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Item 5e. Authorization to advertise Mill Street Sewer Replacement Project (Spec. 2000561)
Item 5e Department: Public Works Cost Center: 6102 For Agenda of: 10/15/2024 Placement: Consent Estimated Time: N/A FROM: Matt Horn, Public Works Director Prepared By: Hai Nguyen Senior Civil Engineer SUBJECT: AUTHORIZATION TO ADVERTISE MILL STREET SEWER REPLACEMENT PROJECT, SPECIFICATION NO. 2000561 RECOMMENDATION 1. Approve the project plans and specifications for Mill Street Sewer Replacement, Specification Number 2000561; and 2. Authorize staff to advertise for bids; and 3. Authorize the City Manager to award the Construction Contract pursuant to Section 3.24.190 of the Municipal Code if the lowest responsible bid is within the Engineer’s Estimate of $2,400,000; and 4. Authorize the City Engineer to approve Contract Change Order s up to the available project budget and any amended budget subsequently approved by the City Manager up to $200,000. POLICY CONTEXT The City Council approved the Wastewater Collection System Infrastructure Renewal Strategy in January 2016. The plan identified a strategy for prioritizing pipeline replacement in the wastewater collection system to serve existing customers and future development in the City. On May 17, 2022, Council approved a Purchasing Policy Update to the Financial Management Manual that requires Council approval for Public Projects that cost over $200,000. DISCUSSION Background Replacement and rehabilitation of wastewater collection (sewer) pipes is part of an ongoing program to maintain aging and deteriorating infrastructure. This program has several objectives: 1) ensure reliable removal of wastewater; 2) reduce the need for emergency repairs; 3) reduce the need for preventative maintenance; and 4) ensure uninterrupted wastewater flow without health or environmental hazard s from wastewater leakage. This project will accomplish these objectives for a portion of the City’s wastewater collection system. Page 119 of 560 Item 5e The Project The project plans (Attachment A) and specifications (Attachment B) propose to replace 3,595 linear feet of sewer mains on Morro Street, Mill Street, Toro Street and Santa Rosa Street. The existing sewer pipes planned for replacement work have been video inspected and confirmed to have reached the end of their useful life. Previous Council or Advisory Body Action This Project was identified in the 2021-23 Financial Plan that was approved by Council with a budget of $1,620,000. Council approved an additional $253,000 in the 2023-25 Financial Plan. Council also adopted the FY 2024-25 Supplement Budget and approved an additional $1,100,000 for the project on June 4, 2024. Public Engagement Public engagement was conducted during the initial identification of this project to be included in the 2021-23 and 2023-25 Financial Plans. In addition, public comment was open at the Council Meeting when the 2024-25 Supplemental Budget was approved. CONCURRENCE This project has the concurrence of the Utilities Department. ENVIRONMENTAL REVIEW The project consists of replacement of existing sewer mains within existing streets, and a portion of the project site is located within a potentially archaeologically sensitive zone. Based on the scope and location of the project, it is consistent with previously adopted Initial Study/Mitigated Negative Declaration (IS/MND) ER10 -07 and no subsequent or supplemental environmental review is warranted. Mitigation measures approved through IS/MND ER10-07 are included in the project’s specifications and will be followed by the City’s contractor, consistent with the requirements of the California Environmental Quality Act (CEQA). FISCAL IMPACT Budgeted: Yes Budget Year: 2021-23 Funding Identified: Yes Fiscal Analysis: Funding Sources Total Budget Available Current Funding Request Remaining Balance Annual Ongoing Cost General Fund State Federal Fees Sewer Fund: $2,769,714 $2,769,714 $0 N/A Total $2,769,714 $2,769,714 $0 N/A Page 120 of 560 Item 5e Mill Street Sewer Replacement (2000561) Construction Estimate $2,400,000 Contingencies $350,000 Material Testing $10,000 Archaeological Monitoring $9,214 Printing $500 Total Cost of Project $2,769,714 Total Available Funding $2,769,714 Remaining Balance $0 Sewerline improvements identified in this project are desc ribed in the 2021-23 Financial Plan. Funding for this project is available in the Project Account (2000561) which has a current balance $2,769,714 and will provide sufficient funding to support the project costs. ALTERNATIVES Deny or defer approval to advertise. The City Council may choose to deny or defer the approval to advertise this project. Staff does not recommend this option, as the sewer mains included in this project has reached the end of useful life and pose a high risk of catastrophic failure, requiring expensive repairs. ATTACHMENTS A - Project Plans (Spec. 2000561) B - Project Specifications (Spec. 2000561) Page 121 of 560 Page 122 of 560 index to plans sheet no. description san luis obispo county, california SPECIFICATION NO.DATE SHEET 2000561 FILE NO./LOCATION 9of1 MILL STREET SEWER REPLACEMENT SEPTEMBER 2024 DEAD OR UNUSED SEWER LATERAL, VERIFY CONDITION. ABANDON IN PLACE IF DEAD, UNUSED, OR CAPPED. CONNECT SEWER LATERALS AND MARK TOP OF CURB WITH THE LETTER "S" PER ENG. STD. 6810. DSDS SS SS 1. IT SHALL BE THE RESPONSIBILITY OF THE CONTRACTOR OR PERMITTEE TO CONTACT "UNDERGROUND SERVICE ALERT U.S.A." TOLL FREE AT 1-800-227-2600 FORTY-EIGHT (48) HOURS PRIOR TO START OF CONSTRUCTION, FOR LOCATION OF POWER, TELEPHONE, OIL AND NATURAL GAS UNDERGROUND FACILITIES. CONTRACTOR OR PERMITEE SHALL ALSO CONTACT THE APPROPRIATE AGENCY FOR THE LOCATION OF CABLE T.V., WATER, SEWER, DRAINAGE OR UNDERGROUND FACILITIES. 2. THE CONTRACTOR SHALL POSSESS A CLASS "A" OR "C-34" LICENSE AT THE TIME OF BID OPENING. 3. TIE OUT CENTERLINE MONUMENTS BEFORE WORK AND REPLACE IF DISTURBED IN ACCORDANCE WITH THE LAND SURVEYORS ACT, AND SECTION 5-1.36E, REPLACE MONUMENT AND WELL PER ENG. STD. 9020. 4. THE CONTRACTOR MUST REPLACE ALL PAVEMENT STRIPES, MARKINGS, AND MARKERS DISTURBED DURING CONSTRUCTION. ALL PAVEMENT STRIPES AND MARKINGS WITHIN 5 FEET OF THE DISTURBED AREA MUST BE REPLACED. ALL STRIPING IS PER STATE STANDARD PLANS AND PER PER ENGINEERING STANDARD SPECIFICATION 84-1.01A. 5. SEWER MAIN WITH LESS THAN 1% SLOPE MUST BE INSTALLED WITH FLOAT ROCK AS BEDDING AND INITIAL BACKFILL. SEE ENG. STD. 6020, NOTE 10 FOR ADDITIONAL REQUIREMENTS. 6. CONNECT EXISTING VCP SEWER MAIN TO NEW MANHOLE WITH 3 FOOT PVC STUB AND STRONG BACK RC COUPLINGS. 7. CONNECT EXISTING HDPE SEWER MAIN TO NEW MANHOLE WITH 3 FOOT HDPE STUB AND FUSED COUPLINGS OR BUTT FUSION. 8. CONNECT EXISTING PVC SEWER MAIN TO NEW MANHOLE WITH 3 FOOT PVC STUB AND PVC COUPLINGS. 9. ALL PVC AND HDPE PIPE CONNECTIONS MUST BE MADE WITH POLY-CAM SERIES 731 COUPLINGS OR APPROVED EQUAL. 10. ALL PIPE LENGTHS ARE APPROXIMATE. THE CONTRACTOR IS RESPONSIBLE FOR VERIFYING ALL PIPE LENGTHS. 11. APPROXIMATE LOCATION OF LATERALS ARE SHOWN ON PLANS. LOCATING LATERALS IS THE RESPONSIBILITY OF THE CONTRACTOR AND ANY DAMAGE TO A LATERAL MUST BE REPAIRED IMMEDIATELY AND AT NO COST TO THE CITY. 12. ALL NEW MANHOLE MUST BE COATED PER SECTION 77-3.03D OF THE PROJECT SPECIAL PROVISIONS. Reference Documents: City Standard Specifications - 2020 Edition City Engineering Standards - 2020 Edition 1 2 3 4 5 6 7 8 9 COVER SHEET MORRO STREET MILL STREET MILL STREET MILL STREET MILL STREET TORO STREET SANTA ROSA STREET SANTA ROSA STREET SEWER MANHOLE FLOW DIAGRAM SCHEMATIC. TROUGH VARIES WITH PIPE LAYOUT. ARROWS INDICATE FLOW DIRECTION. (E) STORM DRAIN (E) SEWER (E) WATER (E) GAS (E) OIL SDSD SSSS WW GG OO (E) TELEPHONE (E) FIBER OPTIC ABANDONED SEWER ABANDONED WATER TT FOFO ASAS AWAW Project Locations APPROVED BY No. C 79870 BRI A N A . NELS O N CIV I L Brian A. Nelson, City Engineer R.C.E. C79870 Approved Date SIZE & INV SIZE & INV Page 123 of 560 230 235 240 245 250 255 230 235 240 245 250 255 9+75 10+00 10+25 10+50 10+75 11+00 11+25 11+50 11+75 12+00 12+25 12+50 12+75 13+00 13+25 13+50 13+75 (N) 360' - 8" HD P E S E W E R , S = 3 . 4 2 % BY OPEN TREN C H I N G & R E M O V E ( E ) 6 " V C P S E W E R STA. 9+89.20 (E) SSMH K09-11 RIM = 235.94' 8" IN 229.50' (NW) 8" OUT 229.40' (SW) STA. 13+48.88 (N) SSMH K09-1 RIM = 249.42' 8" IN 241.90' (NE) 8" OUT 241.80' (SE) CONNECT TO (E) SEWER MANHOLE PER ENG. STD. 6610 (E) TELE (E) TELE (E) TELE (E) 10" PVC WATER (E) TELE (E) FIRE SERVICE (E) ELECTRIC (E) TELE (E) ELECTRIC (E) ELECTRIC (E) TELE (E) TELE T T T T T T T T T T T T T T T T G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS S SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS S SS SS SS SD SD SD SD SD SD SD SD W W W W W T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T TT T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW W W W W W W W W W AW AW AW AW AW AW AW W W W W W W W W W W WW W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W T T T T T T T E E E E E E E E E E E E E E E E E E E DU SS SS SS DU DU SS SS SS SS DU DU DU DU DU SS SS SS SS SS SS DUDUDU G G G G T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T E E EEEEEEEEEEEE E E E E E E E E E E E E E E E E E T T T T T T E E E T T T T T T EE E C C E E E E C E C E T TTE T E E E E E E E E E E E E T E E T WW +10 00 +11 00 +12 00 +13 00 +14 00 (N) 360' - 8" HDPE SEWER STA 9+89.20 (E) SSMH K09-11 RIM = 235.94' STA 13+48.88 (N) SSMH K09-1 RIM = 249.42' 34 ' 7' 4' 7' MORRO ST PA L M S T (E) 8" PVC WATER (2006) ABANDONED (E) 8" CI WATER (E) 2" GAS (E) TELEPHONE (E) TELEPHONE MI L L S T 00 + 20 00 (N ) 3 4 1 ' - 8 " H D P E S E W E R (E ) 8 " P V C S E W E R (E ) 8 " P V C S E W E R (E) 8" PVC SEWER (N) 360' - 8" HDPE SEWER (E) 8" PVC WATER (2006) ABANDONED (E) 8" CI WATER (E) TELEPHONE (E ) 8 " P V C W A T E R ( 1 9 8 2 ) AB N D ( E ) 6 " C I W A T E R (E ) 2 " G A S (E ) T E L E P H O N E (E ) 2 " G A S (E ) 2 " G A S (E ) 1 0 " P V C W A T E R (E ) 1 0 " T E L E P O N E 4' 12 ' (E) TELEPHONE (E) TELEPHONE (E) 2" GAS ABANDONED (E) 8" CI WATER (E) 8" PVC WATER (E) 8" TELEPHONE (E ) 1 0 " D I P W A T E R AB A N D O N E D ( E ) 6 " C I W A T E R (E ) 2 " G A S (E) SSMH K09-11 8" IN 229.50 8" OUT 229.40 REMOVE AND REPLACE SSMH K09-1 PER ENG. STD. 6610 8" IN 241.90 8" IN 229.80 (E ) T E L E P H O N E (E ) 1 0 " P V C W A T E R 0 SCALE IN FEET 20 40 MO R R O S T R E E T 2 HORIZ1" = 20' VERT 1" = 4' SEE SHEET 3 CITY SPECIFICATION NO. DATE: PR O J E C T T I T L E : SH E E T T I T L E : of SHEET NO. DESIGNED BY: DRAWN BY: CHECKED BY: APPROVED BY: SCALE: PLAN FILE NO. / LOCATION HN MI L L S T R E E T S E W E R R E P L A C E M E N T HN MB BN SEPTEMBER 2024 2000561 9 APPROVED: XXXX Page 124 of 560 STA. 19+94.01 (N) SSMH K09-1 RIM = 249.42' 8" IN 241.90' (NE) 8" OUT 241.80' (SE) STA. 23+35.22 (N) SSMH K08-42 RIM = 253.78' 8" IN 247.10' (NE) 8" OUT 247.00' (SW) (N) 341' - 8" HDPE SEWER, S = 1 . 4 9 % BY OPEN TRENCHING & REMO V E ( E ) 6 " V C P S E W E R (N) 498' - 8" HDPE SEWER, S = 1.3 6 % BY OPEN TRENCHING & REMOVE ( E ) 6 " V C P S E W E R (E) TELE (E) 8" WATER (E) TELE (E) FIRE SERVICE (E) TELE (E) TELE (E) FIRE SERVICE (E) TELE (E) TELE (E) GAS (E) TELE (E) 10" DIP WATER (E) TELE G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS S SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS W T T T T T TT T T T T T T T T T T T T T T T T T T TTT T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T W W W W W W W W W W W W AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW W W W W W W W W W W W W W W W W AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AWW W W W W W W W W W AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W T T T T T T T E E E W W W W DUDU DU DU DU SS SS DU SS SS SS SS SS SS DU DU DU SS SS SS SS SS SS DU DU DU SS SS SS SS SS DU DU DU W DUDU DU DU DU SS SS SS DU DU DU SS SS SS T T T T T T T T T T T T T T T T T T T T T T T T T G G G G G G G T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T E E E E E E E E E E E E E E E E E T T T T T T T T T T T T T T T T T T T T E C T T TS T T T T T T T STA 23+35.22 (N) SSMH K08-42 RIM = 253.78' (N) 341' - 8" HDPE SEWER STA 19+94.01 (N) SSMH K09-1 RIM = 249.42' +20 00 +21 00 +22 00 +23 00 +24 00 +25 00 MILL ST MO R R O S T OS S O S T (E) 8" PVC WATER (1982) ABANDONED (E) 6" CI WATER (E) 2" GAS (E) TELEPHONE 40 ' 18 ' 13 ' 40 ' 17 ' 13 ' (N) 341' - 8" HDPE SEWER MILL ST (N ) 3 6 0 ' - 8 " H D P E S E W E R (E ) 8 " P V C W A T E R ( 2 0 0 6 ) AB A N D O N E D ( E ) 8 " C I W A T E R (E ) T E L E P H O N E (E) 8" PVC WATER (1982) ABND (E) 6" CI WATER (E) 2" GAS (E) TELEPHONE (N) 498' - 8" HDPE SEWER (E) 8" PVC WATER (1982) (E) TELEPHONE (E) 2" GAS (E) TELEPHONE (E ) T E L E P H O N E (E ) 2 " G A S AB A N D O N E D ( E ) 8 " C I W A T E R (E ) 8 " P V C W A T E R (E ) 8 " T E L E P H O N E 5' 4' (E ) 2 " G A S (E ) 1 0 " D I P W A T E R ( 1 9 8 2 ) (E ) 2 " G A S (E ) 1 0 " D I P W A T E R ( 1 9 8 2 ) 7' AB A N D O N E D ( E ) 4 " W A T E R AB A N D O N E D ( E ) 4 " W A T E R 3' REMOVE AND REPLACE SSMH K08-42 PER ENG. STD. 6610 8" IN 247.108" OUT 247.00 REMOVE AND REPLACE SSMH K09-1 PER ENG. STD. 6610 8" IN 241.90 8" OUT 229.80 TAKE PRECAUTION PROTECT (E) CONDUITS PROTECT (E) TELE MH REPLACE WATER WELL AND COVER PER ENG. STD. 6340 19+75 20+00 20+25 20+50 20+75 21+00 21+25 21+50 21+75 22+00 22+25 22+50 22+75 23+00 23+25 23+50 23+75 24+00 24+25 24+50 24+75 25+00 25+25 240 245 250 255 260 265 270 CITY SPECIFICATION NO. DATE: PR O J E C T T I T L E : SH E E T T I T L E : of SHEET NO. DESIGNED BY: DRAWN BY: CHECKED BY: APPROVED BY: SCALE: PLAN FILE NO. / LOCATION HN MI L L S T R E E T S E W E R R E P L A C E M E N T HN MB BN SEPTEMBER 2024 2000561 9 APPROVED: XXXX 0 SCALE IN FEET 20 40 3 HORIZ1" = 20' VERT 1" = 4' MA T C H L I N E - S T A . 2 5 + 2 5 . 0 0 : S E E S H E E T 4 SEE SHEET 2 MA T C H L I N E - S T A . 2 5 + 2 5 . 0 0 : S E E S H E E T 4 MI L L S T R E E T Page 125 of 560 STA. 28+33.49 (N) SSMH K08-34 RIM = 262.92' 8" IN 254.00' (NE) 8" IN 254.00' (NW) 8" OUT 253.90' (SW) (N) 498' - 8" HDPE SEWER, S = 1.3 6 % BY OPEN TRENCHING & REMOVE ( E ) 6 " V C P S E W E R (N) 511' - 8" HDPE SEWER, S = 1 . 4 9 % BY OPEN TRENCHING & REMOV E ( E ) 6 " V C P S E W E R (E) FIRE SERVICE (E) TELE (E) TS (E) ELECTRIC (E) 8" DIP WATER (E) 10" GAS (E) TS (E) FIRE SERVICE G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G W W W W W W W W W SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SSSSSSSS WW W T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T W W W W W W W W W W W W W W W W W W W W W W W W W W WWWWWWWWWWWWWWWWWWWWWWWWWW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW W W W W W W W W W AW AW AW AW AW AW AW AW W W W W W W W W W W W W W W W W W W W W W W SS DU DU DU SS DU SS SS DU SS SS SS SS SS SS DU DU DU SS SS SS DU DU DU DU DU DU SS SS SS DU DU DU DU DU DU DU DU DU DU SS DU SS SS SS DU DU DU SS SS SS SS SS SS DU DU DU DU DU DU SS SS SS DU DU DU DU DU DU SS SS SS G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T TS TS TS TS TS TS TS TS TS TS TS TS TS TS TS TS TS TS TS TS TS TS TS TS TS TS TS TS TS TS TS TS TS TS TS TS TS TS WWWWW SSSS T T T T T T T T T T E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E G G G G G G G G G G G G G G G G G T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T E T W W W T T T T T T T T T T T T T T T T T T T T T T T T T T T (N) 498' - 8" HDPE SEWER STA 28+33.49 (N) SSMH K08-34 RIM = 262.92' +26 00 +27 00 +28 00 +29 00 +30 00 +31 MILL ST SA N T A R O S A (E) 8" PVC WATER (1982) ABANDONED (E) 6" CI WATER (E) 2" GAS (E) TELEPHONE 40 ' 10 ' 20 ' 3' 7' 40 ' 15 . 7 ' 14 . 7 ' 9. 6 ' MILL ST (N) 511' - 8" HDPE SEWER (E) 6" CI WATER (1943) (E) 2" GAS (E) TELEPHONE (E ) 8 " D I P W A T E R ( 1 9 7 8 ) (E ) 1 0 " G A S (E ) 8 " H D P E S E W E R (E ) 8 " D I P W A T E R ( 1 9 7 8 ) (E ) 8 " G A S AB A N D O N E D ( E ) 4 " W A T E R A B A N D O N E D ( E ) 4 " W A T E R ABANDONED (E) TS LOOPS (E ) T S C O N D U I T REMOVE AND REPLACE SSMH K08-34 PER ENG. STD. 6610 8" IN 254.00 8" IN 254.00 8" OUT 253.90 TAKE PRECAUTION PROTECT (E) CITY CONDUITS REPLACE CITY COMM MH PER ENG. STD. 9030 25+25 25+50 25+75 26+00 26+25 26+50 26+75 27+00 27+25 27+50 27+75 28+00 28+25 28+50 28+75 29+00 29+25 29+50 29+75 30+00 30+25 30+50 30+75 31+00 240 245 250 255 260 265 270 275 CITY SPECIFICATION NO. DATE: PR O J E C T T I T L E : SH E E T T I T L E : of SHEET NO. DESIGNED BY: DRAWN BY: CHECKED BY: APPROVED BY: SCALE: PLAN FILE NO. / LOCATION HN MI L L S T R E E T S E W E R R E P L A C E M E N T HN MB BN SEPTEMBER 2024 2000561 9 APPROVED: XXXX 0 SCALE IN FEET 20 40 4 HORIZ1" = 20' VERT 1" = 4' MA T C H L I N E - S T A . 3 1 + 0 0 . 0 0 : S E E S H E E T 5 MA T C H L I N E - S T A . 2 5 + 2 5 . 0 0 : S E E S H E E T 3 MA T C H L I N E - S T A . 3 1 + 0 0 . 0 0 : S E E S H E E T 5 MA T C H L I N E - S T A . 2 5 + 2 5 . 0 0 : S E E S H E E T 3 MI L L S T R E E T SEE SHEET 8 Page 126 of 560 STA. 33+44.60 (N) SSMH K08-27 RIM = 268.66' 8" IN 261.70' (NE) 8" IN 261.70' (NW) 8" OUT 261.60' (SW) STA. 36+35.76 (N) SSMH K08-23 RIM = 275.13' 8" IN 267.80' (NE) 8" OUT 267.70' (SW) (N) 291' - 8" HDPE SEW E R , S = 2 . 0 6 % BY OPEN TRENCHING & R E M O V E ( E ) 6 " V C P S E W E R (N) 511' - 8" HDPE SEWER, S = 1 . 4 9 % BY OPEN TRENCHING & REMOV E ( E ) 6 " V C P S E W E R (N) 195' - 8 " H D P E S E W E R S = 4.73%, B Y O P E N T R E N C H I N G & REMOVE ( E ) 6 " V C P S E W E R (E) TELE (E) TELE (E) 8" PVC WATER(E) 2" GAS G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS W W W W T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W AW AW AW AW AW AW AW AW W W W W W W W W W AW AW AW AW AW AW AW W W W W W W W W W W W W W W W W W W W W W W W W SS SS SS SS SS SS SS SS SS SS W W W W W W W W W W W W W W W W W W W W W W W T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T DU SS SS DU SS DU DU DU DU SS SS SS DU DU DU SS SS SS SS SS SS DU DU DU SS SS SS DU DU DU SS SS SS SS SS SS DU DU DU SS SS SS DU DU DU DU DU DU SS SS SS SS SS SS DU SS SS DU SS SS SS DU DUDUDU DU DUDUDU G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T (N) 511' - 8" HDPE SEWER STA 33+44.60 (N) SSMH K08-27 RIM = 268.66' STA 36+35.76 (N) SSMH K08-23 RIM = 275.13' (N) 291' - 8" HDPE SEWER +00 +32 00 +33 00 +34 00 +35 00 +36 00 (E) 6" CI WATER (1943) (E) 2" GAS (E) TELEPHONE MILL ST TO R O S T (E) 6" CI WATER (1943) (E) 2" GAS (E) TELEPHONE 40 ' 10 ' 19 ' 7' 4' 40 ' 10 ' 19 ' 7' 4' MILL ST (N ) 2 8 8 ' - 8 " H D P E S E W E R (E ) T E L E P H O N E (E ) T E L E P H O N E (E ) 8 " P V C W A T E R ( 2 0 0 9 ) AB A N D O N E D ( E ) 1 0 " C I W A T E R (E ) 2 " G A S (E ) T E L E P H O N E (E ) 8 " P V C W A T E R ( 2 0 0 9 ) AB A N D O N E D ( E ) 1 0 " C I W A T E R (E ) 2 " G A S REMOVE AND REPLACE SSMH K08-27 PER ENG. STD. 6610 8" IN 261.70 8" IN 261.70 8" OUT 261.60 (N) SSMH K08-23 PER ENG. STD. 6610 8" IN 267.808" OUT 267.70 TAKE PRECAUTION PROTECT (E) CITY CONDUITS TAKE PRECAUTION PROTECT (E) CITY CONDUITS 31+00 31+25 31+50 31+75 32+00 32+25 32+50 32+75 33+00 33+25 33+50 33+75 34+00 34+25 34+50 34+75 35+00 35+25 35+50 35+75 36+00 36+25 36+50 36+75 250 255 260 265 270 275 280 285 CITY SPECIFICATION NO. DATE: PR O J E C T T I T L E : SH E E T T I T L E : of SHEET NO. DESIGNED BY: DRAWN BY: CHECKED BY: APPROVED BY: SCALE: PLAN FILE NO. / LOCATION HN MI L L S T R E E T S E W E R R E P L A C E M E N T HN MB BN SEPTEMBER 2024 2000561 9 APPROVED: XXXX 0 SCALE IN FEET 20 40 5 HORIZ1" = 20' VERT 1" = 4' MA T C H L I N E - S T A . 3 6 + 7 5 . 0 0 : S E E S H E E T 6 MA T C H L I N E - S T A . 3 1 + 0 0 . 0 0 : S E E S H E E T 4 MA T C H L I N E - S T A . 3 6 + 7 5 . 0 0 : S E E S H E E T 6 MA T C H L I N E - S T A . 3 1 + 0 0 . 0 0 : S E E S H E E T 4 SEE SHEET 7 MI L L S T R E E T Page 127 of 560 STA. 38+30.31 (N) SSMH K08-18 RIM = 285.05' 8" IN 277.10' (NE) 8" OUT 277.00' (SW) (N) 195' - 8 " H D P E S E W E R , S = 4 . 7 3 % BY OPEN T R E N C H I N G & R E M O V E ( E ) 6 " V C P S E W E R (N) 492' - 8" HDPE SEW E R , S = 2 . 0 1 % BY OPEN TRENCHING & R E M O V E ( E ) 6 " V C P S E W E R (E) TELE (E) TELE (E) 2" GAS (E) 6" CI WATER G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W DUSSDUSSSSDU DU DU DU DU DU DU SS SS SS DU DU DU DU DU DU SS SS SS SS SS SS DU DU DU SS SS SS SS SS SS SS SS SS DU DU DU DU DU DU DU DU DU SSSSSSSSSSSSSSSSSSDUDU G G G G G GG G G G G G G G G G G G G G G G G G G G G G T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T (N) 195' - 8" HDPE SEWER STA 38+30.31 (N) SSMH K08-18 RIM = 285.05' (N) 492' - 8" HDPE SEWER +37 00 +38 00 +39 00 +40 00 +41 00 +42 00 JO H N S O N A V E (E) 4" CI WATER (1941) (E) 2" GAS 40 ' 10 ' 19 ' 6' 5' (E) 6" CI WATER (1943) (E) 2" GAS (E) TELEPHONE 40 ' 10 ' 20 ' MILL ST 10 ' (E ) 4 " C I W A T E R ( 1 9 4 1 ) (E ) T E L E P H O N E (E ) 2 " G A S (E ) 6 " C I W A T E R ( 1 9 4 3 ) (E ) T E L E P H O N E REMOVE AND REPLACE SSMH K08-18 PER ENG. STD. 6610 8" IN 277.108" OUT 277.00 TAKE PRECAUTION PROTECT (E) CITY CONDUITS 265 270 275 280 285 290 295 300 36+75 37+00 37+25 37+50 37+75 38+00 38+25 38+50 38+75 39+00 39+25 39+50 39+75 40+00 40+25 40+50 40+75 41+00 41+25 41+50 41+75 42+00 42+25 42+50 CITY SPECIFICATION NO. DATE: PR O J E C T T I T L E : SH E E T T I T L E : of SHEET NO. DESIGNED BY: DRAWN BY: CHECKED BY: APPROVED BY: SCALE: PLAN FILE NO. / LOCATION HN MI L L S T R E E T S E W E R R E P L A C E M E N T HN MB BN SEPTEMBER 2024 2000561 9 APPROVED: XXXX 0 SCALE IN FEET 20 40 MI L L S T R E E T 6 HORIZ1" = 20' VERT 1" = 4' MA T C H L I N E - S T A . 4 2 + 5 0 . 0 0 : S E E S H E E T 7 MA T C H L I N E - S T A . 3 6 + 7 5 . 0 0 : S E E S H E E T 5 MA T C H L I N E - S T A . 4 2 + 5 0 . 0 0 : S E E S H E E T 7 MA T C H L I N E - S T A . 3 6 + 7 5 . 0 0 : S E E S H E E T 5 Page 128 of 560 STA. 43+21.83 (N) SSCO K08-12 RIM = 292.98' 8" OUT 287.00' (SW) (N) 492' - 8" HDPE SEWE R , S = 2 . 0 1 % BY OPEN TRENCHING & R E M O V E ( E ) 6 " V C P S E W E R G G G G G G G G G G G G G G G G G G G G G G G G G G SS SS SS SS SS SS WW W W W W W W W W W W W W W W W W W W W W W W W W W W SS SS SS SSSS STA 43+21.83 (N) SSCO K08-12 RIM = 292.98' +43 00 PE P P E R S T 40 ' 10 . 2 ' 20 . 5 ' 9. 3 ' MILL ST (N) 492' - 8" HDPE SEWER (E) 4" CI WATER (1941) (E) 2" GAS REMOVE AND REPLACE SSCO K08-12 PER ENG. STD. 6710 8" OUT 287.00 260 265 270 275 280 260 265 270 275 280 49+75 50+00 50+25 50+50 50+75 51+00 51+25 51+50 51+75 52+00 52+25 52+50 52+75 53+00 STA. 49+91.01 (N) SSMH K08-27 RIM = 268.66' 8" IN 261.70' (NE) 8" IN 261.70' (NW) 8" OUT 261.60' (SW) (N) 288' - 8" HDPE SEWER, S = 1 . 6 6 % BY OPEN TRENCHING & REM O V E ( E ) 6 " V C P S E W E R STA. 52+79.40 (N) SSCO K08-21 RIM = 272.45' 8" OUT 266.50' (SE) (E) 6" CI WATER (E) 2" GAS (E) TELEPHONE 42+50 42+75 43+00 43+25 43+50 280 285 290 295 300 305 G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS T T T T T T T T T T T T T T T T T W W W W W W W W W W W W AW AW AW W W W W W W W W W W W W W W W W W W W W W W W W W W W W W AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW W W W W W W W W W SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS WW W WW T T T T T T T T T T T T TTTTTTTTTTTTTTTTTTTT T TTT T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T W W W W W T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T DU SSSSSS DUDUDU SS SS SS DU DUSSSSDU SS SS SS DU DU DU SS SS SS SS SS SS DU DU DU SS SS SS DU DU DU DU DU DU DU DU DU DU G G G G G G G G GGGG G G G G G G G G G G G G G GGGG T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T W W T T T T T T T T T T T T T T T T T T + 33 00 + 34 00 (N) 288' - 8" HDPE SEWER (E) 8" PVC WATER (2009) ABANDONED (E) 10" CI WATER (E) 2" GAS (E) TELEPHONE 40 ' 15 . 8 ' 13 . 8 ' 3. 4 ' 7. 0 ' TORO ST +50 00 +51 00 +52 00 +53 00 (N) 288' - 8" HDPE SEWERSTA 49+91.01 (N) SSMH K08-27 RIM = 268.66' STA 52+79.40 (N) SSCO K08-21 RIM = 272.45' MI L L S T (E) TELEPHONE (E) TELEPHONE (E) 8" PVC WATER (2009) ABANDONED (E) 10" CI WATER (E) 2" GAS REMOVE AND REPLACE SSMH K08-27 PER ENG. STD. 6610 8" IN 261.70 8" OUT 261.60 8" IN 261.70 REMOVE AND REPLACE SSCO K08-21 PER ENG. STD. 6710 8" OUT 266.50 (N ) 5 1 1 ' - 8 " H D P E S E W E R (N ) 2 9 1 ' - 8 " H D P E S E W E R REPLACE (E) CROSS GUTTER PER ENG. STD. 4310 CITY SPECIFICATION NO. DATE: PR O J E C T T I T L E : SH E E T T I T L E : of SHEET NO. DESIGNED BY: DRAWN BY: CHECKED BY: APPROVED BY: SCALE: PLAN FILE NO. / LOCATION HN MI L L S T R E E T S E W E R R E P L A C E M E N T HN MB BN SEPTEMBER 2024 2000561 9 APPROVED: XXXX 0 SCALE IN FEET 20 40 TO R O S T R E E T 7 HORIZ1" = 20' VERT 1" = 4' MA T C H L I N E - S T A . 4 2 + 5 0 . 0 0 : S E E S H E E T 6 MA T C H L I N E - S T A . 4 2 + 5 0 . 0 0 : S E E S H E E T 6 SEE SHEET 5 SEE SHEET 5 0 SCALE IN FEET 20 40 Page 129 of 560 240 245 250 255 260 265 270 240 245 250 255 260 265 270 57+00 57+25 57+50 57+75 58+00 58+25 58+50 58+75 59+00 59+25 59+50 59+75 60+00 60+25 60+50 (N) 289' - 6" H D P E S E W E R , S = 3 . 2 9 % BY OPEN TR E N C H I N G & R E M O V E ( E ) 6 " V C P S E W E R STA. 9+90.53 (E) SSMH K08-43 RIM = 252.07' 6" IN 243.50' (NW) 6" OUT 243.40' (SW) STA. 12+78.66 (N) SSCO K08-38 RIM = 261.12' 6" OUT 253.00' (SE) CONNECT TO (E) SEWER MANHOLE PER ENG. STD. 6610 (E) TS (E) TELE (E) 10" PVC WATER W W W W W W W W W W W W W W W W W W W W W W W W W W W W W G G G G G G G G G G G G G SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS W W W W W W W W W AW AW AW AW AW AW AW AW W W W W W W W AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW GGGGGGGGGGGGGGGGGGGGGGGGGGG W W W AW AW AW AW AW T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T TS TS TS TS TS WW W W W W W W W W W W W W W W W SS SS SS SS SS SS DU DU SS SS DU DU DU DU DU DU DU DU DU DU SS SS SS SS DU DU DU DU SS SS SS SS DU DU DU DU W TS TS TS TS TS TS E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E G T T T T T T T T T T T T T T T T T T T T T T T TS E CATV TEL E TEL CATV E E CATV TE E T T TSTS E E E E E E E E E TS T E T T T T T T T TS TS TS TS TS TS TS TS TS TS TS TS +00 +58 00 +59 00 +60 00 (E) 8" DIP WATER (1978) (E) 10" GAS ABANDONED (E) 4" WATER (E) 8" DIP WATER (1978) (E) 10" GAS ABANDONED (E) 4" WATER 64 ' 24 ' (E) 10" PVC WATER (1993) ABANDONED (E) 8" CI WATER 16 ' 12 ' 12 ' (E ) 6 " V C P S E W E R (E ) 8 " C I W A T E R (E ) 1 0 " P V C W A T E R ( 1 9 9 3 ) (E ) 6 " P V C S E W E R (N) 289' - 6" HDPE SEWER (N) 289' - 6" HDPE SEWER STA 12+78.66 (N) SSCO K08-38 RIM = 261.12' STA 9+90.53 (E) SSMH K08-43 RIM = 252.07' SANTA ROSA ST PA L M S T (E ) A B A N D O N E D 8 " C I W A T E R REMOVE AND REPLACE SSCO K08-38 PER ENG. STD. 6710 6" OUT 253.00 (E) SSMH K08-43 6" OUT 244.90 6" OUT 245.00 CITY SPECIFICATION NO. DATE: PR O J E C T T I T L E : SH E E T T I T L E : of SHEET NO. DESIGNED BY: DRAWN BY: CHECKED BY: APPROVED BY: SCALE: PLAN FILE NO. / LOCATION HN MI L L S T R E E T S E W E R R E P L A C E M E N T HN MB BN SEPTEMBER 2024 2000561 9 APPROVED: XXXX SA N T A R O S A S T R E E T 8 HORIZ1" = 20' VERT 1" = 4' 0 SCALE IN FEET 20 40 MA T C H L I N E - S T A . 6 0 + 5 0 . 0 0 : S E E S H E E T 9 SE E S H E E T 4 Page 130 of 560 220 225 230 235 240 245 250 220 225 230 235 240 245 250 60+50 60+75 61+00 61+25 61+50 61+75 62+00 62+25 62+50 62+75 63+00 63+25 63+50 63+75 64+00 64+25 64+50 STA. 60+85.57 (N) SSCO K08-48 RIM = 247.89' 8" OUT 240.00' (SE) (N) 12" DIP STORM (N) 33 4 ' - 8 " H D P E S E W E R , S = 6 . 9 2 % BY O P E N T R E N C H I N G CONNECT TO (E) SEWER MANHOLE PER ENG. STD. 6610 (E) 15" PVC SEWER STA. 64+18.95 (E) SSMH K09-7 RIM = 226.85' 8" IN 216.92' (NW) 8" IN 216.92' (SW) 15" IN 216.92' (NE) 15" OUT 216.82' (SE) ABANDON (E) SSMH (E) TELE (E) TELE (E) TS (E) TELE (E) 2" GAS (E) 8" PVC WATER G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G SSSSSS SS SS SS SS WW W SS SS SS SS SS SS SS SS SS SD SD SD SD SD SD SD SD SD SD SD SD SD D SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS TS TS TS TS TS TS TS TS TS TS TS TS TS TS TSTSTSTSTS TS T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T EEE E E E E E E E E E E E E EEEE E E E E E E E EEEEEEEE E W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW AW W W W W W W W W W W G G G G G G G T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T W W W W W DU DU DU DU DU DU DU SS SS SS DU DU DU SS SS SS E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E G G G G T T T T T T T T T T T T T T T T T T T TS TT E T T +61 00 +62 00 +63 00 +64 00 STA 60+85.57 (N) SSCO K08-48 RIM = 247.89' SANTA ROSA ST MO N T E R E Y S T 15 ' 24 ' 25 ' 64 ' (E) 10" PVC WATER (1993) (E) 10" GAS ABANDONED (E) 8" CI WATER (N) 334' - 8" HDPE SEWER (E) PG&E CONDUITS (N ) 1 2 " D I P ( 2 7 L F ) (E) 1 8 " R C P (E) 18" RCP (E ) 1 0 " P V C W A T E R (E ) 1 5 " P V C S E W E R (E ) T E L E P H O N E (E ) T E L E P H O N E (E ) 8 " P V C W A T E R (E ) 8 " P V C S E W E R (E ) 2 " G A S (E ) T E L E L P H O N E (E) 15" PVC WATER REMOVE (E) SSMH STA 64+18.95 (E) SSMH K09-7 RIM = 226.85' ABANDON (E) 6" VCP SEWER (E) 10" PVC WATER (1993) ABANDONED (E) 8" CI WATER ABANDON (E) 8" PVC SEWER S=8 . 0 % 2 1 2 RIM 227.27 INV 221.73 RIM 227.27 INV 224.30 REMOVE AND REPLACE SSCO K08-48 PER ENG. STD. 6710 8" OUT 240.00 (E) SSMH K09-7 8" IN 216.92 8" IN 216.92 15" OUT 216.82 15" IN 216.92 CITY SPECIFICATION NO. DATE: PR O J E C T T I T L E : SH E E T T I T L E : of SHEET NO. DESIGNED BY: DRAWN BY: CHECKED BY: APPROVED BY: SCALE: PLAN FILE NO. / LOCATION HN MI L L S T R E E T S E W E R R E P L A C E M E N T HN MB BN SEPTEMBER 2024 2000561 9 APPROVED: XXXX SA N T A R O S A S T R E E T 9 HORIZ1" = 20' VERT 1" = 4' 0 SCALE IN FEET 20 40 CONSTRUCTION NOTES REMOVE (E) 22"X13" CMP AND INSTALL (N) 12" DIP STORM. TRENCH BACKFILL WITH 1 SACK SLURRY CONNECT TO (E) STORMDRAIN STRUCTURE PER ENG. STD. 3540 1 2 MA T C H L I N E - S T A . 6 0 + 5 0 . 0 0 : S E E S H E E T 8 Page 131 of 560 Page 132 of 560 SPECIAL PROVISIONS FOR CITY OF SAN LUIS OBISPO Mill Street Sewer Replacement Specification No. 2000561 September 2024 PUBLIC WORKS DEPARTMENT ENGINEERING DIVISION 919 Palm Street San Luis Obispo, CA 93401 (805) 781-7200 Page 133 of 560 Mill Street Sewer Replacement Specification No. 2000561 Approval Date: October 15, 2024 Hai Nguyen October xx, 2024 Brian Nelson October xx, 2024 Page 134 of 560 TABLE OF CONTENTS NOTICE TO BIDDERS ..................................................................................................... I BID SUBMISSION ...................................................................................................................................... I BID DOCUMENTS .................................................................................................................................... II PROJECT INFORMATION........................................................................................................................ II QUALIFICATIONS .................................................................................................................................... III AWARD .................................................................................................................................................... IV ACCOMMODATION .................................................................................................................................. V BID FORMS .................................................................................................................... A BID ITEM LIST FOR MILL STREET SEWER REPLACEMENT, SPECIFICATION NO. 2000561 ........... A LIST OF SUBCONTRACTORS ................................................................................................................ C PUBLIC CONTRACT CODE SECTION 10285.1 STATEMENT .............................................................. D PUBLIC CONTRACT CODE SECTION 10162 QUESTIONNAIRE ......................................................... D PUBLIC CONTRACT CODE SECTION 10232 STATEMENT ................................................................. D LABOR CODE SECTION 1725.5 STATEMENTS ................................................................................... D NON-COLLUSION DECLARATION .......................................................................................................... F BIDDER ACKNOWLEDGEMENTS .......................................................................................................... G QUALIFICATIONS .................................................................................................................................... H ATTACH BIDDER'S BOND TO ACCOMPANY BID ................................................................................... I SPECIAL PROVISIONS .................................................................................................. 1 DIVISION I GENERAL PROVISIONS ....................................................................................................... 1 1 GENERAL ........................................................................................................................................... 1 4 SCOPE OF WORK ............................................................................................................................. 1 7 LEGAL RELATIONS AND RESPONSIBILITY TO THE PUBLIC ....................................................... 1 8 PROSECUTION AND PROGRESS ................................................................................................... 2 DIVISION II GENERAL CONSTRUCTION ............................................................................................... 2 14 ENVIRONMENTAL STEWARDSHIP ............................................................................................... 2 DIVISION V SURFACINGS AND PAVEMENTS ....................................................................................... 2 39 ASPHALT CONCRETE .................................................................................................................... 2 DIVISION VIII MISCELLANEOUS CONSTRUCTION .............................................................................. 3 77 LOCAL INFRASTRUCTURE ............................................................................................................ 3 DIVISION IX TRAFFIC CONTROL DEVICES........................................................................................... 6 84 MARKINGS ....................................................................................................................................... 6 DIVISION XIII APPENDICES .................................................................................................................... 6 APPENDIX A - FORM OF AGREEMENT ....................................................................... 0 APPENDIX B – PROJECT MITIGATION MEASURES ................................................... 3 APPENDIX C – GEOTECHNICAL REPORTS ................................................................ 4 Page 135 of 560 NOTICE TO BIDDERS i NOTICE TO BIDDERS BID SUBMISSION Sealed bids will be received by the City of San Luis Obispo at the Public Works Administration Office located at 919 Palm Street, San Luis Obispo California, 93401 until 11:00 a.m. on November 21, 2024 at which time they will be publicly opened and read aloud. Public bid opening may be accessed via Microsoft Teams video conference and conference call. In person attendance will be permitted. Attendees are encouraged to wear face masks and practice social distancing. Use the following link: https://teams.microsoft.com/l/meetup- join/19%3ameeting_MzdjYjU1N2ItMTIyMy00YTBiLWExODktYTcyNmM0NGM5NGE3% 40thread.v2/0?context=%7b%22Tid%22%3a%22a78b182d-94e4-4507-a9a9- 330dcb148164%22%2c%22Oid%22%3a%22a8add278-38fa-47c3-8727- acd5a57b58ec%22%7d or join by phone with this number: 1 (209) 645-4165 with Conference ID: 387 397 674# Submit bid in a sealed envelope plainly marked: Mill Stret Sewer Replacement, Specification No. 2000561 Any bid received after the time and date specified will not be considered and will be returned to the bidder unopened. Bids received by Fax or Email will not be considered. By submission of bid you agree to comply with all instruction and requirements in this notice and the contract documents. All bids must be submitted on the Bid Item List form(s) provided and submitted with all other Bid Forms included in these Special Provisions. Each bid must be accompanied by either a: 1. certified check 2. cashier's check 3. bidder's bond made payable to the City of San Luis Obispo for an amount equal to ten percent of the bid amount as a guaranty. Guaranty will be forfeited to the City San Luis Obispo if the bidder, to whom the contract is awarded, fails to enter into the contract. The City of San Luis Obispo reserves the right to accept or reject any or all bids or waive any informality in a bid. All bids are to be compared based on the City Engineer's estimate of the quantities of work to be done, as shown on the Bid Item List. Page 136 of 560 NOTICE TO BIDDERS NOTICE TO BIDDERS ii Bids will only be accepted from bidders that are licensed in compliance with the provisions of Chapter 9, Division III of Business and Professions Code. The award of the contract, if awarded, will be to the lowest responsive bid submitted by a responsible contractor whose bid complies with the requirements prescribed. If the contract is awarded, the contract will be awarded within 60 calendar days after the opening of the bids. Failure to raise defects in the notice to bidders or bid forms prior to bid opening constitute a waiver of those defects. BID DOCUMENTS A copy of the plans and special provisions may be downloaded, free of charge, from the City’s website at: www.slocity.org/government/department-directory/public-works/public-works-bids- proposals No printed copies are available for purchase at the City office. Standard Specifications and Engineering Standards referenced in the Special Provisions may be downloaded, free of charge, from the City’s website at: www.slocity.org/government/department-directory/public-works/documents- online/construction-documents You are responsible to obtain all issued addenda prior to bid opening. Addenda will be available to download at the City’s website listed above or at the office of the City Engineer. All questions must be submitted through Bidsync and if the City determines that a response is required, the City will post an addendum on Bidsync. Contact the project manager, Hai Nguyen at 805-781-7108 or the Public Works Department at (805) 781- 7200 prior to bid opening to verify the number of addenda issued. You are responsible to verify your contact information is correct on the plan holders list located on the City’s website at: www.slocity.org/government/department-directory/public-works/public-works-bids- proposals. PROJECT INFORMATION In general, the project consists of the replacement of existing sewerlines by open trenching. Page 137 of 560 NOTICE TO BIDDERS NOTICE TO BIDDERS iii The project estimated construction cost is $2,400,000. Contract time is established as 70 working days. The fixed liquidated damages amount is established at $500 per day for failure to complete the work within the contract time. In compliance with section 1773 of the Labor Code, the State of California Department of Industrial Relations has established prevailing hourly wage rates for each type of workman. Current wage rates may be obtained from the Division of Labor at: https://www.dir.ca.gov/oprl/DPreWageDetermination.htm This project is subject to compliance monitoring and enforcement by the Department of Industrial Relations. QUALIFICATIONS You must possess a valid Class A or C34 Contractor's License at the time of the bid opening. You and any subcontractors required to pay prevailing wage must be registered with the Department of Industrial Relations pursuant to Section 1725.5 of the Labor Code. Provide two referenced projects completed as the prime contractor and one referenced project completed as either the prime or subcontractor. All referenced projects must have been completed within the last SEVEN years from this project’s bid opening date. All referenced projects must have installed a minimum of 1,500 linear feet of sewerline by open trenching including sewer lateral connections within Public Roadways under contract with a City, County, State or Federal government agency. Failure to provide reference projects as specified in this section and as required on the qualification form is cause to reject a bid as being non-responsive. The City reserves the right to reject any bid based on non-responsiveness if a bidder fails to provide a bid that complies with all bidding instructions. The City reserves the right to reject a responsive bid based on the non-responsibility of the bidder if the Director of Public Works or Designee finds, after providing notice and a hearing to the bidder, that the bidder lacks the 1. knowledge 2. experience, 3. or is otherwise not responsible Page 138 of 560 NOTICE TO BIDDERS NOTICE TO BIDDERS iv as defined in Section 3.24 of the San Luis Obispo Municipal Code to complete the project in the best interest of the City. Rejected bidders may appeal this determination. Appeal must comply with the requirements in this Notice to Bidders. It is the City of San Luis Obispo’s intent to award the contract to the lowest responsive bid submitted by a responsible bidder. If in the bidder’s opinion the contract has been or may be improperly awarded, the bidder may protest the contract award. Protests must be filed no later than five working days after either: 1. bid opening date 2. notification of rejected bid. Protest must be in writing and received by the project manager located at: 919 Palm Street San Luis Obispo, CA 93401. Valid protests must contain the following information: 1. the reasons for the protest 2. any supporting documentation 3. the ruling expected by the City to remedy the protest. Any protest not containing all required information will be deemed invalid and rejected. The City will consider additional documentation or other supporting information regarding the protest if submitted in compliance to the specified time limits. Anything submitted after the specified time limit will be rejected and not be considered. The Director of Public Works or Designee may request additional information to be submitted within three days of the request, unless otherwise specified, and will notify the protester of ruling within ten days of determination. If the protester is not satisfied with ruling, the protester may appeal the ruling to the City Council in compliance with Chapter 1.20 of the City of San Luis Obispo Municipal Code. Pursuant to the Public Records Act (Government Code, § 6250, et seq.), the City will make public records available upon request. AWARD The lowest bidder will be determined using the BID TOTAL As a condition to executing a contract with the City, two bonds each equal to one hundred percent of the total contract price are required in compliance with Section 3-1.05 of the Standard Specifications. Page 139 of 560 NOTICE TO BIDDERS NOTICE TO BIDDERS v You may substitute securities for moneys withheld under the contract in compliance with the provisions of the Public Contract Code, Section 10263. ACCOMMODATION If any accommodations are needed to participate in the bid process, please contact Allie Genard at (805) 781-7200 or by Telecommunications Device for the Deaf at (805) 781- 7107. Requests should be made as early as possible in the bidding process to allow time for accommodation. Page 140 of 560 BID FORMS A BID FORMS All bid forms must be completed and submitted with your bid. Failure to submit these forms and required bid bond is cause to reject the bid as nonresponsive. Staple all bid forms together. THE UNDERSIGNED, agrees that they have carefully examined: 1. the location of the proposed work 2. the plans and specifications 3. read the accompanying instructions to bidders and propose to furnish all: 4. materials 5. labor to complete all the required work satisfactorily in compliance with 6. plans 7. specifications 8. special provisions for the prices set forth in the bid item list: BID ITEM LIST FOR MILL STREET SEWER REPLACEMENT, SPECIFICATION NO. 2000561 Item Item Unit of Estimated Item Price Total No. SS(1) Description Measure Quantity (in figures) (in figures) 1 7 TRAFFIC CONTROL PLAN AND IMPLEMENTATION LS 1 --------------- 2 77 POTHOLING LS 1 --------------- 3 84 REPLACE TRAFFIC STRIPING & MARKERS LS 1 --------------- 4 7 COMPLY WITH OSHA LS 1 --------------- 5 14 COMPLY WITH MITIGATION MEASURES AND ARCHAEOLOGICAL MONITORING PLAN LS 1 --------------- 6 77 ABANDON SEWERLINE, MANHOLES AND FACILITIES LS 1 --------------- 7 77 SEWER BYPASS PUMPING LS 1 --------------- 8* 19 ROCK EXCAVATION CY 100 9 5,15 REPLACE MONUMENT AND WELL EA 2 10 77 REMOVE EXISTING SEWERLINE AND INSTALL NEW 8" HDPE SEWERLINE BY OPEN TRENCHING LF 3595 11 77 INSTALL NEW MANHOLE EA 6 Page 141 of 560 BID FORMS BID FORMS B Item Item Unit of Estimated Item Price Total No. SS(1) Description Measure Quantity (in figures) (in figures) 12 77 INSTALL COATING ON NEW MANHOLE EA 8 13 77 REMOVE EXISTING MANHOLE EA 7 14 77 REMOVE EXISTING AND INSTALL NEW CLEANOUT EA 4 15 77 CONNECT EXISTING SEWER LATERAL TO SEWER MAIN EA 77 16 73 REPLACE CROSS GUTTER PER ENG. STD. 4310 SQFT 30 17 77 REPLACE WATER WELL AND COVER PER ENG. STD. 6340 LF 1 18 77 REMOVE EXISTING AND INSTALL CITY COMM MANHOLE PER ENG. STD. 9030 EA 1 19 77 REMOVE EXISTING AND INSTALL NEW 12" DIP STORMDRAIN LF 27 20 77 CONNECT TO (E) STORMDRAIN STRUCTURE PER ENG. STD. 3540 EA 2 21 77 CONNECT TO (E) SEWER MANHOLE PER ENG. STD. 6610 EA 3 22* 77 RE‐GRADE SEWER LATERAL BEYOND 5 FEET LF 100 23* 39, 96 PAVING GRID SQYD 100 Bid Total $ Company Name: (1) refers to section in the Standard Specifications, with modifications in the Special Provisions, that describe required work. * Bid item exempt from Section 9-1.06B and 9-1.06C of the Standard Specifications. The unit price will not be adjusted regardless of the final bid item quantity. . Page 142 of 560 BID FORMS BID FORMS C LIST OF SUBCONTRACTORS Pursuant to Section 4100 of the Public Contracts Code and section 2-1.33C of the standard specifications, the Bidder is required to furnish the following information for each Subcontractor performing more than 1/2 percent (0.5%) of the total base bid. Do not list alternative subcontractors for the same work. Subcontracting must not total more than fifty percent (50%) of the submitted bid except as allowed in section 5-1.13 of the standard specifications. For Streets & Highways projects, subcontractors performing less than ten thousand dollars ($10,000) worth of work need not be mentioned. Subcontractors required to pay prevailing wage, must be registered with the Department of Industrial Relations pursuant to Labor Code section 1725.5 to be listed. NOTE: If there are no subcontractors, write “NONE” and submit with bid. Name Under Which Subcontractor is Licensed License Number DIR Public Works Registration Number Address and Phone Number of Office, Mill or Shop Specific Description of Subcontract % of Total Base Bid Attach additional sheets as needed. Page 143 of 560 BID FORMS BID FORMS D PUBLIC CONTRACT CODE SECTION 10285.1 STATEMENT In compliance with Public Contract Code Section 10285.1 (Chapter 376, Stats. 1985), the bidder hereby declares under penalty of perjury under the laws of the State of California that the bidder, or any subcontractor to be engaged by the bidder, has ____, has not ____ been convicted within the preceding three years of any offenses referred to in that section, including any charge of fraud, bribery, collusion, conspiracy, or any other act in violation of any state or federal antitrust law in connection with the bidding upon, award of, or performance of, any public works contract, as defined in Public Contract Code Section 1101, with any public entity, as defined in Public Contract Code Section 1100, including the Regents of the University of California or the Trustees of the California State University. The term "bidder" is understood to include any partner, member, officer, director, responsible managing officer, or responsible managing employee thereof, as referred to in Section 10285.1. NOTE: The bidder must place a check mark after "has" or "has not" in one of the blank spaces provided. The above Statement is part of the Bid. Signing this Bid on the signature portion constitute signature of this Statement. Bidders are cautioned that making a false certification may subject the certifier to criminal prosecution. PUBLIC CONTRACT CODE SECTION 10162 QUESTIONNAIRE In compliance with Public Contract Code Section 10162, the Bidder must complete, under penalty of perjury, the following questionnaire: Has the bidder, any officer of the bidder, or any employee of the bidder who has a proprietary interest in the bidder, ever been disqualified, removed, or otherwise prevented from bidding on, or completing a federal, state, or local government project because of a violation of law or a safety regulation? Yes No If the answer is yes, attach a letter explaining the circumstances PUBLIC CONTRACT CODE SECTION 10232 STATEMENT In compliance with Public Contract Code Section 10232, you hereby state under penalty of perjury, that no more than one final unappealable finding of contempt of court by a federal court has been issued against you within the immediately preceding two-year period because of your failure to comply with an order of a federal court which orders you to comply with an order of the National Labor Relations Board. LABOR CODE SECTION 1725.5 STATEMENTS The bidder has delinquent liability to an employee or the state for any assessment of back wages or related damages, interest, fines, or penalties pursuant to any final judgment, order, or determination by a court or any federal, state, or local administrative agency, including a confirmed arbitration award. Any judgment, order, or determination that is Page 144 of 560 BID FORMS BID FORMS E under appeal is excluded, provided that the contractor has secured the payment of any amount eventually found due through a bond or other appropriate means. Yes No The bidder is currently debarred under Section 1777.1 or under any other federal or state law providing for the debarment of contractors from public works. Yes No NOTE: The above Statements and Questionnaire are part of the Bid. Signing this Bid on the signature portion constitute signature of this Statement and Questionnaire. Bidders are cautioned that making a false certification may subject the certifier to criminal prosecution. Page 145 of 560 BID FORMS BID FORMS F NON-COLLUSION DECLARATION I, , declare that I am of , the party making the foregoing bid that the bid is not made in the interest of, or on behalf of, any undisclosed person, partnership, company, association, organization, or corporation; that the bid is genuine and not collusive or sham; that the bidder has not directly or indirectly induced or solicited any other bidder to put in a false or sham bid, and has not directly or indirectly colluded, conspired, connived, or agreed with any bidder or anyone else to put in a sham bid, or that anyone refrained from bidding; that the bidder has not in any manner, directly or indirectly, sought by agreement, communication, or conference with anyone to fix the bid price of the bidder or any other bidder, or to fix any overhead, profit, or cost element of the bid price, or of that of any other bidder, or to secure any advantage against the public body awarding the contract of anyone interested in the proposed contract; that all statements contained in the bid are true; and, further, that the bidder has not, directly or indirectly, submitted his or her bid price or any breakdown thereof, or the contents thereof, or divulged information or data relative thereto, or paid, and will not pay, any fee to any corporation, partnership, company association, organization, bid depository, or to any member or agent thereof to effectuate a collusive or sham bid. Executed on , 20 , in __ I declare under penalty of perjury under the laws of the State of California that the foregoing is true and correct. (Signature and Title of Declarant) (SEAL) Subscribed and sworn to before me this _______day of _________, 20_____ Notary Public Company Name:____________________ Page 146 of 560 BID FORMS BID FORMS G BIDDER ACKNOWLEDGEMENTS By signing below, the bidder acknowledges and confirms that this bid is based on the information contained in all contract documents, including the notice to bidders, plans, specifications, special provisions, and addendum number(s) . (Note: You are responsible to verify the number of addenda prior to the bid opening.) The undersigned further agrees that in case of default in executing the required contract, with necessary bonds, within eight days, (not including Saturdays, Sundays, and legal holidays), after having received a mailed notice that the contract is ready for signature, the proceeds of the check or bond accompanying his bid will become the property of the City of San Luis Obispo. Licensed in accordance with an act providing for the registration of contractors, License No. , Expiration Date . The above statement is made under penalty of perjury, and any bid not containing this information "will be considered non-responsive and will be rejected” by the City. Signature of Bidder (Print Name and Title of Bidder) DIR– Public Works Registration No: Business Name (DBA): Owner/Legal Name: Indicate One: Sole-proprietor Partnership Corporation List Partners/Corporate Officers: Name Title Name Title Name Title Business Address Street Address Mailing Address City, State, Zip Code Phone Number Fax Number Email Address Date Page 147 of 560 BID FORMS BID FORMS H QUALIFICATIONS Failure to furnish complete reference information ON THIS FORM, as specified in this project’s Notice to Bidders and indicated below, is cause to reject the bid. Additional information may be attached but is not a substitute for this form. Reference Number 1 Customer Name & Contact Individual Telephone & Email Project Name (Site Address): Did this project install a minimum of 1,500 LF of sewerline by open trenching within public roadways? Yes □ No □ Describe the services provided and how this project is similar to that which is being bid: Date project completed: Was this contract for a public agency? Yes □ No □ Reference Number 2 Customer Name & Contact Individual Telephone & Email Project Name (Site Address): Did this project install a minimum of 1,500 LF of sewerline by open trenching within public roadways? Yes □ No □ Describe the services provided and how this project is similar to that which is being bid: Date project completed: Was this contract for a public agency? Yes □ No □ Reference Number 3 Customer Name & Contact Individual Telephone & Email Project Name (Site Address): Did this project install a minimum of 1,500 LF of sewerline by open trenching within public roadways? Yes □ No □ Describe the services provided and how this project is similar to that which is being bid: Date project completed: Was this contract for a public agency? Yes □ No □ Page 148 of 560 BID FORMS BID FORMS I ATTACH BIDDER'S BOND TO ACCOMPANY BID Know all men by these presents: That we ____________________________________________, AS PRINCIPAL, and _______________________________________________________, AS SURETY, are held and firmly bound unto the City of San Luis Obispo in the sum of: ____________________________________________________ Dollars (_____________) to be paid to said City or its certain attorney, its successors and assigns; for which payment, well and truly to be made, we bind ourselves, our heirs, executors and administrators, successors or assigns, jointly and severally, firmly by these presents: THE CONDITION OF THIS OBLIGATION IS SUCH, that if the certain bid of the above bounden ______________________________________________________________________ to construct ___________________________________________________________________ (insert name of street and limits to be improved or project) dated _____________________ is accepted by the City of San Luis Obispo, and if the above bounden _______________________________________________________, his heirs, executors, administrators, successors, and assigns shall duly enter into and execute a contract for such construction and shall execute and deliver the two bonds described within ten (10) days (not including Saturdays, Sundays, or legal holidays) after the above bounden, ______________________________________________________, has received notice by and from the said City of San Luis Obispo that said contract is ready for execution, then this obligation shall become null and void; otherwise, it shall be and remain in full force and virtue. IN WITNESS WHEREOF, we hereunto set our hands and seals this ___ day of ______, 20____. Bidder Principal: Signature Date Title: Surety: Bidder's signature is not required to be notarized. Surety's signature must be notarized. Equivalent form may be substituted (Rev. 6-30-14) Page 149 of 560 SPECIAL PROVISIONS 1 SPECIAL PROVISIONS ORGANIZATION Special provisions are under headings that correspond with the main section heading of the Standard Specifications. Each special provision begins with a revision clause that describes or introduces a revision to the Standard Specifications. Any paragraph added or deleted by a revision clause does not change the paragraph number of the Standard Specifications for any other reference to a paragraph of the Standard Specifications. DIVISION I GENERAL PROVISIONS 1 GENERAL Add to Section 1-1.01 GENERAL: The work must be done in compliance with the City of San Luis Obispo, Department of Public Works: 1. Mill Street Sewer Replacement Special Provisions 2. City of San Luis Obispo Standard Specifications and Engineering Standards – 2020 edition 3. State of California, Department of Transportation Standard Specifications and Standard Plans – 2015 edition In case of conflict between documents, governing ranking must comply with section 5- 1.02 of the City of San Luis Obispo’s Standard Specifications. Failure to comply with the provisions of these sections is a material breach of contract: 1. Sections 5 through 8 of the Standard Specifications 2. Section 12 through 15 of the Standard Specifications 3. Section 77-1 of the Standard Specifications 4. Section 81 of the Standard Specifications 5. authorized working hours 6. OSHA compliance 4 SCOPE OF WORK Add to Section 4-1.03 WORK DESCRIPTION: Comply with the provisions of Sections 5, 7, 14, 15, 19, 39, 73, 77, 84 and 96 for general, material, construction, and payment specifics. 7 LEGAL RELATIONS AND RESPONSIBILITY TO THE PUBLIC Add to Section 7-1.03B PUBLIC CONVENIENCE, Traffic Control Plan All other work must be completed during normal working hours of Monday through Friday 7:00 a.m. to 4:00 p.m. Page 150 of 560 SPECIAL PROVISIONS SPECIAL PROVISIONS 2 No full width street closures will be permitted. Traffic control plans should consider any lane closures based on the following list of priorities (in order of most desired to least desired option): 1. Restrict parking on one or both sides as necessary in order to maintain two-way traffic circulation with minimum 10’ travel lanes 2. Two-way circulation with flaggers and minimum 10’ travel lane Provide traffic control plan and traffic control application at or before the preconstruction meeting. Traffic control plan must be drawn to scale. Traffic control application may be obtained on the City’s website: www.slocity.org/government/department-directory/public-works/documents- online/construction-documents Upon approval of the traffic control plan, the City will issue a no-fee Encroachment Permit. Permittee is responsible to comply with all conditions of the traffic control plan. Complete work using due diligence to restore free flowing of traffic. 8 PROSECUTION AND PROGRESS Replace the 1st paragraph in Section 8-1.02A SCHEDULE, General with: Provide a Level 1 schedule for this work. DIVISION II GENERAL CONSTRUCTION 14 ENVIRONMENTAL STEWARDSHIP Add to Section 14-2.03A ARCHAEOLOGICAL RESOURCES, General Archaeological monitoring will be required due to proximity to archaeological sensitive areas. Monitoring will be performed by a consultant hired by the City. The contractor must comply with the Project Mitigation Measures approved through ER 10-07 and Archaeological monitoring plan (Appendix B). If archaeological cultural resources are identified during monitoring, the monitor will be empowered to halt construction. No additional payment will be made to the contractor for right of way delays. Full compensation for conforming to the requirements of this section shall be included in the lump sum price and no additional compensation will be allowed, therefore. DIVISION V SURFACINGS AND PAVEMENTS 39 ASPHALT CONCRETE Add to Section 39-1.02B MATERIALS, Tack Coat All vertical edges and surfaces to be paved against shall be tack coated. These include, but are not limited to, curb faces, gutter lips, swale edges, cross gutter edges, and asphalt concrete edges. Page 151 of 560 SPECIAL PROVISIONS SPECIAL PROVISIONS 3 Replace Section 39-1.02F MATERIALS, Reclaimed Asphalt Pavement (RAP) with: Asphalt concrete with 25% RAP may be used for paving operations. DIVISION VIII MISCELLANEOUS CONSTRUCTION 77 LOCAL INFRASTRUCTURE Add to Section 77-1.03A(3) Groundwater Float rock may be substituted for initial backfill when ground water is present per Engineering Standard 6020. Full compensation for removing water or dewatering excavations and backfilling with float rock is included in the payment for other bid items unless a bid item of work is shown on the Bid Item List. Add to Section 77-1.03B(1) TRENCH CONSTRUCTION, General All abandoned waterlines encountered partially or entirely within the trench section for the new waterline must be removed and disposed of. The active/abandoned status of all waterlines has been shown on the plans. The Contractor must notify the City immediately if any waterline shown as abandoned is found to be active. If, at any point during the project, a trench is excavated within 5 feet of the wall of the trench, of an active utility such as a waterline, or any other utility that could potentially break, the Contractor must provide shoring as necessary to prevent movement of existing lines. Add to Section 77-1.03D Surface Restoration Geotechnical borings and potholing of existing utilities indicate that the following streets are paved with AC over PCC and must be repaired with AC/PCC per Engineering Standard 4110 & 6020. Intersection of Santa Rosa and Mill Intersection of Santa Rosa and Palm Intersection of Santa Rosa and Monterey Mill Street (Santa Rosa to Pepper) Morro and Toro are paved with 4 inches to 6 inches of AC. Repair trench paving must be with 6 inches of AC. All other streets are paved with 4 inches to 10 inches of AC. Repair trench paving must be with 10 inches of AC. Streets which contain a reinforcement fabric or grid must be “tee cut” with the width of the AC cut extending one foot beyond each side of the trench. A new layer of pavement reinforcing grid must be installed to match the existing pavement section. Add to Section 77-3.02A(5) Sewer Lateral Pipe Sewer lateral wyes must be fused HDPE. All PVC and HDPE pipe connections must be made with POLY-CAM Series 731 transition couplings. All VCP and HDPE pipe Page 152 of 560 SPECIAL PROVISIONS SPECIAL PROVISIONS 4 connections must made with POLY-CAM Series 731 transition couplings and Strong Back RC couplings. Add to Section 77-3.03A(3) HDPE Pipe Joint HDPE pipes jointed by heat fusion welding must be internally debeaded prior to installation. Add to Section 77-3.03C Bypass Pumping The Contractor must provide for the flow of sewage around the section or sections of pipe designated for repair. The pump(s) and bypass line(s) must be of adequate capacity to accommodate a sewage flow of 100,000 gallons per day. Add Section 77-3.03D Manhole Coating The existing manholes are coated and must be sand blasted and removed prior to the application of the new coating system. Coating manholes shall include the following activities: • Cleaning the manhole and prepare the manhole for one of the approved coating systems. • Applying one of the approved coating systems, as specified herein. • Testing the finished surface coating, as required herein. • Other related activities, as noted herein. Where designated in the plans, manholes must be coated with an approved corrosion protective coating applied to their interior surfaces, as specified herein. The approved coating system (as specified herein) shall be applied to all exposed brick, concrete, grout, mortar, and cementitious surfaces within the manhole, including unlined concrete pipes within the manhole, bench-to-pipe transitions, bench, risers, cones, adjusting rings, etc. Coating of the metallic manhole frame and cover shall not be required. The Contractor shall coat all manholes marked on the plans with a high-build polyurethane elastomer such as SANCON 100 or approved equal. The minimum thickness of 80 mils of elastomeric polyurethane must be applied. The Contractor is responsible for inspecting the existing manholes for leaks or concrete failures. The Contractor shall repair manhole prior to coating by patch or chemical grouting in accordance with coating manufacture recommendation and as directed by the Engineer. Coating shall stop at the top of the cone or as directed by the Engineer. All pipe liner installation shall be completed prior to commencing any coating of manholes. The Contractor shall provide a smooth transition and tight seal without any annular gaps between the completed manholes and the completed sewer pipe. The Contractor shall Spark Test the new manhole per NACE RP0274 standards. Spark Test shall be witnessed by the Engineer. Page 153 of 560 SPECIAL PROVISIONS SPECIAL PROVISIONS 5 The Contractor shall terminate the coating at the spring line of the channel with a 1/4" cut groove. Materials shall be delivered to the site in factory sealed and labeled containers. Date of manufacture shall appear on each container. Materials shall be handled and stored according to the strictest requirements of the manufacturer and in accordance with all local, state and federal laws and regulations. At each manhole, the Engineer shall inspect and accept the work completed to-date at the completion of each of milestones listed below before the Contractor shall commerce work on the next milestone: Completion of the cleaning and surface preparation activities required by these specifications. Completion of all void-filling activities and underlayment application, prior to surface coating application. Completion of the surface coating installation prior to testing. Spark testing of the final surface coating as required by these specifications. Final clean-up and inspection. The Contractor shall provide a written warranty to cover workmanship and materials for each manhole coated with an approved corrosion protective coating for a period of not less than five (5) years from the date of final acceptance of the project. The warranty shall be delivered to the City prior to and as a condition of final acceptance for this project. By executing this contract, the Contractor certifies and agrees that any testing performed by the City during construction (e.g., spark testing, adhesion testing and/or other testing) shall not in any way modify the warranty, nor relieve the Contractor for responding to defects during the warranty period. Replace Section 77-3.03E Sewer Laterals with: The Contractor must locate all existing sewer laterals and re-establish all live sewer lateral connections. Contractor must test all laterals using dye testing to confirm which laterals are in service (active) and which are dead. Dead or unused sewer laterals must be abandoned per Engineering Standard 6050. No payment shall be made for laterals that are determined to be out of service. The Contractor must provide portable restrooms, one per lateral closed unless an agreement is reached between the Contractor and affected resident or business that a portable restroom is not necessary. All agreements must be in writing and a copy given to the Engineer. Portable restrooms must be placed at a location preferred by the affected resident or business, and they must be sanitized and cleaned as directed by the Engineer. All portable restrooms must be removed from the public right away or private property at the end of each working day. The Contractor must immediately notify residents after their active sewer laterals are opened. Laterals must be put back into service the same day they are taken out of service. Page 154 of 560 SPECIAL PROVISIONS SPECIAL PROVISIONS 6 The Contractor must notify affected residents and businesses a minimum of 7 calendar days prior to installation and give a 24-hour reminder prior to installation. The Contractor must state in the notification that the owner must not use the sewer system, length of time the sewer will be unavailable, the contact person, and that a portable restroom with a hand washing station will be provided for their use during construction. The notification must state that an ADA accessible restroom will be provided upon request. Payment for all work necessary to reconnect live sewer laterals to the new sewer line including re-grading of existing sewer laterals within 5 horizontal feet of point of connection to new sewer line shall be included in the contract price per connection for bid item “Connect Existing Sewer Lateral to Sewer Main.” The work necessary to re-grade existing sewer laterals to align with the new wye, in excess of 5 horizontal feet from the point of connection to the (N) sewer line, shall be paid by the lineal foot contract price for bid item “Re-grade Sewer Lateral Beyond 5 Feet.” DIVISION IX TRAFFIC CONTROL DEVICES 84 MARKINGS Add to Section 84-2.03C Application of Stripes and Markings: Preformed thermoplastic is not allowed. DIVISION XIII APPENDICES Add 100-1.01 Appendices 1. Appendix A - Form of Agreement 2. Appendix B – Project Mitigation Measures 3. Appendix C - Geotechnical Reports Page 155 of 560 APPENDIX APPENDIX 0 APPENDIX A - FORM OF AGREEMENT THIS AGREEMENT, made on _____________, by and between the City of San Luis Obispo, a municipal corporation and charter city, San Luis Obispo County, California (hereinafter called the Owner) and COMPANY NAME (hereinafter called the Contractor). WITNESSETH: That the Owner and the Contractor for the consideration stated herein agree as follows: ARTICLE 1, SCOPE OF WORK: The Contractor shall perform everything required to be performed, shall provide and furnish all of the labor, materials, necessary tools, expendable equipment, and all utility and transportation services required to complete all the work of construction of NAME OF PROJECT, SPEC NO. in strict compliance with the plans and specifications therefor, including any and all Addenda, adopted by the Owner, in strict compliance with the Contract Documents hereinafter enumerated. It is agreed that said labor, materials, tools, equipment, and services shall be furnished and said work performed and completed under the direction and supervision and subject to the approval of the Owner or its authorized representatives. ARTICLE II, CONTRACT PRICE: The Owner shall pay the Contractor as full consideration for the faithful performance of this Contract, subject to any additions or deductions as provided in the Contract Documents, the contract prices as follows: Item No. Item Unit of Measure Estimated Quantity Item Price (in figures) Total (in figures) 1. 2. 3. BID TOTAL: $ .00 Payments are to be made to the Contractor in compliance with and subject to the provisions embodied in the documents made a part of this Contract. Should any dispute arise respecting the true value of any work omitted, or of any extra work which the Contractor may be required to do, or respecting the size of any payment to the Contractor, during the performance of this Contract, said dispute shall be decided by the Owner and its decision shall be final, and conclusive. Page 156 of 560 APPENDIX APPENDIX 1 ARTICLE III, COMPONENT PARTS OF THIS CONTRACT: The Contract consists of the following documents, all of which are as fully a part thereof as if herein set out in full, and if not attached, as if hereto attached: 1. Notice to Bidders and Information for Bidders 2. Standard Specifications and Engineering Standards 3. Special Provisions, any Addenda, Plans and Contract Change Orders 4. Caltrans Standard Specifications and Standard Plans 2015 5. Accepted Bid and Bid Bond 6. List of Subcontractors 7. Public Contract Code Sections 10285.1 Statement 8. Public Contract Code Section 10162 Questionnaire 9. Public Contract Code Section 10232 Statement 10. Labor Code Section 1725.5 Statements 11. Bidder Acknowledgements 12. Qualifications 13. Non-collusion Declaration 14. Agreement and Bonds 15. Insurance Requirements and Forms ARTICLE IV INDEMNIFICATION: The Contractor shall indemnify, defend with legal counsel approved by City, and hold harmless City, its officers, officials, employees and volunteers from and against all liability, loss, damage, expense, cost (including without limitation reasonable legal counsel fees, expert fees and all other costs and fees of litigation) of every nature arising out of or in connection with the Contractor’s negligence, recklessness or willful misconduct in the performance of work hereunder or its failure to comply with any of its obligations contained in this Agreement, except such loss or damage which is caused by the sole or active negligence or willful misconduct of the City. Should conflict of interest principles preclude a single legal counsel from representing both the City and the Contractor, or should the City otherwise find the Contractor’s legal counsel unacceptable, then the Contractor shall reimburse the City its costs of defense, including without limitation reasonable legal counsel fees, expert fees and all other costs and fees of litigation. The Contractor shall promptly pay any final judgment rendered against the City (and its officers, officials, employees and volunteers) with respect to claims determined by a trier of fact to have been the result of the Contractor’s negligent, reckless or wrongful performance. It is expressly understood and agreed that the foregoing provisions are intended to be as broad and inclusive as is permitted by the law of the State of California and will survive termination of this Agreement. The Contractor obligations under this section apply regardless of whether such claim, charge, damage, demand, action, proceeding, loss, stop notice, cost, expense, judgment, civil fine or penalty, or liability was caused in part or contributed to by an Indemnitee. However, without affecting the rights of the City under any provision of this agreement, the Contractor shall not be required to indemnify and hold harmless the City for liability attributable to the active negligence of City, provided such active negligence is determined by agreement between the parties or by the findings of a court of competent jurisdiction. In Page 157 of 560 APPENDIX APPENDIX 2 instances where the City is shown to have been actively negligent and where the City’s active negligence accounts for only a percentage of the liability involved, the obligation of the Contractor will be for that entire portion or percentage of liability not attributable to the active negligence of the City. ARTICLE V. It is further expressly agreed by and between the parties hereto that should there be any conflict between the terms of this instrument and the bid of said Contractor, then this instrument shall control and nothing herein shall be considered as an acceptance of the said terms of said bid conflicting herewith. IN WITNESS WHEREOF, the parties to these presents have hereunto set their hands this year and date first above written. CITY OF SAN LUIS OBISPO A Municipal Corporation __________________________________ Whitney McDonald, City Manager APPROVED AS TO FORM CONTRACTOR: Name of Company ________________________________ By:________________________________ J. Christine Dietrick City Attorney Name of CAO/President Its: CAO/PRESIDENT (2nd signature required if Corporation): By:________________________________ Name of Corporate Officer Its: ____________________ Page 158 of 560 APPENDIX APPENDIX 3 APPENDIX B – PROJECT MITIGATION MEASURES Page 159 of 560 Page 160 of 560 Page 161 of 560 Mill Street Sewer Replacement Project Cultural Resources Monitoring Plan prepared for City of San Luis Obispo Public Works Department 919 Palm Street San Luis Obispo, California 93401 prepared by Rincon Consultants, Inc. 1530 Monterey Street, Suite D San Luis Obispo, California 93401 July 2024 Page 162 of 560 Please cite this Plan as follows: Gonzalez, Matthew, Ken Victorino, Christopher Duran 2024 Mill Street Sewer Replacement Project Cultural Resources Monitoring Plan, San Luis Obispo, California. Rincon Consultants Project No. 24-16377. Report on file at Rincon Consultants, Inc. 180 North Ashwood Avenue Ventura, California 93001. Page 163 of 560 Table of Contents Cultural Resources Monitoring Plan i Table of Contents 1 Introduction ....................................................................................................................................1 Background .........................................................................................................................1 Project Location and Description ........................................................................................1 IS-MND Mitigation Measure ...............................................................................................2 Archaeological Resource Preservation Program Guidelines ...............................................3 Cultural Resource Sensitivity ..............................................................................................4 2 Monitoring Procedures ...................................................................................................................7 Archaeological Construction Monitoring Requirements ....................................................7 3 Archaeological Resources Discovery Plan .......................................................................................9 Discovery of Archaeological Resources ..............................................................................9 Discovery of Human Remains .......................................................................................... 10 4 Reporting of Monitoring Results and Curation of Finds .............................................................. 11 Reporting of Archaeological Monitoring Results ............................................................. 11 Curation of Archaeological Finds ..................................................................................... 11 5 Contacts ....................................................................................................................................... 12 6 References ................................................................................................................................... 13 Figures Figure 1 Regional Location Map .......................................................................................................0 Figure 2 Aerial Map ...........................................................................................................................1 Appendices Appendix A Figures Page 164 of 560 City of San Luis Obispo Mill Street Sewer Replacement Project ii This page intentionally left blank. Page 165 of 560 City of San Luis Obispo Mill Street Sewer Replacement Project Cultural Resources Monitoring Plan 1 1 Introduction Rincon Consultants, Inc. (Rincon) was retained by the City of San Luis Obispo (City) to prepare a Cultural Resources Monitoring Plan (CRMP) in support of the Mill Street Sewer Replacement Project (project) in San Luis Obispo, California. The project proposes to replace existing sewer lines in downtown San Luis Obispo, which is an area designated as archaeologically sensitive (Figure 1 and 2: Appendix A). Therefore, this CRMP includes a records search conducted through the California Historical Resources Information System (CHRIS) Central Coast Information Center (CCIC) located at the Santa Barbara Museum of Natural History and a vibration assessment. Background An Initial Study – Mitigated Negative Declaration (IS-MND) Environmental Checklist form was completed in 2007 for trenching projects that would occur within the City’s public streets that are located within the City’s Archaeologically Sensitive Areas (City of San Luis Obispo 2007). The City’s Archaeological Resource Preservation Program Guidelines (ARPPG) define Archaeologically Sensitive Areas as those locations inside, or within 200 feet of, the boundaries of a known archaeological site; properties within 200 feet of the top of banks of major creeks; and areas inside a designated Historical District as shown on the City’s archaeological sensitivity maps on file at the Community Development Department (City of San Luis Obispo 2009). As a result of the IS-MND mitigation measures, specifically Cultural Resources Mitigation Measure 2, the City requires a CRMP to be developed for all trenching projects within these archaeologically sensitive areas, consistent with the City’s ARPPG (City of San Luis Obispo 2009). The current project is located between Old Garden/Brizzolara creek and San Luis Obispo creek, and partially within the boundaries of the Downtown, Chinatown, and Mill Street Historic Districts. Therefore, this CRMP summarizes the CHRIS CCIC records search for the project. In addition, because the current project is located within the narrow rights-of-ways (ROWs) partially within the boundaries of the Downtown, Chinatown, and Mill Street Historic Districts, a vibration assessment was conducted to assist the City in protecting the historic-period buildings located immediately adjacent to the project. A brief summary of the vibration assessment is provided below. The CRMP will outline the procedures and protocols for archaeological monitoring required by Cultural Resources Mitigation Measure 2 from the 2007 IS-MND, and will be consistent with the City’s ARPPG (City of San Luis Obispo 2007, 2009) for archaeological monitoring activities. Project Location and Description The project is located in downtown San Luis Obispo, between Old Garden/Brizzolara creek and San Luis Obispo creek, partially within the boundaries of the Downtown, Chinatown, and Mill Street Historic Districts. Specifically, the project is located within Township 30 South, Range 12 East, Section 26 of the San Luis Obispo, California United States Geological Survey (USGS) 7.5-minute topographic map (Figure 1: Appendix A). Page 166 of 560 City of San Luis Obispo Mill Street Sewer Replacement Project 2 The project will install approximately 0.75 mile of sewer lines within the Morro Street, Mill Street, Toro Street, and Santa Rosa Steet ROWs in downtown San Luis Obispo (Figure 2: Appendix A). The proposed project excavations for the sewer lines will reach depths between 5 and 10 feet. Most, if not all of the excavations will occur within soils which were previously disturbed during the installation of the existing sewer lines. During construction, the following equipment would be used: excavator, backhoe, jumping jacks, roller, dump trailer, and a jackhammer. Rollers (assumed to be vibratory rollers) and large earthmoving equipment (such as an excavator and backhoe). IS-MND Mitigation Measure Cultural Resources a) b) c) d) Evaluation The 2007 IS-MND for Utility Trenching in projects in the City of San Luis Obispo states: Although projects may be in archaeologically sensitive areas as defined by the City’s Historical Preservation Program Guidelines [now ARPPG], the installation and replacement of utility within City streets will affect only previously disturbed and paved areas. Because the roadways are completely paved, no archaeological artifacts or features will be observable during pedestrian surveys. Although segments of trenching for utilities potentially pass by significant historical structures, construction will be limited to the roadbed and will not impact these buildings. Thus, no architectural evaluations or assessments are required for specific projects. Through archival research [and] the proximity of the creek these areas are considered to have an elevated potential for buried cultural deposits. Although it is unlikely that the remains of previous structures are present within the roadbed, the land the Historical Archaeological District (Downtown Core) and within 200 feet of the top of San Luis Obispo, Stenner, Brizzolara, Acacia, Old Garden, Prefumo and Froom Creeks, have been subject to human activity for at least 130 years. Moreover, prehistoric sites are typically found near water sources. Trenching in undisturbed soils would markedly increase the likelihood that archaeological remains would be encountered during utility installation. It is recommended that all trenching projects in designated archaeological sensitive areas be monitored during utility line trenching and construction (City of San Luis Obispo 2007). Cultural Resources Mitigation Measure 2 Cultural Resources Mitigation Measure 2 of the 2007 IS-MND states: Areas within the Historical Archaeological District and 200 feet of the top of San Luis Obispo, Stenner, Brizzolara, Acacia, Old Garden, Prefumo and Froom Creeks are designated as archaeologically sensitive and shall be monitored during utility line trenching and construction projects. The Applicant shall submit an archaeological monitoring plan [CRMP] to the Community Development Director prior to Encroachment Permit issuance for these projects, consistent with the requirements of the City’s Archaeological Resource Preservation Guidelines. The plans shall cover both the demolition/excavation and installation aspects of the projects. Plans must identify the qualified historical archaeologist who will conduct the monitoring and include recommendations for specific procedures for responding to the discovery of archaeological resources during the demolition and construction of the project. If Native American artifacts or human remains are discovered within the project area, then the qualified Native American tribal representative or cultural community advisor shall be included as project monitors. The project archaeologist shall review the final engineering plans for the project to Page 167 of 560 City of San Luis Obispo Mill Street Sewer Replacement Project Cultural Resources Monitoring Plan 3 determine the exact impact and recommend if further studies are required as part of implementation of the plan (City of San Luis Obispo 2007). Archaeological Resource Preservation Program Guidelines City of San Louis Obispo Archaeological Resources Preservation Program Guidelines: Monitoring of Construction Activities Section 4.40.3.2: Archaeological Discoveries During Construction Site security: Site security shall be maintained by fencing and a resident caretaker or private professional security personnel, or other appropriate method to protect the resources from unauthorized collection to the Community Development Director’s (Director) approval. Site security measures shall be provided at the project applicant’s expense (City of San Luis Obispo 2009). Section 4.40.3.3: Discovery of Human Remains If human remains are exposed, there shall be no further excavation or site disturbance in the area likely to contain human remains until: A. The County Coroner has been informed and determined that no investigation of cause of death is required; and B. If remains are likely to be of Native American origin, the Coroner has contacted the NAHC, which will designate a Most Likely Descendant (MLD). The MLD may recommend the most appropriate disposition of the human remains and associated grave goods to the landowner or other responsible party, as provided in Health and Safety Code Section 7052 and 7050.5, and as provided in Public Resources Code Section 5097.98 and Section 15064.5(e) of the CEQA Guidelines. C. Remains and grave goods uncovered must be documented as required by state law, or to the approval of the Director. D. Where the following conditions occur, the landowner or authorized representative shall rebury the Native American human remains and associated grave goods with appropriate dignity on the property in a location not subject further subsurface disturbance: i. The NAHC is unable to identify a MLD, or the MLD failed to make a recommendation within 24 hours after being notified by the NAHC; ii. The MLD identified fails to make a recommendation; or iii. The landowner or authorized representative rejects the recommendation of the MLD and mediation by the NAHC fails to provide measures acceptable to the landowner. Section 4.60.1. Notification If during the course of a project, archaeological materials are identified by the project archaeologist, archaeological monitor, tribal representative, City staff member, the project applicant or his/her representative or employee, all construction activities that may disrupt those materials shall cease. The Director shall be notified immediately of the discovery of archaeological materials. Refer to Section 4.40.3.3 on Discovery of Human Remains (City of San Luis Obispo 2009). Page 168 of 560 City of San Luis Obispo Mill Street Sewer Replacement Project 4 Section 4.60.2. Field Study Under most circumstances, the project applicant will be directed to retain a qualified professional archaeologist to immediately visit the site, evaluate the materials recovered and provide a written report to the Director recommending the appropriate course of action (City of San Luis Obispo 2009). Section 4.60.3. Mitigation If significant archaeological resources are present, the archaeologist shall propose specific mitigation measures in writing. The Director may approve, approve with changes or reject the mitigation proposal. The project applicant shall implement the proposal, to the satisfaction of the Director. A copy of the archaeologist's recommendations and the Director's decision will be forwarded to the Cultural Heritage Committee (CHC) (City of San Luis Obispo 2009). Cultural Resource Sensitivity The project site is located in the historic downtown area of the City, partially within the boundaries of the Downtown, Chinatown, and Mill Street Historic Districts, less than 150 meters (490 feet) from the Mission San Luis Obispo de Tolosa, and in between Old Garden/Brizzolara creek and San Luis Obispo creek. The presence of the creeks, previously recorded archaeological resources (see below), and the proximity of historical buildings increases the likelihood of encountering archaeological deposits within the project site. Given the project is within areas determined to be sensitive for archaeological resources, archaeological monitoring during construction will be required in accordance with Cultural Resources Mitigation Measure 2 of the 2007 IS-MND (City of San Luis Obispo 2007). Cultural Resources Records Search The CHRIS CCIC completed an in-house records search of the project site and a 1/8-mile radius surrounding it on June 28, 2024. The primary purpose of the records search was to identify previously recorded archaeological and built environment resources known to exist within or near the project site. The CHRIS CCIC records search also revealed the nature and extent of cultural resources studies previously conducted within the project site and its vicinity. The CHRIS CCIC records search identified 139 previously recorded cultural resources consisting of two prehistoric archaeological sites, two multicomponent archaeological sites, five historic-period archaeological sites, and 130 historic-period built environment resources within the 1/8-mile radius. Based on the site boundaries depicted on the CHRIS CCIC records search maps, two of these 139 previously recorded resources (CA-SLO-30 and CA-SLO-1424) are located within the project site and are described further below. The CHRIS CCIC records search also revealed that 68 previously conducted cultural resources studies within the 1/8-mile radius of the project site. Seven of these studies (SL-02651, SL-03934, SL-05033, SL-05333, SL-05797, SL-06082, and SL-07078) include portions of the project site. However, none of these studies identified any cultural resources within the project site. CA-SLO-30 Resource CA-SLO-30 was originally recorded on June 7, 1948, by A.R Pilling as four burials and shell/Pismo Clam exposed during excavations for the “new Pacific Telephone building.” According to Page 169 of 560 City of San Luis Obispo Mill Street Sewer Replacement Project Cultural Resources Monitoring Plan 5 this recording, the remains were moved to the Sheriff’s office. It is also mentioned that the bodies may be associated with the Mission San Luis Obispo de Tolosa. Resource CA-SLO-30 is believed to have been completely destroyed by the construction activities. Even though the resource boundary provided by the CHRIS CCIC depicts CA-SLO-30 within the project site, due to the poor quality maps included with CA-SLO-30 site record, it is unknown if this resource was actually located within the project site, or adjacent to it. CA-SLO-1424 Resource CA-SLO-1424 was originally recorded on May 17, 1973, by Jay Von Werlhof as an occupational site containing extensive midden, large deposits of Pismo Clam and whole abalone shells, metates, rubbing stones, a mortar, game ball, mano, and an anvil. Resource CA-SLO-1424 is believed to have been completely destroyed by “construction and cultivation.” Even though the resource boundary provided by the CHRIS CCIC depicts CA-SLO-30 within the project site, due to the poor quality maps associated with CA-SLO-1424, it is unknown if this resource was actually located within the project site, or adjacent to it. Vibration Assessment Due to the narrow ROWs in which the project is located, and because most of the project is located at least partially within the boundaries of the Downtown, Chinatown, and Mill Street Historic Districts, a vibration assessment (Pritchard and Carman 2024) was conducted to assist the City in protecting the historic-period buildings located immediately adjacent to the project. The City has not adopted quantitative thresholds to assess vibration impacts during construction or operational activities. Therefore, the vibration impact assessment criteria outlined in the Federal Transit Administration’s (FTA’s) Transit Noise and Vibration Impact Assessment Manual (FTA 2018) were used to evaluate potential construction vibration impacts to nearby sensitive historical receptors in the vicinity of the project site. Historic-period structures are considered vibration-sensitive receptors due to their increased sensitivity to vibration, which may cause damage and degradation. Therefore, the vibration- sensitive receptors for the project include various historic-period structures along the project route within the boundaries of the Downtown, Chinatown, and Mill Street Historic Districts, which may be subjected to excessive vibration impacts during construction. Based on the project plans, these structures are located as close as 14 feet to the proposed construction work area. The vibration assessment found that vibration impacts would be considered significant if vibration levels at surrounding historical structures were to exceed 0.12 inches per second (in/sec) peak particle velocity (PPV), which is the limit where vibration levels may cause damage to fragile or historic buildings. To present a conservative analysis of potential impacts, all buildings in the vicinity of the project site were considered potentially historic and vibration-sensitive receptors, especially those within the boundaries of the Downtown, Chinatown, and Mill Street Historic Districts, and were evaluated to the 0.12 in/sec PPV threshold. During construction, the following equipment would be used: excavator, backhoe, jumping jacks, roller, dump trailer, and a jackhammer. Rollers (assumed to be vibratory rollers) and large earthmoving equipment (such as an excavator and backhoe) would produce the highest vibration levels. These types of equipment typically produce PPV between 0.089 and 0.21 in/sec vibrations at a reference distance of 25 feet. The use of this equipment during construction for the project would be used as close as approximately 14 feet to nearby buildings along the project route. At this distance, vibratory rollers would generate a vibration level of approximately 0.560 in/sec PPV, while Page 170 of 560 City of San Luis Obispo Mill Street Sewer Replacement Project 6 large earthmoving equipment would generate a vibration level of 0.237 in/sec PPV. At these closest distances, both equipment types could produce levels of vibration at nearby sensitive structures that exceed the FTA’s thresholds. In order to reduce project-generated vibration during construction, the following measures should be implemented by the construction contractor: ▪ Construction activities involving the use of a vibratory roller within 37 feet of a nearby historic building/structure shall be conducted using a static/pneumatic roller in lieu of the vibratory roller. ▪ Construction activities involving the use of earthmoving equipment (excavator, backhoe, etc.) within 21 feet of a nearby historic building/structure shall be conducted with offroad equipment limited to 100 horsepower (hp) or less. Implementation of the above measures would reduce vibration produced by rollers and earthmoving equipment to levels below the FTA’s limit of 0.12 in/sec PPV threshold for potential architectural damage to historic buildings/structures. Use of a static/pneumatic roller would reduce vibration levels to 0.119 in/sec PPV at a distance of 14 feet (the minimum distance from the project to vibration-sensitive receptors). Similarly, use of small offroad equipment rated at 100 hp or less would reduce vibration levels to 0.007 in/sec PPV at a distance of 14 feet. Therefore, vibration impacts to sensitive buildings/structures in the vicinity of the project site would be below the limits established by the FTA for potential architectural damage to fragile and historic buildings/structures. Page 171 of 560 City of San Luis Obispo Mill Street Sewer Replacement Project Cultural Resources Monitoring Plan 7 2 Monitoring Procedures Archaeological Construction Monitoring Requirements In accordance with Cultural Resources Mitigation Measure 2 of the 2007 IS-MND, archaeological monitoring is required for all project-related ground disturbance in designated archaeological sensitive areas (City of San Luis Obispo 2007). Archaeological monitoring shall be conducted under the direction of a qualified professional archaeologist who meets the Secretary of the Interior’s Professional Qualifications Standards for prehistoric and historic archaeology (National Park Service [NPS] 1983; hereafter, Qualified Archaeologist). The archaeological monitoring will be conducted under the direction of Rincon Principal Investigator Ken Victorino, MA, RPA, and Principal in Charge Christopher Duran, MA, RPA. Both Mr. Victorino and Mr. Duran exceed the meet the Secretary of the Interior’s Professional Qualifications Standards for prehistoric and historic archaeology. The monitoring methods provided in this plan are designed to comply with Cultural Resources Mitigation Measure 2 of the 2007 IS-MND and the City’s ARPPG-4.60-1, 4.60-2, and 4.60-3 (City of San Luis Obispo 2007, 2009). Archeological Monitoring Duties An archaeological monitor shall be onsite during project-related earthmoving activities. Earthmoving activities include, but are not limited to, vegetation removal, asphalt/concrete removal that extends into underlying soils, grading, boring, excavation, trenching, and all other excavation activities. The archaeological monitor does not need to be present during the utility pipe installation or backfilling. During monitoring, the monitor(s) shall examine the work areas for the presence of prehistoric artifacts (e.g., chipped stone tools and production debris, stone milling tools), historic- period debris (e.g., metal, glass, housewares, ceramics, construction materials), and/or soil discoloration that might indicate an archaeological deposit or feature. Daily Archaeological Monitoring Log The archaeological monitor shall maintain a daily log documenting ground disturbing activity, work locations, soils descriptions, depths of ground disturbances, description and provenience of any archaeological discoveries (if any), and any necessary action items for monitoring. The monitoring forms shall be submitted to the City as an attachment to an archaeological construction monitoring report that will be prepared and submitted to the City subsequent to completion of all project- related earthmoving activities. Archaeological Construction Monitoring Report An Archaeological Construction Monitoring Report (ACMR) that outlines the methods and results of the archaeological construction monitoring effort will be prepared under the direction of the Qualified Archaeologist. The report will include maps, photographs and will include the daily monitoring logs completed by the construction archaeological monitor consistent with the ARPPG (City of San Luis Obispo 2009). Page 172 of 560 City of San Luis Obispo Mill Street Sewer Replacement Project 8 Unanticipated Discovery of Cultural Resources In the event of an unanticipated discovery of cultural resources (prehistoric or historic), the archaeological monitor retains the authority to temporarily halt and redirect work until the resource(s) have been evaluated and the area cleared for construction activities to recommence. The discovery will be secured with a Construction Exclusion Zone (CEZ) consistent with Section 4.40.3.2 of the ARPPG, and the City staff will be contacted consistent with Section 4.60.1 of the ARPPG. If the archaeological resource is prehistoric in nature, a local Native American group will be contacted by the City and given the opportunity to consult with the City regarding the find and provide recommendations. A Native American monitor will be retained by the Applicant for the remainder of earth disturbing activities should a prehistoric resource be found during construction (City of San Luis Obispo 2009). Recovery protocols in the case of a find are discussed in greater detail in Section 3 below. Duration of Archaeological Monitoring Monitoring shall continue during all ground disturbing activities in the designated archaeological sensitive areas, as described above, in accordance with Cultural Resources Mitigation Measure 2 of the 2007 IS-MND (City of San Luis Obispo 2007). If the Qualified Archaeologist, in coordination with the City (and Native American monitor if present), determines that ground-disturbing activities have extended outside of the designated archaeological sensitive areas, as described above, the monitoring may be reduced or eliminated. The Qualified Archaeologist will provide a written recommendation (via email or other method acceptable to the City) to reduce or eliminate the monitoring effort. Should the City accept the recommendation, the reduction or elimination will commence immediately upon approval. Vibration Measures In order to reduce project-generated vibration that has the potential to impact to historic-period buildings/structures adjacent to the project site during construction, the following measures should be implemented by the construction contractor: ▪ Construction activities involving the use of a vibratory roller within 37 feet of a nearby historic building/structure shall be conducted using a static/pneumatic roller in lieu of the vibratory roller. ▪ Construction activities involving the use of earthmoving equipment (excavator, backhoe, etc.) within 21 feet of a nearby historic building/structure shall be conducted with offroad equipment limited to 100 horsepower (hp) or less. Page 173 of 560 City of San Luis Obispo Mill Street Sewer Replacement Project Cultural Resources Monitoring Plan 9 3 Archaeological Resources Discovery Plan The following outlines the procedures to be followed in the event of an inadvertent discovery of cultural resources, including human remains. Discovery of Archaeological Resources In accordance with Cultural Resources Mitigation Measure 2 of the 2007 IS-MND and the ARPPG, the procedure for appropriately evaluating unanticipated cultural resources encountered during construction will include, but not be limited to, the following: • For the discovery of previously unknown archaeological resources (prehistoric or historic): The archaeological monitor will divert construction activity in the immediate vicinity of the find by signaling to construction staff and notifying the designated construction foreman. The archaeological monitor will report the discovery to the Qualified Archaeologist and the City’s construction inspector. The “immediate vicinity” will vary depending upon the nature of the discovery. A typical buffer for a new discovery is 50-100 feet, but will depend on the nature of the resource. If the archaeological resource is prehistoric in nature, a local Native American group will be contacted by the City to consult about the find, and a Native American monitor will be retained by the Applicant for the remainder of earth disturbing activities (City of San Luis Obispo 2009). • Upon completion of the above notification, the archaeological monitor will determine the nature and extent of the archaeological remains and make a preliminary assessment of their integrity and potential importance. If the archaeological monitor determines that the discovery is not cultural, or is an isolated artifact (i.e., found by itself, not in association with any other cultural materials), the monitor will immediately notify the Qualified Archaeologist, the City, and construction superintendent that activities may resume as soon as the archaeological item(s) has been properly photographed and recorded (City of San Luis Obispo 2009). • If potentially significant cultural features, artifact concentrations, or intact deposits are discovered, the archaeological monitor will divert construction activities away from the find and report the discovery to the Qualified Archaeologist, the City, and the construction superintendent, so that appropriate notifications to the City can be issued (City of San Luis Obispo 2009). • A temporary CEZ, consisting of lath and flagging tape (or other appropriate materials), will be set up around the discovery. A radius of 50 feet may be established so that the resource may be evaluated. However, the size and shape of the CEZ may be reduced or expanded as the significance and extent of the find is determined and treatment measures are implemented, and for safety (City of San Luis Obispo 2009). • A minimum 50-foot radius shall also be established for any suspected human remains (see Section 3.2 for further direction related to the discovery of human remains). Isolated artifacts shall be marked by an orange cone or flagging with no additional radius. The CEZ will not be removed until the potentially significant cultural resource has been evaluated to assess Page 174 of 560 City of San Luis Obispo Mill Street Sewer Replacement Project 10 whether it is considered a “historical resource,” pursuant to the California Environmental Quality Act (CCR, § 15064.5[a]). To minimize construction delays, if a potentially significant cultural resource is discovered during monitoring, the Qualified Archaeologist will immediately contact the City to formulate a plan for further treatment. If necessary, the evaluation may require archaeological testing for California Register of Historical Resources (CRHR) eligibility. If the discovery proves to be eligible for the CRHR and cannot be avoided by the project or redesign of the project, additional work, such as data recovery excavation, may be warranted to mitigate any significant impacts to historical resources (City of San Luis Obispo 2009). • Archaeological resources (prehistoric or historic) identified within the project site shall be recorded according to current archaeological standards (California Office of Historic Preservation 1990) and in compliance with City Guidelines (City of San Luis Obispo 2009). This shall include the preparation of California Department of Parks and Recreation (DPR) Series 523 forms. • Pertinent information concerning the resource(s) shall be recorded, including the site type, components, size, and provenience. Upon completion, the DPR forms shall be submitted to the CHRIS CCIC for primary number and trinomial designation. Final copies of the DPR forms shall be included in the final ACMR that shall be prepared as presented in Section 4.1 below. If the report discusses archaeological resources, it will be considered confidential (City of San Luis Obispo 2009). Discovery of Human Remains There is a possibility that the project’s construction-related activities may encounter human remains. Therefore, in accordance with Cultural Resources Mitigation Measure 2 of the 2007 IS- MND and Section 4.40.3.3 of the ARPPG, and in compliance with existing regulations, if potential human bone or remains are discovered, ground-disturbing activities in the area of the discovery shall immediately be halted and redirected while a temporary CEZ surrounding the site of discovery is established to allow for further examination and treatment of the find (City of San Luis Obispo 2007, 2009). The City shall be immediately notified of the discovery of potential human remains. If the remains are positively identified as human, then the San Luis Obispo County Coroner shall be immediately notified by telephone, pursuant to Health and Safety Code 7050.5. By law, the Coroner will determine within 48 hours of being notified if the remains are subject to his or her authority. If the human remains are determined to be prehistoric, the Coroner will notify the Native American Heritage Commission, which will determine and notify a most likely descendant (MLD). The MLD shall complete the inspection of the site within 48 hours of being granted access and provide recommendations for the treatment of any human remains and artifacts associated with Native American burials. Page 175 of 560 City of San Luis Obispo Mill Street Sewer Replacement Project Cultural Resources Monitoring Plan 11 4 Reporting of Monitoring Results and Curation of Finds Reporting of Archaeological Monitoring Results At the conclusion of the monitoring effort, the ACMR will be prepared under the direction of the Qualified Archaeologist. The ACMR will outline the monitoring methods employed, describe the construction activity and duration, and present the results of the monitoring. The level of effort to complete the ACMR is dependent on the number of resources recovered during monitoring activities, if any. Should the monitoring effort be negative for the identification of cultural resources, a negative letter report shall be prepared. The letter report shall include, at a minimum, the dates of monitoring, activities conducted, personnel, and field logs (City of San Luis Obispo 2009). If archaeological materials are identified, a comprehensive technical report will be prepared and describe and interpret findings and data, in accordance with the Archaeological Resources Management Reports (ARMR): Recommended Contents and Format and City Guidelines (California Office of Historic Preservation 1990; City of San Luis Obispo 2009). If required, the ACMR shall include a complete description of resources identified during monitoring, treatment of those resources, CRHR eligibility recommendations, site records, and site maps. If the report discusses archaeological resources, it will be considered confidential (City of San Luis Obispo 2009). The final version of the ACMR shall be submitted to the City and the CHRIS CCIC. Curation of Archaeological Finds Recovered archaeological finds not associated with burials will be temporarily stored by the Qualified Archaeologist at a secured off-site laboratory, until an appropriate on-site reburial location not subject to future ground disturbance or curation at an appropriate repository is agreed upon by the City and’, interested Native American groups, and/or the MLD. If the Qualified Archaeologist, in consultation with the interested Native American representative (if applicable), and the City, is unable to bury newly discovered isolated artifacts within the project boundaries, the Qualified Archaeologist will secure a written agreement with a recognized repository or comparable institution that meets the State of California Guidelines for the Curation of Archaeological Collections (NPS 1993) such as the Repository for Archaeological and Ethnographic Collections at the University of California, Santa Barbara, or San Luis Obispo County Archaeological Society (SLOCAS) Collections regarding the final disposition, permanent storage, and maintenance of any archaeological resources discovered during archaeological monitoring or any necessary archaeological testing and determined not to be ceremonial and/or Tribal artifacts. Permanent treatment of human remains and associated funerary items shall be determined by the City in consultation with the MLD (City of San Luis Obispo 2009). Page 176 of 560 City of San Luis Obispo Mill Street Sewer Replacement Project 12 5 Contacts City of San Luis Obispo Public Works Hai Nguyen, Senior Engineer Phone: 805-781-7108 Email: hnguyen@slocity.org Rincon Cultural Resources Project Manager Matt Gonzalez Phone: 805-705-5513 Email: mgonzalez@rinconconsultants.com Rincon Principal Investigator/Qualified Archaeologist Ken Victorino Phone: 805-644-4455 x3032 Email: kvictorino@rinconconsultants.com Rincon Cultural Resources Principal in Charge/Qualified Archaeologist Christopher Duran Phone: (805) 947-4838 x22 Email: cduran@rinconconsultants.com San Luis Obispo County Coroner Ian Parkinson - Sheriff-Coroner Phone: (805) 781-4513 Page 177 of 560 City of San Luis Obispo Mill Street Sewer Replacement Project Cultural Resources Monitoring Plan 13 6 References California Office of Historic Preservation 1990 Archaeological Resource Management Reports (ARMR) Recommended Contents and Format. https://ohp.parks.ca.gov/pages/1069/files/armr-remediated.pdf , accessed July 2024. City of San Luis Obispo 2007 Initial Study Environmental Checklist Form for ER 10-07 – Utility Trenching in Public Streets within Archaeologically Sensitive Areas, City of San Luis Obispo, 2007. 2009 Archaeological Resource Preservation Program Guidelines. https://www.slocity.org/home/showpublisheddocument/4140/635497649652000000, accessed July 2024. Federal Transit Administration (FTA). 2018 Transit Noise and Vibration Impact Assessment. November. Available at: https://www.transit.dot.gov/sites/fta.dot.gov/files/docs/research- innovation/118131/transit-noise-and-vibration-impact-assessment-manual-fta-report- no-0123_0.pdf National Park Service 1983 Archaeology and Historic Preservation: Secretary of the Interior’s Standards and Guidelines. Washington, DC. https://www.nps.gov/history/local-law/arch_stnds_0.htm, accessed July 2024. 1993 State of California Guidelines for the Curation of Archaeological Collections. https://ohp.parks.ca.gov/pages/1069/files/guide-93.pdf, accessed July 2024. Pritchard, Kyle and Josh Carman 2024 Vibration Assessment for the Mill Street Sewer Replacement Project, City of San Luis Obispo, California. July 22, 2024. Page 178 of 560 City of San Luis Obispo Mill Street Sewer Replacement Project 14 This page intentionally left blank. Page 179 of 560 Appendix A Figures Page 180 of 560 City of San Luis Obispo Mill Street Sewer Replacement Project 1-0 Figure 1 Regional Location Map Page 181 of 560 Figure 2 Aerial Map Page 182 of 560 Rincon Consultants, Inc. 180 North Ashwood Avenue Ventura, California 93003 805-644-4455 www.rinconcons ultan ts.com July 22, 2024 Project No: 24-16377 Hai Nguyen, PE Senior Engineer City of San Luis Obispo, Public Works 919 Palm Street San Luis Obispo, California 93401-3218 Via email: hnguyen@slocity.org Subject: Vibration Assessment for the Mill Street Sewer Replacement Project City of San Luis Obispo, California Dear Hai Nguyen: Rincon Consultants, Inc. (Rincon) is pleased to provide this vibration assessment for the Mill Street Sewer Replacement Project (“project”) located in the City of San Luis Obispo, California. This analysis evaluates the potential for construction activities to generate levels of vibration which may cause damage to historic structures near the project site and provides recommendations to reduce potential construction vibration impacts. Project Site and Existing Conditions The project site is located in downtown San Luis Obispo, between the Old Garden/Brizzolara and San Luis Obispo Creeks, partially within the Downtown, Chinatown, and Mill Street Historic District boundaries. Figure 1 shows the project location in the context of an aerial view of the surrounding area. Project Description The project would involve the installation of approximately 0.75-miles of sewer lines in downtown San Luis Obispo. The sewer line would be installed within the rights-of-way (ROW) of Morro Street, Mill Street, Toro Street, and Santa Rosa Street, requiring excavation depths ranging between five and ten feet. Per information provided by the City, all work is expected to occur within the extents of the roadways and would not encroach upon the sidewalks. Page 183 of 560 2 Figure 1 Project Location Page 184 of 560 3 Overview of Vibration Groundborne vibration of concern in environmental analysis consists of the oscillatory waves that move from a source through the ground to adjacent structures. The number of cycles per second of oscillation makes up the vibration frequency, described in terms of hertz (Hz). The frequency of a vibrating object describes how rapidly it oscillates. The normal frequency range of most groundborne vibration that can be felt by the human body ranges between less than 1 Hz to 200 Hz (Crocker 2007). While people have varying sensitivities to vibrations at different frequencies, in general they are most sensitive to low-frequency vibration. Vibration in buildings, such as that from nearby construction activities, may cause windows, items on shelves, and pictures on walls to rattle. Vibration of building components can also take the form of an audible low-frequency rumbling noise, referred to as groundborne noise. Groundborne noise is usually only a problem when the originating vibration spectrum is dominated by frequencies in the upper end of the range (60 to 200 Hz), or when foundations or utilities, such as sewer and water pipes, physically connect the structure and the vibration source (Federal Transit Administration [FTA] 2018). Although groundborne vibration is sometimes noticeable in outdoor environments, it is almost never annoying to people who are outdoors. The primary concern of vibration is that it can be intrusive and annoying to building occupants and vibration-sensitive land uses. In cases of fragile or historic structures which are more sensitive to vibration, excessive vibration may cause physical damage. Vibration energy spreads out as it travels through the ground, causing the vibration level to diminish with distance away from the source. High-frequency vibrations diminish much more rapidly than low frequencies, so low frequencies tend to dominate the spectrum at large distances from the source. Discontinuities in the soil strata can also cause diffractions or channeling effects that affect the propagation of vibration over long distances (Caltrans 2020). When a building is impacted by vibration, a ground-to-foundation coupling loss will usually reduce the overall vibration level. However, under rare circumstances, the ground-to-foundation coupling may actually amplify the vibration level due to structural resonances of the floors and walls. Vibration amplitudes are usually expressed in peak particle velocity (PPV), or root mean squared (RMS) vibration velocity. The PPV and RMS velocity are normally described in inches per second (in/sec). PPV is defined as the maximum instantaneous positive or negative peak of a vibration signal. PPV is often used in monitoring of blasting vibration because it is related to the stresses that are experienced by buildings (Caltrans 2020). Sensitive Receptors Vibration-sensitive receptors typically include uses where vibration would be considered disruptive to the intended use, such as residences, schools, churches, and hospitals. Vibration-sensitive receptors may also include buildings with vibration-sensitive equipment (e.g., medical facilities with sensitive laboratory equipment, recording studios) which may be affected or damaged by excessive levels of vibration. In addition, fragile or historic-era structures are considered vibration-sensitive receptors due to their increased sensitivity to vibration, which may cause damage and degradation. The project is located within downtown San Luis Obispo, partially within the Downtown, Chinatown, and Mill Street Historic District boundaries, and within an area designated as archaeologically sensitive. Therefore, vibration-sensitive receptors include various historic structures along the project route which may be subjected to excessive vibration impacts during construction. Based on the site plan, these structures are located as close as 14 feet of the proposed construction work area. Page 185 of 560 4 Regulatory Setting and Significance Thresholds The City has not adopted quantitative thresholds to assess vibration impacts during construction or operational activities. Therefore, the vibration impact assessment criteria outlined in the FTA’s Transit Noise and Vibration Impact Assessment Manual (FTA 2018) were used to evaluate potential construction vibration impacts to nearby sensitive historical receptors in the vicinity of the project site. These criteria are shown in Table 1. Table 1 FTA Criteria for Vibration Damage Potential Building Category PPV (in/sec) I. Reinforced concrete, steel, or timber (no plaster) 0.5 II. Engineered concrete and masonry (no plaster) 0.3 III. Nonengineered timber and masonry buildings 0.2 IV. Buildings extremely susceptible to vibration damage 0.12 in/sec = inches per second; PPV = peak particle velocity Source: FTA 2018 As shown in Table 1, vibration impacts would be considered significant if vibration levels at surrounding historical structures were to exceed 0.12 in/sec PPV, which is the limit where vibration levels may cause damage to fragile or historic buildings. To present a conservative analysis of potential impacts, all buildings in the vicinity of the project site are considered potentially historic, especially those within the Downtown, Chinatown, and Mill Street Historic District boundaries, and were evaluated to the 0.12 in/sec PPV threshold. Impact Analysis Methodology Vibration impacts associated with the project were determined based on the construction equipment list specified by the City and typical vibration levels for construction equipment reported by the FTA in the Transit Noise and Vibration Impact Assessment Manual (FTA 2018). During construction, the following equipment would be used: excavator, backhoe, jumping jacks, roller, dump trailer, and a jackhammer. Of this equipment list, a roller (assumed to be a vibratory roller) and large earthmoving equipment (such as an excavator and backhoe) would produce the highest vibration levels. Typical vibration levels produced by these equipment types at a reference distance of 25 feet are shown in Table 2. Table 2 Typical Vibration Levels Produced by Construction Equipment Equipment PPV at 25 ft. (in/sec) Vibratory Roller 0.21 Large Earthmoving Equipment (Excavator, Backhoe) 0.089 PPV = peak particle velocity, in/sec = inches per second Source: FTA 2018 Vibration Impacts As described above, the primary sources of vibration during construction of the project would include vibratory rollers and large earthmoving equipment, which would be used as close as approximately 14 Page 186 of 560 5 feet of nearby buildings along the project route. At this distance, vibratory rollers would generate a vibration level of approximately 0.560 in/sec PPV, while large earthmoving equipment would generate a vibration level of 0.237 in/sec PPV. At these closest distances, both equipment types could produce levels of vibration at nearby sensitive structures that exceed the FTA’s thresholds. Vibration reduction measures are recommended below to reduce construction vibration levels below the FTA vibration criteria. Vibration Reduction Measures In order to reduce project-generated vibration during construction, the following measures shall be implemented by the construction contractor: • Construction activities involving the use of a roller within 37 feet of a nearby historic building/structure shall be conducted using a static/pneumatic roller in lieu of a vibratory roller. • Construction activities involving the use of earthmoving equipment (excavator, backhoe, etc.) within 21 feet of a nearby historic building/structure shall be conducted with offroad equipment limited to 100 horsepower (hp) or less. Implementation of the above mitigation measures would reduce vibration produced by rollers and earthmoving equipment to levels below the FTA’s limit of 0.12 in/sec PPV for potential architectural damage to historic buildings/structures. Use of a static/pneumatic roller would reduce vibration levels to 0.119 in/sec PPV at 14 feet away. Similarly, use of small offroad equipment rated at 100 hp or less would reduce vibration levels to 0.007 in/sec PPV at 14 feet away. Therefore, vibration impacts to sensitive buildings/structures in the vicinity of the project site would be below the limits established by the FTA for potential architectural damage to fragile and historic buildings/structures. Conclusion Vibration generated during construction of the project would not exceed applicable vibration limits as long as the Vibration Reduction Measures are implemented: all construction activities utilizing a roller within 37 feet of a nearby historic building/structure shall be conducted using a static/pneumatic roller (in lieu of a vibratory roller) and all construction activities utilizing earthmoving equipment (excavator, backhoe, etc.) within 21 feet of a nearby historic building/structure shall be conducted using offroad equipment limited to 100 hp or less. Incorporation of these Vibration Reduction Measures would reduce vibration produced during construction to levels below the FTA’s limits for architectural damage to fragile and historic buildings/structures. Sincerely, Rincon Consultants, Inc. Kyle Pritchard Josh Carman, INCE Noise Specialist Director of Technical Services Page 187 of 560 6 References California Department of Transportation (Caltrans). 2020. Transportation and Construction Vibration Guidance Manual. Available at: https://dot.ca.gov/-/media/dot- media/programs/environmental-analysis/documents/env/tcvgm-apr2020-a11y.pdf Crocker, Malcom J. (Editor). 2007. Handbook of Noise and Vibration Control Book, ISBN: 978-0-471- 39599-7, Wiley-VCH. October. Federal Transit Administration (FTA). 2018. Transit Noise and Vibration Impact Assessment. November. Available at: https://www.transit.dot.gov/sites/fta.dot.gov/files/docs/research- innovation/118131/transit-noise-and-vibration-impact-assessment-manual-fta-report-no- 0123_0.pdf Page 188 of 560 APPENDIX APPENDIX 4 APPENDIX C – GEOTECHNICAL REPORTS Page 189 of 560 SUBSURFACE DATA REPORT CITY OF SAN LUIS OBISPO 2024 SEWER UPGRADES MILL STREET, ISLAY STREET, SIERRA WAY SAN LUIS OBISPO, CALIFORNIA April 5, 2024 Prepared for Ms. Hai Nguyen City of San Luis Obispo Prepared by Earth Systems Pacific 4378 Old Santa Fe Road San Luis Obispo, CA 93401 Copyright © 2024 Page 190 of 560 April 5, 2024 FILE NO.: 306551-001 Mr. Hai Nguyen City of San Luis Obispo 919 Palm Street San Luis Obispo, CA 93401 PROJECT: CITY OF SAN LUIS OBISPO, 2024 SEWER UPGRADES MILL STREET, ISLAY STREET, AND SIERRA WAY SAN LUIS OBISPO, CALIFORNIA SUBJECT: Geotechnical Engineering Report CONTRACT REF: Earth Systems Pacific Proposal for Subsurface Exploration and Data Report, City of San Luis Obispo 2024 Sewer Replacement Projects, Mill Street, Islay Street, and Sierra Way, San Luis Obispo, California, dated February 8, 2024, Doc. No. SLO-2402-024.PRP Dear Mr. Nguyen: As per your authorization of the referenced proposal, this subsurface data report has been prepared for use in the development of plans and specifications for the proposed City of San Luis Obispo, 2024 Sewer Upgrades project in San Luis Obispo, California. Subsurface characterization and recommendations for trench backfill and observation and testing are presented herein. One bound copy and an electronic copy of this report are furnished for your use. We appreciate the opportunity to have provided services for this project and look forward to working with you again in the future. If there are any questions concerning this report, please do not hesitate to contact the undersigned. Sincerely, Earth Systems Pacific Robert Down, PE Samuel Venable, PE Principal Engineer Staff Engineer Doc. No.: 2403-051.SER/cr Page 191 of 560 iii Table of Contents COVER LETTER ................................................................................................................ ii 1.0 INTRODUCTION AND SITE SETTING .............................................................................. 1 2.0 SCOPE OF SERVICES ...................................................................................................... 1 3.0 FIELD INVESTIGATION ................................................................................................... 2 4.0 GENERAL SUBSURFACE ................................................................................................. 3 5.0 CONCLUSIONS ............................................................................................................... 4 6.0 GEOTECHNICAL RECOMMENDATIONS ......................................................................... 4 Trench Backfill ............................................................................................................... 5 Observation and Testing ............................................................................................... 5 7.0 CLOSURE........................................................................................................................ 7 TECHNICAL REFERENCES ........................................................................................................... 8 APPENDICES APPENDIX A Figure 1 - Site Vicinity Map Figure 2 - Exploration Location Maps Boring Log Legend Boring Logs APPENDIX B Laboratory Test Results Page 192 of 560 City of San Luis Obispo, 2024 Sewer Upgrades April 5, 2024 San Luis Obispo, California 306551-001 1 2403-051.SER 1.0 INTRODUCTION AND SITE SETTING The proposed project will consist of the construction of a new sewer line to be installed on Morro Steet, Mill Street, Toro Street, Santa Rosa Street, Islay Street, Chorro Street, Leff Street, Henry Street, George Street, Ella Street, Sierra Way, and Bishop Street in San Luis Obispo, California (see Figure 1 – Site Vicinity Map in Appendix A). Based on our discussions, we understand that the installation of the new sewer line will be by open trench installation. 2.0 SCOPE OF SERVICES The authorized scope of work included a general site reconnaissance, field exploration, geotechnical analysis of the data gathered, and preparation of this report. The analysis and subsequent recommendations were based on verbal information and a general project location plan provided by the client. This report and recommendations are intended to comply with the considerations of Sections 1803.1 through 1803.6, J104.3 and J104.4, as applicable, of the 2022 California Building Code (CBC) and common geotechnical engineering practice in this area under similar conditions at this time. The test procedures were accomplished in general conformance with the standards noted, as modified by common geotechnical engineering practice in this area under similar conditions at this time. Preliminary geotechnical engineering recommendations for trench backfill and observation and testing are presented to guide the development of project plans and specifications. As there may be geotechnical issues yet to be resolved, the geotechnical engineer should be retained to provide consultation as the design progresses. It may also be advantageous to retain the geotechnical engineer to review project plans as they near completion to assist in verifying that pertinent geotechnical issues have been addressed and to aid in conformance with the intent of this report. It is our intent that this report be used exclusively by the client to form the geotechnical basis of the design of the project and in the preparation of plans and specifications. Application beyond this intent is strictly at the user’s risk. This report does not address issues in the domain of contractors such as, but not limited to, site safety, loss of volume due to stripping of the site, shrinkage of soils during compaction, excavatability, dewatering, temporary slope angles, construction means and methods, etc. Analyses of aerial or site geology, or of the soil for corrosivity, radioisotopes, asbestos (either Page 193 of 560 City of San Luis Obispo, 2024 Sewer Upgrades April 5, 2024 San Luis Obispo, California 306551-001 2 2403-051.SER naturally occurring or in man-made products), lead or mold potential, hydrocarbons, or chemical properties is beyond the scope of this report. Any ancillary features such as flag or light poles, temporary access roads, non-structural fills, pipeline design, and retaining walls are not within our scope and are also not addressed. Design and/or suitability of LID features such as retention basins, bio swales, or other improvements are also beyond our scope. In the event that there are any changes in the nature, design, or location of improvements, or if any assumptions used in the preparation of this report prove to be incorrect, the conclusions and recommendations contained in this report shall not be considered valid unless the changes are reviewed and the conclusions of this report modified or verified by the geotechnical engineer in writing. The criteria presented in this report are considered preliminary until such time as any peer review or review by any jurisdiction has been completed, conditions have been observed by the geotechnical engineer in the field during construction, and the recommendations have been verified as appropriate, or modified by the geotechnical engineer in writing. 3.0 FIELD INVESTIGATION Fourteen exploratory borings were drilled at the site on February 28, 2024 through March 1, 2024 to depths of 10.0 feet and 16.0 feet below the ground surface (bgs). The borings were drilled with a truck-mounted Gtech GT8 drill rig equipped with a 6-inch outside diameter hollow stem auger and an automatic hammer for sampling. As the borings were advanced, soil samples were obtained using a 3-inch outside diameter lined barrel sampled (ASTM D 3550-17 with shoe similar to ASTM D 2937-17) and a standard penetrometer (ASTM D 1586). Bulk samples were also obtained from the auger cuttings. The approximate locations of the borings are shown on Figure 2 – Exploration Location Map in Appendix A. Soils encountered in the borings were categorized and logged in general accordance with the Unified Soil Classification System and ASTM D 2488-17. Logs of the borings are presented in Appendix A, along with a Boring Log Legend. In reviewing the boring logs and legend, the reader should recognize that the legend is intended as a guideline only, and there are a number of conditions that may influence the characteristics observed during drilling. These include, but are not limited to, the presence of cobbles or boulders, cementation, variations in soil moisture, presence of groundwater, and other factors. Consequently, the logger must exercise judgment in interpreting soil and bedrock characteristics, possibly resulting in soil descriptions that vary from the legend. It should be noted that the descriptions of bedrock must span a much wider range of density and strength characteristics than soil and are relative to other bedrock strata. Page 194 of 560 City of San Luis Obispo, 2024 Sewer Upgrades April 5, 2024 San Luis Obispo, California 306551-001 3 2403-051.SER For example, fractured and weathered bedrock may be described as “soft”, yet will be considerably harder than almost any type of soil. Conversely, a clay soil may be described as “hard”, however it will not be nearly as hard as “soft” bedrock. Selected samples were tested in our laboratory to determine the bulk density (ASTM D 2937-17, as modified for ring liners), moisture content (ASTM D 2216-10), maximum density and optimum moisture content (ASTM D 1557-12, modified), and grain size distribution (sieve per ASTM D 422- 63/07; D1140-17). The laboratory test results are presented in Appendix B. 4.0 GENERAL SUBSURFACE Throughout the exploration, the subsurface profiles varied by location. In Borings 1, 2, 6, and 9- 14, the subsurface profile consisted of alluvium overlying bedrock of the Franciscan Mélange Formation, which was encountered at depths ranging from 2.5 feet to 5.5 feet bgs with the exception of Boring 7 in which bedrock was encountered at 10 feet bgs. In Borings 3-5, 7, and 8, the profiles consisted of alluvium to the depth explored of 10 feet bgs. Residual soils were encountered in Borings 3 and 6 at a depth of 7.5 feet bgs. Alluvial soils consisted of sandy lean clay, sandy lean clay with gravel, lean clay, clayey gravel with sand, and poorly graded sand with gravel. The clay had a medium stiff to very stiff consistency, and the sand and gravel were medium dense to very dense . Residual soils consisted of medium dense clayey sand and soft sandy lean clay. Residual and alluvial soils were logged as moist to very moist. The Franciscan Mélange Formation bedrock was predominantly sandstone , although metavolcanic rock was encountered in Boring 6. Bedrock hardness varied from very soft to moderately hard, and the rock was moderately weathered or highly weathered. Subsurface groundwater was only encountered in Boring 14 at 3 feet bgs. Pavement sections of the existing roadways varied by location. Thickness of the asphaltic concrete ranged from 2 inches to 9.5 inches, and aggregate base material ranged from 2 inches to 10 inches. Fabric was periodically encountered in the sections. On Mill Street in Boring 5, a 5- inch thick concrete section was found to underly the asphaltic concrete. Please refer to the boring logs in Appendix A for a more complete description of the subsurface conditions encountered at the site. Page 195 of 560 City of San Luis Obispo, 2024 Sewer Upgrades April 5, 2024 San Luis Obispo, California 306551-001 4 2403-051.SER 5.0 CONCLUSIONS In our opinion, the site is suitable, from a geotechnical engineering standpoint, for the proposed project, provided the recommendations contained herein are implemented in the design and construction. The new sewer line is planned to be installed using open trench methods. From a geotechnical standpoint, the primary concern at the site is the potential for variable soil and bedrock conditions to impact the excavations. Based on the subsurface data, stiff sandy lean clay will be the predominant soil type encountered during excavation to overly the bedrock, although medium dense sands or soft clays may also be encountered , such as the residual soils encountered below Santa Rosa Street and Chorro Street, respectively . Gravels and cobbles may also be encountered such as the gravel found below Santa Rosa Street, Mill Street, and Chorro Street in Borings 3, 5, and 6, respectively. Bedrock hardness will vary considerably. For example during the subsurface exploration, very soft sandstone was encountered underlying Bishop Street while moderately hard sandstone was encountered below Sierra Way . For the purposes of preliminary planning and estimating of shoring or temporary excavation slopes, the alluvial and residual soils should be considered to be Type C soil, as defined by the California Division of Occupational Safety and Health (CALOSHA). Bedrock will also be encountered during excavation. Due to the variable conditions of hardness and weathering, rock materials should be considered to be Type B or C soil, as defined by CALOSHA, depending upon the jointing, fracturing, and dip. The contractor is responsible for all aspects of construction safety. Accordingly, the contractor’s “Competent Person” will need to perform his/her own evaluation of the soil types and appropriate sloping and/or shoring measures. 6.0 GEOTECHNICAL RECOMMENDATIONS These recommendations are applicable for the improvements as described in the “Introduction and Site Setting” Section of this report. If other improvements not previously mentioned are included, the geotechnical engineer should be contacted for revised recommendations. Unless otherwise noted, the following definitions are used in the recommendations presented below. Where terms are not defined, definitions commonly used in the construction industry are intended. • Moisture Conditioned: Soil moisture content adjusted to just above optimum moisture content prior to application of compactive effort. • Compacted / Recompacted: Soils placed in level lifts not exceeding 8 inches in loose thickness and compacted to a minimum of 90 percent of maximum dry density; however, 95 percent should be achieved in the upper 12 inches of subgrade in areas to be paved, Page 196 of 560 City of San Luis Obispo, 2024 Sewer Upgrades April 5, 2024 San Luis Obispo, California 306551-001 5 2403-051.SER and in all aggregate base. The standard tests used to establish maximum dry density and filed density should be ASTM D 1557-12 and ASTM D 6938-17, respectively, or other methods acceptable to the geotechnical engineer and jurisdiction. Trench Backfill 1. Trench backfill can be performed with the excavated soils recompacted to a minimum of 90 percent of maximum dry density; however, 95 percent should be achieved in the upper 12 inches of subgrade in areas to be paved, and in all aggregate base. Backfill should be moisture conditioned to optimum moisture content, or just above, prior to application of compactive effort. The backfill should be placed in level lifts not exceeding 8 inches in loose thickness and compacted to the minimums recommended above. 2. All materials used as fill should be cleaned of all debris and any rocks larger than 3 inches in the maximum dimension. When fill material includes rock, the rocks should be placed in a sufficient soil matric to ensure that voids caused by nesting of the rock will not occur and the fill can be properly compacted. 3. The recommendations of this section are minimums only and may be superseded by the requirements of the architect/engineer, the recommendations of pipe manufacturers or utility companies, or the requirements of the governing jurisdiction based upon soil corrosivity or other factors. Observation and Testing 1. It must be recognized that the recommendations contained in this report are based on a limited number of borings and rely on continuity of the subsurface conditions encountered. Therefore, the geotechnical engineer should be retained to provide consultation during the design phase, to review plans as they near completion, to interpret this report during construction, and to provide construction monitoring in the form of testing and observation. 2. At a minimum, the geotechnical engineer should be retained to provide: • Review of final plans • Professional observation during trench backfill • Oversight of soil special inspection during trench backfill Page 197 of 560 City of San Luis Obispo, 2024 Sewer Upgrades April 5, 2024 San Luis Obispo, California 306551-001 6 2403-051.SER 3. Backfill and compaction of excavations and trench should be considered to fall under Section 1705.6 “Soils” of the 2022 CBC. Special inspection of backfill should be provided as per Section 1705.6 and Table 1705.6 of the 2022 CBC. The special inspector should be under the direction of the geotechnical engineer. 4. It is our opinion that none of the grading construction is of a nature that should warrant continuous special inspection; periodic special inspection should suffice assuming the work is monitored by a County of San Luis Obispo Public Works Inspector. Subject to approval by the Building Official, the exception to continuous special inspection is described in Section 1704.2 of the 2022 CBC and should be specified by the architect/engineer and periodic special inspection of the following items should be provided by the special inspector: • Verify use of proper materials, densities and lift thicknesses during placement and compaction of compacted fill 5. A program of quality assurance should be developed prior to beginning construction. At a minimum, the program should include all geotechnical items shown on the testing and inspection schedule of the approved plans. It should also include any additional inspection items required by the engineer and/or the governing jurisdiction. 6. Locations and frequency of compaction tests should be per the recommendation of the geotechnical engineer at the time of construction. The recommended test location and frequency may be subject to modification by the geotechnical engineer, based upon soil and moisture conditions encountered, size and type of equipment used by the contractor, the general trend of the results of compaction tests, or other factors. 7. A preconstruction conference among the owner, the geotechnical engineer, the governing agency, the special inspector, the project inspector, the architect/engineer, and contractors is recommended to discuss planned construction procedures and quality control requirements. 8. The geotechnical engineer should be notified at least 48 hours prior to beginning construction operations. If Earth Systems Pacific is not retained to provide construction observation and testing services, it shall not be responsible for the interpretation of the information by others or any consequences arising therefrom. Page 198 of 560 City of San Luis Obispo, 2024 Sewer Upgrades April 5, 2024 San Luis Obispo, California 306551-001 7 2403-051.SER 7.0 CLOSURE Our intent was to perform the investigation in a manner consistent with the level of care and skill ordinarily exercised by members of the profession currently practicing in the locality of this project under similar conditions. No representation, warranty, or guarantee is either expressed or implied. This report is intended for the exclusive use by the client as discussed in the “Scope of Services” Section. Application beyond the stated intent is strictly at the user's risk. This report is valid for conditions as they exist at this time for the type of project described herein. The conclusions and recommendations contained in this report could be rendered invalid, either in whole or in part, due to changes in building codes, regulations, standards of geotechnical or construction practice, changes in physical conditions, or the broadening of knowledge. If changes with respect to the project become necessary, if items not addressed in this report are incorporated into plans, or if any of the assumptions used in the preparation of this report are not correct, this firm shall be notified for modifications to this report. Any items not specifically addressed in this report should comply with the CBC of other applicable standards, and the requirements of the governing jurisdiction. The recommendations presented in this geotechnical report are based upon the geotechnical conditions encountered at the site and may be augmented by additional requirements of the client, or by additional recommendations provided by the geotechnical engineer based on peer or jurisdiction reviews, or conditions exposed at the time of construction. If Earth Systems Pacific is not retained to provide construction observation and testing services, it shall not be responsible for the interpretation of the information by others or any consequences arising therefrom. This document, the data, conclusions, and recommendations contained herein are the property of Earth Systems Pacific. This report shall be used in its entirety, with no individual sections reproduced or used out of context. Copies may be made only by Earth Systems Pacific, the client, and the client’s authorized agents for use exclusively on the subject project. Any other use is subject to federal copyright laws and the written approval of Earth Systems Pacific. Thank you for this opportunity to have been of service. If you have any questions, please feel free to contact this office at your convenience. End of Text. Page 199 of 560 City of San Luis Obispo, 2024 Sewer Upgrades April 5, 2024 San Luis Obispo, California 306551-001 8 2403-051.SER TECHNICAL REFERENCES California Building Code. 2022. California Code of Regulations, Title 24, Part 2. Google Earth. 2024. Google Earth [website], retrieved from http://www.google.com/earth/index.html Page 200 of 560 APPENDIX A Figure 1 - Site Vicinity Map Figure 2 - Exploration Location Map Boring Log Legend Boring Log Page 201 of 560 Earth Systems Pacific 4378 Old Santa Fe Road, San Luis Obispo, CA 93401 www.earthsystems.com (805) 544-3276 Fax (805) 544-1786 NOT TO SCALEBASE MAP PROVIDED BY: Google Earth (2024) Date March 2024 Project No. 306551-001 Figure 1 SITE VICINITY MAP City of San Luis Obispo, 2024 Sewer Upgrades Mill Street, Islay Street, and Sierra Way San Luis Obispo, California SITE Page 202 of 560 NOT TO SCALE Earth Systems Pacific 4378 Old Santa Fe Road, San Luis Obispo, CA 93401 www.earthsystems.com (805) 544-3276 Fax (805) 544-1786 Date March 2024 Project No. 306551-001 Figure 2 EXPLORATION LOCATION MAP City of San Luis Obispo, 2024 Sewer Upgrades Mill Street, Islay Street, and Sierra Way San Luis Obispo, California BASE MAP PROVIDED BY: City of San Luis Obispo (2024) LEGEND Boring Location (Approx.)Boring Location (Approx.)B14 B2 B1 B3 B4 B5 B6 B7 B8 B9 B10 B11 B12 B13 B14 Page 203 of 560 Page 204 of 560 DE P T H (f e e t ) US C S C L A S S SY M B O L IN T E R V A L (f e e t ) SA M P L E TY P E DR Y D E N S I T Y (p c f ) MO I S T U R E (% ) BL O W S PE R 6 I N . SAMPLE DATA SOIL DESCRIPTION Earth Systems Pacific LEGEND: Ring Sample Grab Sample Shelby Tube Sample SPT NOTE: This log of subsurface conditions is a simplification of actual conditions encountered. It applies at the location and time of drilling. Subsurface conditions may differ at other locations and times. AUGER TYPE: 6" Hollow Stem DRILL RIG: GTech GT8 with Automatic Hammer LOGGED BY: S. Venable CLAYEY SAND: brown, dense, moist (Fill) 2.5 - 5.0 End of Boring @ 11.5' No subsurface water encountered PAGE 1 OF 1 Boring No. 1 JOB NO.: 306551-001 DATE: 2/29/2024 5.0 - 6.5 42 50/5" City of San Luis Obispo, 2024 Sewer Upgrades Mill Street, Islay Street, and Sierra Way San Luis Obispo, California 4" AC / 8" AB SC 18 10.0 - 11.5 16 17 13 SANDSTONE: pale olive brown with brown mottling, very soft, moderately weathered (Franciscan Melange) Page 205 of 560 DE P T H (f e e t ) US C S C L A S S SY M B O L IN T E R V A L (f e e t ) SA M P L E TY P E DR Y D E N S I T Y (p c f ) MO I S T U R E (% ) BL O W S PE R 6 I N . SAMPLE DATA SOIL DESCRIPTION Earth Systems Pacific LEGEND: Ring Sample Grab Sample Shelby Tube Sample SPT NOTE: This log of subsurface conditions is a simplification of actual conditions encountered. It applies at the location and time of drilling. Subsurface conditions may differ at other locations and times. AUGER TYPE: 6" Hollow Stem DRILL RIG: GTech GT8 with Automatic Hammer LOGGED BY: S. Venable 1.0 - 3.0 End of Boring @ 11.5' No subsurface water encountered PAGE 1 OF 1 Boring No. 2 JOB NO.: 306551-001 DATE: 2/29/2024 5.0 - 6.5 29 50/5" City of San Luis Obispo, 2024 Sewer Upgrades Mill Street, Islay Street, and Sierra Way San Luis Obispo, California 9.5" AC / 5" AB 14 10.0 - 11.5 22 32 14 SANDSTONE: brown to very dark brown, moderately hard, moderately weathered (Franciscan Melange) SANDY LEAN CLAY: very dark brown, stiff, moist (Alluvium) SC Page 206 of 560 DE P T H (f e e t ) US C S C L A S S SY M B O L IN T E R V A L (f e e t ) SA M P L E TY P E DR Y D E N S I T Y (p c f ) MO I S T U R E (% ) BL O W S PE R 6 I N . SAMPLE DATA SOIL DESCRIPTION Earth Systems Pacific LEGEND: Ring Sample Grab Sample Shelby Tube Sample SPT NOTE: This log of subsurface conditions is a simplification of actual conditions encountered. It applies at the location and time of drilling. Subsurface conditions may differ at other locations and times. AUGER TYPE: 6" Hollow Stem DRILL RIG: GTech GT8 with Automatic Hammer LOGGED BY: S. Venable 1.0 - 5.0 End of Boring @ 11.5' No subsurface water encountered PAGE 1 OF 1 Boring No. 3 JOB NO.: 306551-001 DATE: 3/1/2024 5.0 - 6.5 16 23 City of San Luis Obispo, 2024 Sewer Upgrades Mill Street, Islay Street, and Sierra Way San Luis Obispo, California 7" AC / 10" AB 15 10.0 - 11.5 15 20 7 SANDY LEAN CLAY: brown, stiff, moist (Alluvium) CLAYEY GRAVEL WITH SAND: brown, medium dense, moist CLAYEY SAND: light brown, medium dense, moist (Residual Soil) SC GC SC Page 207 of 560 DE P T H (f e e t ) US C S C L A S S SY M B O L IN T E R V A L (f e e t ) SA M P L E TY P E DR Y D E N S I T Y (p c f ) MO I S T U R E (% ) BL O W S PE R 6 I N . SAMPLE DATA SOIL DESCRIPTION Earth Systems Pacific LEGEND: Ring Sample Grab Sample Shelby Tube Sample SPT NOTE: This log of subsurface conditions is a simplification of actual conditions encountered. It applies at the location and time of drilling. Subsurface conditions may differ at other locations and times. AUGER TYPE: 6" Hollow Stem DRILL RIG: GTech GT8 with Automatic Hammer LOGGED BY: S. Venable 1.0 - 5.0 110.4 17.5 End of Boring @ 11.5' No subsurface water encountered PAGE 1 OF 1 Boring No. 4 JOB NO.: 306551-001 DATE: 2/29/2024 5.0 - 6.5 13 18 City of San Luis Obispo, 2024 Sewer Upgrades Mill Street, Islay Street, and Sierra Way San Luis Obispo, California 24.4 4" AC / 2" AB with fabric 8 10.0 - 11.5 14 19 7 SANDY LEAN CLAY: brown, very stiff, moist (Alluvium) SC very moist Page 208 of 560 DE P T H (f e e t ) US C S C L A S S SY M B O L IN T E R V A L (f e e t ) SA M P L E TY P E DR Y D E N S I T Y (p c f ) MO I S T U R E (% ) BL O W S PE R 6 I N . SAMPLE DATA SOIL DESCRIPTION Earth Systems Pacific LEGEND: Ring Sample Grab Sample Shelby Tube Sample SPT NOTE: This log of subsurface conditions is a simplification of actual conditions encountered. It applies at the location and time of drilling. Subsurface conditions may differ at other locations and times. AUGER TYPE: 6" Hollow Stem DRILL RIG: GTech GT8 with Automatic Hammer LOGGED BY: S. Venable 1.0 - 4.0 23.2 End of Boring @ 11.5' No subsurface water encountered PAGE 1 OF 1 Boring No. 5 JOB NO.: 306551-001 DATE: 2/29/2024 5.0 - 6.5 18 19 City of San Luis Obispo, 2024 Sewer Upgrades Mill Street, Islay Street, and Sierra Way San Luis Obispo, California 11.9 2" AC / 5" Concrete / 2" AB 17 10.0 - 11.5 20 17 10 SANDY LEAN CLAY WITH GRAVEL: brown, very stiff, moist (Alluvium) CL CLAYEY GRAVEL WITH SAND: yellowish brown, medium dense, very moist GC moist Page 209 of 560 DE P T H (f e e t ) US C S C L A S S SY M B O L IN T E R V A L (f e e t ) SA M P L E TY P E DR Y D E N S I T Y (p c f ) MO I S T U R E (% ) BL O W S PE R 6 I N . SAMPLE DATA SOIL DESCRIPTION Earth Systems Pacific LEGEND: Ring Sample Grab Sample Shelby Tube Sample SPT NOTE: This log of subsurface conditions is a simplification of actual conditions encountered. It applies at the location and time of drilling. Subsurface conditions may differ at other locations and times. AUGER TYPE: 6" Hollow Stem DRILL RIG: GTech GT8 with Automatic Hammer LOGGED BY: S. Venable 1.0 - 4.0 95.5 27.3 End of Boring @ 11.5' No subsurface water encountered PAGE 1 OF 1 Boring No. 6 JOB NO.: 306551-001 DATE: 2/29/2024 5.0 - 6.5 50/5" City of San Luis Obispo, 2024 Sewer Upgrades Mill Street, Islay Street, and Sierra Way San Luis Obispo, California 7" AC / 2" AB 24 10.0 - 11.5 40 50/3" 13 SANDY LEAN CLAY: yellowish brown, very stiff, moist (Alluvium) CL CLAYEY GRAVEL WITH SAND: yellowish brown, very dense, very moist GC SANDY LEAN CLAY: dark grayish green, soft, very moist (Residual Soil) CL METAVOLCANIC ROCK: light grayish green, moderately hard, highly weathered (Franciscan Melange) Page 210 of 560 DE P T H (f e e t ) US C S C L A S S SY M B O L IN T E R V A L (f e e t ) SA M P L E TY P E DR Y D E N S I T Y (p c f ) MO I S T U R E (% ) BL O W S PE R 6 I N . SAMPLE DATA SOIL DESCRIPTION Earth Systems Pacific LEGEND: Ring Sample Grab Sample Shelby Tube Sample SPT NOTE: This log of subsurface conditions is a simplification of actual conditions encountered. It applies at the location and time of drilling. Subsurface conditions may differ at other locations and times. AUGER TYPE: 6" Hollow Stem DRILL RIG: GTech GT8 with Automatic Hammer LOGGED BY: S. Venable 1.0 - 5.0 112.0 9.0 End of Boring @ 11.5' No subsurface water encountered PAGE 1 OF 1 Boring No. 7 JOB NO.: 306551-001 DATE: 2/29/2024 5.0 - 6.5 5 6 City of San Luis Obispo, 2024 Sewer Upgrades Mill Street, Islay Street, and Sierra Way San Luis Obispo, California 5" AC / 6" AB 2 10.0 - 11.5 8 13 4 SANDY LEAN CLAY: dark brown, very stiff, moist (Alluvium) CL CL medium stiff, sand content increase LEAN CLAY: dark brown, stiff, very moist, trace sand 23.1 Page 211 of 560 DE P T H (f e e t ) US C S C L A S S SY M B O L IN T E R V A L (f e e t ) SA M P L E TY P E DR Y D E N S I T Y (p c f ) MO I S T U R E (% ) BL O W S PE R 6 I N . SAMPLE DATA SOIL DESCRIPTION Earth Systems Pacific LEGEND: Ring Sample Grab Sample Shelby Tube Sample SPT NOTE: This log of subsurface conditions is a simplification of actual conditions encountered. It applies at the location and time of drilling. Subsurface conditions may differ at other locations and times. AUGER TYPE: 6" Hollow Stem DRILL RIG: GTech GT8 with Automatic Hammer LOGGED BY: S. Venable 0.5 - 5.0 116.3 15.1 End of Boring @ 11.5' No subsurface water encountered PAGE 1 OF 1 Boring No. 8 JOB NO.: 306551-001 DATE: 2/28/2024 5.0 - 6.5 13 18 City of San Luis Obispo, 2024 Sewer Upgrades Mill Street, Islay Street, and Sierra Way San Luis Obispo, California 7" AC 5 10.0 - 11.5 12 19 6 SANDY LEAN CLAY: dark brown, stiff, moist (Alluvium) CL CL POORLY GRADED SAND WITH GRAVEL: dark yellowish brown, medium dense, moist very stiff, sand content decrease SANDY LEAN CLAY: very dark brown, stiff, moist SP 17.2 Page 212 of 560 DE P T H (f e e t ) US C S C L A S S SY M B O L IN T E R V A L (f e e t ) SA M P L E TY P E DR Y D E N S I T Y (p c f ) MO I S T U R E (% ) BL O W S PE R 6 I N . SAMPLE DATA SOIL DESCRIPTION Earth Systems Pacific LEGEND: Ring Sample Grab Sample Shelby Tube Sample SPT NOTE: This log of subsurface conditions is a simplification of actual conditions encountered. It applies at the location and time of drilling. Subsurface conditions may differ at other locations and times. AUGER TYPE: 6" Hollow Stem DRILL RIG: GTech GT8 with Automatic Hammer LOGGED BY: S. Venable 1.0 - 4.0 End of Boring @ 11.5' No subsurface water encountered PAGE 1 OF 1 Boring No. 9 JOB NO.: 306551-001 DATE: 2/28/2024 5.0 - 6.5 15 19 City of San Luis Obispo, 2024 Sewer Upgrades Mill Street, Islay Street, and Sierra Way San Luis Obispo, California 9.5" AC / 5" AB 9 10.0 - 11.5 20 26 15 SANDY LEAN CLAY: dark brown, stiff, moist (Alluvium) CL SANDSTONE: pale olive brown, very soft, highly weathered (Franciscan Melange) Page 213 of 560 DE P T H (f e e t ) US C S C L A S S SY M B O L IN T E R V A L (f e e t ) SA M P L E TY P E DR Y D E N S I T Y (p c f ) MO I S T U R E (% ) BL O W S PE R 6 I N . SAMPLE DATA SOIL DESCRIPTION Earth Systems Pacific LEGEND: Ring Sample Grab Sample Shelby Tube Sample SPT NOTE: This log of subsurface conditions is a simplification of actual conditions encountered. It applies at the location and time of drilling. Subsurface conditions may differ at other locations and times. AUGER TYPE: 6" Hollow Stem DRILL RIG: GTech GT8 with Automatic Hammer LOGGED BY: S. Venable 1.0 - 4.0 End of Boring @ 11.5' No subsurface water encountered PAGE 1 OF 1 Boring No. 10 JOB NO.: 306551-001 DATE: 2/28/2024 5.0 - 6.5 50/5" City of San Luis Obispo, 2024 Sewer Upgrades Mill Street, Islay Street, and Sierra Way San Luis Obispo, California 8" AC / 5" AB with fabric 12 10.0 - 11.5 18 19 10 SANDY LEAN CLAY: very dark brown, stiff, moist (Alluvium) CL SANDSTONE: pale olive brown, soft, moderately weathered (Franciscan Melange) Page 214 of 560 DE P T H (f e e t ) US C S C L A S S SY M B O L IN T E R V A L (f e e t ) SA M P L E TY P E DR Y D E N S I T Y (p c f ) MO I S T U R E (% ) BL O W S PE R 6 I N . SAMPLE DATA SOIL DESCRIPTION Earth Systems Pacific LEGEND: Ring Sample Grab Sample Shelby Tube Sample SPT NOTE: This log of subsurface conditions is a simplification of actual conditions encountered. It applies at the location and time of drilling. Subsurface conditions may differ at other locations and times. AUGER TYPE: 6" Hollow Stem DRILL RIG: GTech GT8 with Automatic Hammer LOGGED BY: S. Venable 0.5 - 3.5 End of Boring @ 11.5' No subsurface water encountered PAGE 1 OF 1 Boring No. 11 JOB NO.: 306551-001 DATE: 2/28/2024 5.0 - 6.5 13 City of San Luis Obispo, 2024 Sewer Upgrades Mill Street, Islay Street, and Sierra Way San Luis Obispo, California 3.5" AC / 3" AB 4 10.0 - 11.5 23 31 SANDY LEAN CLAY: very dark brown, stiff, moist (Alluvium) CL SANDSTONE:olive brown, soft, moderately weathered (Franciscan Melange) 50/2" 21 Page 215 of 560 DE P T H (f e e t ) US C S C L A S S SY M B O L IN T E R V A L (f e e t ) SA M P L E TY P E DR Y D E N S I T Y (p c f ) MO I S T U R E (% ) BL O W S PE R 6 I N . SAMPLE DATA SOIL DESCRIPTION Earth Systems Pacific LEGEND: Ring Sample Grab Sample Shelby Tube Sample SPT NOTE: This log of subsurface conditions is a simplification of actual conditions encountered. It applies at the location and time of drilling. Subsurface conditions may differ at other locations and times. AUGER TYPE: 6" Hollow Stem DRILL RIG: GTech GT8 with Automatic Hammer LOGGED BY: S. Venable 0.5 - 5.0 End of Boring @ 16.5' No subsurface water encountered PAGE 1 OF 1 Boring No. 12 JOB NO.: 306551-001 DATE: 3/1/2024 5.0 - 6.5 50/5" City of San Luis Obispo, 2024 Sewer Upgrades Mill Street, Islay Street, and Sierra Way San Luis Obispo, California 8" AC / 2" AB 19 10.0 - 11.5 50/3" 35 SANDY LEAN CLAY: brown, stiff, moist (Alluvium)CL SANDSTONE: yellowish brown to very dark brown, moderately hard, moderately weathered (Franciscan Melange) 15.0 - 16.5 50/5" Page 216 of 560 DE P T H (f e e t ) US C S C L A S S SY M B O L IN T E R V A L (f e e t ) SA M P L E TY P E DR Y D E N S I T Y (p c f ) MO I S T U R E (% ) BL O W S PE R 6 I N . SAMPLE DATA SOIL DESCRIPTION Earth Systems Pacific LEGEND: Ring Sample Grab Sample Shelby Tube Sample SPT NOTE: This log of subsurface conditions is a simplification of actual conditions encountered. It applies at the location and time of drilling. Subsurface conditions may differ at other locations and times. AUGER TYPE: 6" Hollow Stem DRILL RIG: GTech GT8 with Automatic Hammer LOGGED BY: S. Venable 0.5 - 5.0 End of Boring @ 15.0' No subsurface water encountered PAGE 1 OF 1 Boring No. 13 JOB NO.: 306551-001 DATE: 3/1/2024 5.0 - 6.5 50/5" City of San Luis Obispo, 2024 Sewer Upgrades Mill Street, Islay Street, and Sierra Way San Luis Obispo, California 6" AC / 2" AB 21 10.0 - 11.5 50/5" 30 SANDY LEAN CLAY: light brown, stiff, moist (Alluvium) CL SANDSTONE: yellowish brown to dark grayish brown, moderately hard, moderately weathered (Franciscan Melange) 15.0 - 16.5 50/1" pale grayish brown NO RECOVERY Page 217 of 560 DE P T H (f e e t ) US C S C L A S S SY M B O L IN T E R V A L (f e e t ) SA M P L E TY P E DR Y D E N S I T Y (p c f ) MO I S T U R E (% ) BL O W S PE R 6 I N . SAMPLE DATA SOIL DESCRIPTION Earth Systems Pacific LEGEND: Ring Sample Grab Sample Shelby Tube Sample SPT NOTE: This log of subsurface conditions is a simplification of actual conditions encountered. It applies at the location and time of drilling. Subsurface conditions may differ at other locations and times. AUGER TYPE: 6" Hollow Stem DRILL RIG: GTech GT8 with Automatic Hammer LOGGED BY: S. Venable 1.0 - 3.0 End of Boring @ 10.5' Perched subsurface water encountered @ 3.0' PAGE 1 OF 1 Boring No. 14 JOB NO.: 306551-001 DATE: 2/28/2024 5.0 - 6.5 8 City of San Luis Obispo, 2024 Sewer Upgrades Mill Street, Islay Street, and Sierra Way San Luis Obispo, California 8" AC / 4" AB 6 10.0 - 11.5 50/4" SANDY LEAN CLAY: dark brown, stiff, moist (Alluvium) CL SANDSTONE: olive brown, very soft, moderately weathered (Franciscan Melange) 16 moderately hard Page 218 of 560 APPENDIX B Laboratory Test Results Page 219 of 560 City of San Luis Obispo 306551-001 2024 Sewer Upgrades BULK DENSITY TEST RESULTS ASTM D 2937-17 (modified for ring liners) March 14, 2024 BORING DEPTH MOISTURE WET DRY NO.feet CONTENT, % DENSITY, pcf DENSITY, pcf 4 5.0 - 5.5 17.5 129.7 110.4 4 10.0 - 10.5 24.4 ------ 5 5.0 - 5.5 23.2 ------ 5 10.0 - 10.5 11.9 ------ 6 5.0 - 5.5 27.3 121.5 95.5 7 5.0 - 5.5 9.0 122.1 112.0 7 10.0 - 10.5 23.1 ------ 8 5.0 - 5.5 15.1 133.8 116.3 8 10.0 - 10.5 17.2 ------ Page 220 of 560 City of San Luis Obispo 306551-001 2024 Sewer Upgrades MOISTURE-DENSITY COMPACTION TEST ASTM D 1557-12 (Modified) PROCEDURE USED: A March 14, 2024 PREPARATION METHOD: Moist Boring #8 @ 0.0 - 5.0' RAMMER TYPE: Mechanical Brown Sandy Lean Clay (CL) SPECIFIC GRAVITY: 2.70 (assumed) SIEVE DATA:MAXIMUM DRY DENSITY: 117.9 pcf Sieve Size % Retained (Cumulative)OPTIMUM MOISTURE: 13.5% 3/4"0 3/8"0 ENTER OVERSIZE CORRECTION DATA #4 2 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 DR Y D E N S I T Y , p c f MOISTURE CONTENT, percent Compaction Curve Zero Air Voids Curve Page 221 of 560 City of San Luis Obispo 306551-001 2024 Sewer Upgrades PARTICLE SIZE ANALYSIS ASTM D 422-63/07; D 1140-017 Boring #4 @ 5.0 - 5.5'March 14, 2024 Sandy Lean Clay (CL) Sieve size % Retained % Passing 1/2" (12.5-mm)0 100 3/8" (9.5-mm)1 99 #4 (4.75-mm)3 97 #8 (2.36-mm)8 92 #16 (1.18-mm)12 88 #30 (600-µm)16 84 #50 (300-µm)22 78 #100 (150-µm)34 66 #200 (75-µm)46 54 1/2 3/8 4 8 16 30 50 100 200 0 10 20 30 40 50 60 70 80 90 100 0.010.1110100 PE R C E N T P A S S I N G GRAIN SIZE, mm U. S. STANDARD SIEVE NUMBERSU. S. STANDARD SIEVE OPENING IN INCHES Page 222 of 560 City of San Luis Obispo 306551-001 2024 Sewer Upgrades PARTICLE SIZE ANALYSIS ASTM D 422-63/07; D 1140-017 Boring #5 @ 5.0 - 5.5'March 14, 2024 Clayey Gravel with Sand (GC) Sieve size % Retained % Passing 3" (75-mm)0 100 2" (50-mm)0 100 1.5" (37.5-mm)0 100 1" (25-mm)0 100 3/4" (19-mm)7 93 1/2" (12.5-mm)19 81 3/8" (9.5-mm)28 72 #4 (4.75-mm)40 60 #8 (2.36-mm)52 48 #16 (1.18-mm)58 42 #30 (600-µm)62 38 #50 (300-µm)66 34 #100 (150-µm)73 27 #200 (75-µm)79 21 3 2 1.5 1 3/4 1/2 3/8 4 8 16 30 50 100 200 0 10 20 30 40 50 60 70 80 90 100 0.010.1110100 PE R C E N T P A S S I N G GRAIN SIZE, mm U. S. STANDARD SIEVE NUMBERSU. S. STANDARD SIEVE OPENING IN INCHES Page 223 of 560 Page 224 of 560