i�7 areas w[�ere previous autlio�'s have mapped pote�titial fault traces (Plate 4}, wl�ere surface topog�•aphic and geomozphic featut•es (such as b�•eak i�i slope) on a LiDAR Image (2011} (Plate 11} o�� aerial images suggested lineame��ts and anomalies, and wl�ere st��ilce of a lcnown fa��lt in one trench was extended to another po�tio�i of the site. T�-encl�ing at the site was planned to iiltet'Sect these features. Geologic units were demarcated based on lithology, structurc, colo��, and text►tz•e. Litliolagic differences wei•e the main c��ite�'ia fo�•diffe��entiation of units within tl�e trench logs. This is especially apparent withi�� the alluvial deposits witl�in the exposed treiich sidewa[9s. Bedroc[c sheat•s, disco�7tinti7ities, and disrupted units were observed. Geologic units mapped at the site iE�cluded fill, ►'ecent stream deposits, landslide ',� material, �ecent su�'face sails {termed colluvitim), O[de�'Alluvial deposits, Aeolian sa��ds, and Franciscan � Co�nplex rocic. Those areas ilot proposed far develop�nent were not investi�ated fo�•p�•esence of faulting at the site. V. ENVYR4NM�NTAL SETTING and GEOL4GY The proposed develo�ment is located at approximately 35.2G8050 degrees izoz-th latittide and app►•oxiinately -120.686144 degrees west longitude at an eievation of app�'oxi�nately 119 feet (varies) abo�e ineail sea leveI. The nearest inte�'section is where Los Osos Valley Road inte►�sects Calle loaqltin at the soLit[�cast corner of the p�•opecty. The project properties will hereafiec 6e collectively referred to as tltie "Site." � Tl�e Site is characlerized by flat to �-olling grasslands with natural drainages wl�ich rise to steep, rt�ocky hills at the soutl�weste��n portio�� of the property know�� as the 3rish Hills. The property is approxitnately "U" shaped witl� the pz•oposed development scattered in partions of the p�•ope�•ty. The Site is curre��tly developed with severa� older ��ancl� buildings tl�at are over 100 yea��s old. The property has past use and cu�'�'ent use for cattle/horse grazing. Native grasses, b�'ush, and scattered t�-ees currently vegetate tl�e Site. Geomorphically, the eastern portion af the site is flat iying and has been altered in the past by g��ading. F��oo�n creek exits the Iocal nnountain fi•ant and has deposited younger alluvial sediments in the flat lying area of the property. West of the flat lying area, the �t'ish Hills rise as a steep inountain front. Variations in topography are controlIed in pai�t by geologic coinposition. Steepe�� portions of the pro�erty are co�nposed of hard serpentinitc with metavolcanic rock and older a�h�viunn usually formiilg less-steep areas. Breaks in slope, to��al fcatures in vegetation a�id gcology, and linea�' features were reviewed for pote��tial indications of Quate�•�iaiy faulting. I't'o�n this study, it was fouizd t17at a break in slo�e was sometimes indicative of�'ecent faultitlg, mainly in the a�•ea of T�•enches T-2A, T-2B, and T-7 a1tE�ough there was a b�-eak ii1 slope in the vicinity of trench T-9 and no fault was observed within this trench. The Los Osos fault at the site was located near the base of the local topog��aphic change f�•om the flat ��ortion ', of the property to the local nnountain frant. Oi1 t��e �Zorth po�•tion of the property, the vicinity of the fault ' has been alteced by the Frootm draiiiage exiti�lg the nnoLr�itains and by �nan due to gt'ading. Nuance in topographic changes were difficult to assess i�� the norther�l section of the prope►•ty d�te tnainly to past g�•ading. 5 17079 � GeoSo[utions,]nc., Madanna Froam 5pecific Pfan Area—Fault Investigation Praject No.5L09734-2 Apri1 14,�017 V.I Re�ional Geolo�v The site is located in the vicinity of the San Luis [Zange of the Coast Range Geomo�'pliic Pro�ince of CaIifornia. The Coast Rarages lie between the Pacific Ocean and the Sac�•a�nento-San Jaaquin Valley and trend no�•thwcsterly along the Califo��nia Coast for appt•oxiinately 600 miles between Santa Mat'ia and tlie Oregon bo�•der. Plates V.II Site Geolo�v Locally, the site is Iocated along the southwestei7-► flank of the focal Santa Lucia Mountain Range and east of the adjacenf It'ish Hills. The site is generally withi�� Franciscan Complex units and alluvial deposits. Plates 3A, 5A, 6, 7A, and l0A a�-e Regioraal Geo[ogic Maps of the geraeral vicinity of the Site and Plates 3B, 5B, 7B, and lOB ��•ovide descz•iplions of these [Zegional Geologic Maps. These authoc•s ha�e generally inapped the site as within Ju�'assic and Cretaceous age (205-63 mybp)Peancisca�l Co�nple� units with alluvial tt�aterial in the tower elevations. Our exploration of the area encountered uilits of the Ft•anciscan Complex a��d alluvial deposits. Info�•mation derived from the subs«rface exploration was ttsed to classify subsurface soil and for�national units and to supplement geologic mapping. Plates lA-iF are engineering geologic maps of the site. Cross sections A-A' and B-B' a�•e prese�}ted on Plate 1G. Cz'oss section A�A' utilized an apparent dip (38 degrees) of the �,os Osos fault calculated it�oin a dip o�40W fcom trench T-7. The following ace geologic conditions as interpreted within fault tre��ches excavated. ;E A1tTIFICIAL FILL (Af1-- Artifciai fil! was abserved in t11e noi�thwcstern partian of the prope�-ry in the vicinity of Trench T-10A, T-lOB, a�id T-6. Filt was composed af dai•k yeliowish brown (10YR416} to light browiiish geay (10YR 612) sand and clay with gravel, cobbtes, with timber f�•agine�lts. � Thickness of fill in t�•enches ranges frott� appz•oxi�nately 3 feet and less but could be se�eeal feet depending upoi7 area. Fill also mapped along tlie levees adjacent to Froom CreeiC tha•oi�gl�the properry. LANDSLIDE DEPOSI'I'S (Qls} — La�idsl�de deposits are �napped in a sttzall section of the property just south of City of San Luis Obispo opera space p�•operty. This mate�ial is composed af clay, silt, satzd, g�'avel, and cobbles. Color va�•ies dependi�ig upon lacation but is gene��ally olive brown 2.SY 4/4. Thiclu�ess is uulcnown but is esti�nated to be approximateiy 1-foot to se�veral feet d�pending upon location.No t�'enches oi•bo��ings encounte�'ed this material which is inte�preted �t'om surface expression. STREAM DEPOSITS lOt1 _ Assumed Holocene in age. Stceam deposits were obse�•ved in ' Trench T-5. This unit is composed of geavel aR�d cobbles i�} a matrix of sand and silt. This �naterial appea�•s to be derived fi•om P�•oo�n Creelc drainage. Color was light yellowisll b�'owR�, lOYR 6/�l. Th�ckness of this u��it within tlie trencii is app�-oximately less than one faot but could be thicker depending upon area especially within stceatn areas. Tl�is matez•ial is mapped alo�zg the F�•oom drainage that flaws tl�rough the property. COLLUVIUM (Qe) — Assumed Holocene in age. Tlais coIluvial materiai is olive bfacic (SYR 2.511), da��k gray (10YR�411},veiy dark gt•eyish b�-own (lOYR 3/2), black(lOYR 211} and is i�1te�'preted to be �•esultant from weathe�•ing of u��derlying soil atsd rocic material. Vai•iations in colluviai �nate�•ial occut•t•ed accordi��g to location. Caliche (calcium ca�•bo�iate) is observed within tflis unit. Collur�ial deposits within 'I'renches T-2A a�id T-2B we�-e logged it� deiaii by Lettis Consultants Tnternational, T��c. (LCI). Photo logs of the �,CI tt•enches are contained within Appendix A. LCT statcs the coltuviutt� rs "silt with occasio�lal pebble to medium cobbles, Brown {I.OYR 413); clasts ai•e do�ninantly Franciscara, increasing in size to small boulders to west, angular, fractured, s[ightly weatE�ered, matrix is eolian silt, 6 17080 GeoSolutions, Inc.,Madonna Froom Specific Plan Area—Fault Investigation Project No.SL0973�+-2 Apri! 14,2D17 with some clay and sparse fi��e sa�yd; toose,�noist, sligl�tly to moderately cohesi�e; a surface soil seque��ce is de�eloping in �nit." Thickness of �iis unit varies depe�iding �pon location but, in general, is appt�oxitxxately 1 to 3 feet thick as observed withi►� the ti•enches. Colluvi�in withi�� Trench T-3C thicl<ens toward the east at app�•oximately 5 feet. ALLUVIUIVI al Yncludes 41der Alluvirtm on trench lo s – Pleistocene in age. Alluvial matez'ial was found within most trenclles du�•ing the fault investigatio��. Generally, alluvium he�•ein encompasses that mateeial thaf�nderlies colluvium and overlies Franciscan Complex bedt•ocic. Geilerally, alltivial deposits a�•e co�nprised of clay, sand, silt, pebbles, cobbles, and boulders (up to 2-feet diameter). Clasts wez'e composed pi•i�narily of Ft�anciscan Co�nplex t'ock and �nino�• Moilterey I'ormation sl�ale Enaterial that is rowided to subrounded. Caliclle was observed within tliis unit. Most AiluviuEn is �natrix (sa�id, clay) suppoi�ted. Coloc of the unit vaeied depending l�pon location. Colo�s ��anged fi•om mode��atc i- yellowish brown (l0Y 5/4), paie yellow (5Y 713), b�'ownish yeliow(lOYR 616), bt•own(7.5 YR 4/4), pale brown {IO YR b/3), dai�k greyisl� b�•own {lOYR 412), darlc brown (lOYR 3/3}, to darlt yellowish brown (lOYR 4/4). Thicicness of alluviu�n varies depending �pon locatio�i but is� ge��eral va��ies from 1 to 5 feet as observed within the fault t�-enches. To tl�e east, the alluvitim thicl�ens and in boeing B-2 at the site; alluvial sediments weee encountered to a depth of approxi�nately 45.5 feet deep iil bo��ing B-2. Alluvial deposits wifhin Trenches T-2A and T-2B were logged iii detail by Lettis Consuhants Inte�'national, I�ic. (LCl). Photo Iogs and detailed descriptions of the LCl trenches at•e contained within Appendix A. Units desceibed by LCI include Pleistocene eolian silt, fluv�al deposits, bedded all�vium, and slope collu�iu�n. FR.ANCISCAN COMPLEX (KJfs, KJmv, KJfg)� Cretaceous to Jurassic in age. This unit is tlie basement rock at the project. Types of Franciscan Complex observed at the site inciuded se�pentinite, greywacke sandstone, chert, melange, claystone, and metavolcanic rock. P�'anciscan Complex rocic at tl�e site varies fi�om fi•esh to very intensely weathered, ve�y hard to ve�y soft, and massive to slightly bedded {in che��t). Fractures within the rock �aried depending �pon #he rock type and location, and varied from tnoderately to very closely spaced, discontinuous to sIiglitly continuous, fi•acture ends could be seen in the exposu�•e, openness was tight to moderately wide, �Iling thicltness was no film coating to mode��ately thin, txxode��ately iicaled, stepped to smooth roughness, and dry fi•actu�•es with wate�• flow possible. Hardness of the rock varies; chert and sonne types of se�pentinite are very hard. Structural attitudes we►•e dif�icult to obse�'ve at the Site due to the massive, highly feactured, and weathe�-ed composition of the formational unit. Thickness of the F�-anciscan Coinplex is several ttaousand �eet thick, Emplaceinent faults (old fautts juxtaposing different types of F�'anciscan material against Franciscan matet•ial} are coinmoiz withia�the F��anciscan Coinplex PG&E (b/2014) describes fihe Franciscan Complex in tEie followiR�g manner: T17e Cf•etaceous to Jurassic Francrscan Cor��plex (unit syn�bol KJf ��vl�e3•e u�adiffe�°entrcrted) i�� the project area corzsrsts of 1�rultiple lithologles. The rtaost tit�tdespread Franciscan Coj�aplex unit is n7elange (arnit syra�bol KJfin) with krrocker�s of g�•aywacke (gx�); shale (sla); schist (sd�); bltieschist (bs); conglo��aer�ate (c�; rraetcrvolcan-ic rocks (ra2t�); silica carbonate (sc); a��d greeta, �t�hid�e, or t•ed che��t (ch). Also �t�idesp�•ead are �napped bodies of vaetavolcanic rocks (KJfi��v); sejpenti��ite (s); crnd gr•aywacke (KIf�. Ii� oi�e at�ea Por�t Sa�2 Luis—a rnappable body of ophiolite rs ccrtego�°ized crs part of the Franciscan Conaplex (Klfo), reflecting its e»�place�nent history and hono�•i�zg the OYTgl12Q� age L�2SIg11QtdOi? of these ��ocks by Hall (1973a), �ithologic co�7tacts tivithi�a the F���merscan Con�plex are al�nost exclusively faulted In co3atrRpst, tr�rit bou�zdarres bet��een the� Frai�cisca�� Cofnplex and yoi�rager� arnits crre cr 7 17081 i: f GeoSolutions, Inc.,Madanna Froom Specific Plan Area—Fault Investigation Project No.SL09734-2 Aprif 14,2017 t�arxtan�e of ui�confor�r�aable contacts ai�d fault co��tacts. At th.e sanface, the srze distr•ibzrtian of sarb-unit.s withi�a tl�e Fs•anciscan Co»�plex rs cor�s�ider•able, rajzging in scale frona se��eral ti�eters to seve��al kilorsaete��s; it rs likely tl�crt such a size dist�°ibutiofa is prc.se�at al deptla. Within a�ay given szrb-arnit, the size ajad de�zsity dist��ihutio�� of fi�actut�i��g and othel° r�ock discor�tirzarities rs also var�rpbTe hetween scales of tef�s to laarr�d��eds of lncier�s. This r�esarlis in frequcjat juxtapositiola of highly fi�actar��ed crnd coltapete���t bedrock. VI. LOS OSOS FAULT The Los Osos fault is mapped tl��'ough the suhject property as depicted on Plates lA— IF. Lettis and I-Iail (1494) subdivided the Los Osos fault into faur segments, fi•om the northwest to the southwest they are the Estet•o Bay, Irish Hi11s, Lopez Reservoir, and Ne�,+som Ridge segme►ats; Plate 12 depicts tEie location of these four segme�zts (Lettis arad Hall, 1994). The Irisl� Hills seginent is abaut l0 to 12 miles long and extends from the Pacific Ocean neac Los Osos eastward to 5an Luis C�-eelc and includes the study area. This segment of the fault for�ns the boundaiy betwee�i thc Los Osos Valley and the Irish Hills and has docunaented Holocene offset (PG&E, I988}. P.G. & E, suggests that tlie Irish Hills segment dis�lays thc �nost well-expressed geomoiphic fcatures displacing late�leistocene and Holocene deposits. A portion of the Ii-ish Hills segment is conside�'ed acti�e and has been included witl}in Alquist-Priola zaning by the State of California{1990}. PIate 2 depicts tl�e Ea�thqualce Fault Lone Map{5tate of Califoriiia, I940) az�d Plate 3A depicts the relation of the Ea�•lhquake Fault Zone inap arca to tlie Madonna Fraoin site. The fault zone has had a complex histo�y of both strike-slip and dip-slip displacement (Lettis and HaII, 149�). The fault zorae is a 50 �Cm long, 2 lcm wide system of discontinuous, subparaliel, and en echelon fault traces extending fi•om Estero Bay on tlie izorth to an intersection with the West Huasna fatilt southeast of San Luis Oh3spo. Along the coast, tfie fault zon� ht�ncates a flight of �narine te�•races, indicati�ig a ve�-tical rat� of sepaeation across the fault zone af abaut 0.2 mm/yr. Preliminaiy resu9ts fr•om E�ew geomorphic �napping, intcrpretation of rept•ocessed seismic-t'e�ectiora data, a��alysis of seisznicity data, and structural analysis suggest that the fault zone dips steeply to the so�►theast (45 to 70 degrees or possihly steeper), a�id �nay he primarily an oblique-slip fault, with a signifcant component of dip slip to accommodate uplift of the range. (PG&E, ra��ua�y, 2011, Sl�o�'eline fault study} The fault encountered during this i�lvestigatioii exhibited cl�aracteristics of active moveme��t (move�nent within the Iast I 1,�00 yeaa's befot'e present or Holocene in age, offset in colluvia[ sediinents), Q«aternaYy agc {last 2 inillion yeacs before present} mo�ement, and p��e-Quaternaiy movement {�novement priar to 2 million years before present}. Strilce of the fauIt in sevet•al of the trenches is app�•oxiinately si�nilai•. Fault strilce in Trench 3A is NSbW, iza T�'ench 3B is N6QW, in TE•ench 2B is N42W (to appeoxiinatcly N24W}, Tre�icli T-7 is N27W. Stcike of faultirag is plotted on Plates 1 B, 1 C, I E, and 1F. rennings 201�, maps the Los Osos fault througl� the site as "I�ate Quatez'na�y fauit displaceme�zt {duiing past 7b0,bOb years}. Geoinotphic evidence similar ta that descrihed for Holocene faults except fcatur�s are less distinct. Faulting inay be yo«nger, hut lack of younger overlying deposits precludes inore accurate age classiftcat[ora." An active fault section of the Los Osos fa��lt Iocated approximately 8,000 feet �ioa-thwest of the subject property is labeled on the Jennings, 2010 map {Plate 9) as "Holacene fauIt displace�nent {during past 11,70� years) without I�isto�'ic record. Geomoz'phic evidence fo�� Holoccne faulting includes sag ponds, scarps sliowing little erosion, ot• the followi��g features iii Holocene age deposi�s: offset stream courses, linear scarps, sht�tter ridgcs, and h-iangular facetcd spu�-s. Recency of faulting ofFsho�•e is hased on the interpreted age of the youragest st�'ata displ�ced by faulti�lg". Ti�is �ortion of Holocene faulting depicted on Jennings, 2010 is simiIar to the locatian af the Eacthquake Fault 8 17082 GeoSolut'tons,Inc.,Madonna Froom Specific Plan Area—Fault Investigation €'roject No.SL09734-2 Apri)14,2017 Zone Map depicted on Plates 2 and 3A of ti�is report (State of Califor�►ia, 1990). Studies perfo�-med by P.G. & E. (1988) indicate that the fault is a zone of R�o�'thwest trending high and iow angle faults tl�at x exhibits a cotnplex histoiy of both strike slip and reve�•se displacement. The Los Osos fault is desc�•ibed by PG&E(6-2014) in the followi�sg�nanner: The Los Osos fault zone was characterized by tl�e LTSP (PG&E, 1988) a��d Lettis arad Hall {I99�) as a late Qa�ate��nary reve��se faarlt tha! defi��es the nor•ther��a and nos•theastern naargin of tl�e Sa�Ltais Ratzge. The Los Osos fault is ci�at�acterized in tl�e vicinity of tltie Madonna Froonn a�•eas as (PG&E, 6- 2014): The southeaster•n ��aost recrch of the Los Osvs faUlt zv�e tii�ithi� the li°ish Hills study rn�ea— r��fol��nally narrted the east t•eacl�--is approxir�zately 6 to 7 kn2 lo��g and is located bet�veen Sa�Lurs Obispo Creek ajad a point approxinaately 2 kr�a west-no��tlztivest of tlae i��ter�sectio�� of West Foot17i11 Boirlevard a��d Los Osos VcrTley Road{A portion of this reach is depicted on Plata 3A of this Madonna Ft'oorn report). This r�c�ach itzcludes abr�arpt scarps arad tonal ai�d vegetative Iiraeanaenis at arrd �ea1• t1�e �°arage fi°or�t a�d a Ir�near fault zone wi�tl�in '� Fr•araciscar� Co�7�plex .serpenti�zite alorag the footlatlls .routh of the Ya�age,fi�orat (Lettis cr��d Hcrll, 1994). No systerncrtic later�al deflection of str�ean�s crossiszg the litae���a�e��ts or bedrock faarlt tr•aces was ��vted fi�o�sa LiDAR vr•field evaluation. Paleoseisnrre t��e�aclaes acs°oss sevej•al Irt7ea��aents and the hedr�ock fauTt zorze j�evealed evidence fo3� late Qiraternasy ''�� fatrltirzg alor�g the east reach, altlzough the rc�lationsl�ips betti>>een fauTtia�g, scatp for�n7ation, and di.ffe�°e�tial uplrft of the li•rs7z Hills r°elatii�e to the Los Osos Valley wet•e locally amclear� a�d conflicti��g (Lettis and Hall, 199�). Tlze tzortlaeasterra-7�tost tj•encl�— Ingley t��ench T-2— ct•ossed a raortheast facrng, 6-�i2-high topog!°aphre scarp rzeay� Los Osos Yalley Road a�d contairaed e��ide�ce for a geratly (22 to 29°) soirthu�est dipprng zone of tl�i•ust faxrlts with.i�a alluviu�aa that sho�•tened arad �°epeated a �r•o»aii�erat soil horizon, Slickerasides� were consiste�at ��ith dip-slip fcrarlti�g ar�d a Jeft-lateraT co�nporaetzt. The faulti�g e�posed ITe�•e was rr�teap�•eted to be the j•ange fi�ont Los Osos fault. Other� t�enches zrpslope of the I��gley trerach T-2 wer�e le,ss str•aightfor�vaf•d. For exat�aple, a tr°erach across the bedrock fault zo�e {Ells�vot•tl� t��ejach T 1) exposed evidetzce fo1�faulted QiraterTzcrry g��aveTs along a steeply ��ortlzeast-di�pirzg fault 1��ith svirthtivestside-dotivra ver•ticaJ separatiot7. S�i�iatio�as and folding of Quater�rzary strata wef�e colzsiste�t �3�ith nor�tlaeast- (valley) side-up revei�se faulti��g. Tre��ches crcf�oss pro3aai�aent scarps farther doiv��slvpe {at the Caresta a1�d Ingley sites) exposed evide��ce tlaat so���e scarps �3�er°e not assocrated with faulting and thus were n7ost Trkely erosivnal (Caresta t�°er�ch T-1), some faults offsetting Qarate3°�zary alluvrzma did not hcn�e recog�zizable geo3��v�phic expr•essio�a (Caresta t�°erach T- 3), and a prOl77d7?G'Y1l 7?Ol�tl�east� (valley) side-down scarp was aijader�lai�a by a no��theast- dipping fault placing F�°anciscan Con2pTex naela��ge in the hcrngir�g ��all agai��st Quater•nary alltaviirjn isz the footwall {indicating valley-side up faarltijag} ���ith ,��lickensides consistent witla.pu�°e dip slrp {Cuesta t�•enches T 2 a��d T-3). Other faarlts with geor�ro��hic expt•essio�z sim�ilar�ly slaowed evidetace for nor�theast- (va7ley) side-up f�eve�•se displacenael�t with Fr^anciscan Cornple���vcks faulted against Tate Quater�nary depnsils (hagley tre�ach T- 1). Lettis and HaTT {199�) proposed aTtej•�ative e�planations foj� tl�e ar�aexpected obsetTvatfor�s, i�acludit�g sca��farmatiotz by erosio�al (as opposed to teclonic) p��ocesses, and raornaal reactivatiorz of ear�lre�� Quate����ar�>>•eve��se fairlts. The prefer°red i�zterpr�etatio�a in gene��al was tl�at deformatiotz obser•ved ir� tr�enches i�� the footlziJJa� and raeas� the T�ange 9 17083 GeoSolutions,Inc.,Madonna Froom Specific Plan Area—Fault InvesYigation Project No.5109734-2 AQril 14,2017 fi•ont was secondar•y, ha��ging-�vall deforr�aatio�� crbove an ullderlyr��g, south���est dippirag thr�ust o3• �•everse fault that�T�ojected u� dip to the r�ange fi�ont of the I��isla Hills� (e.g., such as at Ingley tt°e��ch T-2). Alter�r2ative intejp��etcrtto�7s to explain the co��flicting t�elatior�ship bet��ee�a the geols�o�phic scarps a��d fairlting obse��ved i�a �he t�•e��ches N�ej�e pr•oposed witla i�arplicatior�s for possible char�ges i�� dip wit17 deptlz on a� u��der°lyf��g ran.ge-fi•or�t fault (Lettis ar�d Flall, 1994). �1Jthough the east recrch of the Los Osos faarlt zone witlrin the li�ish Hills segrnent i��cludes the s�tj•or�gest e��idence fo1° a shalloiv or enaerge�7t, sautlati��est-dip�i�g Los Osos rever•se fcrarlt, the absence of a foot�vall hasrn, and the lack of a conapellijag, lcrte��ally-contirzuoats fcrult (o��fault scaip} at the surface is also consistent with a r��ostly blr�ad Los Osos r�ever•se fault o�• a fold hif�ge at the �°ange fi°ot7t thcrt is localJy b�°oken by disco��tinuoars faults. Intetpl�etations of seisn7ic-reflection dcrta ac��oss the east ajad east-cejat��al r•eaches of t12e Ii•ish HiT1s should cof7sidet� the obser-vatio��s of steep fairJtr�ng if�F1•anciscala Conaplex rocks ;' a� the sirrface (pa��tica�larTy the serpentinite-defi��ed fcrirlt zone alorag the footl�iUs szrb- _ paj•allel to the range fi�orat), a locally obse3•ved south��est-drpping thrust fairJt at the range fro��t, possible changes ir� fa�lt dip with depth beraeath the foothills, and alternati�>e �I hypotheses for active str•uc�tr��es that can accoratr�aodate differential uplift of the 1"i�ish Hills relative to tlae Los Osos Ycrlley. Compa�•ing t[se fauiting characteristics from tl}e above dese�'iptio�i with obser�ed faulting characteristics I� withi�i trenches excavated at the Madonraa Froom site, the s[te generally shows a southwest-dippin� �ault that is b��olcets by discontinuous fauIts. Altliough the Los Osos fault as mapped at tl�e Madonna Froonn site e�ibited discontinuities (ie, Hoiocene-active faulted a�•eas and Quaternaiy age {older} fa«Ited areas (ie trenches T-4, T-lOB}, the study at the Madonna Frooin site conservatively reco�tnmended a developnnent setback region along the fault. Plate 2 depicts the Earthquake Fault Zone map fo��the area Iocated app��oxiinately 8,000 feet northwest of the subject site. Plate 13 is data fro�n USGS — 1CMZ files as depicted on a Google Eart[-► Image for this Earthqualce Fault Zone area. Plate 3A, Lettis and Hall, 1994 depicts the Los Osos fault in the a��ea of the Madonna F�'oom area. These �naps shows disconti��uo�ts charactei•istics of the Los Osos fault in the vicinity of the p�'oposed project r�vhich is similar to the faulti�ig chat•acteristics identified in the fault investigation at the Madonna Froon� Specific Plan area. VII. ESTIMATED AGES OF UNITS Esti�tnates on the age of tl-►e soils developed in colluvium and alluvial deposits we�•e conducted by Eai�th Corasultants Internatioraal, Inc., (ECI, Noveinbert' l8, 2016) in conjunction with PG&E (see Appendix A for docu�ne��t}. No chaz'coal was identified ira the soils fo�� absolute age dati�-►g. Pedologoic age-datiiig techniques are based oiz fou�� soil pi•ofles desct'ibed in h•enches T-1A andT-2A; th�•ee fi�o�n Trerach T-lA and one fi�om Trench T-2A. The locatioras of these profiles are show�i on logs developed by LCI in Appendix A. As described in the Noveinber 18, 2016 docuEnent, Th�°ee of these profrles i�zclude a surfcrce soil cr��d two zmderlyil�g ban�ied sorls. The last��°of le u�e desc�°ibed is cr soil developed ira a frning-uptivard sectio�a of ft�7e-g��ained sedirjae�ts that �ver•e deposited i�z a lo�v spat that appear�s to ha>>e for�naed as a resarlt of rno��e»�e��t on the crdjacent fazrlt. These sedil�2e��t a��e ��eferred to here as po3aded deposits". Lastly, we also collected arad descr�rbed scrn��Ies of zrnweathered to slightly weathe�°ed allaivizrnt fi•o�ar the active cha�arael 1,0 17084 < k GebSolutions,Inc.,fVladonna Froom 5pecific P[an Area-Fault 6nvestigation Project No.SL09734-2 April 14,za17 raea�� �he easter�n portioTa of the srte. Tlaesc allu��ial deposits are considei�ed r�epresenlative of the pa��ent t��ateriaJs for tl�e soils described rn the h�ejaches. 'f Given that tlae su3face soal desc�°ibed rn Profrles 1, 2 a�d 3 rs lhoirght to laa��e develo�ed on eolian sedaments that ��ei•e f�7ost likely deposrted duf•i�ag the Jast gJacral maxir��uj��, al�pT�oxi�aaately 20-30ka, the soil devclopnaent age estimates calculated arsing the Dola� et al. (1997} regressions a�pea��pr�ovrcle t17e best age estir��ates for• the�e sarrface soils. Fu�"LI12f')120]"8, crj�d as cliscussed extenszvely above, lhe soil age r�egressions i�� Dvlara et al. (1997) s�etarr�rr the yoanagest age estimates for the soils we described i�a thc tr�enclaes. Sirace these soiJs ar�e thoarght to be exposed to coastal fog, aj7d are tlatrs likely to have fo��3�aed faster tha�� i; i: inland soi�s, the yozrragest ages seer�� to be ��rvst ap�ro�a3�rale for tl�is site. TabJe 2 (show�� below) szrj��f��arizes ozrr p�•eferred ages for the sorls desc�°ibed f'or this stud}�. Oarrl�referr•ed age fo�• tlae surface soil is co�astr�arned hel���een the rs7ininauln age retur•ned by the Dolan et al. {1997) �°egr•essao��s, and the age of the eolian sedif�terrts that lhrs soi�fo��naed. Asstrl�aing that these eolian sedinaents bega�� to be deposrted wherr sea level fell darr�ing tlae last glacial ra7axinzarrt�, llae '' soil cajv�ot be nro�°e tl�ar� aboart 18,000 yerns old. Thars, everr lhough the soil � �°eg��essiorrs�^etzn���ed ages si�rrftcantly older lhan I8,000 years, 1ve opted to cap � the age of the sar�face soil in all e.r�osar��es t�� I8,000 yea�°s. Fo�•the bu��ied soils, we claose to give a 3�ange of possible developnient ages �h«t stretch fi°ont the lowest ave�°age age returraed by the regt•essions to tlae "j�aiddle of the road"values that do rzot extei�cl i��to the 100,OOOs, i� Trrble 2:Prefer�r�ed Age E�7i�azates for tlte Soils anrl Soil Prn�les Described foj•tltis Stur�y Soii Preferred Develon�j1en1 A�e of I�tdividua!Soil Prefet�red.Age n� rle SoiJ Profrle I, Sznface Soil 11,aao-Is,aoo Soil ProfiTe I, I3uried Soil I 33�oaa-s�,000 Soil Prnf de 1, I3an•ied Soi�2 12,000-35,000 66,000-140,000 Soil Profrle 2, Suf face Snil 16,000-I8,aaa �Soil Pt�ofile 2, Ban•ied Soil I 28,000�-59,UUU �Soil Pj•ofrle 2, Bira•ied Sor!2 I8,000-�0,U00 62,000-117,000 ,�oid Profrle 3, Sarrface Soil 7,000-I8,000 �Soil Pi�ofile 3, Bi�j•ied Soil 1 25,000--83,000 Soil Profrle 3, Batf•ied Soil 2 19,000-��5,OUO Soil Profrle 3, Barf�ied Soil 3 I3,000-�3,aaa 57,000-1�8,000 Ponded Deposits 19,000-43,000 30,000-6I,000 To co��cla�de, �he��efore, the sarjface sorl rs a latest Pleistocefae to ear�ly HoJocene soil developed o�� �ate Pleistocef�e (MIS 2 - 20-30 ka) eolia�a sands. TJrose sands blanket a paleosarrface that fos•nred da��•ing MIS 3 (30-SO ka) that is naost likely colnposed of MIS 4 (60-80 ka) sedia�yeiats, u�hicla i�� tu�•ta overJie a�z MIS 5 (80-120 ka)paleosol developed u�on olde�� alluvial sedija�ents. Tlris tivould be the��ou�agest age i�ate�pt�etatior�for•all tlae zrnits. Based on ail initial pedologic (soil) anaiysis of the su�'�cial deposits exposed in a few of the trenches at the Mado�ina-Frootn Specific Plan Acea, the surface soil {coliuviti�n) is estimated to be latest Pieistocene to early Hoiocene in age, and overlies deeper alluvial and coIluvial deposits likely p�'e-Holoce�ie in age. Froin the information p�'eseilted by ECI, at� e�posures of su��face soils on the oldert• slopes are 11 '' 17085 I f ? GeaSolutions,Inc.,Madonna Froom Specific Plan Area—Fault Investigation Praject No.SL.Q9734-2 April 14,2017 co�lsidered less tliaiz l 5,000 years old (latest Pleistocene to early Holocene). For the lower sedime�its, a range of ages fi�o�n 30,000, 60,000, and 80,000 years old are the youngest age of these sedi�nents. Se�cral of these older alluvial and colluvial deposits aee clearly faulted. lt shouid be unde►stood that soii ages are �iot absolute ages and t[iat the so[1 descriptions do not necessarily apply to aEl soils encountered i�i the t�'enches. Some trenches may be within yaungcr sediinents and on younger geomo�'�hic surfaces that do not co�nply with the inte�•�reted geologic madet of ECf (2016). VIII. FAULT TRENCHING The following is a discussion of geneeal faulting cliaracteristics obset•ved within tt•enches and topography at the site. fn this discuss�on, footage jnarkers are referred to as along the t►'ench profiles as �neasured fi�om one end (typica9ly west end) of tiie h-eilch in the section li��e. '� Trench T-lA–Plate T-lA,Trench length approximately 100 feel–Assutned Recent faulting. � Trench T-IA vt�as exca�ated to intercept a break in slope between the flatter alluvia� deposits in the east and a cha�ige (increase) in topography toward the west. There is assumed ��ecent falxlting between station 50-55 (foot) region af the section where faulting appears to have deformed olde�• alfuvium {Qal) and thrust a mit�or poa-tian of Qa] ovee collu�iuin with deformation in colluvium (app�oxirnately l-2 inches of Qal defor�a�ation tlu�ust over colluvium). Assumed active fat�lt in this location. Tlie�'e is evidence for an older fauit {non-Halocene) near statian 15-20. Fault arientation is varied due to cotnplex and irregular pattern of faulting at station 50-55. Stcike of i�iferred Holocene fault is approximately NO2W fi�om offset in south wall of trencl�. The fault in this trencli is assumed to ilot be �nain trace of Los Osos fault as the fault is discontinuous ta the not'Cli of T-lA and south bcyond trench T-1B. BuiIding setback zone is SO-feet vvest fi•om station 50-55 wl�ich encompasses older e�nplacement fa«It witiiin Frailciscan Complex u�lits. Building setback zone on the east side of station 50-55 is 30 feet�vhich encompasses minor tilting in older alluvium but no reccnt faulting was observed beyond station 50-55. Trench T-lB–Plate T-1 B. T�'ench length approximately 250 feet–Assumed Recent faulting Trench T-1 B was excavated to intercept the fault in Trench T-1 A, to observe faulting attitude and I', cliaracteristics compared to T-lA, and to extend tl�e length of subsu�'face investigation toward the �vest ' beyond the termination af T�IA. The�•e is assu�ned recent faulting in station 170-175 region �vhere faulting appeat's to �iave deformed older alluviuin {Qal) and offset a mino►' portion of Qal and colluvium. Station 170-175 is along fault strilcc with the fautting interpreted at station 50 of Trench T�lA, as �nentioned above. Strilce of fault between t{�e two t�'enches was approximately NO2W. Assumed acti�e fault in this location. Some shears evide�it in Franciscan Complex fi�om app�'oxiinate station 30�- 140 but these sl�ea��s do not extend into the overlying alluvium ot' col[uvium. The fa�tlt i�i this tt•ench is assumed to not be inain t�•ace of Las Osos faL�lt as the fault is discontinuous to the�ioi�th of T-iA and south beyond trench T-1B. Building setbacic zone is 50-feet west fi•oin station 170-175, similar to T-lA although similat•defor�nation was not apparent in this 50-foot zone. Building setbacic zone on the east side of station 170-175 is 30 feet which encompasses minor tilting in older aliuvium in T-lA (althougla similar defoemation was not observed witllin T�1B). There is discontinuous setback as depicted on the fault inap feom t��enches T-lA and T-1B as �io evidence far fauiting was obser�ed no�th and sat�th of t►•enches T-lA and T-1B, respecti�ely. A north-northwest ptojectio�i of the fault woi�ld have intersected trenches T-5, T-8, or T-9, howevel•, no faulting was abserved vvithin t�•enches "1-S, T-S, or T-9. Siinila�'ly, along a south-sot�theast p�'ojectio�i,the fault would have intersected the eastern pot-t[on of trench T-7. Altlaough the fault could be zz 17086 � GeoSolutions,lnc,,Madonna Froom 5pecific Plan Area--Fault In�estigation Project No.5L09734-2 � April 14,2017 located fi►rther east of t�'ench T-7, geologic and geomorphic �•elations from trcnch T-7 did not s«ppo�-t faultitlg, 5outhern setback fi•om T-1B extended to SQ-feet fi•otn T-7 and no►-thern setback fi•om T-lA extended noith to T-9. Trench T-2A—Plate T�2A, Trench length app�'oxitnately I b feet—Assumed Recent fault'rng Trench T-2A was exca�ated to intercept a b�-eak in slope (as depicted on Plate IA) at this location as�d to inte�-cept p�►biished fault locations as depicted oi7 Plate 4. Thece is assumed �•ecent faultin� at station 0-5 region where faulting appears to have thrust Franciscan Complex ovet' older alluvium aiid possibly deformed tl�e ove�•lying colluviutzt. The stt•ike of the fault is approximately N20W with a dip of 14W bt�t va�-ies with exact location. Ti�e fault witi�in this t�'ench is assumed to he a main tt•ace of the Los Osos fault due to topographic expcessio�l (breaif in slope)and t•ece�zt faulting characte3�istics. Lettis Consultants Inteinational, Ine. (LCI) prepa�'ed a photo-mosaic and inte�•p�•etation o�t►�enches T-2A north wall, T-2A so«�1� wall, and T-2B nortE� wail (5ee attachme��ts within Appendix A}. LCI tre��ch T- i 2A south wall log shows faulting and a thicicening of Holocene to modea'n slope colluvi«m (age of thc soiE developed in the colluvium is approximated to be i 1.2 +1-7.7 thousand years old {ka}). The col]uviu�n is � faulted agai�ist Pleistocene eolian silt{age of this soil developed in the szlt is app��oximated to be 53 �1- 35 ka}. LCI trench T-2A north wall log shows faulting of the Pleistocene eolian deposit and possibly exterading upward into tl�e ove��lying Holocene colluvium. Attitude of fault o�'ientation as �napped by LCI varies with exact Iocation as seen o��the LCT log of this trench. The recom�nended building setback is 50 feet o��the west side (hanging wall)fi•om the fault at statio�� 0-5 a��d 30 feet east ft•om statio�l 0-5 in the trench. Although hencl�T-2A is only i 5 feet long,the abserace of faulting east of station 0-5 in the trench, coupled with the absence o�faultirag east of statio��s 75 to 95 in trench T-2B and stations 55 to 235 in T-7 support�s a 30-foot wide setback east in the footwall in trench T- 2A. T�•ench T-2B—Plate T-2B, Tt'ench Iength appcoximately 100 feet—Assumed Recent faulting Trench T-2A was excavated to iratercept a break in slope (as depicted on Plate lA) at this iocation, to verify faulting in tcench T-2A, and to �ntercept publislled fault locations as depicted on Plate 4. Tl�ere is assumed t'ecent faulting at station 70�75 of the t►•encls whe�•e faulting appears to have thrust Franciscan Co�nplex over oIder alluviu��� a►�d possibly deformed Holocene colluvium. The fault withi�� this trenct-► is assumed to be a main t��ace of the Los Osos fatilt due to topographic expt-essiora (b�'ealc in slope) and rece�lt faulting cl�aracteristics Lettis Co�isultai�ts International, Ine. (LCI} prepared a photo-�nosaic of this tee�sch with interpretation of units and faulting(See attacl�ments within Appendix A). LCi n'ench log�or t��er►cl� T-28 north wall shows faulti��g within Pleistocene eoiian silt with possib�e extension of fau3ting o�Holocene to modern slope coEluvium, Fault I�as an attitude listed by LCI of N34-SbW13b-4I 5W and another fatxlt witEi an attitt�de of N3 i W108W. The unde�•signed aiso obtained a fault attitude of N24-42W/42 SW. A fau[t attit�3de o� N34W/41 W was used for this study as an average attitude for the t�•ench. Variable fault o�•ie�-►tations are liltely due to "flowering" of fault as it reaches the surface. Building setback is 50 feet on west side (hanging wall) fron� station 70-75 which is adequate due to no deformatiora obser�ed within the Franciscan Comple�colluvium on this side o� the fautt. Suilding setback is 30 feet from station 70-75 on the east side from the fai�[t as there is little indication of defor�nation east of the fault(ionge�•trencli to noc•th(T-7)not showi�-►g fat�lting furtE�er to tl�e east). 13 17087 i: GeoSolutions,Inc.,Madonna Froom Specific Plan Area—Fault lnvestigation Project No.SL09734-2 April 14,2017 Trench T-3A—Plate T-3A, Trench length app��oximately 35 feet—Assumed Recent faultiug T3'ench T-3A was exca�ated to intercept published fai�lt locations as depicted on Plate 4. There is assumed recent faulting at station 25 of the t�•ench where faulting appears to slightly displace Ft�ancisca�� Complex and colluviumn. Fault attitude is approxi�nately NSOW140S but fauit undulates. There is a highly shea�'ed zone fi�om the l 0-to 25-foot region of the tE•ench. Tltiis fault appears to be a��nain teace of tiie fauit fi•om the coilective of i�ifortnation within h�ench T-3B also. Building setback is 50 feet o�i tl�e west side (I�anging wall) fi'omn the fault and this setback incl�►des the approxitnate 15-foot sheared zone west of the fault. Setback is 30 feet oil the east side of the fault as thei�e is little indication of defoi-�natio�3 cast of the fault(this fault t►•ench intersects with Trench T-3C). Trench T-3B�-Plate T-3B, Trench lengtl� approxi�nately 90 feet�-Assumea Recent faulti�tg � T�'ench T-3B was excavated to inteccept published fault ]ocations as depicted on P►ate 4 and to verify infoz•matioii within i�-e�ich T-3A. Thet�e is ass�tmed recent f�ulting at station 65-70 of tlie trench r,vhere ;, faulting appeat•s to {veiy sl[ghtly) displace tf�e base of the colluviu�n by thr•usting ft•om the undeE•lying �'t'anciscan Complex. The fault attih�de appears as N60W/$2N. This fat�It is coincident with infei•red Holocene faulting in Trencl3 T-3A. Shearing of the Franciscan Comp�ex rts evideErt in an appz'oxim�te 5- foot wide zone. The fault is apparent in t[ie Franciscan Complex at bottom of the trench as tl�is is whe�•e the strilce of the fatilt was obsetved. Displacement from faiElting is small at this location. Gene�al geologic coiiditions in this tz'ench exhihits colluvium overlying Franciscan Compiex hed:•ocic. This fa�tlt appears to be a�nain t:•ace of tlae fault fi•om the collective of infor�nation within t�'ench T-3A also. Buiiding setbacic is 50 feet on the west side and appears adequate as there is little indication of deforination fi�oin folding and fi�acturi�ig west of the fauit. Setbacic is 30 fcet on the east side f�'o�n the fault as there is little indicatioil of deformation east of the fault (as this fauit trencli intersects witEi Trench T-3C, see below}. Trench T�3C—Plate T-3C,T�•ench Eength approximnately 122 feet---no faulting obseivea. Trench T-3C was excavated to ve�•ify absence of faulting east of the fault obse►'ved witfiin trench T-3A and to intercept ptiblisi�ed fault locations as depicted on Plate 4. This trench exhibited Franciscan Co�nplcx of inelangc a��d greywacke at the base ovei•lai�� by a thick section (approximately 5 feet} of colluviutn that contained some caliche. Alluviumn r�vas obse�•ved in the easte�•n poi�tioii of the trench and consisted of cobbles aild pebbles in a clayey�saR�dy matrix. No evidence of faL�lting was observed. No setbacic is recommended; however the western e��d of the trencli lies within a reco�nmended sethack zone developed using t�-ench T-3A. �, Trencl� T-4—Plate T-4,Trench length approximately 110 feet—No Recent fau�ting obsert�ed. ' This trench was excavated to unde�•stand the fauit geometiy and rt•elationship between trenclaes T-2A-B and trenches T-3A-B. There is assumed olde�•faulting(not Recent} in the aliuvium fi�om station 65-to 70. Fault does ►�ot appear to displace colluvium. Attitude of fault is difficult to obtain due to fault not readily appa�•ent on opposite wall. Dip va�'ies due to sinuosity of fault, Due to tl7e complexity of the anomalous st�•atig►•aphic and st����ch.u•al relations fi-o�n statio�ti 65-70, Holocene faulting in this t�•enc[i is not precluded, thet•efore a building sethacic of 50 feet is establislaed on tE�e west side fi•om the fault and 30 feet on the east side fi'om the fault. Approxiillately ho�'izontal "bedding" (pebbly Iayers) of Oldez' Altuvium suggests t[�is is the easte�•n extent of faulting as bedding is 14 17088 GeoSolutions,Inc.,Madonna Froom Specific Plan Area—Fault Investigatian Project No.SL09734-� April 14,2017 not uplifted. Although no Recen!faulti�ag is obse►•ved withi�� tiiis tt•ench, similar development sethacks of adjacent trenches Lias been applied to this t�'ench. Tre�ch T�5—�late T-5, Trenci� length approximately 132 feet—no faulting observed Trencli T-5 was excavated to deteimine if faulting extended fi'om t�•enclies T-lA-B. The h�ench provided evide�ace for no recent faltlting and no cl�az'acteristics of faulting was obseivcd within this t�•ench. Older aituvium, colluvium, and�•ecent stream deposits exposed and no observable offset. Trench T-6 — FIate T-6, T�'ench Iength approxiTnately 250 feet although only eastern 200 feet weee logged a��d theil teench was backfilled hy mistake. Faulting observed in �ortion �tot logged at veiy r�vest termination of trench. Trench T-6 was excavated to Iocate faulting at the noi�th po�-tio�i of the propes�ty whe��e faLxlt locatio��s are ' publisfied as depicted on Plate �. Tl�ere is assumed faulting within a poa�tion of trench not logged but ',� observed by the «nde��sigt�ed. The location of this fault was deinat•cated in the field prior to (mistakenly) bacicfilling of trencli(fault location �napped on Plate IA). Fat�lti�ag thrusts F'ranciscaii Complex roc]<over ofde�• marine sand deposits (sand appears to be older than Older Alluvium, likely 100,000 years (?}, interpreted as marine sat�d deposits). �'ault attitude not collected due to bacicfilling of t�•ench. Pault is similax'to observed fault in tre�icli T-10B. Building setback is 25 feet on the west and east side of the fauit as the�•e is no evidence of�ecent fa«lting beyond defo�7nation of O1deE• Alluvium as obse�'ved iii trench T-10B located south of T�6. There is a contact of Franciscan Compiex metavolcanic rock thrust ove�• older sand deposits in a cut-slope located approxiinately 100 feet north of tE'ench T-6. The location of this contact,the obser�ation of the fault at the west end of trench T-6, aiid the observation of the fault i�z trench T-10B const�ain the fault in this arca to the fault iine depicted on Plate lA. Trench T-7—Plate T-7, Trench length appt•oxiinately 2�0 feet. Recent faulting observed T�•ench T-7 was excavated to i nte�•cept faulting fi-om trench T-1 B and verify Faulti��g observed in T-2A. Tnere is assumed Recent faultit�g at station 45 to SS it� the trench wiiere faulting appears to extend f�'om Franciscan Co�nplex into colluvium and thrusts Frat�ciscan Complex ove�'co9luviu�n. Fault o��ientation in the trcncl� is N27W/40W. This fault is coincident with topographic beeak in siope. No fautting fuz�he�• east within this trench. I3uilding setbacic is 50 feet from the western zone of faulting and 30 feet from the east side from the fault I as there is little indication of Rece�at defoi�nation east of tl�e fault. Zone of faulting is approximately 1 D feet wide. Setbacks are applicd from either eild of the zone of faulting. Trench T-8— Plate T-8, T�-encl� length approximately 50 feet—No faulting obse�rved This trench was excavated to ohserve if faulting extended noa�th froin tcench T-1A. No ��ecent faulting or characte�-istics of faulting were observed vvithi�i this t��ench. OIde�•aliuviuin is exposed in tlae trench. Trench T-9—Plate T-9, Trench le�igth appt'oxiinately 61 feet—No faulting observed This area was i�lvestigated due to topographic brealc in slope and to investigate extei7sio�� of fault obsez'ved in Trench T�IA. No cl�aracte�-istics of faL3lting observed witl7iza this trench. Ft•anciscan comptex and Oider alluvium exposed. 15 17089 GeoSolutions,Inc,, Madonna Froom 5pecific Plan Area—Fault Investigation Project Np.5LQ9734-2 April 14,2017 Trench T-14A�-Plate T-I OA, Trench length appi•oximately 80 feet—No faulting observed � This tE'ench was excavated to locate the fault obset•ved witlain 1�•encl� T-6. No rt•ecent faulting and no cliaracte�•istics of faulting we�'e observed w�tl�in this t��enct�. The tt'ench exposed O�cie�•alluvium ovet'Jying alluviat sand deposits and Franciscan compie�. Sand is inte�-preted as maeine sand deposits. Trench T-XOB—Plate T-1 OB, Trencl� length appt'oximate6y 90 feet. Faulting oloserved in Older Al[u�ium, no Recent faulting obsez-�ed. This trench was excavated to locate the fault observed within trench T-6. There is assumed faulting fi•om station 53 ta 64 in the t��ench although this faulting does not �ppear to be Hoiocene in age. Fatilting tht�usts F�-a�iciscan complex rocfc over o9der inat'i��e sa�-►d deposits but fauit does not e�tend into colluvium. ; Fault attitude is N29W/50 W. Faulting wiLhi��this t�•e��cl� is inteipreted to be the main trace of ti�e fault. ; ,, Building setback is 25 feet on eilher side of the fault as tl�ere is ��o ind�cation of defo��nation east in the � O(der Alluviu�n or west in the Franciscan Co�nplex. Setbacks az'e less due to no Rece�-►t faulting characteristics obscrved. Table 1, is a s�Emmaty of faulting cha�'actcristics witl�in the n�enches. Table 1: 5t�mmary of Faulting Characteristics FAULT ' TRENCH'. STRIKE AND DIP.. ' COMMENT NUMSER ,: , ... T-1A Attitudc va�•ies due to Faulti��g ap�ea�s to have defo�meci older alluvium (Qal) complex and it'�'egular ancl thrust a mino�-po�-tion of Qal ove��colluvium with pat�erR� in sidewall. Assumed deformation in coilu�iutn Recent faultin T-1B Stril�e NO2W, dip varies Faulting appea�'s to ha�e deforEned oldet'alluvium (Qal} from near vertical to 30 W. a�id offset a miilor po��ion of Qal and colh��iu�n Assumed Recent faulting T-2A N20W/14W although vaa'ies Fault th��tist F�ancisca�i Complex over older allu�ium a��d with location. Assutned possibly deformed coltuvii�m ; Recent faE►]f in . T-2B N34W/41 W �'aulting appcars to have th�ust Fraiicisca�� Complex over Assutned Recent faulti�� older alluvium a��d ossibl defo�-med coliuviuin T-3A NSOW/40S (?) Faulting appeaes to displace �'ranciscan Co�nplex ancl Assumed Recenl fa�ltit�g colluviu�n T-3B Fai�lt N60W/82N, ass«rned Ve�y slight displaccment af the base of the colluviu�n by Recent faulting thrusting fi•oirrz the uiiderlying F�-a�zciscan Co�nplex T-3C No faulting observed F�'anciscan Complex,Ailt►viu�� and Colluvium e�pased T-4 Faulting obse��ved,no Rece�it FaL�lt appears to offset Fz'anciscan Complex and Older faulting obsei•ved. Alluvium but not displace Colluvium. Attitude not readily apparent. T-5 No fau�tii7g observed Oidef�Alluvium, colluviu�n, and Recent stream depositis exposed 16 17090 i � k GeoSolutions,Inc.,Madonna�roorn 5pecif€c Plan Area—Fau[t Investigation Project No.SL09734z April 14,2017 FAULT ' T�NCH STRIKE AND DlP `COMMENT � N[JMBER ,.. , _ T-6 Fault obsetved(no attitude Fau1t thrusts Fz'anciscan Complex ovet'ma�•ine sand collected due to backfilling deposits of treiich by mistake).No Recent faulting T-7 Fault N27W140W Faulting appears thrusting Franciscai7 Complex over Recent faultin observed coiluv[um T-8 No faultiE►g obscrved Olde��Alluvium and Coituvit�m expased T-9 No faultiiig obse�'ved F��a�iciscai� Complex, Oide��AllLxviuin, and Calluviuin ex osed T-l0A No faulting observed Oider Allu�iwn ove��lying mari��e sand deposits (beaclti sand} �; T�IOB Fault N29W/SOW Franciscan tlirust avei�marine sand depasits(beacl� sand}. Fat�lt not considered Recent Fau1t does not extend into colluvium 7X. DISCUSSION AND SETBACKS It is understood that, although the subjcct property is ziot mapped as within aii Eaethquake Fault Zone (formecly Special Study Zone}, the��e is an Eat-�liquake Fault Zone map for an area of San Ltiis Obispa that is located approximately 8,000 feet izorthvvest of the Madonna Froo�r► Specific Plan Area{see Plate 2 and Ptate 3A}. This fault investigation was conducted as a due-diligence because of the near-by Earthquake Fault Zone map, tEie prominence of tectonic geomoiphology, and prior p�Eblished geologic mapping depicting potential faulting at the prope�-ty. Special Paper 42 {2007), states (p.27, section 36D3}: No stra�cture fo�� l�irsara�7 occir�a��cy.... Shall be perfnitted to be placed acr�oss the t�•ace of ara active fault. Farl�the�°t�ao1•e, as th�a�^ea within frft�� (50)feet of szrch active faults s1�aII be presul�aed to be uj�det�larja by crctive bf•anches of that fault utzless p��ove�� otherwise b a�� a j�o r�iate eolo ic rjzvesti atror�.... The preinise of this study was to tocate the tz'ace of the Los Osos fault through the site and p►'ovide adequate building setbacl<s based upon the app�-op�iate geologic investigatioil and suiveyed iocation of the fault and deformation characte�•istics af the subsurface geologic units. � Bray, 2009, states "Ground defo�'Enation is not unifo�mly distributed on cach side of a dip-slip fault. � Sign[f cantly more ground defor'mation occ«rs over the hanging wall... Thus, setback distance from the prima�y trace of a dip-slip fault should not be at'bit�'a�•iIy the same ainount on each side af the fai�It. Gi'o►tnd wa�•ping and seeondaty ground ruptu��es a�'e most sig�Zificant over the hanging wall of dip-slip fauits {i.e., o�ec the uptlu'own block for reverse faults" (p.1273). Bray coi7tinues, "To pcavide some ievel of consei•vatism, the often►r►isunderstood 50-foot setback c�•iterion was also added. It reqt�ircd that an ai•ea vvithin SO feet of a trace of an active fat�lt shall be pres��med to be underlain by active branches of that fault unless proven othe�'rvise.... If an appropriate geoiogic investigation demonstrates that the geound adjacent to an aclive trace does not contain active braz�ches of that fault h-acc then a st�•uctu�•e�nay be sited directly adjacent to thc prima�y trace" {p.1276). Bray states "One af the prima�y deficiencies of the eti��'�'ent version of the A�P Act is that it p(aces all active faults in the same catego►y. lt is not reasanable to tt•eat the pri�nary trace of the San Andreas fault,which could have ineters of move�nent across it,the same 17 17091 GeoSolutions,Inc.,Madonna Froom 5pecific Plan Area—Fault InvesCigation Project No.SL09734-2 April 14,2017 as an uR�named miEso�� bending moment fault tliat ►nay have moved once En the last 11,000 yea�•s a few ' centimeters" (p.1276). Fui-�I�er, "Ground defor�nations associated with sut'face faulting a��e not equally dist�-ibuted on each side of tl�e fault. Hence, the enginee��ing geoiogist should wo�'lc toward inteip�-et[ng the geologic information to establish non-a�bitra�•y setbacics base on specific site, fau[t, and soil ; � characteristics." Setbacics are described in Earth Systems Pacific (Feb�'uaiy 28, 2000} for the Los Osos fauit in the area located approximately 8,000 feet north of the Madonna Ft•oom site (Earthaualce Fault Zone} whet'e faulting was observed within Pleistocene to late Pleistocene age uniks (wi-►ich are not conside�-ed to be active). T11e potential fo�� diffe�•ential (horizo��tal a��d vet'tical} mo�ement was stated and geound cracicing could occur along these faults during strong ground shaking from an earthq«alce event. BuiIding setbacks were a tziiniinuin of 25 feet f�'om seconda�y antithetic tluust faults on tftie l�anging wall blocic (up- � �; thrown}..., and 10 feet on the foot wall. As faulting charactet•istics within the northern section o� Madonna Fi•ooin {vicinity of T►'ench T10-B) do not appear� to be Holocene active, the 25-foot sekbacic on either side of the fau[t within this northe��n section a!!he Madonna Froom a�•ea appears adequate. Saiz Luis Obispo County Guidelines fo���ngineering Geology Reports {Sa�s Luis Obispo County, i�pdated Octobez•, 2013) suggest a fau�t setback calculation where tl�ere aee "widc disc�'epancies iil faull setback ',� recotzimendations". For coz�nparative puEposes for deve�op�nent setbacks at t17e Madonna Proom site, San ';� Luis Obispo County suggests utilizing the setback calc�:lations by Batatian and Nelson (1999). Tlie Guidelines for �ngineering Geology Reports states "tlse fault study repo�-t shouid use this method to establista !he recommended fault setbacic for critical facilities and sh-uct«res designed for human occupancy." Miniinum setbacks ai•e also provided and "tl�e gceater of the two {table listed setback or j: calculated setback) is the setbacic". The setbacic caiculation method equation is S = U(2D + F/tan6) where S=setbacic, U = c�'itically factor {based on table info�7nation, 1.5 for single family residences, 2.0 fot' coinmercEat structt�res), D = expected displacement of tfie fault, F = footing depth, e � dip of faulk. Usiilg the parametez's of U = 1.5, D— 0.833 feet, A=(high— 82 degrees {tt'ench T-3B}, Iow� 14 degrees {trench T-2A}), F = 3 feet, the equation yields a building set bac�C of 3 feet i�1 the high ailgle fault{T-3B}, and a building set bacic of 21 feet in the low angle fauit (T-2A}. Mini�nu�n fault setbaelc as �isted in San Luis Obispo County(Octobe�•, 2013) is 15 feet for a single fainily home. Plates lA, 1B, and 1C depict geologic conditions at the site, the location of explo�'ato�y trenches excavated dui•ing this fault investigatioil, and the Los Osos fault tlu�ough the site. Reve�•se fauIts can be discontinuo�:s (as observed witl�in the Eartl�quake Fault Zo�1e map Iocated approximately $,000 £eet to the no�-th of the site} and as such, this fault investigation has shown t[iat the Los Osos fault th1'ougl� tl�e site is discontint�ous (active faulting, older(QuaternaE•y) faulting, and locatioii of fa«[ting varies [e, Tl-A, T-1B}. Su�'face expression including topographic exp�•ession (scart'ps) were o6se��ved and investigated during this study. Deveiopment setbacics a�'e provided on Plates 1D, lE, and IP and are based upon age of offset {in relationship within the geoiogic unit},tlie ci�aracteristics of faulting (u�-thrown block i�1 relation to dow�i- dropped bloc�c, dip angle}, and displacement of geologic units in a discrete iocation or"zone" o�faulting. Where characteristics of active faulting was observed, a 50-foot development setbacic was established on the hanging wall of tiie fault. The hanging wall is ti-►rust over the footwa[1 block and typically incurs a ' wider zone of deformation co�npared to tlie footwall due to compc�ssion. Deveiopment setbacks arc , reduced on the footwall side of tl�e fault to 25- and 30-feet and a�•e based upon little to no defo�'Enation on ' this side of the fault. It is noted that this setback assu�nes the lowest dip angle of the fauit which is an add�tional conservative eletzie►�t (utilizing the San Luis Obispo Cotmty Guidelines for Enginee��ing Geology Reports fault setbacic calcuiation} because the lowest angIe is observed within one fault t�•ench at 18 17092 � 4 GeoSoluYions, Inc,Madonna Froom Specific Plan Area—Fault Investigation Project No.SL09734-2 April 14,2017 the site. WI�eZ•e fault defo�-�nation has been obsei•�ed to be in a zone (fau�t treiich T7), the setback para3neters wet•e establislied from the ends of the zor►e. As the Iocation of the fault in trenches is accurately known and surveyed(not an"infez'x'ed" location), and deformation has been accurately mapped and assessed, the fault setbacics provided herein aE•e appropriate for the development. The quantity and Iocation of trenches excavated at the project are appropi�iate for the cur��ent pz'oposed developine��t as depicted on Plates 1A-1F. Local changes in fault orientatio�� and dip shoutd be expected but has beeil captu�•ed by the uncertainty limits in the fault setbacks. As a conse�•vati�e element, fai�lt traces obsez'ved to be oldei•than Holocene agc mai�itain a minimum 25-foot setback o�i each side of the fau[t as a facto�'of safety for the possibility of horizontal and/ot• vertical movement during coseis�nic rupture or strt'ong g�'ound shaking (a 25-foot setback is established in the not-Ch portioE� of the p�•operry in the vici�lity of trenches T-G, T-10A, and T-I�B). Intt'a-formational faults o�' shears observed within the �'ranciscan 3 Cotnp�ex rocks are considered inactive due to the late Jut'ass�c-Cretaceous age of the rocks. It is assLimed � that where a fault is identified i�� a t�'ench and offsets tl�e surface soil or a near-sueface soii, and is cot'i'elative with tecto►�iarelated geomorphology {ie, brealc i�� slope), it is assuined to be Holocene active, ''� Sitz�ilat�ly, whe�•e the landscape has been �nodified ti�rough antl�t'opogenic acti�ity, at�d the sut�face soi! is 1 disturbed or missing, it is ass«med that the fault encounte�•ed wit[iin the h-ench is potentia]ly Holocene active. Tl�e resulti�ig setback map suppot'ts the intet•pretation of Holocet�e activity at the site. X. CONCLUSIONS and RECOMMENDATIONS I'or this fau3t investigation, a series of 10 sets of fault trenches {15 individual trenches totai) were excavated at the site to locate fhe Los Osos fault through the Site. Tl�e fault exhibited c�ia�•acteristics of acti�e �nove�nent (move�nent within the last 11,000 years before present or Holocene in age, offset in colluvial sediments), Quate�nary age (Iast 2 million years before prese�at) movement, and pre-Quaternaiy move�nent {movement prior to 2 millio�� yea�s befo►'e present). An �nginee�'ing Geologic Map of the site is depicted on P3ates 1A, IB, and 1C (Plates 1B and 1C are et�largements of Plate lA)wl�ile develop�nent setbacks fi•o�n tl�e Los Osos fault are p��ovided on Plates 1D, lE, 1F {whe�•e Plates 1E a��d IF are enlargetz�ents of Plate 1 D). The Los Osos fa�►lt zone maintai�is a broad and disconti��uo«s complex rupture pattern typically associated wi�Ei reverse fault zones. From se�erai existing t�•ench exposu�'es exca�ated at the site (Treliches T-2a and T-26), it is interpreted that the Iate Pieistocene-Holocene surface soi9 (coituviutn) has been displaced by fa«lting or anomalously thin�7ed and thicicened near the fault zone. It is assumed that whet•e a fault is identified in a trench ti�at offsets the surface soi3 0�� a near-surface soil, and is cor�'elative with tectonic-celated geo�no�'phology (ie, brealc in slope), it is assurned to be Holocene active. Si�niJa►•ly, whe►•e the landscape has been modified through aztithz•opoge�iic activity, and the surface soil is disturbed ot• missaR�g, it is assumed that tl�e fauit enco«ntered in ti�e trench is potent�ally Holoce�ie active, Faulti��g that does not affect sueface soils appears to be non-Holocene in age. This Madonna Froom Specific Plan Area fautt study has maintai�ied a conset•vative approach utilizing de�elopanent setbacics where faults are appaeent in lower sediments and older aIluvial seditz�ents although these lower scdiments and olde�' alluvial sediments are non-Holocet�e. Development setbacks ai•e also applied in ax'eas whcre surface soils ai�e i��terpreted to be disttirbed fi'o�n faulting. The followi��g are recommended at the Madonna F►-oo�n Specific Plan Area: 1. Develop�nent of habitable structures, i�esidences (single and inultifamily) and residence garages, critical st�•uctu�•es (ie, cellula�• towe�•s, «tiIity buildings), ca�•e facilities, and buildings occupied more than 2,000 hau�•s per year are recomtnended to be developed otirtside of the 19 17093 € GeoSolutions,Inc., Madonna Froom Specific Plan Area—Fau1t Investigation Project No,SL09734-2 ApCil 14,2017 fault development setbacks as p�'esented on Plates ID, 1E, and 1�'. �'ault setbacics va�'y depe�iding upon locatiosi with develapinent setbacks rt'anging from 25 fcet to 50 feet. ; 2. It is t•eco�nme�ded that the �•ecomme�dations within GeoSolutions, I�ic., April 14, 20I7 Preli�ninary Engineei-�ng Geology Tnves�igation for the p�•oject site be incolporated it�to desig�a. END O�'T�XT , s9i ,`� '� '� '� 20 17094 Geosolutions,Inc., Madonna Froom Specific Plan Area—FaulY Investigation Praject No.SL09734-2 April 14,2017 REFERENCES Batatian, L,D., and Nelson, C.V,, ]999, F'ault setbacic rec�uire�ncnts#01•educe ru�ture faultii��haza��ds in Salt Lake County [abs�: Association of�ngineering Geologists, Program with absteacts,42"`� Annual Meeting, Salt Lake City, Utah, p.59. Bray, lonatha�� D., "Designing Buildings to 1lccommodate�a�-�hquake Surface Fa�ilt Rupture", i» �1TC & SET 2009 Conference o�i Improving the Seismic Perfor���ance of E;cis€irlg Buildings a�ld Ot1�er Stt'«ctuc'es. Profcssor, Depa��tment of Civil and�Elvironmental Engi�ieering, Uiliveesity af Califo�•��ia, Berkeley, CA. California Geological Su��vey, 2002,Note 49, Guidelines for Evall�ating the Hazaed of Surface Fat�lt Ru�ture. Earth Coi�sultaa�ts inter��ational, Noveinbei• 18, 2016, Re�ort—Soil St��atigraphic AssessYne�its i�� Suppoc-t of a Study to Characterize the Activity af Sh�ands of the Los Osos Fault Exposed in Trenches Aloi�g tl�e Los Osos Valley Raad, in 5an Luis Obispo, Cali�o��nia. �CI Project no. 3613. E�rth 5ystems Pacific, Februa��y 28, 2000, "Supplemental Fault Invest�gation Iteport", Irisli Hijls, Ta'act 2270, APN 067-221-044, (Foi•mally Lot 8,Tract 1053), San Luis Obispo, C�lifornia. Earth Systems Consu[tants, Octobe�'29, 1997, File No. NGS iQ709-01, "Fautt Stuciy, Eag[e Hardware anc� Garde��, �'o�-tion of Lot 68, Rancho Canada De Los Osos, County of San Luis Obispa, California". Earth Systems Consulta�ls, Octobex' 7, 1997, Geologic and Sails Study, De Vaul Ra��ch, Madonna and Los Osos Val[ey Roads, San Luis Obispo, California. GeoSoiutions, I�fc, .lanuaiy 27, 2000, Geologic Fault i�ivestigation, Irish Hills Developtnent, Los Osos Vailey Road and Mado��na Road, San Luis Obispo Area of Sa�i L�i�s Obispo Couilty, California. Praject No. SL01321-2. GeoSol�itions, inc.,April i4, 2017, PreliminaEy Ei1gi��ee�ing Geoiogy lnvestigatio3�, FY•oa�nl�l Villaggio Speeifc Plan, APNs:067-241-a3D ai�d-031, San Luis Obispo A�•ea, San L��is Obis�3o Co�nty, Califoenia. P��oject No. SL09734-1. Hall, C.A., 1973, Gea]ogy of the Arroyo Grande 15' Qi�ad�'angle, San Luis Obispo Co�mty, California, CDMG Map Sl�eet 24. Hall, C.A., Prior, S.W., 1475, Gealogic Map of t11e Cayarcos-San Laris Obispo Regio��, San Lui� Obispo County, California: U.S. Geological S��rvey, Miscella�ieo��s Field Studies Map, MF 686, �caie 1:24000. Hall, C.n., Ernst, W.G., Prior, S.W., and Wiese, 1.W., i979, Geologrc nacr� of'�Saia Luis Obispo-Sa�a ��`irl�eo�a Regror�, California: U.S. Geological Survey, Miscellanaous l�ivestigation Series,Map I- 1097, Scale 1:48,000. I<MZ files, 2017,fi•am USGS websiEe htt��:1/1�s4�s.�ithul�.io/shal:e�yfau�roducts.html#�r�oo�le-carth-overlax Lettis, W.R., and Hall,N.T., I994. Los Osos fault zone, San Luis Obispo County, California: in Alterman, I.B., McMullen,R.B., Cluff, L.S., and Sleminons, D.B. (editors), Seis���otecto�7ics of the 21 17095 GeoSolutions,[nc.,Madonna Froam Specific Plan Area—Fault Investigation Project No.SL09734-� April 14,2417 Centa'al Califo�'nia Caast Ra�ige, Geological 5ociety of Ainej�ica Special Paper 292, pp. 73-102. Lettis, W.R., Ke1sa�1,K.I., Wesling, J,R, Angell, M.,Hanson,K.L., and Hall,N.T., 1994. Quaternaey deformatio�i of the San Luis Range, Sartl LLllS OE715�]D COLlil�, California: in Alterman, I.B., McMullcn, R.B., Clu#'f, L.S., ai�d Sle�r►mons, D.B. (edito�•s), Seismotec#oi�ics of the Central California Coast Ranges, Gcologica[ Society of n�nei•ica 5pecial Paper 292, pp. 111-132. PG&E, Januaiy, 2011, Shoreline Pault Zoi�e Re�ort, Section 3 Regronai Tecto��ic and Seismic Setting, Report to the ll.S. Nuclear Regulatory Coir�rniss�on. PG&E, DC�P Mapping I'raject, Re�ortNLimbe�•: GEO.DCPP.TR.14.0], dated 6/3 012 0 1 4. PG&E, 201 1, Los Osos-Ed�ia Val�ey,LiDAR data, Ope�7 To�ogi-a�hy, http://w�vw.p��e.coml»�vUusiness/edusafety/�ystemwe�rlcs/dcu�/SSHAC/le�v doc�rme��ts/datasetslin dex.sl�tml Sail Luis Obispo County Planning and Building Depa��tment, Januai�y 20Q5 (�ipdated October, 2013), County Guide]ines foa� Engineei-ing Gcology Reports. 5tate ofCalifori�ia Special Studies Zones, San Luis �bispo Quadrang]e, lanuary l, 1990. 5tate of Californi�., �pecial Pubiication 42, Interim Revision 2007, Pault Rupture I iazard Zones in California, Depart��ent of�onservation. Treirr�an, Jerame A., Januaiy 23, ]989, California Dfvision of Mines and Geo]ogy Fault Evaluation Report�'�R-2Q0, Los Osos Fault Zone, San Luis Obispo Couniy. Wiegers, Marlc O,, 201Q, Geologic Map ofthe San Luis Obispo 7.5' QLiadrangle, Sart-�Lliis Obispo County, Califoi•nia, Califot-�iia Geologic St�rvey. Wiege�•s,Ma�i< 0., 20I 1, P�'eliznina�•y Geologic Map of the Pistno Beacl� 7,5' Quad�•angle, San Luis Qbispo Cou»ty, Califo�•nia, Calirornia Geologic Survey. 22 17096 I � PLATES I: PIates IA, IB, 1C - Site Enginee�•ing Geologic Maps ' Plates 1D, lE, I F—Site �ngineering Geologic Maps with Fault Setbacics Plate 1 G—Site Cross Sections Plate 2—Eatthquake Fau1t Zone Map (State of CA, I990) Plate 3A, 3B —Lettis and Hall, 1994 Plate 4—Superi�nposed Fault Map Plate SA, SB -Regional Geologic Map, Hall, 1973 and Geologic Explanations Plate 6 -Regional Geologic Map, PG&E, 2014 and Gealagic Expfanations Plate 7A, 7B—Regianal Geologic Map, Weigecs,20I 1 � i � Plate 7A,7B-�Lettis &I-Iaii, 1994 and Gealogic Explanations � Plate S—Google Image with USGS KMZ faulting—2016 Plate 9—Regio�sal Fault Map, Jen�ii�igs, 2010 and Explanations ; Plate 10A, l OB - Regional Geologic Map, Dibblee, 2006 a�}d Geologic Explanatiot�s Plate 11 —LiDAR Image- 241 I Plate 12—Lettis and Hall, 1994, Location of Los Osas Fault Seginents Plate 13 —USGS—KMZ faults in Eaitliquake Fault Lone Ai•ea 17097 .,� i � G �,�� ,� � �� _ .,. � -v`, , r•_ /�^ �,�. ���/ � \ �\:`: \ ;`� •"`_� ,� �fl�� '_ \ �\\�; ,Y , ' :� ,,l _ ��' --/ ,✓\,{. � �.� �-�� �, �� ���- '�� �� � ,� -J �:�. `;:��. ��'/' \ � �;` �;�� � �� ;h � �_ `� .,�: � ��� � � �\�:: � ,��� �;, t� � � � �, � ti � � �; � ; �- '� �; �,:� � �� B-1 � � / ��`\ .. �� �.v� � �. , ., 47 \ �;�'� _ _ :..✓� -� ���-�_�. . • \ 1 � ��� -�>� n --' `� v�/�y/ 6 ' // / . \ � T / \: ��� �A S�, - _ IC!�aii .�4�\� �. `�.' 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E (_ I i I I i � __, � ...., !.._ I - _ _ �_.� f _._ � i �-/� i i i � i �.. f'- --_ ±i I._.. .- - — -. _. ,.� I l ._w ^ I I.. _+__.. ..,.. . i ___ _ . ._... . � _ __._ ....._... - � . . _,. . I . — -- _.. � .. _I . ' �, I_.�_ , , — "'--� ..Y" '....". ..,. �,�!— ! I i �� V1 ..._ � � � ` i 1._- _ ....— i I I — ` 1_I J_ �.�— o Q '-'� i i � �, a , � , � � --�_ �� � � � � �� i � � � � � xz w _ � , � , � � � ; ,� , - , � --� _ ; i I — - , i I i- ' ' k _ { � U r� � �f� KJls � � ---.i�t ; � _ -- - i i -� _' � � i i � � � - - '��' � ._r I f . � � , f ; ' �--��-i i i - _ y< � � w _ �; - _� _ �1 ; � ,sEc i I � r ^ � {� ; � �._. i i —.� w. __.—. ��,.__ � I._ .�,__ ; ; �i10�9�' `_ __ ? 1 I � ��; � � �. I i I �— ,... -- , i 6 i i i i 1 _— � w � . i . ... � - � .� ..._.,- . i I _.L__ i� �r i i f I � i . i ' ;_ ., . . ` I I —' ---- � ' � ��.2 B-3 �i i li I — ��,s i i s - �— - � � I1 i i — , ' Q I � p . I S I. -�. I -- � � �t � I ; . hJ1s . ` � � i i i i � I � � _ _ : o; i 3 i � I i i i i � i � i i EFt �D��OF} c i J — � O .. ..I. , ;.. �. ..1. ��� � . , ` � , , i � i �i i !, I—I—I—' � i I _ I : I . .V . I t I__"_:.. o L�i. r�KJmv �' � nr . � i � I. I. �- � `. ; , r TDQ�46 d! � _` - � i � K.1m� KJs 7`�----^a�1�_.�-�-- -- ca"i� � . ' •� - __.. _ � ..��- +` . . .. -- . _` , ��.....6tvl-.— 1�� ---�� la�al— _ --,— b� .-. I :- __._.. ' . - ' .. . . - ' - � { I 3 .. .�_ — � ." _ . __-: : .� O Q �ti I " I I / —�G... �� �, r .._+ , __ .�_.,.. �._. ...,._ -� -� - �. . '����.. ..' . - ''�.. %�/ � n�s : i ��. �, i : ' ' i � i-�—i—�� : . .i i�--i � � . --' -��. � �—v'� � �i� i i i i�i�"�'i�r—i : a � i , Klc �.� .. _�_1 ��'� � 0 i h � 3� ,.!— ._ .. .t .1, i ' � �_[ � J _ . . �.�� �.�_ ' - n.is .::_�+ ., i,i.. i'_��—o �"�i'_'�._5�T"—i—'__—_,,� . r , i+00 2+pp 3+00 �1+60 � 5+D0 � 6+00 7+{70 8+00 9+00 10+(1{1 1 1+�0 12+L0 I 3�(]0 14+U0 I S FU(} 16+{�{1 1 7+pp 18-�0� 19+00 2D�OU 21+00�22+0[l 23f[}U 7 A+(}0 15.00 26+0� 27+()0 28+DR 29+00 30�C�G 31+-pp 31+�}p 33+p{] 3�t+�0 W 0 � SCALE IN FE�T � Q � Q � `++ � d � � 6-I � a 2 TDc�s I 0 fl B' W � g �3 SECTION B-B' T�i�46 ft Offsef-240 NE of Seclion � — 13D.0 I 130. D 1'07 - _ q�lilital Fill(AF) — — �?�� � 7120.� - -- — LEGENd �hy � - __ -- _ — 90.0 � Artifical Fill ti/ a��� — — -- - — Qal Alluvinl Mnterial JtC1Cl.q — --al OO.tI � KJfs,KJfm� Franclscan Complex r� "' 90.t? — ' �- — - I — ��(7 _?- ConlacE-?where unknown �yS �0.( -- -- — -- _ .� _ �_ �= FJO.(} �G _ � _ _ _ `____ ____ � __ _ ��� , �irecfion/Movement 70. — - -- -�--__- �-- --- K�is .—_._ —{ _._.I �I�.I_K.lf — T ����r ��ClIS� W I f—..� - -- I__.._ 60.0 6p I L�.l.:_.._L_..� �� = � �-- --�� �� Harizontul scale exa erated j+�ir3 3.+�p qkpal S+Op �+p0 /�UO 8�uf3 1��00 I t7,i�Lr 1 1 tOD 1� �Vn 1'1+u�i 1 4+pp 1.5+00 16�00 17�+00 I 5+0� 19+flp '20 E�00 21 tUD 99 SCALE IN FEET °�`5�• �`N� .�' Dip AngEe � ¢ �a 5 ��d �ow o J � �zwz w � 2 �wu � tiw �iss��O�d. y,�Q � N � � M � � � � � r. � � n M pQp � O� � '�"� d X O � w '~ o � � � � �' M �[ � � � � Q � �*1 � n '� � O � � � 17� o c o �� N c%� °� € � - f+AAP EXPI.AI4ATIOh1 .. Acti�e Fnulta Faufts considered to heve rieen acdva during Holocene t'Eme en�i to have a 790� relAtively:high patenYiolfor surfece ruptute;sotid tino where accuroioly iocoted, r-�y long dash where epproximately locsted.short desh where inferrad, datted l % , ,, U. ., �. �-1���y _ .. where conceeled;quary�7k indicatas'edditianel uncertainty.Evidence of histor- " .,.��� �aK�� j���'�� �V��� � "+ ` } "'�•7•• ic of(set indicated b;�year of earthquake-associated event or C tor displec� � a�`�\ !� ��y�i���� �,� �� /� �A��,� ment caused 6y creep or possible creap. �"� ��`,�'�\����'���j ~~��� � ��.' 6pecfel StudioaZono Boundttrles I� ��� 8����� � ,��j � "'i� ,j �, ! �p� �������',?� � �/ \' �� These ere delineeted as straie��-�ine.segments ihat connect encircled tuming 'Z�„r8z ,� :•. �� : points so as to define special stvdies zone segmenSs. � ``......._ � `� `--- `\�'•...., / . . � -� �„.... .�_ ' '�r, :1 i .. ,�,� . ,. . , � /•.16J.....,. _ -" I; - � � � f- _— �4 ^ — Seaward projecti_ ot zone boundary. , �� � ��� > -0 / • --. .... . j'• ��, r �. �./. . � �,J ` ` `,,��; - '+,�� •...�/� ....� ��,,,,,on i � �. ��' ��`-,-7 t � � • ._.,?�,�,$'/S <'�� '��'';�i � �� �y y,Q�, :��-*\\J`�,l '�`. �' �( \� �� ��.-.�l'.'--e��� 1;� � ,`� �� .� � r � ' �`�•i•' i ��`�'���i:� \ `_T i rS ��n��\\�`` � ���� �� / �y���'�-"�,`, �..,� / {� ^� �je. �`F�'�� � ��1 -.��:1•_,}q.�` �- ��-1_" f '/ �r'�>� ��'i'Zi'�. � f� ��tnr v/�:�` . � } � fS� `Jr"'��_ti �{ L,�'\�* ����� . ��^ � 1 ~�1�. � ���`e'�`....� ' r� �"'\. � �'.. .�r • d ` L�� 1-`�,, l i � i.. �',u,h,r'?e,� _ ��,�,//.•.s�, ., r' � f,(la -�y .�_l f `�^�� �r��f �• x.� -F-- �''�. y>`, r -r `�` <}, / ��.` • _ f �Q/�'d ''Jt .� 'c� �\ `�`e� ��p � I/ } ``• '�����.r �.�ti� � -� � ! �1 1�_ � `�` � /! \,'� . \ f i 4 ' � / J` '�� "1 Y "�;-f\�' v� „f� y �.f -.,�`,/\ �� �,� �C Fh ���.��\�'_..�--�.^.�C;t ��� � 4�S\, �.y �/�'.. l27f ' " � � ���' \ 't� .. v � �\ /.+ � �..' � k' ` y}' .� �� ` �, y�\ �.,'_�'1_^ f T' �ti A ,1 , y �'.� :.�'�. t �__, �.�: �\�� � _\� -�-.��'�`)� . l f ���- � �•a �� i'�. i�;�,�v.��r ��_` -� r�� ��` '. ` �,"�l:-:� ` '1�� ��.::\ _ �\�..-.�i r�� `'�" ��'� � �-)6tl""` ''` ', �'�\\ IZ / Z�` '� )� �V � k r� �� �. 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C �� ��qo f �.J a4���4 16� \ , ` ., �\ d�`� ~ a� d�,��-Heweam�Rldge� �� ��� � -Sub6loCk Madonna Fraoin Site o� �,� `� .. , , . � \ c0.60 c@4'O>`��``��0 16' �' `�\ �� �:�: � �GG�� �' � `� .,` 95°00' � S���q ~ �\ _����35 00_. � , ` �, = t 1 r,�� � ��' G # `�.,...' ��-v sa„�a `,�`.: � � q� I+�arfa fl 1Qkm �°�o � - � � � � �S�a�. ��Y �� �a � � � � � Point Sai a�q i zti°ao• � �zo^aa• - EXPI.ANATION -'����^Fault:dashed where approximataly Ivcaled, 0.76' Uplift taie(m�ityr)trased an ihe aliitude astimated lesth Ind'Icate dlp direotidn o!reverse faull, ag0(^S6fl ka}of tha Q7 marine terraos{Hanson arrows indicaie relativa sense ot displacement e!al.,lhis volume} x�'" Interred atruclural basin;may or may not ba _�+��� S1ruCtUYaily complex zane � � x� boundecl by faults 0,2s Lale Pieistocene(post-12o ka)uplifi rate(m�kyr) Figure 2.Reg�onal map showing segments of the Los Qsos fault zone and]a�e Qua�emary upl"sft rates of[he San Luis/Pismo svuctural block. 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Photo Log of Trench T-2B No1�th Wall - Lettis Consultants Iiiternatioi7al, Inc. Plioko Log of Trench T-2A South Wall -Lettis Consultants I�itei7iational,Inc. Earth Consultailts Inte�'national—Nove�nber I 8, 2016 repo�'t Ea�'th Systems Pacific,Feb�va�y 28,2000—Portion of report Earkh Systems Co�}sultants--Octobe�•29, 1997—Po�-�ion of�'epo.t't GeoSolutions, Inc.,- .ianuary 27,2000 —Po�-tion of��eport Earth Systei�s Consu[tants—Octobe�'7, 1997— Portio�7 of eeport 17121 i `s 1 ..(, � � 71-A . I � ����� . ? 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SL,�g�34�� S��Zt� M�ria, Cll 93��5�1 PROJ�CT II�FORMATION DRILLING IN�'ORMATION PIZOJEC'f'; MadoE�na -I+�•ooiz} Ranch DRILL R.IG: l�lobile 1�-2�1 DRTLi�1NG LOC�ITION:See Figin•e 2,5ifie Plan I�OLE DIAMETER; 6 Iaaches D�1`r'E L7]ZTr,L�;L7: May 18,201b SAMPLING METHOD: Sl''T a��� CA LQGGFD SY; G'I"V HOLE�L3�VA7'ION: 1�T�t Rec��•ded � Deptl�of GroL�nclwater; Not�►icouute�•er] Bori�lg Tanni��ated At:�0,0 �'eet Page 1 of 5 �" � w a � ,� � � s. � � z � � � Q ° z � ti �, so�L�H�scizfY�-�or� � � '° � z� s � �' �- �� `� � .� o --, � f-. r� �' �-�" F-. a-, � '-� �-�.t � � a"i � ,� 1J .��' c��j 7?C viW �� � U � � O� ��--ry U ? � � S Q � "' Q� �� a.�, p ..'7� � � � � '�.a O � p W i-.Z w O ,Z i' � ._....---- --- , a CL,AYFY SA�1D;vesy dark grapisl�b€owci,di}' CEi �-� _._____- -_--__ -� �u�� A 2ft.7 107 79.6 3I -2 stii'f �f� . . . Sp�l� 6 9 ��__�. -3 �� C]I SANT�1'CLAY:dark Uruwci,dry �-'_ 4 . . . . - \ S . CA 8 $ U O sti ff \ 6 . . \ -7 � \ g . . s[iff\ 5PT 9 9 y . . . \ -lU-- -ll -t2 -i3_ -l�l— IS -I6- -17 -18 -19 1713 -2Q - — ---_ _ _ - --__----..._....- ----..,..-- - ----- --._._ � � � ��� � � � � �� �.-� � �' BOR�NG No. ��� ��>��� �i� 220 I3igh Su�eet, SaYi Lu€s Obis��o, CA 93�Oi N 1421 West'i'a�n�La��e, Sliitc 105 JOB NO. �11Qg�3�_� Sant�Maria, Cf193454 PR01�CT.INFa1tI1�ATION DRZLLING INTORMATION PROJ�C'T'; k�'faclo►ina -�'roo�n R�nch Dl�i'L,I,1�IC: 11�Iobile B-24 DRILLING LOCf�TTON:See l+igure 2,S'rte Pla�� HOLE DIAIvI�TER: 6 Id�c:l�es DATE DRiLLFT): lY1ay [9,201f SAMPT�ING M�"iHOD; ��'T LOGGED BY: GTV I��IOLE ELEVATION: Nok Iteco��ded � Deptfl of Groundwate��: 4.0�'eef T3oring Terminated At:4G.0 �+'ect Page 2 of 5 � � � �" x �, 4 W � � ti �` ..��. � � � �d u q g Z 4 ti �j 50II,DESCRiPTION � �r ^ � 0 � � � � �� ,F-. � � ra `-� � � � v �, � w �` r� 2�t �u.�� ¢"'' �' v fx � O �� U � � Q�, � � w ,�!� �� � A � -�"] �n � � �' U � U p W � �``V � 0 ---�----___ __...__ �.— -- --- CLAYEY SAAl�:vc�y dar!<grnyisl�bro�viz,dry GI-1 . . . . � �� .\—\ -2— Cl�l SANI]'Y CC.AY:tlarlt brow�i,drY _� \` _q firm � � � � SPT 5 7 �__ 5 . . . � 'b � CH St1NDY CLAY:dark oli�e bro�vn,�ery moist "; , -7- \ $ . . . stiFF �� SPT 8 8 -9 . �f -�d� CH — 3/�N3]1 CLAY:bl�cl:,very moist ' ' ' -li � -12 J \ -13 \_ _�� stifF � SY1' 16 15 � 15 \— -1G CH - SANDY CLAY:darl<oiive Uro�vu,���iil�gr�avel, \ -17- coarse grained . ��s sr��e \ �_ SP'1' S �1 -19 -20 �-- -21 —� ' ' � 1714 -22 .\ _L3 �� � � � �1�� �e�� . __�' 1 9 0 �:� �� 220 High Street, San Lt.�is 0[�ispo, CA 93401 BORING NO (coz�t).��� 1021 West T'ama La€le, Suite 105 J�B �N� ��,0�,7�4�� Sa.tlta 7��faraa, CA 9345�} � Depth of Gi'oundi�szater: 4,U I'eet Boz�ing Tez•minated At: 46.0 l<'eet Page 3 of 5 w " � `� o � ti � � � � z � �� � � � � � � � � � � 2 0 � `" �' �w � �� p so��.nrscruPT�ou � o � � -� o � � � �� � `' ° � �. � � � � � U � � �`w �� uz`u � �,w , � w� �tiA � o� �� � � � � �� 24 . . �.\_ -25 4 C]I — SANDY CLAY:c(arl:}'cllowisl�browu,slturt�tad _26 -\— Z,� very stiff _\� _Zg \ —\- � • - - SPT 2l 1G -29 \ \— 30 \ . . —\ -3� -` _. _32 -33-- \ _ -34 \ - -35 \ -3 6 \— -37--- �_. -3 8 \ �\� 39 . . . . -�— -40 . _\_ -a r � _ � ��_. -az . . . _�3 �-\ -4�1 � -45 �ery sticky ` _ -�IG 1'12A?�ICISCAT�C(JndPLE�:serpentinite& - melange,meta voIc�anic,very weltl�eted Sl'T 50/1" -�17-- ___ ---- -4 8 1714 -49 50 _....._._ ____�_— -- < eo olut�ons o I�� �o� � .. _�: , . 220 ITigh Stt'eet, San Luis Obispo, CA 43401 BORrNG No ��ont�.��2 i 021 West Taina La��e, Suite 105 Jp$NO, ��,09734�°1 Sa�ita Maria, C�l 43454 � Depth of G3•oundwater: 4.a Feet Baring Terminated AC: 46.0 Feet Page 3 of 5 z � � d 4 ° � � r� � w `" ,'� �' � ^ �" U � �' � Gv U �O a � `o ,'Z p,� � `' ,�' �" aQ, W �` r" �.^. p SOIL DESCRIPT[OI�F � o � � -. O � � � � ,�F..'�`, .0 `" v ,��j � � �y � � F. � u� � W r y �'ix�j �r; FL SC �. U aL�i �' �' f" .��Z � � ''� W� on � O O W �Z ry t-� k � U � Q � _\ 24 . . \ _25 CH _ SANllY CLAY:dark yello���ish�iro�vn,safurated ' ' ' ' -26 � very stiff _Z� \, -2F �� - � 5P'C' 21 36 -29 �� -30 � � - �— -31 � � � -32 . . -33 \ -34 \ -35 \ -3G � -37- � -3 8 \_ -39 . . . �� -40 . . �— _41 . . � -42 , . . _�j � -44 \ _�5 ve;y sticky \ .�� FRANCSSCAN COMPL�X:serpen€i��ite& � melange,meta vnlcanic,very�veathered S?T 50/1' -47 -48 _�}g 17142 -50 � � �� ��� � �� �' � '��; 22 ' - ' BORING NO. ��3 i� 0 H��1� St��cet, San Isu�s Obis��o, CA 93401 ]02� West Tama Lane, Saite 1D5 ro�No. 5�,09734�1 S�7.nta IV1ai•ia, CA 93��54 PROJECT INPO.RM�I,TION DRILLING INFORMA"1,ION PR07F�CT: Madoi�na -I+�•oo�rz R��ch DRILL RIG: Mobile 8-24 DRi1,L1NG LOCATTON:See I'igu��e 2,Site Piat� HOL�DIAM�T�R: 6 Inciies DtIT�DRILLED: Ma�� �8,201G SAMPLING ME'I'FIOD: �P'I'and CA S�OGGED BY: GTV T-101,E�LEVATION; lYo�Reco�•ded � Depth of Groui�ch�atea': 1.5 Feet Boru7g Ter�ni�lated A1:10.0 T+eet Page 4 of 5 � � y � '� .L�• .�: � o �" V ,"�� o Q � i \ �-�. � SOIL D�SCRIf'TIQN C7 � �' 7 Z s �, .� ,y, o .: �- U � R � W � � O � O � Z � � ?� ,Z F: a�, o �-, "' � �-`". � � W .: � �� c�w � a N � `r � w � ° � c°� � `� w� �° � � w `= � �u a_ —_—___--�-- --- _. _--_--- PAT CLAY:very dark grayish l�rown,dry Gf� i B l8G 94.7 48 2 finn SPT q G -3 CII SA?�IDY CLAI;dark afive bro�vn,vei}'moisf ' ' ' ' _4 \ -- _5 Pirn� �— � � - cn � � _� � �— -7 . . . soft �� -8 . . �-�— SPT 2 2 -9 � -ID— -t 1 -_� _12� -13— -14- -�5— -i6— -l7 ��8_� 1714 -19 �n .-"_' --------- ...-..---- ----_ .. _.._— - -----__ ._.._....... i i � �O��li��1�IlS Il . O II�TG LOG ��� � ' BORING NO. $-4 220 t-Iigh Sireet, San Luis Obispo, CA 9340] 1021 West Tama La�le, Suite 105 �OB NO. �L09734-1 - Santa MarEa, CA 93�5� ' � PRO.IECT 1NFORM�.TION DRILLING INFORMA`I'ION PROJCCT: Madonna - Froom Rancli 1�R1�,L RyG; Mobile 13-2A f DRtLL[NG LOCATION:Sec Figure 2,Site Plan HOLE DIAME"1"ER: 6 Inches DATE DRTI,LED: May 18,2016 SAMPLTNG METHOD: CA aud SPT LOGGED �3Y: GTV HOLE ELEVATION: Nof Recorded � Depth of Groundwater; 2.5 Fcet Boring TerEninated F1t;10.0 Teet Page 5 of S a � � � .� F� � L` �' q � Sr W 501L DESCRiPT10N � � ^ � Z � � � y �� � U �, � p '� ��'' � i � ,� W � �! z 54 h W � � � �, � � �" � � � � � �, w Q Q �,z .�' '�` � � � � � � o `� � �a ��Z �o � � i; p _�— _ � �. -- ` - - - i; CLAYEY SAND:very dark bro�vn,very moist CH - . .: _� �� ;: soft �� _2 �� -3 �� -d �� _�� -5 CH CA 3 3 SANbY CLAY:dark 6ro�vn,very moist � 6 ` _ �\ -7 `. . �\� _g . . , _9 �rm -�1 S P"I' 6 6 � -]0 -il -!2 -l3 -l4 -l5 -16 -l7 -lR -19— -20 �eoSolt�tiops,Inc. ' SO�X,S R�POR,T (805�5�43'�8539 :' ,, ,.,. _ P��o'ect: Madonna Fcoam Ranch Bate'T'es#ed: .Tune 3,2016 Clienc: Project#: SL09734-1 Sam le: A De th: ]AFoot Lab#; I651G Location: Ci-[ Sam le Date: Ma 18,201b �arnpled By: GVI'['G Soil Classification Labaratat'y:;Maxi;num Datisity A5'CM D2487,D2488 ASTM I71557 Result 'Ve�y Dark G�'�yish Brown Sandy I'at CLAY y�. Specificatio�i: CH Sic�e An:�lysis �� _ __ _ ---- AST�v1 D�122 5ieve Peecent Project u �$; Sizc T'assin S ecifications fl- � ` ' 3" '�, � 0.6. 2�� a�i � o. 1 3/2" i� p� - �„ 3/�" 0,2 _� �._.:— .. —- - -- — - No. 4 93 No.8 9� No, 16 89 �� 0.0 ` 0.2 O.A 0.6 >0,8 1.0 7..2 `: No.30 87 No.50 84 lNater Cantent,%; No. 100 82 , No.200 79.6 Sani1:� uivalent Ca.1217 l . `: SL� � IViold� n/a .' 'Mold Dia�neter,ins.': 4:�a 3 `No,of La ers. .': ` 5 ` We€ ht of Rammer,lbs. 10'QO q ' ': " No.'o��lows ;`:.. 25 : ` Plasticity Index ASTM D�#318 Li uic�Lim€t: S4 Estim;ated S ecificG�avi for F4�%'Satui�ation:Cu�ve= Plastic Limit; 23 `I'�•ial#" 1 2 ''. 3; ;4 T'lasticity[ndex; 31 Wafer Content:;:: Expnnsion I��dex Di .]7ensi : ASTM D4829 Maximum Dfy'Aerasity,pcf; �.xpansion Index; 107 Opt�nutn Water Coi�tent,% Expansion I'ofentiaL• I-Tigh Ia�itial Saturatian,%: 50 Moistw•e-Densi AST�v1 D2937,Maisture Content ASTM D2216 Sam le De th{ft Water Content(%} D �Densi ( c Rclative I]ensi Sacn le I�escri tion B-1 2.5 3g,5 Da��k Olive G3•a Sand CLAY E3_2 2.g 2�,4 Dark Olive Gra Sand CI,AY ; ! i i ;; Re�o�rt Sy: Aaron EichEnan % B1 °" 17145 +F� i 'GeoSo.lutio�ns;�nc. SOILS REPORT {$05)543-8539 : - , Prpject: Madonna Fraom Ra��ch Date Tasted: ,1une 8,2Q16 C�i���, Project#: SL09734-1 Sam le: B De th: 1.Q F�oat L�b#: 16516 Location: B-3 Sam !e Date: Ma IS,20I6 Sa�npled I3y: GVCI'G Sozl Classification Laboratozy:Maximum Density ASTM D2487,�]2�88 ASTMD1557 Restilt: Dark Gray Fat CLAI' II 1,2 ;E ---�-_ �---� i , -; - - -- , Specifica#ion: CI� � � � � : ; ; , � 5ievc A�nal��sis �. ` 1.0 � � . _, _ _1 _ . _� , � € ASTIvI D422 � L E ; , � i Sieve Percent Project � 3 : � ' � � a 0.8 i - . � � I I ! I Size Passin S ecificat'sons , i 1� 3" � ' - � -- -- ` 'N O.fi - - 3 - i-- i 2„ a j ; . .� � , � � 1 112" � d4 � - � - � - � - � i 1" I ° � � � 1J i `.i i I ;' � I 314" !� �� ` i - � ( ' `I - - -� 39 02 - , I No.�l 100 ; � � ! I . i I - � Na.8 100 0.0 �� _-��_� � '�-_E--- - _;��� - Na. l 6 T 00 I 0.4 ` 0.2 0 4 '� 0.6 0.8 1.0 12 No.30 94 <`-� � � l�o.SE} 9$ � �lhlater Content,%��.' i I '� No. 100 96 j ' 3�To 200 94.7 � i , ;:Sand� uiva�ent Ca1217 ' � _ _��__. _ � i 1 S�; ; ; � Mo1d;ID ` n/a 1v1o1d Diarrieter,ins. `. 4.00 ;? ;; ...3... ;` ' No.of:I�a e�s ' S Wei lit of Razn.mez;',lbs "I0:00 ; �} '. Na..bf Blaws , 25 P�asticity Tndcx �� ASTM D4318 � E Li uid Limit: 84 L'stiuiated:S ecific'Gravi far'100°/Q Saturation Curve- ',[ Plastic Lin�it: 36 Triai# ' l 2 ' 3' 4 ',� Piasticity Index; 48 WaterContent:-: Expansion Tndez D Densi ; , , , : ; ASTM D4824 Ma�ciinum Dry::Density;.pcf; Expansion index: 18G �ptrmum Water Content,% - Expansion Patential: Vez•y kIigh � initial Saturation,%; 50 ' Moisture-�ensi ASTM D2937;Moisture CanEeMt ASTM D2216 Sam le : `De th(� Water Gontent % 7Jr Densi { c Relative Densi ; Sam Ie Descri tion " . . ' . .; ,. ,. _ � Re ort B : Aaz•on Eichman �� 17146 i E . . . . . . . .. . .. . . .. ......�......�.. �.. . . ...... } Geo�alutians,Inc SOILS REPORT (80S}543-8539 ,, Proiect: Madozana Froom Ranch Date Tesled: 7une 9,2036 Client: Pro'ect#: 5L09734-1 5am ]e: C De th: 2.0 Peet Lab#: 16516 Location; T-2 Sam 1e l�ate: Ma I8,2016 Sainpled By: GVITG SaiE Classificatio�i Laboratory;Maximuin De►�sity ASTM D24$7,172�88 ASTM D1557 Resuit: Dark Reddish Brown Sandy I'at CLA'Y i; 1 2 -, - .-`- € ----- � -- ----�---- I_ Specif cation: CH � � { ! I , 'Sieve Analysis 1.0 � ---- . , ._..---- ___ �__ _ _� asTM D422 ;L € I i - _.... � , 5ieve. Percent . : ' Project ': u 0.8 I i � , _- � - - ' _-- _ ._.,,_ _. .. _ a �. � i � �, `�ize ' Passin S eei�ications j ' ��, _ ;_ k « ' ` 1 ; 2�� '� 0 6 � � __.. �..� ---- � i o � � � ; _� I �'2,� o o.a � -_-J -- '__. . . __..- -;-- --- � -___ _.l , t . . . . . . F � '. f . �i . i. 3!4" . 0.2 .' ` � i I _ � __ — ----- --- �To,4 ` ,. I . E -., � ..� �� � N0.$ �.� _I...�_._.._ f __- �__,� .-�.� ._�.�._ - - J�� IVo 16. 0.0 0.2 1 0.4 . 0.6 �0.8 ^ 1.0 LL .:. .1.2 No.30 ' No.50 _, I ' Water Content,% 'Nn. I00 " No.200. ; " Sand:�: uivalent CaU217 > ` : `: : 1 SE: '' 2 ':: Mo1d ID "n/a Mold IJiameter,ins. 4.00 3 `No.of.La ers 5 Wei ht of Raix�ziier,lbs; ':7 0:00 ` 4 _1:No.'.o£'Btows _ 25 Pfasticity Index ASTM D�43i8 Li uid Limit: 65 Estimated S ecifc(`rravi :faz•109°/u Satui�ation Curve- Plastic Limit: 23 'I`taal# 'r 1 2 3 5' 4: Plasticity Index: 42 Water;Content; ;': �spansion Tnclex D Densi . A�TM D4829 Maximuin➢ry::Densiiy,pcf �xpansion Index; 79 Optimum Water.Content,';%: �.xpansian Potential: Medium Initial Saturatian,%: 50 - :Moisture-Densi ASTM D2937,Mois#u�•e Content ASTM D2216 " Sam le` '`De th(ft) Watei•Content(%) Dr Densi ( cfl Reiative Densii 5am le Descri tian Re art 13y: Aa��on�ichn�an B 3 17147 l COIY�O��DATiON REP�R']C 805 543W8539 GeoSola�ions,Inc ' ( ) _ __ D2435 11 _ � Pro'ect: Madonna I'room Ranch Date Tested: 6/7/2016 r C�ieElt: Pro�ect#: SL09734-1 5am le: B-1 5' De th: 5.0 Feet La�t�: 16516 Location: B�1 Sam le Date: 5/18/2016 Material: Very Da��k C;rayish B3'own Sandy CLAY Sampled By: GV/TG 0.00 E 2.00 - 4.00 6.00 ; ,3 •� g.�� _ � �, ;3 � if � 10.00 � : l J 3 � 12.00 � 14.QQ � � � 1b.00 _ � 18.00 ' � 20.OQ 1 1Q 100 10QQ tooaa Log of Pressuz•e App[ied Pa•essure(ps� %Strain Compc•ession Index, Cc 250 038 0.1b5 500 2.99 Recompression Index,Cr I000 b,55 0.017 2000 I0.]2 4000 t4.]1 8000 1835 2000 17.32 500 15.56 Report By: Aaran Eicl�man I3 � 17148 ; � ` DIRECT SHEAR TEST GeoSolutions,Inc. ; (SOS}S4 ,, SIIMMARY REPORT(ASTM D3QSfl) 3=8539 Projcct: Madom�a Proom Rancli Project No.: SL09734-I Client: Date Tester�: 6l9/2016 5ample No.: B-1 @ 5' Deptli: 5.{1 Feet Lai�No.: 1 GS l6 Location: B-I Checked I3y: AE MAT�,CtIAL DESCRIPTIOA! LL PL pI °�P Passing Gs* Sample Type No.200 Very Dark Graqish T3ro�vn Sandy CLAY ��m mn mm �m 2.h irnsitu(rings) *Gs=�sscnned;um-�not cneasured p�-��� Q= 1 ksf � � Q'2ksf ���m 6-3ksf """'"- 6- � ksf-�-�- Q=2ksf� a=3ksf--• Q=�}ksf -• • Q=4 4�sf o Peak � Ultimate p ppp 2.5 , .�'••l. U 0.005 �� � u�i 2A -- r � `,�� V �, m .� a� �.�.._..._--- � 0.0�0 I�``yqs ... �.5 /' a �4� ai � �� " �--emae � �.a /, ��.. 0.0�5 .� �� � - . f�-- ., PO,., e_e m_e,�_ � ~� � 0.5 -��'�� �- � OA20 '.� ��`r , � 0.0 `� 0.025 � a.ao O.ia fl-2a 0.00 0.65 0.40 0.15 0.20 Horizontal Disp[acement(in) Horizontai Displacement(in) 4,6 � initiai Specicnen No, o Peak Conditions 1 2 3 4 3�5 o U�tima�e Dry Density 92.3 403 37.4 95.7 � 3.0 -Linear(Peak) �_ Water Content(%) 25.8 25.8 25.8 25.8 � Dia:neter(iu) 2.42 2,42 2,q2 2.42 � 2.5 Sample Height(in) 1.00 I.00 I.00 1.00 � m � 2-0 Specimen No. � Test Data � Z 3 4 � �.5 _�_____ _....�_._ -- cn Nomaal Stress(ksf} 1.00 2.OD 3.00 �}.00 ��� -� Peak Shear Stress(kst) 0.72 1.06 1.85 2.28 Q 5 __ Horiz.Displacenent nt q,15 d24 024 0.24 Peak Shear(in) �•� Ulti�nate Shear Stress{Ics� O.GS 1.06 1.85 228 0.0 1.0 2.0 3.0 4.0 Normal Stress(ks� Horiz.Displ.at Ult.Shear Q 24 0,24 0.2a 0.24 (in) Angle oflntema!Triction,�Peak(degrees): Zg.� Rate of Deformation 0.002 O.Q02 0.002 0.002 Cohesion,Cadz�Psfl lI0 (snhnin) Remarks: San�ples were uotsaturated priorto shearing SS 17149 �, . ���. 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':� i ti / � � ��f! ,f decply4oiifl����Y�realheieddepend%nponF�anc�sc�niockSype;daslsatnangular, ' � �_�4� �'� - > ����;� tL �j`r � � � ��`l� ��� �� hlphlyGacWreJ;vrhewhuclurediocknypcmvmveaEl�ereJ;mnlsl,roheslvo,afiphtly Y` h r � 1 � '�✓ _:.A� ���� � �� � Sougir,sLphllyha�d:�•�eakmcd��msu6�anpula�6lcekysErueluoailtrou9houS,vory�rcaFly � - , . �� � { �� � � � � ! .,i S �,,� . � 1 eMqessodBi,ycldaydevelapmcrdisexlenstve,n�ayreqeclpos{dcyas'Ifanalmavemenl ti ��r�.i' �� � � �f � �� � y��� ��1 rCry� ofunil;6as�Sconlncl{sb�+iled,�ves2e�nconlaclismodn�nteyries4dp�inpf*uft. t {'7 Colkrvlalwcd rn�lmial. � ir ��a��iL ' s 4 � }.�� �'��i� �f Lr�s�1 i �Q �y i �s?�I� ��' �„� �i Lki � �� � 41r ��y�,� # �' �EKf�r �� z e, �� S � � -�" � � .ri ti �`` Sr . y��r- � ���, �� -I � p�' �� � �� �� 1� x�( Fmndscannrefanpeandseipentlnlle(Cre[accouslJur�ssic} t✓;� ��' k� � � `..' �:� ��, '� r f� � �' ,�s�� "f�`•~ � � `; r1 �k i �a3.r f.'f ''' � ? ��'� r{`, � �F�ppp,�..�`� �--'a}� - t r ( �-r� .,i�s �''.aC � �l �� d ,�. ,.,f,�, � . � / . 7'- ' �l '_� � '�'� ��� � � 1 t ,4�o t F�?.a� ti'�j�G��c t����, 3 Conlael y ' �'/ '. a� .z - . :�� t�-� fti'� � -�, '� ..� '�� 't '�" — — -7 Dasfiedivhereapproximata; V' r' 7' 4- .r .-.r,•. nzs '� i _� f y, � �y��!i�' ,��1?�� ,, `' �- � .i� . .1 �r` . . y;i � � r 1��� {y���r.l` '� 4uaned�vhorouncertarn � � ,{Jy �, _ �} r� A, d¢�3�. � �.?i ' .,E� i���1 - �'rt i_j� i!-`;1 � � �i�+ ;'� "s 1��� ' � �<— ��; ��r, ^ �,aioa �. ��.���� � .. i ,��' �fi�`s�F rj �.}�,: 9 deddln i � � � �� �� 6 �._i�' vi•" � .. � - �l - �^: ���i 5,,. '& � -r /4 � ._._._7 Oashed�rhereappvrimale; � ' 411���yi�� � �. �.j-.,�...e„_ � � '{.. �,�i r'-J ����'�i�r � �' :�J. '�'..,��(�{' �0 4uonedivhereuntarlairt �' � r .q' . . - a'r �-, S4�`�►�,t.' ,5,, +,,� f� ac�J_ w'!r "RK p J ,.�''.�✓l+' ' ' r� �.;;w;r.• d "1�k. :�n 4�''`;?'�� . F�.""`� #�;: :��-1 ;�f� r � 1�, ,.�'. i�,�j'r�'s$�, �5 � `g= wy�:ry� 4t�.��y ��.- _ �`�¢,� - �r^•.., t � y ._.. TrencfibeseaRdcarncrs a ` �r �� '�� �r����� Faull(Aciiva) 9 � � y� - :�� � �310 .�- "'"'" * �arhed whero approximafa; — w E,.Y= - _ v . �� 4 ✓ 'r� Y .��«"�.� ' F f �� �� }.� 4�enedivhoreurtce�tein � � .l. �. � �K �� ,� '�r ��� `l � i A �� ' • g , � -a, riiu ti•+ FaullAlliludo � . � �( ' � �e.s•st•+ � �v ' s,� �� ,zo� ,,.�'� - -i � � . � '� . ; � ` 4 � _�� i � ���� �S�osE FolfnllonAllilude �]jj��� C y �t: E��� �(�l•� 1� /j• � ,' { i! e r � I'=0.5m .. - •�:.f�.. � NO YPIQGd�BJt�a(19Ne0p� �- }��` ,I`'���" 9 � Noie:HorizanlniandvcNcafcalorYailetion9onlopduelo6nckpmundyholnmasaEo Phvto log of Trench T-2A South Wall � _ I—�_ 5 a 3 z � o pGB�Los Osos Faukt Trench Evaluatimi a lioriaonlal�istnnce{melne� [;C�Le111sCans�rllanl=Inlematlanal,lne. Piale 2 � 17152 � November �S, 20'I G ECI Projeci No. 3f�13 °'��� _ �'� Earth *r`�' COf15l�It1C]�S International To; f'acific Gas & Electi�ic Company Geosciences De�a�rtment 2�#5 Marl<et Street, MC N�C San Fr�ncisco, California 941D5 Aftentio�z: Dr. C��ris Matlugo, Senior Gealogist Suk�ject: Repot�k - 5oil Stratigr'aphic Assessments ii� 5upport of a 5tudy to Characterize tf3e Acfivify of 5trands of tfie Los Osas Fa�ilt Exposed in Trencftes Along the Los Osos Valley [ioad, in San Luis Obispa, California 1.0 I NTR�DUCTION We are ��leasetl to �resent this re��ort describing o�u� fincii�gs of � soil stratigra��hic s��dy that vve conc4ucted at yo�ir request far a site along L.os Osas Valley Roacl, in S�n Luis Obispo, Cdll{DI'llic�. Tl�e purpose of Qur stuc�y was to estima�e the age of tl�e soils o[�sc�rvecl in trenches excavated by otl�ers. Thcse trencl�es ex��osec4 sti'ancls of the l.os Osos fau�t, �nc! we were as!<ed to provide assistlnce in cl��rac[erizing the age of the sails involvecl in the faulting ta L�etter undersfancf lhe recency of aclivity af the faults exposec3, and if possible, their earthqualce recurrence, De�ea'min�tio�i of the age of the faults expnsec4 will be concl��ctPd by others using our soils data anci observations regarcling I�ow the Faults interzct with uarFo�is surfacc �nd b�triec! soils lfiZt we idenNfiecl in two trenches. 1.1 SCOPE OF W4Ct1C 7he sp�ci(ic tasl<s tliat we CO1lCILICtCCI as part of tl�is study are describecl iaelow, More detailecl information regai-ding the methodology we usecl to describe the soiis, calculate tl�e soil inclices, ancl estimate the ages of the soils is �7ravidecl in the followii�g sections. . We reviewed photos and ��hatamosaics of the trench exposures �r�t! ciiscussecl our preliminary impressions witl� ya�E ancl tl�e project tear� via telef�hane anc4 vicleo cor7ferencing. • We r_nir�pilecl, revic-wecl and analyzecl sev��•ai soil cliE-o�7osec�uences ancl soil profiies cle�efoE�ed in coastal areas af centj�al and sauthern Califor�ia anci the Baja Peninsula, M�xico, tl�at were dcscribed �nd cl�tecl by others. 1E sail clesca�iptions were provicled in tl�e so�irc�s used, we calcul�lecf tl�eir Soil Develo���nent Indices (SDI} ai�c4 Me�n Horizon Indices (MI-II} in an effart to cEe�elop soi� chronofunctions appropriate for the 5an Luis Qbispo location, 7he references usec4 arc listed in Appendix A, • 1Ne tr�veied to/frorn the Los Osos Valley trenching site in Sai1 L�iis O�isE�o, wl��re we 'I review�d lt�e trench exposur-es still open, discussed with you the stratigraphy abserved Gifi42 1=. 1=aurth 5treef (�, Sanki nna � California (� 92701 �s�' USA � lele��hoi7es; 714-412-26��4 � 544-5321 [�j Facsiinile: 71�4-494-�930 -"� tivw�v.eartf�cons�cltanis.com 17153 i � � i I � Novemf�er 1 B,201 G � ECI Pt'oject No. 3613 in the tres�chcs, as��l photograE�hed �incl �alfectec[ soil sa�n��les from fotir se��at'at� sail profiles, We also collectecl sampfcs of �tnaltere�l or slightly allerecl al�uvium �ro�n the . � o' s r ert to use as roxies for the s tl w�lls of thc acttve wash near the east s€�ie of ihe p op y p parent mateE•ials. • Bacic in our office, we comp€e�ec] the soil ��rofile descriptions, These are ��rese�itccl in AF���enclix B, � Wc calculatecl the SD1s and MHIs for tlie profiles tf7at we clescribed in the #ield �ncl com�3a�'ed them to the inclices of the soils descr'ibed anc! dated l�y others lhat we hat! analyzec! ancl compilec� as ��art of our ciesf<to�� st�Edy. Using the chronofunctions cle�elo�ed fro�n the soils clata analyTed, w� �stin�atec� a range of ages for the soils at fihe site, The soil age estimates compu�ed were then �etted for reasonableness based on to��ographic and geomorphic�osition, and geologica! context. � W� pre��ared th,is �-e�ort summarizing [he worl<completed. 2,0 M��1�HODOLOGY US�D FOR SO�L�STC�ArIGRAPHIC ANALY5�5 ',I � 2.1 BACKGROUND '� � The tes�m soil as used hercin refers to a natu��a� body oF ���ineral ancl/or organic ma[eria] '� = cot�sisting of layers (or horizons) lhat are clifferent from the uE�derlying ot� ariginal geofogic (parent} material in t��ei�' "mo�•phoiogir.al, ��hysical, chemicaf anc[ mineralogica! ��rope��ties and their biologicaf characteristics" (Birf<elaiuf, 1984J. 7fiese cliffei�ences are lhe result of i weathering anc! the effecis of fi�e €nain sai[-forming factors; parent material, climate, slo�e or topography, organisms, �nc! time �)enny, `[941). Time is a�� important factor beca��se �he ; longer a geologic tle��osit is exposed to the e(fects of weathering and soil formation, the P better devefo��ed the soil characteristics generally becom�. We tal<e advantage of this � when ��sing soifs to estimate the age of the de�osits. � ; Soi[ cleve[o�»nent occurs on stab9e geomor�hic surfaces (a sta�ie s�trface is one that is not ' ��eing significantly iin�actecl by deposition or e�•osion). Soil de�elopmenl ty��ically s#arts to - occur as soon as a surface sto��s being erodecl or deposited on. 71�erefor'e, in some � envir'onments, such as an allu�ial plain or allu�iaf fan, it is common to find se�e�'al weakay � to moclerateiy de�elopec! buriec{ soils that rest on� upon tf�e other, some�imes sepa��atec! lay � �naltered or only slightly altered secfiments {the �aren[ material). �he soils represent � periods of sub-aerial weathet-ing anc� soil formation that occurr-ed En between perio�ls of E alluvial erosion anc�de��osition, E ' ]n these environmcnts, the age of the primary, unaltered cleposits is estimatec� by summing � the agc of tk�e incfividual soiis, is�cluc�ing the surface soil an�l tf�e b��ried soils tl�at overiic F' the section oF interest. It is im�ortant to recognize, however, that thc soil�age estima�es wil[ � �ro�icle a minimum age for the parent mate€'ial, as the estimated ages do not acco��nt fo�� E tl�e le��gth of time it [oolc for ehe sediirre��ts to lac de��ositecl, Fu;�lhermorc, if poriions of soil � horizons, or e�en entire soi� horizons, have been c'emav�d {t►•uncated) fron� the area L�y : erosion, the age estimates will not ca€�t��re fhat erosional pe�'iod of time. Ne�erthcless, if these limitations aee recognizecf, soils can pro�icle usefu� informat�an on the age and � geologica! histoty of a constE�uctional s�lrf�ce, sucli as Zn a![uvial or marine te��race or ` a�luvia[ €an, �f��is is especially true fo3� sedirnents that 1) do not contain suitable data�le � materials s�ch charcoal, 2) whose age extends beyond Ehe ��se(��I range of racfioc�r�on � 12eport—5oil 5f��atigrapliic St�dy 'sn 5u�port of 1=ault fnvestigat�o�� E'age 2 i 5an Luis D�ispo, Ca�ifornia 's � 17154 ', f , € i ' , Novembe�' 1 a, 207 6 ECI Project No. 3673 clating, 3) [h�t are too coarse-gr�inecl or too c�ayey lo clate using Optically Stimuiat�c! L�mziE�escei7ce, �ncl 4� cannot Ue c�ated by soine o�hei' absol��te ciati�ig methatl. In these cases, soil-age estimations are partir.�Elarly useF��l, 2.2 SOIL D�SC[t1PTIONS For this project we described fo�iE- soil ��rofiles; lhree in trench T-1 A and one in ir.ench T- 2A, �hree of these ��rofiles incl���le a s�irf�ce soil and two �mder-lying b�n'ietl sails. The last ��rofile we descril�ecl is a sni4 cleveloped in a fining-upwa�•r.l sectioi� of fii�e-graEnecl secliments thak were cle��osited in a low spot that ap��ears ta have for-med as � result of movement on tl7e =1�ljacei�t fault. These sediments are referred lo here �es "pondecf cleposits," Lastly, we �Iso callected and described sa��ples of unweather-ed ta slighily weat>>ereci alluviun� f�•oi77 �he active channel near tl�e eastern ��artion of [he sile, Tliese allu�ial de��osifs are r�oi�siderecl represei�►tati�e o� ttie F�arent ma�erials for the soils clescrif�ecl in the trenches, The desc�'iptions were madc using a com�ination of the cf�araclerislics ancl nom�nclature estal�lishec! l�y the Soil SuE�vey S#aff (T�75, 1992), the Natioiial Soil S�n-vey Center (2012), and Bit�keland (19�34, 'i9��J). Color's of the soi! horizor�s were recorclPd �y cornparing the color of the ri�atrix ar�cl clay films, l�oth in the rJry ancl wet states, to color chips in a I M�msell Soil Color C�art, IOther characteristic,s tliat we reco��ded inc..lude: 1) texture or grain-size clistri�ution, 2) strtict�n'e (whether the soil mass l�r�a!<s into clistinct�ve peds, or is single-grained), 3) ihe ai7iount, clistribEitian antl thic!<ness af kraitislacated clay Forming fil��s or stai�is on the soil �ed faces and clasts, in pores, between sand graiizs (callec! bridges}, around clasts, and in clast pocl<ets, 4) ihe looseness or incluratian of the soiE pecls when dry and moist, an�! 5) i thc sticl<iness �nd E�las#icity nf tf�e we# soil. The sh��rpness and reEief characteristics of the 1 contacf(or bo�mdary} between horizons were a15o t�otecl, I� l=inally, we also noted antl qualita�ively clescribec� tk�e content, size, ang�ilarily oi' roundness, preclominant cot�i(�osition �nd c�egr�e of weathe�'ing of the clasis founc! mixe�i with tl�c finci'-grainec! soif rriatrix. The clast wealhering s�ages ��secl follow the � no�iienclatu�'e defined by Tinsley and others (1982)', who fo�md a posit�ve correlation � between the age of a cle�osit ai�d tlze c�egree of weathering of the clasts therein. The complete soil c�e�cri�tions for al� profiles are proviclec� in Appenclix L3. 2.3 SOIL INDICES AND UEVEl.OPM�NT COMPARISONS ; To estimate the age of gealogic deposits using soii-stratigr-aphic techniq�ies we rely on a comr�arison of tlie cl�aracteristics of the soils in c�uestion with those of othe�� soils �' � Sta e 1: Uizweathered hedrocl<, rings sl�arply to blow of hainmer, Stage 2: Sligi�tfy we�ttherecl bedracl<, incipient to moclerate surface ��ittiiig, fr�cturecl, with i oxiclation rinds gre�ter thai} 1-2 mm in thicl<ness, yie�ds moderate ring ta blow of hamiiier. Stage 3;Substantially weatherecl I�eclrocl<, sur{ace highly pittecl, strongly fraclured, inafic miner�ls a�id felclspars may be strongly aitet'etl, clasts c�n E�e bro]<en with diffic�alty by hancl, cEull sound to blow of hamn�er. Sta�e 4: Very strongly weaihcred bedrocic, easily disaggr��ated f�y hand into gr�is; very dull sound when strud< widi hamnZer. M Repnrt-5oil 5tratignpl�ic Sludy in Supportof Faull lnvestigation f'a�e 3 San Luis O�ispo, CaliFornia 17155 � 1 i � F k � �la�en�ber 18, 20�1 G ;, EC] Pr-oject f�o.3G13 � cleveloE�ecl in similaE• �a��ent matc�-ials and clirr�ate conditions that have bee�i clated using both absoliite and relative dating methocls. For this q�iantita�ive com��arison, thc cliaracteristics of the soiis are assi�ned ntimeric�l values that are tf�en �rsed to calculate the � soils' clegree of �I�velopment. We ��secl two of tl7ese qi.�antifative methocls For �his st�.�cfy: � Harclen`s (19�32) Soi] Developrr�ent Index (5D!), ancl Ponti's (19a5) Maximui�n Hoeizon ° [ndex (M1-I[). Both SDI anc! MHI valu�s ha�e I�een shown to be usefu] ��elafive inclic�to�'s of � soil age, with oEcler, i�etter devefoped soils ty��ically having higher SD� ��nd MHI ��lues � (Harclen, T9�2; Harden an[I Taylor, 19�3; Roc�<wcll et al,, 798�; Rocicwell et al,, 1990; Bornyasz anc� Rocl<well, 1997}, fn these quantitative asscssments, tl�e charactet'istics of the soil are "subtracted" frorn �he � cha�'acteristics of the parent materia] to develop an err�pirica� estimate of the fenglh of tiirre that a geologic deposit has L�cen sL��jecfed to the effects of weathering and soil forrr�atic�n, field studies have shown [hat al[ n�her conditions i�eing equal, a soil clevelo�ed in fine- gr�ined secliments a�}pears l�etter �levelo�ec�, witEz increasecl horizonation and ill��viation, than a coarse-g��aEnecl soil of sirr�ilar age (RocEcwell et al,, 19a5). We accountecl for these clifferences when estimating the age of these sniis as follows: For the coarse-grainecl b�r�'+ecl %; soils we uscc�thc gravelly lo�my sand allu�ium that we collccted Frori3 t�e acti�e char�nel ',� as parenf mate�9a6. Fo�• t�e fine-grainec4 surface soils and Yhe ��onclecf cfe��osits, we usec� ',I sandy lo�rrr dllllViLll]l as the ��ar�nt material. Tl�e descri��tions of these c1IIUVEaI ��dl"2f1f � m�tcria[s are includecl i�� �p��endix B, at tl�e end, To ol�tain minim��m age estimates fo�- the soils in tt�e profiles �lescribed, we comparec� the soils' SDI ancl MH1 values with the ch�-onof�mctions presented in Dolan et al. (�1997; see ; Cra��hs 1 and 2 below), which are l�ased on thc chronosequences of the Vent�ira BasiE� by Rodcwell (�983) a�icl Roc�twell et al. (1985), t��� Merced Valley by Harden (198Zj, and Cajon Pass l�y McFaclden anc! Wekclon (�9f37). Since two oi tliese d�ronosequences (Mercecl Valley and Cajon Pass) tlevelo��ecl it� inla��d areas of southe��n Cali�ornia not ex��osec� to coastal Fog, ancl are thus unlil<e the coastal area of San L�ais OL�ispo where the site is located, we also compiled, re�iewec! a�id analyzed Four ac�clitionai soil chronosequences cle�eloped in coastal areas of central and sou#hern California (Rockwe[I et al., 1994; Muhs, 9 982), and in the Ba�a Peninsula in Mexico (Roc�<wel[ et a9., �993), Coastal soils typically clevelop faster than inla�id soils because soclium input from sea spray anc) coastal fog heE�s to deflocculate (clisperse) the clay mine��als (Shlemon, 1978; 5hlemon � and Hamilton, 1979; Bir]<elancl, 798�}, and the rr�oistur� �roviclec! i�y t6�e fog helps to � t�'ansloczte (mobiii�e) the clay fraction clown the sediirrent seciior7, As a result, argillic (Bt} � soil horizons tend to form faster in this environment than in more iniancl areas not subject � to these fluxes. The p��opert€es of �hese soils were q�antifiec! ��s'sn� l�oth the Harcfen (1982) � anc[ Ponti (�1985) methods to c[eveio� soil inclices that we then pfotted as a fu��ction oE time � to develop chronofunctions that would tf�eo��etically be more re�resentative of the sile than � son�e of the ch��onosequences usecl fo�•the soi] �,ge regressions used by Do�an et al. (7 9n7). { p � € d � 3 £ � � } 1 Report—Soil Stratigraphic St�dy in Supportof Faul[investigation Page 4 � San Luis Obispo, Ca{ifornia i , � i ' � 17156 , r 3 � � � l I L � i�lovembe�- 3�, 20]6 4 {=C9 E'roject No. 36i3 � Graph 1: Soil Devetopment Index vs Log Age Regression � = published by Dalan ef al. (1997} and used in this sfudy fo estimate the age of fhe Los Osos Valley Soiis 5 i a ���; 1� � J:i)� f r f' � �y' � Ptiil� it r'� ���r . i j s _ � ^S3` -/!IF � � ^•L5 � [7 _ �1:a-: � r�� �i �'����I .yf'p��P� J'r � � �fl --•.�•IC�v!in�:.y4;.y r 1;�(Ii.i.lti3'i S:ti I .�,Oi;urrn..n�3t�v � u 0„�:ns;i� '{ i; 1 5 ra:i i; � � � i; Y.:i� � - rj:i! . � . . _ . . , , ._,. - ucn J:,a� �mC7 �.�cn :u��in ;cat}a acoru �5 So-7l Odvabpr�+GN IndaM�Spty V�ua i � Graph 2: Maximurn Horizan Index �s Log Age itegress�on - published by Dolan et al (1997) and ��sed in this study to esti�nafe fhe age of the Los Osos Valley Soils !' - 'I r,��� ,= ? [ n � 'E � s:�s€ J,� j� C Y �/` J r� ❑ ❑ � ;'i SU]i /r n F' E f�(fp ��r i `��� � u d G�! � n ` . � ��r , f � �r[A n, -n/� � � /'� ' . _ __-_-__ / . ._—•l!.a:tS�IIU�Urn j �`�11i ❑ •--•_45%f11Y�1[.IC�FV j y4+;l..I C�3rryi:ee:fyol' I (1 f^I�:u1�l1 ; 5���� ' ;� ; 'i I i� : i 1.;u� 5 j � � � asnt.. . . . ...... ..;, . ....._ ...---s..,,,....s-- � ,_ _ ,_....,_„_,., ....__i � 0€O qt0 fi74 t�Hi litd [ce6 p.fn IEril 6:n iiW.l iF.p f £<���m1u�Hd[eon Irv1ai 11,4t1i]YaR�a ' € $ $ ; The age estimates calc�ilatecl usiag soil-st�'atigra�hic methods pro�icle the a�a�roximat� � minimum length of time that a soil was ex}�osed ta soil-forming �rocesses when at the � gro�nd surface, ]n areas where tl�e surface soi] is underlai� by ane ar more b��ried soiis, 9 f2epart—5oif 5tratigraphic 5tudy in 5upport of�au(t Investigation Page 5 � 5an Luis Ob'ss��o, California i i 17157 € � 1 � � i I � € I: Novem�er 18, 20'I G ECI Project No. 36�13 the age o( the k��ariecl soils anc( the ��nc[eriying sediments is best estirnated l�y acldi�g th� age of �he o�erlying, starface soil to the ainount af timc that each of the now-b��ried soils was exposed to soil-forming��rocesses prior to b��riai. This metf�ocl is cansiderecl to ��ro�ic{e j" a rninimum age far the seclimer�ts t�at the sails develapec! in because t��e age estimates c�o � not account far the length of tiine it tool< for the secliments Eo be depositecl, nor do tf�ey include any sails (or�ortions of soil horizo«s) since s-cmovecl by erosian tliat are no langer present in the recorc{. Finally, and af significant note, the age esfirnates of�tainecl by a�taiying these chronof��nctions neec! to k�c evaluated anc3 reconciled with other criteria that also provide general information on the �ossib{e age of ifze sediments. These criteria incluc{e �ut are not � limitecl ta geomor�.�hic position ancl the region's Quatern�ry history, including glacial and [ interglacial events that ciefinec! w�ether the processes of incision, backfili, or soi! formation !� :3 pr�dominated. � � � 3.D F[NDINGS � 3,T 5UMMARIZE❑ 501I. PROFILE ��5CRIPT10N5 l"hree of the soil praFiles th�t we descr�ik�ed in trenches T-1 a and T-Za are relative§y similar � in ap�earance ancl stratigra��f�ic ��ositian. All thre� of these ����afiles have a s�rface soil ancl € two l�urier! soils (Soil Pr'ofile 3 �n Trench 7-2a I�as an additional iruncatecl sail t1�at is buried f under a ]aw-angle fau(t). Characte3-istics of eac� af t�ese soils are sumEnarized be[ow. (=or � tl7e com�3letc sof[ clescriptians, i'efer lo A����enclix B, Surface SoiE; ABt1/A8t2 in Prof`sle 1; A�/AZ/Bt in Profile 2; Al/A2Btj in ProFife 3 The sur�ace soil consists of organic-rich silty clay to silty r.lay loam that is �c:ry darlt gray � and cla�'I< brown when dry, ancl biacl<, very clark k�rown anc! very clarlc gt'ayish brown w�en mois[ (10YR to 7SYR 1�ues). The sectian is k�etween 43 anc] 58 cm thick, anc! has charactet'istics of �o�h A a��d 8t horizons, with structu�-e thal ranges from granular witi�in � the root zane �o strong su�ang��lar bfodty �elow. C[ay films in tf�e argillic section �ary � fr•o�n few to common thin to continuous thicic on pecl faces, cc�a�ing clasts ancl lining clast ` �3ocl<ets. Sancf grains are camtr�an, but fine gravel-sized clasts are f�w anc� scatterpd � th�•oLighol�t. F This cicposit is clistinctfy finer--gr�inec� than tf�e unclerlying b�rrieci soils, with only a #e�+�r ; scattered gravel-sizecl clasts, and a I�igh cancentration of silt. We suggest that it w�s depositecl prirnarily by eoiian processes, either as coastal fog fallout over a ]ong periocl of time {ICeller et al., �987}, or as a ��afeoc�une emplacecl eluring a maE•ine regression, tyFaically 'r during and after a fafling sea level (�rrne, 199b). �rme {199Q) ma��ped several �aleoclunc c dPposits in tf�e study area anci to the sot�th, inci��cEing se�eral that "feather• o��t at 300 m � againstthe 5an Luis �Zange ([rish Hills)." Alt�oug� Or�ne ("19�0) clicl no[ rna�� clune clepasits � in the immeclilte site vicinity, he indicated that Pleistocene eolian deposits in the re�ion � are �uried uncler pE-ec4orr�inan[ly fluvial sequences, resulting in cam��lex stratigraphic _ sections that req�tire additional research, (n �he Sar�ta Maria ancl Santa Ynez valley sa�€th of � Pismo Be�ch, �rtr�e (�990) raappec� severa! ]�te Quaternary clune cleposits mare than 30 � f<m inla��d, incfudii�g ��aleocll�ne secliments tltat nearly w��ap aro�mcl the Casmalia F[il1s. � These observations inrlicate th�t it is pla��sible for sirriilar �aleoclu�e sediments to occur in - the site vicinity, Burl<e et a{. (2016} have studied sec�iments with similar' characteristics in � i � Report��-Soil 5tratigrapf�ic Study in Support of�ault ln�estigation I'age G San Luis O�ispa, Caiifor��ia E � � 17158 1 � E € � i ` ; € � i I �ovembct' 1 tl, 2016 ECI Project No. 3b13 � coastal northern California, anc! suggest that these eolian sediments were cl���ositec� d����ing the lasi giacial �naxiE���m, 20-301ca. �irsi Buried Soil; 28t1<h/38tb/4BCb in Profile 1; 2f3tltb in ProF�le 2; 2Btb1/2i3tb2 in Pr�ofilc 3 ln two of the ��rofi{es c{escril�Pd, the first buried soi[ is ciefinec! hy, or inc�ucles a calcium car�onate-rich argillic ho��izon (f3t1<� with Stage 1 to ll calcium carbonate as coatings on ped faces, lining pores, in veins, and as nod�iles (Machette, 19�5). San L��is �bis��o's cus'reni clin�atic environment (annual a�et'age [arecipitation of 4f3.3 cm anc� te���Perature of 15.2�C} is not cond��cive to tl�e forrnation of Stage I-II calci�im carbonate morphology. These calcic horizons Ehereforc most lil<ely Forn�ecE when this area was c�rier and wa��mer tl�ail today, i; sometime cluringthe Pleistocec�e, This buried soil is a relatively thin, partly trtincatP�l soil thaE�aries in thicl<ness between 39 and 64 cm, A�though Ehese ar� minimum thickn�sses, as tlie A horizons are not pres�rv�cl, and the argillic horizons a���car to be truncated, the I�etter-E�reser�ecf section in Profile 1 is stili thin, suggcsti�g that tf�is buried soil was fanned cEur'ing a clry period, iimiting khe ; etfective de��th of translocated clay. The horizons observed I�ave a silty clay Co silty clay ',� loam text�re, with visib[y mo�•e gravel than the surface soil desc�'ibecl ak�ove, and mode��ate !j to strong suk�angular blocl<y ko prismatic structure, Color h��es arc generally in the 7.5Y� to € 1 DYK range, wi�h low chromas that are the result of over�rinting by (leaching from) the � overlyi�g organic-ricl� su��face soil. 7he clay fifms are wel! cle�efoped, c�escribec� as maclerately thicic to thicl< and common to canti�uotis on pecl faces, coating clasts and on � clast pocl<ets. Afl of thesc characteristics inc{icate a relatively long ��eriod of exposure to soil-forming ��rocesses. [n the trenci� wa[Is that we reviewed, the contact between this first - bt�t�ied soil ancl the underlying buried soil is locally clefined k�y a stoneline consisting of , rounded to subrouncled �ek�k�les and col�l�les, suggesting a hiatus of dc��osition between the deePer bu�'ie�( soil anc{ the o�erlying c{eposit. Secor�d B�ried Soil; SStk�2/5Btb3/5Btb4/C�Stk�5/6k�tb6 in Profile 1; 3B#k�1/�}13tb2/5BtlainT b/5Btla�n2h in Profi�e 2; 3Btb3/4Btk�4 in !'ra€iie 3 In Pt'ofiles 1 anc� 2, fhis seconc� buried soil ranges in lf�ici<ness from 133 to 1 5�1 cm. These are rr�inimum thicl<nesses as tf�e A horizons For tl�ese sails ar'e not ���'eservecl, and the overlying argillic horizons are most �i!<ely tr��ncated. The thicicness of tl�e second buriecl soil in Profi[e 3 is unknown, as the bottom of thc soil is truncated by a law--angle fault, although its original thicl<ness coulcl be ��econstructecl if we are correct in o�r assessmenf tl�at[he I�uried soil below is part of a re�eatecl seccion. In #he area where we descri�eCl our soil prof€le, the fauit zone appears to be enhanced I�y translocated cfay, whereas farther east, closer to what was the slope face ��rior to burial, � the �au{t ti� is obscured k�y soil de�eloj�ment, This suggests that the f�ulting event € �-e}���ese�ted �y this low-angle fatilt occurred when ihe dej�osit was sti11 being ex�aoseti to # �aedogenesis, prior to burial by the overlying allu�ial fan depasits. However, at Station 1.2 � t��e fault��1ane r�tnoved the battorn section f�•orn tE�e zane of�edogenic influence. s T1�ese now-buriecl soils �3evelo�3ed in coarse-grainecl �arent mater'ials that incluc{e many � scatlered clasts severa] inches in c�iameter, yet the texture of the soils ranges From silty clay € to sandy clay, indicating signifiGant chemical weathering of the or€ginal parent material � ancflor accumulation and translocation of wind-tr�ns��ortecl sil� o�er a lengthy pet'iocl oF ; E � �eport�-Soil 5tratigraphic St��dy in Support of Fault 3mrestigation �'age 7 San L��is Obispo,Cal€farnia 4 ; 17159 i I � I F I i ( E � i i ) Navember� 18, 2016 � FCI Project�lo, 36']3 s ; time. `fhe thiclaiess ancl clistributiar� of pedogenic ciay clown tfie entire ��rofile also ; F inclic.aEes that these soils formed during a fo�•rrzer wc�tter climate, most likely duri�ig a i�ajor r interglacial, Calor hues are i�� the 7.5YR range, w�th 7SYR clay films. Clay films an ped � faces are found prefer�ntially in the up�c�r argillic horizon; th� lower argillic horizons ha�e � clay filnzs on clast ��oc!<ets ancl coatin�; clasts. 1"E�ese clay films vary from cornmon anc! thin ' to continttous ancl thicl<, : 5oi� buriec! unde�•fault in Profiie 3: 513tb5/58tb6/6Bt��7/7RCb � This is a coarsenit�g-clownward soil ��rofile that �'anges f�•om sancly clay at thc top ta Eoam at = the bottom, The �rofife is at a r�mim��m 67 cm thicic at Station 1.Z, wl�ere we desc�•ibeci it, ; but thicicens eastward, away from the low-angle fault descf�ibecl ak�ove {at Station 3, th� j profile was at least 1�9 crr� thicic), The bottor�-� of this sail ��rofile �xtends �elow thc clepth ? of the trench, so these tf�icl<��esses are ir�initr�uir� va�ues, � Colors also �a��y with dept}7 �rom brown to dark�rown {7SYR 513 to 313) at the top,ta i ight ; i yelfowish �rown [o brown (10YR 6/�F to h/�}) at the bottoan. C1ay films in the upper sandy �� � clay ancl sancly clay loam sectio��s include many maclerately �hici< on ped iaces, and many � a to continuous rnocle�-ately thic!< to t��ick coaling cfasts ancl lining clast ��od<ets. The soil ;� ; formed in an originally coarse-grained cl�posit that includes many subrounclecl to i suk�angular Franciscan Formation-ty�e clasts u� to 3 inches (7.5 cm? in cliameter weatherecl � = to Stages 2 to 4. � _� This soil appears to represent a re�eated sect'son of the ovet�lying sccond E�uriecl soil vdescriUed above. As we suggested abo�e, this €awer bur'iecl soil appears to �ave been ; removecl €rot� t�c effective de�tf� of pedog�nic inFl��ence by the faulting event, wit� � continued accuinulation of translocated clay after the faulting occurring preclominantly in = the overlying soil ancl along the fault �lane itseEf. To the east, closcr to the slope face, � continuec! soi] clevelopment, ��ossibly enhanceci �y bioturbaEion, abscured t�e {ault plane � so that it is no langer �isible in that area, ln the area where we c�escribec� the soil, �he � deposit �elow the fault was �•emo�ed from the effective deF�th of soil formation such that � �hysical and chemical weathering of t�he sancl fraction ancVor influx of eolia�� silt ceased. ' This explains why this ��rofile is sanclie��than t�e soil al�ove. If this argument is correct, t�e � estimated age of the antire section ii� this area is nat re�resentec! by the sum af the time it � taol< for the surface soil ancl each of the underlying tl�rce buried soils to foE�in. Instead, the f; age of the entir'e section is best re�resented E�y the suin of fhc time it took for the surface soi) ancl each of the first two burieci soils ta �orm, pi��s �he clfffe��ence in age uctween the seconci and third b�ried soifs. ` So�! developed in the Ponded Deposits west af fhe fault in Trench T�l a: � Btb1/BfU2/Btb3/'LBt4b � This soil cleveloped in wE7at 'ss inter��reted ro have been a fining-upward sequence of clean, wefl-sorteci sanr� depositecl in a topog3�aphic low-spot that cievelo��ecl ���hill from the f���Elt ' exposed i�� the trench, F�resumak�iy as a r'es�lt of the most recent earthc�ual<e event on the � fault, [f fhis is the case, then estimating tl�e age of this soil would help establish the timing � of wl�en this fault trace last mo�ecl. This soi{ is o�erlain I�y a 51-cm thicl< su��face sail q camparable to �ha�clescri�ed in Profile �. ' The enti��e profile is 61 cm thicl< and includes four argiffic soil hor�zons that vary in texture � from clay at the top, to silty clay to sandy c[ay in the rrzic[cl�c, and sandy loam to sancly ciay [ � i Repor•t—Soi# SEratigrap��ic Study in Suppartof Fault Investibation Pag�II i � 5an Luis Obis��a, California � 4 i 17160 1 i t f � � � � � November i�l, 2d16 � ECf Projeci No. 3673 E E � loam at the �attom. The up��ee �iorizons h�svc 7.SYR hues antl low chromas, whereas the ` [ower horizons have �Q-7.5YR h��es. Clay filins are comrrton in the up�e�- three hc�rizons, � k with few thic�c and comrrton to many thin to moclerately#hicl<on pet! faces, comman tliin to mo�lerately ti�icic ca�ting ciasts, ancl cammon moclerat�ly thicic lining c�ast pocicets. � 3.2 I�ECiONAL 50IL INDICES USL�D FOR COMPAR150N PURPOSES � ns discussed above, we con���ilec�, reviewec! ancl analyzec! sevcra! soil chronosequei�ces � that hav� I�een clescribecl by others. In �articular, we loalced for soils cfevelape�! in co�stal � areas of California anc� the Baja Penir7s��la that are ex��osecf to marine fo� anc€ thus sodium � influx, on �h� ��remise that tlie SOI{5 at the sitc have bee�� similarly exposed to these ; � conditiot�s, and as a res��lt have de�eio��ed ���ore yuicl<fy thar� othe�� soils fron� more inlancl '- f areas that farmed in similar parei}t materials. �; 3 �: E I; li � f To that enc! we fo�md ancl analyzed data for (our coastal soil chr-onosequences. These ; include ]) soils formed oE� marine [errzces in the near4ay San Simeon ar�a clescr[bed by 4 Roc[<well et af. {19�JA), 2) soils that formeci on tnarine terraces on San Clemente Island € clescr�bed by M�fhs (19a�), .�) soi[s that farmecJ on marine terraces in the Punla Banda �rea � of the 6aja Peninsula (Rod<well et al., 19�7 ancl 3 98�J, based on the summary by Rocicwel] f et aL, 1993}, antl 4) sails clevelapec! an alluvia� tert'aces in the Valle Agua Blanca a�'ea, also � in the f3aja Peninsula, Mexico {Rodcwel� el al., �943). € € i; For the San Simeon anci San Clementc sails, we tool<the soil descriE�tions �»�ovided in those sources and calculated their soil inclices (5D1 and MHI) normafizeel to a total depth of 200 � cm. The Rocicwell et al. (�993) E�ublicatian covering the Punta Bancla and Valley Agua � B[anca soils did nor include inclividuai soil desc:riJ�tions, ��it fhey did provi�le the SD� anti '€ ; MHI values and age estimates fo�' Ehe various ��rofiles that they cfcscribed. �t is impa�ant to � � note, howeve�', that the soil indices that Roc1<well et al. (1993) calculatec! and E�ul�fished for � Y the Valle Agua Blanca profiles WP_I'P, normalized to a de��th of �50 crrt, and we have � ass�imecl that the sarrte is true for the Punta l3�nda soils, altE�oug9� �ocicwefl et al. (�993) do = not say so. This is not ex��ected ta have an im�act o�1 the MH6 vs soi] age regression F curves, as the cliagnostic, better developed horizon �hat pravicles the MHI �alue is iypically s going to be fo��nd i�� the u����er 2Q0 cm, at��l MH1 values are inde��endent of overall p�'ofile 5 thicf�ness, b�it the p�€�lished SDIs Eor these sai{s will be higher than the SDis normaiizec! to � a clepth of 2QQ cm, As a resu�t, theoreticalfy, a soi� age t'egressioil ��lot generzted witf� SD[s � narmalized to 250 cm will yielc! lower age estimates than a regression gene��ateci with the � san�e soil clata but norrnalized to 200 c€n, i � C}E�r ana[ysis shaws that the�'e are s€gnificant differences among the soil indices deveJopec� x fo�' these four soil chr-onosequences. These differences are illustrate�� in Graphs 3 anc[ �� £ � below, Graph 3 shows the Soil Devefo���rent ]ndex {Spi) versus Log Age for Yhe four � inclivicltial soil chronosec�uences analyzec! for this st�ady, and Graph 4 shows the Mean � Horizon lr�cEex (MH1) versus Log Age for fhe same set of soil p�'ofiles. The Punta �3anda, ' Va�ie Agua Blanca, San Clemente, �nd Sai1 Simean soils data �re incl��ded in laoth gra��hs, � with e�cli clataset shown in a dif(erent co€or. J � The San Simeon data we analyzed incfutles twelve soil �rofiles clescril�ed from what � Rocl<well et al. (199�? inferpret�d as three se��arate mariE�e terrac�s (Qt5a, Qt5e, ancl Qt7}. � nithough the num��er of profiies is rel�tively l�rge, the ages of these samp€es are limited to E 5 ; Re�ort—Soil Stt�atigraphic St�tdy in Support of F'ault investigation Page 9 j Sar� L�ris Obispo, California ; � 17161 3 � � � Novembei• I t3, 2016 I:CI f'rojecl No.3G13 �Ill"B�' VilIUCS� res�iiting in � fairly limiled clal�t set o�� the gra�hs usecl far our an�lyses. We o��ted to shaw xi7cl a��alyze the San Simeon snils clata in lwa tliFferent ways: �I) as an a�erage of the SDI ancf MHI values for e�cf� Lerrace (��ink dataset ai� Graphs 3 �nd �), �i1d 2) as inclividual 5D1 and MI-Il val�Fes {I�lacl< clataset), Cr��h 3; Soil De�elopment I��c�ex (SDC) vs Log Age for Soi{s iri Four Coastal Areas in California ancl Baja Califarnia 7 g • • � n • r � � 4 � � a • �5 � • .� " . .. PunGt�3anda 1r�1-ti.9il�ts) m �% �� VallcA�uSl�lanra(r�2-U.95(1Eif d �.- San{:Icmcrtic Ir^l��0,[1�97) c.� ° --- 5�n 5irncan,Av�JQI fr�2-U.U1171 ' � � 5an Simcon,IncL Q!(ML��O.US1f2) 3 0 SO !00 9SQ 20D Soil Ucvclapmen!IndcxValue 7'he c�n�ves si�ow that ti�e San Clemei�te soils yield a li�iear regressio�� solution witl� a negative sla��e, meaning tha� ti�e yoLmgest sails �lis��lay the s�rongest soil charactcristics. 13eca�ise this resul� is contrary to most ok�se���ations thai sFiow an increase in soil indices will7 ina•easing age, we cl�►ase to not ��se the 5an Clemente clata to generale the chranofunctioE�s shown in Graphs 5 and b. Althotigh i�ot as obviaus, tl�e Soil �evelo�3me�it Indices iSDI) calculatecl for the San Simeon sails also yielc� negative s�a�es (see Gi'aph 3). This may be �t #unction af the relatively sn�aEl age data set; it is ��ossible ll�at if a larger spreac! of soils af differ'ent ages were �vailable in the ragion, and these werc descril�eci and analyzec4, the combined re.sults woulc! result in a direcl correlation between S�I and log soil age (m�aning a positive sEope for the linear regression equation). Far ihe purposes of this ��i'oject, I�owever, we chose !o not us� tl�e individual 5an Sin�eQn SDf values to �enerate the chronai�mction shown on Gra(�h 5, Interestingly, the averaged MH] values for each tei'race in the San Simeon area E�lo�as expected, with a positi�e slop� (see pir}I< line in Gra��h 4). As a result, we !<e��t ancE ��secl the San Siineor� average MHI values in gene�'ating the ca�ibinec� MI-II vs Log Age chronof�mclion shown in Graph 6. Graph 4: Maximum I-lorizon Incfex (MHI) vs Log Age for Soils in Fo«r Coastal Areas in Cal�fornia and Baja California , Repart-5oil Stratigraphic Stucly in SupF�o�-t of 1=ault Invc:stigation I'�ge 10 �an L«is Obis��a, C�IifoR•nia 17162 Noveml�Pr I8, 2{]16 I� I:CI Projeet No. 3G13 Ify auiis ir�ruur�uastai r�rta+ � A � o G I� ` B a�'m ► d N N � ai � • • ♦� pp � ♦ s M n "� I'urtla ISanrla(rh2-{}.FS59S u • ■� �-� VaIlcAgua i9lanca(M2=�i1.7G25f q y` �� -+- 5an Clententc�M2-i1,33D5) �de a y S in Simcon,A�r/(rl{r�2-1f,77LG) � ' -•- San Simcon,Intl.Q�(r�l-f}.)li)7) 3 0.0 0.2 O,A 0.6 O.B 1,0 MaKinsu��Norizon lndex Valuc Graphs � (left) and G (righ[): Chro��ofunctions De�e�oped Far fhis 5tucly Using ti�e Punta Banda, Valle Agua Blanca antl A�erage San Simeon Soils Data (MHI only) Gr�pl� 5 shows the Soil Developmer�t Index vs Log Age, incl i Gra�fi 6 shows the Mea« Horizon Inclex vs Log Age These f�mctions w�rc used to calc��late estimated ages for the sails in this sEuciy, with the resuits presented uncler the cal«mn "ComUinecl PB, VAE3 and SSavg° in Yal�lc 1 Regression Curvc,MHI vs Log Age l�egression Curve,SDI vs Log Age I.imiled Dalaset) limi�ed Uatasct 7 � � { ) � . . . � � N ` M � • • • I • �• ��� • i C • • }• �6 N��.��i � � � I o 5 �r ,. i. � � a � � ��s • *. � . •� � ~ Y=3.£17'X+2.if5 � a �M• A ++� Y-�U,UI i22•X-3.49(� i r^2-0.756 i � ��z-o.77�y � ' s 3 0.0 Q.2 4.4 D.0 4.8 1.Q a sv 100 150 200 hLvcimum Horizon Index Vafuc 5oii Ucvclopmenl IndrK Valuc 3.3 E5TEMATED SOIL AG�S F3ASED ON SOIL INDICCS I=o�' o�ir fin�l �nalysis wc usecE fou�•separate soil ch3•or�ofunctians to estimate the ages of the sails clesc�-ibecf for this st�icly. These ch�•onafunctions inc�ude [he Dolan et al. (rt997) SDI Reporl-Soil Slratigraphic Study in S�.ipport of F�3ult firvestigation Page i 1 San l.uis Obispo, California 17163 il Novem�er 18, 201 G i EC! Project No, 3G13 ; and MHI vs I_og Age regressia�is shown on Graphs T ancf 2, �nc! the limited coirrbii�ed d�ta � froi�� ihe coastal SOkES shown on Gra��hs 5 anc! 6. We a{so �is�d the chroi�of�ailctioi�s ; cale�ilated for the f'unt� f3anda and Valle Agua Qla�ca soil indices, since tli�se soil � chronosec�tiences generatecl f�irly ral�ust line�r regressior�s (see GraEahs 3 anc� 4), I� � T17e resti![s of ihese �nalyses are summarized in Table 1. The values presented in T�ble 1 " represent the length of time that elch of tl�e soils in a givcn ��rofile w�s exposed to soil forming ��rocesses when �hat soil was z� the grouncl s�Erface. ns cfiseussed previausly, all OtI1Cl' CDIICIIt10115 �)Cfilg eCjU�l�, CO�5Lc1I SOIIS �I"P. BX�]ECteCI t0 CI�V�IOI] �c�5x2i"2I1�311 IfllclilCl SOiIS, I� Thus, we ex��ectecl t�iat the chronofunctions �leveloped for the P�mla aanda, Valle Agua i €3lanca ancl the coi»l�inecl coastal sails d�la would yielcl younger ages for the Los Dsos Vaffey soils than the �alues obtainecl using thc Dol�n et aL (�1997) regressiQns. However, i� as Table 1 shows, this is not thc case. With the exception af the surface soil fi�am Pr�fil� 3, ,i tf}c� Dalan el al. (�1997) regressions gci�ei�ally returned signific�ntly youngcr ages khan the ' other chronof�mctions. I' � Table T: Soil Devela�me�it Age Estimates Calculated for the 5oil Profiles Described for This Stucly i Meai� Le►�gth of Time Soil Was[xposed fo at the Surface, � basecl on fhe�ollowing Soil ChronvfunCtions: M 5D1 Cvmluined Soil MN1 Dolan et al. Punta (n�20Ucm) I'13, VA�3, Ag��a Slai�ca I (19J7} SSavg* (this ��r��a (this st�dy) I (Avg/Miit) stud ) (tliis st�aclyl Soil �rofile 1, 0.5�bA 40,793 /14,fl14 79,�440 135,0�9 76,11G i� S��rface Soil 93,52 32,�57/10,658 127,7bG 535,799 91,326 ' Sail I'��ofile 1, 0.4814 33,513/11,376 S7,G9t3 �36,7f3�} 55,573 auried Soil 1 93,G3 32,91G/�0,677 128,32�} 519,838 91,G57 � 5oil Pi�ofile 1 0.4093 22,34f3/7,402 29,n4a 34,900 29,06� 8uri�d 5oil 2 72.67 23,52�I/7,57G 55,B9�1 117,623 4b,05� i' Soii Prafile 2, Q35�1 1G,SS'I /5,�I88 1�3,863 ia,5��3 7f3,504 � Sui�€�ce Soil 71.18 22,970/7,393 52,G89 '105,a36 �43,B5G 5oil Profile 2, 0.�}505 2a,163 /9,a62 43,�}�3fi 58,713 �2,08� BuE•ieciSnil3 90,09 31,099110,076 171,51� 404,45G II1,59� Soii Profile 2, 0,�4�4fl9 2G,6�3!b,93G 3�),�133 52,OD4 3�,b00 Buried Soil 2 57,A 1 t�,41 F3/5,9�0 30,5f]8 39,840 Z7,8�)4 Soil Profile 3, 0.286G 11,21213,563 �,724 7,�407 9,6�43 5�rrfaceSoil 5G.7 18,214/5,II33 29,674 37,9�3 27,2G1 Soil I'�'ofile 3, 0.52aG 41,767114,3G9 82,550 142,379 79,046 C3uried 5oil "I 75.11 2�4,4b2/7,£3II4 6�i,57�F 939,8�42 49,89G Soil P��ofile 3, fl,4�4G 23,017/7,b39 31,322 37,305 30,�72 , Buried 5oil 2 59.07 1�3,918/6,d63 32,598 4�4,b52 29,46II Sail Profile3, 0,42bD 24,SS0/8,�77 3�4,785 43,1�.� 33,7�33 Btii'iecl Soi!3 �}1.41 1�4,255/4,54i 7 G,1£33 12,$22 16,5q0 � Ponded D.4255 2�4,�1�32/8,153 34,G28 42,f353 33,G33 De�osits 58.� 'f8,7�I6/6,007 31,86t3 �3,070 2b,920 Abf�reviafions: MHI = Maximum Horizo�� Index; 5D1 � Sail Qeveiop�tiient Index; Pl3 � Punta Banda; VAB = � Valley Agua Blanca; 55avg�San Simeon, terrace average � Re�ort-Soil 5tr•atigrapl�ic 5t�rdy in 5upport af Fault Investigatio» Page 12 5an Luis Obispa, Californi� 17164 F i ` Nqvem�e�' 18, 2016 } I:CI P;oject No.3Gt3 f � The DoEan et al, (1997) soi{ age regressions [ncluc�e c�trves that ca��turc J5% af the claia � � ��secl #o generate the chronof�mction. We fypically use these curves to ca{culate the rr�i�iimum ancE ��axiin�am age values for a given so€) inclex, ancl on Tal�l� 1 we �resent�oth Ehe meclian a��d �r�inimum age values calculatcd usi�ig the Uolan et al. {�9g7) rcgressio�s. :� The chronofunctions that we generatec! (or this s#udy, such as tE�ose show�i a�i Gra�hs 5 ; anc! G, incl��cle 95°1� confic�ence interval (Cl) envelopes around thc E��ec�ian t��at delineate �� the area where the linear E�egression eq��ation that b�st fits the data is lil<ely to be (ocated. >�� These 95% CI envElopes, however, clo �ot capt��re 95% of the data usecl, anc[ are thus not comparaE�le to the envelo�es shown on the Dolaii et al, {�997) g��aphs. Because we did not � develo�� similar en�eloF3es �o ca�ture 95% of the data usecl, all othe�- values on �-al�le 1 i �•ep��esent inedian age estimakes. Give�� th�t the Dolan et al. (1997) regressions genera�l�� �•eturnecl the youngest ages {or• the soils described #or this s#udy, it is our opinion that Ehe E��nim�rm soil develo�3ment age estimates we caiculatecl with tF�ese cf�t•onafunctio;�s � represe��t the abso[�tte minimum ages �ossi�le for thesc cle��osits. � :� � r� � - � = 4.0 DISCUSSION and SUMMAI2Y D� I2�SU�TS � � Gi�en that khe sur(ace so€I clescribeci in Prof€les 1, 2 and 3 is thotEght to ha�e cfeve�opec4 on eolian �� r sedimenfs #hat were most li[<ely cleposited el�rring tl�c fast glacia! �naxim�tm, a�p��oxiirrately 20- ;i � 301ca, the soil clevelo�ment age estima�es calculated using the Doian et al. (1997) regressions ; appear provide the l�est age estimates for ti�ese surFace soils. F�irthet'more, ancl as disc�tssed � exlensi�ely above, the soif age regressio��s in Dolan et al. (1997) return the yo�ngesZ age estimates � for the soils we describec! in the trenches. Since these soils are thought �o be exposed to coasta] � fog, anc( are thus lil<ely to have formec! faster than inland soiEs, the yo�tngest ages seen� to I�e most �' appropriate fo�•this site. { � "rable 2 summarizes our preferred ages for the soils desc�-i�ed for this st��cly, O�rr ��ref�rrecl age for } the surfacc soil is constrained between the irrinimum age ret��med by the Dolan et al. (1997) _ regressions, anck the age of tE�e eolian sec9imenis that this soil Formecl, nssuming t�,at these ealian � secliments began �o be de�ositec� when sea level fel] du��ing the last gfacial maximum, thc soil € ca�not be inore than al�out 18,000 years o1cL 7hus, even though the soil i�egressions ret�i�•necl ages � significan#ly olc4e�-than 18,00�years, we opeed to cap the age of Ehe sw�face soil in �If ex�osures to - 18,OQ0 years. For the b�Eried soils, we chose to give a range of passil�le development ages t1�at �tretch fi�om tE�e F lowest a�erage age returned l�y the regr�ssions to the "middl� of the ��oad" �aiues that �fo not ; exlend into the IOO,OOOs. In ��artic�i9ar, we chase to �gnore the high age estimates returnecl by the . Pu��ta BaRda SDf regressions, 9 r To obtain the total minimum age for � given profile, Ef�e develo�ment age estinZates for all of t[�e ' sails in lha[ profile wer•e adc3ed together, exceF3t for Profile 3, where the second b�ried soil was = te�mcated E�y faultiE�g, and the third buriec! sail lil<ely r�t�resents a repeated sectio� of the second Uw�iec! soil, In ti�is case, we suggest that the age o�th� �ntire profile is I�est re�resc�ted by the sum P of thc �stimatecl time the surface soi{ and each of the first two buriec{ soils were exposcc3 to � peciogenic pracesscs, plus the clif�er�nce in soil-development age �etween the second and third g f�uried soils, Finally, the age of the pondecl de��osits i� detcrmined b}+ �ddi��g thc ]ength of time � tl�at these sediEnents are t;�ougl�� lo have been exposec! to soil-Forming Processes l�efore E���rial, � � Report--Soi1 Stratigrapl�ic Sturly in Support af Fault In�estiga�ion Page 13 � San 1..uis C3bispo, California # � 17165 a ; � NovemL�er 18, 2016 ECI Pr-oject No.3613 plus the age af the overiying surface soil c�eveloped in eolian cleposits. We �sed our preferred age � of the surface soil f��om Profile 1, for lhis calc�€lation, /1�lditionaf clisc:ussion regarcfin� the age of El�ese soils baset! an their geologic liistory is proviclecl in the��aragraphs be�ow. � 1'abie 2: Preferred Age Estimates for fhe Soils and 5oil Profiles Described for tf�is Study 5oil p�'eferred Development Age of #�reFerred Age af Pro{ile lndividttal Soil 5oi1 Profile 1,Sut�face Sail �I 1,000- 1 II,Q00 �� 5oii Profile 1, B�iried Soil 1 33,000- �37,000 ' �oil 1'rofile 1, Suried 5oil 2 22�000-35r000 66,�00 -740,000 Sail P�'ofilP 2, Sw�face Soil 7 G,000—18,Q00 _ 5aif Profiie 2, Buried Sail 1 2a,D00--59,000 Soil Profile 2, Surie�l Sail 2 18,000—�#O,D00 62,000—117,00� Soil {'ro{ile 3, S�tFace 5oil 7,OQ0—18,000 Sail Profife 3, 8���-ied Soi! i 25,000—£f3,D00 f 5oil Profile 3, 13uried Soi12 19,000—�5,�00 � SoiE f'rafile 3, Be�ried 5oil 3 13,000--�43,OElQ 57,Qa0—948,000 I; Ponded De osits �19,000—43,000 30,Q00--G1,OQ0 The first buried soil represents the slal�le grounci surface before the last glaci�f maxima ex��osec! the continenta[ shelf, facilitatit�g buria! �y ti�e eolian secliments in which thc surface soil formccl. This ��aleo s�rface was com�osec� of ali��viai and alluvial Fari deposits that were graded to a �nore distant coastline than today's, ��rol�al�ly the M1S 3 coastline of 3��60 I<a, I�ut not impossil�ly tk�e �1i5 5a at 75-85 ]ca (es��ecially considering that this soi[ appears to E�ave for�ned d�ring a dry ancl warm climate, strcl�i as MIS 5a). � � Tl�e seeontl b�ried soil is [ocally se��aratec[ fr'om the ovei�lying soil E�y a stone[ine, implying at least � some erosional lowering of the seconci soi!'s grounc! s«rface 6efore anci while un�{ergoitig # peclogenic weathering. These deJ�osits coulcf be M1S 5e, with surkace stabiiization occurring ciuE-ing _ MIS 5c, or they coulcl be as old as MIS 7 with the s��rface lowering d�ring MI5 6 and ��edogenic � c�evelopment occ��'�'ing clu�-ing the MIS 5 interv�tls. � � To conclucle, therefore, the surface so�! is a latest I'leistoce��e to early Ho9ocene soil deve[oped on late Pleistocene (MIS 2 - 20-30 ]ca) eolian sands. Those sands blanket a p�leosurface that fo�'med - during M15 3 (30-50 I<a) th�t is �nost liltcly Composed of MIS 4 (b0-80 I<�) secliments, which in turn ! ; oWerlie an MIS 5 {80-124 lca) paleosol develo��ecl uj�on alder al�uvial sediments. Tliis wo�ld be the � i yoL�ngest age inter�reta�ion for al1 the ut�its. � � � � � � 3 �. Report—5oil Str'atigraphic Stt�dy in 5u�port oF Fault(nvestiga#€pn P�ge 3� [ San l.�is OE�iSpo, Califarnia f [ 17166 � 3 3 � 4 i 4. • [ November 18, 20tC� � EC] Praject No. 3613 � We hope th�t the informa�ion ��ro�i�lec! abo�e hel��s you ancl team in further characterizing tF�e � earthqual<e history of tf7is segment of the I_os Osos fa��lt. Tl�anlc you for the o�por�unify to assist � yo�i on this project. Should yoiE k�ave any q�iestions r'egarding the a�o�e, ���ease do not hesitate to a contact tf�e undersignecl at(714f 412-2654, �: � Respecffully submEttecl, 3 EARTH CONSUI.TANTS INTCItNATIONAL, I�VC. i Registerec! Geota�ists anc! Certifiec{ E��gineering Geologists � ��` � � �� ;;. � Tania Goraxaiez, CEG 1 B59 � P��oject Consultant � � [ � - � � f � � � hE >� € F k I 's 3 E F e € 4 f 1 � I� IJ f � L 4 Y S2p Y 3 � � Report—Soil Stratigraphic 5tudy in 5upport of Cault Investigation PagE 15 : San Luis Obis��o, Ca[ifo�•nia � 17167 � f v � � I 7 � i � Noven�ber l B, 20'I G :, ECI Projed No, 3613 REFER�NCES ANb SOURCES Birlcelant�, P.W., 79�4, Soils and Geomor��k�ology: OxForc! 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Harden, ).W., anr� Taylor, E.M., i��3, A quantitative comparison of soil de�elopment in four '� climatic regimes: Qc�aterr�ary Research, Vol. 2B, pp, 342-359, F Harrison, J.B.J., McFadden, E_,13,, Welc�an, R,J., T990, Spatiai sail variabilify in the Cajon Pass cf�ronosequencc: lrnplicatio�s for thc use of soils as a geachranological �ool: q Geomorp0�ology, Vol. 3, pp. 399-47 6, _ jenny, H,, 194�, ractors of 5oi1 Formation: McGraw-Hilf, New Yorl<, 281 p, � ; y Kel�er, E.A., }ohnson, D.L., Rocicwell, T.3C., Clarf<, M.N,, anc! Deinbeoff, G.R., 19£l1, Quatc��nary � stratigraphy, soil gean�torpho[ogy, chronology attd tectonics of the Vent�.�ra, Ojai, antl Sastta " Paula are�as, weste�'n Transverse Ranges, CaEifornia; in Friends of lhe Pleisiocene Pacific s � Cell �ield Trip Guic�Pboof<,�uly �98�. ; : _ Mache#te, M.N., 19�35, Ca1cEc soifs oF thc soutl�wes'tern United States: Geological Sodety of � ; America Special Paper 203, pp. 121. `� � � McFa�lcle��, L.17., 1982, The impacts of tempora) anc� spatiaf clirnatic ci�anges on alluvial soil 3 � genesis in southern California: Ph,D. Dissertal�ion, Universi[y ofArizona, A�30�, � L �� � McFadden, l�.D., ancl Weldon, R, 111, 19�7, �2ates ancl pr•ocesses of soil clevelopment on `i % Quaternary traces €n Cajon I'as5, California: Gcological Society of�rr�er-ica Bulletirr, Val. j; ^ �$, Pl�, ?80-293. ii !; � Muhs, D.R., 19�2, �1 soil chronosequence on Q�ate�-nary mari�ie tcrraces, San Clemenfe ]sland, ;� � Califarnia: Geoderma, Vol. ��3, ��p. :�57-2�3. '1 - . �l � Repoi-t—Soil 5tratigraphie Study in Support of�auEi]r7vestigation Page 16 s San Luis Obis��o, C�fifor-nia i j 17168 j � � 3 � � i; s �lovemL�er 18, 7_0�[G � CCI Pr�aject�lo. 3613 E� � Munsell Calor Charts, 2000, GretagMacbe�h, 61 7 I.itde Br'itain Rtl, New Winc�sor, NY 12553. � National Soil 5��rvey Center, 2.012, Field Boolc for �escribing and 5arnpling 5oils; U.S. i]epartment ofilgrictilture, Natural f�esources Conservation Service, Version 3.�. � �. " Orme, A.H., 199fl, Late Quat�rna�'y coastal dunes of the 5anta Maria area; A syriopsis; rn Lettis, W.H., I-]anson, K.L, 1<elson, 1C[, and Wesling, J.R. (editors), Neotectonics of south-cei�tra[ coastal Cafifore�ia: 1=riends of tlie Pleistocenc P�ci�ic Cell 1990 Fafl Fie1d Toip G�€ide�ook, Septembcr 21-23, 1990, ���. 291-297. �' � 1 � Ponti, o.�., 1985, The Quaternary alluvia] sequence of t�e Antela��e Valley, California: Geologica! � Saciety of��nerica SF�ecia! Paper 2Q3, pp. 79-�6. Rocicwe(E, T. IG., 19�33, Sai1 chronology, geology, ancl r�eotectonics af the nort�-central Ventur� � Basin, California: Ph,D. Dissertation, Ur�ive��sity of California, 5anta BarbaE�a, �2�Fp. Rocl<well, T.1<., 1988, Neptectonics of the 5an Cayetano fault, CaiifoE�nia; Geol�gical Society of America Bulletin, Vol. 1��, ���. �00-513, � Rocicwell, T,[<., Hatch, M.E., ancl Sch�ig, D.I_., 1987, Late Qu�ternary rates, ngua Blanca anc[ � borclerland faults: U,S, Geological 5urvey, Final Technical Re��or't, Contrac�No. l 9-08-OOQ1- � �7012, �22p. (nol reviewec4 for this stucly) � Rocicwell, TJC, Johnson, D,L,, [Ceiler-, E.A, and Dembrof�, G.R., 19d5, A IaTe Pfeistocene-Holocene � soil chronoser�uence in the central Ventura Ciasin, Southern California, U,S.A; in f�ich�rr�s, IC, Arnett, R. anc� EfliS, S., (eclitors), Geo�norphology ancf 5oils George Allen ancl Unwin, p�. � 3 09-32 7. s �� Rocl<wel{, T,[<., I<eller, E,n, and Cla��l<, M.N., 1984, Chronology ancl rates of fa�rlting of Vent��ra River tErraces, California: GeoJogicalSodetyofAmerica Bulletrn, Vol. 95, pp. �1466-1474. f € � Rocl<we11, �., Loughman, C,, and Merifield, P., �990, I_afe Qt�ate�•nary rate of slip a�ong fhe 5an ]acinto fault zone near Anza, so�ithern Calsfornia: /our�nal of Geopf�ysica! C��searcl�, Vol. 95, No. B6, �ap. 8593-II605. � 4 � Rocicwell� T.IC� Muhs, D.R., I<ennedy, G.L., Ha[ch, M.L-., Wilson, S.H., �nd lClinger, H.F„ 1989, � U�•aniu���-series ag�s, fauna] correlatfons and tectonic defor•anation of marine ter��aces �+vithi�7 the Agua Blanca Fauit Zpne at Putita Banda, no��thern Qaja Califor�nia, Mexico; in Ab�ott, P.L, 3 (eclitor), Geologic Studies in Baja Cafifornia: 5ociety of Economic Paleonto[ogists ancl Mineralogists, Pacific 5ection, [iool�63, �p, 1-�6. a g Rocl<well, T.I<., 5ch��g, �.L., and �-[atch, M.E,, 7993, I_at� QuaterE�ary SIfF� rates along the ngua B[anca fa�Elt, Baja Califori�ia, Mexica; i�� Abl�ott, P.L,, San�ines, F.M., and Re��dina, M,A. ? (editars}, Geo[ogic I��vestigations in Baja Ca9ifornia: South Coast Geological 5aci�ty Fielcl °" Tri� Guide�oo!< helc! October 1 G anr� 7 7, 1993, �3��. 53-�2. � � i _ Report—5oil 5tr•atigra�hic Study in 5uppot�t of�=au4t]nvestigation Page 17 S San Luis Obispo,Califa:-nia E � � ' 17169 t � � i{ F ; > � i ; i �lovernber 18,201 G l:Cl Pra}ect E�lo.361:� - �oc]<well, T,I<,, Vatighan, P,R., Bicl<ner, F., and Hanson, I<,f_,, 199�, Corre]aEion and age estimates ; of soi[s c�e�eloped i€� marine #erraces across the 5an Simeon fa��lt xone, ccnti��] Ca{ifornia; ' Y = in Alterinan, I.B., McMuilen, R,13., Cluff, E..S., ancl Slemmons, D,B„ �editors), '; SeisrnotectoF�ics af ll�e central California Coast Ra��es: G�ologicaf Society of A�nerir,a Specia� Paper 292, pp. 151-166. ('� a Shleman R. , 1978 Late uaterna�` evolution of the Cam a f end[eton – San Onofre State Beach , r � � `1 � Y Caiifornia• Consultin t�e�o�-t for Southei•n � hw s 5 � Die o Co�m[ , - Areas No�t e.tern ar Coas#al � r g I � Y g orn� 1' ? Le ' o Com an & Sarr Die o Gds & Electric C an ` �ub �shed �� Ca[ifornia Ecl�s n , , � Y g I Y I --- gg _ M.R,, (<uhn, G.G., and 5Memon, �,J., (ec�itors), 2000, Neotecton'scs and Coastal [nstaf�ility � Orange an�! Northern San Diega Counties, Ca1i(o�-nia: Joint Fielcl Coilference Vol��nies, American Association of Petroleum Geolog�sts, I�acific S�ction, ���d Society of Petrole�tm � �ngi��eers, Western Region, Long Beach, California, June 19-22, 200�, Volu���e ![, p��. 183- � 253. ;� � Shlemor�, R,)., and Hamilton, P,, 1979, l.afe Q�aternaj�y rates of sedimentation and soil fo€�ir�ation, � - Camp Pendleton �- San Onofrc State Beac:h coastai area, so�ath�rn Ca[ifornia; re�E'inted in � Fife, D.L., (editor), Geologic Guide of San 4nofre N��clea�� Gei�erating St�stion an�l ; Adjacent �egiorss of Sotrthern Califo��nia: Pacific Sections AAPG, SEPM 1nc� SEG, March °I = 17, 1979, p�. /�47—/�48, 5 1 � Soil Survey Staff, �975, Soil 7axonomy; U.S. Ue��rtment af Agricult��re Hanclboo�< #436; U.S. ;� E Government Printing O(fice, Washington, DC. �� - i : � 4 Soif Survey Sfaff, "[992, 1<eys to Soii Taxonomy: SMSS Technicaf Monogra��h �119: Pocahontas ;� � Press, Ir�c., B[acl<sberg, Virginia, 5th edition, 55�ap, � _ � - Tinsiey, J,C., Matti, J.C, and McFaclden, L.D., '!982, (eclito�•s}, Late Quaternary I'eclogenesis and : Alluvial Chronologies of the Las /�ngeies �nd San Gabriel Mounkains /�rea, Southern � California ar7d Holocene raulting and AI[uvial Stratigraphy witl�in the Cucamonga Fatil[ ' Zone: A Preliminary Review; Guidebool�, 78th Annual Meeting of the Cardilleran Section of the Geological Society of Ame3�ica, /�na�eiin, Ca�ifornia, /�pril 19-27, 1982, 44�. a i � r i 3 � i � � f � 3 3 � 3 i i 3 fte�o�{--Soil Stratigrapi�ic Study in 5upport of Fa�lt Investigation Page�18 j San Luis OE�ispo, Cali�orni� � 17170 `s , � � November 7 8, 2016 EC] Project No. 3613 APPENDlX B: SDIL DESCRIPTIONS Profile No. 'E: Trench�-lA,at a�out Station 66, on t�e North Wall Dep�h Horizon and below fhe Thickness Photo (not to s�rrface {cm) scale) S°�� Description {ft;cm) Designations 51LTY CLAY; very dark gray{�OYR 3/7} with very dark grayish brown {10YEZ 3/�) clay films when dry, black(10YR 2/1)w�t1� blacic(ZOYR 2/7)clay films when moist, strang rriediurrE angufar blocky soiI structure; e>ctremely hard when dry, very firm when maist, Q-�'�' 23 A$tl very sticky and�ery p�astic when wet; continuous thick clay films on ped faces, (0-23} cornmon to many moderately thick clay fslms coating clasts, many thick cIay films '0 4ining tlast pockets; many fine ar�d comrnon medium rpots;scattered fine gravel; clear � �, wav lower bounda . V j��_ i SIL7Y CLAY;very dark gray and dark brown (�DYR.3/1 and 10YR 3/3) when dry,�lack �'';�= �; and very dark brown {Z OYR 2/7 and 7.5YR 2.5/3)when moist; st�ong medium angular ���-> blocky soil structure;extremely hard�uhen dry, firm when moist, very sticfcy and very 0.7a - 1.41 „�r=_r,, ' 20 A6t2 plastic when wet;continuous thick clay films on ped faces, many raoderately thick and �.v:,.:_- (23 -43) ��,�;..�-a ;,,_. _. ��; commoR thick clay filrr�s coating clasts, continuous thick clay films lining clast pockets; ��'` - �' common fine roots; mix of A and Bt material;scattered fine gravel; c€ear wavy lower �4 ., �y _� - bounda . �--"�:-Y- � ' SfLTY CLAY LOAM;clark brown (7_5YR 3/3)when dry, dark brown (7.5YR 3/2)when ;�����. ' �,_;y;;�' moist; moderate fine subangular blocky to granular soil structure; hard to very harr� �_;;�=�`"r=�==:y when dry,�ery frm when rrioist, sticky and plastic when wet;�ew thick and many to 1_41 - 1.97 _- �',::�r;-=� , (43 -60) �� ;'�=�;<::�"'��� ?Btkb continuous maderately thick clay fiims an ped faces, cornman rnoderately thick elay — films coating clasts,few moderately thick clay fiIms lining clast pockets;few tv '-�e``�J" r common f ne roots; moderately thick calciurn carbonate coatings on ped faces and as 4�`4`'�"�''�'`-` �°, veins;clear irreauIar Iqwer boundary_ a.�=°,�_,� - _ _- _- �, S1L�1'CLAY; brown (75YR�IA�}w[th dark�rown (7.5YR 3/2)clay films when dry, ciark f'�:_, = �"�^ 3 brown (7.SYR 3/3)with very dark brcr�vn (7.5YR 2.5/2) clay films when moist; moderate � �`�=��w� `� fine to coarsE angular hlocky soil structure;extremely hard wf,en dry,firm when moist, �-97-��7z 23 �t_,. 3B� very sticky and very plastic when wet;few thick and many maderately thick clay films (60-83} on ped faces, cornmon rr�oderately thiek elay films coating clasts, rnany moderately thick clay films Iining clast pockets, few thin clay films lining pores; common fine �`�=�; graveI; common medi�m pores; abrupt smooth to wavy ]ower boundary. V ; Report—5oil Stratigraphic Study in Support of Fault Investiaation Page 19 San Luis Obispo, California NovembEr 18, 2016 EC] Project No.3613 Depth I-lorizan and below the Th�ckness Photo (not ta Sa�j Description s�rface (cm) scale) Desi�raafiions (ft;cm) �`� SfLTY CLAY; brown (7.5YR 4/�-)with dark bro��vn p.SYR 3/2? clay films when dry, dark - : brown (7_S 3/3)with dark brown (7_�YR 3/2)clay filrr�s when moist; moderate fine to 4�'�� medium subangular blacky soil strvcture breaking to rnoderate fine granular and single- 2 7Z 3 51 _ grained; hard when clry, firm whEn maisi, sticky and plastic when wet;few moc�erately 24 - =� 4BCb thiel<and common thin clay films on ped faces, common moclerately thick and many (83 - TQ7) �-�-�-,� tf�in clay films caating clas�s, cors�mon moderately thick clay flms lining clast pockets; �"'��{�-=d with pockets of elay;developed on a different sedimentary unit tivith scattered �`��t���� subangular and ang�lar cob�I�:s, cammon subangular coarse gra��I, and rrFore fine�o �v.,;.��.-� ��_;fs,-�. medium sand than ur�its above;abru t waw lower voundary. � �'_;::.::� SILTY CLAY; brown (7.5YR 4/4),witf� dark brown ((7.5YR 3/3 clay fiIms when dry, '� brown {7.5YR 4/3)with darlc brown (7.5YR 3/2?cfay fiims when moist; strong medium �t to coarse subangular blocky breaking to strong�ine prisrnatic soil s�ructure; very hard 3.51 -4.04 .�6 � �� �8�2 when dry,firm when rnoist,very sticky anci very plastic when wet; comrr=an thin and (1 D7- 123} � ���,.:� few maderately thick cfay�1rns on ped faces, many maderately thicic clay fslms caating . �:.��=���" clasts, common moderately thick clay filrns Iining�last pockets, common thin clay '��,�� ;,x {iIms lining pores; scattered subangular pebbles;few to common firre gravel;clear wavy `�`'''� lower bounda ��,�t_:. N SI�TY CL.AY; brown (7_5YR 5/4)with bro�vn (7.SYR 4/3) clay�ilms wHen dry, bro�vn .o {7.5YR 4/4)when moist; moderate fine subanguiar blocky soil structure breaking to --a�4 � single-grained; hard wh�n dry, firm when moist, sticky and v�:ry plastic when wet; 4.Oa-4.76 ~�` 58t63 � cammon to continuous thick clay films coating clast pockets, continUous thin and 2? }�F�Y�%Y (123 - 145} ��.._; ; common moderately thick cfay films lining clast pocke�s; soil developed on a matrix- kcrc:'�" = �=: ,;�'�;'-=Y� °' supported fine-grained mudf[ow deposit with scattered clasts up to 10 cm in diameter, �%�---=---�-�,�� comman suban �lar e€�bEes and ravei; clear irre ular lower bounda . �=�''�'� • 51L71`CLAY to SANDY CLAY; brown (7.�YR 5la) when drv, brown (7.5YR 4/4)when '�__�.-F:�r �'��y�� maist; moderate fine to medium subangular blocky soil struct�re brealcing to granUlar " ��`'��`� and single-grained;very hard when dry,firm when moist, very sticky and very plastie ���5_6�$� 40 -�'� SBtbc when wet; common to many moderately thick clay fiims coating clasts, continuous _ thic[c clay filrns lining clast packe�s; common clasts greater than 10 cm at Stage 2 clast- �` weathering; common fine gravel and comm4n ang�lar#o su�ro�rnded pebbles; '- _ �`� localized iron oxide stainintr;clear irre �lar lower bounda . V N Reporc—5oil 5tratigraphic St�dy in S�spport of Fault Investigation Page 20 San Luis Obispa, California �lov�mf�er Z S, 2016 �Ci Pro'ect No.3613 Depth Horizon and below fhe Thickness PE�o$� {no�to Soil Description sarface (cm) sea@e) (ft; Cm) Desi�nations •-- 'I=��, SANDY CLAY; brawrt (7_5YR 4/4}whe� dry, brown (7_5YR 4/31 wher� moist;weak ��-�' � �;� rnedium subangular blocky soil structure breaking to sin�ie-grained; hard when dry, ^ firm when moist, sticky and very plastic when wet; continuaus moderate[y ih'scic day 6.07-7.'19 34 � _ �� 6StbS f�lms ors clasi pockers, many thin and common moderately thick clay films coating (185 -219} clasts, clay films an rock�raetures;soil developeci on a c€ast-supported, coarser-grazned mUdflow depasit with elasts �0-25 crn in diameter,cammon suk�angular ta subrounded cobbles and common�ne gravel; most clasts at Stage 2 clast weathering,a ��± ^ few at S�a e 3; radual irre ular lower bounda . 1_�"'"=���- SAI�DY CLAY; brown (7.5YR 51�)when dry, brown (7.5YR 4/4)whe� moist;maderate ;`� fine to rnedivm subangular blocky soil strueture;slightly hard to hard and fragic when : ��;,'�.,�� dry,firm when moist, sticky and very plastic when wet;common t�iin clay films on ped ,:;;.. �'j�-&'�6 39 ��•` ' � 6Btb6 faces, common maderately thick clay films coatPng Gfasts, common thin clay films (2�9 -258) '�`'_ -�"�'�- lining ctast pockets, continuo�s thick clay Fi1ms on cIast packets; camrrFon angular to ,;..�. .�__i __ - - - s�bangular�ebbles, common fine gravel; a�rupt smooth to wavy lower boundary to _�,;_�_.�: serpentiniYe bedrock of the Frantiscan Formation below,to the Uottam of t}�e trench at ���'-_�'�`��� a de �h of 302 cm_ - -_� V W Report—Soi! Stratigraphic Study in 5upport of FauIt Envestigation Page 21 San Luis Obispo, Ca�ifnmia �fovember T 8, 2016 ECl Project vo_ 3613 Pr�file No. 2: 7'rench 7'-�A, at about Station 3,on the��ut�-i Wail Depth below the Shitkness �hoto (not to Horizo�n ar�d Soil �escriptian sarface (cm) scaie) Designa�ions (ft; cm) SILTY CI.AY; dark brov�m (7.5YR 3/2)when dry, blaclt(7.5YlZ 2.5/1)wher: moist; 0-0_72 22 A� rnoderate fine to coarse grar�ular soil structure; eutreme�y hard when dry, (0-22) extremely firm when moisf, sticky and plastic when wet; many roots and rootlets, clear wav lo4ver bounda . SILTY CLAY;very dark gray p.5YR 3/l)when dry, black(7.5YR 2.5/1}when moist; moderate fine to medium subangular bloc]<y to granular soil structure; OJ2- 1_38 �� �� �n ext�eme�y hard when dry,firrn when moist, very sticky and very plastic when ��z -42) � wet; many roots; common to many medium sand grains and fine gra�els; clear i to radual and wa lower baundar . � �' SIL?1'CL11Y;very dark gray(7_5YR 3/7)when ciry, black(7.SY�Z 2.5/1)when moist,moderate fine to medium subangular blocky to granular so�l struccure; � �.3g- �,9Q 7b �t very hard when dry, frm when moist, very sticl<y and very plastic when wet; (42 -5g) common thin day�Ims on ped faces, few thin clay fiEms coatino clasts; �� common fine roo�s, many visib�e sand grains and fne gra�els; dear to gradual wavy lo�er boundar . S[LlY GLAY;very dark gray (7.�YR 3/1)4vith brown {7.aYR�C3) clay films when dry, black(7.5YR 2.5/1}with brown (7.5YR 4/3) clay films when moist;strong medium to coarse prismatic breaking to strorg�edium s�bangular blocky soil � structure;very hard to e�remely hard when dry, very firrn wnen mois��very 1.9�-3_08 f �% sticky and�ery plastic when wet;common ta many moderately thick and few {�g- 9�l 36 2Bt{b � thin clay films an ped faces, many thin and few moderately thick clay filr:is � coating clas�s, common tHin clay films ]ining clast pockets; many rootlets; Stage °' I to ll cafcium carbonate lining pores and as nadules; common visible sand grains and smal] pebbles; abrup�wavy lower boundary on a stoneline of rourEded to subrounded ebbles to cobbles. V A Report—5oil Stratigraphic Study in SUp�or�of Fault]nvestigation Page 22 San Luis Obispa, Califarnia NovemFer 18, 2016 ECI Pro'ect No_3613 Depth below tF�e Thiekness Photo (no#to Horizon and Soil Deseription surface (cm) scale) Designa#ions (ff; cm) •-v SANf]Y CLAY; brown (7.SYR 4/4) with dark 6rown {7.5YR 3/4) clay films when '' dry, brown (7.5YR-�/3)wi�h dark brown (7SYR 3/3} clay films when moist; E''`� °' �'. ^ ,:�;t;.=.;f wea[c fine to medium subangular blocky soiI structure breakina to single- ' ��;�.�'�x� grained; slightly hard and fragic when dry,friable when moist, slightly sticky �:,�x.,`°"'�;" 3.Q8-4.30 37 3 •� 3Btb1 anr� slightly plastic when wet;few th'sn clay fi[ms on ped faces, cornmon ta {94- 131} , �;2'S..::- w: . .;�.-_ : many moderateFy thick clay films coating clasts, many thin clay films iining �;:. s r� z. ::��. clast pockets; sand fraction is predorninantly rnediurn-to coarse-grained; many �'�''�;l ��'� fine gra�els anc[common pebbles�veathered to clast-weathering Stages 2 to 3; �� �.+ �_ . �' " �ones of increased cla content; radual wavv �ower bounda . ��'- r.�.`:���`�.�'':� Clasfi-sup�arced cobbly SANDY CLAY; brown (7.5YR 4/4}wi[h dark brown •�,.:.. ��.�;�-� {75YR 3/4) clay films when dry, dark brown {7.5YR 3/3)with dark brown " �Y"-'�� N �/.]YR 3I4)clay films when rnoist;weak fine subangular blocky soil structure �� �-'f'� — breaking ta singIe-grained;slightly hard�vhen dry,friable when moist, non- 4.30-5.09 24 ;��:. =��` 4B,tbz � sticky to slightiy sticky and plastic when wet; many to continuous moderately {Z 31 - 155) v thick clay films coating clasts, many to continuous moderately thick clay films .. n Ifning clast pvckets; with fine gravel and pebbles up to 2.5-inches(� cm) in �� diameter, felsic, subrounded to subangular,weathered to ciast-weathering Stages 2 to 3; sand fraction is predornina�tly medium to coarse grained; clear wav lower f�ounda on a stoneline. "�"�-�'^" SANDY CLAY;dark brown (7.�YR 3/4)with darlc brown {7.5YR 3/3 clay films `� "�`tz'� and Bt lamelfae when d c�ark brown p_5YR 3/4)with dark brown {7.�YR 3/3} I '-��� £�'�=� ' clay f Ims and Bt lamell e when moist;single-grained;sli�htly harc�and fragic � D9 � �� _ . when dry, friable when moist, non-sticky and s[ightly plastic w�en wet(Bt]am ���� �9�� 36 "=�'ri 5�ti,m1 b material); many to continuous moderately thicl<to thick clay films coating �;. '<;_ clasts, many rnoderate[y thicl<clay films lining clast pockets;the gravel and ������ pebbles are f�ner grain�d than above,s�bangular to subrounded,weathered to - clast weathering Stages 2 to 3; Bt lamellae and zones of increased clay are redder in color b�t still sin le-arained; radual wavy lo�ver bounda . V � Report—5oil Strati�raphic Study in Support of Fa�lt Envest'sgation Page 23 San Luis Obispo, California November 18,2016 ECl Pro�ed No. 3b13 Depth befow tE�e Thiclmess Photo{not to Morizon and Soif s�rface ([m) s[ale} �esi�nations Description (ff; cm) y:;;,t`—���.^'-; SANDY CLAY LOAM; dark brown (7.5YR 3/4)with dark bro�vn (7.5YR 3/3} clay '�'�:=a'?'l`=;'=:,�;� films and Bt lamellae when dry, very dark brown (7_5YR Z.5/3}wit� dark brown ':}�'"'�`�:��'�=; (7_5YR 3/3) cIay films and 8t Iamellae when rnoist;sing[e-grained; sl4ghtly hard ' _ ' when dry,friabI�when moist, sf ight€y sticky and slightly plastic when wet; 6..27-7.45 'i ma�y moderately thick clay fiIms coating clasts, many ta cantinuous �7 97 22i� 36 ;;_; 58t,,M2b maderately thiek clay fi[rns lining clast pockets; sand fracc�on is medi�m-to l`� ',�,.,,�;=_� caarse-grained;fine gra�el and pebvles to 1-inch (2_5 cm} in diameter, roUr�ded ''�°==='�.'`-�='; Fo su�anguiar, weathered ta cIast-weat�ering Stages? to 3;clear��ra�y lo.ver _'_.yt, ' ..; i � - _= -: :; [�oundary with anather clast-supported mudflow unifi�vith Eittle soil - - _ developrnent_ T[�is lower mudflow deposit was not described_ Below t�e �=r--�----� rnudf[ow de osit was �edrock of the Franciscan Forrnaiion_ V � Report—Soil Stratigraphic S�ud,v in Supportof Fault[nvestigation Page 24 San Luis Obispo, Ca3ifamia �fovem6er 1 S, 2016 ECI Project No.3b13 Pra�le No. 3: Trench T-2A, at abaut S-EafiioR 1.2, on the North Wall Depth LCI`s below the Thickness Photo (not Horizoo and Soil Geolo�ic svrface (cm) to scals) Designation Elni� Descripfion {ft; cm) Name ---- ' ��'=i SILTY CLAY LOAM; darl<grayish hrown (lOYR 4/2)when dry,very dark j y �_ � � grayish bro�vn (1 flYR 3/2}when maist; moderate to strong coarse 0-6.59 1 g i ' I A7 su6angular blocky breaking to strong fine to medium granular soil structure; (Q- 18) ' hard when dry,firm when rr:oist, nan-sticky to slightly sticky and slightly � -- plastic when wet;common fine roots; scatter�d coarse sand to fine gravel; - � ' �° common fine to coarse pores; gradual wavy lower baundarv. � Unif 7 51LTY CLAY LOAM;dark grayish l�rown (lOYR 4/2)witH brown (l 0YR�/3) : i clay films when dry, very dark brown (10YR 2/2} vyhen rnaist; stros�g coarse 0.59-�.64 - � "' subanguIar blocky breal<ing to rr�oderate fine granuIar snil str�scture and 32 = A2/Btj singIe-grained; slightly hard ta hard when dry,firm when moist, st'sclry and 18-50 - - - ( } plastic when wet;ferv thin clay films an ped faces; many roots; scattered coarse sand to fne gravel; commor�fine to coarse pores; cIear srriooth �.�. _ __ I lower bouncia _ - S]LTY CLAY; dark grayish brawn (7 OYR�/2) witi� brown (l 0YR 4/3)clay filrns when dry, very dark grayish brown (10YR 3/2?when moist; moderate i.64-2.45 . coarse subangular blocky soil structure; hard when dry,firm when moist, (50 -75? 25 ; _-= 2Btb1 Unit 5 very sticky and plastic when wet;few�hin clay{ilms in �ores, many thick r, clay films coating clasts, many moderately thick clay films Iining clast . pockets;few fine roots; scattered coarse sand to fine gravel;clasts are � v°� weathered to weatherin Sta es 3 to 4;ciear wav lower�ounda . — v SILTY CLAY; dark grayish brown (10YR 4/2)when dry, dark brown {1 DYR �� � 3/3)with very dark grayish brawn (�OYR 3/2) c[ay films when moist; strong , .;.,�,_, ; ��-,. medium prismatic soil structure;very hard when dry, very firm when moist, 2p5 -$9}2 ��- �°•� �Btbz Unit 3 very sticky and�ery plastic when wet; continuous thick cIay fiims an ped '�r'z� �. � faces, many moderately thick clay fiIms coating clasts; common coarse �����, ; sand and fine gravel, clasts are weathered to 5tage 3 to 4;few f ne roots; , , =;�.,��a �_.:��;�;�, clear wav ta irre ular lower�oundarr def'sned b a stoneline. V � Report—Soil 5tratigraphic 5tudy in 5upportof Fauft Investiga'tion Page 25 San Luis Obispo, California �lavember 18,2Q16 ECI Pro'ect No.3673 Depth LC['s helow the Thickoess Photo (reot Horizon and Soii �eologit Descrip�on s�rface (em) to stale) Desianation Unit (ft; cm) Name --;.=-�i��� Graveliy 5[LTY CLAY; brawn (�.SYR 413)with bsown (7_�YR 4/2}clay flms ���`�<y��� '"� when ci brown (�I QYR 4/3) with very ciark grayish brown (1 DYR�/2)clay �_:'-�w:..�_� �Y= ;"r,,,.;.'_.'c� films when moist;strong coarse angular blocky breaking to strong fine to Y`_•-�:`-'.. -. � medic�m angular�lacky soil structure at t�e top and strong fine angular -�""�`-:¢,;;'`>�� �locky soi! structure at ihe borom;very hard when dry, extremely firm 2-92 -3.b4 -- '::..:',a�}�' _ r tel ��9 �1�� Z� _- _ _;. 3g�3 when moist,very sticky and very plast�c when we't;cornmon mode a y ��- 3 .._; � thick cIay fifms on ped faces;many moderately thicic clay films coating . `��':`=°�,=�;' clasts, continuo�s moderately thick clay films lining ciast pockets; many ��=,-4'r�'"`_-=:�r:.., N '_,"'�r,-�:=�-.-�,�' scat�ered fine-grave!-sized angular to subangular clast�of Franciscan �° Formation bedrock weat�ered to Stage2 to 3; abrupt to clear wavy lower ��::`:�I~'�t��}�' � bounda �"'"�' �-' �' S1LTY C�AY LOAM; brown to ye[lowish brown {7_5-10YR 5/4)�vith brown I'� .����:. y � � � (7_5YR 5/4�)clay fi[ms when dry, dask yellowish brown (10YR 4/4) when ;�::::• � ,�; hay`_Y_ moist; moderate fine to medi�m subangular bfocky soi! structure breaking ��:;�:�q:-�•:'--` to single-grained;slightly ha�'d when dry, friaf�le rv�en moist, slightly sticky 3_6�-4.53 ::�"�;i;`;;�;{ 46tb4 and slightly plastic when wet;common moderately thick clay films on ped ,��,�, w (7l1 - 'i38) �' '��'��,-�; ,��:� :::�: fac�s, continuous maderately ti�ick clay fflms coating clasts, continuous �.-�.::.�L��:r-� ��.`4�:�;:�:_=� moderately thick to thick clay fiFms lining clast pocketsr scattered ciasts � � '��r. weathering to Sta�e3 to 4; ai�rupt smooth lower boundary defined by a `� ��.;,= faulf. . �<s�-:��;";.� SANDY CLAY; brown p_SYR 5/3)with brawn (7.5YR 413)clay filrns when ` �" � dry, darlc brown (i.5YR 3/3}with darlc brown (7.5Y[Z 3/3} clay fijms when 30 cm �:..�:`".��`�u 'rt�T..rv;�=���" �„� moist;weak fine subangular blocky soi] structure f�reaking to single- thick at , �'�������.� ''�� �'�`'`-° rained; hard to ve �hard when d ver firm�v�en moist, stick and 4.53 — Station ;-���;>�_�;.:;�i - S � rY� Y Y _-�`''�`� v°� fastic when wet; rrian moderatel thick cla films on ed faces, man 4.79 3fOD, ���;�,:r.��_';:� SBtb� � Unit 3 � Y Y Y P Y .,�_, {138— where :x�;��;>���=:r _i mnderatefy thick clay films coating cIasts,continuous moderate y t ic to 346) sample �;::r�;�«.=_:\,;� � thick clay films coating ciast packets; many scattered subraunded ta �;*,,y���r,:__- : was ��.�,�._.�_ s�bangular clasts up to 3 inches p.5 cm} in diarneter cor�sisting Ys'.;�'���-=~� ./}r .....,..r collected �y_.:���r:•.,�� predominantly of Franciscan Formation bedrock weat�sere to Stage 3 to 4, �:�'.w_a��'� chert c[asts weathered to Sta e 1; radual wav Iower bounda . � Report—Soil STratigraphic Study ir� 5Upport of Fault Investigation Page 26 San Luis Obispo, Cafifornia November 7 S,2016 �Ci Pro�ec't Na.36�3 � Depfh � �Cl's beIow fhe 7'hitkness P�oto (not Fiorrzon and Soi[ GeoIogi[ p�ccripfron s�rface (cm} to scale) � Designation Unit (�;�m) I�ame 36 cm � � 5A�1C7Y CLAY LOAM; brown (�I4YR 4/3)when dry and crushed,dark brown (7.5YI�4C3)when moist;weak fine suban ular block sail structure thick at g �' 5tation breaking to single-grained; sligF�tly hard when dry,very friable to friable 3+00, v�rhe:� moist, sticky and plastic when�ret; many moderate�y thick ciay fiIms where 5Btb6 on ped faces, contin�aus moderately thick and common thick clay films sample '.r coating clasts, commoR thick day ilms lining clast pockets; scattered cIasts predaminantly of Franciscan Formation bedrock that range from fine gravel callected d to 3 inches(7.5 cm) in diameter, subrou�ded to su�angu[ar and broken, weat�ered to Sta es 2 tn 4; abru t+<vav lower�ounda . SA�1DY LOAM;yellow�sh browR (10YR S/4}wit� {7.5YR �/k) cfay filrns when dry, brown (7_SYIZ 4/3) tvfien moist; rnassive breaking to weak to rr�oderate fine subangular blocky soil struct�re; slightfy hard when dry, friable wI�en moist, nan-sticky and s�ightfy plastic when rvet;few ta 4.79-�.54 Z3 6Btb7 Unit 2 cornmon tF�in c[ay films an ped faces, comman n-�oderateiy thick and many (746-169) thi� cfay films coating c�asts, many moderateIy thick clay films lining cIast pockets; indurated; con-irnan fine to medium gravel, comman matrix- supported, subangu.'•ar to subra�nded gravel and pebbles predominantfy of Franciscan Farmation bedrock, weathered to Stages 2 -4, less Stage 4 weathered clasts thzn �orizon a�aove; clear wav lower bounda . LaArYI; IightyelEawisF�brown (10YR 6/4 when dry, brown (10YR 4/4)whert moist; massive breaking to moderate fine subangular blacky soif structUre; �.5�-6.73 hard when dry,friable when moist, non-sticky and sIightly plastic w�hen (rt 69-205) 36 7BCb Unit 7 wet; indUrated;few scattered fine gravel up to 2 inches(� cm) in diameter cansisting predaminantly of Franciscan Farmation hedrocic weathered to Stage 3; many rr�anganese oxide stains on pa�ting surfaces;fractured; [ower f�ounda not abserved. V � Re�art—Soil Stratigraphic Study in Supportof Fau3t Investigation Page 27 San �uis Obispo, California �Iovember 18, 2D�6 ECI Praject I�fo.36 i 3 Ponded Deposrt profi�e West of Prafi9e � in Trench T-1A �epth below the �hickness Photo {not 9-Iorizon srxrface {cm} to scaiej Designafi�aro Descripfion {ff;c�n} CLAY;d�rk brown (7SYIZ 3/2) with �ery dar€�hrown {7_5YR 2.5/?) and very dark gray (7.5YR 3/7)cfay fi�ms when dry, darfc brown (75YR 3/2} with dark brown p.5YR 3/3) and hiacic p.SYR 2.5/7)day fiims when moist; strong coarse angular b{octcy soil structure; 1_67-2.30 �g B�b,� very hard when dry, vEry firm to extremely firrri when moist, very sticky and very plastic (57-70} when wet;many thin and common moderateIy 2hick to thick clay films on ped faces, common moderately thick day fiIms coating clasts, many maderately tl�ick clay films lirsing clast pocke�s; many fine rootlets;scattered visible caarse sand grains; clear irregular lower bounda , 51�7Y CLAY to CLAY; dark brown (7.5YR 3/2) and very dark gray (7.�YR 3/�)when dry, dark brown {7.5YR 3/3) znd black(7.5YR 2.5/1) when moist; strong�ery coarse�risma;ic breaking fo strong coarse angu[ar bfocky soi! struct�re; extremely hard when dry,firm to 2.3� Z.99 21 Stb2 �ery firm when moist, very sticky and very plastic when wet; comman to many (7D-91) moderateiy thick and few thick clay fi�ms on ped faces, common th�n to moderately thick clay films coating clasts, common maderately thick clay fiims 13ning clast pod<ets; common fine rootlets; s�attered visible medium to coarse sand grains; clear irregular lower bouncEa SILTY CLAY to SA�iDY CLAY; dark brown (1(lYR 3/3) anc{bfack(1 aYR 2/�)with dark brown (7.5YR 3f2} clay ftlms wnen dry, dark brown (10YR 3/3} and black(7 DYR 2J1?with 2.99-3_31 dark brown (7.5YEZ 3/3) clay films when moist; moderate med��m subanguIar biocky soi] (91 - 70T) 10 Btb3 strucfi�re;very hard ta extremely hard when dry, extremely firm when mo'sst, st�cky and very plastic when we�; many thin to moderately thick clay f�lms o� ped faces, common thin clay;`ilms bridging grains,commoa thin c4ay fiIms ir� pores;few fine rootfe�s; some fine ores;cfear wav lower bounda . ;r SAI�IDY LQAM to SANf�Y CLAY LOAM; dark yeliowish brown {10YR 3/6)with dark yellowisn brown to dar:�reddish brown (70-7.5YR 3/4)clay films when dry, dark brown (1 QYR 3/3}�n�ith dark f�ro�.vn (T OYR 3/3) cIay films when moist few peds with increased 331 -3.67 cIay �ave very weak fine subangular blocky soil structure breaking to single-grained, most (3 a1 -�i 12) �� Z�t�4 section is single-grained;slightly hard when dry, friabfe when moist, non-sticky and slightly plastP�wnen wet; comman thin and few moderately thick clay films coating c�asts; few scatterec€subangular gravel to smali pebbles; abrupt wavy lawer boundary to a cabbl ravel unit belo.N. V � Repart--Soil 5tratigraphic Study in Support of Fauft Irvestigation Page 28 � San Luis Of�ispo, California November 7 8,20�6 ECl Projec��fo_ 3613 Samples af Alluvium Colt�cted from WaIt of the Modern-Day Incised Channe[ {Parent MateraaI) �esignation Photo (not Qescription Lm sca�e) Sanciy Channe� section -;w�'���:;:t� LOAM; brown (7 OYR 5/3) when dry, dark brown (7 OYR 3/3)when moist; moderate fine sub3ngular b�ocky •�'-'"-._'•.: soif strueture;sli�htly hard when dry,friable to firm wher� moist, non-sticky and slighYly plastic when w�t; "' �a�F-.=`. comrnon fine pores; common fine rootle�s;visible medium ta coarse sand grains_ �_���� Gravelly Channel sectian � .-. =`:�' Grave[ly to Stony lOAMY SAI�fD;brawr� (10YR 4/3)when dry,dark bro�vn (10YR 3/3) when maist; single- _ `��'�_�Y�� grained; loase when dry ar�d moist, non-sticky and non-plastic when wet; manv subangular fine gravel, �,- ' ": - pebbles and cobbles up to� inches(70 cm) in dizmeter; predominantEy mafit;sand fraction is f ne-to ���a'"'' ��•`•�-� coarse-grained. ��� --��� V � Report—Soil S�ratigraphic 5tudy in 5upport of Fault lnves#igation Page 29 ' San Luis Obis�o, California � SLTPPLEMEI�TT�L I`Ai]I.T INVESTIGAT�ON I�PORT I�2I�I� HILLS ESTATE TENTATIVE TRACT 2270 �AN LUTS OB�SPO, CALYI+ORNTA Feb�-uary 28, 2000 Prepared for Oasis Landscape FLi�cllitecture anc�Pl�m�ing Pt�epax-ed by Eat�th Systems Pacific 4378 Sanla Fe Road San Luis �b�spo, CA 93�OZ Copyright OO 200� , 17182 � .�.�� ,�,� �� . _ _ ,���A��, ��� d � �Z�ish I�ills, 'I`ract 2270 Febr�aiy 28, 2000 � � reve�se f'aults and a low-angle �l�rusl fault in the so�thern� end �f tltie trench were not active. � However, �n ���e Io��-angle tl�z�ust fault near the noi�thez-�n end (Sta�ion 2f95) of�uesia Trencll T-3, PG&E (19�8) t�oted tiiat ��le thr�st fault ap��eared to e�tend into the coIluvium soil, � suggesting Holocene ac�ivity. A fault investigation perforrr�e� by Earth Systems Cons�tl�ants Nor�hez-�n California (ESCNC) (199$) excavated T��enc[� 1, w�iich consisCed o� 1,325-faot � �ong trencll. This trencl� shadowed C�esta Trench T-3 and was app��oximately 735 feet . nort�iwest af Cuest Tzenc[� �`-3 (see Geo�agic Map in Appendix A). Na evidence of tl�e low- � at�gle tlu�ast faults iz� CuesCa Trench T-3 was observed in ESCNC's Trench 1. William Le�tis � and Assaciates, Inc. {�VLA) (1.999), under contract wzth t[�e County of Sara Luis Obispo � reviewe� ESCNC's fault investigation report. Tlle WLA report review tetter states that the ques�ianable Halacene low-angIe thrust fault in t[�e northern e��d o� Cuesta 'I`rench T-3 may i have been the res�rlt of shi7nk-swell cracking withira the highly expansi�e clay r�ch soil, rathez• tl�az� tectanic faulting. Hawever, to e�aivate w[�ether the tElrust faul� extended to the � north or ��as discontinuous, ESCNC recorr�z�:�en�ed excavating a trench between �rench 1 and Cuesta Trench T-3. Tl�e ESCNC fault investigation report in�icated tl�at if liie�ow-a�igle � rh��st fault was found, it cau�d be mote acc�trately projected across the site. ESCNC also recornmende� excavatzz�g �wo trenches in the southern part of t1�e property (in the vici��ity of � Lots 31 and 34) to evalua�e whether the two secondary faulC spIays are pz-esent in these locations. � I �I � Pui•p��e and �cope.of�oilt � � � The puzpose of tElis supple�nenfal fault i�lvestigation was to excavate a trench t� locate tl�e � � low-azagle thrusl fauit ide�iti�ied ii� the no��hez-n� end o�Cuesta Trench T-3 (PG&E 1.9�8) and � { to excavate twa trencR�es in tI�e sou�l�em part of the site to Iocatc tiie twa secondary fault splays, pursuant to the conditions o�approval for the tentative tract rnap 2270. � Our sco�e of services ca��sisted of t€1e excavatio�� a� 5 lt•encEles �otal'z��g,approxirnateIy 640 li�aeal feet of tre��ch, inteipz•etation and eval�tation of the exposed suf�sar�ace conditioras, azld 17183 � sL-�ooss-�c 2 0002-185.RI'�r � � �L.� y,t � _" ._ ____. ���°��� � ��ish k�zl�s, 7'ract 2270 �'e�ruary 2B, 2000 the pi�eparation Of t�115 repo�t. This report is in�:e�ded to provide supplenle�tal gealogic ii�fo�7nation to the ESCl`TC "Fault Investigation Report"dated Marcl� 1 l, 1995. �04 �'��I.D II���'�'��A'd'�OI� � The tzencl� explozation 3�egan an Novezz�Uer 1S, �999 and was connpleted on NovemE�er 18, . I999. Tr�nch 2��vas sited approximately 44D feet southeast of ESCNC Tz�et�cI� I. and 29D �eet � nartheast of Cuesta Tr�nch T-3 (see App�ndix A, Geo�ogic 5ite Map}, Tz�eneh 3 was located at the boundaYy to I.ots 31 and 32. Trenehes 4 and 5 were located neal• tlie southeastern � boundary of Lat 32 (see Geologic Map): The trenches were exca�atea with a backhoe using a 3G-inch wide bucket_ The depth of t(le trenc�les variea from G to Il feet. Sl�o�ing was used � �o s�ppo�-t the tre�cl; side walls during ]ogging and niapping. After the logging of tl�e side vvalls vras completed, �l�e ht�eiicll was bacicfilled with on-site soils. The soils were backfilled wiEh �ittle or no compactive effort. 3.0 GEOLOGIC�ITS � , � CoIIu�ium (Holocet�e) T11e collu�ium soil tmit {Unit 1} was encountered at o� near the ground surface. Geo�no3plucally, witli respect to the southerr� eage of Los Osos Valley and tlle genexal site vicinity, t31is 50II unit is similar; particulayiy in age, to the colluviu�l soil unit in �G&E � Cu�sta Trench T-3. Unit � is a dar�C gzay to blacic sanay fat elay tl�at �at�ed it� Clizcicz�ess f��onn 2 to 5 fee�, It was stiff, d�y to maist, exllibited �lumet-ous expansion cz�acks that varied fro�t� � 1/8-inch wide to 1/2-inch wide. The colluvium was the youngest soil unit encountered at the site. �G&� aated a charcoaI sample found iil this soil, wiEh age dat�s ra�lgrng from 1,840 to I 2,516 years o�d. The sample was taken from the Cuesta Trench T-3 at a depth of 2 feet, near �tation 8+9D feet. 17184 SL-�0055-G C 3 0002-1 B5.RI''I' r ' �- � �i7sh �'Iills, Tract 2270 Fel�z-daary 28, 2000 � 60� ��I�CLi��g�1�IS I � Thez-e was no evidence in Trench 2 tl�at would suggest the �a�esence of active faulting withili the �ro�osed building areas it� tl�e northem parl of the site. The colluviunl soil (Unit �} was E � geilerally hoi�izo�ita�, co�ltinuous, a�id unbralcen. This soil is sirnila� in age and � stratigraphicaliy to the soil unit o�i which PG&E based their findings for I�olocene fauIt , activity in Zngley Tr�nch T-2 {see Ap�endix B, Iilgley Treilch T�2}. �'he low-angle th�•ust � fault near the��orthern end(Statian 2-�95) of Cuesta Trench T-3 was fouzid in our Trench 2 a� Station 2+25. As the faulti z�t each of the trenches weie fouz�►d to be at an ec�ual e]evation � (elevatioli 163 feet), the str��Ce tEie fauit was detez�nined by connecting grouz�d surface point of eacll fault (Dennison, �966}. The outcrop pattem of tlle fault was then plotted gra�hically I across the site (see Geologic Site Map}. The outcrap pa�tez-� of the fault crasses ESCNC Trencl� 1 at Station 10-�10, whe�e youriger alluvium is pz�esent, The age of the younger � aliuvium was dated (ESCNC, 1998) to be appi�oximately 11,650 years old. No evidence of faulting was observed in this part of Trench 1, therefoz�e, it is concluc�ed tliat the Ior�v-angle � th�ust fauIt near the northerti end {Station 2+95) of Cuesta '�rench T-3 is not an active fauit and tf�at the fault predates the yo�nger alluvium. The g�'avelly colluviuin zone that was � obser�+ed on the hanging wa�I of the fault i�i Trettch 2 probably deveIol�ed postufaul�ing. The fault scaFp may have caused diffe�-ential erosion, consisti�g of scouring of the older alluvium � . and 1z�ixing witli s�a�c wasl� soils, T�ie grave[ly colluviuzz� zone may aiso have been the �-esults o� sorl aver-turning du� to seasonaI expansian a��d contraction of the clay-iYch � colluvium. � T�le seconda.iy low-a�igle thrust fauIt trace at Station F+60 in Cuesta Trench T-3 was also observed in Ti•eaich 2 at Station 1+05. The stiYIce and outcrop pattem of this fault we�e � gra�hically plotted on the Geologic Site Map (see Appendix l�). The plotted trace of the fault crosses Trerich � at Statzon 9-�00 where younger alluvium is presen�. No evidence of I 17185 sL-iooss-Gc s aaa�-�as.ItPT � � ��� t `� -- � � ���s�. rrish �i11s, Tract 22'70 �ebz-�ary 28, �oaa faulting was observed in �his part of Trench �, indicati�lg that the fault znoven�ent �re-dates t[�e younger a�luviurr�. The high-angle faul� PG&� Yx�apped in Cuesta Trench T-3 appears to t�'end south of ou�: Trench 2, as no evi�ence of this �ault was oUserved. TEiis fault is also plotted ou the Geologic Site Map; i�owever, the presence of tliis fanit west ofi Tz�encll 2 is queiYed. I�To , evidezlce of t[lis fault was observed in Trerach l. The pro�ected trace of this fault intex�cepts Trench 1 at Statio�l 7+'10. At Station 7�-'70, a clay-fiIled s[�ear is �resent. The shear offsels Franciscan metavolcanic rock to the soutii agaiY�st Franciscan claysto�le to tlle nortlti ai�d is an inCza-formational fauit, unreiated to the 11ighWangle fa�lt iai Cuesta Trencll T-3. , Tfze fwo faults in llie soutllei�n part of the site that cross Lots 31, 32, atid 33 at-e not active faults, However, the trend of the these faults were�our�d to be slightly difFez-ez�t than the fault ! freitds mapped by Hall and Prior (1975). The faults are spaced n�ore closely togetiier and a��ear to trend moz�e parallel to each other (see Geologic Site�Vlap). � 7.0 �CO��IIA`�`I�I�S � The faults encountered on lhe subject site were determined to i�e Pleistocene to late � Pleistocene age, whicl� are ��ot considered to Ue active, as defined by tEle St�te. Altllough t[�ese faults a��e not active, there is a �otential for �ifferential (hoilzonYal and vertical) � movement and gz�ound cracicing to occur along these �aults during strong giound shalcing from and eaz•thquake event Ti�erefore, it is recozn�xe��ded tha� the building foundalions b� � se� back fi�o�n eacl� fault. The intrauformational faults or shear features observed within ttle Franciscan rocic coznplex are considered�o be'i�lactive due to the Iate 3urassic�Cretaceous age i of the rocks az�d t[�e aUsence of brolcen oz� disturbed colluviu�r► soil overlyin� tizese roc��s. Thez�e�ox-e, �lo bui�ding setback is recozx�me��ded fot- tl�ese faults. Because these ai�e probaUly I 17186 SL�10055-GC 9 ODD2-185.R�'T E . s � 3 i � i s 3� _. F �� V A �`�`� � ... .—_.......— ...--....._,—�T.�_ �___..._ "__�_� �� �� . __ �� ! f € f � _ Tz•isl� J��ills,Tz•�c� 2270 Iiebz�u�ry 28, 2000 ; I � zion-tectotlic zau�t features, J�i-oposecl huildi7igs n�ay str�.dclle tl�ese faults, as differei7�ia1 ; � �ove�ents �lo�g these faulYs wiil Ue 7egligibie. ! E Tlie Uuilding setb�cic disCa��ce was deter�nitied using tl�e following criteria desci7bed Uelo�v. � Di��1�ngle of tl�e Fat�1L � � , _ Co�ilpat•�d to �. ��rt�cai or tfigl�-aiigle fat�ll, faizlts wifih low dip aiYgles, such as thrust fauIts, have a wic�er�one of defozn�atiian due to tile ��ot�ntial for coin��ressional slie�us to develo� in ' I, I the hanhi�}g t�1all bl�c�c. These compressio��al slieaz�s can occur se�e���i �'eet or xilare lway i fz'ozil tlae seconclary antitlietic fault zot�e, I£these sl-�ears are present tf�ey a�e consid�red to be f { p�ut of [he fault zo��e auc{ buildit�gs az•c set l��cic from tlic riZost distal sIiear. Tlte secottdaiy � antitlletiG thrust faults o1�se.r��ed oii t11e subjecl site appear to f�at�e relatzv�ly i�aix�ow zones of � defox��lat'so��, with soine n�inor ftoweixng of ti�e fai�lt just below tL�e colluvillm soiI. Nc� � � � comgressional sIiears�uex-e aUserved adjace�l[ta Ehe fault zones rlttriilg t��e fi�ld iEtvestigatiorl. � i � Activity o�tt�e Los Osos I'�ult i � TI�e le�eI of �ictivity an th� Los Osos I�ault is sig��ifica�itly lower compared to the activity � Ievei on Che active San Andreas I=ault, locaCed 43 iniles noi�theast of Che site, aild tlie IIosgri rault,located 12 nules west, A 6,8 niaximtun ma��ZenC mag�iCude o�cuiring an the Lqs Osos ; � rault lias a recurrenc� iatterval of about 1,925 years, wlti[e tlae rec�irrence interval for a 7.3 i tilo�ilent inagni.t«de eat�ChquaIc� on tlle I3osgri Fault is 64:G years and 2Q6 years for a 7.8 �I � � -i �non��Y�t �ilag�nitude eu-thquake occ«ii�ing o�t tI�e ].8�57 ��up[ure zone of t�ae 5a�� Anclreas rault [ I (CDMG �}�cil rile ReporC 9�-08). The�'�cttz�'ence znte�-val for tlle secoz�dary ai�titlietic tlu-ust `� £alt�ts oi� site is �nncl� longer bec�use tf►ey may not inove dutx��g eveiy e�-tI�quake evczlt tliat occuls on tl�e iilait� trace of ti��e Las Osos rault. Tlus was evident in Tre�iclt ]. whe�•e the two ; �� � ed in our Trencli 2 and Cuesta Ti°e�lch T-3 dic� iiot brea� 11 000+ e�rs ` � tlir�ust faults o�sezv _ � � Y - olc�) youngex- ailuvium i.i� Txe��cl� ]., Based o�l tllis it�ioi�nation, L��e z-ecunence intetval foz• E �i tl-�ese �aults would be n�ote tI��n 1 I,000 years. 17187 � SI..-i0055-GC 10 U002-IBS.Rl'T _,I ��� �. _.�.--- '�� . �� '. ; rl'1SI1 �IiI15,T��acC 7270 Februar.y 28, 2QQ0 �- �,e�€�ei of Iti�I� If one of tl�ese secondary a77tillietic thrust fat�lts did �nove,.i� zs estin�ated tliat �iori�ont� and F_ vez-tical displacemel�ts woulci be �ninor (��2 incIties} ca�n�aied. ro �lisplacelne�ll alo�ig tlie rnai.n tt�acc: of the Lc,s fJsos falzlt. B���ldi�ig foi��tdatio��s may ex�eiience utitior dai��a�e if grottncl ciis��lacemenl �ccurs, b��t loss of life woulct be unlilcely, Also, duc �o the long � �•ect�i-x�e�tce t�3�e��ral of tftese secanc�ary faults, thcre is a t+ery Io��v potentiai for ground suzl��ce , 1'ault r«ptu�•e ta occur. eluri�ig tl�e 75-��ear design life o�the proposeci development. I.. Reco�nrne�ide�SetUac��s [ox���abitabXe St�uctiiz�e � 33ased o�l tlie a�o�+e cr�iteria, it is 3'eca�nmended that buildin�s be seC back a �nizlin�um of 25 feet from sccoiidary antitlietic tEir�st faull ot� the llangi��g wal� Uloek (up-tiu�ot�ln}, wllich ( ��vould be tlle dow��slope oz-s�oz�t�� side of tlle faulE, and IO feet on the foot wall (dotun-thi�ow�i) � (see Geoiogz� Site Map), As a co�iiparisan la tt�e aUot+e z'ecaiiuncnded Uui.Iciitt� setbacks, I Salt Lalce County zn Uta1i ]las iznpleinented a starida�•ciizeci n�e�l�od for caiculating Uuilding setbacics fo�� tli�•ust and revei.'se faulls (Balatiat� and Nelsos�, 1999). Tl�e metiiod consisfis of � the equation S �U(2DfFlta�i q) tl-►at is used ta deternune tlie required setback(�} o�z vatEi tlte hatiging wall ai�d footwaII of tlie fault, wl�ere U = c3�iLicality faclor (1.5 foi� si��gle fa�ilily � � �•esiden�es and 2.0 fo�� co�l��ezcial buildings), b = ex.pecled displacement o�i t�te i'ault, R = footir�g del�cEi, a�td q= di�� of tl�e fault, Usi�ig the�ollou�i�tg esti�nated site p�uamete�•s of U-- � 1,5, D =0,833 feet, c�=4'7 de�ees, �= 3 feet,the equation yielded a �uiIrlix�g setC�acic of G.7 feet. I r�i lkie l�i�h-at�;le fault that crosses Lots 31, 32, a��d 33, at�d the queried high-a��gle fa�ilt ( observed in tlie soutTte�7� e�id of Cuest�TLenc�i T-3 buildings sllould l�ave a n�nirnurn sell��tcic � of l.0 feet on eacl� side ai' the faull'. (see Gedlogic Site I�Zap}. It also reconnzx�ended ttiaE an i engi�ieeri�ig �eoingisE observe footing exca�+at�oiis in tlie vici�izty c�f the ina�pec� faulls to cor�fiz'm t�}eir local�oxi. I 17188 SL-IOOS5-GC I 1 0002-185.RP"1' i � . , . ,. � , _ . r:`. - GEOLOGXC AND SOILS STi7DY ' DE VAi7L RANCH MADONNA AND L05 OSOS VALLEY ROADS � SAN Li1I5 OBXSPO, CALIFORNIA October 7, 1997 $ . � . �. 17189 � De Vaul Ranch � October 7, J.997 �,0 INTRODUCTION Ti�e De Va.ul Ranch property is the p�oposed site of a residentaal subdivision, apaitment coinple�es, a�ad a pi�blic park. One�l�undred sixry-two single fa�nily xesidential lots wi�l�be creat�d, aiong witI� ld zero-lot--liiie residential lots (patio homes}, lazge pa�•ce�s for aparax�ent complexes, and a public pa�k_ The prope�•ty encompasses a Cotal of abou� 112 acres; 56 of these acres will be developed aXld t[xe reinaindec• will be dedica�ed to tlle City of Saii Luis 06zspo followu�g a�ine�atzoil. Approxunately 8.8 acres at the corner of Madoru�a a�id Los Osos Valley Roads wilJ. be the site of the proposed apazt�ne��t co�n�lexes. The zero-lot-1'u�e patio I�ornes will be located iunrnediately ta the soutli of tlie aparanent cornplexes. The remailung lots wi�l be designated as custom. suigle- fa�nily z•eside��tial ho�nesites. These lots extend to tile south fratn t11e pat'to�hoines, a�ld to the west across t�ie pzaposed extezision of Madai�.i�a Road. For the pu��pose of this report,it is assumed that all of the str��ctures will be o�1e to three sCories, of wood-frarne coxistxvction aud will utilize slabs- an-grade andlor suspe��ded wood floors. Iv�a�imum loads on contiz�uaus foundations of 2 kips per foot and inaximuzn loads on spread footz��gs of 10 kips we�•e ass�ned. �dditaa��al i�npro�emeiits pla�u�ed as p��t o�the projec�include the coiisti�ctio�� of several u�texxox• raads p�o�vidi��g access froin Los Osas Valley a�id Iv�adoi�na Roads, two draznage basir�s, a.�id a 4 �ieig��bor�ood pa�k. . ; 2.0 SCOPE OF SERV�CES . �; As �a�t�exatioti rnta the City of Saii Luis Obispo is proposed, an Envi�•orunental �inpact Report ; (E�R} is required by t�e City. Accordiiig ta the City's Reques�for Pro�osals (RF�} for the E�R, ;� � as a�nended by s�tbseqiie��t discussio��s a�xd coz•responde�lce, tiie followiilg scope af work fox• the � geologic eiigi��eei�lg study was dete�rnined: � � a. Zden�icarion of the likelihood of a fault at the base of the �rish Hills and iden�ification of all 1 izl t11e a�ea�1d the ote��tial ina nitt�de of seisinic events on each of the ide�itif'ied � �ct�ve fati ts p g fat�lts. Discussion af the impacts ot geolagic coiidirions o�� tlie pro�osed developmez�t. NGS 10G23-01 1 9709-16S.SER 17190 F: De Val�l Ra�ich �ctober 7, 1997 TABLE Z ACTZVE FAULTS Fault Na�ne Distaz�ce to Nea��est Maximrain E itmated Pealr �•ound Acceleration(�) Poi�it of Fault Magnit�ide (zx�.i�es} (Mw) Mear� 84th Percentile Hosgri 13 7.30 0.28 0.47 Los Alarnos 3$ b.80 0.10 0.17 Los �sos 0 6.8 0.63 1.07 ; ;, Sa�i Aildreas 1 (Parl�ield) 40 6.7 0.09 0.15 ;{ Sa�a Azldreas (Ca�x•izo Plau�s) 38 7.2 0.12 0.20 '4 '7.0 SUBSURFACE EXPLORATrON Two prog�•ams of subsurface explo�atio�� were t�iider�akezl as pa�rt of ti�is study. Tk�e fi�•st was a sez•ies of tre�-►ches t��at were excavated i�� the proposed deve�opmeirt areas. The ptupose of the t�ez�cl�es was to deteiYni�le if a�ay potentially fa��lt-i�elated featu�.�es coitld be disceixied in the areas slated for develop�ne�it. Tlie seco��d type of explora�ion co�idt�cted consisted of sozl borings. The � pt�rpose of tlie boi7ngs was to further define subst�rface soil conditio�ls �vith respect to geotechnica� � ei�gineering properties, a�.�d to acquire samples fox• laborataiy a��alysis. The results of the s��bst�rface exploratioi� azxd laboratoiy a��alysis foixned the basis af conclusions wit�� �espect to the soil a�id geologic i�npacts that ai�e expected to be associated vvitl� tlie project. . � i . � Trench Exploration O�i July 16, 1997 througl-►� July 19, 1997, Trenches 1 tk�rough 6 we�e excavated within the proposed develop�nent areas. The t�•e�icl�es were excavated with a backk�oe equipped �vith a 24 uich wide bucket to aiz average depth of 10 feet. The lengths of tlle t��eilcl�es vazied from 30 feet to NGS 10623-Q1 7 9709-16$.SER 17191 ; . � i € i � E De Va�xl Raz�.ch October 7, 199'1 200 feet. The tre�id o� tl�e henches was appioxiynately north 57 degz�ees east, which is roughiy peipe��dicular to the inapped t�end of the Los Osos �ault. The profiles of tlae explozatoiy t�enches can be fati�ld in Appei�dix B; tlieu a�proxixnate locations ue s1lo�vii on klie Borir�g and Ti�ench Locatio�i Map,also in Appendix B. Tlie tae�lch locations were selected ta deterrzai��.e if �3�e Iutown or suspected fault-related features described earlier extend irito ti�e p�a��ned development areas. Trenches 1 tlu•ough 4 vvez�e excavated i�� ti�e sol�thwester��part of the site ta assess whetl�er a second�•y fanit t�•ace aff the main branctl of tile Los Osos fault, as mapped above elevatiozz 150 MSL by Hall and�'rior(1975),e�ctex�ds uito the plan�ied developzne��t area. T��ezlch 5 was excavaled to explare a ta�ialltopo�capluc luiea�r►ent that was abserved in the field duzxxig our site recoz�z�aissai�ce. Trench 6 vvas excavated to detei7nine �f a vegetatioz� liiieainent �napped by PG&E(1988)near t�ie ceiiter of the proposed developineiit was a fault-x•elated feature. All of tlle six t�•ez�ches excavated oi1 the valley flaor geilexally revealed a sequeiice of st�atified soil units. The L��per sail coiisisted of a da�-k gray sz�ty clay tapsoil rhat was underlaiu by xnattled yellow brown aiid olive brawii silty fule sand witli clay (alluvial. deposits) or a dark reddish b�ovvn, arga�lic i7cli, silty clay {bt�ried topsoil). The contact between the allt�vial deposits and the ',j s�Y�-face or bt�ried tapsail t�ilits was gezierally gradational. The buixed topsoil u��t and tlie u�idc�lyiaig all��vial deposit sequez�ce was repeated at least twice u�Trencl�es 1, 2, 3, S and 6. Tile � soil layers �•aiiged in c�lick«ess f�am 6 inclies to 2 feet a�id were, foz• tlie inast pairt, coiat�nuaus, � u��brokeii a�ld 1lorizoiital. �� i Tt shoL�ld he noted t11at while tt7e soil units va��ed o�ily s�ightly i.�i color and texture, twelve soil � ui�i.ts wefe logged to doctunent tize r�mor soil differe��ces observed in the alluviuin. Detailed descriptio�tis of the soil uiuts ellcouiitered are presented i�i the Trench Profi�es ii�Appendix B. ;I . i ,� The soil units exllibit st�lrctures a�id cantact relatioz�►sl�zps wluch suggest that they vveze deposited as ' alluvzal "overbai�lc" fload plain deposits by low energy currents of the a�icest�ai Prefurno Creek. Occas�onal bteried channels wei� observed whicl� consisted of unconsolidated, ]igEit brown sandy gravel. Tliese cha�lnels were oftei�discon�mlous a��d 'u�regularly shaped. NGS 1Ob23-01 8 9709-1b8.SER 17192 � De Vai�l Raz�cl� �ctober 7, 1447 Tile sidewalls of Trench 4, wluch was excavated ziea�• the southerii margi.zi of t.he valley floor, exposed a daxk gray silty clay topsoil L�z�derlaui by a dark reddislx brown sandy clay i�sidual soil that i� believed to be rezx�.nants of decomposed m.etavolcazu.c rock. Near station�0+00, the residual soil tt'ansi.�ions to a daik reddish bxown silry claq soil. It is bel.ieved that this Iocalized so�l transition is t11e result o�the two soils inixing due to the past erosion and deposition that occun�ed in�11Xs area. Recent chatiLlel deposits consistang o£ s��dq claq vvith �ravel were encoiiu�red at the grou�id si7i�ace o�Tre�icli S. These deposits extei�ded fi•om Station 0�[-00 to SCat�on 23+00, r�vl�ere lliey pinclied out laterally. A one foot thick layer o� sazldy clay �ill was encouzitered at the surface of Trenck� 3. Tlae fil1 conti��ued across tlle ez�tire le��gth of the trez�ch. A�so in Trench 3, the silty sand wikl�, clay graded otilt laterally and was ilot discerluble beyo��d Statioi� 21�+00. Txe�lclx 6 consisted o� a «�iiforrn, 1�0�77o�1ta1 sequence of topsoil �ndex•lain hy clayey fine sand. This soil profile was repeated twice i�i d�e treiZch. A c��•coal sa��nple was couected at a dept.h o� 7.5 feet in tI1e daelc reddisli brown silty clay soil. T'�e sample was age-dated tising tl�e accelerateci inass spect�•oinetry {AMS) method. The �esults of �11e AMS datnig i�adicated the soil at 7.5 feet originated apgz•oximately 2,29Q qears {± 40 years) before present �f-iolocei�e age). This soil date geizera�ly coi7•elates wit1�a soil date of 2,516 before present(Holocene age)£rom the PG&E Cuesta Trencl�T�3. The PG&E t�encli was located south of Los Osos Vai�eq Road approxiinatelq 1 �e west of tlle site, ui the s�ne allnvial valley. The PG&E soil sa�nple r�vas taken at an approximate deptli o�6 �eet w�ere distiilct fat��t traces o�the Los Osos fault were obse�•ved and�apped. I��a£urt�er efforC to locate a��d de£uie the�•ace of the£ault as znapped in the l�i]ls above the site by HaII and Prior {1975) addit�oiial exploratoiy t�encl�es were excavated oz�. August 5, 1997. These treuches were designated as Treuches 7 a�id S. No e�vidence of fanituig was obser�ed ui Treisch 7. The sidewalls of Txench 7 exposed approxiinately 18 i��clies of a dark geaq silty clay topsoil unde�lau� by. a da�•k �•eddish brown NGS 10623-01 .. 9 4709-1GS.5ER 17193 De Vaul Ra��ch �ctober 7, 1997 fractured, �r�oderately hacd inetavolcanic rocic. At Stataon 32-�-00 a �/�" Chick clay filled f�acture was obseived. The f�•acture is not fault related but inay llavc i�een caused �y st�ess from the Los Osos faLYlt or vvas foilned diliYi�g i�ltz�a£o�•matioi�al processes. Fanit related feat�ii�es vvez�e observed in several a�•eas vvithir�the 2�D-foot Xezlgth of Trench 8. Two diswict noz•d�west trending-fault planes wex•e obsei�ved; one at Stafion 0-�13 and the other at Station 0+20. Tl�e fat�Xt pla�les were apgroxirnately 1 to 2 i�acX�es wide and consisted a da��k reddisl� brovvil sandy clay. The clay is decomposed�netavolcazizc rocic that llas been alteted as resulC of the fault move��ent. TI�e fat�lt planes did riot extend up i�to d�e overlyiug topso:�Iayer. T11ey a��e related to stri�e-slip aildlor reverse inoveineiit; i�o evidei�ce of the underl�ulg th��st fault was found. O�� tl�e north side of tl�e fault plazle at Station 0-�-20, the bedrock was distirictly ilaz�der, more competent a��d liad a blocky st�•Lict�ix•e. Sunilar fault p�a��es were obse�ved at Stataons 0-�-85 a��d 1+82. Higt�ly sheared zones were obseived at Stations 0-�70 a�id 1+10. Soil Barings � On Tuly 24, 1997, £ive borings vvere dz�illed at tl�e site usuig a Mobile Di�ll rig, xnodel B-53, eqLlipped witl� ai� 8-it�ch outside diazneler hollovv stein atiger. The appcoxunate Iocatians of d�e �orit�gs are shown o��tt�e Bo�xng and Trench Location�na�u�Appei�dix B. Soils enco��iltered izl the borings were categozxzed a�1d loggcd zn geileral accorda�ice wi�► �lie Uz�i£ied Soil Classification Systetn (ASTM D 248&93}. Logs of tl�e boriligs are presented in Ag�eudix B. As dle boi7ngs were drilled, so�l sa�n�les were o�tauied using a rulg-Xined ba�Y'el sa�r�pXe�• (ASTM D 3550-84, with shoe si�nila�•to D 2937-94). Also, as tlae borings were dd]Ied, stat�da�d pez�etration tests were pei�oi�ned (ASTM D 1586�$4192). Bulk soil sannples were obtaiz�ed from tlle augei'CL11t111�S. Tlie bori�igs revealed profiles cozisistang predo�nula��tly of sandy learl clay az�d sandy fat clay. The cla�vvas i�l a staf£to veiy st�f£cozldifion, and contaii�ed occasioizal gz•avels. rn Bo��uzg 3, a layer of clayey sand wi�I� abL�nda��t gravel was encountered between t11e depths of 4 and 8 feet. ri� Boring 5, a layer o£loose, vvell-gx•aded sa�id was found at a deptl� of 1$ feet, between layers of saildy lea�a clay. Tl�e well-graded sand exte►ided to a dept��of 21 feet. NGS 20623-01 10 97Q9-168.S�R 17194 De�Vau1 Ra�1ch �cto6er 7, 1997 Prinnary Eazthc�uake Effectis At this ti�ne, the site is not located wit�iri a�� Earthquake Fault Zone. There was no physical evide�lce iz� a��y of the tre��c�es t�1at would suggest the presence oF fault.u�g within the proposed developineiit area. Soil layers were ge��erally hoiizo��tal, continuous and u�ibrokeil except in Ti�eiich 8 (oiYts�de the proposed develop�nent a��ea), where evidence of st�ike-slip andlor Feverse fal�ltii�g was obser�ed_ No evidei�ce of tIie underlyixag thiust fault was encountered �n any of khe tt�e�lches. � The vegetative li��ea�nent that was mapped on site by PG&E (1988), t��,e secondary fault t�ace nnapped Uy Hall & Prior (1975), a�ld Clie to�iaUtopographic ]i�ieament obseived dui�lg ot�r site reco�inaissance were fouzld to be t71uelated to faulting. Tl�ese features were due to stu-ficial differential erosioz�, which caused differe�at soil types to be deposited against each other. �T[�e fault featL�res obser�ed a�1d �napped by PG&E in the Cuesta Treilch T-3 displaced sedi�nents believed to be appraxunately 2,�00 years old. Based upon the soil age date of approxi�tiately 2,300 years colJ.ected at 7.5 feet in Trex�ch 6 on the subject site, it is est�x�a�ed that t�e soils at the botto�n of the trei�ches excavated on ti�e subject site in the all�i�al �alley a�e at least 3,000 years oid. In �xew of the continuous azld�a�lbroken co��ditioi�of these soils, a�id that the age of the soils ez�co����.te�•ed o�1 t11e subject site pre-date the so�s enco�u�tered by PG&E, it is concluded that t�ie fault feat��z•es �napped by PG&E do not extend ii�to t�iis area. FatYlt-Related Gz•o��nd R��c�u•e. Based upon tlie abo�e, no acti�e faults a�'e known lo cross or be i�nnnediately adjacent to �lie proposed developzx�ez�t a�ea; howe�er, a thrust fault could underlie t�ie site. If o��e does, it probably would dayli�ht(or coine very near die sui-�ace) ��ear Los Osos Valley Road, or off-site to the ilarth. No vasual evidence of a thrust fault daylight 1in.e was obseived a�rywhere on the site. Therefore, based upoi� the cu�Y�ent level of l�aowledge, the potential for fault-related �roL�nd z•uptu��e iu the proposed biulding ai�eas is considered to be low. Gr t���d Shakin . Ground shaking froin a seismic event is die prunaty seismic haza�'d that wi]1 have the�reatest impacC oii proposed sti��ctures withi�l their designed life s�an, NG5 10623-OI 12 4709-1G8,SER 17195 � I MAP GE�L�G � DeVAUL RANCH - . � Los Osos Va�Iey Road and Madanna Raad San Luis Obispo Connty, California �}1 ',�. �� „ � ., �,` �J._ 'J..C�W`�i v5,./ . f +�� _ , v��u,,�I„_,,��;.�:,; ... . :,�';!�����,,�r R.4r ','•�-Wf]; sr �i. ! 2� � ,..�: �� � ��• � `�' '1` x B� �l, ! � �' \ �� _. _� 7 �• Q�,r' I '. n7�..w � - J �1Y.��:��. A�-{ �Sa"I] liu�,� J \ aCh• ti`'`��-ry`�`:`� ,,��� .. / .. , :)��� '`_�a .�)`', I� �a�k •?ti VO � . .✓/,( '�^--ti i�i � _'� ;I��'- ' . '��__f.-:_r. . ' . �r, :( r 4 '�,yi�� ` �;a':` •' �,. _� �. . ry�/� R. r+��+i'/ 2`%Q$ w! �yil '�.r� Q�...�i` �� ` ' . J' • � y i .j %♦ �� L. 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'..�_./ r' r:- •., 68 a2'3R" � 9 . 10' :�s�� r� r ar�:,•nr'. - ;rl � SCALE: 2 : 24 000 �� Earth Syster�s Consultants �3378 SantFe Ttoad,Stil�,uis�bispo,CA 93401 Nortl�ern Galifot•��i;� (SOS)544-3276 (805)544178G FAX �r Augusk]2, 1997 EC NGS]OG23-O] 17196 I GEOLOGIC CROSS SECTIONS A THRQUGH E [3IGHI.ANA RANCH 7515 LOS OSOS ROAD SAN i,UIS OBIS�O,CALIFORMA A Ar ,00 ...._ . ... . .... ._... _ _ ._ __.. om :�.. 6 =§,wo __ . .. __.. -. soo a g.�. 6 . .___ ..T� .. , � 8 5 ]00 . .. .. _- _... ._'. ...__..... . .-1. - _.1W_.S_. .,_..r._ . _. . � / �'-'--_— . _- .., ' - ,.__ .. �"� �""`J , 5G i(f `�� Kfivv �, r .... Kfmr � ���: ..�. • r � vw -�- .• ___ ._ ... . ..... ... _.... . ,m � sa.r=ioa B' B em r wo ._._ ...... ............ . __. ___ . _.._ ............. ............ � � — � — - � — — ..__._. .. — .r , aon � s �� er.'f � � 4' . SP . ... . . SL. � . .. -�.��. ... __. . �__�_ . �pp$ 100 � .. _ . .. . -- ��._...� _ �_ wl KMv � .__ --�_� -_-_ 1 . I Kim. ` Y � ~ -_ � � .... . . ._ ]m ': ]n0 . _... . ........ . __ ..__._ . .... . ......._........ , ��� Sde 1'=IOV C C� ,00 .. _ . . ....... .. . ..._ . _._ ._ ... ..... �m '` Y�ao -- - _. ..... __._ ..... ... __. ...... wo s .f ¢ 9p - .. � � ,w --- -- �m a _ __ . � gl �Y -' - ~-•-_�-_-- - �.• ,m . =- � �.�•-�� D ' A� � . . ._.. . ..._.. . . --- . . _.. eo� '�� ; � � _ -_ _ __ r ,�? ;: � 6 � s ; � I � ... . . .._ 6 �� ]N � . ...._i+r __-�� ti ....--. ![0� t ..�g sv � t� ar.,. .._.. __ _ ` ..�ti ; arm. - rsm� _. � ' im _ �__._. . . .... ... _. . ._ . �w ` sw.r=�m �; E' ,w _ �,w --._. . ..� - - � --. �� : 8. g 8 'a ` i l � ]m __. _ — . .. ___ . Gm..... .._.. loa& . ; Flov �-•'-�-_� r .: -4�'q4�_+—«_�50 K/mv .; 1�. i � .._ . .. ... . .... .... ...... � . :: Yuli i'+1# � P�r1h lem� eilie ws]sµ�ne-�m��nbru �e s.m.�e no.lswv�meanenv�wi ,.,.+���.mn-ea.��tivr�mm q��� sL.lw�aaA 1 97 i ' TRENCH LOG ; � � HIGHLAND R1�NCH FAULT INVESTIGATION � ; 7515 Los Osos Valley Road I San Luis Obispo County, California � , TRENCH 4 I NF_ „ �,�. TRENCH 5 _�N ' � 0 5 10 t5 20 25 30 35 4D 45 50 55 80 65 70 75 80� � 0 �5 10 15 20 25 30 35 40 45 50 55 60 65� i i 2 i ,5 ' ,. 5 sa �' Sb � 1 �.__. sc: eb 5 g � � 5 � � Sa �Me�.0 cuacN veiNs eeoawc,ru.waasa� � rx�c�veiNs 7 0 ���� 10 10 10 EAST WALL � ' WE3T WALL ,R,�,�„�„� aeoowa:Nsmraw,E TRENCH 8 I _�N EXPLANATION � 0 5 10 15 20' 25 30 35 40 45 50 55 60 65� ! - � ;i � . . 1)Topsoil,SANDY FAT CLAY,dark Crown to blacl�sliff,mo�s'�trace grave�to 1.0'diameter i i 5 86 I � By 5 5)�:Pismo Torma6on Edna Ge SANDSTONE,olive gray,soft,moist,very poorly indurahed ' �5a}SAN�STONE,reddish hmwn,very sa�mois�fine t6 medium grained,weathe2d,very poody to moderately indu2ted,massive � e�.n:«.ow�cm+Gc �cs�*.�*�uao� "�91N'"O°f6°"` �'5b)SAN�STONE,tan,so(�moist,irTegular tedding,rheotic,some qfiche veins and nodules,g2vel 10 '"�` �D and cabbfe size clasts WEST WALL � 5cJ CONGLOMERtTIC SANDS70HE,buff to white,mod�rately hard,mois�modei2tely te well i j indurated,fine to coarse grained Sd)CONGLON{ERITIC SANDSTONE,light brown,modelately hard,mois[,poody indurahed TRENCH 7 ` �� � �� —�N 6 SERPENTiNfTE,broxmlgreenlhlaeklyellow mottled,soft,�mois�severely hac{ured and weathercd, 0 5 'ID 15 2a, 25 30 35 40 45 50 55 60 85 7D 75 80 sheared ', 0 — p :6a)SERPENTINITE,olive greeN gray mottled,modemtely hard,fiactured,sheared 66 � "6b)SERPENTINITE,blue gray,ha�d,slightly moist,fradured and weathered 5 �:rw�es.or,c�ea� � - � � � � 6b -`. — - �- -� 5 6 Franciscan melanae:METAVOLCANSC ROGK,2ddish b`own,moderately hard,mosit,severely � weathered and Mactured � 8a)METAVOLCANIC ROCV�ligh[hrown,moderaSely ha�ki,slightly moist,severely fiadurcd 10 �� - ����-�� � �0 8b)METAVOLCANIC ROCK,olive h�wn,soR,mois�seyerely sheared,vreatheied,slickened sides ' WEST WALL TRENCH 8 TRENCFi 9 ` � , _� � � —�µ i i 0 p 0 _ 0 5 20 25 30 35 40 45� I i 0 15 2 25 30 35 i i ; ; I ; 5h � k � 5 ; a . 5 g a _ _ eb _ sd 5 ! ,�otiM.,u,� ��r 10 ""�'� "�""'" 't 0 �0 WEST WAL_ �p , ; WEST WALL i � Tavaa�awwHo `o�vc' ''"` w,,;,»Ne°�n"`* �.. � 0 5 10 '[5 20 ! � � ' SCALE:1"=5' I , Earth� ste�nas acifc ', �sos�saa-3z�6-�sas3 saa-��s6 F� ,�� 4378 Old Sanra Fe Ro�d,San Luis Obispo,CA 9340 i `' www earths�+s.com-e-mail:esc@earthsystems.com � ~ August2008 I ; SLri5624-GA � � I '� TRENCH LOG HIGHLAND R4NCH FAULT INVESTIGATION 7515 Los Osos Valley Road San Luis Obispo County, Califomia TRENCH 10 i TRENGH 17 -►N -►N � 0 5 10 15 2Q 25 30 35 40 45 50 55 60 65 70 75 80� ' 0 fl 5 10 15 20 25 30 i35 400 I . i... . . 1. i �6h riucrrwcrunec.*c.. ' Bb 5 s _ _ � 5 � 5 _._s _,. . 8c . ' S ,�„x,��.�a� � t . s�..mauomu�ra�c . � rw�xzace.rr�rK.� . , 1Q WESTWALL 10 10 WES'fWALL ��� ', = 10 TRENCH 92 7RENCH i3 TREHCH 14 -►N -�N �►ts O p 5 10 15� 0 0 5 90 15 20 25� O p 5 10 15 20 25 34 35 44 45 50 55 60 65 . 70- 75 80 65 90 95� 1 1 ��� - ; 5 5 5 sh ���� Be 5 5 s�...._ a...._. 5 B eb f f a�e.amwc ' t-fsc„e ' . itl 10 10 10 10 �,_I� . � . . .. ..... ' -� ZO VYEST WALL WEST WALL '""""`""'" � .a�� , � _ . _ 4 TR�NCH 15 �N � 15 _ _ _,_ �5 0 0 5 70 15 2�l 25 WEST WALL p TRENCH 16 20 20 -►N � ea �� 5 0 0 5 10 95 2U 25 30 35 40 45 50 5� 60 650 . 1 I,. . . .. . '�0 � � g �� cJ 82 Bb. i ....._..... 54 � 5 sn�zwc 15 WEST WALL T�,� 95 10 WEST WALL �, �� 10 EXPLANATION TR�NCH 17 TRENCH 18 _�w �w 1�Typ;ojl�SANDY FAT CLAY,dark Grown tc hlack,stift,moi�t trace grevel tc�.�"diameYer O 0 5 'f 00 O 0 5 '100 Sa� Pismp fortnation,Edna mem6er SAN�STONE,oli�e g�wR,moisk�ry poody indurated � q I Sb}SANDSTONE,bn,soR,moist,irtegular bedding,cha Gq some mliche veins and nodules,grave� and coGble size clasts �J 5b �J � 5b $ . 6X SERPENTINITE,tirownlgreenl6lacktyellow motlled,soft, oist,severery fiactured and wealher�d, sheared 90 10 10 �p '6a}SERPENTINITE,olive green!gray moriled,moderafe�hard,hacture�,sheared Q 5 10 15 20 SOUTH WALL SOUTH WP,L� 6b}SSRPENTINITE,blue gray,hard,slightly moisf,SraCure�and weathered 8X Franciscan melanqe:METAVOLCANIC ROCK reddish brown,moderafely hard,mosit,severery SCALE:1"=5' weatheied and fradured �8a}METAYDLCANIC ROCK�ight hrown,moderalely hard,slighUy moist,severely hadured ,8h}METAYOLCANIC ROCK oiive brown,soR,moist,sev�rely sheared,vreathered;slickened sides � I,8c)METAVOLCANIC ROCK,olive to reddish brown,so$moisx severely sheared and weathered � Earth S stenns Paci�ic (805)544-3276-{8Q5)544-1786 Fau �� 4378 Old Santa Fe Road,San Luis Obispo,CA 934QI ww��.earthsys.com-e-mail:esc@earthsystems.com � September 20Q8 � SL-I5624-GA � TRENCH LOG , HFGT�LAND R.ANCH FAULT INVESTIGATION � 7515 Los Osos Valley Road ; San Luis Obispo County, California TRENCH 1 I. ��pV� �,��K�� N� 145 140 135 130 l25 120 115 130 105 100 95� 90 85 80 75 70 65 60 55 50 45 4fl 35 30 25 20 15 'f0 5 0 � GIJCXf VEINS I . , ALOkGSNF�RS �. _________ y' ' —.._�—.._��__»�__ ��___� ____.____� _____�-��_�_. _��� __�____. .._____�_____�_ O .- .. .. � 'l.. �.�� �.. .__. S. .. .. .... .. . .. « . 3 ..... 1 _` _`��`_ �__.._�_'__�__�� � ������(� � n/ � 4 ____ � — — ���, �_ � � e . 5 _ . ...... . .. .. . _ .._ ' 10 U , . � � . .... _ �- f ,�,..,�.��. ^` � • Q "_ iwairnnw. ww;.^ �re.,�a,�....�.u. � _. } �' . _ . ._. �'. . .. _ . . _. _ _ 't5 rcerwcrRocKs�ocKs �,�.� r - y Acmm�ano�,Mornm.c�,Arv .. . . �sriN sEv�r SH�o wwmu� . F#UIT.NEQWVS�NE � ZO . . . . . . . '� __.. . . . . _.. EA57W,4LL 200 195 190 185 �BO '[75 'i7D 'f65 160 955 150 145 0 , _ 1 '� i g - � D EXPLANATION � j � r 1) Topsoil;SAN�Y FAT CLAY,dark brown to black,stifi,moist,trace gra�el to 1.0"diameter 10 - e _ ,_ -6. r m 2} Paso Robles formation:SANpY CLAYSTONE,brown,stiff,moist,Erace gravel to 1.0"diameter, 1$ _ � abundarzt claiche deposits,veins,streaks,and nodules ���o« ��[x.o�� ��T� ��r� '�°"""�"` 3) Paso Robles formation:CL.AYE1'SAN�STONE WITH GRAVEL,orange hrownlgray brown mottled, cur Fw�rcour,s �� Zq = dense,moist,gravel to'I.0"diameter i 4) Paso Rob[es formation:CLAYSTONE:olive gray,soft,moisY,sheared,slickened sides SRENCH 2 '� ��N 5) Pismo fprmation.M�i�c uelito member:SAN�STONE,olive gray,soft,moisf,very poorly indurated � 0 5 '[0 '[5 20 25 30 35 40 45 5 � , 6) SERPENT�N[7'E,brownlgreenlhlacklyeilow motfled,soft,moist,se�erely fractured and weathered, �,: sheared 5 6 �5 6a)SERPENTINITE,olive green!gray mottled,moderately hard,fractured,sheared } 14 7) SILICA-CARBONATE ROCK,olive green,moderately hard,moist,fractured 1� wEST WALL / � Fw�TE.w+u 8) Francisca�melanae:ME7A-VOLCAN€C ROCK,reddish brown,moderately hard,mosit,severely 5 ttnY CAUGE SENI i � weathered and fractured TRENCFE 3 _�N i � Q 5 10 15 20 25 30 35� . i I t °6 a I 0 5 10 15 20 5 e 5 -� � �I � SCALE:1"=5' 10 v�lEsr wAL.L x�svm��x .�''"w��.o�ic Sswaw 10 I , Earth S stems Pacific � ($OS)544-3276-{805)544-1786�'ax 4378 03d Santa Fe ILoad,Sasi Luis Obispo,CA 93401 www.earhsys.com-e-mail:esc@earthsystems.com �~� September 2008 SLr15624-GA � � ��- Geo5olutYons, �n�c. 22Q High Street,San Lqis Obispo,CA 934U1 {805}543-8539,543-2171fax � info@GeoSoiutions.net January 27, ��00 Project No. SL0932�-2 ��r. Richa��� Ka�r�orawski �-i.M. W�S�1" ELJILpERS �F8�1 ��t��i� Av�;n�ae, Suife 99 . (��irr�aril,c, U,� 93U1 U .ytfk3J�C'�'; GeaEogic Fauft lnvestigatian Irish Hilis Devetopment Las Osos Valiey Raad and Madonna Road �an l�uis Obispo Area of San L,er�s Obispo County, CalifQrnia C='z��r t�Is-. {.�moravrski; it�k'I.,RdDiJ�TI,f�� ;n :�c;ccr�i��;�c;� �vii��� aur pr�posaf dat�d December 10, 9y�� w� h�ve c�ntiuct�d a suL�surface fault ir��restiga;ii�r� af tr7e ;:pproxi,7raf:e 13 a�re �]���t3I IJ;;at�C� a��roxi�r�ate(y �rU fset soti�the�st of t�e i��i:s:rsectio��t o� Los C�o� Vailey Road and Ma��onna Raa�� in t�te San �ui5 Obispo Area of the Lounty af Sar� L_iais C��is�o, C�lifomia. Fi�urP � is �� Site �.acati�n Ma�� that identifias the iocation �f tF�e pro��rty. F�gr.,�'�, 2 i� a map Ir�c�icati�c� pE`e�irninary b;�ilding ��ts atld the locatinn of fat�lt �trErach �xcavat�cl tor t��is stt��:1y. �t i�; o�r utider�{�nclir�g ihat tho pr�perty is to be deveEoped with single-fa�nily I��oi'rtes and conda�?�i��iurns. '��lte pU�p�sP c�f thP inv�stiyati�r� wa� to �eteri�ine if the �.os Usos fault or a spfay of the I_os �sos fault is presen# withir� tl�e soutf�ern naEf' c�f the dev�fa�ament area. • During reference review of �� �7rof�ssiana� pa�4r by [_e['tis anc� H<�11, �19;34, � vegetation lineaime�it �possible f�uEt splay) at the �_os Osos fault is sugr�ested in fF�e southern haif of the ��rapos�d development, see Figure 3,�G�ol�gic Ma�. Due to th� inference of thEs lineamen±, � F�tilt trench was excav�ted ta confirm t�e ahsence or pi�esenc� cyi t�e Los Osos faEaf# at the inferred location pasfulated by �ettis and Hafl. i.,+ur scopa of servicPs cortstst�d of managing excavation activities and graphically iogging one; 505- foo# long trench and preparing a descri�tion a� the geofogic units and geologic feat�res obse�ved v��itnin tne fault trench. The trench was ariented in so�thwest-northeast direction (N6UE), �erpendicufar ta tne general east-west trend of the L,os Osos fault. The trench was excavated during fhe persad fraEn January �0, 2000 through ,�anuary 9�, 2000 by a tracked exca�ator to an averag� � de��fh of �� fee# below grot�nd surface. ' 17201 ' January 27, 2000 � Pro3ect No.5�0�321-2 FAU�.�ING Studi�s perfo�med by f'.G. & E. (�988) and Lettis and Hall (1994) ind'tcate that the Los Osos �ault Zone is a northwest trent�ing zone of high and low angle faults thak exhibit a compEex history of both st�ike sfip and reverse dispfacement. The Los �sos Fault Zone is divided into four c�istinct segments. From the northwest to the southwest they are the Estero Bay, [rish Hilfs, l.opez Reservoir, and Newsom Ridge segments. The Site is located near the Erish Hills s�gment. P.G. & E. suggests that the Irish Hills segment displays the most we4i ex�ressed geomor�hic features displacing Eate Pleistocene and Ho{ocene d�posits. A portion of the lrEsh Hiils segment, located approximate�y 6,000 feet northwest of the Site, is considered "active" and has been included as an Alquist-Priolo Earfhquake Fault Zone by the State of Cal�fomia. Figure 4, Earthquake �'ault Zone Map, depicts the focation of the active Los Osos Fault Zone docum�nted by the State of California. A Maximum Credible �arthquake of 7.Q magnitude and a Maximum Probable Earthquake of 5,3 magnitud� is associated with fhe fault. At the base of I�ish NiEls, approximately 450 feet south of the southern property �ot�ndary, Lettis and Hal1 mapped a topographic sca�p associated with the l.os Osos fault. This topographEc scarp and the vegetation lineament ak the Sike are depicted on Figure 3. G�OLOGIC UNE7S The subsurface trenching investigation was compl�t�d into Holocene age (last �O,OQQ years before present) al[uvium deposits. Dibblee, 1974 and HaEi and others, 1979 classify these alluvial deposits as consisting of cobbies, pebbles, grave[, sand, silt, and clay. Thickn�ss of this unit at the Sit� is unknown but Hall, �973 depicts a 90-foot thickness on a stratigraphic column on his gealogic map, The trenching investigakion exposed only alluvia{ deposits. Stratigraphically t�nderlying the alluviaf deposits are Franciscan rocka consisting of gr�ywacke sandstone, sheared sha�e, bEueshist, and metavolcanic rocks. Franciscan rocks are Cretaceous to Jufassic age �63 million to 205 million years before present) and are estimated to be thousands of feet thick. Groundwater was measured at a depth of 25.2 below ground surface wikhin a water weil Eocaked on Site. SubunEts within khs alluvial deposit were mapped and are depicted on a s�ries of trench Eogs, Figure 5A through 5G. The upper one to three feek of surface soi! consisted of dark brown, dry, si{t and dark brown silty clay. selow the surfac� soil, a three- to four-foot thick, brown sandy siit was encounter�d in a moist condition. Below .this, a .�.5-foot thick, dafk b�own cEay was used as a "marke�" or locator bed th�oughout most of the trench length, �xcept for one Eocation {to be discussed belaw), .this unit was consiskent in thickness and lithofogy. Below the marker bed, a three- ko five-foot thick brown, moist, clayey silk was encountered. Conspicuous within this unit, we�e lensas of cobbles, gravei, and sand rnost likely c�eposited as fluvial channe� deposits. An approximate one-foot khick, dark brown clay and a thicker, brown sift comprised the bottom of the trench. A fluvial channel feature was mapp�d in the vicin�ty of the 253 foot to 3QQ foot interva) within the tr�nch. The channel was approximately 50 f�et wide at th� top and tap�r�d with depth to approximately 5 feet wide. This deposit was loose and was compr�sed of gravels, sand, cobbies, and mino� silts. The dark brown clay marker bed was observed d�'aped within one sid� of this channel indicating fast deposition of the coarse deposits. The bottom of the channel was located to verify . depth. 1.�� , 1� ��.����� : 2 " _.. � : ......�_.._._... -..�_�._....�.,,_.._...._..._ �__��.�,��.�.._...._.,.._,..._.��_.,..�,._..._._..._.��-"-�---�---.��...__._....._....--....... ii2o2 January 27,2D00 ProJect No.S1.01321-2 DISCUS510N Prior to excavation activities at the Site, surface topography exhibited a very slight depression in the middEe section of the (then) proposed fault trencn. It was postulated that this surface depression correspond to the vegetation linearr�ent published on the Lettis and HaEI, 1994 geologEc map. 5ubsequent to trench excavation, the surface depression was found to correEate with tE�e fluvial channel feature observed in the vicinity of the 253- to 30Q-foot trenci� interval. Loose, subsurtace channel deposits at this location may have consolidated thraugh .time causing a slight surface depression. In addition, the coarse channel material may have allowed increased groundwater movement in this area creating increased vegetation growth or a "vegetatian lineament" as observed on the L.ettis and H�II's 1994 geologic map. Wiki�in the faul# trench, no faulting characte�istics were observed. There was no offset bedding and no folding indicating subsurface stress from below. No caliche (caicium carbonate deposited by groundwater) was associated with the trench. Caliche is sometimes fills voids within fault-disturbed sediments or rocks. GeoSolutions, Inc. is in tE�e process of completing an Engineering Geology Investigation and Soil �ngineering Investigation at the Site. These studies wil! include subsurface drilling resulfs to depths of 5� feet below ground surface anc! wif! allow fo� c}uantificatio� of subsurface condEtions. GeoSolutions, Inc. will monitor driilEng operations for indications of changing subsurtace canditions other than those founci with3n the fault trench. CONCLUSIONS A 505-foot long trench was excavated within Holocene (last 10,000 years) alluvial deposits at the south end of the proposed Irish Hills Development, The Development consists of approximately 3.8 . acres of vacant land located approximately 5fl0 feet sautheast of the intersection of Los Osos Valley Road and Madanna Road in the County of San Luis �bispo, California. The purpose of this investigation was to verify ti�e absence or presence of tE�e Los Osos fault in t�e sautherly portion of the Site. A geologic map published by �ettis and Hali, 1994 depicts a vegetation lineament through the southwest por�fon of the Site. The Lettis and HaEi publication suggests the vegetation lineament could be a splay of the active L.os Osos fault. No evidence of faulting was identified within a 50�-foot long fault trench exca�ated ak the Sike. Th� Eengtl� of the fauEt trench more than adequately investigateci any possibility of tE�e presence af a fault af the Site suggested by Lettis and Hali, �994. The vegetation lineament published on the L.ettis and HaEI, 1994 m�p coincides with a subsurface, sedimentary channel feature in the vicinity of the 253-to 300- foot trench markers. It is our opinion that the vegetation Iineament from the Lettis and HaIE, 1994 geologic map indicates a subsurface sedimentary cnannel feature a�d r�at a spEay of the Los Osos fault. It is recommended that an �ngineering Geoiogist periodically review grading operations to observe subsurface conditions at the 5ite. Thank you for this oppor#unity ta have been of service. If you iiave any questio�s re ' ent of th�s ietter, pfease contact this office at y nv�nie�ce. ��a ��p� ��ptio GF�� '�'� '�' ��`r SincerelY, �ca�� �.U. kq �c! '� � `�'.a GeoSoiu#i ns, r�c, � ,�,� �� s� � `' o r� p � � No,z�fa �' ,�etfn M.D. ammer • CERTlFIEa • Ric atd A.� f �t�� Project � ' ering Geofogist ���'��EER��� Senior Engi 'ng G��alag t q. ��;��;. P.f� ,f,� GEOLOQlST `� � ♦ � � • --.........�..�1-�_.. ...._.�...._,_.......,�_._...._.�_.y... ��`��t4���� �......�.�.....__...�_._.._..._-___..._...w_._..__ , �U3.. ,fanuary 27,2000 Proj�ct No. SL6�321-2 FtI�����i�CE� CDMG, i959, Geofogic Ma� of Caiifort�ia, 5an l.uis Obis�a Sheet, Scale i:250,00D, r D'€bblee, l�orr� W_, 197�4, Geologic Map of th� 5an Luis C}bispo 15 Mir�ute Quadrangle, Califort�ia. Hail, Cfarence A,, Ernst, W.G., Prior, S,W., and Wies�, J.W., �979. Geologic Map o#the 5an l.uis Obispo-5an S[meon Region, California. Ut�ited States Gealogical Survey, Miscelfaneous Field Studies, Map MF-�097, Jennings, CharEes W., 1994, Faul# Activity Map af California and Adjacen# Areas, Division of M€nes and Geology, Geolagic Data Map No. 6. !_ettis, Wilfiam R., and Hall, N, Timothy, 1994, l.os Usos #ault zone, San Luis Obispo, C�Iifornia, in 5eismotecton�cs of tf�e Central C��ifurnia Coast Ranges, Geological Society of America Special F'aper 292, 1994 San Luis Qbispo Cuunty DePartment oi Planning and Suildin4, June, 1998, 5afety Elemant, San Luis �bispo County General Pla�. � State of California� Specia! Studies Zonas, January 1, '1990, San Luis Obaspo Quadfat�gl� Offcial Map, � f � � � � � � �... �:� �. �;�,, � � ..�._,.---..__T -��.�_._._.�T-----__.__._ __.�.�,w....__.Y...—___...�_......�....._.....�._,__._._.._., 17204 � ._...._.__,.. .... ..__._ ._._. ._.. ...._ ,...._..,.,._ ._.., � .. - �-- - - .. r,'�`,�, . .. _ .._ . ._ . . ._.._..._ - . ; sax�wc . 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'y's �.1`�.`• .r.4�f' -1.�,1 s«� ^����1,1..�,51, };' .. .' � �� '. . , . _� . ♦�1 i . . �. . . �R . � � " ' . .r. ��\ '�1���.� `� S �� ♦ � o� 1 aaoa saoa rt � � � � a . ,.,,,,,,,T... � .���.__.._T i o �ooa Zaaa m Cor�tour E�terval ao ft From Lettis and Hali, 'l994 GEOSOLl1TIONS, �NC, GEOLOGIC MAP FIGURE: 220 HIGH STR��T 3A 5AN LiJfS OB�Sf'O, CA 93401 IRI6FtHILLSOEVElaPM1I�NT ���CT: (8D5)543-8539 �AX; (805) 543-2177 SfiN LUIS qB{SPQ,CALIFORNfA SL0132�-2 MAP SYM90LS _ �a�k—OatheC whete apprpzimately bcaied:Coited where mncealed; �ESCRfPTION QF MAP L]N7T5 . U -. U=up�y down indica[es rela6ve seRse ol displacemenr,small artov+and numhef •73 6• 4qtli:ate szrike and dip o!fault exposed in ou[crop . � Slream deposa Nolocene � Aer'sal�hato lineamen[—Of 1au11-rela[ed teafure:dashetl where less disiinct;queriad �� >>�dPta��s arid cnannels�—���nsolidaled cobbles,pebbles,sand.and silt in active c � whese unCertain;hactwres indiC3ie topog2p�,ic sca:p and show stope direcsion; �r Aciive sveam channei xai�ne 'I'— T' ld x Sinear drair�age,tc=tonal cornrasl,v.�egetalion lineament,da=dellecte�tlrainage, { 1 . his=break in s]ope,s=Saddie,5hb r side hif?hench �� ? Eolian deposit{Holocene��pper PEeistocene}—Unconsof;azteC;o modera�ely consoEidatEd Los QsCs fault Ci Hai�{�BTd)—Oashed where a¢praximaleiy bcated: r W��b'"'r'��f2=yourgesL'��oides.) �� -��� tlottetlwhereconcealed Fl��ialandailuviaide � � A6sls(Ficlocene-upper Pleistocene}_...Un�nso�idatetl cab5les,pehhies, NaEE and others{1979)—�ashed where approxlmaieiy localetl:tlo�led where concea€ed h�sin.ns of v�alle sa Pi'e siream channels and flo0dplains,and in�k,vial ierracas inseE wiihin - --L�—..p.. Etlna lautt � Y ( Y9'�nqasI.7�oltlesif � Colfuvial depOSit(Hoiocer�-pieisfocena)--�L'n�nsolitlaEed,poorly Sort2C bouiderS,cabbtes, —��•.�.. IndFan Knob Sault �� peChlEs,sand,Silt,and Giy dapqsifed as a rewJt o!hitislope and atluvial processes;inclvdes x —., Oiner Iaulls coAuvial tan depostts °5»= Shorefine anyle--Solid where we11 Cor�irained;double�oi da5p where Cpncealed; Laqdsl'�de depos�{!ipfoceie-?[Sisiocene "„���� doiled where erodeC;altisude shawn in metets �j 3^�ncarso6tlateG,poorfy sorfed boulders,cob0les. Q pepbles,sand si3=,and U�y derived Irom rock uni[s upsfop2 lYot a7i mapped IandsliCes are _�? ConiacS--�Oashed where approximate�y locaie6 or in�erred;queriea where unceriam shown;arcows inpiraFe da+nslope mqvemsni dveqion A4arine ierrace deposiE(Pp;noceneJ-�--Uncansolidated,we1F;o pooriy sorletl co�bles,pebhles, 'r� Sfrike and dip ol heddiqg � ar,d sand;clasts are typirrlfy subrounded 10 rounded:marine fassiis aM snetl fragmenis are . locally present �-- SyncGne—Showing i+ace ot arial suAaces and diretlion oF plunge OSdef alprvial de posil{PSe4Focene)—{lncansoliQaied io wel3�ansoiidated�bble5.pe5htes, f Anticline—Showing Uace of axia!surface and tlirecFion o!piunge �� of severat aes aardddeosied in IEuvial channehs,[laotlpldins,and�lfuvial fan5:incWdes aeposits - Gse o gQrehole—GS-�-U.S,GeoSogical Survey(unpuhlished data,G.Yates,Waier 9 posits mapped as Paso Robles Formation by Fiall e[al.,(t97g} T'4 Resource Division);M$a2-Califomia Department ot Waler Resources(1972); Tu Tertiary bedrock unditierentiated aitifude ot subsruface ol fermatEons shown cn meters • Borenoie---Compleied tlu�ng Shis sSudy rPns Squire Membar o(Pismo Formation jupper Pliocene}--.uassive,white to green metliurtr to -� �ExpforaFory oil well-�-�P[oducer,name ot weFi,and Sotai dep�h{siiefersJ are indicatad marse'9ramed saMstone(modified from NaIF et aL,197s} � r,,,n,,, �i9uelito Merr�her of Pisrra Fpnna[ion{lower PIiocene aM Miocene)—Broyvn ctays7one and Q � Ciosed aepression sittstona wiEh minar arroun[s oi snale,chert,and sar.as:one(modifiea trom Hatl e1 aF„i 57s) � Spring 'edna Memaer oi Pismo Formation fower P;incene and Y3��T.S �--� 7f2C5ChbpCdl�OR ' rmF"'' we�l-;ndurated,orange,bnwn,anE gray fine-to medium gan d'arkosic s nds�one�wrtinem3nory • yellow claystvne(motlified from liall et al.,�979} x Sedrock ex�osure AAorrtere Formafion Mioce�e y 'Tmm Y { )—Si!¢sione or cnen,dolomiiic�la stone ar sii1,some tuif ar�d opaline or cheriy snale arti sandstone(modi(ied Srom Haii,ei ai.,1973y Umil of rnappi�g r� Obispo�ormzlion(fower Miocene}—F�ne-la coarse-grained wni,e tutt or crystaiiine tuit and res�Stanl,siliU(etl,orzeoflized tuH,mela�oicanics,red.white,or green c}�rts, ra waGce Base map lrom U.S.GF.ofogical Surv2y 7.5-minuie 7opographic series, . (moaifsed trom Hafi,1973� 9 y Morro Bay Soulh,San Luis Oh�spo and Arroyo Gtande,NE quadrangles �ospe Formatbn4 4fi ocene y y Tn! { 9 }—Graen an�red rong�ameraie,sandslone and siR cia stone ;modified from Hall et aL,1979) rd DaciFe(Ofigocene�—?oryhyri;it-aphanqic daciie(nsodilied from kali e[al.,1979) ��f Frar�dscan Compiez{Cret3ceous lo.lurassic}—Und�lerentia;ed grayvracke,schist, � congfomerate,and metavolcanic r,cks K{�m�• Metavokzrics F:lJch Red,white ar green cherts wId Cvaywacke CSerpenFinite{Jurassic; , Na�e: Beclrock geology sirrplitied f:om Half{1g73)and Hall et al.i7g7S}. � V o GEOSOLUTIOHS, �NC, GEOtOG1C MAP FiGI]RE: � 220 H€GH STR�E� EXPLANAT10f�S ae SAf�!�UiS OBISPO, CA 934fl1 iR�sH Hius o�v�n�rrr pROJECT: {8Q5)543-8539 FAX:(805}543-2'171 san�uisas�sao,cx�or+h+v, s�o�321-2 ��.LAjH�b �;�j��1�.;,��3�r�,�`, .� .� ��- ;�A��,� / — - � �: ` ,` . �:, ,. r,. ` � �; i t 'J �• '• ' •• / �� .�: �F • ;' � ,��'� i�, �' ' : �'r.� . / `-�' �l .�.,�r�f� �,`� ' � .=C..` '�`I.��;� �- ;� �:a t '��-��y _ �'., � � 4 J�` ��`!r � ,: i;" � `� �' �;�fe r ef".�\ � �r"_��-',..1���.. 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' c 2�:: '�: ��3.}. � ..` ._':�,`.. �,` ,.y•.. �-� _ -��;�;, ti. }j z".�-.. _�•�,�`� � �tis '' :1. ;,�.....1;,�' • :\''••�. �!i �`/�j`� !":•}- 'u r: ,�-..::,,.�..�._' �y�+....�+....�t/� ` • �/ 1 �, 4 c �1( �, �` • . r-�.1,5• ��r ir�1��..' 6 � . _ !�• ��` rS7�r ' ; r��,k�,n�a ` )Y lV%'�f "r.=•�•= ,�;:-_�'i+'� ' 'ti �.. �;..�_ � :1 a�r �7 ��+"'a�`> j r- � t�r t\!�' .�• �. !-. •. � ,: • . -�� ,� �r . �ti. i �� ' �_Jl -•�'�� J �t �e ,./ /��'��..��s�� W�..._`'�. � :�� �`:.' ��� 's. :, .�rf `-�,r..' . „��� ,�,,.^�._ .a\ ,`7- ,f �:•••" , ��,..,F;>y,';":���,f l ��. .. �.�„�._� . �.;? �� i f � `1��' r'I :�ri�•���.✓ �.:^.. �� - •���..�,�ti:�,< `° _ 1._ '`a � �' �1 �J5 / �� i.S'llyy'�l o�J ..i.ist -�'i1 J �;V-. ... `�,�_'�.r 'i�; . �. �r' '�_/`'�, _ �.'��'= y 1 - $=��� \. ���:\; _ -%.-:�;�. r:�` \ i k' K. 4.� ..T r,��, i�"�;r�.� �_ \� ..1_ //'" �.7-�::`<:';' , .\`.,� �}��`.�F�,'•�.i- ;,r �� .:_c.�.t,�� /� .�� l'S„;�-- �''- ���\\�'•\-',; .ii�. •�ti l5fd..' �� _:=_�=3'<' � �ti1w � - �^�,� ���: '.s-..��. ~ .�»�... . _ i� �R.12 E, ,'rp�� � 'rhg d2'30" ��ag � l�q.... rr�r&MO BF.A CH7 i�:1 � �g:,+. !f NtN - � SCALE � , , � ��_ _.... --._.___... � �_���-�-�---� _ _._r ._._._.._.�:_. .�-:._�_._.-v----.--------_:.:-- -��- !S7qQ 0 5006 T;!�e ~7Ctl0 eOUrJ..._ `_5006 FI1b,� :CQG �fCi � - - ��. .�..-..-.. -- - =-r---�--"^'�-Y'—�.-7 � l .6 U.... i Y.ILOleESC� k�C"_�=3_L=CSI_�..._�__ --'-- �: ' ' COP3TUUR 4NTERVAL. 4C: F[�T � • �QTFFD I.INES REPRES�NT 20-FpDT CONTpUFS , � NA7iDNAL CEODETIC vERTICAL OA7UM OF 1929 �rom State of California Special Studies Zone Map, '1990 GE�SOLUTI�NS, INC. EARTHQUAKE FAULT ZONE MAP F{GIlRE: 220 H1GH STREET � aA SAN LU(S OBISPO, CA 93401 IRISH H1LlS b�VEIOpMENT PPx�c�9�GT: (805) 543-8539 �Ax: {aD.r7}543-Z'I7'I . SRM LL11S OBtSPO,CA�IFORMiA 5���3Z�-Z � ; MAi' EXP4.ANATI�N . . � Acti�e Faults . � F�ults cansidere.d ta have been active during Ho�ocene time and to fnave a �gQ,�c� ref�tively,high potet�tiai,far surface rupture; solid line whera accurately located, �-�,� long dash �where approximateiy �ocated, short dash where inferred, dotted . ---��.. v�rhere concealed; query �7) indicates'additional�uncertainty. EvFdence of histor- ' "•• •?• • ic offset indicated b?� year of eart�quake-associated avent or C far displace- . ment caused by creep. or possible creep. , 5pecial Studles Zone �oundarfes �Q l�hess ara delineated as straight-Iine.segments that connect encircled tt�rning points so as to defis�a specRal studi�es zone segments. �----0 Seaward projectios� af zone baundary. , � , . 'i ;'i. � � i � i i � � � GEOS�LUTIONS, (NC. FARTH(�UAKE FAULtZpNE MAP p�GUR�: . 220 NIGH STREET EXPLANATiONS 4B SAN LEJIS OBISPO, CA 93401 � d��i�,1�cT: /BU� 543-8539 �I11\, VU5 543-217� �RISHI��LLSOEVELOPMF.NT SL01321-2 1 � � � SAN LUI5 OBf5P0,CAk.IFORNIA � SW NE p� �p� 2Q` 30`� 40' 5Q' 6b' 7a' 8d' I I 1 { � I 1 I I � DARK BROWN S]L7 WITFi MiNOR GRAVELS � � ,�GRAVEL5 ANQ�-�. -. BRawN SANOY S�LT .,_. ........:.. . . . SAND,BEDDED.�.. - . ... ,��... .. - . ..... .. ..... . . .,..,:.:.. �.. ., � . : ..,..._•.:•. . �:- . _ .. . .. .. -. . . . .. . .., ..,. • - aH��ons� � -�� _ .. ... >. . ....�.: .... .. .....:- _ .. .. . , -- � , . . BROWN 51LT.MOiS�,DENSE flARK HROµ1N CLAY DARK 6ROWN CL4Y � TRENCH BOTTOM • NO FAULT[NG-NO CALlCHE,NO DISTURB�D BEb5 FiGURE: 5A �E�7S4LUT14NS, �NC. IRlSH HIL�S FAl1LTTRENCH �a1'��GH STREET SAN LUIS OBISPO, CAL�FORNIA JANIJARY 1'I,2ooa ;AN LlilS OBESPO, CA 934Q1 qR1ENTE�N64E sca�E��:�o 805)543-8539 FAX: {805)543-2171 51(1'LONG,AFPRqX[Iv1ATELY 5'W[�E AND 8RSE SL�1329-2 5W NE 80' g0' 3D0' ��IO' 12a` 13a' 140' 950' 1 I I [ f I I � �' � �ARK BRbWN SSLT WITH MtNOR GI�AVELS GRAVELS At�f� SAN�,$Eb�ED 9ROWN SAN�Y SIL7 _ '•;�=;•`,' - . AHD LOOSE DARf(9RQWN CL4Y ::ti.:� BROWN SILT,MOIST,O�NSE �ARK BROwN CLAY TRENCH BO'f'T'bM iV0 FAULT[NG-NO CALICH�,N� QlSTUf�BED BEDS 3EOSOLUTIONS, INC. [R15H �#lLLS FA�JLTTREiVC�f F]GUR�:SB 201�GH STREET 5AN LUfS OBlS�'0, CALIFORiV[A JANUARY'i1,2000 N A�f L�JES OBESPO, CA 9340� QR[EN7ED N60E SCALE='i:1� S05}543-8539 FAX: (805}543-2�71 . 5�0'LONG,APPROXIMATELY 5'Wf�E AND BASE SL01321-2 sw �� ��o� _ ��o� 170� �ao� �sa� zao° ��a� zzo� � � � � � � � � � � � flARK SROWH SILT WITH MIN4R GR.4VELS � CONT1f4UaU5 BROWN SANpY 51LT,lv101ST MARK�R BED,M1EQT OFFSE�f pARK BRQWN C1AY BROWN CLAYEY SILT,MO1ST GRqV�LS, SAND AND COSSLES �AftK SRQWN GLAY � BROWN 51LT 7RENCH BQTTQM NO FAULT[NG-NQ CA�lC�-IE,NO 01STL1RBED BEDS � �1GlJRE: 5C 3F�SOLUT�ONS, INC. IR4SH H[LLS �AULTTRENCF� '20�IGH STRE�T SAN LUIS 48lSP4, CALiFORNIA �wvua��r��,2aaa 3AN LU[S 061SP0, CA 93401 aR��Nr��r�soE SCAL�W1:90 B05}543-8539 FAX: (805) 543-217� - si o'�o�uG,APPf20XIMATELY 5'WIDE AN�BASE SLQ1321-2 � i ' � ` � z� '4 , � �����e ������� ��a���0����� 6��IY$F1�C�69 ���f��9'611� A37a Santa Fe �oad 5an Luis O�ispo, CA �3401 (B05) 544-3276 FAX(t305)544-i7a6 I ' (�cta�ea��,9, 1997 � I�II.,1�I�O.: �TCS IU709w0I ,i ; NTr.`�'ow Scoa�za . Sco�uo�Ialls�•oin '; 919 124t�Av�nue N,�., Suitc IOI �ellewe,WA 9$�55 � � � PnOr�!': L�AGLE I�AItD�VAItl3 AND CARDLN POnTI�N 4P LQ'I'6II � �C��O CAN�A D��,03 OSOS cot�r�o�sa►lv r�rns o��s�o, c�o� ' srr�r�c�r: �au�t scUay REF: 1) Proposal for Fault Study, Soils �gineerin� rnvesd�ation, and I'er�colat�on � Tests, Eagl�.I�a�•dware and Garden, by �arth Systerns Consultants I�o�hern Califomia.,dated ,�ugust 28, 1997. ! 2) Pa�ciflc Gas and Elect�ic, Diab�lo C�inyon Pawer Plant �ag Term Seis�aic Progxnm� Pacific Gas Sc �ectric Comp�ny (ZT.S. Govea-�m�t D�cumeat), 19$S. l Z7ear Mr. Scoiizo: � In acccorciance witl� yavr authorizadorr of tlie above-refenenced �aroposal, Yhis fault study Iias beeti �a�e�ared for us�Fn d�e development af pla.ns a�d speci6cations far the Eagle�ardware and Gai�n projecct, The purpose of d1e fault st��dy was to exptoee the peaposed buildin� anea and SO fset ; beyond die east and west buiiclia� bout�daries far ti�e g�reseiice af faulti��, `I1�e scope of our �e ; se�►zces�cI�d�d��cavat�ig a�73«foot Ion�by trer�cp 3�foot wide tren�h to a rnaximun� de,�tl� of 14 feet, 'The tc�uch was excava#ed wit�t a rubber tired backUoe. 'I°he trenc� was U�li�cl wid� on�site soiis, The m�encb bacl�ll soiLs were not compactcd. �� 'Tl�e tret�cl�e�pIor�on be�an on S�ptember I4, 1997 ae�d was campleteci ar� 5epGembe� I2, 1997. The�d of ttie t�encl�was appmxiYnately nart�i S7 de�es east,wluch is roughly e �rrdicular to ilie naappec3 tceqd of k�e Las 4sos fault. A detailed desc�iption of tl�e soilsPen�c.ourater�ed is � presented in Qie Treneh Pnofile�ttacl�ed with tl�i.s repoR. Tl�c appmxunate Iacatian of the tr�nch is • preseutea on�ie �'re��ch I ocatioa Map,aLsa attached, 'I�e trer�ch �enerally nev�d a sequebce af strati�ed soil wuts, `I1i� upper soIl consist�d of a re.ddish�ray to UlacI�sii�'cIay topsoil t�at w�.s underlain by �noliled daek yellawish brown clayey s�nd wiQi grav�I, 'I'hese urut� were underlaia by A a�eddisl� brown saty fine s�uid (alluvial deposits). 1� blacl� arganic rict�, silcy clay (�urie�d t�opsoll) soll underlies tl�e redclish browr� silty �ne saud. `�,e cant�ct betw�en the alluviai deposits and the buried topsoil units was �enerally �radatianal, 1�e intesIayeneci sa�dy allvvial deposits aud the c�yey l�aried topsoil umt saquence was repcatea nt Ieast twice in tkie tre�cl�, 'Ilte soil layers raaged in tluckness frocn 6 inches to 2 feet and we�e,for riie cnost part;cantanuous, unbroker�and f�orizoutal. i 17214 • f � f f ( �- � Ma�.Tom Scor��a 2 Octol�er 29, 1997 ' '�1�e soil units c�c�ibit s��cti�+es a�nnd confact rela�onsltii�s which su�gest tl�at they we�depasitec��,s � �11�avial "oveebaeil�° �lood pla� deposits by low ener�y curre�ts of tlie a�icesbral P�f�o C„�ek. Occasional buried�li�e,l,s were obseeyed which conssisPsd of uncoa�solidatecl, ligI�t brown sandy �i�avele '�`fiese clzar�nels we��e ofte�discontinuous arid ir��u.Iarly sIiaped. � A cha�caal samnle was cc�lI�ctecl at a depth oF 9,0 feet in the black siIty clay soil, app�bxi�nately 3 incl�es laelow tt�e contfl,ct between the re�disfi brown s�[y firie sand and t�ie 1}lac�c silty clay. The s�rnple was apo-datea �suzg tlze aoceier�te,� �nass spectx�ornetrj► {AMS) nnethod to measane ihe � n Caebon I4 contea�t� Ti�e msu�ts of t�ie AMS dating i�rdicatcd t�ie soii oiY�;inat,ecl a�pmxunat�ly 2,650 yea�s {�50 aaxs)Uefone present(T�olocene age). 11iis soil date genera�Iy co�rne�ates wi[h a y e soil date of 7ti516 beFo� �mee.Sent (f�olocene age) from the PCBcL Gtiesta Trenel� T 3 (PC&E, 1988). 'T��� PCBc� �each was locatecl soutf� of�os Osos Valley l�oad appro�ciinately 1.25 rQiles ( west of the sit�, in die saxne a�luvie.l valley. T1�e PG&E soil sample was taken at � appinximate deQtl�of 6 fe�t wher�dis�arict fault�ces of tlie�,os Qsos Fau�t were observed a��d ma�7pec1. CO�1CIlRSYOtlS � 'Thec� was no �hysical evidence in the subject trench diat would �suggest t�ie pre.sence of fatilting � within t�te proposed �iuildirt� �rea. Soil layees were genera]Iy horizontal, conrinuotis and unbeofcen. . Tfie fault fe�nu�es obserr►e,d �id rnap� by PC&E in the C�aesta'�nclt �'-3 displaced secIiments � believ�d to la� apFroxi�atelY 2,500 years old. Based upon t�z� soil age date of appeoxirnately 2,650 years collecc�i at 9.Q feet in dr�trencl� on the subject sitc,it is estimmated that die so3ls at d�e � bottorn of tt�e t�ches�c�v�ted on the subject site in t�e alluvial va�ey a� over 3,U40 ears oId. � Iit view of �te continuot�s and unbro�cen r,aa�didon of these soils, and that the age of the soiZs encount�red on tl�e sulaject sit� pr�ate the soils encaunt� by I��c�, it is co�icluded that die f��att feattuaes mapped by P(�8r�do not Pxtend i�to the aAne invesd�aYed, Based t�pon tlte above,w�az�oF the opinion that�to acdve faults cross or are within 50 fe�et of the � proposed bui�disig er�a 'T'l��t�efor�, baseci upon the cument level of�owIedge, the potendal for faultpeei�ted gr�und rup�tv eccur in die proposed buildin�am.as is coziside��cl �o L�e low, ( i We appm,viate the op�or�uniry to l�ave �rovided �servioe� for t��s project and loo� forwaaYl to wox�iax�g wii�s yQu agaui�Phe£uture. 7f the�e a� any c�uesdons canceening this re�ort, please do not hesitat�to concact�ie undersigned, � � Sincerely, � �rch Systems Consi�lta��ts No�hern � ,���E� G��� � �� Ro�.co o '� � riC����' �` � �n,� Richard T. Gorman, C.E.G � No.CEG 1325 � ; CERTIFIED I ENGliVEERING GEOLOGlBT Copy to; C,ent�aI C�st Eaginc�et-1ng,Att�enQoa: Dcn Maddalena ��` �`�' �in e 1 no�.rro.; 9�laa.�s.�,•rivaw ��Fa� �AtIF�4� � 17215 � . � � ���� �����Jl.�� i@/1E�� JU���JL'� � d . � 4 Y ' . �or�xxorr o�r�r�a,�iAav�o cArr�����as osas � . ILos QSos�J'�Iey Itoad � . . San L.e�is Obis�o County,Cali#'ornia �' . . . . � � � . � Qa �o� o�o� ��Lt,�Y ���e . � � . oa .. ao� �a o0 I i � 1 l�44 1 1YfY�'/ �1(,��✓�/ , ' �urr.�r�v� �ur�rt��a I � � � , , , � � ��Zop�� ���'fY f.I� � p�p05�b ����frJC� �}�A� � , , i . � i . . p�.o�a��b ����,n�r�� °° �0 I . � , 3 E ' O V • 7'�I � oa . . �,��E� � � Loca�ion of Trench ��,�� .�,pi , , . �+aI��l �ystCms �01[LLSIII��'itS �378 Santa Fc Road,Sau T.uis OUlspa CA 93�t01 � � N9i'�'��'�4� (805}544-3276 (8U5}5441786 FAX Octat}cr 2A, 1997 FC NGS10709-�I APPENDIX G.3 Preliminary Soils Engineering Report 17217 This Page Intentionally Left Blank. 17218 t �X � ; � - re .�;5 — ~�� `►�� �� �� �`r ,,► `;.. y''.��- �I �'` -_ Yf ',' y ��". P '� � .i ,'��� Y h a � ���r�;�•1 i. 'r '+`�',1 . � !P' � r'+- f � - _ ��f - �� _ . .'j5 � � _ j•'.� .� .'�`- � , - r. f :i• � ' ' .`�l' _-- - �,��-(I�'��•a 'v, r:.,. r r - fI� ~� •� ` -. �, . `\ — ' � t,i� a `; ', �` .. . �,- ''�' �' ` ,f - ' �,;�� .■ t - al' .1� 4 'j ;• , . � " F'+ �r • �� �. �� 7` �-.�� � r�' _ . � , ,1'� i - ,�yh`,`� ;� :`,�i. .f �i �� � ,' ��' �� -•�` �{•�x '�' Y:u�J�i�,i� � . I . ", � y`,r. � . . Z' �.1� * ' . I 4 � `' �+ ' . s��� f � .� ` . . * ,�.�..: �ro, .T` . ,r�, •�•� h ',;y�,. -�y .�y. t. .i�"+ . ,I � . I \,1+��'�i Ian��i . ,A�,�� C YI t r}�R � ��- 1�5- 1. �•` •ti '�. ,L�� � . - . �.� �IH f'' 4 . .y,,: r� __ 71��� 'y, �� ' _ �' � ' - . � �` '�'r�f ' � '�T.:,� , ��i�t' -{l ' . -, ��_ , •l.'{ �;�'- + +� , -' ,� , . . - . I.; , PIZT'LTM[N.41J�'Y �[}TLS ENG�N��'RIN� R�PORT` �� ',ti I+'It��M/�l VILL1-�GC[O �1'E!GII='dC' PLAI� ' �- - �-�j�:_�� AYl�: O6'1-2d1-Q3�, 031, �:�ImI �,U1� OBI�PO .4I2.�A . ,;,.. : �AN LUIS ��3I,5P0 �OL(NTY, CA.LIr(�l�tNif1 .,: , r�:� --:--�� �"'-. � } ��. _ ;u� i� .,,kr-• , P1�OJLCT �L0973�-1 u'�. ,� � ` - =r „'.,. � �� � ~' ,;� ;� -?�'' �su{;µ��.�i�s !:�'Y f� �f�.,�r4� r������..�:,�. i: ,.�V���- +..�' rt'� �' i-�, , ."�Yr��- `��;-'�. '�1�,,.S � ,'� J ` �'•' .� "?, J� "���X.� 5 ��7'�- �-i:�, � r�'-����_. �� �� ,� - � , � r � �;7„'- ��. �� .� ' ~T��C� _ '``�T .� ? R� , I "�a:� ,.?: fr. I I'u . � } '� � - y - - _ ='��r-; �����' 'r' i�' : � ,�.. `T}�f��� � r, �r��._ .. �- '��� �. 5, +]'_ - f i �-_ , � �+ r .,�1 � � . �� -+��. ! 1 . t._ . ;, � ;f��'rl�';' .,,�����;�-4*?�*T��"��w�l�- , Frepared for � , Maciaoysia rruom �Za�icli , Clo IVlaciou�ia Co�s#3•uctian Can�.pat�y � Posl:Of�ce I3ox 3914 , ,� ��>�.�� :. � � � w t,�`.�- ` as'�,`'-�;`�';� S�n Ltiis Qk��spc�, Califoi'nia 93�41 " ` 4'^�fi�Y� ` �- -Y��f'��r-^�:�r.. . �:'. � `_�� _ � y���ti'�,*. .� , `x j �f ��.��'� 's� �� t •1 �+� - .� � � . i.. � . ; - '].yr�- -i-ti� . - . �. . � �• �Y� i � '-� =t ,1s �' � . � _.� i i,=.i� 1~�sG .�f `r ��"�:�� :,,` _ ' � . _� J ' ~�F"-/.� ` Y��' -� • ��� `� � �. - . , , . , .-�;. � � . �! „ - .,� . �,.�_, _,�- _ �,,_ _;r;�_ :� �� _- - . � •�'�'•^r I�t k'- �I � �{I,Iitl� � _ -- .•�+�}�{� 'L�I� ■ �'f'- �I l �C?'I��� . _ �, ' �. _ �f1L����`�r:�j�k� - _ s�'�PpZi'� '� } .1 u :��,�i�:� � ' I r."_ . - . .-� -, .. - _ - _ - - �+�. ,. � •,' I`n � � Pre paredby � , �SOLUTIONS ' 220 HIGH STREET 'I SAN LUIS OBISPO, CALIFORNIA 93�401 (805} 543-8539 I i ! � i O j I J«��e 28, 20[6 i � •� �,r:� ti rll, ��j}!�i'[' �'rti.'--",�:t' .. �K�. ... . . " :,.N`r:_ Iy-.: - ` ,� . .. ."�.- —,�5+1�:1'_:�.;+� r� + l{'.��vji�;;' � � �� ���'�:-`':_�s, ; �� G?.r „ ;•�ta-'7,}��.�:f�` 17219 � ►�..4w��';-v'2�"�{�.F'. I �"J � 5� t �. R� h � � 'yr-/ ��.f l +�..�y,+.�f�.7y{�,•• 4 —�' . . . . . __— �. __ .—_ _� _ .� 1l��_.�.��?���L.'1s--'�'�1 J .r'�3_ � l.•/'� .4.. � J •,! _If_. I -� o5alutians �Nc. Ce , ��t iam Laae,Suite 105, Santa Maria,� 2 U I I i g� ee � d, G� 'sp � � G �8�614 (805}614-6322 fax (805)543-8539,(805}543-2L71 fax ,4,,��nf��@geosoLiitions info cr geosolutions.net �une 28, (�16 Pro��ctNa. ��.4}9 1 Madomia Froam R.anc�t c/o Madonna Canstcuctivn Cvmpany Past OfficeBox 3410 San Luis Obispa, �alifarni 934a I S�b ject: P�•eliminary Soi[s Engineering Report Ft�oom/El Viilaggio �pgc �lan APNs: OG7-24[-030 and -a31 Sa�Luis �i area, Sau Luis Ob�spo County, Ca[if ornla Dear Mr. Madonna.: This pre�iminary �oil �ngineerin Repart has beeu prepaced f oe ph proposed t���reent to be ��e ferred to asthe �raom El Villaggio Specifc �'lan [acated on API� Paccels OG7-241-030 and -031, ii� � San Luis Obispo area, 5an �,uis � County, Calif��rnia. �eatechnicall the site is �itable forthe p�lp �b pment �rav �h � in t�is ��po are �d �nto the� � is � � �d �d k�vil be donste�cte far a�g`a af� p�sed �� pinat d �at 6t[a {N be �port �a � I� � on � sub-surface �est in the �pe �p pa►�tions 6 the � � is � t�at the�ro�ndat fo atlte ii �i area[�vi be 6�av � �t �� �pe el foatings �a be [}��ed n some acea b �a! gE the i[�iim � nto � �ent �br iona[ �ial A1L � � b be elacat � l�for �rteria� to [imit the �� fo �l¢s of the f aundati g�ehs due d �'ker � IF cuts �eper �ha �Sl � �t of �[if o ��szt Saf ety Orders �r �'i��, �nc�►e �h are p��� a n� slope �ab tl,�'r �a s �►ay b �cessac far� rat� d�t � Trtlaz�l.yau fc�r the opporhinity to have beeEl of service in pi•eparing this re�ort. If you l�ave auy c�uesi�ions or rec�uire 4sdditional assista3�ce, plc�se feel frce to cantact the fuiciersigneci al(805} �43-8534. , ��� � •�. S�lcerely, ' ' �:i..,;r L.;�L,�:��;;'���� GeoSoI��tia s,`Iyzc. `�,��� {����} , - ,, .C;13G1 '`�����/��3 J,� r� �,_ [�raig [�. Ci�ozie�•, LE r. r 1... r �g G136 _ •i� 1 _ ��f.•� Princi.pal, C :'�.. _,_: .. �, ;;- 1... . :(,it-;,;�, .�r `` - , _- 17220 f'room/El Villaggio Speoific PIaR June 2R,2016 _ Pro'ect No. 6L0973�}- TABLG �F CONT�NTS 1.0 �TTRODUCTION,.,,,.,_„-��-�--�--._.,....,..,..,..,...,...,..--�-��--�--,_„,,,,,,,,,,,,,,,,,,�--�--�--.._.._._..,_„_,..,,.,.,,,,,,,,,,. 1 1.1 Site Description,,.,,,._,._..-�--�--._.._.._,,,.,,,,,,,,,,,,,,-��-��----�--._.._,._,..,,.,,,,,,.,-�--�--�--�--�--�--._.._„_,._,,.. i l2 �ject �escriptio . .... .... .... �...,r..... .. ......... .._....... ........ ....... 1 2.0 PURPOSE AND SCOPE ,........... ................. .. .............. ....... ........ ........... ....... ....... .. 2 3.0 i'IELD AND LABORATORY�VESTIGAT ........ 2 4.Q H�"{�T1�OIL GAOUP ,.,.,,.,,.,,.,,-„--�--�--�--�--�--�--,,.,,,,.,..,,.,,.,,-•--�--�-��--�--�,,,,,,,,,,,,,,,,,,,,,,,,,,,,,5 5.0 SEISMfC DESIGN CONSIDERATIONS,,,,,,,,,,,,,,,,,,,,,,,�--._,..,..,..,.,,.,,.,,.,,..,,.,,.,-�--��--�-�--�--,..,..,..,..6 4.1 Seismic Hazard fLnaIysis-�--�................................„-�--�--._.._.._,,.,..,..,..,,..,.,,.,,.,,.,,.,--�--�--�--�--�-� 4.2 �tructura �ui �s Parametecs--�--�..............................•�--�--�--�--�--,_,,..,.,,.,,.,,.,,.,,.,,.,,7 4.3 Liquefactior►�lotent .._..-�--�--�,,,,,,,,,,,,,,,,,,,,,,,,,,,,,•�----�--�--.....,..,..,,.,,.,,.,,.,,.,,.,,...-�--�--�--�--�--.& 6.0 GENERAL�[_.-FOUNDAT DISCUSS�ON.._.,_,._...,..,.,,..,.,,.,,.,,-.--.--.--.--.--._.........................8 7.0 CONCLUS ONS AND RECOMMENDATIaNS.. ..... ........ ...... ... ..... ..... .......... ... ........ 9 7.1 �`e �teparat �o BLii ding Aceas........ ..... ... ........ . ... ......:......... ............. 9 7.2 Preparation of Paved Aeeas ............... .. ....... .... . .. ... ...... .. .._,....... ..... 11 7.3 Pavement�es .................. ._.._.... 12 �. �r►al � �tiati ...... ....... .. ._........ ..... ... .. ... ......... .. 13 � 1VIa � s►dati ...... .... .......... ... .... ................... ........ ...... 6 � S� OdgG�•a C� ruction ._ ...... .. ......... ....... ....... ..... . ............. .. 15 7 � 9�te �vo ........ .. ......... ... .. ........... ..... .. ........ V $ Ret� 6�J ...... ... ......... ... ..... ............ .._..... .. ................ ... ....... � �1 ��DIT �� SERVICES.,,-�--�--�--�,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,�--�--�--�--�--�--�----.,_,.B � �II�NS �[D �IF' � �IT ....... ..... .... ........ ...,.... 21 ftEFERENCES �END A �' IRvestigatian 5aif C[assi�ication Char[ Soring Logs TreRch Lags 17221 C�eaSolutions.��ue. Hibom �'illaggi Specific Pla❑ ,fune 28,_2016 _ _ I'roject Nv. SL09734-l APPENDIX B LabvratveyTcsting Soil Test�eports APPENDIXC USGS Design Map �umma Report USGS Design Map I.?etailcd Report �PPENI3IX D Prefimii�aiy Grading Spccifications Kcyand Bench 4�itli Backdrain ���T or r�GURrs Figure1: SiteLacatianMaP-�,,,,,,,,,,,,,,,,,,,,„_„-�--�--�--�--�--,.,,.,,..,.,,_,,,,._.._..-�--�--•--,_.,.,,..,,,,..,,.,,..._.._..-�--�--�--,.,,. 1 �u►`e 2: Site Plan ,,,,.,,.._„_.._.._..--�--�,,,,,,,,,,,,,,,,,,,,�--._..__._.._.._.,_,..,,.,,.,,_.,.,_..--�--�--�--�--._.._.,.,,,,,,.,,.,,., �-��--�--�-�-3 �u�•e 3: Regianal Geologic Map._.. �..... ...... .,....�..,. �.4,.... Figure4; Hydrolagic Soil Group--��-�--�---�--,....,,.,,,,,,,,,,,,,,-�--�--�--�--�--...,.,..,,.,,.,,..,.,,_„-�--�--��----..__,_.,..,.,,.,..,,.,,,6 Figu►•e S: Sub-Slab Detail.,,.,,,.,,,.,.,--�--�--�--„.....................................................................�--�--�--,._.,.,..,...,,,., 11 Figure 6; S�tback Dimensions --Slope Gradients Between 3-to-1 ar�d 1-to-1 ............................. ..... 15 F�gu�•e 7: �etainin Wall Detail................... .... ,...w.,.. ,,,.,,... .............. 18 Figu►`e 8: Ret�aining Waii Active and�ssi Wedges.._.... �.......,....................... 18 LIST OF TAI3L�5 Table 1: ��ring Prope��ties ................ ....,.,., ............................. . ,....... ..�...,.. ........... 5 TabLe 2: Minimum �'aating and Grade Beam Dimensian.s .......... ........• ,,,.,..�., 13 Tabie 3, Faundatian Laleral Resistance ParatneCers,......k.,.. ......... .... 14 �b 4 �um 6b �ecom �tf ons �,......... ,..._.,.•........................ 16 i�ab S: �aa.g �I �es �e s .....—.....,. ........ .......... ........... .........• .............. � �`abl 6: Re�ired �i ion and �e � �i ,,,,,,,,,,,,,,,,,,,�-�--.._.._.__,_.,..,.,,..,.,,,.,,.,,.,,.,,......-�--�--�-� 17222 GB[]SaILIt�Of1S�IN[. PIA�I�IMI SOILS �NGIN��RING REPORT FROOM/CL VILLAGGIO SPECIFIC PLAN APN:Q67-2�41-030, 031, SAN LUIS 013ISP0 AREA SAN LUIS OBISPO COUNTY, CALIFORNIA PRpJECT SL09734-1 � �N�ruanucT�oN 1'liis pre[iminary report presents : , �. m�o usn�a �11 results of the geotechnica[ .r �E���€�( � �3�' � � ;r �i� investig�tion For the propased I�� . s. �.�1��� '���•�., F�"�„�fr��4E.�, ; ' ) � t .-. .�'" r-.. k} t�ent to be bcated on the �:� ,� r��`�`I Y�, �I' �•�, , �°` ��I' , � ( � . �,. �R�4o\ � ti, � S� �f ;��po s�u������1 ��`� � �oi '--Pa � r� e� E•ef e��red ta as F��oo�n/El � � � ��n �-, � P P �3' ��: . ' , � �p°. (°�:,��:�.%;, ,>.��1;�� '�.;� Viilag�io Specifc Plan �t.�d , � ����,',,�A ��`� r ;I - , . � t..:,.,_� ���, ,. on A!'N Yarcels 067-241-030 ,1�. . , ,f `g,,� �"� _�L aad -03 � in �ll San Luis �bi `. ,i�"� `��� \ x9 35.248050,-i24 686144= ' -�v. ��3 �1 ' � ., : av +� ,f-4�..fntro ue �rea S�n Luis �i Ca�lnty, �.t. ,�` �� f,.; �1, o , L., �1� ��lifornia See Fi �lE•e 1: Site '� 1 � � ��� I ? ~ ( �•..-� � =� o' � • � '}11 \' )�I�,: `� ,� �c p��J Lacatian Map f at the genera[ �ti',,� ,, ,1� ,1 'iN��(� �r��� �'�; ' 'i� �'` i �i LOGitCIOTI af the pro fect area. � , ` , p,.� ,, { '� ° --� �.: � I _ , � ��ii �`�i� Figure l: Site Locatian Map was �`- '���' r�.;` �`�_ � ,i 3` � O5��;� 6� �•_ , � l���'�i I C 1 1� ,� inr'}t'� - o�y��in�d fra�n the ca�n �ltec . ' f�<, � �J ,� �r �� �;,� _. " program T�pa US� � 8.0 _ - ��1��'�; _ - `,;: �i�� . �'fr;: ,9�,�� �����;� 4 .. ; ► ���_ 1 ,��-;.�' ��' ��� �� .,�� � �'1 (DeLarme 2009}. � { �.r�~ i �I ,4�41 l '�/ I f 3 ,,� I aatau��,nn�lno«a¢e ._ ,� 1,! �ite Desc�•i�tio�i_ °'°°�'.ea ry�", "� �_� — Y�"KtlA]mac[fll C�oZoO 1}1 Etoo�n Vil�aggia Specific P�an ��• �: � Lootion � � �c in the �ne �ity of 35.248050 degrees noith �td � i�. � �s west � at an ��1t�,x �era elevat�cr�t between 110 b f�0 �et �ba mean sea level. The pcoperty is �aE• in �a and � 1 39 acres i�t size. The site is hded by �.a � V�e �ad to the noi�th-east,� �ne � /:I' Maxx devef�pment to tl�e Ef�bi west, a �i�mbin af d elopment and p �ce � the so#ii �l � i�s Hills Naritral Reserve pen �pac ta the �t. ffe neatest � intersection is �rh �i. � Va�ey �t�ad intersects Higl�way 10 L a���xim 60 f eetfiia 6�n the mast easteE•ly po�rtion$ the�ropec�ty The Site is �aracterized � �k to �lli �rass[an with an e�tin �ia l�s whiclt � ta a�tee racky hill at the westerly edge 6 � �oper i�n � the �ish C� P�iat�i Rpe The �ife � cu�•re�ttly�a�l with few�nch buildings aln undev�ped �mon mast of the ��� 6 � site u�i 6 a�ii� �ra in�, t�1 n�ia[ �s shc�ibs � a f�se �s cu �ntl ve�tat h� �• Bu �aiii age�enec•all fa[laws the�pag tawaE•d the �as i.2 Y�•vjecr.irlcscri�r �'h psa� �p s b inclde the va st��ctian � �,i rQkidenti �d �o�nmeccia d�pm �h �ol stcu �u are anticipated ta be danstcucte gsiii �t wood �in a� 1� �t �� � urai �tee ��'o p�rapet ebt �h•ea ec be refeat•ed ta asthe�ite See Fg�IE•e Z: f� Plan f arthe�eneE• laqut af the Site lt 's e�a�ted � �ie p�sed �t� ctutes �ill uti[i s�}•ed- �t So systeins. �d � �u a[ned kre � er �rr �l y u[�aN'n , b�lt �e ace anticipated to be �ete � � 17223 �roontlFl �gio ��c I�la dun _28, e16 - -- @t�l No._�L0973 .. continuous footing a�id lu�nn �oad es�Ii3aa� to b approYEmateiy 2.5 �.ip p linear Cootand 25 �.ips ��• � �ux�o�� ANo scoP� �'he �ir�o of this Gudy was ta exp[o�'e and �aluate �1 sut'face a«d ab-s�ieface soii coildit�ons at tl�e � and �o de�e�op �t�� infarmation and �esE �iteria. fI'e scope of tft�s st�idy incl�ldes t�le follow�ng �n I A Iiteatuce e�iew af avai�ab�e ��dbli a«d un�ublEs�1ed �t�icaf data pertinent to ttle p��oject� including geologic maps, a�id available ��- oe iil-f�oilse aer�al photograplls 2. A field study consisling af site reco««a�ssa�ice a�id s�bsurface eYploratEon E11C1LlC�Lllg eX�]lOI'at01'y borings in ed ta ftm � a ��c: 6 tfie ��►be cond�t�ons at t{le �e. ; � t� perf efi an e�e�1tatEve soil pp�es �tiat we ��cted during our k�d �dy �F Engineer�ng analy is af� da � ti�'�ng ��• �ra �v�ew �I � ud� and �a�ato y testilg 5 De�e�p �n 6 � io�1s f o�' g �e alld g�din as �FL � p��t g�hte design �ria �o bLlELC�lllg �oiindat�ons �tai�lin wa�i � el�t sections, �t�.ind �es d« drai►lage fac�l�tEes. 3A FIELD AI�TD LA,BORATORY INV�STIGA,TION f�'e � �stig sva �ld� oll �1 18 & �9 2Q16 �i a Mobiie � li���'ig l�'i'ee �fi diaale � Li�i gs �re advailcd to a��Y dep�h of 10 feet��r �u►ld siirface�bg nd oe �iei d's1�er I�p �' was sdva ced �o a�um depth o�46 feetbloW �jLlllC� �race �bg � �h ap�rox to�� �d a�1 I'C� 2: �e �n. �nplin �hho�s �hclude the � andard ��tian �'s �►tilizig a �t nda�'d sp<<t-spaon sasnple�' �P witho�it 1�ers and a �i � �tnp! (CA) t�it �rt The Mab<<e �4 �i tg � eqipped e� a � �lasnme�' w��icft � n Et E[1CY 6 �i 60 pe�'ce�1t and �v �d ta ubta test � co�iilts in thefo�•�n of N- ga�ue � t�na �ati ass caIlducted on �ii�e 7, D16 �� a t�ac oe a�id �Ycavato Sve�i �ri[ trb�s ev adt� ced b a ptiim d of�5 feet�lo ga�o �ace � at the app�ma �Qat �ica on I'ig�ie 2 �e ��1. Sampling �et��od inGfade� �lk �gs. Z 17224 ��05[�l�t�ons,�Nt. Cfovml N�agg ���'lan �un 2R. R}I _ Project No. �L.49734 � � - � � TS � �>: � 1( ��� - ����'�, .��.�" ��>:��� ,r` �,�:��.� 'i� �4,..3�- �.y �_ � ' C, S f /� f � -w � . , '� �'�� �� � , .. � ' f ��� f' -. � ' ;.. , f � ��1 i. — i . � � .� � '.;;` � r 1r j�� ;,�!s�-.,. .' f � �.. .��t , - ��'\s`� , ' . J. � ;w p 4,`� t , , ,� - �. �E .�„p,. _ �` . <,>. � '�..�� � i i r `�, i �� � � . _ •y' �� � �,� , ,�``\t: , 1. .q�,� �� ` ;,S� .* � �� �F �� �, r , . � �� _y�l��`. 'Y�+3� .l..���- °'��°� ��'.� t.b 'I:�:;J�j�)3r�1� rr''`l r� . ' p�' . D'1 , J�a;.�./!� ! rt_,i �a�7�rT;�(slT�i;l�' f ' ��.. �.; ]P a�i .,iy J �fi+ ;�' ' . _" . �'�: r.� + [�-3.,�f�7 �ff � h�� . ;r{- � 2 r� ��+ ' r � � r 5� - �t - ,C �1-7 m '�k ' �� �x �� i r�� � , , s?r,�(J ', _ ,� S S F;,�r����'�'�t��1f�;y;��� �..,��I� = � � ' ,i 1 y r �'= '�j. }' ��� �� 1'J��.�_ i � � _r� ��3 � � i r ��- j�il��^!r'c.�.;.�S J 7�"�' � . i ; � ,r� � . ,� ��� �- ���;f u� � ,� �. � � � ��N � ' . �, n.f�� ' �>>���f�`.�f'� �{;� l � ' ` f��af ��p� r - , f ,� '1� � .,�. :i'�� l IT 6 : t 7r r � � �, ! `�` � �!� ' ���� . �'� R ��,� . ��-u� �f � �.� "1 }7 �p �i�'�r, i r�•�4 ��!� � � t', �' r�. i 3 �� ��f� :`�- .� ..�;,T'-� r �1 �,- . F 4 �1 �, 1����z.�-.. y���,� , , .x , �:ti}P ��'. � ; - 9r" ; � T 3� tr�' .,"Y ?, j� u ''_,� ��" ��'�.. � •"?4 J4'`` k ��s" �! � 'ti� �zi r ( . � �u � ' � �)� . ��� _- - -� �-a.:_, S :� �Jf hI.:..,� � -�-�.�r `� ' .�� � .��12� �II���,J�` i � 4: rI :!� i " �s':.�,�.`� � ..P ._ R:+-C . , " �- �^ - ,�� � '�!� � � �. � .� ���,Z,i'`� C'Y �',. - ,�'� � i� r � j� i'�'r�a {�i4� , �� ' � , , � 2 . •,� � «��!. ��y!�'�: 1� [3 .. i � 1 . '�� �yY+ , i.i:�M�C �� SI� '. , � �`�� ��' � _..'��'F'�j,�, + - ,.� `, ! �,� � �1� ?-=___ , ■f ���, �, � 60R1NG LOCA�IONS � • � ��-TitGNCi-�IiYG L�CAT�O�IS � �7 � ~��,? . ' , / } 'z,� NORTH �iu•e 2 �c Ru Data gatherecf duc'ing tk�e fie�d investigatian suggest that the sail n zatecials at tlle Site cons�st Qf a[luv�af �il �rly campatent fa��matianalmat�rial, The deptll to competent��afnat� mater�af �ci across the �e, ina'easing in depth towards Los Osos Valley Road ta amaximunn deptll of approximately 50 feet�g The surfacematerial at the Sit� g�n�rally consisted af dacl< g��ay to dacl< grayish beown sandy FAT CLAY (CH} encauntered in a saft ta stiff and maistta wet co�dit�an to tecmination depth af E�or�ngs B�-B4 and daek reddish brawn sandy CLAY(CL) ��caunte �n a�r to �tst ❑onditio to an� �v� af 2.a to 8.0 Ee �s ��r � �t form�i ona� �mate m �n Tl�I` �ion �e ��y was �x ned � atg tl�.e GeologzcMapoft7�e Pisrazo Beac17 Qacad��af�g�e�D�lee zaa�� �[ tk�e � � e b: �pL icatbn (USGS, 2013); the later appf�cation s �i�aila �n�o tlle � � �l St�ey �e �EJ 2013) and Qom �e �t g geolog� � �`h �na�ocity 6 a€€ �► m�rla at tlle Site was �hp � Surficial A�uvia� �i e�t �S � �'rnzatia and �tinite which �tv Cterea er � �farr to as �vp ��atia al t�aial f�a[low ground water was encountered bet�veen the depths of 1.5 to 4.0 f�eet, �houg it sl�it b p�ted tl�.at g�iwater �vat�on � �ry �eeasar�all � �v �nigati pcactices See Fi�ure 3; Regianal �# � �• 3 17225 G�o5alut�or�s,�N� Fraocn El Vf�gg F�c Nlan 7une 28, Fd0 _ i�icct No �L0973 -1 PISMO gE MAP (212} Q� oa f. l ���, ii r , �„ �f: ��� N (;-� ,',1 . ��,-�I,` ., � � 4b �, ._ , ��, r� � < r -{ � I� • a a�v�"�sr��iaorreneuncnannas E •�.�,�04� S � � ,,M ..-,• . � �� '. ��r f1Gl� � � 5 . ���4f'i. � •-�,� ' 1 Q�� 1 / 1r �rG thil� u? ' � ' +:ir/ .. � ��� ��.�.-- � ,'1� 1 ��,�•••.1••"- CQASTRANG8Dt1 COhIPC3l7f :i4!hd,Jf:,��}Sj��,`,'Tl�� ��• p�h Char�tle[¢MP Nph prey,matnW� ;f�, � ''.tlij�•.........:....i � nh 6esaMdiabaee,lYedr.6ne�relned �.�e ' v.. ,�� t�'ii�i �1=. ,f 1��11���1��Y�'� �II j ��1 �� ,�, —��� �. i� .I � \`' / �'�\ y4�uB��r� ����� •�,•' � , i�r --_��`�ih,G ' ■i I •`� '' r '�`��. ^ µ.=� �I��„,' I $GKPEN71N6 J�.r��� � ' � '-. r`.��1J Meil.�ni�r,\1i�iit+-.M�1 � filxr-arrriFckrd,�xlia�frArns arirvrarpho�erlj peK�PoKrcm�r be�rt ¢ ' . _ -. f� �q�r+. ,� .� Cvns Hrsgr Rplfft firvmp ,.'� �� u f,.h. ,�.� �� - '+ �'i'I'p. +I I I� ,. . ��-I �•1� � -1 . I � ��� �I71 � ' . � - . . �� ��� ���� .i! f I � � fHAKUSCAN ISflCNS �'�'�� �. : � , .7�f7 {�O� 4f��rv.��Aru�prdln�i�dliwrntarywadrolranftnvl.;.�r.�unr.�IcanJCnlur.w� " i ` � hll MrwsJxVj shwrod mef�po.P�lu'r�r rl�M cl,yiNno m#g++Y�s�aNd�ldM . IiI1�� � v,IQBfl�� � Fl1CMR11ZUNiSOIQrTMa�AONn'/{�'![R1hY:DMldp'•WCdGy�M�CA��1f � . . I �s+`7'�� . 1 � I ._ rQQ/P�JhYq(TG�Y-G�l9R) . jI ' _- I:�. '_. y">4',' iil . . �;_:I ;' :,:� — /�1= , GEQLOGCC SYMAOLS ' . .. y:�dyrdae�dwmm�xtim�y f0[1�1ATIC1tV CON�`AC7 M�h1IIL'R CON'iACT CON'CAC'I'F�FTWFi±N ��>naUvr��vnlnlrm�dwmRe.tieY+ Hati+�m�'��oleW�innnai tiLiRiZCIA1.5F�11A7f��[5 NN:li+M�romten'nJ Prnmin�nl6�d ✓-a�cimyti..,.,r:.r_,i.�r�,_.-� �+ �i���.T:UaN��Y niu�a rtd0!�o a�ut'rcrnd,rFtlfOtf nfidhf eA'ICilR1EA. �V �•zaoaa pu��7<�Iwlrer.•��I�«rNriiWtlBfAdPpIM1^llpelV��f��t'M[o1Mun�.l y � � IC�kI��'9LG�INii�lnp.l'm��ZRC4]f1iV1t^fIRV1fA05T.lf10I11��fh4Xllb'/ ��4j,�,'te,�. Z o �i����.Ei117fU-iaxll�ronnide.P-daanNvq.ne;dels'nartannNlndrn[ei O _ � �-t�-- .. ' -- - — Ayorldullp;m�v.S.rnIJ4lholualUf.pulpfillJoffONal�9'YIl�r�Sf�'+�1� 0 1tltlt1 Y000 �a �DOa 5000 9C9Q T� FEET � �•~�, . .. � �- --�- :� —,s o -- ��K��o�u�r�n �O !lxncr.nvs 9rna� rrs .-- --, _� -, . i �-- — � erro�rw,em�umabbv�aranecxecuorrwpw�oarsocwnerecwieaswaerrueecw umm�nts 5�rf.keanddf.FO -�e �{� �-s' � -F Sedlme3nlaryrocks ^�'a f� °""irtp° � � \`ORTI� Slrlke ernafi pvfinetQnwrplr�c _sm � � -�"0 orfgneousradrlGlarlanarffow � 'm*d � �RR° bar�dingorcanno irionelryip� �""m'""} orEiaR sYn+ao�s: �a ° � «�,.��.,�.. ���. ,k„��,�w �«M. a�. F�r 3: �i hn Ge� ie �4`Ia During th bo�'ing �peration the sai[ encauntered were continuo��sly �xamined vi�all �lassi�ed anc� sampled �o general laboratory testing. A pt•oject e�g�n has ��aewe ntinuous lag of the soils dncountere at the ti�ne of �eld i�ivestigatiott. 5ee Appeudix A fae the Baring Logs fi�om t��e field �nvestigatia�l �t�(sory �sts were ��3rtrted on aail sampl that were obtained ft`om tlie Site c�uring the ���d �eti. The results of fi�e �sts at•e lis� belaw in Tabie 1: Engineering Praperties. Laboratory c�ata repo€�ts and detaild ��iphd�s� of the �borator tests perfoemed�uri�i �LZi i�r�stigatia�i are p�•avided in Appendix B. 4 17226 ��o5olut�or�s in��. �loa �fgi �p Pl�n �un � 2Di6 L'roje 8�f �4l9 �1� 1: �t• @� -—- 'T - - � � 'r � :� ,� �+ 'vC o� •� y� •� ;� r, � e � r� ca � � C� nA v, � � ,� a 0 I � Sample DescripYion �" � a• °+�' ; � c � a '� � �a � c c ,� �- �" � � � � e� �. o o w„ C �' o w c„ i y vi 'v� '�, a o p � � �w � � °' y a � V � � n� u � `��' v � � � � � � w r� d w � a� � c� av` � A Very Ba��lc Grayish Brawn CII la7 High - - 3l 79,6 - - �a 1.a' Sandy FAT CLAY �' Daric G��ay FAT CLAY CH l86 Very High - - 48 g4. - - B-3 �1.0' C Daric Reddish Brown 5a��dy CL 79 Medium - - - � - � T-2@2.D' CLAY �-�@S.a' Veey Dark�rayi Brown CL - - 28.7 lla - - Q.165 a.a« Sa��dy CLE1Y . � 4.0 HYDROLaGIC SaIL GRaUP Based on the We6 Soil Survey p�•ovided by tlie Natural Resau��ces Conse��vation Serv�ce, the �ite was initiatly designated as conta�ning I�ydralogic 5aij Graups C and D. �roup C a��d D aresim��ae ii� tliat they ace bath compeised of f ne-g��ained and�ir nearly imper�ious mafe��ial wirh slow ra ve��y slow infiltration rates. The main distinctEan between the twa groups is Chat Graup D soil conditians are less favpcable �or infiltr'atiot� of storm wate d m6F due �a �y s�aw �•afian i'ate�i ru�f pote��ri�,l �y wirh � shril� -s�v 1[ �atent �[ WltI1 �li�T�l �I' bfl , and soils rhar a��e shallow �� ��ea��ly � in�t �l �ed on � 6� � dara �ined du��iilg the �d ��a�i �� the �esu of � lay �stE � s Q pio tha tlle enti��e 5ite is �te defi��ed as Hydrolagic Soil Gra«p D. 5ee �ure 4: �Iydralagi 5ail �rou Due to �ew � encounre��ed � an �e �e 6 LS to �. �g � the field it�v�fitE an, �i �bn �sfi�� �,s not �d �e��ved �low � drate�� ai1 �a h�ra �e s, �lu ding ¢�tent �ir �tia��al maferial encaunfered at �w ��; a��e �t � �o to veey�w lial� t� and a�'e in puo-��r 6 rhe�c�sc��i �rola � sa�l gp. 5 17227 Geo5olut�ons,iN�. El•oom b'illaggio 5��;,ci[1 Plan 7une 28, 2�1C _ _ _ Pro,ject No. 6L�9734 �i'�- �' ' ,��n` t=�. :'lljw � �y �- 1 :��,��� �� `�;:� � � - °,�� y�, il S � . ' .pf'I aJ•' �yql ��`1 �,:.R.. ` . ,1+����.� 7'F� r�,Y1 .. 1,-'�'.!K-l� '�+ � / i� �pl� �,',J t; ] f..��;, f�r �� ,-.. � {�,` _'��:.�.' , � —�' ��'. ' -�„, , � �~ 1XYf � •y '4'� �. �1 , �,�'��K__ �f I� ��)'�T_C,R�UPD SOII. lB�����r �}s �,x � GROU7'C ����;`� .�� � ��,� 1. ��,�,'r - , . , a� ,y.. " � �� f fil �1` �i+l_ br' Y�l ,`, �3 � . ti.��� �� � , , ;.����'< <� „i }�°S.i,t, .. .'7 . � ,�!���(�',. 5.��'�_,�r1' i i -�� — � - ���*l �;y1�-r i'� fi'..'-'- I ' I y r: 4. I� . ��. �� -� ���- .��r�„# �r�s, ,ti {'' �:'"�,i �. I'• � �� '���, :,ru�.� ' � -- ' -- � �;�� �, --__.=- ,,��. � - . ' �. 1 ..� f, :t�fi `�'-. __ � � ..�' �ti. �.� � _ � . -_ -----�_ ��ll���t�.��`, �:r ��.; :; Hydrplogicsoil graup�lrek>�g�donest[mat��of�unof�potenliaF.Sofls¢re 61 RBting�g ons assigned toane pf faurgroups accorOng ta Ihe rateafwot�f infiR�atio�vh�n lh� � p soflsarenotprotec[edbyyegetationarathorough[ypvetandrecerve�recfpitat n fromtangdUraUonatorms. 0 � Group C.Soils havinga s[owinfiltr��ion ralewhen thorough[yyvet Theseconsist [� B ch[efry of soils havireg alayeRhal impe0es the do�vnwurdmov�nient of woteror � �� soilsofmoderntelyfinetexturearfine texture.Fheseoilshave aofawrateofwnter transmissian. 0 � �,ruupD.Soflshavingavery�lowfn�ltratfonrate[highre�noffpoten[i�l)wh�n � GD �hpraughfyrr�t.Thesecansislchfe(lyafclaysthnthaveaEg shrink-sweYl �t ba 9 pv a It� kr pt �o tha be n oyp3 or�i �r 0 6 h o 6 the� nd da �h ne W[ ar nearlyfniperviousma�ff � ry4�p� ornotavoilab{e Theeei6� �v !yv �tv fe o�� tra ami6sion. �I' �, �}0�0 �71� �Dll�) 5.0 SEISMIC DESIGN CONSID�RATIONS 4,1 Se���at�c II�z�rd An�iiy�is I, According to sectian 1613 af the 2a13 CBC (CBSC, 2013}, al[ structures and portions of structuresshou[d be designed ta resist the effects o�eismic laadings caused by earthquake graund motions in acco�•dance with the M�ni�rzzcn7 DesignLoacls,fof�Bzc�ldingsand Othef- S trirctirres (ASCE7} (ASCE 201D). ASCE7 considers the most severe eai�hqualce ground motion to be the graund inotian caused by the Maximu€n Cansidered Earthquake(MCE) (ASCE, �Q10) which is de�ned in Section 1613 af the 2013 CBC to be slioi�t�eriad S�s an� 1-secand period S�i, spectral respanse acceleratians. 2. The a,nax of the Site �epends an severa[ factai�s,which include the distance of theSite fram known active f��u[ts, the expected magnitude af the MCE, and the Site soi[ protEle characteristics, 3. Fls per section 16133.2 af the 2a13 CBC (CBSC, 2a13}, the Site sail profile classi�catian is determined � the �vera e sai[ propeities in the pei� 100 feet af the Site pro�le f� 17228 GeoSolutlons,iNe. �'florn/EI f�ggio 5peci[ic Plau �un 28,_20l6 Project I�lo. SIvD9734-I, (ASCE .7) Based an th (Ni}�o val�►es ca[cu[ated �'ar�k� i��-sit�i tests pl'orn�eci d�i��i��g �i field investigatior�,and the res�►lts af� tlielabaratory a��alysis o�'the in-sit« soils tl�e Sitc was defined as Site Cjass E, Sof t Soi1 profi�e f ar the lawer poi�tion ai'the Site and S'rte Ciass C, Very Dense Soi� and Soft Rocic pro�Ie i�ar tE�e upper poc�ion af the Site wl�ere �b�v farmatior�a�erlater was �ncauntered per ASCE 7 Cliapter 20. �} Acco�•ding to sectior� 11.2 of ASC�7 and secti�n IG13 of tl�e �13 CBC (CBSC, �13}, buildings and fi�'uctures sltould be �ecifically �copartion ta �si �ig�� Ea��thc�uake Gra�ind �Iation (Design a,,,�,), �CE7 e1 fies tl�e �i n a,,,�,as �� eai�thc�uake�u c�tions Ut � two-h ds �i � �r gndin � �li �jlotia��s (A� �� p. ¢a9 �i o tf�e �'r a,,,;,, �r � Site 's � ta S6l�D.4 S g ad Sas0.854 g for � upper �uvrt of he Srtc � 6`si � and �����774g and �Q.769 g for the lower �ido b th � �.Si � E}, wl�ich se �ond period � shoi�t periad �esi �ca p�e � that a �a t� twa-tl�irds a�'the a,,,�,,� p �I far he Site. 5 � cd� ates of 35.248�5 �,ees n�rtf� E�i anci -L��4 �s �t lt�ngit de ad a seach radius af� 1 D n�iles �e aed in the bro �b t�t� � kid �na[ �,� BuctE�ral__Buil[li�ig ��i ��t�im _ _ I. 9fd� �I�� ��si pra�l�teters �1ti�� cltapter 16 af tlic 2013 CBC � �.613 ad � j1.43 el Y4.4 of �� are ��cie��t u�an sre �a f�tors �vhi ini�de �ike s �c•o£'tl c�a cteristics and tl�e lacatio��s and aharistics af�fia��[t �e the �e �1 �1 eib d i�� sectian 4.[ ai'tE�is �-epoc�t � Site sail � �tia�� � � b � f�e �� �lii Site G� E. �'is Site sail �¢il�ssi and the �i d [ong[#� caardi��ates i'or the 6ite we ��sed ta ti�te tl�e siructura[ �i[di �esi �� �a�r► 2 �t �e � etN�ns anci Site �'� �v�e b taitid fran� tl�� �is �ktaz � �'ves ad � �I'd � anse �ct �7. Seismic �► � t�p utet' ap �Zatio �'J �}; tE�is � ram is fa�a fi�1i the Ht� States �gica 8 rv� �e (LTS� Q� f�`is �ter �o �SiFi the metllacis �d � � �g �,00 �,6 � �1 2613 errata eciirie�� af tl�e NEHRF �d �io for 6ismic � gulations f�ar � �ui a��d EAar �•es d ��se � tk ed � lati and � i��t�� ta calalate t�s sie igr� p��te d p�e �ctra �ith �'ar }�eriod ad disp�� �, �'or Sitc �si cations A �ira�i E An��is a�' tlte�i �e �pon �s �e 6r � Site ein af the Opcu ���c �l�jte farthe�copaseci 6tt �ssi n ta �5 �IIO�Gt a fdis �e � 6D }�er �b�es �13.3. �( ad � ai' � 2013 CBC (� SC, �f 3). 3 �'h ste �eci �1 �ea �un �e[e (PGAN�} as cictern�ineci � the 6� �put er pogr � ��'�'e �e PGA�,r = �.g fa � �i}�per pa��tion of tlieSite �ite �s j� d PGAh� � 6 b the � portion af tlte�e �e Class � wl�ich is �nt or� ��it S o� 6 � the � �ki A�is �ailed �arts �� � �nda �e �e � �[T�G �esi �I Su�11�11ary a��d �aileci Repot�ts. '] 17229 f=eo5alu�ions,in�e. Froom/El[�ggio Specific �h June 28,201G _ __ , Project I�o 5L09734- �.3 Ligi�cf hctian Potc�itial l, In the contextaf soii mechanics, liquefaction is �1 pcocess that occurs 1�en the dynamlc laadin� af a soil mass s�i tl�e sheae �tg�hh of the soi! mass to �apidl decrease. Liquefactiancan accur in sattiirated �fiess soi€s. . The most �hi iiquefaction-induced failLit•es [n�e s�fatian of €�quefied ��, s�i��face sand boiL� iateral spr�ding oF C�i ground arface, �earin i�ac ��ilur of sqt�raL ��undatian flatatian oF bdri si�Cfut' and diffel'entiaL �ettEemeh of a�ove- groun��k4tres. ;. Liquefable sails must �et• ��rtni load�izg befoee €ic�uefac��an a�cuc•s. G��ound mation �i�om an eat�hquake �nay �lu large-am��itude �gc rev�e5a�5 of�iear 5tresses within a soil mass. �a}�e lateral and vert�al loading and un€oading gtal€ �s�llts feam this �racess. This process � ednsid to � dynamic Eoading. ln a Eic�uefiaE�Le �oi Snass li�uefaction� accur as a� ult af be �na Eaa�ing s�.aL by gt'aund t�o n �ed by aneaitl►qual<e. !� �'h psenc af�aas� �al•l �ra ed �t and �eria€ tl�at �c�a by �t• w�h n an e fil�at i 1� ta � �tt�ed b tgh �ii t�si qa��th �s and Eong- dratian gt�I rrti � the � �actor �t �ndica �ratentiafl IiquefiaE�Ee areas and �n that�ead b Iqafact 5 � on the e�te cy and t•eEative t�ensi of the � soil the �atiaE far�is �}efaction af b at the �e s �. �ing that the �tb�ns of �he6i1 �� Repoc�t � �e �nted �li ptential �o se'tvally in�uced qmttle and d�F e�ntial �1t at�h ge is ��ed ta� law. (i. GENERAG S��L�FOUNDATION DISCUSSION � is anticipatedtfiat �i �s wilL be c�t fae aEt�'i of the �tsed �lan and that f�id� iL[ be suppai•ted by �er �i �ed an th ainr�ace qs,tigat�ai� n �h �er �i pottians of t[�e�e it is an�ci�te tl�at�li �aundation fae�s in fihi area w�l� �e exaza �d inta p�tent 6�a �nateeial. �d faot�ngs may be �un some areas to �int tl�e �ninimu�n �n into ��[npe formatioizal materiaE 6iL aonditio �ncaun et'ed �uriiz the�7d �iga varie� including � �� l�ly guessible and �xpa�� ive so� , and 6�ailo �t fai�ianal material. � ta the presence of �ighl ��s�ve �e sails �n �► gt�und �hin tl�e lawer �t �eeas �t s d��nme tha as a mum, the n��e 36 �e (3 �eet af� �pm nt aeea shaul� Gansi of a select �lu �E r� tap af� �t'ad or in��t af tl�e�tin surficial soils. � s �►tend � �t as a ballast � �p, p�I� isalatian �i �1 eased fijrabili ebav areas af� �b highly compressble �L expansive soils. �. inca s� v1 de�tl� � �el �mpoet material to aminimu of 6 fee �k a�tEo fot•a reduction in faundatian�t'ements. �'i �t �iscusses both��tio � the �ence af�ai �thered �e�roc �nateeia�s �ilcountered � ring the fieEd �t�n hard l� �ian sondition at'e e��ed du�n �evelapment af�uild� �ad �as and ��o �i�ity �tu ion in tl�e��p grtion of�he Site. l� faundatians are ta b � into unifar material ta [i� the �atentia€ for distt•ess of the fida s�e�ns due to diEfen ial �! If cuts � tl�an �1lawe by Eate of �io 8 17230 Geo5ol�rtton�,�n��. FroomlEl Vi{laggio Spccific I?lan �tne 28. 2016 Pro'cct I�la SL0973�k-1 Construction 5afety Ordars f�x "Excavations, �'s�encll Earthwork" �r praposed, a numerica] glop stability at�aiysis may be�ess forteinpocaryconstruction slopes. Natui�al seepage at t[�e inteR'�ace��f two �ateria� with �ifferent� sucL� as t�ativ�soil and engi�eered fi�bmpetent formational mat�rial, is very cotntnon, Tliis i�f�ce �ccur at tl�e Site and is likeiy to require sub-suR'F�aca drains �itiains sllould be p�aced in estab�islied drainage courses, potential seepage areas,and ciuring the deve�oprnent of alL key and ben�l2 gx'a� operations. 7.0 �ONCLUSIO AND RECOMM�NDATIONS. The 5ite is aitable foc��i prop��sed deveLopfnent peavided �li recorr►men�ations p�ented in tliis repo��t a►•e i�1c��R•p��rale� �nto�l1 pro jectplans and s�ec�flcations. Tlie primary geotechnical concerns at the Site are: f �`h potential ��f grounciwater seepage, encountere� between 1.5 to 4.0 feet bgs in the �allo s�- ce. 2. [�'e pe�ce fi lii�[�� expansive surface soils. �.nsive koi tend to � t�n �osed to e�ess 's�hure ei s}� nk 6a�n ��� to �ry. Tlie soil �ne �� tlie upper 2 to 3 feet of� �e is mast �ffect � illese seasonal ��an in t�ais content The �olufn �llat�ge associated t�ii. �ll �i �►en t can stress and �atrta �da�i concrete �hwork it�terior sl�s �de, ��nd roadav y �vetrtents. �'iindations suppairted by �ive �ils sliould be �si by a C�ft�t �git�eer in accordance�tl the�a13 �ifo t'nia �lding 6X1e 3. E�'� �te fir 6� s��i fnateria�s generated 6tn �efnov of� trees and root�tems �td� the�.sed l�ig pad areas 4. �'e pesence i�f 5�1c�« W, liar�l be�eack aiateri �+(iin the �1��tian of the develop�nt. Hard�av t���ns are�At�l in some areas ��u�in building �d preparatio� and timiderg tn�ili const�iion. 5. Tlle p��tential fir d�erenl�al �nent gcc�iri'in between �io ndations �po on tx�v soil glatec� � �ft'ent �nent cllaracteristics, SLLC�1 as native soil and et�gineered �i�etent f��rmationaL inatei'iaf. �'herefore it is tn portant tllat �l of � fo��nda�ons � 6de i� g�all �t uniform�ate �n acco�'dance�h this repo��. 71 Sitc �rc�ar•�fi of Snilclin P�cl_A�-cas I � is �ad ha �� pads iJ� be constructed fo� a �y of the p�sed �t� �t anci l�at fio ndations k�vil be a ��orted by �eered �i �ed n t[ie b�{ s�iR•face �t�n in tlie upper �o�in ¢�ot�tion of the Site it is anticipated that tlle fouda ti�s fo s�a� in tl�is area will be �ated into corr�petent fi� ational matec�ial. �pene footings may be C�red in sotrte �as to inaintain �� iati� �mbed�nen �nto cofn�etent�6iQna� inaterial. 2 ri� t��� pc�es�nce ��f�i11y �¢ansi surface�o and�hw �nd 'ar,hin the �a�v de�fi areas, it is recom�nended that as a i��n��tn the p 36 i�es (3 �eo he deve�opment area sho��ld consist of asefect �mport materi� on top of� isting �rad o►' in teplacemen � the st ng �i�l soi�s. T�his b� �r for port of inat fi�mt f��r � prop��se� �r�ict �. in�rease in tl�ickness of � �Lect ifnport 9 17231 GeoSolution�,�n��. Proom/�l Villaggio Specific Plan lune 28, 2016 Projecl No. SLO)734-1 material to aminicnucn of S.0 feet will allow f'or the use of conventianal fautzdation � syste�ns. � �. Far the development of atz engineered fill pad with a36 inch (3 �eet}select import pad cap to receive atnat�'oundation,the��ative matei�iat should be aver-excavatec�at least 36 inches below slab su6-grade etevatlatz, ta competentmatei�ial, or ta one-half the depth of the deepest�[1 (measured fi°om the battom of the deepest footing};whichevei� is greatest. The exposed su��faceshould be scarified to adepth of 6 inches, �noisCu��e canditionedto � 3°/a over optimui�tnnoistur'e content,and co�npacted to amin€�num s�elative density of 9Q pe��cent (ASTMD1557-07}. The uppe1• 36 inches of�uilding �ad areas should consist � of an approved select impol•t material processed as engineered �ll. Atl �nateria(to be t�sed as select i�npoi�t fitl sha��(d 6e g�'atzutar soi( with a very Low to low expa.nsian potential(�.e., expansion it�dex of SQ or less} and must 6e abserved atzd approved 6y a rept'eseiitative of�ieoSolutions I�Zc. p►'ios� to its delives�y ta the Site. Ref er to Fig��r-e 5: Sub-Slal� Detail fo��under-slab d��ainage mater-€a(and Appendi� D f or�nare details an fill � p(acement � ��, Fa�' th� d�velopm�nt of anengineered fi(L pad with a60 inctt (5 feet}select impar�t pad � cap ta receiveconventic�n�l foundations,the native materiafihou(d be oves�-excavatedat least 66 iiich�s (S f eet}below existi�ig grade, 36 inches � f�et helow the ttm of the � �ootin to ompet��t �nates�ial os�b one-half the depth of the deepest fill(neas€�red �m � the � o the � �'ooting) �euC is �atest. �'e �ibt af aver-excavation �1 � teiid atxti�i of 5 feet��d the perlmete�-fautzdatlo��,to pp� rty lines,ar �n �e� �ich is (east. �'e expased surfaceshoutd be �Fied to a depth of 6 4��ches moistui�e canditioned to 3'o avei� �ptimu �aist �ontetzt atzd a� �ac to ainiitn rel�tive d+�nsi of 90��it (ASTM �- �'e over- �uated mate���al,cleared of e�es�si �r-� and deb�•is, � uld then he pt�acessed a �l�ered fiti up to within 6Q inc es af the surfaceof� b��ilding pad. �`he u�per 66 inches (5 �'eet}of �u�lding pad areas shnuld consist o�' an agpraved select irnpo�� �naterial p�'a�essed as er�gineered �ll,All fnatei�ia to be iaed as select pf� fill sha��(d � �t� eil �h a ves� i� to low expansion potential(i.�., expansioi� indexof 50 0�� �s dii �st be observed�n atp� 6y arepr-esentative�So(utions, �ic prio��ta its d�li�ery to� �e �e�' � I'g��r'e 5 Su -Slah Detaii f or e�s� �a materal and Appendix D� more�etail o�i fitl�lacement 5. Fa�� s�aii ons truction � foot€ngs founded a mini�ur�a af 12 inches into unifarm cc��npetent formatianal material, the pad a��ea to receive slabon -gt•ade �ti�n should 6e graded ah that al( slahs ai�e suppot'�ed o�a unifor�n competent i��te The �ative mates�ial sho��id be excavated beneath the �la at least 12 i�iches bk �tin � and finished sta6 �levatioi� to co�npetent�naterial oi�to one-half the �th �f t �leepe �II whicheveris greatest.�'e ��ed s��rfacesho��ld be �"u�Cl to a �pth of 6 inches, maistui�e d¢tianed to 3'/a over aptimum t�oist re rontent and compacted to aminimu relative t�ns! of 90 percent�f �573. �e over ��atec3 mate�-ialay then be p��ocessed a� �e�-ed fill �i ure 5 �i �kail f or � �a materiatand Appendix D�a�-�nore details on fill ptacemetzt. 1[} 17232 GreoSolutions,�n��. Froom/El Villaggio 8�ecili PlaEi Ju�ic & 201C Project�Io. SD734- I G There is potential that soils e�lcountered at the rec�uired foundatio3� excavation depth ma.y exhibit soft, co�n�ressi{�le co�lditions. [f pumping soils are encountered at the {�ottom of the excavat�on, stabi[ization wi[[ {�e aecessary and may require the insta[[atian of awaven geotext€le f��bric, s�ich as Mirafi 600x oc �quiva[eat, an tlle pr�pared battom af the excavation. lf the soi[ w�thia the �xcavatian is aot stable enaugh fa��proper iiistaflation QF the geotext€le fabric, roc[�a��hx�i of theexposed sub-grade may be r�nuired, with the placemenl and compaction of 3-inch ta 8-inch diamete (ga{�ion) �ewi stoae inta the saft sub-gi�ade, unt�[ stabiliry is achie�ed, as abserved and approved {�y apresenta.tive of tliis firtz�. Alternative recammendat�ans may b� �repared �ased on the canditions �ncauatered. 7, Ift �ll areas are co��structed on s[apes greater than [0-to-1 (harizantal-ta-vertica[}, we recommend that benches be cut eve�y Four Feet as �i[I is pLaced. Each be3�ch shall be a minimam of l0 f eet wide witE1 a minim�un af twa percent gradient i�1to the slape. IF fill areas are constE•ucted oa s[opes greater than S-to-I, we recammend tl�at the toe af aff aeeas ta receive fill be keyed amin��num af2� i�lches nto gnd�rlyin d�ase mat�ria[. �tains �►a be placed in the � way aad {�e�}ches as �red 5e Ap�ersdix Q �ail �, K and �ch wit�� �kd for detai[s a�1 key and be�}ch s�nn ctio�l. S The reco�n�netlded sail moistur� cQntent shauld be maintained �uria canstruction ai�d �v,7 �o�� of t��e proposed devefopment Edere sail E�tst s not ma�a ined, desiccation crac[�s may develop �a,ich indicate a loss of soii �ampactia�l �di to the poteatial far �ama ta �aundations q�war �vemeats, aad athee ��e nts. 6ils hat have �ca cc�ed due to L�ois loss should be removed �fi cient �lep b � air the c�ed soi[ as observed by the sQils �ngin�e�' and tl�e �ed materials sl�anld tl�en �e �s coaditianed ta �i�nately 3 pe��cent ov�c aptimum va[ue, and�ed. Tuped�4eann� !l� „r6cUu ���' -_ i - "�,_ ��f� �. � ����YTS � ���,� - - . -_y. � ' . � _ . - �_ !/A"Coa�fMhy� . S1��IicAitr i':�par 1ltriter (AI+'I'.�t E:fE-13.?dl � BC 5 rL-� �71 nC-t�IL� � Bre�ar.Zti u�P�ivec� Areas l ��ne�it areas should �� excavat�d to �ate sub-grad� el�vation oc ta competent �na��rial �ch�v�r is �� Cf� �ed surFaceshould be scari�ied an additional d�pth u 17233 G�aSoluCFans,[n��. Froon�/El�'�a Spccifsc Plan �une 28. 2Q16 Project No. 6L0973�4 of 12 inches, inoistu��e conditioued to 3%ovei�optinlum moisture content, and com�acted to aminimum relative density of95 percent (ASTM D1557-07 test method). The tap 12 inches af sub-grade soil u��der all pavement sections s�ioul be compacted to a minimum ��elative slen ity af95 percent based on the ASTM D1557-D7 test inethod at slightly above OptIC11�1C11. 2. Sub-grade soi[s should not be allowed to dry out or have excessive construction traf fic between �uo� canditia��ing anc� �ompaction and placeinent of the �avetxte �t��ra� sectiat�. 3 'I'here is potential t�1at soils encountered at di i�equired foundatian excavatiatt depth rnay BxhiE� soft, campressible conditions. I�pumping soils �r encountered at tlie bottom of the excavatian, stabilizatiaii will be necessary and nlay eequir Che insta�ltion o�a woven geatextile ���i suc� � C�i �D oe e� siivalent on the pi�epaeed �n 6 the i� f the �oi wi�hi t�1e �vat is not stable �o�i h 6r p�i� k#al ation of � � �i,aic �+a 6�iikiii of the �� sub-grade �a be��ed, with pli �ceinent el ampaction � �ich to �ch diameter �ion} crushed stone into the 6t su�rade unti[ �ta iLity is �chieved as �tkser �d app by arepi�esentative of this 6y. �l� q�z►nendat en �a be pre ai�ed based on the pa,�dit encountered � �lu ta the �ansi �atentia � he soils at the �e the base coui�ses beneath �in einforced �m �t ►nay �ai ca�lsing �ng � the �vem �t s�' faces, as the �b de �erials ��o�e laterally �ui�in �p �n ive �rin s�l gles. 5 �'i'efare, in arder ta minim�e tlie �tential �oi�the �a a�� fi�ment sections at tlie ge, � Inc i�econlnlends that a�orcin �e �d �li as � BXl ��0 ��e SBXI � ADS BX114GG, or �ivalent be �lled to etiforce tlle ba aurses under paved ai�ea � the �e. 6 �Salutions, I�Zc. slzould � contacted prioe to the �esi �d construction � �avenlent sections at� �e in order to assist in the i5�iect � an �at latera�inforcing �i� �eogric� �o duct and to �de i�ecommendations�din the �dui�es 6r tlie �ista ton of�b pi�od�icts at the�e 7.3 �te�pnent L L41 p�ement ba�tru and l�ater used sllould 6�n to 6�� �5 26 and � � the latest atlitia af t�le �te of fi�ifo Depart�ne�lt of ��pation Standard �eci��cations (State o��i�o fj949 2 s1 n dicated �u in �ction �, the top 12 inches � s�t,a de soil under pavement sectia��s �u[d b ca�npacted to aminirnum i�elative tt,�nsi � � �Zei�ce based on the ASTM D15�07 fie �nethod at �htly above �t � � h A� bases eln �se should also be �ot�d to a nlinirnum [�Lve d� �� p�•cent based r� t�le��ioned test method. 3 �ed on the �a ond�t�ons obsei�ved and the results �et I�Ur� �stin �ei�foi�me�l n s�rfa � �lin the �e an R-Value of 5 is esti�nated �oi��reliminae �avernent ��i p�pases miui o�10 lnches of� II� �e is r�com ended �r � �vem S�Ct�0I1S. �WILl� �e � with select iinpofrt in p�sed 12 17234 G�o5olu�pons,in�� �i�aaml �� �pec Plan 7une & 2016_ - — . �rz� No,.6D9734- _ �p� nt areas, additional �a1�Ee testing may be p�ocmed to d�fine the �ppropriat pavemeut structw'ai s�ct Ai[ �a�ti� sbu[d be crowned for goad drainage. 4, In a�'der to minimize the potenkia[ f�ar��ac!<in �af the pavemeiztsucfaces at the � d�Ee ta latera[ i7lovement of tlle base ca�Erses �urin �ans �llirin!<-swe ��c of tlie su�- grade �ateria �eaSol�ttian �nc 1'�com�nends �4 a [atera[[y-regiforcin �eatile g E•id, sch as Tensar flX �}0 ��c SBX I l, �DS BX l[4GG ai��q�fGva be �ta[�ed E�eYwee klZe�►'epac �b-grade and � materiaLs at the Site. 5 GeoSoh�tions, �n��d be cantacted prior ta the ��s and construction of �11 �e e�s ta �dv recam adations regarding�h �etion of and Insta �t � an � �'al[ �i� geogrid �iro cC- 7.� Cii�entioii�f �ind�Zt� ns I. C�tttio a[ onkinuous and �d f�aatings with grade �eam �y be �d for suppot� 6 tlle �se t�res �ola�ed pad footings ai'e nat a[[ow� �t��dat �u be �dsi in a� ta�t 1808.6, 2013 C BG, �undations on E�ns ive �a 2 il�iu �dc�in �ea �am i�s an dept� in �eel'ed [il or if�ai� cm petent farm�ionai material �11ou �r to the �ollowin �ab[e as �a��ec and ��i 6y a r��sent o��ea5olutions �x► Tai�le Z Mi��imu m Footing ��nd Crade l3e;mi Diu�eusions Perimete�•Footings Grade Beams 12 i�11 � �tory Minimum Width 12 aicl1e 15 inches (�w �tory Minimum Depth 24 inches 18 inches Minimum Embedment in Competent 12 incl1es - Formatianal Material 4 �5 bar 4 #4 bai's Minimum Rer��f orc�n�" (2 t��p I 2 batt�m (2 top I 2 ba�;m Spacing - 19 f ee �qntei' �ac �v Y 6tee s11a�Eld be held in plac by � at �ppi'apria �aciizg to �ns �rop �asitionin � the stee[ �ee WRI �i of �b Fo�mdations and ACI 318, �a�► s —�cin Reui�ce snt ). 3 Minvnut7l �i�ifarcin fo faotings �uid conform b the t�� endations ��1 n �'abl 2: �n �b eln �e �ea �m�ns �ch meets the�ns 6 �a 18D8.6 af k11e� � B�Eildin� b�le �o � koi canditions �t � 6it � cing steel sllauld be �le[d in �ce � � at �pipte �cing b Hns p� p�sitiouin of the �tee in accai�dance i�it WRI @�si of �#ab r�d �'�tndatians �d ACI 318, 5ection 7S —F'iac� Reinfai�ceinen B 17235 �E�p�'lp�l,it�pR9f IN[. �loam �glla o �ci Plan Junc 28, �l6 ProjcC IVo 51�l9 .- -_ � �1 representati�e a� this firm should obse�•ve and a�prove all foundation excavations for ��equirec� embedment depth p�'►or fo the placeinent of re�nforcing steel andlor conc�•ete. Cancrete should be placed only in excavations that are Pree of bose, soft �o and deb�•i and tl�at liave been mainkained in a moist coiidit�oi} witl� no de�tion cracks�resent. 5. �1n allawable dead plus live load bearing p�'essure�6@ psf may 6e used fo�•the design af faotings founded in 6Q inches of selecf im�o��t fill n accordance wikh the reco�n�nendations presented in 6ction 1 Site Pre�a��afion of Building Pad �Areas paragraph 4 �.4} and an �lfowabl dead pl«s live load bearing �ressu�• 8�2, psf �nay be used fot` tl�e design of footings founded in uuifor�n co�npefent fo�•mational aiate n accordance with the �'ecommendations �i�•esente in Sectian �. �e �•epara of�u � � ,� � a gra�h S �1 6. �l�aw i�r capacities g�a 6e ehc�'eas � �#ri�ci �h t�ient loads such a wind andlo�•6�.ismici a�•e ii� .7 A tatal�nent of�e hn 1 nch and a� �renfia �t of less than 1 k� in D f eeta�'e anticipated � � f�e an s�u qy be �•esi�d by �rass ��'ess�l�'e acting �k he side of � �ot ad lo�� fi�•ictio � the �ered �i o�• t�ifo�•m p�kent �br onal ma��' al and h t� of khe �oot l�{as f�•om�ble 3: �iundatio �� �ce �m can be used to design fir I'esistance to late!'a � ds � f:rictbn and �s �ess a�'e �ied to resist �l forces actv�� on shallow �ootin the lesse value 6�o be �•educed by� p�•cei1t. Table 3: Raiu�[1<<tiui� Lateral Resistsjnce E�r:u►iet il�ou � �c �v . —�, �ii F�c ar �ial Pressure �cf �if o�' �nt �al �Q [�5 �ater Sfect �'t ��'ial BQ @5 9 �unc�atian �gations b�o�lld be observed and �d by arep�•esentakive of�hi fm ��'io�•to the placement 6 �iiif o�•cin steel �rnd L�111C1� l�tonc� k �es sholal conf o�'in tio the � uirements of�te�• l& of the�test �ition of he CBC (CBSC P�} I I [�'e base 6 all �ea beains and f ootings slhoul b �ve �d step�ed as � uired to a�� odate �n c�an e in � k�ile still �ri�i in�ng the inimum i�d �ootii7 embedment and �pe set6ack i�tance L� t�'e inum f ooting set6ack i�tance fiiro �scendin o�' �escendi steepe�•thai} � (�€izontal-to-vet�tical} lat fess than 1-�� m�lst be ►n�tained . Se �'��•e 6: � � — 6�e Cadients �v een �o l and �� �tbac �ensions — � fi'rra ents B�n � and to -1 6 the mini ��ta l�ekbac distances �no asg�nd and d��lEng slopes �ee than 3-�b but notsteepe�•than � 14 17236 Ge0S0lil't�0175�NL. FroomlEl idillagg �pec Plan 5une 28. 016 . �b�- -l�o. ��D9 -- Fncr oH rooTrrrc �� Toe Or I I SLOPF. i-!i1-i��i�i'-.���� I ] _ JI rAcr orsTRucr�ii� �_ � � i I'—� TQEDF ,_I7' j� �\/ [S SLDPE ___� l[/3 BUT t�EEn NOT � EXCI3GD�l6 FT [ � (12 l92 mm)MAX. _ t�T- �l�F-f �� — . 1 I TI2� tVEEI?NOT EXCEEI?6 F"1'.�4572 mm}MAX figur 6: Setbacl: ���sians Cr�idieots I3et�veen 3-ta-1 ancl l-ta-! 7S Mat Foundatinns I �anventinnally reinforcec� st��uct�iraf mat slab f���indation systein could be �itilized to suppart the proposec� str��ctures as part of ti�e devefopment. The matmay be of auniform thic[cness design, or may cons�st of shear and t�a�axesisting grade b�a�n witfl ste�ctural slab elements connecting tf�e grade beams. The inatmay be constructed directly an the 36 inch [ayeraf select import material,per section 7.1.3. 2. Based an our experience, a mat slab appcoximately lU to 15 inelies tliicli coLild ba antic�pated. A modLilus of s�ib-grade reaction (li.)of 50pci may be used in design. 3. An a[lowable dead plus live �oad bea�'ing pressu�'e of QaU psf�nay be aed fordesign of mat faundations in accordance witfl tfle secommendation �resent in Sec#ion 7.1 Site Prepa�•atian of Bui[ding Pad Areas, �a�•agra 3 � . �a6mum reinforcingsh��Ed b as directed� �l� p Struct�u'al �ee � �'datian �axcavatio sf�ould be �I�se�- and �d by arepresentat� of this€�m �n' to the p�� � reinfOrCingStee� ��� concrete Concrete �ihou be �,ced �nl in �a �ion �t f�ave been�.pt ahoi �d are�e 0��OOse �b soil �ar�b S, Latei�a for�s on C� s�a be resisted by �assi press�u-e acting againstti�e sides of �all ��o �d f CICYIOB between ti�e native material and the t� of ti�e �et�n �'r �ace to l�e �oads a fi•iction factorof�5 may � �Jili fo �ing resistance at the�e �af�ootin s. G ��tnda �v sho�iid be ��}ser anc� �ppro ed by a�s�nt � of tflis �in prior to k�e �iace nt of�'einforcing steel�r conc�-ete 7 �undation �es� ����ild �anfor to the i�men#s af�pter 18 of the [atest edition ofhh C�fiifo � B�ildin �e �. �xlc Gaistt•ucti�n I, �ete �a sd �twor should not be placed dicectly on �d �ati kte �a of�- de ta �cei concrete� anc� �wo�- sfl�aLild l5 17237 Geo5olutlotts,i�u�. Froon�El W,illag�; SE>ecitic Plan J�ine 2A 2016 _ Projcct r1o. SL0973�4-1_ be processed as discussed iu the preced'uig sections of this report. Conc��ete slabs should be ��ed ouly ovei� sub-grade that is feee of loose, soft soil and debris and that has been maintained in amofst co�1ditfan with no desiccation crack.s present. 2. Cancrete s[al�s-on-grade �ou�d be iilcoclfor�nance w�t11 the recoinEnendatfans provided in Tab[e 4: Minimum Slab �ecoEninendation Refclforcing shauld be p�aced ocl-center both ways at oi�s[ight�y above �h ceilter af the shua! section. Refn�orcing bars should have a mini�num E�ar cover of ]..5 inches it�he lap�fng o� �ki slab ��1 is ��equired laps in ad jaceut bars should be staggered a ininf��nuin af eyve five feet(see WRI Desig�� of�b- on-Grouud �'oundalfons, 6� Placement). �h r�cominended �inforce�n may be s�d fo►-antfcipated unif orEn floor bads not exceeding 2a0 psf If flaor loads �ater than 200 psf ai�e antici�ated, a Str�scriical Eclgineershould evaluat the slab desfgn. �i 4: hflm�uu �� LdanEn ect,iCian Minimum Thickness 5 fnches Rein�'orcin�* #4 bars at � inches ocl-centereacll wav * Where [ap�ing of tl�e slab steel �s c�lired, laps in adjacent bars should be staggered a minimum of every �ve f eet (see �8'IRI/CSRI recaEnme ndati��is f or SteeL �tace Section 2). 3 Cancrete fo all slabs should be placed at a�naxfinuin slump of �ss �n 5 inches �sive � GDI1rBf1Y 15 t�lB�i'7 ��u of cancrete crat�g. �' � e used to afdin tlle contro� of � water-reduc[ng adEnixture �n be added to the concrete ta iucrease sl��En� l�le maf�ita�ning a �� �t t�, whfch will liEnit exc�ssive �Zrin F�oh jafnts should be const��ucted as req�d ta conh�ol �c �k, $� concrete�cl-gcade are to be h�e4zis Fo interior conditiailed spaces, � slabs �iu ti � �lt�xle by a i�timum af fir inches af clean ��dra �tfal �. as a%a uch coarse aggregatei�} to�er as acushion dna � �rea � mois�u �t4�ce storage or floar coveri�igs are antfc�ted a b �hn E�go Wrap r�ra (� e�atra[ent instaped per macluf�turer specifcations} �llo ld be placed bLer the Fae-d mfclg Enaterial and the � ta in� ze tsois condeclsation �mder the floor goverin See Figure 5: Sub-Slab �ta�l fa � placeinent of under-slab drafnage Enaterial.� �s�sted, but clot c� uired, ha a bl� �fifc sand �• be �lac on top of tlle am�beane to assist i�i the �urin of the concrete, iicreas�ng the tiept of the Einder s[ab materfal ta atatal af six inches. The sand 6�ia be �g aistened prior b placfng conc��ete. 5. � shou�d be noted that f or a�a l� iclstallation b conf orin to �anuf acturer ��ns sealiclg of�►�s, joints �i edges of the vapar barrier �brane are (�eca lly required s1 ip�d � the�alifo �ldfn Code,joints ii the vapor barrier sI�t�u be Iapped a�niniEnuEn of 6 inches. f the f�istallatio�i is nat performedin accordance with the �anufacturer peciftcation s, �11e is an f�icreas�d potential Fo � a�apo b af f ectthe cancrete slabs and �loo gover C �' �nost ef f ective�t of reducing the pot ecltial f or l�o�s �a transmissian ��i�roug cocicrete d��•ade �ild be to � the concrete �irectl on the s��r�ace of i�e vapoi��►1�entbra�ie �v�ver, his �nethod r�•es a concrete Enix�asi spec[fic to �hf application with law�-ceinent ratfo n add�tion to �cial concrete �iing and a ring practices to �ini�ni the �otential f or concret� crack.s and surface defects. i� 17238 GeoSoLutLans,��ur. Froom/E �aio 5pecific Nlan .Tune 28. @!6 Projcct�1 �Bs4}� Tlle contractor should be f ami[iar with curreut tec�niques ta f uish slabs pouE'ec� �irectl anto the v��por barrier inemb�•ane. 7. Moisture��ldens��r u�ic�er floar coveri�igs has became critic;�l due to the �e Qf water- soiu�ie adhesives. Therefore, it is suggested that maisture sensitive slabs not be constructed during inc[eme�lt weather canditions, 7.7 Exte�•ior Ca��crete I'lat�vorlc I Due tlle p�'esence of highly �an surf��ce sails wit�in the prapase� de�ela�ment areas, there is �� �ig� potenti��[ for consi�e��able soi[ ma�eme�it a�id flatwork if conventiana� measures are us�d, such ��s theplaceme��t of 4ta 6inches of imporCec� sanc� materials placed beneath conerete flatwarlc. Heaving ���Zc� g��acici�l are a�iticipatec� to occur. To reduce tlie potential for ina�einent assaciatec� wit}� exp��nsive soi[s, we recomme�ld the placerrEent af a minimum of 36 inches of app�•oved select import mate�•ial Placed as enginee�•ed �11 beneath the flatwork, 2 MinirrEum flatwark reinf arcement f ar conve�ltional ps�l'ian areas shou[c� consist of N o. 3 (#3) �'ebar spaced at 24 inches on-ce�iter each-way at or �ghtly above t�e center of the structura� section. The flatworlc s�au[d be a mi�iimum of 4 inches t�ick. 3, Flatwork should be co�ls�ructed with freque��t jai�lts ta �law far movement due to fluctuations in tempe�'ature a�1d moisture content in �li adjacent sai[s, Flatworlc at doo��ways, driveways,ba and other are where i�ahg � elevation of the �vorlc is d��i �ou be �d to the perimeter founc�ation by a 'ttrium of � 3 reinf orci�igsteel�lawe[s �ced at a�naximuin distance 4f 2 inc}��s on��. �. � .WFills l. �ainin �Y�s �o be desig�ied ta resist �.teral E�ressures �itn �de�it soils an� gu�'clla�' �ad applied be�i�i� the �a[l �V recammend using the f�.te pressures presented in Table 5; �t��ini�ig �I �i Paaeters and �•e 7: �i �JVaI �ai tar� design af etaining �vaL � t�e Be. �'e �ti�e �e � b used fart�e �esi of a�tra ined retai�ling walls and the �t �e may be used f or the c�esign of se 'lr�ed retai�iing waLLs. Table S: Re[�liniug !t'1� Dcsih P�u�an�eters �ta �E; ar and G�Zditia�l� �it — �' _ i�•e —e, pcf � � �ive � (Y'KA) �lect �rt �eria � �f � � (Y'Ko} 6ct Impo�t�e � �t'rc � � (y'K�} �lect Impai-t�erial 306 Qnpetent Farm��tia�ial A�leri��l 406 17 17239 Geo5nlut�4ns,rN�. Elioorn �I Bpec I'lan �n Zg g Project No. 6tL(19 . L The above values for equi�alent fluid pressur "� 12"il]111E�tAi311 are � � �ining `� Mirafi 140N svall �avin level retained `� ` or cquivalent arfaces, l�aving an appeoximately vertical . � Ka=4o pcf surface�gain �l1 retained . �_ ��, �0 6D pcf �naterial anti getamin . — k� granular backfill material - rr �ered fill �— �0(� pcf � ; � composed S native soil •� ` ' within �11 active wetige. _ �� 5ee Figure 7: R�aining -- � Permcable�n Rack Wall �t at�d Figure 8: � � I�[a. �•f. Draiu Pipc �.�in Wall Active a�id Passive Wedges for a Max`1'oe�'ressure varies dscription of �kt location #5 tlie active wedge behind a retaining walL �;�,,,�4 � �ett�i«in W�II D4rai� 3 Proposed �inin walls hav�ng a retained surface that slopes upward from tlle top of the wa[L should be �ed foran adtiitional equivalent fluid pressure of 1 pcf forthe active case and 1.5 �of the kt-re &� forevery tiegree of�pe �lat�on. !� We recammend t�lat the pj'oposed retaining walls at di � have an appeoYimately vei�t[cal s►'face against tlie retained � If tlie peoposed j'eta�ning wa[ls are to hav� �ped surfacesagainst be retained�aterial the peoJectdesigners�ould co�itacttlle Soils Engineer ta determine the appt•opriate lateeal ea�tli pressure values for e ta�ning s�vall located at the 5ite. Clnyey Material Dmimsgc S�vs+Ic Leve 6uckfill Wall ° � . : Active� . :V��dg� _. i'ermcnls[c Drain Rock • :_ H Nat ta 64+ h-Inch Perf.Drain�'ip , , . .�• . 45°fP� . . 45° -�+b12 �� . FaSS1V� W�C��� 3+igiu�c 8. R4l��iuiug Wall ActEve and P�issive Wcdg4s 5 Retaining wall fou�idations shQld be founded aminimum of 24 inches below lowest adjacent grade in select import �'i[l or founded a fninimum of 24 inclies below lowest ad�acent grade witf3 a fninimum embedment of L2 inches in uniform competent f o�•matiana[ mate�•kal � observet� a�id appeoved by arepresentat�ve of GeoSol utions,Inc. lS 17240 Ge�oSo[ut�ar�s,in+�. F�-oom/ElVillaggio SpeciFic P€an 7unc28 2Q16 Proiectl�la SL09734-L fl coefficientof fz•iction of 0.35 n7ay be used between se[ect import �'ill and co��c�•ete footirtgs o�' �.45 may be used between unifot'm competent formational matet'ial and concretefootings.P�'oject designe�'s may use a maximum tae p�'essure of 2,4aD psf fortlle d�si n of r�taining wall footing�oundedin select im�o��t fi(1 and 3,606 psf Corfaotings � faundadin unifa��mcom ete�it far[nationalmateria[. P (>. For earthqua�CeconcEitions, �'ataini�tgwalls g�'eate��ti�an 6feetin height sE�auld be dasigned to �'esist an additianal seis�nic Lateral sail pt•assu�'e of ZS pcf equivalant fluid p�'essu�'e for ua�'est�'ainedwal�s (aclive canditian). The pressure resultantforcefra�neartE�quakelaadi��g shauld be assumed ta act adistance af�I3FI abova ti�e base of tlle �'etaining wall, wi�e�'aH is t��e heigE�t af tlia i•etaining wall, 5eisinic active late�'al ea��th pressure values we�'e detecininedusing the simpliFied dynamic lateral fa�•cecomponent(SEAOC 2010} utilizing the design peak ground acceleratian, PGAM, discussed in 5ection 5,0 (PGA� — D.541g (5ite Class C)ar PGA�=0.4�7� (Site Class �}}. Tl1e dyr�amic increment in lateral eartll pressu�'e due to eai�thquakes si�auld be considered during tE�e design of�'etaining walls at the Site. Based on i�esearch p��esented by Dr. Marshall Lew (L,ew et al.> 2010}, Lateral pressu��es associatecE with seisnlic f arces sLlould not be applied �o restrained walls (at-t•est candition}. 7. Seismica[ly incEuced farces on retaining walls are canside�'ed to ba shart-tet'm laadings. Ti het'efa�'e,when perfot•iningseis�nic analysesforthe design of retaining wall faotings,we ;Ili �'ecainmendti�attlle allowable beat•ing pt'essure and tl�epassive�ressure actir�gagainstti�a ;� sides of t'etaining walL footingsba inc�'easedby afactotvf o��e-third, 8. In addition to ti�e static lateralsoit p�'essure values repar�ed in Table 5: �tair�ing � =�1 �ign �eters the t•etaining walls at the Site si�ould be designed to suppot•t �rn ;�I cEesign live laad,�h as ft'omvehicle and€�tri�r� st�rcharges,�tc. ta b supparted by �'� the �l ��'i � c�s�t vei�icles are �'equired ta ape�•ate within IQ feet of a �'etaining waLl,supple�ne��taL p�•essut'eswiil be induced and should be� inta accauntin the design of tE�e t'etaining wail, 9. The recommended lateral earth�aure values are based on tE�e assumption tE�at�'�nt ;� � � rface dt'ainage will ba �ded bei�ind the walls ta pt•event the �¢ild of �astatic pressure. To acllieve tllis we t'ecommend ti�at agi�anular C�er mate�'ial b �cecE k�e ind all proposed wa11s. �Ci�e blanket of granula�• �r material sho be a iup►im af 12 inches�liic and sliould extend from the t�c�3 of the wall ta �, ir�clzes fram the �nd surface. TE�e top 12 inches should consist af moisture �anditianed �oinpacted clayey soil. �tE�er spread nor wail f ootingssi�auid be f aunded in tE�e granular l�e�' �nate�'ial used as�ack �0. A�ch diamete�' pe�'�aratedor�b drair��ip��M D 7S5 �C sllould be titstalle � � nea�'ti�e�trn af ti�e�e�' �tan witli�t�"ans facingdown. Tl1e di�ai��pipe si�auld j (�� �n�erlain� at least 4 inches of ffie�' p,,� lnateria and shauld��ht to disci�arge in � �tably �ted outiets witE� qde uate �dients. The �e�' nlaterialshould cansist aC a ciean��aining aggregaCe,such as a caa�'se aggregate�li � tlle retaining waLl is pat� ; of a 6�l �datian ti�e d�'ainpipe must be placed below fiisi�ed slab ��de elevation. ' � i i 1 19 17241 : r.11E�05L����L7R15i�ING. � :--..�x F'rootn/El Villaggio SpeciGc PlaEi June 2R,20I6 Proiect 1Vo. SL69734-I I l. �'he filte3� �at �-�al hould � e�lcapsulated in a permea6l geotextile fabric. A �itabl �erineable geoteXtile �abeic such as non-woven fleedle-punched MErafi 1�4QN oe equal, may be util�zed to encapsulate the retainiflg 6�va drain rnaterial and shou�d conforrn to Caltrails Standard��ecificat 88-1,03 forunderdrains. � Fo�' hydrostatic loading �mulditi (i,e. no free drainage belli�ld retami��g wall}, an additional loading of 45-pcf equivaient fluid weight sllouLd be added to the acti�e a�ld at- rest late��al earth �rress Tf � i necessary to design retainEag structures fo abis�erged condikions, hh �owed bearing and passive �ressures shouE be o�dl by 56 �nt. In �dditian soi[ fi•iction beneath dl base of the fo�uldatiofis should E�e �e� G Precautions should be taken to eflsure that hea�y compaction equipiilent is iiot used afil�ace to wa[Is, so as to prevent undue pressure at�, and �novemef1t of the svall I� The use of �C�ops/Em� barriers �ould be aed for any basement ronstr�►ction and forbu'tldiflg �vall that retata earth, 8.a ADDITIONAL GCOTECHNICAL SCRVI�ES c`�'h ��ecoir�ir�endat�ot1s contatned En tllis re�ort are based on a liis�ited number of borings and tre�lches, a�ld on the continuity of the aa���e coi1dEtions eflcountered. �t�Shiax asumes that Et �t be retained to provide additiona� serv�ces during future phases of the proposed �j [�'ese ser�tces would be �l.tov by �tEof1s, hc as ��ed by 6�t�n of Saf1 �. �o the � �BG � dbr indust�-ystandard pe�ctE i�ese ser�ices wouLd be in additEon to those included in this � por and would include, t�t �e flot limited to, thefollowing services 1 �onsultati during �lan development. Z �n review of�ng and ��nd dntsi �riar to cd��at and at'eport ce��ifying that the reviewed �lt are in coflfo mance witkl our�eatecit Ecal recammendations 3. Consultat�on du�-ing selectio�l aiid placeiilent ofa late�i�lforcing �1 g�o ��x�t 4. Ghst c�ion inspections and test'tng, as ��equired d�u-ing all �d 'tng afld �avating ��ations beginning �h the strEppiag of vegetation at the Site, at wh'tch time asite �neetEng or � meetiiig would be aqa�e 5 �ecia ples�n �s �ng construction of reinforced �oncrete s�u��al �taso iiEgh �h�en tiog , g�poX �ntbed of threaded rt� and I'�lI1fOCCl11� steel and �yeldi of �'u ural steel. 6 � of c�st re�orts certi�in that buildiflg �d peparation and �m � �ious are in pna�or i� o�ir��I�nical ��nme�ldat 7 �paration of��h i�ion reportsas required�uri ca6iosl: S In addition to the c�i��f Enspections listed above, section 9P6. 6 of the � CBC (CBSC, 2013) t�s the follawing inspectiofls � �it �'tls �'gineer for i�dt �i �1� greaterthafl � inches as shown ifl �la 6: R�i ed �4rtification and I�stio of�ils 20 17242 G�a5alertlons,in�� Efoom/ i�'ilfagg f�{�c P�n ]une 28,.� __ Proiect No, 609734-1 TtZl�le 6: 3�cc�uirecf hierific�t ftll(I �iS�]L'CC161i of�'i iCantiniEous Perrodically�'� I Verification andInspection Task D�Er'r�ig Task Dt���ing Task L�sted �ted L Verify �oealt be[aw foatings�r �dequat to achieve ph X �ea �aring capacity. 2. �e �tions �r exkended b ptblpe and f�ave X ' �lac prope materia[. 3. �-forn� �catian and �st af�dntco �i aae�Ls. - X 4, Verify �e af prop inateria[s, � ad ��e�ickn X �uriu �[acem nt and b�npac of l��itr fi[l 5, Pr�or ta pfa�nt af �antr �L[ ��� ab-grade and X �r �at s has been prepa��ed pcb�p 9.D LIMITATIONS AND UNiF�RNiITY �F COI�IDiTI�NS I. The secommendatian af khis ��epoi�t are based upon �h asumptian that the sail sanditian do nat deviate fran�d�e d'tscLosed �urin our �idy Should �n srariatian or iu� condilians be acountered �urin the d�.velop�n af the Site, �a�a Inc. 6�auld � datif �rnmediatel ai�d �eoSol�ltian Inc. � provide �ppl ntaL recammendatians as dictated by the field canditians. 2 �'hi eepoi�k s �d with the ��[n that it is tfte �� of� owner or h�/ preseutative ta ensure that�h infarmation and txsca�nmendati elontain fterein are �tou to the aftent�oi� af� arch�tectand engaer forthe p��oject, and iad�¢lp inta the p��oject plans and �ecifcat�an a. �h owner or h�l ga�i�sen is �ans ta �ne lhat�h �cessary steps are takeu ta aee that�h cantractaE�and abntractars caE�ry aut ach reca�nmendations in the fe[d. 3 As af tlle presen date, �1 lindings of fihi repo�t are va[id �o the propety dudi t� the �a of�m changes in the �Zs af a �ppe can occur �ether they are due ta l� �sses or to � �rks af�nan Q fihi ar ad jacent proper�ties. �'ee, �i repo��t�o ld not b elied upo �' a periad af 3 gars ei�►aut our rev[ew Q �b it b��e or s it�ble f�� �n p� erkies athe than fi�a �a �vever �a eve�t such as floods, earthqualces, g�d af the d �cent �rti and building and �nunicipal code changes tiou render sections af this repo�-t inval[d in � than 3 gar 11Has-d3f- I�LsISL09S00-S099441SL097341-NfadonnaFrooinRancliVEn6nnee�ISLa97� I NfadonnaProoinRanch-Preliininar}+SF.R.doe 2[ 17243 �e05oIL1��01]5*INC. REFCR�NCES G�eo5vlut�ons, ���. 17244 Rrr�ri�Nc�s America�� Sac[ety ofCiv[� Engi�ieers (ASCE}. M��»in2zen2DesignLoadsfc��•Bacild;ingsa�zdOthei•St�uctur•es. ASC�; Staiidard ASCE SEI 7-QS I�icluding Supp[eme�it No. l, 1801 ALexander Bell Drive,�eston Virginia 2[}[91. 2006. �ssessor difice. Gounty of San Luis S]bispo Sa»Luis Obrspol�icinit}f.Qaak D67. Page 241. Caiifornia �3uildiug Standards Commission (CBSC). 2013 Calr.'fo1��7iaBu��ldr.'ngCode, Califo�•niaCodeof Kegaclut�r�ns.�fa 24. Part Z. VoL 2. Califarnia Qui[ding Standards Commissian: 3an�ary 2013. DeLorme Topa US.,4�.�. Vees.8.0.0 Computer software. �}eLorme 2009, Microsoft Windaws 7, DVD- ROIv�driv�. llibble�, Ti�amas W., Jr.. GeologicMapo f't17e Pr.'s�no Beac1? Qtradrangle �bbl Geolagic Center Map Nu�nber DF-212. Santa Barbaca Museu�n aFNatuca[ �I�s y: �Ll @06, 6t af � ll�p�i�nrtient � �st �Iation Ccrlr.'forniaCode of'Regiclat;��ns. Zaai � ition. � � �a 4; llivisio o� �dustri 6�a 6�a�� ;� �st �a Orders. At�icle �: �[U �'. � of�j Depai�t�nent� Transpo��tatian. Starrdai•d�Specrf icationsStatefi �I ia � ent oi��ti�ao Cent��al P� tion Distributioii tJni �[L � IiI t� �t �[agi �ye �logic �za �cien � U.S. Sers�r�ic Desrgn Ma�s, �giim website. �anuar �, �[} �rl Gd Sta� �i f�ey M�a pVi etiv �eol ogr.'c M a pso f T l�e Nati on.�r► �atioii. � 26 �g �a ��t� �gmdb.us � � GeoSolutions, in�e. 17245 APP�NDIX A �'ield Investigat[on Soil �sification Cl�art Boring Logs Trench Logs CY�OSOIUt�Or15, INC. 17246 F'[E4D iNV�ST[CAT[ON The field investigation was cond�.icted May l S-I9 & J�.ine 7, 20 l 6 using a Mobi[e B-24 dciLl gj and extendahoe equipmenl. �'li surf��ceand sub-su�'faceconditions weee stiidi�d by advancing foiira�#iory borings and s�ven exploratary trenches. Tliis exp[oeatian was canducted in accordance t,�h peesently accepted g�c�t�ch�iica� e�g�neeeing procedures �ant witll the scope of tt1e services authaeiz�d ta �easolutic�lZs inc. Tl�e Mobile k3-24 dri�� � with a s�x-inch diamet�r sb�inh cantin�ious �knt auger bdr foui� exploratory borings ar►d the extendahae advanced seven exp[oratary tE�enc�s near p11 approximate �cation indicated c�n Nigure 2: 5ite P[an. The dril[ing and field observation was �arined undee the direcCion c�f tlle pra ject e�ii�1 �i� af �o[u Ine, maiiltained a iag of kli sail c�nditic�ns and obtaiiZed soil samples suitable far[abacatary testing. The sails r�e ir#Ti� in accordance t�i the�Jfi�d �il �ssificatian �em. See tlie Soi[ C�ssificatian Chai�t in fihi �endix � adard �tet Tests witll a �eh i�i�s diainete� standard split � sampler � W1�L1011t lin� (AS"L'M �15�6 99} and a th«e-inctl s�� diameter Madified �ifa � split tube sampl�e f� �iners �L' �3550 4 �el' perfaemed ta abtain � �an af the [�si i�ensi of the soii and tc�el� �1 �bsei-v tian af at�ast a prtian bf t soil b�nn Sai[ �p obtained with the�t � �ler are �ta �r fu��E�er�ei'vation and �stin The �i�rs �tan al'e d�'ive by a �},(}- �n fee �all 30 ilcltes, Tlte sample� is �iti seated�i inches ta�trate � loose u#gs ad is then d�'�ven an additional 12 inches witlt tlle 1'es�ilts�'ecorded in tlle�I-ing Eag as�a[ues i�h area tlle numbe of blows per foo�t�red to advance the�in tlle ��h 2 's�e '1'h� CA samp�er is a lal-ger diameter samp[ee tllan �li s�elnd �' �rn witll a two-i��ch dsid� df�r and �i�es additional materia[ for a�e 1 geat�chnica[ testing �i as in-situ shear �d uns�lidati �st t'ther samp�er �n� �ed in the fieid invest gation lzt � tt� obtained �m gsin the CA �a �vil b �1'eate t�tan that af the �'. The �a[ues �o �n ca[Lected gsin t�te CA c��Il �J� ��11 e$�ted �a �' �ai usil��a COIIVOE'SEQCI �aCtQI'thaC �l vai-y frro �a�it (� to U.7. A �aon� used assian fa�tal'is D.6 (Z 3 ' Moee itif�u �ut at adardi samp[er can � �nd ii � �BS and ASTM�355a �ed l�x �p �te abtained �m �s �elvelo c6aag bo�'ing �rations. The ��il samp�es are �eted t o�'c�assitication and t� purpses and may �'epi-esent a�#iure af soils vuitlti � noted depths �avei-ed �e a�'e placed in transpoi�t containel's and �n �a � �borato�'y fo� fithei' �icrr� ar�d testiiZg. drgs �f the ����g tlle �te �e � and �escE�i �ian af� �co �ails �[ica g��i�ygic �- ed �ilues ad tlie �6ts af fj�bocatae tests aE�e presented in this �endix. Tlle bgs represent the p�lte� ation of fie[d [ogs and field �ests as wel� as the in�el'polation of sai� sl�tia �n �pl �' �6ts af labacato�y obsel'vations and �est a�e a[so incl�ided in tlle b�' lags The G�ica�ian lines 1'ecorded in the boi-ing lags rep�esent tlle�¢nxima�e boundaE�ies b�'n � s�iace sail �es. �revei- the �1 transition between sai[ [�s � � ���, or��r G�eoSolutions, iN�. 17247 SOIL CLASS�k'�CATI�I�CHART R[AdU tl[1IJ5 I.A410�� CA554P1 CATfOY CRI'PF.RlA 56RnO'S ra�nwrzY DIYISLORS C�igx le Y 4od Cy6[wec 1 and S G�p �Yd�sraded 6hv ad gravel•sand 41ca �i� (la paxlur liu�mrnninc GRAV�1 S �0a� Poorlygrade�tarc ad �{ Kol"og botfouat forGW E r�iztures,6�l G 6 5m dS � SD e8co-u M1i��� Emits�lo-heto-wT Fn o jf� 6v � o-nNo Erar wit�in j�d ��i�i�q Gh� ��Y&� g«��'eE-s�d-ilisri�ctu 4(.9¢�ns evc �or R'/n -- - — �nn �ienirr u s�us F++" � r��,�ispi �v v+ h �adj�1 ^ y.� �� �, � o-��� e�J drthan 7 �e gFiyc graccl,�vel-sa mlxlnr � • � !Y erad sandx,gravlyda¢ Iful or ,� �r YE On �6c1Wc land3 ShV noGnC �I aMn �k � Ih Ya �ct �'oLgn hW i Fa 8f B � � B oano fin� ad df Yn SW sfc Aa ch g kimi6 pt be€aw71"k o-rpl�sliGj SM1[ � �aQ FN miztucs Eaa 's D! 4 � �' �° ilx !ss lian 4 � m}sevc � d' � � LU�[ erg Yi[ po- ►r n in ■d My SC � ds, il ay mos[ imd dt N�a l Yg N�s cf En Sand 4r � ln a� 9il R 4or�e bcl Rin M1��• � p y1a} fi sand 67S AkD6 Y Irtargaoi claysaTL lom�i � li�niilss� 56 �orgin[o-il PD 7ad pt onorYc T 6n•� EL 'p[asti�y�fa�• s}s, �n cp}a d�y �Y�� � I�INIifG11 6f] Be,S 9irga 6o L ¢ov �I.L (noLdr�< 65 6G ��a tli ad � iEly gka 6 b So%P NI F4 CI 20G f5[ CIIy sic��c � sail elot W T o AIH q;an E� io�s orJatomam s finem o�k k sIm SILQSA DC6AY � 6�i 50ar�nore � nieail Plo onora6oveR1 I�ne IC 4iarg Glg}s o �fasicity,C qk o�sac 6 LL�en aayi.� pa�aa�< o oK p�������I�Aa 1�8[ILG �i 6� k��r Q �a P�na c mai�e. 16 inrdar,ad irgan Pl' � �muc ad ! �h g� sils kl'iu a�e�I�aSrk 'artic� llsaipass�hEDDfa eve. 6 grave6sad a�s wiih pe S ¢% �ncs useofdua symlrolsis�ui �� 13A5EDON�CEI�TA DIP RII�ES (I.e.GIY-GM,Si}v.(iC',4PGM,orGP-GC} Leasln S°/u,P�ssNn 20�TSmmjsicv$ (� �'+P SW,SP �"Ifpia plaslicityidEx e bahv 0.and 7 d [plotsehov trlor tltnn 12%!�s N 206(75 mm}! G�cc,$M 3C h "A"iine,h ttua F�pm �L CLML)a required. 5%,.r2%Pass No.20D[7S mm)ccva �or rlitle Cksi6 caEion u�n lioe IhenEu�Iryn�bW9� Gni u«w��r:a � as ofY Eymbo G41YS S't'EI�CY � —. SZ'ICFAC'fk I s rs,�nu ri.��s�+c �+�� �u45n CHARr s�is i'o�rsc�r• �rr �� � _ Fvrcr�ssrvc,truurn�o-e„r�eaafrsno _ f nR.cmcrrwero��s�.emr��tr�: �, I I�LKYS Q-[4 6-2 I SpFC f3- 2 2-4 I I FEI�M 2-I B �° —-' --- t'- F I _ 7I I ` SiIFF ¢ B-6 g �rxlottedGs ava t I... A I. Y@R TI[�F 2-9 1@ ��P - � _ ' ' _ � � � L IBqWlMB w d dl CYm� l p Eqfe�6n uf 0..LMB y P1=073(LL Z01 kl1:LATEYF.e 6l' *, _ ' ' _— ' — �� ' 1 s�vus,�t�• as an ar.o�v � matxs� ic s �aa€� " io - - , . _ _ � - VLKY�OSC 0-J :�� cia�� _� �� I �U45L' 4�o ''' � � MGDIUh161iA1SF D� 36 � a +o ra u so- w w 79 A e �m 9b 56-S6 u4��auim VERY6E�FSG Ovcr56 Drilling Nn�cs: + N�niiUcr of blo�ysof u 14U-pnund hammcr d�i 30- inchcs�o Jriv�a &�ch a.n. (4-318 inch ¢ pli l 5ampiing�n bCowcnunls �P af5amples spuun(�STM D1586). a �bmia WSod fied -aumb of hWs pe f��ot X-Sainple ++ Lt2canfined cninpreS�jye sEreng[h in wntYsq . a nC aY4D poundhammer�aliin }0 inches �T -Bnd Penclrnl�vn �en ed Iry I.�v iory �s vr appruxm6 4 b B A Bane d -ambe �l b5Y p � -Ck3forria Modifid lhe rnd paneirauvn es �65 DISB6),pock l2 he of a14U �ou hym falling 30 H '�c Gauge ��s[e �rv vreuaC alrs r�aiiun inrnes � eock @n eme �t �Isq.�i GeoSnlut�lons, �N�. 17248 � � � �:-� _ �� . i 220 Hig�t Street,5at� Luis Obispo, CA 934p L �ORING N�, #3 102] West Tama La��e, Suite L p5 Jo� No. ��,a9734_ � Sa�tT� Maria,CA 9345� �� � PROJECT 1NFORMATIpN DR[�,[.ING iNFORMAT'ION y i PROJECT; Madanrt�- f'rvvra� Rar�ch DR�I.C, R[G: Mobile �-24 3 DR[�,I,LNC [,OCATION: See I�ig�ire 2, Site Plan F-�Ol.,� DIAMETER: 6 �nches �� DATE Df�II.,L�D: Ni�y 18, 2016 SAMPI,ING METI-IOI�: � anr� CA � L,OGGFD BY, GTV F-�OL,E �L�.VATION: Not l�ecarded '� � Depth of Grau��c3w�ter: Not ��teai�ntercr� Bori��g Terminatec3 At,1p.4 �'ee Page ] of 5 x �` � p' �' `�c� f, F- >' � � �` C} 5 .°.�_- q °. :� \ � �, SOfI.,DESCR[PT'FON � ry � z� � � �'j, �� �- �J � � ,� W � O� d � � '� � `� � ,� �` w �, � F� � ,��' � � w � � x z 4 w u� a � � � � � " 7 �;�` � �.� � �'Q`� �' Q zo w +� � '-] "> W � V u � ~ 4`U � o— ------- -- --- CLAYF Y Sr1I�C3: veiy:lark grayisly Growii,dry CH �-_ � ��-- A 28.7 k67 79.6 31 -2 stiF�F � — $P"I' 6 9 �T—. . . �-_ ' -J CH SA�II3Y CI.,AY:d�rk bra�vn,dEy �— -4 �. -\. � _s . - * CA 8 S f10 stiff \ - � �. . \\.. _r � — -8— \. � —� stif� \ SPT' 9 9 -1— �. - \ -10�— - I -12 -I} -14— -I -16 -fi '— � � -IS'— -2D �- _ � � e� � �io�s I �. � �r � �o � � � ' ��0 H€gli Street, Sas3�,uis Ubis�o, GA 93401 �lN �-2 ' _ -��-- — ��1 West'l���r�a Lane, 5uite 105 �oB No. � ��l-1 Sant� 1V�ar€a, CA. 93454 PR�JEC'T�N f�'C3RMA'1'IC?N D�t1L1.,3NG�NFpRMATiQN PRC}JEC�I': �ddo�ln - F'oa«t . �anch URILI.,RIG; M�b'tle B4 6�11�iI,LI �1�GATIp See Figure 2,6€k B Qpi� DIAMET�It; G lnchc:s U�',T�@.�EU. . Ma,y �, 261G ,SAMPLING METHC3D: SPT LDC�GEa I3Y: 6�T H�LE ELEVATCUN: �Tat Itecurded � � Depth of Circrundw�Cer: 4,0 Feel �or€ng Tej•miroated AC:r�6,U Feet Page 2 of5 .� � '� �. � � � vR q' � U �. � Z � '� v ,� � �] °- ,'� � f" � SO[L DESGRII''IDAi c7 � '� .� � � �, �' O� `°-� C� ,, 4 ,�? w `� o a � � y w z r=, 4 � � �L 3 ��� w � � � � ac��-u w r� � w � � � ,� �� �� � ° � ��—�' � �-�v� �U � � o�-- CLAYGY SAi�3p: ye dark�y Uro�vq dry � ' � ' _� ��� -2— _ _____ �T� STANDY CLA �ark 4rown dry � �-� -3 _\ � ; firm . . . 5PT 5 7 _\. -5 "\ � —\— -6 � B _\ SAi�i[}Y(:LAY: dt�rk olivc brown,very maisC -7 —�-- -S ` s[if f —\� � ^�T .. SP'C S 8 i \ I -10 � _._ - PiF�?Y CAY: biack,vcEy�tt • � , -ll �\.. ' _1z �\\ � . �`�— j� ���� • SPT l6 t5 F-\ -t5 . . �\. -tG � CH ,.. SAIrfpYCAY: dlrkf�re �own witlsgraveE, r, _L7 sear �ed � ` -f� — stiff � � —` SPT S 4 -l9 � � — -20 � -21 �._ . � _2z _\� 1725 -23 _C _ i • t '� � � ' � i � 220 High St��eet,San Luis Obis�o, CA 93401 BORTNG NO �oi�t}. � �oal weSt Tz���La��, st��fe los Jos No. �L09734 Santa Maria,CA 93454 � De(�th afGrauad��ater:4.0 Feet Bo��ing Tei•��iinatedAt 46.0 Feet Page 3 of5 � � � � ° z � � z a � .� � � ,a �� a Q � �y �� z� � � �-, v, o �y � a Z' ,� �'``� Z �.-, � Q SOIL DCSCR€PI'!ON � � Q � � � � �w r`~C�� � � �a F-�. � O �. U�� !.t! �� ¢c� �r? � i -. �., ��. �' a z �z `'-' z r� � '-� `n ��° � �U q Z w Z �. e T\ -za �� _� -25 �H — 5liNi7Y CLAY: das�k yeilotivisl� Us�owa,satikrated � ' � _�� —�\ �7 vciy sf€f f � �\_ -l8 —�`— . . . s�T zi ib -z� � _� -3U � _� 3k . . ^�� -32 . . �\� -33 . . -34 -�\ -S5 ��` , 36 -\\ -37 �� � -38 _�� -39 , _� -44 . . r�. -41 . . . �_ _ _�}� . -k3 J�, -44 ^�` -45 ve�y Sticky �-�� � _�6 FRANClSCAN CQiu[PLEX:serpcntiuite& SFT 5011" meEange,metR volcanic,very�veathered -A7 -48 �9 17251 -SQ � � �-; s ��=�:��-�� 22p I Iigli Sh•eet, Sar� Luis Ob�spo, CA 43401 ���G ��� 1021 West Ta�na�ai�e Suite lOS JOB No. ��,pg�3�e Sa��ta Maria, CA 4345� � � PROJECTINFORMATION QRILLINGiNFORMATION '' � YRUJECT: Madanna - Froom Ranch DRIL,L,RIG: M[obile B-24 ; � D1ZIL[.ING LOCATION: See F`igure Z, Site Ptan HOLE QIAMETEIZ: 6Ir�cEtes � DA'1'E DRILLEQ: M[�y 18, 2016 SAMPL,ING M�THOD:SPT and CA � I.OGG�D BY: GTV HOLE ELEV 1�'ION: IVot Reco�•ded � � �e�th of Groundwater:�. F`eet Bot'it�g Terminatec�,f:10,U i+eeG ��g� `���� � � �� w w ,� � � � � jx � � � ,. Z p z c� 3. : � z � � � q SorL o�SCRIPT[DN a � � ,`; � �" �`z � � �� �. �� � � ��' ,� � F" � w � �-' �t`�Z � w� �,' �' ;� � � Z w � ,� ti z w z 4 w � � � �� � � o �p S 4 w� `�� � a . � FAT C1,AY:very daE�k grayish€�rown,dry CH -� g l&6 94.7 48 . �rrn -Z �PT 4 5 `} CH . . $pl�iDY CLAY:dark�live brot�n,very rnoist -4 �\ -5 f�n3� \ CA 6 6 -G-- \ � — \_. -7 � � soft _\_ 1 -& —��\ SAT 2 Z -9-.. . . -\_ -!U -I 1 -12 -13 -l4 -35 -IG _�7 -k8 -- 17252 -l� �n � i � � � r�.� � � �' � ? °' ";� ' 220 I-Iig13 Street,San Luis Obispo, CA 9340I BORING NO. � I021 West Ta�na Lane, Suite 105 10B NO. �L09734�1 Santa Maria, CA 93454 � PROJECT INF�RMrLTION DR1L.,L.,1NG 1NF�RMAT[ON � PROJ�CT: Madonna- �r�QQrn �ancl� Dftl[,[, R1G; f!'fobile F3-2� 1�R[[,[,�NG LOCATIDN: See Figure 2, Site P�an HOL� D1AM�T�R; G inehes DATE DRfLL�D: May I8,2016 SAMP[.,1NG MET�-IOD; CA and SYT [,OCGEI� �3Y' GTV HOLE ELEVATI�I�: I�lcrt�orded i � Depth of Gi•oundwater;2,S Feet �3o�•iilg Termiilated At; �p,0 Feet E'age 5 of 5 � �' � �� �, � R � � � � x � �, � o '� u 3 � Q o � � SQIL �GSCR[PT[4N V � � .� ;� � �, �}. O�^ �- H 4 p u! � � U� � � 2 ,�,� �w ''Z "'� � q � � �,??„ :� �-.�n � v}W Q;�, j �' ;� `-� �� � � Q a.u"� � q i<�a �O 0.� I `4 � `' 'O � U E � a -- -- — -- -- - � GLAYGY SA�FD: vecy dark browsi, very n�oist �H � � �� -E —� — sof l �—, Z . _�_Y . -3 �-f -� -� _ . _�-T . � �5 GEi CA 3 3 E SANDY CLAY: dark brown,very moist —\— ! � . . � _\ i -7 . —\— g \ SPT 6 6 � _9 �rm - _\, -ia -u -�z -�� -��+ -�s � -�b � -17 � -is � -19 I 172 -2 0 'li r-a -:-.2 1-a r-� O l llG 4.5�;...I._ 0 Q , [z 5 �S II "II��-3.4. FT. Tll� k�l. `F'D�r_ .D Fi. «ru�,u,�t4�i c��,:��.umiv,, ss�p��, 0 0 v��w,��,�� U U 0 j Siky Cl�r S3on�G.�c f-_-'- Stl[r Cla�'- k Grnl�'�.dn�.�ob6les m;fidi.uneicr. ,9 wCd{ah 6ra4�z,dn� vrdd��:F.hro..n.J<c cnaea�°�',Momeoe��Fomv:�tio�C3a.ls-ml jl C ' � Compl,�(K1Emr1 �'� e:vin�cli���r.R�ihcred Mey.��u' c�� _ > > J S S J � , I � I � � �.- t�- �. � F- F. � � � � � � � � ,. �" S� �`'� ii� � l.Cl Ailuvium(Q.�i) j.r_ t�anei�ran[:nmplc��F7fm��7 Lz � krane�xcane'nm[e��K�1m�] u. pran:i� (:o�n ie.�x�i) � w 1� 5;�,.��. Cz. � Mcta.�olcar.ic y ha:d � �=' r�P9c P l r 6 y�1 tl c:�'7� �1� �, z y .�nw,.o�c�n"6cdrocx y Or_ kr�:ui o w��h coaplcc'p:bo�u an. .�en���xsthsxed,d�. 1 Q 1� 1 U � �1� `w'�R 1 Q � z�U liSldcrs �� � � 'T' .,/y "t" .''T-. � ^ � � Q �1 � � �"' � W q II� . � Q Q C] — i s 1� 1 s t s �s �; �s _:,,���,v.,,�, � �s 0 5 1D 0 5 10 0 � l0 li f?1S��.NC�: DIS-�-ANC�: D S,TANC� I�i �N E� �N FEET �k-�ET ',i ;I �� T-4 T-� T,6 2U 20 �i � TDC�$-0 NT. � Q 7DG�3•fl FT. � � lll��.j F'I. O u,icu,��.�„�ck:i cosv.;�c�a4`� I S��il� il}' Y �M�:a�W.:�, a��s:a�o,zR AIIU��r m{(jel) �� ���o�si I dPl�1:i�R�n,:li�11[�RIfInItCl�lh]�cbbfvsol �� �] I� o s 70 I� 5 5 5 5 � S Di 5�laN�E I! � �� h- � F r- F E— r,�a w w r.�'v u w ,,I F:.. L� Lt. rcar.crscanc�a:tpIcx�KJlmel L:+ [,�. r�uoo u,�;Cw�ryV�s{Klfm�7 p- NICW��n�Can�caiid5��m�tc .z�� 10 z z�� �� Z �},U ei��M`��lhe[dc �Q z �li � � � �,- � .... 0. E,., �" ?-� f-� �" � +� �- � n L'J �l � � � p I 1U 10 10 10 10 30 j�'i 0 � lU 0 5 10 0 5 lU �I DIS7'A,NCE FJIS��:h�C:E D]$.7ANCE 1 1��E�T l�, .�ET IN�EET ; i: u i � ��X Wt���A1L�g AYY�a t�`+�ONA�GEOC�G'� � �� �1.V'�Y ���� �`V'�� .. 22L�I�agla Street � ��µ���";� � l a �ERr�viEv Jal�!.r�a5 V b�5 o CA 93401 EUG�NEEWN� ' � � eeo�acui = MA����f�-}'R������-M �.�a�a��'�� � (�US}54�-8`i39 t=ax:(805)543-Z17] �Nr��:cPu"A� SAN I,U[S Q�3ISP0,C.ALIFORNIA SLUJ734-� APP�NDIX13 Laboca�ory Testing Soil Tes�Repoi�ts Geo5alut�nns, i�ue. 17255 LABORATORY TFSTING "1'his appendix, includes a discussian of the test pracedures and the Iabocatofy test results perfor�ned as pairt �f this �vesCigati The purpose of the Iaboratory testing is to assess the engineering prope�•ties of tlle soil rna�erials at the �ite. The laba��ato�•y tests are perfQrmed using the currently accepted test metlaods, wl�en applicable, ofthe A�nerican Society forTesting and Materials (ASTM), U nc�isriu-E��d an.c� c�istut•bed bullc sa�np[es used in t��e labarato�y tests are obtained from various IocatiQns r��u•ing the coux'ye o� the f�e[d exp[o�•ation, as discussed in Appeudix A of this repQrt. Eacli sainple is ic�entifi�d Uy sarriple lelter and dept�1, The Unifted Soils Classification Syste�n is used to class�fy sR�ls accorc�ing to theAr �1gi��eer'tn �� � �rious laboratory tests perforined are descrtbed be[ow: UxE�a��sia� �ndex 6 �'�AS D4829-D8) is conducted ir�ecorda with the ASTM test inethod and th� �i�� �ildin fide �tandard and are �or on pesentative �ku and I�ed ai�o ain ples The paep 6 this test 's ta �[ ate �ansion potential of tlae site soils d to �livations in �istu �nt. The yainp[e �eci ace �lace in a consolidoineter, surcharged der a �- �e�rtical �in �s and tlaen inundated with�te �' amount of expans on is [�cQc ed �� a 24- k�ar � 't�h a �i [xid'tca �' expansion i�de is ��lated �a �eterininin the differencebetween 6�tI el initia[ �ei hk of t��e �eci divided E�y t��e Riit ��i Liquid Limit, �la � �, el �a �ex fi �o �1STM �]4318-DS are the a+ter contents at aerta ltig at•critical g�a [� �c���i fa�i� The t�id lt� (LL or W�} is t�1e� Ila of i,scous �, the�ic In �.P or Wp) is � lower imit �f t plastic fiage of c[ay and (�stic �Zde �'I a l�) is a tr�;e a�ant�x' �ct�� �ece � soil is plastic. �' Atterberg Liinits are pqtf or ed n � that�a €�een screGned b ��na �y �ateria retained on a�1 4D sieve The 6t} limit is deterinine by p�i� �'ia in �ich a pa��ion of tlae �am le is �ead in a E�cass ap, �tled in two� a grooving �r�o and t�n �tic� ta �YY �hei' Gn t��e �1oc caused E�y pp�ted[y �g the p iu a �da t� �hanica �. Ta determ'tne the �stic �a �11 pot�ion of plast'tc �o 'ts � pessed tc�t hz• and � into a �/8-inch dia eter thread This process is aQ tinued until 8�e w �a�� af�e sa�nple i5 reduced to a poin at l�ich Ipe thread crumE�les ad � no �n E�e pressed tagether anr� �a The t�t�►' con of �1� �oi at this �Zt is ceported as the �asti i1n The p6�. ty�i i�ude is calcu[ated as the� erence�n tl�e i�id li and the�stic limit llire� Shear � � �a �T 6hso dat � �ns (ASTM�4 is �rforined on ula�d and �'e�lded pbes r�sen of tlae foundation t�terial T��e samples are [oaded � a pi�ete�• ��ot'� stres dr► �qlbmer in s,ter util saturatton is achieved The � are th�n a�le hot•i�liy at a �dt �in rate allowing pat�tial c�t inage The s[�ear stress �n t �e is dcot•d at �a� s�trai Ri�er Thts test ii�r be resistance to �lef Qrmation w[�ic�� is shea�� �tz�en � interparticle �t raction or coliesion � and resistance to pi� slip ca�[ed t��e � of internal f riction �. Yarti le Sic �ln 6 � �.STM � is �sed to tle ik�� the�i�tic tia�n of fie and eoa�' ag��s Ln the test i�t the sap [e is se�rated ttu�ough a secies Qf sieves of p�sive[y � gpen far d�tpxon of�a��ic[e �i distributio The btal prcentage �ssing �ach ai� is repoi�ted and aed to determ'tne the E�i�tion of fine and coarse aggregates in the��n GeoSolut�an�,c�uG. 17256 Densiiy of' Sil in Place by the D�•ive-Cylinder Method (ASTM D2937-04} and Laborato�y Determination of Water(Mois�ure) Con�en� of�oi1 anc� �Ic by Mass (ASTM 6]��} arc�ed ta oblaE�� values of in-place water contant andin-place density. Undisturbcd sarnples, E�Co�ig fromthc ficld to the laboratory, are weighed, thc i��e is calculated, and they are placed i�� tEle avc�� to d�y. Once tlle samples ha:ve been dried, tltey are�cigElcd aga to detcrmine tEle watein�cnt, and tlle in-place density is the�� caLcuEated. Tlte mo�sture density tests affow tlle water contcnf a��d in-place densities to bc obtained at requ€red deptEls. Dimensinnal Co�isolidation Properties of Soils Usi�ig Inc�•emental Loading (ASTM D2435-11} is d b t�ter � d�grti and rate 6 consolidatian 6 a do by� scries of Load increrncnts ta a �i �oE a�ple and recordiilg sarnpic d� arrnatian at sclected �e �e In tElis test �thod a �a spe�tnen s t�etl iatel,� and i�ed �l while �rctcd to i�me��tally �p !� �di ng. �'c stress incremcnt is pltaine until exccss porc �r psu�-es are �tial dis�ated. Q'ing � Ec�on p�sss, rneasu��ements a�-e �ad 6 flle �1 in tlte s�c a f�eigllt and �hi data is uscd fo et�ter ine � �i�t (a� ee� tlte �Etive st�-ess a�id �oid �a or st�'ain, and the t� at which ��lidation ca�i occur hy�vah�atin tlte � of�bns❑ f�`e alta fia the coilsolidation �e is used to E�ate tlle � aild fa o bot diff c�-cntial and btal L� ant ❑f ast�'ucture or eactli-f Il. GEeo5olutions, iN�. 17257 ` GeaSolutiaus,�nc. :. ���LSR.E]PORT (805)543T8539 Project: MadonnaFrooi�l Ranch DateTested: June3, 2016 3 ClienC PG�oject#: 5�,0973�#-1 f Samn le: A Deptkl: 1.D Foot La�i#: ]6SL6 Lacatian. B-1 Samole DaCe: May 18,Z016 � 5amp3edBy: GV/TG � � Soit Classificatio« I.,aboratory,MaximamBens�[y : A57�M D2�i87, I}Z�i8& ASTMI}I557 � Resu�[: Very Dai•Ic Grayish Brown 5andy Fat CLAY �.2,'. 5peciFication: CI� 5ie�re Analysis _ �.D: ' ` — A57�MI}�iZ2 . . � Sieve I'ercent Pro,ject ,� 4 g, � Si7� Passin 5�eci�tcaCians � � ; � , 3�� • ` ''^ 0.6'. 2" a6i . �] � z�z° ' � a.� — 1 � - - - � 314" . � No. 4 93 � 0.2.: - - - - No. 8 40 No. 16 89 O.D _ , 'D.4 ' 4.2 ' 0.4; 0:6 0.8 ' 1cD 1,.2 ' No. 3D 87 Na. 50 8� Water Cante��t,%. Na. 14D 82 No, ZDD 79.6 <Sand� uivalcnt Ca1217 i - � 3E 2 ' NIbld Iil > nla ' MbldDiairieter�.ns.;" ,'4;D0 3 Na:afL,avers ' ' S We's�htofItammei�;lbs. 10;00 4 . No:afBlaws.!: 25 .< I'I�sticity ii�dex ASTM�1431& _ Liauid Limit: 54 EstimatedS eciftcGravitvf'bi`ID4°/u 5aturat�orCu�ve .. % I'IasticLimit: Z3 T�•ial# 1 2 i 3: � I'lasticiCy[ndex, 3l Watei� Conte��; Expansian Ii�dex �s�vI3easxtv; ( A57�MD4829 M�iximum I�ry��i�si :�. �pans I�ldex: 107 �n 'a�er �ai�tent°/o ��on �'Icstent �► �llc1� �c1�.11fc1f1011 a�u: 5� . . . . . � � . �vloisti�re-Densit �$�I D39 � B�tI stur Gi�ten A57'NI P� bx ile �t (ft) �� �'mntent Div Densitv( c � ative Dens 6�m Descrit�tion B 2.5 38. � �} GravSandv� 8 2.5 27.�i Dark q�'e Grav9�e' �L,A �•t By: �•oi� Eichman B1 17258 € E � € € 'G�oSolution�tlnc. ': �OTLS R�PORT ($OS)543-�539 _ P�•ajeat: M�donna�'room Ranch Da[e Testeci: June&,2016 2 Client: P�oject#: SL04734-1 5�un Le: B De tl�: I.0 Poot Labt�: 16516 Locatiot�: S-3 5am le Date: M�v 18, 2016 3ampleciBy: GVIT'G ', � Soil C[assificaticr�� ': ; I;aboraEaryMa�irn�im DensiEy ASTNI D2487, D24&8 :AST�vI17I557 �� Result_ D�Ic C�ray Pat CLAY � I i 12. `� I ' � Speciticatian: Cl� j ; � � � . Sieve AnaEysis 1 _ �_:_ . � � � . I ASTMD422 � �a i ' � . �. �.:� i .'E :: � ` � Sieve Percenf Pa�oject �i "� 0 8 ' i I . I I f Size Passu�E 5 ecifcations � � � � ' I � ` � :;�' l � i I; a I ; �� 3� I in 0.6 �[ - ; _ i_� T! � -- —� c : 2" . a ' � � � j , i . � i � � I 1 I(2�, Q 6 4 ',� - , �:�. � -- ,. - , 1 ,. I '_..� ' 3(4" D.2 .j — � � � % ! ;— Na.4 100 � '� � i Na. � �aa I , . i x__. _�_�_ _ ��._ _�_,��:�_ __ , No, �6 too i a.a - - , - -1 Na. 3a �� a.a ': a.2 a.� ' a.� 'a s �.a �.2 , _ _ No.SD 98 � Water Content,%: No, 100 46 �10.200 94.7 � �n d r �� u.�v a ,�i;�n x : ,.�l._7__;_l,?�- � : --_� ,,. .. � t �-- —. __ ____ � .. � �, � .:� ... . _ _. . ... � — — — SE: _ ; 2 IvIo1dTB n/a.. .''. ' IVLaldDiaineter,i�is. 4,00 3. ` ' > ' I No.af�ave�.s ;, g ',; ' We' hkrf�ta�aarner;lbs. LO.DO 4 l�To.:ofBlaws , 25 Piasticity ���dex A5TMD43I& _ Lic�uidLimit: 84 Estitiiated�oecificGraVA ot`1��%'Saturatioi�u�•vc Ylas[icLiraait: 36 Trial#: 1 2 ; 3 � Pl�.sticityIndex: 48 V�at4�Coiitent: �x��ansia��Ync�ex DzV 17ens1 : S ' 1`NF D 48 2 A9 Ma3ci u�n DrJ'�ensity pcf. ,. , ` � Expansion�ndex: � r-----IBG dpkmum�ei .�on Eent;°/v: Expansiot�Yatet�tial: jo`er Higti �iI �Hit��,. %: 50 _ . _ '� ASTM1�2937,Moist e bhte �iS �221 � De fh(ftl '�Yer �fa►}tent D iD�ens (pcf} �at veiD�ns 8am 17escr'ntion B : �n �� an : _ � � v �2 17259 � � � a � �eo�olu�xons,Inc. ;: S��S R�POR� (805}543=8539 ! , �_<: __ Project Madonz�aFroomRaz�ch DaceTes[ed: Jt�ne9,2Q16 - Clienf: P�•oject#: SL09734-1 Sarrz�,le: C Denflt: 2.Q I'eet La6#: 16516 Location: T-2 5am le Date: Nlay 18, 20i6 5a�np1ed8y: GV1T'G � .� Soil Classification _ '.; ` Z;abo�•aEory;Nlasiniu�n Deitsity ASTNI D2�4&7,D2�#$8 ASTIVID1557 Resule: DarlcReddishBrown Sandy Fa�I A�Y 'i� � �2�.— � . --- -- -- I - _ - � . � S}aecification: CH .� , � �� � '� �� I I'_ ` SieveAnal sis �_. � , _..__ °�.._ -i Y � , .a -1_ ------�— _ _ . i ASTIvID422 _ I k ! � i i _Sieve Percent.: Pro ject .�. � €�. k �� _ ` -_ ' ; c� D.8 _ �---- ._._ _� i `Size Passin� 5aecifications I ¢- �_ __ ° , f E ��� � -� a.6 - � -3 -------;' z°� a � , i� � . ' I o � i l l(2' . j :� � I' i - _ 1 f}.4 � ----_ , _..-� �, _ � € � -- - -.E 3(4' i 0.2 .II . I � _.. - _ .. - - - i INo.� _ L €: � f� `No.B : . _ � � , � a.a -- - — ;�_..�.---�-_ �.� � _� �.�-��,. �. ` rro �6 ; �o a.z _ 0.4 a.6 a.s Z.a Z.z ` N�.sa , ' No.5U ' 4hlater:Content,% >No.T06 _ �V.��?i T�� a_n ri � raCTal� � &�l'�e n t� � � 1 SE.� ?, 2 Mo1�ID... 'n/a '.:IVIo1dI>iainefer,uts. `.' 4.60 3 Na.ofL;avers ` S We� hiafR.�xzaer,lbs. 10.00 � 4 ` No,o�Blows 25 Plastici[y�ndcx A5TMD431$ , I i t�id Limit: 65 �stimatedSi�ecificGravi �f'or104%�aturati��nCurve--- - Plastic I imit: 23 'I`rial#.:: I 2 .: 3``' 4: Plasticiryindex: �2 WatetCan[e€it::> �xpansion�ndcx ➢cvDensi : - A 5 T M D 4 8 29 Maximum�ry Dens�ty;pcf Fx}aansionLndex: �� T 79 Opt€mumWate-i�onten:t,o/v F xpansioa�I'otent€at: Mediu[�x IniYiaLSaturation,°/o: 50 , , _ MoisEure,DensitvA5T1VID2937,Moisfure�ontenk�' D2216 ��m De�th(ft Watei�ozatent(°/1 Drv]�e�zsitv( c� R.elative�7erisitv Sarzi le Description. Re�ortB : Aai•onF.icllman B� 17260 � E � �� � ��� � � �� �� �����. ., t ' GeoSaiutions, In� ; (�05) ��3 � , D2435-1:1 ; _ _ Project: Madonna�c�ooGn Ranch Date Tested: 617I2Q16 G(ient: Pra'ect#: SLD9734-1 SaEnv[e: B-1 5' Dentli: S.D �eet LaU#: 16516 LDC&t1D�i: B-� Samv[e Date: 5/18/2D16 MaCsc�ial: Very Da��kG�'ayisl3Brown Sandy CLAY Sampled By: GV/TG �.�� -�— _�;._._ _ _ ---�_ —� _ - F�. 2.0� � � �.. 4.�0 4� 5.�� ' •� 5.�� , � .. }. _ � - � 1�.�� - _ � - _ � 12.�� _ ` I�.QO � � � 16.�� 18.�� � ` 2�.�0 � __— � I l� I�� ���0 1�0�� Log of Pressuz'e App[ied P�•essure(psf} %Strain Compression Index,Cc 25D D.38 a.165 SDO 2.44 Recorn�ressionlndex,CE- 1Da0 6.55 D.D17 zoaa �o.�z �aoa �4.�� gaoa �s.3s zaoa ��.�z sao �s.s� Repai�t By: Aaron Eichman B4 17261 �r��c,. �'` Gco�ot►ans#` Inc. ' > ':(845� S�F3$539. ��VIA �B$' (ASTM D3aSa) Pro e[, h�edun &oin i��n h �c[ Nq., SL.(lHA3 E Clian4: �a[c�bk 61412�E6 ` .,...u� ... .�....._ .._ _... _. _ .,.� � Sainpfe No,: �Q @5` vuvth: �} Fee Lab No.: Cf5 _ iiaot B Checkd : � � , . _ .. ._ _ . � _ ;. .. MA1KFslL DESCf�iPTDN . 4L P4 ..�1 °/�passing Ge"` ...� �ampl �pe �.. � �Iv.2UU Ve DarkGraysh T3row�iSa�id�CLAX rrm izi�i nin pin �: ditu (rirgs} �t� ass�aned;nm=��ot aA5 ured ---�- u= 1 ksf — a=2�s ---• �=3 ksf — . . �= 4 ksf ---_� a= f ksf Q= 2 ksF � a= 3 ksf € — a= 4 C�s o �ak o Ulkimate �pp . � 2.5 ���. , . � . ��, € � �DD5 �'� Y 2.� _ .— .�.. � � � � � (n �' �,„__....-__ '�. _`_-- � ,,:� ; _.., �J .�.�J .� •.�•��.....,.. �„_� C,} �.QQ} - `: ..._..... ..,.� N � L7 \`r ���� ' �� � � �1 —� .r. . __� _ � 0 � _ �— _ - -�- t ' D.6 I �`��'=-- �� r� � „ �`� `~ �'``�-� .�- �2 ��� � �.•'` � . '•��. � � �� , � .. QD25 , , , .. . D.DO D.1D 0.2D DAD D.05 D.TD D.15 D 20 Hor�i R�e: ent(n} �ontaf �ner� (in) � � ' �� Initial ��._ ypecune[tNo. WW o Peak � i z 3 4 3.5 p �tlf� . Q.ry Density 92. 90. .._ 87.4 � ._W „= 3 Q �— �ea �_. W�f Ea� t(°/u) ZS.S ��.5 Z5.8 8.8 . _.. . �� � FJiameter� �l 2.4�. � 2 2.4 N 2.5 _...,�,,,,,,,,,,,,,,,--- 5ainple klei�hr(aJ ��� RO L00 1.OU m � u? '� -- .�_ .� SgeciEnen No. �.... . ` d'es�� .._ --�—� � �� t 2 3 ,� � �.5 � - ..... �._ ,�..._ � � -- I�ormatStress(kBj � ��}q �.� 4�� A " Peuk St1ea�63s �k) U."IZ [0 $ � 8 D.5 ___ bk �. � �e . �.. aG �9 � (�4 @4 . NvA Hea (in �'d m ll�im .0 SE1e�rS7ess(ks� (� $ 66 h.8 � Z8 0.0 �3. @ 3.0 9.4 �armal Stress(ksf} xoru �ipi. n Uk. �he � (En} ��€ � a ��+ A� S fnta al hp't (�n� � � S. R[C 6 �le Et U �c�h � � ry� (idin ) (MpD 2 B� _.._ � �}62 Remk s ....... ..µ._.. _. ....... �5 GvcreRD Satura[ed(�r 4 sh��-jn� .. _ ..� ._ � _ ,. ,.._ _ _.. 17262 APE'G,NDIXC USGS �es gn Map Summary Report USGS �s Map� Report C eo5o�utians, ��u�. 17263 6/21/2016 Design Maps 5ummary Reporl ��� Des�gn �s �rn Report Hser Specified Input E3.eport Title Froom Ranch - Upper Site �u � �1 �DL � 63 QT Building Code ReFerence Dacument ASCE 7-J D Standard (whi�h util,zes 9GS h�r_a �a availNl ��Z 5ite Coordinates 35.24SQ5°N, �8614°W �e Sail Classification �e �ss C— "Very Dense Soil and SoFt RocEc" �i Categary I/II/III 6_�_ , f) , . � Garsro . � i 1 J'�R `�.1�,.��x� �+� i ��i T� .. r o i f 1 I � � �' -� 3 � G ' � A �' � Y� f .' "gah Luis Obispo �} f ' . ,' ,;�I in . F::��,I�,l 1:. ; - ,r�r i>L�'. •f � I!: � ,� I j. I � f�� � q I . � :.�„L�ir. a T � .� �� C ` fl�n4!�I•u��rt t .�-■7 � ���j'�.';� � f' �, � {•iS !� . ' - � _ . . �. ��, �� -, i � , . . � � i. .. � . qh�� �.�Y s i, 4 . . . S �t I '��, Aq I � �. _ . USGS-Provided Output SS � 1.2$1 g SMS = 1.281 g Sps = 0.854 g Sl = 0.484 g 5�,� = 0.637 g 5R1= 0.425 g Far inFormation ar� how khe SS and Sl values abo�e have been calculated 6im �t�iabi (risk-targeted) and determi�istic graur�d mokEans in thedirection of maximum horizontal response, please retur� to the appl€cat€on and aet t€�e`�Z�a4 NEHRP" building code �fer�nce document. MCER Respanse SpeGtrum [7eslgn Respanse speGtrum LF3 6.93 130 0.94- 1.17 p•BL �4 0.72 D.�� 0.63 G� D.7B � Q.54 � O.GS m OA5 � Q.Sz 03G B9 P.27 - Eh.2G 0.1,8 P.13 D.DS• D.DO��--1--+—�—��—+—�—�� O.DO�—i—�—�—i--��--�--�--�-+� O.DD BP P.4p p.6D p.gQ 1.PP ]2Q iEh 16G 1,.80 2.pp DO p.2D D.AD 0.6Eh G.$G ]RG 1.2P 1.40 1.6G 1.Sp z.QQ Perfvd, T�ec� PeriQd, T[sec} For PGAF„ T�, C,�S and CRL values, �ase view � detailed reRDrt A€though 5h 6r nation 's a product�F� J.S. Geol�gical S.arvey, we�rov�d n air�y, Axpr Assed or imp�ied, as to the accuracy ofthe cEata contained Cherein. �ni �ooE�s nat aebstitut for Iseicaf abject-mattAr know�AdgA. 17264 �pr:C�i�aqake.cr usgsgovldesignm apsluslsurtmary.php?terrplate�ninim�l Satitude�5.2h&D5&Iongit�cle�120.686�t4&sitee�ss=��riskeatega �&ed .. d� 6I2V2016 �s �ps b�tai Reporl ��� I�es �lap �ta Report ASCE Y9 Standard (35.24805°N, �14°W) �e Class C - "Very Dense �a and SaFt Rock", Rlsk CaEegory I/II/III Section 11,4.1 — N�apped Acceleratian Parameters Nare; Ground Matian va ues provicEed be�Y are For the directian a�maxim�m horizonta spectral esponse ��fe �� ha�e been �onvert Fram carresPand�ng geometric mean graund a�ation computed by Bi�SU by app[ying 6�sst af il (ta obtai� 5S) and 1,3 (to obtain S,} �ap in the 2D7-0 ASCE-7 � ndard ar provtled for�e �ss B Adjustments for other � �sses er � as �feed in ��cti 81.4 From Figure 22-i GL� SS - �81 g From �gure Z2-Z �x� �S = 0.484 g Section 1i,4.Z— Sitie Class The authority h�r j�risdict[on (nat th� USGS), slte-speciFic geotechn�ca[ data, and/or the deFau It has classified the site as �e fass C, based on � �e soil � In accardance with Chap�er 20, �ab� Pa.3- Site �SaiE�c' Site Class y Nor N�,, � A. Hard R�Ck �5,000 Ft/5 N/A N/A B. RRck 2,500 to 5,000 f�/5 N/A P� C. Very dense soil and soFt rack 1,200 ta 2,500 ft/s �50 >2,aoa psF D. StiFF�0 600 to 1,200 Ft/s 15 to 5� 1,�0� to 2,0�0 psf �, Saf�by soil c600 Ft/s �5 c1,000 psF Any �roFil with eiar than 1� ft aF sai[ I�r rh� character€st€cs; . Plas�€c€ty €r�dex PI> 20, . �loiskur content w ? 4D9/a,and - Undrained shear strength su< 5DD psf F. 5oifs requiring �e response See Section P0.3 analys s in accordance with 5ection 21.1 Far S lft/s = 03048 m/s �ib/ft2 0� 9 �/ 17265 http:l�hp1-earthquakecr.�sgs.govlde�nmapsluslreport.php?terplate=minirrel&Iatitude=35.24505&lwE�'=- 120.68514&sitecHss=2&riskcategory�&edib. ., �6 G12 f12016 Desfgn Maps Detailed Report � E Sectian 11.4.3 -- Site Coef�icients and ��jeted Maximum Considered Earthc�uake (.MCER} : Spec�ral Response Acceleration Paramete�s Table 11.4--1: 5ite CaeFficient Fa Site Class Mapped NiC� R Spectral Response Aece{erat[on Parameter at 5hort Pe�-iod S� � O,ZS S; = 0.50 55 = 0.75 5S = I..66 55 ? 1.25 A 0.8 0.8 0.8 0.8 0.8 g �.o x.o �.a �.a �.a c �.2 iz �.� �.o �.a Q 1.6 �.4 �.2 i.� i.o ' E Z.5 I.7 1.2 0.9 0.9 � 5ee 5ection 11.47 oF ASCE 7 Note. Use stra[ght-iine interpalat�an Far interrnec�iate values oF � Fnr Sike Class= C and 5S � �..281 g. Fa = 1.DDD Tab{e 1.1.4-2: 5ite CaefFicient F� 5ite C{ass Mappec� MCE R Spectrai Response Acce�erat€on Parameter at I-s pe�-iod SL � 0.10 5� = O.ZO SL - 0.36 s1 = 0.4o S1 ? 0.50 A 0.8 6.8 0.8 0.8 0.8 a �.a �.o �.a �.a �.o C I..7 1.6 1S 1.4 I..3 p 2.4 2A 1.8 1.6 1.5 E 3.5 3.2 Z.8 2.4 Z.4 F See 5ection 11.4.7 0�ASCE 7 Nate; Use straight-iine knterpalatiar€ for intermecftate values of SL Far�ite G[ass�C and SL = 0.484 g� F„ = 1.316 17266 http:llehpi-earthquake,er.usgs.govldesignmapslus!report,php?template=min€maf&latitude=35.24845&lor�€tuHe=-12D.6861A&s€�eciass=2&riskcate�ory=4&e�'�io.._ �112p design Maps[�fa F2epor ��ua��a� ��1.�-1}: S�.,S = Fass = �.aaa �� _ �8i 9 �qu�tion �1 �-2 5,�, _ �S€ = 1.3].6 x �84 = a.637 g �sct 11.4.4 — Desigr� Spectral Acceleratian Parameters Equatian �1.4 Sos — 2/3 Sh�s = % x 1 ZB1 = 954 g �quatian (11.4 —4): Spl — Z/3 5�11 — z/3 x 637 — a.425 g Sectian ig.4 — qes Respanse Spectrum FrQrr� Fgure� «� T� — � ��Go �igur ��1: �sign Respanse 5pectrum T a�; � _�p I QI +Q.B T1To} � T p 5T5T a:S�=Sos =0.64 ���� � r �rs :r, s � rr � , B l a o! � � C�' i i T�T�:S`o'�' oET��T� � i N a � u � u � � d ' `� 5ot� 0.425 - ,-- -- ---,�---- -- ---- -- o � � ; � � : � � � � � a � '� � , , : ' a � � �n ' ' ' � � , � F � � � � , � a , Ta=6.1 60 TS!�.A9B DOp Perivd, T(sec� 17267 http:llehpl-earthquaker.usgslgovfdes�nmapslus�Feport.php?tempEate�nin ��litude= ��8D5&I h�= 4E�91.686t tecass=2&riskcategory�&edtia... 3!6 6/21/2016 Design hrfaps DelailedReport Section 11.�4.5 � F��i�e�ed Maxirr�um Consicfered Earthqualce (MCE,�) Response 5pectrum The MCE;� Respans� Spectrum is determined by multiplying Che design response spectrum above � by 1.5. � S,�s= 7..261 - ----� f � , � � � � � � � � � � �� � � o � � � � � � � � � � i � � � � � � u ' ' Q , i � i � '^ S�i=4.637 --�----- ----�- --- -- —- n = � ' a � E � � � � � � i i i � i i i L I � � � I I � a 1 I 1 Q � � � � 1 I I 1 � 1 1 i � � I � 1 I I I I T�= �.D99 Ta �1.497 L.00p Perind, T[sec} 17268 ht�p:llehpl-earthquake.cr.usgs.govf designmapsluslreport.php?templa[e=minimal&latitude=35.24865&langitude=-926.6B614&si teClass=2&r€skcategoFy=O&�f�... 6/21/2016 Qesgn Maps If�ta Report �iec 81. — �ia �ti �a I,�1��sti Report �r s fror � �s �Yego D through F From F��i ure 22-7 �4� PGA = 941 Equa�icsn �].]..8-]. PGAht = ���, = 1.DD0 x D.541 = D,541 g �"ab �i.E 5ite CaeFF cient FP�F, �e Mapped MCE �om Mean Peak Ground �t�a, PGA �ss ' PGR � m0 PGA = @0 PGA = Dd PGR = �0 PGR ? 60 A 6 6 O.S B 0.8 s i,o � i.o � �. C P P� i,l � m a i,6 � �.z i.i � E 2.5 17 � 0.9 0.9 F See �ec ].1.4.T oF ASCE T Note 5� �aight- �npol for interrnediate �a of PGq Far �e Class= C and PGA = R.541 c}r FP�a = L•000 Sectian �1t2 — Methad 1 (from Chapter 2� - Site-Specific Ground Motion Procedur�s for Seisrnic Design} From FJc�i ure 22-�.7_ �5� CR� = 9b2 From F�ci ure 22-].8 �6� CRL = b.939 17269 q�ti�ake .crgsg€desEgnm ��a"trem pla� minimaE&Iatitude�35.248D58�a�e= i�,86 2&ri�:categorY���tio.. . 5!6 6121l2016 Design Maps Detailed Repart Section 11.5— Seismic Design Category Table i1.6-1 5eismic DeSign Cakegory Basecl on 5hork Period Response Acceleratian Parameter 1 RISK CA�"EC`sORY VA�UE OF �pS ' I c�r II III LV �' �ps C [3.�67g A A A �� [3.�67g � �os C D.33g1 B B G U.339 � �os C D.!SOgI G C Q [3.5Og � �p� Q D D For Risk Category = i and 5ps = 0.85� �, Sei srr�ic Des€�n Cate�ory = R Taf�le J 1.6-2 5eismic Design Category Based on 1-S Period Response Acceleratior� Parameter RISK GATECORY V{���� �� �6L �i I c�r II I IV Spx C [3.067g A A A 0.[36'�g � ��� C [3.�33g B B C [3.�33g � SRi � [3.2Ug G C D [3.�,�g a Spx Q D D For Ftislc Category = � anc� SQ� = Q.�+zS g, Seismic Design Gategory = D Note: When Sl lSgreater than or equai to OJSg, the SeiSrr�ic Design Categary ks �For buildings !rt Rislc Gategorles I, II, artd III, and F for thase in RiSk Category IV, lrrespecti�e o� the abQve. �eism�c Des�gn Category = "the more severe deskgn category in accordance w�th Tabie 11.6-1 or 11.6-2" = D fVote: See Sectiort �.�..6 FQr alterrtative approaches ta caicuiating Seismic Desigrt Catego�'y. References l.. F�rgure22-.�: http;//earthquake.usgs.gQv/hazards/deslgnmaps/dawrtloads/pdFs/Z0�.0_ASC�-7 _Figu�'e_22-l..pdF 2. F�gure22-2: http://earthquafce.usgs.gov/hazards/designrr�aps/dawrtloads/�dfs/z01 D_ASC�-7_Figu reT22-z. pdF 3. Figure22-1Z: http://earthquake.usgs.go�/hazal"d5/deSlg�map5/dowrti0ads/pdFs/20�. D_ASGE-7_Figu re_22-].z .pdF 4. F�rgur.22-7: http://earthqualce.usgs.gov/hazards/designrr�aps/dawrtloads/pdFs/ZO�. D_ASC�-7_Figu re_22-7. pdF 5. F�rgure22-17: http://earthqualce.usgs.gov/hazards/designmaps/dowrtioads/�dfs/20].0_ASC�-7 _Figul"e_2z-].7 .pdF 6. Frgure22-18: http;//earthquake.usgs.gQv/hazards/designmaps/dQwrtiaads/pdFs/2�1. a_ASG�-7_Figu re_22-1.8 .pdF 17270 http,7�ehp1-earthquake.cr.usgs.govldesignmapsluslreport.php?ternplate=minimal&Iak�kude=35.24805&longitude=-12D.6B614&s€teclass=2&riskcategary=Q&ec�,{�... 612t12016 Design Maps Summary Repart � Des ign �Ip Bjmm p�# �� Input Repoi�t Title Froom Ranch - L.awer 5ite �u �n Zi 20i6 23:4581 UTC Building Cade Reference Ilocument ASCE 7-1Q 5ta�dard (which atili es �SGS �a rd �ta �� In �DDB �e Caardinates 35,248�5°N, 120.68614°W 5ite 5oil ClassiFicakian f�e �ss E – "SaFt by Soil" Risk Category I/II/III 1ARtJ� .'I � �� f �n1S.^n � i � . — — � � . ,. 1'.�X,f-1' i � Iaa�T'T Ff� I�',�— � -. . `r � � o e [ '�� � � r O, 3 � D i .f .o i• . /` � • w� r � ` ��'111�UIS Q}Ji5�74 � � • �137 �a p•1��1�TNR ' r- C3E Rr� '� y � � .k '�� y- i � ':.�.L iii�.�a 7 ��� ' n:�u ai•���{, � � r..l rn ( t S ��� • ! �G` ' .' . , ���� A,�, I �ti - _ rl ��� 'C'o � . ' � � .�ryg���.¢ ^ L4 4 . 1� ' . . �� f ,���i ;�: 1 s -s ,ys' � � '�� ,. USGS-Provided Output 5S = 1,281 g S,�S = 1.I53 g Sos = �.769 g SL = �84 9 S�nl = 1,162 g 5p� _ �,774 g 6 inPormation on how the 55 and Si values above ha�e been calculatec� From �robabilisti (risk-targeted) and deterministic ground motions in thedirection oF r-rsax€mum horizonta{ response, please return to the application and �t the"20D9 NEHRP" builciing �ocie reFerence dacu€nant MCER Response Spectrum Design Response Spectrum �B �Q 0.80 1.68 Q��� 0.96 D.GS O.S4 O.SG T 4.7� Q� 0.45 � V � P.GP � 0.40 N � O.dB 432 0.36 4.24 0.24- � pQ 0.48 o.00�—i—�—+--r—i—�—+--�—�—� o.00 a---i—�—+--�—i—�—+—+---r� O.EfU U.20 0Ei 4.64 D.$D 1.00 320 1.44 1.6p L.gp 2.00 0.44 4.20 4fl 4.64 4.80 1.44 L�4 �A 1_6p 1.80 2.00 Perivd, T[sec� Periad, T(se�) For PGA�.t, T�, CRs, and CR� values, p{ease view rhe ai repart Atthough t� irtFormation is a product oF L�e U,S, Geo€ogEcal ��a-v we provide no warranty, expresseff or mpl�ed, as ko khe accuracy aP tl�edata co-rttalned therefn• �hl toof�no[a dDaCe forkechnical subject-rnatterlqowledge. 17271 ����a��ry,i�j@y�{��j��� 'y����614&siteclass=4&riskcategory=0&ed.. q 6/21/2016 DesignMaps�t�i�port ��� Design Maps Detailec� Report ASC� Y9 5tandard (35.24805°N, 120.68614°W} Site Class E - "Soft Cfay Soil", Rislc Category I/II/III Section 11.4.1 — Mapped Acceleratian Parameters Note, Cround motion �alues provided below are For the direction of maximum horizontal spectral response �'taa They have been converted From corresponding geometric mean graund motians computed by the �G5 by �pp ying �actor oF 1.1 (to obtain S�) and 1.3 (ta abtakn �x Maps in the ZD�a A75CE �andard ar� provided For�e � B. �¢ijents For other �e �sses are made, as needed, in 6�cti 81-•4 From Fiyure 22-1 �l� 55 = i.28i g Fronn F�gure 22-2 �Zl Sl = D.484 g 5ection i1.4.2— Site Class The authority ha�ing jurisdiction (not the U5G5}, site-specific krai��c data, and/or the defaufk has d�s ph site as 5ite C�ss E, based on the �e soi properties in accardance w�th Chapter 2a. f�ab ZD.3—�- �e ClassiFication Sit� Class vs Nor N�h s�, A, Hard Rock �5,400 fl�Js N/A N/A B Rock Z,500 to 6(�7 f/s p�W P�WW C. Very dense soil and soFt rock �Z00 to 2,500 ft/s �5 �9.D �is p � �oiE � 90 to �Oa �/ 5 to 56 u100 to�60 pf E, SoFt�la b �6 �t/ <15 <l,DO pF �. proFile ikr rsre �� 1-D Ft of 6 ge the �gract + �sticl �de PI> @ . Moisture cantent w ? 40°ro,and . Undrafned �he atr gh su � 54a psF F �o�l t�i n g site respons� 6e Sectio� 0. 1 �sis in accordance i�h �t P 6 5I: lFt/s = 0.3�8 m/5 � _ �TH �Irt2 17272 http:l�hp�-earthquakecr.usgs.go�lde�gnmpp�l�G�t�eport plate=inin al&I amude=35.248a5&bngitude=-126.686148�sitec�ss=48�riskcateg�rY�&aditio. _ . 116 6I21I2016 Design Maps Detailed Report Section 11.4.3 - Sit� Caefficients and Risk-Targeted Maximurn CansEdered Earthquake (.MCER) ;. 5pec�raf Response Acceieration Parame�ers Table 11.4-1. Site CoeFFicient Fa � s 3 Site Class Mapped MCE R 5pectral f�esporsse Acceieration Parameker at 5hort Period 5S <_ �.25 5� = 0.50 S5 = �J5 SS = ]..�� SS ? 1.�5 A 0.8 0.� 0.8 0.8 0.8 � B ]..D 1.0 l.� 1..� l.� C l.� l.Z 1.1. 1.0 1.0 D 1.6 1.4 1.2 l.l 1,0 � �.5 I.7 l.Z 0.9 0.9 � 5ee Section 11.4.7 c�f ASCE 7 Note: Use straight-lir�e interpolation For intermediate values oF SS Far�ite Cla&s- E and SS = 1.251 g, Fa= 0.30a Table 71--�+-2: S€�e CoefFicient F„ Site Class Mapped MCE R Spectral f�esponse Acceleration Parameter at 1--s Period ' Sx 5 0.10 51 = a.Z� S, = 0.3� 5� � �.4� S� ? 0.50 A 0.8 0.8 �.8 0.8 �.8 B 1.0 ]..D 1.0 1.� 1.0 C 1.7 ]..6 1.5 1.4 1.3 [3 �.4 �.0 1.8 1.6 1.5 E 3.5 3.2 �.B 2.4 �.4 F 5ee Section 11.4J oF ASC� 7 Note: Use straight-lir�e inkerpolatior� Fc�r intermediake values o�51 Fcrr Site Class� E artcE Sx = D.484 g, F„ � 2.466 17273 http:7lehp1-earthquake.cr.�sgs.govl�esignmapsf uslreport.php?template=minima68�fatitude=35.248058�1angitude--'E20.6B614&sitaclass=4&riskcategory=a�e�t�... 6(21l2a16 Desgn Maps Detailed Report Equation (1i.4-1}: Sr�s = ��Ss = 900 x �B1 = 1.153 g ftquat �:�..4�-2, SML = E5� _ �}QQ x �84 = 1162 g Sect�Qn 11.4.4 — Design Spectrai Accei eration �arame Equation (iL.4-3): 5os = 2/z Sr,s = z/a x 1153 = �69 g EquaYian �]..4 4}: Sn� = z/3 Srt� = Z�3 x 1.152 = �7 g Section 11.4.S — �j�s &�spon Spectrum Fram F�c�i ure 22-12 C3� T4 = 8 seconds �ure 11,4-i; Design Respanse Spectrum #T a_ S�»3�(Q.�4+U.6 Tf To) Spi=D.7G9 --_ �o S 7 5�s � �63 y s�=a.�6� ; � � � �TS �So Sa�il' � � � � � n i � T> S o8 o�T��T2 � � � � , y � , � , � � � � � i � i + a i � � � { ' � � a � a { � � � { + � , � , i � � � a + + a � � � � � + � � a @DD Ta�9Q1 �L.D03 Periad,T(sec} 17274 �{�h earth�uake.cn�sgs.gavfdes�nm��lrreport p[ate�ninim�l&afitude=35.2�4566&ongitude�12p.6861�4&s tecass=a&rfskcategory�l&edite�. _ 316 6121I2Q16 Des'tgn Maps Deta€led Reparl 5ectian 1.J�.4.6 — ��eted Maximurn Considered Ear�hquake (MCER} Respo�se Spectru� The MCE� Respanse 5pectrurr3 is determined by muEtipiying t€ie desi9n respo�se spect�-um above � E�y 1.5. ��;s= 1.I53 -� t rn �!�s=1.�.50 �i i � � � � � � � , � c � ' � � � � � � � � � � a , � V � � � � i i f N � 3 � I j o I 1 a � � � � � � � � 3 + '� k � i � � i � y � � a � � � � � , � � � � � i ; 1.OpD T„=�.2€31 TS=1.DE73 Periot�, T(sec) 17275 h�tp:l�l ahpl-earthq�aKe.cr.usgs.govldesignrnapsluslrepart.php?ternp{ate=rninima[&Ialilude=35.24805&Pongitude=-12R.68614&sitec�ass=4&riskcal�orY=O&edi(�.-, 6/21/2016 Design Maps Detailed Repart Sectian �1..8. — Acicfitianal Geot�chnical ��sti Report Rec{uirem�nts for �ic �s Cak�gories D through F From F � re 22-7 �41 PGA = 0.541 Euatian �.�.5-1): PGA�� = FP�nPGA = D.900 x a.541 = 0,4�7 9 Table � Site CoeFFic€ent FF�a �e Mappec� MCE �eametr �lea Peak Ground �r�n, PGq C�ss — � PCA� 0.10 PGA = D,20 P�A = DO PGA = D,40 PCA >_0.50 A B 8, 6 B, B, g 1,D 1.0 1.0 L.0 1.0 C 1.2 1.2 1.1 0 1.0 D 1.6 1,4 1.2 1.1 1,0 E Z.5 1J �. D.4 0.4 F 5ee 5ecrian �17 aF ASCE 7 Note; Use �[�ight- interpolatian far inrermec�iate values oF PGA Fpr 51te C6d38- E and PGA = 0.541 g, FP�A = 0,900 Sect�on 21.2.1.1 — Method 1 (from Chapter 21 -- Site-Specific Ground Motion Procedures for Seismic Design} From �ure 22-�7 �5� CRS - D.902 From Fgure �S �6� CRl - a,939 17276 http:llehp1-earthquake.cr.�sgs.govldesigr�p�sluslreporq�hp?ierrplate=minimal&Iatitude�5.248058�ID�= .68614&siteckass=4&rlskcat�o-rY�1&ed�io-.. 5f6 3 6121�2p16 Design Maps Detail�Repn�t ; ; 3 Section 1]..6— 5eismic Design Ca�egory � Table 11.6-1. Seismic Design Cakegory Based on Short Period Response Accelerat€an Parameter � �LSK CAT�C`a4� � VALU� �� 5as I or LI I Ia! � C D.167g A A A D.167� � � C ES3g B B C �� � �os � �. C C Q �9 � �os Q Q Q Far ftisl< GaYegory = I and �ps = �.769 g� �aisrr�ic �esign Category= p Table 11.6-2 Seismic design Cakegary Baseci on L-S Period Response Acceleration Para�neter �I�K ��E GOI�Y VR.LEI� �� � LorL I T/ �ol C D.�16Tc,,� A A A (?.(?67g c Spi C D.133� B B C D�l��g C �pf C �1.2�1g C C D � D.2D9 � �oi Q D Q Far Ftisk Categary = I and 5p1 = �.774 g� SeismPc �esign CaCegory= a NQte: WhenS1 Es greater rhan or ec}ual ro �JSg, the Seismic pesign Caregory is Efar buildings in Risk Caregories I, II, and III, and F For those [n R€sk Caregory N, irrespecrive oF the above. Seismic Resign Category = "the more severe des[gn ca�egory kn accordance with Tabfe 11.6-1 ar 11.6-2" = D Nate: 5ee SeckiQn L1.6 for a[kernat�ve appraaches to calcu�ating Seismic pes�gn CategarY• ReFerenees �.. F�gur e22-Z: http://earthqua�e.usgs.gov/hazards/designrrsaps/down�oads/pdfs/201p ASCE-7 _Flgure_22-1.pdf 2. F�gure22-2: http://earChquake.usgs.gov�hazards/des€gn rnaps/down laads/pd�s/2D lOTASCE-7_Figu re_22-2.pdf 3. F�gure22-Z2, hkkp://earthquake.usgs.gov/hazards/design maps/dawn laads/pdfs/zD10�,qSCE Jgu a� �Sd 4. F�gure�71 .�sgs,gav/hazards/des �SCE �u �2 7.�d 5 F�gure�; ������v/hazards/designrr� O1D_�,SCE � .pdf 5, Figure�2-18: �ake.usgs.gov�hazards/des ��own /2p1�SCE 7�� .pdf 17277 htfp:llehpl-earthquake.cr.usgs.gavldes€gnmapsluslreport,php?ternpfate=rninima�&latitucfe=35.24&Q5&f ongitude--12D.6861A&siteclass=4&riskcatego�y=08�e�... APP�NDIXD Preli�ninary Grading Specificatians Key aE1d Bench with Bacicdrain GeaSolut�nns,i�u�. 17278 NR�LIMINARY G1iAD11�IG SP�CIE'ICATIONS A CTener�l I Tliese preliminary specifications have been prepared forthe subject site; GeoSolutions, Inc. s�ould be cansulted prior to ti�e commencement of sfte worlc a55ociated wlth 5ite deveLopment to ensut'e comptiance wfth these speciftcations. 2. CieoSolutEoizs, Inc. sl�ould be notifted at $ea 72 hoUrs prior to site �aring or grading operations on the property in order to �x�ve the sh'ipping of arface n�aterfals and to coordinate the work with tlle grading contractor En the fiekd. 3 1'hes� gradiizg specifications may be ii�odified �d sUperseded by �k�t� contained in the text of this reporl andlor�k�ue reports. 4, if�iite ae ti � tihe a��on of�i�e �din �ecificatioIl � the �i �eer �11 p�l�v the � fnterpreta{fon. B Obl'r�atian of Parties l The f6� Engineer should �i�a observatfon and �stin services �d �ho� ��� � �� tions to a�6e � client an ��hnfcal ��. �'e Sof�s �n ineer should cepa� � findings and r�cothine E[s to the �nt or he �dthori repre5entat�, 2. The � �ho be �1}ie rbs�b for� aspects of the p��. �'e client or �ri E-epresative has � �i�� of i�ie the �din and pa���ons of the 6ils �ng � �ing the fent o the �ori �'epresentative should �n �i�e o sh�u reinain �a �essible to all concerned �ies in order to a1�e CIeGfSE0I15 �ecessac b � fn the�w of the��o j 3 �'h a�a�a: is�aib e forthe g3f of tile gect aln �atisfactor �ralia of aLl �in dr► �# �� on constructl� ��s �tin but not Il�d �o eac�thwaek in e�cc t�i paj � pla� � �cifications and �ht ag�mc �ts C, SIrC �I'Q[)�lI':l�l I The �e pior to �rn �k � or �in shoukd arra� and €��id a �tin which Lndes he � �� the�as� 5trk�c� �eer the SoE�s �r , pesentatives 6 he bca b�$ depaL�en as �el as �rn other rxnnce ed p��. All �ties should be yen at�t 72 ilours notice. 2 1� 6'sr eln sub surf��.ce d lateri us �t� sho�ld be �n�o �uui� the psa{� building ad pavei�en a�as d i�posed � s�- or as�p{� � the Soils �ee This � h 's e�ti �d1 b, t�y �bris organfc �ateria c�in�t �poils b ried l�jtili kine, septic �sl� bgitdin �h� and �rn other �ce �des 6'�ic i�ith � Q��d bLdEng areas. 1Tees �a for I� on the ced�iat� �lls shou�d be �1 and thei �ri rool �y�t � under he �r �ations of a �esentatEve � �'pSDLi.l�ED175 �ra b�ds � fn' ait �- g► shoukd be ckeaned and bdckfil as recommended �r a��tt•al �jl G�ao5olutions, in[�. 17279 3 Once tlie Site has been cleared, thc cxposed ground s«rface�ould be slripped to remove aI�face vegetation and organic soiL. A re�rescr�tative of GeoSolutions, inc. shou[d deter�n��ie the rec�«i:l�ed depth of stripping at the time of worlc beiiig completed. Strippi�1gs may eitkter be disposed of off- site or stocicpiLed forfut��re �ise in�a�ldscape a�'eas, if approved by thelandscape arehitect. ll Sitc �eti L Pratection of the Site dtiri�lg the perioci oF grading a�1d ca�1struct�o�1 shou[d � the respons�bi[�ty of tlle contractor. Z. The canh�actor should be res�o�1sible f or� stabi[[t y of a[1 temporary excavat�o�1s. 3 During pei�iads of rainfall, p�astic slleeting shou[d be ke�t easonab[y �f�€.ess to �t ��cted slopes fiB �g �� (d�re �ecess d��ring periads of ���yittfa the c�tt �ai� �tal � �iag ��s sar�d �gs, o other de��ces or �ds e� �r to o�1tco1 ecosio�1 a�1d �covid safeconditions. E G�,cavat i� I �aa tL1at are �hsti sllould be �avated unde�- tlle t�bservatio �n �� of the � Eag�n e. �tls mate�'ials �ilude b�at�►a not be �mi to 1} �[iy �ose �, � prganic or I�b �tu ral �oi[s 2) �d ��he � � �d 3) � g�ered filL; 4} otller� �teria�s a�1d 5) m�rials �nti by the �i �� or� ���ri �ist 2. �l �i e�m ded by ti�e Soils Ell��' and �� by the bcal ��i �fa[ �ame t at � �lloti ut b steepe�' than 2: 1 ���a[ to vec�ical). �a �pe �s �l1 umnfor b section 1804 of t[�e 2013 � Bui�[g Gk[e �as �� rn odifieci � tlle�o � ��o[o 3 g'e Bo Ea�r /Eng►eer �r �ogist sho��ld n��ie cut�opes �u e�avat[ons g'e �ctor s� ld fipti tlle�s � g�i�e�' � prior ta�innin slope �avatio�ls. [' hltuctu �l l Strl�clura fill shou�i �o �i41 t�s Larger�fla 3 inches in geatest �s�o�1 and d� �i �e no t�ae tI1an 15 �t i �n $ i�1c��es in g�'eakes� �sion. 2. �t� fill �h uld b Ee of organic a�1d r�the de[ete�'iou materia[ � shou[d �ave ver 6e� �a �� �h a �la �e of 12 or �s Before deliveRy to the $e a �m of the �s �p t� kiou be �s ed in ou�' �aborator to �ine its �t for use � s� ctui�al�i G. Corr����ctc�l Ifi I St«►ct ra[ filf gi � �nI' or llati�e should be �ced 11 ��t�l [ayel�s each �rox 8 �he n �ss bef ore com�ctio �te �I'�3I1�C soi 1 or � impoi-ted I� shou ld � onditio11ed a�i1 �er to �ce a �oi ��' �3onte �iear p�mu � d �pd b a��1i�limu re�t ve i��lsi �f pe�'cent based on �iVI Dl S�7 Geo5o�utions, itie. 17280 2 I^i1L slopes should not be QQtructed at geadients �tee than 2-[0-1 ��Ual tio vei�tical). �'h contractor �ould notify the Soils Engineer�ngi�1eer �#eologi [�rior tio bgin�li�1g slape �cavati 3. If�l[ areas ace son �•�2ct oii s�p geeatee lhaEi 10-10-1 �J�t�L �o vertical}, we reco�►►►nei1d that benches b c�t eyva4 feet as fill 's placed. Each �eh sha« be a minimum of 10 feet wide witit aminimu� of 2 peecent gradie�1t into tlie�pe. 4, If fll areas are�ahstru ❑ �apes �te�' than 5-to-I, we e&�b�nm �at th toe of all ai�eas �o �cei fi[L be Iceyed aminimum of 24 �h Ento �i�uie�'I dense ma�ei�ial, Key �epth are to be abserved and �pav by a epeesentative of��ls �. �i�tt s �all be �r�ed in �h �way a�1d bnches � 't�td. H. Dr�in�ge I �ue ng gradir�g, a e ��ati � �ion hc shou�d evaLuate the dee �r a �Eain or � §tke �r of observed � 6��i be i�eo �ii �s �ce � to e[ease �h �.'t�s� p�i�'es. Sub�ace dra age f acilities may �hc g� � �o � tre�ishe ar C�ii g� oc q Lla�. �'e t� st�;� shoLl ld disghac e a a�-e ma�1�►er �1to a�1 �p¢lo t�ige area 2, �� �ea �uld be �� �h a�sve e�age �t�td ayr �xm founelt t�s, �►al � sho�kl �I'4V Fo pad re�oval � �ce �a CU� . �ildill of�ra shoul�{ not be �r on b�i � pads u � cent� �dati �ial �t�a dhouL be rhe �y of � p�t ge�}era� �l �rg or �dt 3. � tra�e � �,te ffina wlhin or i�tel ��ent to tlze �e a1-ro l�{ � g�ollve e� in pipes or in liiied �ue to rl�ge eas that e ��ative �ve� or that aee � ��;ted against e�n. 4. �r Fom 60 �o � b �n �d in solid }�es that �' in ��11 draniag �c . S�e it�lage �e�1ts slzoLild b �nned b �vent �on eln pramote 't� ge � �� �te �ay �im �ati �ndations edges ��s a�ld i� �i� koi �re w�tsco mend � a� of2 �}nt g be ina ntained, 5 �tttt �h be �id by the �r to g�n �p on of s� arfaces �d ace�1t p the ea�g 6 sba �s and �a and in other aeeas�ee ha�'d edges � p�s ay aa coua� � �w 6 �uce �,te�� txz �if E� resistant � �h as ��ram or othei� �n �t� � b [�e �r �ni�1 e�tge channels ( �ih- s shbu d b placed in efiaab�i hed �ia�e courses a�1d �orentia �e�a areas, fi'e lo�i n � �eti.il �[t be detiermined � a e� of rhe �ding �la � �d ��tlet sltolzi � end i�►to suitab�e �ti oe connecti to the � �orm t$ �tn p �i ting �a ��i faciities �'he oL�tlet pipe �11ou Gon of a� pe �he �a�n dia�etee as t'�d peef o �. C eoSolutions,�N�. 17281 I, iMaiaEice l. Maintenance af slopes is important to their bng-term pej�fori�ance.�recaution tha� cai1 be ta[cen include �lautin with appeapriate draught-resistant vegeCaCion as cecominended by a landscape architect, and not o�eE�i��gati a pcima�y so�uce [�f�ciaL failures. 2. Property owners should be inade �war lhal over-wate��ing of h�pes s ��t��j2 �a long tei��n fiability of�p J. Un[lerg�•ound �`�cilities f'eistruc � 1 The attentio�� af contractors, paE'ticularly the underground �oi�tracta�� , �oulci be ciraw� ta t�ze 6tat of Ca�iFonl�a �an teucton � Orders for ��tions �'�c Eat�tl�waek." �nches oc �t���s geat�r than 5 �e i1 � � ulc� be �laec� or �t� �ac En acca��dance � �A R�ions prior to entI.y 2. �1 's � »ed as �teria pldcsl a trench� to 1 faot�ve a i.tt{[ pi and �ack is a« material �i in h t��t � � bedding �Je ss concrete bed�ii�g is �reci e�d �tilit p,e fre�i� sa»d hl b eed � �e ding. �a1 ta b �c� as �cldEn �ou be �e teci in n [abarato�y to £� �s �hy and to ineasuj�e its �Ciun �ha��acte��i �ic . �nd �ding sftould � (x� ed � �c �ns � �.ve al �east 90 ���cent �ive �si based a�l ASTM ffiIi.557 3 (t��-s �nic slo s, or apqvved impai�t, �a � used as il� trench �ack �o �c 6 � �kfi i�k � n�:cessa under and �den ta � �il bufciing �mdat ��;e $�b aild vehicle pave�►�ents �i these areas, �� shauld be dondi�iane dai w �r � ta �ijy to �oduee a sail wale�� contentia�about 2 ta 3 Qrcent above�h �ti �an �d{ n �ta� �' each i�ot �e�in inches in l��i�s be�a rnp �ac ou. �h �i' �l OLlICl � �►� to atteas 90 �cce re�atEve i�nsi based on ASTM�557 �'h �a lift� �enc �� under ��h pavei�neuts sholi d b �ecf b � �ire �t �n n t'�po � �ia of�ved �as fQ�� vehicle pave�nent sub � des. � kv �t be �pr �sr �or b and durEng ��c �ceir�ent. lf �pl af� l �' �k� �ion � �rk a repar� b�ould � p�eed � the 6ai � ��� retained to pro�id �c e�.es �' �pt shauld ii�gu locatios� and �I�al a��id I�nsi � �nt� 6 �d d�1 �'y �a, ather ��'t�l �a and � �ent ❑ ai�y �han d� i�r ng �'a and �ir E�t on rhe oe mmendations �j2ade in the p�ved Soi�s �gineer �rt. 2 �i � ��ers �ha �n a��e �hat ta tihe be of their �ge the�or i+t�tzi�► dlei � of�s s in �da�ce �h tae �� sai�s �ngineeri�► repo��t�d �able �i��s i�hi I�apler $ af the � �BC GeoSolutinns, in�c. 17282 i € 1 TI�,i, �V��T �;� J�� r lu'4UN1�D4JAly4`LDFLi�7VHAfN y�,�'pe� l r r r� ❑TlYTl'JVlV.�Fi4'IiCP�{4d,E,�G¢ R CS 55YALF:91T7i7SJOl5'NF1RAQt5 �y s'` ✓ � _ �z� � � ��` .�1$7.�'�-r r U'�u �.� r^ '� V�,Li�F9�, � � f � Itk:i���� RGhtC[�:VLR'f7CAf:=ll�f'.M11�![M1tliNf . 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I-UAI:KUIthfN�SIhNS:VMI.tP�RF31�Q6�H Hi`F&`� C11N64�43'Ar1'Pftitkj�"TilE58A(:KDFL.1]DUfi'f AIL .^.[.SIA4J, VPLN OFLYD]S : ,�U�k:����,,�F� ��� 1 ar�,!n�ar4 on�-�nrc�r: \�;:�:.,�i . �_ aiT.mr.}m�acH-u�ta ,rs';.v;��';7 zresr �;:tf;�;r. � a�rw.nt:,t Z,�„ i�j��,���_� �r�ar.n�— -- r;[:Y 4 R{C1tL5 oli7Th � I'� G4[duvSllM —— -H— 3I�fIP.'PNflh�IIMR7. 6D BRIC: N�I..' I LS`/DIsN AR�AFOS=§D-7p, 1FI:�.kEINIMV�9N9IlE.�IE• �`s��D�d��l��]lQDi1S?�Yl�: zz� z�z����eez l — ���t�I� �]�I�I���Tl[".�'IE��.P�.���li�� ��T� Sau LuisC)bsspu,�A9S401 tt (&65j 543-&539 I�ax�(�i65)543-2171 17283