HomeMy WebLinkAboutItem 07 - COUNCIL READING FILE_b_Spec. No. 1000171 Specifications
SPECIAL PROVISIONS
FOR
CITY OF SAN LUIS OBISPO
Higuera Street Paving
Specification No. 1000171
December 2020
PUBLIC WORKS DEPARTMENT
ENGINEERING DIVISION
919 Palm Street
San Luis Obispo, CA 93401
(805) 781-7200
Higuera Street Paving
Specification No. 1000171
Approval Date: December 08, 2020
Hai Nguyen
December 08, 2020
December 08, 2020
TABLE OF CONTENTS
NOTICE TO BIDDERS ..................................................................................................... I
BID SUBMISSION ...................................................................................................................................... I
BID DOCUMENTS .................................................................................................................................... II
PROJECT INFORMATION....................................................................................................................... III
QUALIFICATIONS .................................................................................................................................... III
AWARD ..................................................................................................................................................... V
ACCOMMODATION .................................................................................................................................. V
BID FORMS .................................................................................................................... A
BID ITEM LIST FOR HIGUERA STREET PAVING, SPECIFICATION NO. 1000171 .............................. 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
2 BIDDING ............................................................................................................................................. 1
4 SCOPE OF WORK ............................................................................................................................. 1
6 CONTROL OF MATERIALS ............................................................................................................... 2
7 LEGAL RELATIONS AND RESPONSIBILITY TO THE PUBLIC ....................................................... 2
8 PROSECUTION AND PROGRESS ................................................................................................... 3
DIVISION II GENERAL CONSTRUCTION ............................................................................................... 3
15 EXISTING FACILITIES ..................................................................................................................... 3
DIVISION V SURFACINGS AND PAVEMENTS ....................................................................................... 4
39 ASPHALT CONCRETE .................................................................................................................... 4
DIVISION VIII MISCELLANEOUS CONSTRUCTION .............................................................................. 4
77 LOCAL INFRASTRUCTURE ............................................................................................................ 4
DIVISION IX TRAFFIC CONTROL DEVICES........................................................................................... 4
84 MARKINGS ....................................................................................................................................... 4
DIVISION XI MATERIALS ......................................................................................................................... 5
90 CONCRETE ...................................................................................................................................... 5
DIVISION XIII APPENDICES .................................................................................................................... 5
APPENDIX A - FORM OF AGREEMENT ....................................................................... 0
APPENDIX B – PROJECT MITIGATION MEASURES ................................................... 3
APPENDIX C – GEOTECHNICAL REPORT .................................................................. 4
NOTICE TO BIDDERS
i
NOTICE TO BIDDERS
BID SUBMISSION
Sealed bids shall be mailed to the following address:
City of San Luis Obispo
Public Works Administration
Attn: Hai Nguyen
919 Palm Street
San Luis Obispo, CA 93401
Bids delivered in person will not be accepted. All mailed bids must be delivered and in
possession of the project manager by:
2:00 p.m. on February xx, 2020
at which time bids will be publicly opened and read aloud via Skype video conference
and conference call. In-person attendance of the bid opening will not be permitted in
adherence to social distancing measures. Use the following link:
https://meet.lync.com/slocitycloud/achang/tpzqczf6?sl=1 or join by phone with this
number: 1 (209) 645-4165 with Conference ID:219881247.
Higuera Street Paving, Specification No. 1000171
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.
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
A printed copy may be obtained at the office of the City Engineer by paying a non-
refundable fee of:
1. $15.00 if picked up in person, or
2. $25.00 if by mailing to the office of the City Engineer
Request must include Specification Number. The office of the City Engineer is located at:
919 Palm Street
San Luis Obispo, CA 93401
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
A printed copy may be obtained by paying a non-refundable fee of:
1. $30.00 if picked up in person, or
2. $40.00 if by mailing to the office of the City Engineer
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.
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.
NOTICE TO BIDDERS
NOTICE TO BIDDERS
iii
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 pavement reconstruction.
The project estimated construction cost is $200,000.
Contract time is established as 25 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 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.
You must have experience constructing projects similar to the work specified for this
project. Provide three similar reference projects completed as either the prime or
subcontractor. All referenced projects must have been completed within the last five years
from this project’s bid opening date.
One of the three reference projects must have been completed under contract with
a city, county, state or federal government agency as the prime contractor.
All referenced projects must be for roadway paving.
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.
NOTICE TO BIDDERS
NOTICE TO BIDDERS
iv
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
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.
NOTICE TO BIDDERS
NOTICE TO BIDDERS
v
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.
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
Argelia Chang 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.
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 HIGUERA STREET PAVING, SPECIFICATION NO. 1000171
Item Item Unit of Estimated Item Price Total
No. SS(1) Description Measu
re Quantity (in figures) (in figures)
1 7 TRAFFIC CONTROL PLAN AND
IMPLEMENTATION LS 1 -------------
2 7 COMPLY WITH NIGHT WORK
PERMIT LS 1 -------------
3 14
COMPLY WITH MITIGATION
MEASURES AND ARCHAEOLOGICAL
MONITORING PLAN
LS 1 -------------
4 39,96
REMOVE EXISTING AND REPLACE
WITH 3" AC PAVEMENT AND
PAVING GRID
SQFT 2,593
5 40,90 REMOVE EXISTING AND REPLACE
WITH 9" PCC PAVEMENT SQFT 2,170
6 96 TRIAXIAL GEOGRID SQFT 2,170
7 26 REMOVE EXISTING AND BACKFILL
WITH CLASS 2 AGGREGATE BASE CY 260
8 15 2" MILL AND FILL SQFT 1,100
9 73
REMOVE EXISTING AND RESET
PAVERS OVER 8" REINFORCED
CONCRETE PER ENG. STD. 7355
SQFT 100
10 73
8" WIDE CONCRETE CURB BORDER
PER ENG. STD. 7355 (MISSION
STYLE)
LF 30
BID FORMS
BID FORMS
B
Item Item Unit of Estimated Item Price Total
No. SS(1) Description Measu
re Quantity (in figures) (in figures)
11 15 ADJUST & RESET MONUMENT EA 2
12 15 ADJUST WATER VALVE EA 3
13* 77 REMOVE ABANDONED WATERLINE LF 50
14 84 DETAIL 9 TRAFFIC STRIPES AND
PAVEMENT MARKERS LF 159
15 84 BIKE LANE BUFFER LF 159
16 84 DASHED GREEN BIKE LANE LF 45
17 84 LEFT TURN BIKE BOX MARKING EA 1 -------------
18 84 BIKE SYMBOL EA 1 -------------
19 12 CHANGEABLE MESSAGE SIGN
(CMS) EA 1 -------------
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 9-1.06 of the Standard Specifications. The unit price will not be adjusted regardless of
the final bid item quantity.
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.
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
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.
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:____________________
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
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 include roadway
paving?
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 include roadway
paving?
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 include roadway
paving?
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 □
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)
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. Higuera Street Paving 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
2 BIDDING
Replace Section 2-1.33A BID DOCUMENT COMPLETION AND SUBMITTAL, General
with:
Furnish bid using blank forms provided in the Special Provisions. Bid must include all
forms and must be signed by the bidder.
4 SCOPE OF WORK
Add to Section 4-1.03 WORK DESCRIPTION:
Comply with the provisions of Sections 7,12,14, 15, 39, 73, 77 and 84 for general,
material, construction, and payment specifics.
SPECIAL PROVISIONS
SPECIAL PROVISIONS
2
Add Section 4-1.03A WORK DESCRIPTION, Project Specific Signage:
Maintain Revenue Enhancement Funding signage in work area. Return Revenue
Enhancement Funding signs at the end of the project or upon the Engineer’s request.
6 CONTROL OF MATERIALS
Add to Section 6-2.03 DEPARTMENT ACCEPTANCE:
The Engineer will furnish Sales Tax signs mounted to moveable barricades. Maintain
Sales Tax signage in work area. Return Sales Tax signs at the end of the project or upon
the Engineer’s request.
7 LEGAL RELATIONS AND RESPONSIBILITY TO THE PUBLIC
Add to Section 7-1.03B PUBLIC CONVENIENCE, Traffic Control Plan
Work hours are restricted to 7:00 A.M. and 4:00 P.M (Monday through Friday) and two
lanes of traffic must be retained. Any work requiring reducing down to one lane is
restricted to night work hours.
Night work is defined as work between the hours of 7:00 P.M. and 7:00 A.M (Sunday
through Thursday). Contractor must maintain one lane of travel on Higuera. Mill & fill
paving operations are restricted to night work hours. Provide steel plates as needed per
Section 77-1.03C.
Additionally, one (1) changeable message sign (CMS) must be installed and operational
1 week prior to the start of construction and be maintained throughout the duration of the
project. Changeable message sign shall be programmed for two flashes with the
messages to be approved by the Engineer.
NIGHT WORK
Night work is permitted separately. Night work shall comply with the restrictions set forth
in the permit by the City of San Luis Obispo Community Development.
Night work is defined as work between the hours of 7:00 P.M. and 7:00 A.M.
Prior to commencing the project, the contractor must notify businesses and residences
within 300 feet of the worksite about proposed night work.
Any portable or fixed equipment that produces noise (such as generators, concrete saws,
jack hammers, etc.) must be equipped with sound blankets, temporary sound barriers, or
other attenuating devices so as to limit impacts to adjoining properties.
When not in use, equipment must be kept in its lowest (quietest) idling state or switched
off to limit noise impacts.
Any portable lighting must be shielded and/or directed away from adjacent properties.
SPECIAL PROVISIONS
SPECIAL PROVISIONS
3
Loudspeakers or other similar forms of communication is prohibited.
Contractor will provide lighting for all operations, no exceptions are to be made. Any
contractor personnel working outside the lights will be directed to return to a lighted area
or the operation must be stopped.
All contractor work vehicles, including heavy equipment, backhoes, trenching machines
must have two working headlights and taillights. Vehicles without appropriate lighting will
be kept from working until they are brought to compliance.
Illumination level of 10-foot candles is required for all nighttime operations, which will
normally be achieved with light plants or balloon lights. All lighting fixtures must be
mounted and directed in manner precluding glare to approaching traffic.
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
Add to Section 14-2.03A ARCHAEOLOGICAL RESOURCES, General
Archaeological monitoring will be required on Higuera Street 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). 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.
15 EXISTING FACILITIES
Add to Section 15-1.04 Payment
The contract price paid per square feet of cold plane shall be based on the actual area of
surface cold planed irrespective of the number of passes required to obtain the required
depth of the grind as shown on the Plans and shall include full compensation for furnishing
all labor, materials, tools, equipment, and incidentals, and doing all work involved in cold
SPECIAL PROVISIONS
SPECIAL PROVISIONS
4
planning asphalt concrete surfacing and disposing of planed material as specified in the
Standard Specification and these special provisions and as shown on the Plans, and no
additional compensation will be allowed therefore.
Add to Section 15-2.02B Remove Pavement
The outline of the area to be removed must be cut on a neat line. Paving is not to be done
without the inspection of the Engineer.
DIVISION V SURFACINGS AND PAVEMENTS
39 ASPHALT CONCRETE
Add to Section 39-1.01B Phasing
Contractor must phase milling and pavement operations such that public traffic is not
directed to traverse milled surfaces, including remaining asphalt or base material.
Contractor must submit phasing plan for review and approval.
Add to Section 39-1.02B Materials, Tack Coat
All vertical edges 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.
Add to Section 39-1.03 Hot Mix Asphalt Design Requirements
Mix voids to be targeted at 4.0%. TSR to be minimum 70 in accordance with CTM 371.
DIVISION VIII MISCELLANEOUS CONSTRUCTION
77 LOCAL INFRASTRUCTURE
Add to Section 77-1.03B(1) TRENCH CONSTRUCTION, General
All abandoned waterlines encountered partially or entirely within the limits of roadway paving
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.
DIVISION IX TRAFFIC CONTROL DEVICES
84 MARKINGS
Add to Section 84-1.04 Payment
Bike lane buffer is measured along the linear foot and accounts for all striping and cross
hatching, regardless of width of buffer.
Add to Section 84-6
84-6.01 Bike Lane Coating:
A durable epoxy modified, acrylic, waterborne coating specifically designed for application
on asphalt pavements, such as COLOR-SAFE® MMA, or approved equal* shall be
installed by manufacture certified installer per manufacture’s specifications as shown on
the plans.
SPECIAL PROVISIONS
SPECIAL PROVISIONS
5
Bike lane coating shall conform to the following Federal Highway Administration (FHWA)
requirements for green painted bike lanes.
A. The daytime chromaticity coordinates for the color used for green colored pavement
shall be as follows:
1 234
X Y X Y X Y X Y
.230 .754 .266 .500 .367 .500 .444 .555
The daytime luminance factor (y) shall be at least 7, but no more than 35.
B. The nighttime chromaticity coordinates for the color used for green colored pavement
shall be as follows:
1 234
X Y X Y X Y X Y
.230 .754 .336 .540 .450 .500 .479 .520
Prior to installation the contractor shall submit a color sample and manufacturer
specifications indicating compliance with the FHWA requirements as indicated above.
*City shall receive submittals of green paint and approve prior to application.
84-6.01
Payment must comply with section 84-1.04.
DIVISION XI MATERIALS
90 CONCRETE
Add to Section 90-1.01B Definitions:
Any PCC to be used for pavement must be Class 1 with 2% non-corrosive polar set to
allow same day AC paving and immediate traffic use.
DIVISION XIII APPENDICES
Add 100-1.01
Refer to Appendix A: Form of Agreement
Refer to Appendix B: Project Mitigation Measures
Refer to Appendix C: Geotechnical Report
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.
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
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
__________________________________
Derek Johnson, 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: ____________________
APPENDIX
APPENDIX
3
APPENDIX B – PROJECT MITIGATION MEASURES
August 2020
ARCHAEOLOGICAL MONITORING PLAN
HIGUERA STREET PAVING PROJECT
SAN LUIS OBISPO, CALIFORNIA
SPECIFICATION NO. 1000171
Submitted to:
City of San Luis Obispo
Department of Public Works
Engineering Division
919 Palm Street
San Luis Obispo, CA 93401
Prepared by:
Kerrie Collison, RPA
LSA
285 South Street, Suite P
San Luis Obispo, CA 93401
(805)782-0745
LSA Project No. CBZ1801.05
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TABLE OF CONTENTS
TABLE OF CONTENTS ............................................................................................................................... i
LIST OF ABBREVIATIONS AND ACRONYMS ............................................................................................. ii
INTRODUCTION .......................................................................................................... 1
Project Description ........................................................................................................................ 2
Background Research .................................................................................................................... 2
Project Areas to be Monitored ...................................................................................................... 3
CULTURAL SETTING ..................................................................................................... 4
Precontact ..................................................................................................................................... 4
Ethnohistory .................................................................................................................................. 5
History ........................................................................................................................................... 6
CONSTRUCTION MONITORING PLAN .......................................................................... 8
Monitoring Personnel ................................................................................................................... 8
Monitoring Procedures ................................................................................................................. 8
Unanticipated Discoveries ............................................................................................................. 9
Human Remains ............................................................................................................................ 9
Native American Monitoring ......................................................................................................... 9
Report of Findings ....................................................................................................................... 10
ARCHAEOLOGICAL SITE TESTING ............................................................................... 11
Fieldwork ..................................................................................................................................... 11
Laboratory Analysis ..................................................................................................................... 12
Sites Not Eligible for the California Register ............................................................................... 12
Sites Eligible for the California Register ...................................................................................... 12
REFERENCES ............................................................................................................. 14
TABLE
Table A: Chronological Sequence of the California Central Coast .......................................................... 4
APPENDICES
A: PROJECT FIGURES
B: PROJECT PLANS
C: RECORD SEARCH RESULTS
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LIST OF ABBREVIATIONS AND ACRONYMS
cal B.P. calibrated years before present
California Register California Register of Historical Resources
Cal Poly formerly the California Polytechnic Institute; now California Polytechnic
University, San Luis Obispo
CCIC Central Coast Information Center
CHC Cultural Heritage Committee
City City of San Luis Obispo
cm centimeter(s)
Director Community Development Director
DPR California Department of Parks and Recreation
ft foot, feet
GPS global positioning system
Guidelines Archaeological Resource Preservation Program Guidelines
MLD Most Likely Descendant
NAHC Native American Heritage Commission
National Register National Register of Historic Places
OHP California Office of Historic Preservation
Plan project archaeological monitoring plan
PRC Public Resources Code
project Higuera Street Paving Project
RPA Registered Professional Archaeologist
SLOCAS San Luis Obispo County Archaeological Society
STP shovel test pit
USGS United States Geological Survey
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INTRODUCTION
LSA has prepared this archaeological monitoring plan (Plan) for the City of San Luis Obispo (City) for
the Higuera Street Paving Project (project). The project begins at the northeast end of the
intersection of Osos Street and Higuera Street and extends southwest to the south edge of the
intersection of Court Street and Higuera Street, within the existing limits of Higuera Street between
1000 Higuera Street and 1075 Court Street, in downtown San Luis Obispo, California (Figures 1–3,
provided in Appendix A). The City’s Archaeological Resource Preservation Program Guidelines
(Guidelines), developed by the Cultural Heritage Committee (CHC), Section 1.30 defines
archaeologically sensitive areas and sites as:
A. Areas inside or within 200 feet (ft) (61 meters) of the boundaries of an archaeological site shown
on USGS topographic maps on file in the Community Development Department and/or recorded
with the Central Coast Information Center (CCIC);
B. Areas within 200 ft of top of banks of San Luis Obispo, Stenner, Brizzolara, Acacia, Old Garden,
Prefumo, and Froom Creeks;
C. Areas inside a Historical District or within an area designated as being archaeologically sensitive,
or within a burial sensitivity area as shown on maps on file at the Community Development
Department;
D. Sites designated on the Master List of Historic Resources, or determined to be eligible for listing
on the National Register of Historic Places (National Register) or California Register of Historical
Resources (California Register) (PRC Section 5024.1 (a));
E. Sites within a historically or archaeological sensitive designated by the CHC, City Council, or
other governmental agency; or
F. Sites identified as being sacred places or Traditional Cultural Properties as defined in National
Register Bulletin 38, Guidelines for Evaluating and Documenting Traditional Cultural Properties
by Northern Chumash community members who have been identified by the California Native
American Heritage Commission (NAHC) as having ancestral ties to San Luis Obispo County, or by
other local tribal representatives similarly recognized by the NAHC (City of San Luis Obispo 2009:
8-9).
The Guidelines are a model for the identification, evaluation, and preservation of archaeological and
other cultural resources in the city. They are based upon and implement policies in the City’s
General Plan Land Use Element and Conservation and Open Space Element, and are part of the
City’s environmental review process.
Per Section 4.50 of the Guidelines, construction monitoring may be required if there is a possibility
that significant or potentially significant archaeological resources are present in the impact zone of a
construction project and that it is not reasonable to conduct additional physical investigations prior
to construction (City of San Luis Obispo 2009: 18). This Plan implements Section 4.50 and presents
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the project’s background setting, construction monitoring procedures, criteria for evaluating cultural
resources identified during construction, and methods for archaeological data recovery and
mitigation (if required). Per Section 4.50 of the Guidelines, the City must review and approve this
plan prior to commencement of construction for the project.
PROJECT DESCRIPTION
The project involves the reconstruction of approximately 215 linear ft of existing pavement and
pavers on Higuera Street. Construction activities will include the removal and reconstruction of
pavement and the placement of a paver crosswalk (both of which will be accomplished via
excavation of sediments and then installation of rigid pavement over an aggregate base and
subbase), as well as a 2 inch deep “mill and fill” (the removal of the existing asphalt surface layer
with a milling machine and replacement with new asphalt). Archaeological monitoring at certain
locations will be required during excavation activities. According to project plans provided by the
City (Appendix B), excavation activities are anticipated to range to a depth of no greater than 3 ft to
4 ft below existing grade. The existing San Luis Creek Culvert will be protected in place.
BACKGROUND RESEARCH
Section 4.50 of the Guidelines requires construction monitoring if it is not reasonable to conduct
additional physical investigations prior to construction. Due to the paved nature of the project,
physical investigation of the project site was not reasonable. To determine which portions of the
project site are sensitive for cultural resources, per Section 1.30 of the Guidelines, a record search
for the project site and a 0.25-mile radius was conducted at the CCIC of the California Historical
Resources Information System at the University of California, Santa Barbara. The CCIC, an affiliate of
the California Office of Historic Preservation (OHP), is the official repository of cultural resources
records and reports for San Luis Obispo County. The record search also included a review of the
following State and federal inventories:
• Directory of Properties in the Historic Property Data File (OHP 2012). The directory includes the
listings of the National Register of Historic Places, National Historic Landmarks, the California
Register of Historical Resources, California Historical Landmarks, and California Points of
Historical Interest.
• California Historical Landmarks (OHP 1996).
• California Points of Historical Interest (OHP 1992).
• Five Views: An Ethnic Historic Site Survey for California (OHP 1988).
• California Inventory of Historic Resources (OHP 1976).
The record search results indicate that five previous cultural resources studies have included a
portion of the project site, and 72 cultural resources studies have included the 0.25-mile radius
around the project site (CCIC Record Search 20-158; Appendix C). The five studies that have included
a portion of the project site were field surveys (2), an architectural field survey (1), construction
monitoring (1), and archaeological excavation (1). The additional 72 studies included surveys (35),
excavations (13), monitoring (15), literature search (1), architectural evaluations (6), and reports of
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unclassified types (2). Two cultural resources have been recorded within the project site as a result
of previous cultural resources studies. One is a historic trash deposit discovered under the pavement
of Higuera Street (P-40-1262) and the other consists of a historic trash deposit and historic building
foundations within the Court Street mixed-use complex (P-40-2287). Within the 0.25-mile radius, an
additional 124 resources have been recorded – of which nine are archaeological resources and 115
are built environmental resources. The nine archaeological resources consist of a site with
precontact burials, the historic Mission San Luis Obispo de Tolosa, a historic Mission-related site,
four historic trash deposits, a precontact occupation site, a historic school site and associated
features.
PROJECT AREAS TO BE MONITORED
Based on the results of the record search at the CCIC as well as an examination of maps, site
records, and archaeological reports, archaeological monitoring is not required for the entire project
site. Whether monitoring is required is dependent upon the type of ground disturbance being
conducted.
Previous ground disturbing work in the project site and its immediate vicinity have resulted in the
identification and recording of archaeological cultural resources dating to both precontact and the
historic period. As such, the project site is in an area of high archaeological sensitivity and
archaeological monitoring is required for the majority of excavation activities within the project site.
Archaeological monitoring is required for all project excavation activities on Higuera Street with the
exception of mill and fill activities. Monitoring is not required during mill and fill activities due to the
extremely shallow and limited depth of disturbance of 2 inches below existing grade (Appendix A,
Figure 3).
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CULTURAL SETTING
PRECONTACT
Early California archaeologists largely passed over the Central Coast of California until cultural
resources management took off in the 1970s (Jones et al. 2007: 130). Jones et al. (2007) employ a
chronological system for Central Coast Prehistory that incorporates periods, locally defined phases,
and regional cultures. For San Luis Obispo and the Central Coast, the six periods of cultural
chronology are Late, Middle/Late Transition, Middle, Early, Milling Stone/Early Archaic, and Paleo-
Indian (Table A) (Jones et al. 2007).
Table A: Chronological Sequence of the California Central Coast
Period Temporal Span (A.D./B.C.) Temporal Span (B.P.)
Late A.D. 1250 to 1769 700 B.P. to historic
Middle/Late Transition A.D. 1000 to 1250 1000 to 700 cal B.P. 1
Middle 600 B.C. to A.D. 1000 3000 to 1000 cal B.P.
Early 3500 to 600 B.C 5500 to 3000 cal B.P.
Milling Stone/Early Archaic 8000 to 3500 B.C. 10,000 to 5500 cal B.P.
Paleo-Indian Pre-8000 B.C. Pre-10,000 cal B.P.
Source: Jones et al. (2007)
1 cal B.P. is calibrated years before present.
Paleo-Indian Period (Pre-10,000 cal B.P.)
Early human presence in San Luis Obispo is suggested only by fluted project points from two
locations in San Luis Obispo County: Nipomo and near Santa Margarita. However, no other evidence
has been found to suggest habitation during this period (Jones et al. 2007: 135).
Milling Stone Culture (10,000 to 5500 cal B.P.)
The Milling Stone Culture is marked by “large numbers of well-made handstone and/or milling slabs,
crude core and cobble-core tools, and less abundant flake tools and large side-notched projectile
points” (Jones et al. 2007: 135). Pitted stones, contracting stemmed points, lanceolate points, and
crescents have also been found in the context of some Milling Stone sites. Occupation dating to the
Milling Stone has been identified at no fewer than 42 sites in various settings—rocky coasts,
estuaries, and nearshore interior valleys. As very few sites with Milling Stone components have been
found farther than 15 miles from the shore and most interior Milling Stone sites produce marine
shells, it is believed that many groups from the Milling Stone period maintained some form of a
connection with the coast (Jones et al. 2007: 135-137).
Early Period (5500 to 3000 cal B.P.)
The Early Period is marked by the co-occurrence of contracting-stemmed and Rossi square-stemmed
points, as well as large-notched type points leftover from the Milling Stone Culture. Ground stone
assemblages from the Early Period contain handstones and milling slabs, along with pitted stones.
During this period, portable mortars and pestles appeared and the frequency of cobble-core tools
decreased (Jones et al. 2007: 138).
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Middle Period (3000 to 1000 cal B.P.)
Middle Period sites contain assemblages of contracting-stemmed points. These sites are also
marked by the disappearance of the square-stemmed and large side-notched points. Ground stone
assemblages reveal continued use of both slabs/handstones and portable mortars/pestles. Pitted
stones and groove stone net sinkers are also commonly found at Middle Period sites. Bone flutes are
occasionally found in association with burials dating to the Middle Period, and other burial
accompaniments include bone tubes and Olivella beads. Toward the end of the Middle Period,
smaller leaf-shaped projectile points appeared, marking the arrival of bow-and-arrow technology
(Jones et al. 2007: 138-139).
Middle/Late Transition (1000 to 700 cal B.P.)
The transition between the end of the Middle Period and the beginning of the Late Period was
marked by dramatic changes in assemblages and settlement patterns. This change was evidenced by
the appearance of large numbers of arrow points, the disappearance of most stemmed points, and
changes in bead types. The transition time dates slightly differently for various Chumash tribes, but
in San Luis Obispo County the transition occurred sometime between A.D. 900 and A.D. 1280.
Archaeological site CA-SLO-9 contained an assemblage dating to this time that was dominated by
contracting-stemmed projectile points, small leaf-shaped arrow points, notched line sinkers, circular
shell fishhooks, and Olivella saucer beads (Jones et al. 2007: 139).
Late Period (700 B.P. to historic)
Late Period sites contain assemblages consisting of large numbers of Desert side-notched and
Cottonwood arrow points, small bifacial bead drills, bedrock mortars, hopper mortars, lipped and
cupped Olivella beads, and steatite disk beads. The period is marked by single-component sites
concentrated in the interior of the region, as opposed to concentrated in the coastal part of the
region. Many sites dating to the Late Period are marked by small middens with associated (or
nearby) bedrock mortars.
ETHNOHISTORY
The project site is within an area prehistorically occupied by the Northern (Obispeño) Chumash. The
Obispeño Chumash are a subdivision within the larger Chumash cultural family and are named after
their historical attachment to Mission San Luis Obispo de Tolosa, which was founded in 1772
(Greenwood 1978: 520). Early accounts of the Obispeño Chumash imply a hunter-gatherer lifestyle,
but other aspects of accounts indicate that there was also a high level sociopolitical complexity
(Jones et al. 2007: 129). Additionally, a house floor measuring 30 ft in diameter at Morro Bay was
discovered during excavations (Greenwood 1978: 520), suggesting the existence of sedentary
villages.
There are fewer historical accounts and ethnographic studies of the Obispeño Chumash than for the
Chumash of the Santa Barbara Channel. No villages were recorded by European visitors to the area;
Pedro de Unamuno (1587), Sebastian Cermeño (1595), Gaspar de Portolá (1769), and Lieutenant
Pedro Fages (1772) all kept diaries, but none of them described large or heavily populated villages
like those seen along the Santa Barbara Channel (Greenwood 1978: 520). While none of these
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expeditions reported large villages and, at the same time, the 30-ft house floor was found in Morro
Bay in what is reportedly within sight of the Portolá camp, it is possible that villages flourished and
declined before the years of European exploration. By the time historical contact occurred, the
majority of Chumash houses were small, round, and domed. Other individuals apparently lived out
in the open, and some dwellings near Morro Bay were constructed as a round hole with branches
for a roof (Greenwood 1978: 521).
While the archaeological record demonstrates that the Chumash exploited marine food resources,
conditions did not favor the canoe and most marine food was harvested by hand, trap, pole, net,
and hook-and-line from tidal pools and shallow waters (Greenwood 1978: 522). Obispeño chiefs had
many wives and retained the right to divorce them. Social rank was derived from material wealth,
and the chief received offerings of food, goods, and beads from those in the village (Greenwood
1978: 523). In 1914 and 1915, the last Obispeño speaker (Rosario Cooper) provided some details of
Chumash life to American linguist and ethnologist J.P. Harrington, including cures for witchcraft,
beliefs in nature, dances associated with the swordfish and coyote, and offerings thrown to the
swordfish in Avila. Cooper also told Harrington of a game played with wild walnuts filled with brea,
and of material culture items like brooms of juncus stalks, sleeping mats, foxskin quivers, and the
use of white clay for shampoo (Greenwood 1978: 523).
Following the establishment of the mission in San Luis Obispo and the conversion of the Chumash
people, already-declining coastal villages suffered high mortality rates and the villages became
barely inhabited. Obispeño culture also rapidly disappeared as a result of missionization
(Greenwood 1978: 523). In 1803, Chumash population at the Mission was recorded to be 919; by
1838, the population was down to 170. By the time the Bureau of Indian Affairs compiled the Roll of
1928, only four Native Americans claimed to be survivors of San Luis Obispo neophytes (Greenwood
1978: 521).
HISTORY
Following its founding in 1772, Mission San Luis Obispo de Tolosa quickly became self-sufficient, and
it was used as a stopover for those traveling between missions to the north and south of San Luis
Obispo (HRG 2013: 13–14). Spanish and Mexican ranchos extended across what is now San Luis
Obispo County but were subdivided after California’s admission to the Union in 1850 and the
California Land Act of 1851. The California Land Act caused many rural landowners in the county to
migrate into the City of San Luis Obispo, which was designated as the county seat in 1868. The
Southern Pacific Railroad arrived in town in the late 1890s, and the California Polytechnic Institute
(now California Polytechnic University, San Luis Obispo) (Cal Poly) was established in 1901 (HRG
2013: 14). The Mission and Cal Poly influenced the community’s growth, as did William Randolph
Hearst’s San Simeon Ranch, which is more commonly known today as Hearst Castle.
Development in San Luis Obispo began to expand in the 1900s due to the advent of the automobile,
and tourism—particularly automobile tourism—played a role in the area’s continued development.
While it affected most of the country, the Great Depression’s economic impacts in San Luis Obispo
were mitigated by the establishment of a military training camp, Camp San Luis Obispo. The
establishment of the camp led to a dramatic increase in population, and the camp continued
to draw in military families as training activity increased in preparation for World War II
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(HRG 2013: 15). Many soldiers permanently settled in San Luis Obispo after returning from the war,
which spurred a need for single-family housing in the 1950s and 1960s (HRG2013: 15). The United
States Census Bureau estimates that, as of July 1, 2017, the population of the city of San Luis Obispo
was 47,541.
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CONSTRUCTION MONITORING PLAN
MONITORING PERSONNEL
A qualified archaeological monitor will observe all project-related excavation activities on Cuesta
Drive and Loomis Street. Native American monitors will not initially be on site during construction.
The archaeological monitor for the project will be a Registered Professional Archaeologist (RPA) or
will be under the direction supervision of the RPA. Monitors will be thoroughly briefed in monitoring
methodology, responsibilities, procedures, safety requirements, and rules. The archaeological
monitor will also retain a copy of this Monitoring Plan while on duty. For this project, the LSA Project
Manager and Project Archaeologist (Kerrie Collison, M.A., RPA No. 28731436) will oversee
monitoring operations. The archaeological monitoring schedule will be coordinated with the City
Inspector or other City staff (or their designated representative) as appropriate.
MONITORING PROCEDURES
Prior to the commencement of excavation activities on the first day of monitoring, an LSA
archaeologist will provide cultural resources awareness training to construction personnel. This
training should be in the form of a presentation and handout describing the types of possible
archaeological deposits that may be encountered during construction activities and the procedures
that should be used in the event of inadvertent discoveries of cultural resources during
construction.
All ground-disturbing activities within the designated monitoring areas, including clearing, grubbing,
tree removal, grading, boring, digging, trenching, and other related activities will be monitored by
the archaeological monitor. The archaeological monitor will record archaeological deposits
identified during monitoring, unless field observations indicate that the deposits are not in situ. The
monitor will complete a daily form that identifies the date and location of the monitoring as well as
any cultural resources that are identified. Photographs will be taken of monitoring activities and as
part of resource documentation, as necessary.
If archaeological cultural resources are identified during monitoring, the monitor will be empowered
to temporarily halt construction and flag the resource to protect it from project activities that may
disrupt it. The monitor will make an initial assessment of the potential for the find to qualify as a
historical or unique archaeological resource under the California Environmental Quality Act (Public
Resources Code Sections 21084.1 and 23082.3), and, as warranted, make recommendations for
additional analysis necessary (including excavation) to formally evaluate the eligibility of the find for
the California Register. Eligibility of the resource for the California Register would depend on a
combination of factors, including the horizontal and vertical extent of the archaeological deposits,
the type and relative abundance of archaeological material found, and the extent of prior
disturbance of the deposits, if any. Archaeological materials can include artifacts, ecofacts, and
discrete features.
LSA will immediately notify the Community Development Director (Director) of any archaeological
finds during project work, per Section 4.60.1 of the Guidelines.
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UNANTICIPATED DISCOVERIES
If archaeological cultural resources are found during the project, the following procedures would be
implemented. If the find is not human remains, the area of the archaeological find would be flagged
for avoidance at a distance determined by the monitor to avoid impacts to the resource by
construction activities. The monitor would determine whether the find is an isolate (one or two
cultural items located within 50 meters [164 ft]) of a site (three or more cultural items within 50
meters).
If the find is determined to be an isolate, its location would be recorded using a handheld global
positioning system (GPS) unit, the material collected, the resource characteristics recorded, and
construction activities allowed to resume. If the find is determined to be an archaeological site,
earth-moving activities would be diverted until the site type and boundary can be determined by
following appropriate testing-evaluation procedures (discussed in further detail in Section 0 of this
Plan). Regardless of whether the find is an isolate or site, all resources would be photographed and
mapped using GPS, and descriptive notes would be taken before construction work would be
allowed to resume.
HUMAN REMAINS
If human remains are found, the requirements of State Health and Safety Code Section 7050.5 must
be met. State Health and Safety Code Section 7050.5 states that no further disturbance shall occur
until the County Coroner has made a determination of origin and disposition pursuant to State
Public Resources Code Section 5097.98. The County Coroner must be notified of the find
immediately. If the remains are determined to be Native American, the County Coroner would notify
the Native American Heritage Commission, which would determine and notify a Most Likely
Descendant (MLD). With the permission of the landowner or his/her authorized representative, the
MLD may inspect the site of the discovery. The MLD shall complete the inspection and make
recommendations or preferences for treatment within 48 hours of being granted access to the site.
The MLD recommendations may include scientific removal and nondestructive analysis of human
remains and items associated with Native American burials, preservation of Native American human
remains and associated items in place, relinquishment of Native American human remains and
associated items to the descendants for treatment, or any other culturally appropriate treatment.
In brief, the area of the find of human remains would be flagged off so that construction activity
within at least 25 ft of the discovery would be redirected elsewhere, and the County Coroner (as
well as the Director) would be notified immediately. Project activities would avoid any impacts to
the human remains.
NATIVE AMERICAN MONITORING
A Native American tribal representative would be contacted in the event that Native American
artifacts are encountered during ground-disturbing activities. If this occurs, the Native American
tribal representative would be invited to observe remaining project ground-disturbing activities for
additional Native American artifacts.
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REPORT OF FINDINGS
Upon completion of the construction monitoring (and any necessary laboratory operations, as
discussed below), LSA will prepare a monitoring report documenting the monitoring results and the
status of cultural resource(s), if applicable. If no archaeological cultural resources are found during
construction, the monitoring report would be a brief letter report submitted to the Director. If
monitoring is positive and results in the identification of cultural resources, the report would be
consistent with the Guidelines of the State Office of Historic Preservation’s Archaeological Resource
Management Reports (ARMR): Recommended Contents and Format (OHP 1990) and would be
submitted to the Director. A positive findings report will include the following information:
1. The location and dates of monitoring.
2. The methodology and procedures for field and laboratory work.
3. The location, description, and eligibility determination of the cultural resource(s) found during
monitoring.
4. All forms (archaeological monitoring, photographic record, and artifact record) completed as a
part of monitoring will be provided as appendices to the report. State of California Department
of Parks and Recreation (DPR) Series 523 forms will be prepared in accordance with the
guidelines established by the OHP for cultural resources found during the project.
5. The status of curation of the material found.
Copies of any report prepared for this project will be submitted to the City and to the CCIC.
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ARCHAEOLOGICAL SITE TESTING
If potentially significant, intact archaeological deposits or human remains are identified during
construction monitoring, construction would be temporarily halted and the area of the find would
be flagged for avoidance at a distance determined by the monitor to avoid impacts to the resource
by construction activities (at least 25 ft in the case of human remains). The LSA Project archaeologist
will contact the City and determine whether archaeological site testing is necessary. If determined
necessary, archaeological site testing would be conducted to evaluate site importance/significance
and, therefore, site eligibility for listing in the California Register.
The archaeological site testing procedures will be conducted in a manner consistent with standard
accepted professional archaeological methodology. Testing procedures can include surficial artifact
collection, and excavation using shovel test pits (STPs), 1x1 meter excavation units, mechanized
trenching, or a combination of these methods.
Fieldwork
Test excavation will consist of the excavation of STPs and 1x1 meter units. These excavations will be
used to determine the character, integrity, and vertical (depth) and horizontal (size) extent of the
site. Placement of STPs will be on a north-south axis or along the axis of greatest site length,
whichever is more appropriate for a particular site. STPs will be excavated to determine the extent
of midden deposits and to generally identify site areas where cultural material exists in quantity.
STPs will measure approximately 40 centimeters (cm; 16 inches) in diameter and will be hand-
excavated in 20 cm (8-inch) levels to a culturally sterile level or to a depth no greater than 100 cm
(39 inches). Sediment from each STP level will be passed through 1/8-inch mesh screen and all
cultural material will be saved in labeled Ziploc bags. Notes recorded at the time of excavation will
identify sediment color, depth, and cultural material from each STP. Bagged material will be
transported to the LSA laboratory for cleaning, sorting, identification, analysis, and curation.
Based on the results of the STPs, units will be excavated to more accurately identify material density
and depth. Units will be placed in areas of the site shown to contain the greatest potential for
finding the deepest midden deposits, as well as the greatest quantity and diversity of cultural
material. Excavation units will be hand-excavated in 10 cm (4-inch) levels following the natural
surface contour. Excavated sediment will be screened through 1/8-inch mesh and cultural material
from each level will be saved in labeled Ziploc bags. Bagged material will be transported to the LSA
laboratory for cleaning, sorting, identification, analysis, and curation. Unit excavation will cease
when sterile sediment or bedrock is encountered.
During the course of unit excavation, if a distinct sediment type is identified, excavation may change
to follow this new contour in 10 cm (4-inch) levels until it disappears or until another change occurs,
whereupon excavation following the natural surface contour will resume. Once excavation ends, an
STP may be placed in the unit floor to confirm that additional cultural material does not exist below
what is thought to be the bottom of the unit.
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During unit excavation, a line-level placed at the ground surface will be used to record the basal
depth of in situ artifacts and features. Fire-affected rock will be counted and weighed. Notes,
measurements, and drawings will be recorded on unit level forms during excavation. Items and
samples given exact provenance will be sketched on the floor plan of the appropriate level form.
After excavation, one wall of each unit will be profiled and photographed. The wall selected will be
the wall displaying the most representative stratigraphic development, including residual features.
Distinctive subsurface horizons will be described by sediment type and color using the Munsell Color
Chart.
LABORATORY ANALYSIS
All collected material remains the property of the landowner (for this project, the City). All artifacts
and ecofacts collected during monitoring will be taken to the LSA laboratory where they will be
cleaned and prepared for analysis. Cataloging and processing will take place based on methods for
each material class; material will be cataloged as individual artifacts or as groups of ecofacts, as
appropriate. Items may be analyzed by specialists, as warranted.
Ecofactual material such as (nonhuman) bone, charcoal, and/or shell may be submitted for
radiocarbon testing that can reveal the age of the material analyzed. Similarly, artifacts made of
obsidian (volcanic glass) may be submitted for sourcing and hydration analyses that will reveal the
geochemical source and time of manufacture. Other specialized studies may be conducted, but will
be dependent upon the presence of material. Items such as beads and fish ear bones (otoliths) can
provide information on chronological site occupation and seasonality, although these items must be
found before specialized studies can occur. Items will be prepared for curation in accordance with
standardized curation guidelines, and will be temporarily curated at LSA until they are deposited
with an approved curation facility. LSA anticipates that curation of any items recovered during this
project will take place at the San Luis Obispo County Archaeological Society (SLOCAS) Curation
Facility on the Cuesta College campus. Final cataloging and artifact preparation will be consistent
with SLOCAS requirements.
SITES NOT ELIGIBLE FOR THE CALIFORNIA REGISTER
Should site testing indicate the site is not eligible for listing in the California Register, then the
resource shall be fully recorded on DPR Series 523 Forms and construction activities allowed to
resume.
SITES ELIGIBLE FOR THE CALIFORNIA REGISTER
Series 523 DPR forms will be completed to record site location and to provide material descriptions.
Completed forms will be appended to the monitoring report. Should site testing indicate that the
site may be eligible for listing on the California Register, then adverse effects to the resource shall be
avoided, or effects mitigated. Avoidance of impacts to resources is always the preferred alternative,
although where avoidance is not feasible mitigation of impacts to a resource can consist of, but is
not limited to, excavation in accordance with a data recovery plan.
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Data Recovery Excavation and Reporting
Mitigation of impacts to an important (significant) resource can include excavation of the deposit in
accordance with a data recovery plan (California Code of Regulations Title 14(3) Section
15126.4(b)(3)(C)), which states:
When data recovery through excavation is the only feasible mitigation, a data
recovery plan, which makes provision for adequately recovering the scientifically
consequential information form and about the historical resource, shall be prepared
and adopted prior to any excavation being undertaken. Such studies shall be
deposited with the California Historical Resources Regional Information Center.
Archaeological sites known to contain human remains shall be treated in
accordance with the provisions of Section 7050.5 Health and Safety Code.
As such, if a resource determined to be important and eligible for listing in the California Register is
found during the project, then an attempt to avoid the resource through project redesign or other
means would be made. If it is determined that the only feasible alternative is excavation and
removal of the resource, a data recovery plan shall be written describing the scientific methodology
to be employed during excavation. The data recovery plan will employ a research design to guide
the excavation. Any studies developed as part of this effort will be reported upon in a manner that
adheres to current professional standards, and reports will be filed with the City and the CCIC.
If additional material is exposed at the same site after impacts have been mitigated, additional
mitigation (excavation) will not be required unless the new material represents a new type of data
(artifact classes and/or features) not recovered during previous mitigation.
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REFERENCES
California Office of Historic Preservation (OHP)
1976 California Inventory of Historic Resources. California Department of Parks and Recreation,
Sacramento.
1988 Five Views: An Ethnic Historic Site Survey for California. California Department of Parks and
Recreation, Sacramento.
1990 Archaeological Resource Management Reports (ARMR): Recommended Contents and
Format. February.
1992 California Points of Historical Interest. California Department of Parks and Recreation,
Sacramento.
1996 California Historical Landmarks. California Department of Parks and Recreation,
Sacramento.
2012 Directory of Properties in the Historic Property Data File. California Department of Parks
and Recreation, Sacramento. April 5.
City of San Luis Obispo
2009 Archaeological Resource Preservation Program Guidelines. Adopted October 20, 2009, by
the San Luis Obispo City Council, Resolution No. 10120 (2009 Series). On file, LSA
Associates, Inc. Available online: http://www.slocity.org/home/showdocument?id=4140.
Greenwood, Roberta S.
1978 Obispeño and Purisimeño Chumash. In R. Heizer ed., Handbook of North American Indians,
Vol. 8, California, pp. 520-523. Smithsonian Institution, Washington D.C.
Historic Resources Group (HRG)
2013 City of San Luis Obispo Citywide Historic Context Statement. September 30. On file, LSA,
San Luis Obispo, California.
Jones, Terry L., Nathan E. Stevens, Deborah A. Jones, Richard T. Fitzgerald, and Mark G. Hylkema
2007 The Central Coast: A Midlatitude Milieu. In California Prehistory: Colonization, Culture, and
Complexity. Terry L. Jones and Kathryn A. Klar, eds. pp. 125-146. AltaMira Press, Lanham,
Maryland.
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APPENDIX A
PROJECT FIGURES
Figure 1: Project Vicinity
Figure 2: Project Location
Figure 3: Project Site and Monitoring Area
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SOURCE: Esri (2019)
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FIGURE 1
Higuera Street Paving
Project Vicinity
LEGEND
Project Location
0 3 6
MILES
Project Location
SOURCE: USGS 7.5' Quad. San Luis Obispo, CA (1994)
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FIGURE 2
Higuera Street Paving
Project Location
LEGEND
Project Location
0 1000 2000
FEET
SOURCE: Bing Maps, 2020
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FIGURE 3
Higuera Street Paving
Project Site and Monitoring Area
LEGEND
Project Location
Project Site (Archaeological Monitoring Required)
Project Site (No Archaeological Monitoring Required)
0 50 100
FEET
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Higuera StreetMarsh Street
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APPENDIX B
PROJECT PLANS
general notes:HIGUERA STREET PAVINGAPPROVED BYSPECIFICATION NO.DATESHEETManuel Guzman, Construction Engineering ManagerR.C.E. C78236Approved Datefor Matthew A. Horn, City Engineer OCTOBER 20201000171FILE NO./LOCATIONCIVILR EGISTER
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NUEL GUZMANPROJECTLOCATION1.ALL WORK SHALL BE PERFORMED IN CONFORMANCE WITH THESEPLANS, SPECIAL PROVISIONS PREPARED FOR THIS PROJECT AND THE2020 CITY OF SAN LUIS OBISPO STANDARD SPECIFICATIONS ANDENGINEERING STANDARDS, IN CONJUNCTION WITH THE STATE OFCALIFORNIA DEPARTMENT OF TRANSPORTATION STANDARDSPECIFICATIONS AND STANDARD PLANS, 2015 EDITION (UNREVISED).2.IT SHALL BE THE RESPONSIBILITY OF THE CONTRACTOR OR PERMITTEETO CONTACT "UNDERGROUND SERVICE ALERT OF NORTHERN/CENTRALCALIFORNIA" BY PHONE AT 8-1-1 FORTY-EIGHT (48) HOURS PRIOR TOSTART OF CONSTRUCTION FOR LOCATION OF POWER, TELEPHONE, OILAND NATURAL GAS UNDERGROUND FACILITIES. CONTRACTOR ORPERMITTEE SHALL ALSO CONTACT THE APPROPRIATE AGENCY FOR THELOCATION OF CABLE T.V., WATER, SEWER, DRAINAGE ORUNDERGROUND FACILITIES.3.THE CONTRACTOR SHALL POSSESS A CLASS "A" LICENSE AT THE TIMETHE BIDS OPEN AND DURING THE ENTIRE LENGTH OF THE CONTRACT.4.THESE PLANS DO NOT INDICATE ALL EXISTING FACILITIES IN THEVICINITY OF THE PROPOSED WORK SUCH AS EXISTING IRRIGATIONHEADS AND LINES, SHRUBBERY AND VEGETATION, ETC. THECONTRACTOR MUST USE CARE TO AVOID DAMAGE TO ANY EXISTINGIMPROVEMENTS OR VEGETATION IN THE VICINITY OF THE WORK, ANDMUST REPAIR ANY FACILITIES DAMAGE DURING CONSTRUCTION TO THESATISFACTION OF THE ENGINEER.5.ANY EXISTING UTILITIES AND IMPROVEMENTS THAT BECOME DAMAGEDDURING CONSTRUCTION SHALL BE COMPLETELY RESTORED TO THESATISFACTION OF THE ENGINEER AT THE CONTRACTOR'S SOLEEXPENSE.6.CONTRACTOR SHALL CONTACT ALL UTILITY COMPANIES AND AGENCIESWITH SERVICES IN THE AREA PRIOR TO COMMENCING CONSTRUCTIONACTIVITIES AND COORDINATE WITH THE UTILITY COMPANIES AFFECTEDBY CONSTRUCTION.7.PRIOR TO THE START OF CONSTRUCTION, THE CONTRACTOR'SLICENSED LAND SURVEYOR SHALL FILE A CORNER RECORD IN THEOFFICE OF THE SAN LUIS OBISPO COUNTY SURVEYOR FOR EACHEXISTING MONUMENT WITHIN THE PROJECT AREA THAT HAS THEPOTENTIAL TO BE DISTURBED.8.PROTECT SURVEY MONUMENTS IN PLACE DURING CONSTRUCTION. THECONTRACTOR SHALL BE RESPONSIBLE FOR ALL COSTS ASSOCIATEDWITH THE REPLACEMENT OF DAMAGED OR DISPLACED SURVEYMONUMENTS AND SHALL NOTIFY THE CITY FIVE (5) WORKING DAYSPRIOR TO RESTORING MONUMENTS. MONUMENTS SHALL BE RESET BYA CALIFORNIA LICENSED LAND SURVEYOR AND SHALL INCLUDEPREPARING AND FILING A CORNER RECORD WITH SAN LUIS OBISPOCOUNTY.9.ALL STRIPING AND MARKINGS MUST TRAFFIC RATED PAINT. ANYSTRIPING NOT MARKED FOR REMOVAL SHALL BE PROTECTED IN PLACE.10.STRIPING LAYOUT MUST BE REVIEWED AND APPROVED BY THEENGINEER PRIOR TO INSTALLATION.11.ALL CURB AND CROSSWALK IMPROVEMENTS MUST BE COMPLETEDPRIOR TO THE START OF PAVING WORK.12.ACCESS TO BUSINESSES NEEDED AT ALL TIMES. NO CLOSURE OF THEDRIVEWAYS WILL BE ALLOWED.13.CONTRACTOR MUST MEET THE COMPACTION RECOMMENDATIONSUSING NON-VIBRATORY METHODS.san luis obispo county, californiaindex to planssheet no.description123COVER SHEETPAVING PLANSTRIPING PLANReference Documents:City Standard Specifications - 2020 EditionCity Engineering Standards - 2020 Edition31ofN
WWWWWWWWWSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSDSDSDSDSDSDSDWWWWWWWWWWWWWWWWWWWWWWWAWAWAWAWAWAWAWAWAWAWAWAWAWAWAWAWAWAWAWAWAWAWAWAWAWAWAWEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEETTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTGGGGGEEEEEEEEEEEAWAWAWAWAWAWAWAWAWAWGGGGGGGGTSTSTSTSTSTSTSTSTSTSTSTSTSEEEEEEEEEEWWWWWSDSDTTTTTTTTTTHIGUERA STOSOS ST6'20'159'10'22'10'45'SAN LUIS CREEK CULVERT(E) 8" PVC WATER(E) 8" PVC SEWER(E) 4" WATER (ABND)(E) 8" PVC SEWER(E) 4" WATER (ABND)(E) 8" PVC WATER(E) CATV(E) ELECTRIC(E) TELEPHONECOURT ST(E) 2" GAS(E) 2" GAS(E) 4" WATER (ABND)(E) 10" DI WATER(E) 8" PVC WATER(E) 4" WATER (ABND)(E) CATV(E) 8" PVC SEWER(E) 2" GAS(E) TELE(E) 4" WATER (ABND)(E) 6" SEWER(E) 18" SD(E) 10" W(E) AT&T(E) AT&T(E) SIGNAL(E) ELECTRIC(E) ELECTRI
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(E) SIGNAL(E) ELECTRIC(E) CATV1444256893BANANA REPUBLIC990 HIGUERAABERCROMBIE & FITCH980HIGUERAUNION BANK995 HIGUERAPEET'S COFFEE1075 COURTFIRESTONE GRILL1001 HIGUERAWOODSTOCK'S PIZZA1000 HIGUERA7R40±CITY SPECIFICATION NO.DATE:PROJECT TITLE:
SHEET TITLE:ofSHEET NO.DESIGNED BY:DRAWN BY:CHECKED BY:APPROVED BY:SCALE:PLAN FILE NO. / LOCATIONHIGUERA STREET PAVING
1" = 20'PAVING PLANHNHNMG/BNMHOCTOBER 20201000171320SCALE IN FEET2040NCONSTRUCTION NOTES1PAVEMENT RECONSTRUCTION PER DETAIL A, THIS SHEET22" MILL AND FILL3PAVER CROSSWALK RECONSTRUCTION PER DETAIL B, THIS SHEET48" WIDE CONCRETE CURB BORDER PER ENG. STD. 73555ADJUST & RESET MONUMENT PER ENG. STD. 90206ADJUST WATER VALVE PER ENG. STD. 63407REMOVE INTERFERING PORTION OF ABANDONED WATERLINE PER ENG. STD. 60508PROTECT (E) DRIVEWAY9PROTECT (E) CULVERT AND PRESTRESSED CONCRETE DECKPAVEMENT RECONSTRUCTIONANOTES·HIGUERA STREET IS PAVED WITH 3" AC OVER 8" PCC·INSTALL TRAVERSE EXPANSION JOINTS WITH SMOOTH DOWELS AT 10' O.C.·INSTALL DOWELS PER ENG. STD. 6020, NOTE 7·3" AC TO BE CONSTRUCTED BY PLACING 1" THICK AC LEVELING COURSE (3/8" AGGREGATE), PAVING GRID (GLASGRID 8502,STARGRID G-PS 200-100 OR APPROVED EQUAL), AND 2" AC THICK SURFACE COURSE (1/2" AGGREGATE).·INSTALL TRIAXIAL GEOGRID (TENSAR TX 140 OR APPROVED EQUAL) AT THE BOTTOM OF THE CLASS 2 BASE.·MATCH EXISTING GRADES AND MAINTAIN UNIFORM CROSS SLOPECLASS 2 AB (95% COMPACTION)OR ONE SACK SLURRY (VIBRATE)3 FEET MINIMUM DEPTHCIVILR EGISTER
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IA No. C 84733HAI-
L
ONG Q. NGUYENRE-COMPACT SUBGRADE90% COMPACTIONSAN LUIS CREEK CULVERTPROTECT IN PLACEPAVEMENTRECONSTRUCTIONLEGENDPAVEMENT RECONSTRUCTIONPER DETAIL A, THIS SHEET2" MILL AND FILLSAN LUIS CREEK CULVERTPROTECT IN PLACEPAVER CROSSWALK RECONSTRUCTIONPER DETAIL B, THIS SHEETPAVER CROSSWALK RECONSTRUCTIONBNOTES·RESET (E) PAVERS AND MATCH EXISTING PATTERN.·REPLACE BROKEN PAVERS IN KIND.·INSTALL DOWELS PER ENG. STD. 7355, NOTE 7PAVER CROSSWALKPER ENG. STD. 7355RE-COMPACT SUBGRADE90% COMPACTIONSAN LUIS CREEK CULVERTPROTECT IN PLACEPAVERCROSSWALKCLASS 2 AB (95% COMPACTION)OR ONE SACK SLURRY (VIBRATE)3 FEET MINIMUM DEPTHTEE CUT ONE FOOTBEYOND EACH SIDE3" AC OVER 9" PCCPER ENG. STD. 6020TRIAXIAL GEOGRIDTRIAXIAL GEOGRIDPAVING GRID
HIGUERA STOSOS STCOURT STBIKE BUFFER PERDETAIL A (159 LF)BIKE SYMBOL PERCALTRANS STANDARDDASHED BIKE LANE PERDETAIL B (45 LF)LEFT TURN BIKE BOXPER DETAIL CDETAIL 9 (159 LF)BANANA REPUBLIC990 HIGUERAABERCROMBIE & FITCH980HIGUERAUNION BANK995 HIGUERAPEET'S COFFEE1075 COURTFIRESTONE GRILL1001 HIGUERAWOODSTOCK'S PIZZA1000 HIGUERA6" WHITE STRIPE, TYP.THROUGH TRAFFIC15' O.C.4" WHITE STRIPE@ 45°, TYP.2.0'BIKE LANE BUFFERADETAIL 39A PERCALTRANS STD.GREEN BIKE LANETRAFFIC-RATEDPAINT PER PROJECTSPECIAL PROVISIONS4.0'6.5'8.0'DASHED GREEN BIKE LANEB4" WHITE STRIPE (29 LF)8" WHITE STRIPE (15 LF)WHITE TYPE IV LEFT TURNARROW PER CALTRANS STD.AT HALF SIZE (7.5 SQFT)WHITE BIKE LANE SYMBOL WITHOUTPERSON PER CALTRANS STD. (7 SQFT)GREEN BIKE LANETRAFFIC-RATED PAINT PERPROJECT SPECIALPROVISIONS (70 SQFT)21.0'VARIES, MIN 10' TYP.LEFT-TURN BIKE BOXCCITY SPECIFICATION NO.DATE:PROJECT TITLE:
SHEET TITLE:ofSHEET NO.DESIGNED BY:DRAWN BY:CHECKED BY:APPROVED BY:SCALE:PLAN FILE NO. / LOCATIONHIGUERA STREET PAVING
1" = 20'STRIPING PLANHNHNMG/BNMHOCTOBER 20201000171330SCALE IN FEET2040NCIVILR EGISTER
E
D
PROFESSIONAL ENGINEERSTATE OF CALI
FORN
IA No. C 84733HAI-
L
ONG Q. NGUYEN
A RCHAEOLOGICAL M ONITORING P LAN
A UGUST 2020
H IGUERA S TREET P AVING P ROJECT
S AN L UIS O BISPO, C ALIFORNIA
\\slo10\projects\CBZ1801.05 Higuera Street Paving MP\Monitoring Plan\Monitoring Plan_Higuera Street Paving_final.docx (08/20/20)
APPENDIX C
RECORD SEARCH RESULTS
8/3/2020 Records Search # 20-158 Kerrie Collison LSA 285 South Street, Suite P San Luis Obispo, CA 93401 Re: Higuera Street Paving (CBZ1801.05) The Central Coast Information Center received your record search request for the project area referenced above, located on the San Luis Obispo USGS 7.5’ quad(s). The following reflects the results of the records search for the project area and a one-quarter mile radius: As indicated on the data request form, the locations of reports and resources are provided in the following format: ◼ custom GIS maps ☐ shapefiles ☐ hand-drawn maps ☐ none Resources within project area: P-40-002287, P-40-001262 Resources within one-quarter mile radius: 124, see maps and bibliography
Reports within project area: SL-00434, SL-00719, SL-02651, SL-05333, SL-05938 Reports within one-quarter mile radius: 72, see maps and bibliography
Resource Database Printout (list): ☐ enclosed ◼ not requested ☐ nothing listed
Resource Database Printout (details): ◼ enclosed ☐ not requested ☐ nothing listed
Resource Digital Database Records: ☐ enclosed ◼ not requested ☐ nothing listed
Report Database Printout (list): ☐ enclosed ◼ not requested ☐ nothing listed
Report Database Printout (details): ◼ enclosed ☐ not requested ☐ nothing listed
Report Digital Database Records: ☐ enclosed ◼ not requested ☐ nothing listed
Resource Record Copies: ◼ enclosed ☐ not requested ☐ nothing listed
Report Copies: ☐ enclosed ◼ not requested ☐ nothing listed
OHP Historic Properties Directory: ☐ enclosed ◼ not requested ☐ nothing listed
Archaeological Determinations of Eligibility: ☐ enclosed ☐ not requested ◼ nothing listed The following sources of information are available at http://ohp.parks.ca.gov/?page_id=28065. Some of these resources used to be available through the CHRIS but because they are now online, they can be accessed directly. The Office of Historic Preservation makes no guarantees about the availability, completeness, or accuracy of the information provided through the sources listed below.
California State Lands Commission Shipwreck Database Caltrans Historic Bridge Inventory
U.S. Geological Survey Historic Topographic Maps Rancho Plat Maps
National Park Service National Register of Historic
Places Nominations
Natural Resource Conservation Service
Soil Survey Maps
US Bureau of Land Management General Land Office
Records
California Historical Landmarks Listing
(by county)
Five Views: An Ethnic Historic Site Survey for California
(1988)
Historical Soil Survey Maps
Please forward a copy of any resulting reports from this project to the office as soon as possible. Due to the sensitive nature of archaeological site location data, we ask that you do not include resource location maps and resource location descriptions in your report if the report is for public distribution. If you have any questions regarding the results presented herein, please contact the office at the phone number listed above. The provision of California Historical Resources Information System (CHRIS) data via this records search response does not in any way constitute public disclosure of records otherwise exempt from disclosure under the California Public Records Act or any other law, including, but not limited to, records related to archeological site information maintained by or on behalf of, or in the possession of, the State of California, Department of Parks and Recreation, State Historic Preservation Officer, Office of Historic Preservation, or the State Historical Resources Commission. Due to processing delays and other factors, not all of the historical resource reports and resource records that have been submitted to the Office of Historic Preservation are available via this records search. Additional information may be available through the federal, state, and local agencies that produced or paid for historical resource management work in the search area. Additionally, Native American tribes have historical resource information not in the CHRIS Inventory, and you should contact the California Native American Heritage Commission for information on local/regional tribal contacts. Should you require any additional information for the above referenced project, reference the record search number listed above when making inquiries. Requests made after initial invoicing will result in the preparation of a separate invoice. Thank you for using the CHRIS. Sincerely, Brian Barbier Coordinator
SL-06357
SL-06361
SL-05218
SL-06905
SL-03496
SL-03731
SL-02948
SL-03144
SL-05337
SL-04164
SL-05162
SL-05162
SL-05414
SL-05938 SL-05938
SL-05656
SL-05738
SL-05513
SL-04929
SL-04212
SL-04534
SL-04563
SL-06191
SL-06182
SL-06151
SL-06404
SL-00483
SL-01304
SL-02079
SL-03739
SL-04978
SL-04573
SL-05924
SL-05737
SL-06893
SL-06605
SL-07367
SL-07510 SL-07520
SL-05638
SL-00434
SL-00434
SL-00434
SL-00434
Higuera Street Paving (CBZ1801.05)
Customer Name: Kerrie Collison - LSA
Project Location: San Luis Obispo
Reports Map 1 of 7
Central Coast Information Center
Department of Anthropology
University of California
Santa Barbara, CA 93106-3210
(805) 893-2474
(805) 893-8707 FAX¤
0 80 160 240 32040Meters
Project Location
One-Quarter Mile Radius
SL-02651
Higuera Street Paving (CBZ1801.05)
Customer Name: Kerrie Collison - LSA
Project Location: San Luis Obispo
Reports Map 2 of 7
Central Coast Information Center
Department of Anthropology
University of California
Santa Barbara, CA 93106-3210
(805) 893-2474
(805) 893-8707 FAX¤
0 130 260 390 52065Meters
Project Location
One-Quarter Mile Radius
SL-00719
SL-03554
SL-07078
SL-07078
SL-07078 SL-07074 SL-05961
SL-05676
SL-05943 SL-05788
SL-07056
SL-05442
Higuera Street Paving (CBZ1801.05)
Customer Name: Kerrie Collison - LSA
Project Location: San Luis Obispo
Reports Map 3 of 7
Central Coast Information Center
Department of Anthropology
University of California
Santa Barbara, CA 93106-3210
(805) 893-2474
(805) 893-8707 FAX¤
0 80 160 240 32040Meters
Project Location
One-Quarter Mile Radius
!.
!.!.
!.!.
!.
!.
!.!.
!.!.
!.SL-05442
SL-03765SL-03765
SL-05960
SL-05960
SL-01244
SL-03782
SL-06159 SL-06156
SL-03441SL-04575
SL-06167 SL-00720[approx loc]SL-07134
SL-03716
SL-05033
SL-05033
SL-05033
SL-05033
Higuera Street Paving (CBZ1801.05)
Customer Name: Kerrie Collison - LSA
Project Location: San Luis Obispo
Reports Map 4 of 7
Central Coast Information Center
Department of Anthropology
University of California
Santa Barbara, CA 93106-3210
(805) 893-2474
(805) 893-8707 FAX¤
0 80 160 240 32040Meters
Project Location
One-Quarter Mile Radius
SL-05333[approx loc]
Higuera Street Paving (CBZ1801.05)
Customer Name: Kerrie Collison - LSA
Project Location: San Luis Obispo
Reports Map 5 of 7
Central Coast Information Center
Department of Anthropology
University of California
Santa Barbara, CA 93106-3210
(805) 893-2474
(805) 893-8707 FAX¤
0 80 160 240 32040Meters
Project Location
One-Quarter Mile Radius
SL-06200[approx loc]
SL-04071[approx loc]
SL-06651[approx loc]SL-02708[approx loc]
SL-02771[approx loc]
SL-02771[approx loc]
SL-03584[approx loc]
SL-04859[approx loc]
Higuera Street Paving (CBZ1801.05)
Customer Name: Kerrie Collison - LSA
Project Location: San Luis Obispo
Reports Map 6 of 7
Central Coast Information Center
Department of Anthropology
University of California
Santa Barbara, CA 93106-3210
(805) 893-2474
(805) 893-8707 FAX¤
0 80 160 240 32040Meters
Project Location
One-Quarter Mile Radius
SL-01683
S
L-0
38
47
SL-05249S
L-05249
S
L-05249 SL-05797S
L-0
57
97
S
L-0
39
34
S
L-0
52
4
9
S
L-0
52
49
S
L-05249
SL-05249SL-05249S
L-0
3922
S
L-0
39
22
S
L-0
39
2
2
S
L-0
39
22
S
L-0
39
22
S
L-0
39
3
4SL-03934S
L-03934 SL-03934SL-03934Higuera Street Paving (CBZ1801.05)
Customer Name: Kerrie Collison - LSA
Project Location: San Luis Obispo
Reports Map 7 of 7
Central Coast Information Center
Department of Anthropology
University of California
Santa Barbara, CA 93106-3210
(805) 893-2474
(805) 893-8707 FAX¤
0 80 160 240 32040Meters
Project Location
One-Quarter Mile Radius
P-40-000030
P-40-001424
P-40-002341
P-40-000891
P-40-002147
P-40-001262
P-40-002287
Higuera Street Paving (CBZ1801.05)
Customer Name: Kerrie Collison - LSA
Project Location: San Luis Obispo
Archaeological Resources Map 1 of 2
Central Coast Information Center
Department of Anthropology
University of California
Santa Barbara, CA 93106-3210
(805) 893-2474
(805) 893-8707 FAX¤
0 80 160 240 32040Meters
Project Location
One-Quarter Mile Radius
P-40-001419[approx loc]
P-40-001419[approx loc]
P-40-000064
P-40-001890
P-40-002206
Higuera Street Paving (CBZ1801.05)
Customer Name: Kerrie Collison - LSA
Project Location: San Luis Obispo
Archaeological Resources Map 2 of 2
Central Coast Information Center
Department of Anthropology
University of California
Santa Barbara, CA 93106-3210
(805) 893-2474
(805) 893-8707 FAX¤
0 80 160 240 32040Meters
Project Location
One-Quarter Mile Radius
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
P-40-040652
P-40-040657
P-40-040859
P-40-040900
P-40-040901
P-40-040910
P-40-040915
P-40-040916
P-40-040918
P-40-040922
P-40-040947
P-40-040949
P-40-040959
P-40-040013
P-40-040019
P-40-040026P-40-040032
P-40-040046
P-40-040048
P-40-040115
P-40-040124
P-40-040128
P-40-040134
P-40-040135
P-40-040142
P-40-040145
P-40-040147
P-40-040152
P-40-040173
P-40-040180
P-40-040041
P-40-041238
P-40-041091
P-40-041099
P-40-041102
Higuera Street Paving (CBZ1801.05)
Customer Name: Kerrie Collison - LSA
Project Location: San Luis Obispo
Built-Environment Resources Map 1 of 4
Central Coast Information Center
Department of Anthropology
University of California
Santa Barbara, CA 93106-3210
(805) 893-2474
(805) 893-8707 FAX¤
0 80 160 240 32040Meters
Project Location
One-Quarter Mile Radius
!.
!.!.!.
!.!.
!.
!.
!.
!.
!.
!.!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.!.
!.
!.
!.
!.
!.
!.
!.
!.
P-40-040012
P-40-040016 P-40-040017P-40-040018
P-40-040021 P-40-040024
P-40-040028P-40-040031
P-40-040039
P-40-040040 P-40-040043
P-40-040044P-40-040045
P-40-040050
P-40-040071
P-40-040114
P-40-040116
P-40-040127
P-40-040144
P-40-040146
P-40-040149
P-40-040150
P-40-040153
P-40-040158
P-40-040166
P-40-040168
P-40-040174
P-40-040175
P-40-040181
P-40-040908
P-40-040914
P-40-040946
P-40-040948
P-40-040952
P-40-041088 P-40-041098
P-40-041233
P-40-040907
P-40-040036
P-40-040917
P-40-040015
P-40-040172
P-40-040167
P-40-040037
Higuera Street Paving (CBZ1801.05)
Customer Name: Kerrie Collison - LSA
Project Location: San Luis Obispo
Built-Environment Resources Map 2 of 4
Central Coast Information Center
Department of Anthropology
University of California
Santa Barbara, CA 93106-3210
(805) 893-2474
(805) 893-8707 FAX¤
0 80 160 240 32040Meters
Project Location
One-Quarter Mile Radius
!.
!.
!.
!.
!.
!.
!.
!.
!.
!.!.
!.
!.
!.
P-40-040038
P-40-040951
P-40-040053
P-40-040033
P-40-040023
P-40-040025
P-40-040020 P-40-040126
P-40-040909
P-40-040151P-40-040047
P-40-041235 P-40-041089
P-40-040921
Higuera Street Paving (CBZ1801.05)
Customer Name: Kerrie Collison - LSA
Project Location: San Luis Obispo
Built-Environment Resources Map 3 of 4
Central Coast Information Center
Department of Anthropology
University of California
Santa Barbara, CA 93106-3210
(805) 893-2474
(805) 893-8707 FAX¤
0 80 160 240 32040Meters
Project Location
One-Quarter Mile Radius
!.
!.
!.
!.!.
!.
!.
!.
!.
!.
!.
!.
!.!.
!.
!.
!.
!.
!.
!.
!.
P-40-040960
P-40-040950
P-40-040958
P-40-040052
P-40-041234P-40-040051 P-40-040042
P-40-041092
P-40-040133
P-40-040014
P-40-040034
P-40-040920
P-40-040919
P-40-040125
P-40-040143
P-40-040148
P-40-040049
P-40-041090
P-40-040022 P-40-040027
P-40-040980
P-40-040982
P-40-040172
Higuera Street Paving (CBZ1801.05)
Customer Name: Kerrie Collison - LSA
Project Location: San Luis Obispo
Built-Environment Resources Map 4 of 4
Central Coast Information Center
Department of Anthropology
University of California
Santa Barbara, CA 93106-3210
(805) 893-2474
(805) 893-8707 FAX¤
0 80 160 240 32040Meters
Project Location
One-Quarter Mile Radius
APPENDIX
APPENDIX
4
APPENDIX C – GEOTECHNICAL REPORT
June 15, 2020
FILE NO.: 303859-001
Mr. Lyle Nemeth
City of San Luis Obispo Public Works Department
919 Palm Street
San Luis Obispo, CA 93401
PROJECT: HIGUERA STREET CULVERT INVESTIGATION
HIGUERA STREET
SAN LUIS OBISPO, CALIFORNIA
SUBJECT: Geotechnical Subsurface Investigation
Dear Mr. Nemeth:
Per your request, we have performed geotechnical subsurface exploration adjacent to the
Higuera Street Culvert near the intersection of Osos Street and Higuera Street. We understand
the asphalt concrete (AC) pavement surface adjacent to the culvert has dropped relative to the
asphalt surface atop the culvert over a roughly two-month period.
We understand the culvert runs in Higuera Street for approximately 250 feet to a point
approximately 150 feet southwest of Osos Street where the culvert turns to the northwest and
continues under the adjacent buildings. While we have not seen the plans for the culvert, we
understand it extends approximately 15 feet below grade, starting with its roof only a few inches
below the asphalt surface. We further understand that the culvert was structurally retrofitted
approximately 20 years ago including an excavation operation which extended a few feet from
the edge of the walls.
FIELD INVESTIGATION AND LABORATORY TESTING
On Thursday, April 30, 2020, three potholes were excavated by D-Kal Construction adjacent to
the culvert. The potholes ranged in depth from 1.5 feet to 5 feet below the pavement surface.
An unidentified conduit was exposed in two of the potholes running immediately adjacent to the
culvert. The road section exposed in the potholes adjacent to the culvert consisted of a few
inches of AC over approximately 10-12 inches of Portland cement concrete (PCC). The soils below
the PCC consisted of fill, including cobbles and brick debris. The undersigned used a T-handle
utility spike probe to attempt to determine variations in soil co nsistency in the potholes. In the
deeper potholes, the backfill against the culvert was less stiff than the soil on the other side of
the pothole. There were a few areas where voids up to 6 inches were exposed below the PCC;
the voids extended up to 3 feet laterally. The largest void was on the side of the pothole furthest
from the culvert.
Based upon this initial exploration, it was discussed on site with City staff that further exploration
would be beneficial. We recommended borings adjacent to the culvert to determine if the
consistency of the backfill varies with depth and distance from the culvert.
Higuera Street Culvert Investigation 2 June 15, 2020
San Luis Obispo, California
Five exploratory borings were drilled at the site on May 13, 2020. The AC and concrete pavement
were removed by D-Kal Engineering. The borings were drilled with a truck-mounted Mobile
Model B-53 drill rig equipped with a 6-inch outside diameter hollow stem auger. As the borings
were drilled, Standard Penetration Tests (SPT) (ASTM D 1586-11) using a 2-inch outside diameter
sampler were also performed starting at 3.0 feet. They were repeated to the termination of each
boring at 18-inch intervals to the terminus of the borings at 15.0 or 18.0. The borings were
backfilled with soil cuttings and the road surface patched by D-Kal Engineering. The approximate
locations of the borings are shown on the attached Exploration Location Map.
The soils encountered in the borings were categorized and logged in general accordance with the
Unified Soil Classification System and ASTM D 2488-17. The consistencies were relatively
consistent across all the borings drilled. The blow counts in blows per foot (bpf) over the last 12
inches of each 18-inch test generally ranged from 3 to 9 bpf.
ANALYSIS AND RECOMMENDATIONS
Based upon the subsurface conditions encountered and our observations, the fill in the area
explored appears to be relatively loose for the full depth of the fill and did not significantly vary
with distance from the culvert. Further, the voids beneath the existing concrete road were not
concentrated adjacent to the culvert but were random where they were observed in the
potholes. While the blow counts through the fill were relatively consistent, t he upper 6 feet did
not exceed 6 bpf.
It appears the concrete and AC roadway section had been spanning across the loose fill and voids,
delaying apparent settlement until recently. However, the settlement that was recently observed
is adjacent to the culvert which is supported on micro-piles driven into the bedrock. It is possible
that the road surface has uniformly settled across the width of the street. However, because the
culvert is supported by bedrock, the settlement of the street relative to the cu lvert has become
noticeable. While the settlement of the road surface may have occurred across the width of the
road, it is the settlement relative to the culvert which is supported on the bedrock that is most
easily noticeable.
Based upon the exploration performed, to fully mitigate the settlement potential, complete
removal of the old fill, down the bedrock and replacement with a material with minimal
settlement potential would be required. However, we anticipate this may be cost prohibitive.
Another option is to perform injection grouting to densify the fill and reduce the settlement
potential. This would also require recompaction the upper soil layers. Another option that may
be most cost effective and provide a reasonable level of service, is to reconstruct the upper few
feet of the fill with properly compacted fill and reconstruct the road surface. This could also be
done in stages or across the entire road width. The most economic method would be to
reconstruct the center lane and area adjacent to the culvert. If funding allows, the reconstruction
could extend to the width of the original fill or that portion of the road could be reconstructed in
the future.
Higuera Street Culvert Investigation 3 June 15, 2020
San Luis Obispo, California
We recommend the minimum depth of reconstruction start with removal of the upper three feet.
The exposed soil surface should them be moisture conditioned and recompacted to a minimum
of 90 percent of maximum relative compaction. Following recompaction, moisture conditioned
non-expansive fill should be placed in 8-inch loose lifts and compacted to 95 percent of maximum
relative compaction. The upper 12 inches, minimum, below basegrade should consist of Class II
aggregate Base. We recommend a minimum of 9 inches of unreinforced concrete overlain by a
minimum of 3 inches of hot mix asphalt. Further, we recommend the concrete have a minimum
flexure strength (per ASTM C78) of 600 psi at 28 days and at least 550 psi prior to any traffic. The
pavement sections were calculated in accordance with the Caltrans Highway Design Manual.
Normal Caltrans construction tolerances should apply. The calculated AB and HMA thicknesses
are for compacted material. Subgrade and aggregate base should be firm and unyielding when
proofrolled with heavy, rubber-tire grading equipment prior to continuing construction.
Due to the presence of older building in the immediate proximity, it is recommended that the
contractor be prepared to meet the compaction recommendations using non-vibratory methods.
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 us.
Sincerely,
Earth Systems Pacific
Robert Down, PE
Associate Engineer
Attachments: Exploration Location Map (1 sheet)
Laboratory Test Results (4 pages)
Doc. No.: 2006-066.LTR/cr
NOT TO SCALELEGENDB14378 Old Santa Fe Road, San Luis Obispo, CA 93401www.earthsystems.com(805) 544-3276 Fax (805) 544-1786DateJune 2020Project No.303859-001Figure 1Boring Location (Approx.)EXPLORATION LOCATION MAPHiguera Street CulvertHiguera StreetSan Luis Obispo, CaliforniaBASE MAP PROVIDED BY: Google EarthB1B2B4B3B5
DEPTH(feet)USCS CLASSSYMBOLINTERVAL(feet)SAMPLETYPEDRY DENSITY(pcf)MOISTURE(%)BLOWSPER 6 IN.SAMPLE DATA
SOIL DESCRIPTION
PAGE 1 OF 1
Boring No. 1
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.
CITY OF SAN LUIS OBISPO
HIGUERA STREET CULVERT
Higuera Street
San Luis Obispo, California
JOB NO.: 303859-001
DATE: 05/13/20AUGER TYPE: 6" Hollow Stem
DRILL RIG: Mobile B-53 with Automatic Hammer
LOGGED BY: R. Mettler
3.0 - 4.5 2
3
2
End of Boring @ 18.0'
No subsurface water encountered
POORLY GRADED SAND: brown, loose, moist
(Fill)
SP
4.5 - 6.0 3
1
3
6.0 - 7.5 2
2
3
7.5 - 9.0 3
1
4
9.0 - 10.5 3
2
4
10.5 - 12.0 3
2
3
12.0 - 13.5 3
1
4
13.5 - 15.0 3
Push
4
15.0 - 16.5 2
2
2
16.5 - 18.0 3
3
4
SANDY LEAN CLAY WITH GRAVEL: brown, soft,
moist, fine sands, fine to coarse gravel
CL
medium stiff, more sand, less gravel
FAT CLAY WITH GRAVEL: dark brown, medium
stiff, moist, some fine sands, fine to coarse gravel
CH
SANDY LEAN CLAY WITH GRAVEL: brown,
medium stiff, moist, fine to medium sands, fine to
coarse gravel, layers of fat clay interlaid with the
lean clay
CL
DEPTH(feet)USCS CLASSSYMBOLINTERVAL(feet)SAMPLETYPEDRY DENSITY(pcf)MOISTURE(%)BLOWSPER 6 IN.SAMPLE DATA
SOIL DESCRIPTION
PAGE 1 OF 1
Boring No. 2
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.
CITY OF SAN LUIS OBISPO
HIGUERA STREET CULVERT
Higuera Street
San Luis Obispo, California
JOB NO.: 303859-001
DATE: 05/13/20AUGER TYPE: 6" Hollow Stem
DRILL RIG: Mobile B-53 with Automatic Hammer
LOGGED BY: R. Mettler
3.0" AC / 8" PCC
3.0 - 4.5 2
2
3
End of Boring @ 15.0'
No subsurface water encountered
LEAN CLAY WITH SAND AND GRAVEL: dark
brown, medium stiff, moist, fine sand, fine to
coarse gravel, brick pieces (Fill)
CL
4.5 - 6.0 3
2
3
6.0 - 7.5 3
3
3
7.5 - 9.0 3
3
3
9.0 - 10.5 3
3
3
10.5 - 12.0 3
2
3
12.0 - 13.5 3
2
4
13.5 - 15.0 3
3
6
SANDY LEAN CLAY WITH GRAVEL: brown,
medium stiff, moist, fine sands, fine to coarse
gravel
CL
yellow brown, slightly moist
brown
DEPTH(feet)USCS CLASSSYMBOLINTERVAL(feet)SAMPLETYPEDRY DENSITY(pcf)MOISTURE(%)BLOWSPER 6 IN.SAMPLE DATA
SOIL DESCRIPTION
PAGE 1 OF 1
Boring No. 3
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.
CITY OF SAN LUIS OBISPO
HIGUERA STREET CULVERT
Higuera Street
San Luis Obispo, California
JOB NO.: 303859-001
DATE: 05/13/20AUGER TYPE: 6" Hollow Stem
DRILL RIG: Mobile B-53 with Automatic Hammer
LOGGED BY: R. Mettler
3.0 - 4.5 2
2
2
End of Boring @ 15.0'
No subsurface water encountered
POORLY GRADED SAND: light brown, loose,
moist (Fill)
SP
4.5 - 6.0 2
1
2
6.0 - 7.5 2
2
3
7.5 - 9.0 3
3
4
9.0 - 10.5 2
2
3
10.5 - 12.0 2
2
3
12.0 - 13.5 3
1
8
13.5 - 15.0 4
3
6
LEAN CLAY WITH SAND AND GRAVEL: dark
brown, soft, moist, fine sands, fine to coarse
gravel
CL
medium stiff, brown
yellow brown
DEPTH(feet)USCS CLASSSYMBOLINTERVAL(feet)SAMPLETYPEDRY DENSITY(pcf)MOISTURE(%)BLOWSPER 6 IN.SAMPLE DATA
SOIL DESCRIPTION
PAGE 1 OF 1
Boring No. 4
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.
CITY OF SAN LUIS OBISPO
HIGUERA STREET CULVERT
Higuera Street
San Luis Obispo, California
JOB NO.: 303859-001
DATE: 05/13/20AUGER TYPE: 6" Hollow Stem
DRILL RIG: Mobile B-53 with Automatic Hammer
LOGGED BY: R. Mettler
3.0" AC / 8" PCC
5.0 - 6.5 2
1
3
End of Boring @ 15.5'
No subsurface water encountered
POORLY GRADED SAND: brown, loose, moist
(Fill)
SP
6.5 - 8.0 2
1
3
8.0 - 9.5 3
2
4
9.5 - 11.0 4
4
4
11.0 - 12.5 3
2
4
12.5 - 14.0 2
2
6
14.0 - 15.5 5
9
6
LEAN CLAY WITH SAND AND GRAVEL: brown,
medium stiff, moist, fine sands, fine to coarse
gravel
CL
yellow brown, cobbles
DEPTH(feet)USCS CLASSSYMBOLINTERVAL(feet)SAMPLETYPEDRY DENSITY(pcf)MOISTURE(%)BLOWSPER 6 IN.SAMPLE DATA
SOIL DESCRIPTION
PAGE 1 OF 1
Boring No. 5
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.
CITY OF SAN LUIS OBISPO
HIGUERA STREET CULVERT
Higuera Street
San Luis Obispo, California
JOB NO.: 303859-001
DATE: 05/13/20AUGER TYPE: 6" Hollow Stem
DRILL RIG: Mobile B-53 with Automatic Hammer
LOGGED BY: R. Mettler
3.0 - 4.5 2
1
1
End of Boring @ 15.0'
No subsurface water encountered
LEAN CLAY WITH SAND AND GRAVEL: dark
brown, soft, moist, fine sands, fine to coarse
gravel, bricks (Fill)
CL
4.5 - 6.0 2
1
2
6.0 - 7.5 4
3
3
7.5 - 9.0 2
2
2
9.0 - 10.5 4
2
5
10.5 - 12.0 3
2
4
12.0 - 13.5 3
3
3
13.5 - 15.0 3
4
6
SANDY LEAN CLAY WITH GRAVEL: dark brown,
medium stiff, moist, fine to medium sands, fine to
coarse gravel
3.0" AC / 8" PCC
CLAYEY SAND WITH GRAVEL: light brown,
loose, slightly moist, fine to medium sands,
medium to coarse gravel
SC
SANDY LEAN CLAY WITH GRAVEL: brown,
medium stiff, moist, fine sands, fine to coarse
gravel
CLAYEY SAND WITH GRAVEL: brown, loose,
slightly moist, fine to medium sands, fine to
coarse gravel
CL
SC