Addendum 2 - STSL Unit 2 Phase 5-2 Liner Construction Project.pdf

SAN BERNARDINO COUNTY

SOLID WASTE MANAGEMENT DIVISION

222 West Hospitality Lane, 2nd Floor San Bernardino, CA 92415-0017

ADDENDUM NO. 2

TO THE PLANS AND BID DOCUMENTS FOR THE UNIT 2 PHASE 5-2 LINER

CONSTRUCTION PROJECT

AT THE SAN TIMOTEO SANITARY LANDFILL

in Redlands, California

September 9, 2026

BID OPEN: 10:00AM SEPTEMBER 17, 2026

BID OPEN: 10:00AM SEPTEMBER 22, 2026

The following changes and/or additions shall be made to the Plans and Bid Documents for the Unit 2 Phase 5-2 Liner Construction Project at the San Timoteo Sanitary Landfill.

All other requirements of the Plans and Bid Documents shall remain the same.

The following changes shall be made part of the Contract Documents, and the Bidder should acknowledge receipt thereof on the Bid Proposal.

I. GENERAL

There are forthcoming changes that will result in increases and/or decreases to certain bid item quantities. A revised Bid Schedule incorporating all updated quantities will be provided in a subsequent addendum.

II. AMEND THE SPECIAL PROVISIONS AS FOLLOWS:

1. Replace paragraph one on page 1 with the following:

Notice is hereby given that San Bernardino County, Department of Public Works – Solid Waste Management Division on behalf of the Board of Supervisors of San Bernardino County, California will receive sealed bids no later than 10:00 a.m. on Tuesday, September 22, 2026 at the Department of Public Works, Solid Waste Management

Division, 222 W. Hospitality Lane, 2nd Floor, San Bernardino, California, 92415-0017, at which time the bids will be publicly opened and declared for the Unit 2 Phase 5-2 Liner Construction Project at the San Timoteo Sanitary Landfill in Redlands, California.

Bids received after this time will not be considered.

2. BID PROPOSAL CHECKLIST: Delete and replace in its entirety Bid Proposal Checklist and Assembly Pages 3 and 4 with the revised Bid Proposal Checklist and Assembly Pages 3A and 4A included in this Addendum as Attachment 1.

3. Section 01 20 00 - Measurement and Payment: Delete Section 01 20 00 in its entirety and replace it with the revised Section 01 20 00 - Measurement and Payment included in this Addendum as Attachment 2.

4. Section 01 50 00 - Construction Support, Subsection 1.7 Temporary Gas Control During Tie-ins, F. Restoration: Modify Subsection 1.7.F as follows. Deletions are shown using strikethrough, and additions are colored in red and underlined.

F. Restoration

1. After tie in completion, the Contractor shall remove temporary bypass piping, restore all valves to permanent operating alignment, and confirm system vacuum balance. and perform wellfield tuning if required.

2. A post tie in monitoring period of at least 24 hours shall be conducted to confirm stable vacuum, flows, and O₂ levels.

5. Section 31 00 00 - Earthwork, Subsection 3.4 Stockpile: Modify Subsection 3.4 Stockpile as follows. Deletions are shown using strikethrough, and additions are colored in red and underlined.

A. Material generated during excavation operations, or remaining at the conclusion of the work, shall be transported to the designated stockpile(s), unless otherwise authorized by the Engineer, and placed in accordance with the Drawings. The Contractor shall provide daily cover material stockpile to operations as required by the County.

B. Stockpile 3 - Prior to fill placement, those areas to receive fill shall be stripped of vegetation, loose topsoil, deleterious materials, and weathered bedrock.

C. Stockpile 3 - The toe of stockpile fill slopes shall be keyed into competent native materials as per Section 3.1-A.10. Stockpile fills shall be benched into competent materials at vertical intervals of 4 feet.

D. Stockpile 3 - The stockpile material shall be placed in horizontal lifts and compacted in accordance with Table 31 00 00 (B).

E. Prior to stockpiling of any soil material, the Contractor shall complete clearing and grubbing activities within the limits of the stockpile.

F. Stockpiles shall be graded to provide positive drainage at all times.

G. Stockpiles A, B, and C shall have a maximum side slope of 2H:1V and a maximum height of 20 feet.

H. The finished surface of the slopes of all stockpiles shall be track-walked, to minimize soil erosion from wind and/or inclement weather. The Contractor shall also comply with the requirements of the approved erosion control plan.

6. Section 32 00 00 - Miscellaneous Civil Improvements, Subsection 1.2 Submittals Required: Modify Subsection 1.2 Submittals Required as follows. Deletions are shown using strikethrough, and additions are colored in red and underlined.

A. The Contractor shall thoroughly review the Specifications and identify all required project submittals. The submittals listed below are intended as a general summary of the submittal items contained in this Section. This submittal list does not release the Contractor from the responsibility of identifying and providing all information requested.

1. PCC/APC Mix Design

2. Certificates of Compliance for Reinforcing Steel

3. Certificates of Compliance for Welded Wire Mesh

4. Corrugated Dual Wall HDPE and CMP Pipe Certificates of Compliance

a. Dual Wall HDPE Pipe Curved Alignment Plan

5. Shop drawings for anti-vortex device

6. Masonry Materials

7. Gradation for CMB

8. Asphalt Concrete Pavement Mix Designs

9. Certificate of compliance for rip rap and bedding material for piping 10.As-Built Drawings 11.Catalog Cut Sheets for Traffic Striping and Signage 12.Shop drawings and cut sheets for vehicle cover and accessories 13.Catalog Cut Sheets for K-rail 14.Mechanically Stabilized Earth Retaining Wall Materials, including but not limited to:

a. Manufacturers product data sheets

b. Stamped and signed retaining wall design plans and specifications

15.Perimeter Fence Materials, including but not limited to:

a. Concrete for Posts

b. Fence Posts

c. Wire Mesh

d. Barbed Wire

e. Tension Wires, Hardware, and Grounding Materials

16.Manufacturer’s product data sheets for fire water line and fittings 17.Manufacturer's product data sheets for fire hydrants, valves, and thrust blocks 18.Shop drawings for Trailer, including but not limited to:

a. Anchoring Calculations and Cut Sheets

b. Shop drawings for electrical, mechanical, and control systems for trailer

c. Accessible ramps, landings, and stairs

7. Section 32 00 00 – Miscellaneous Civil Improvements, Subsection 2.6 Corrugated HDPE Pipe: Modify Subsection 2.6 Corrugated HDPE Pipe as follows.

Deletions are shown using strikethrough, and additions are colored in red and underlined.

2.6 Corrugated Dual Wall HDPE Pipe

A. Corrugated Dual Wall HDPE Pipe and fittings shall be of the size indicated on the drawings, furnished in accordance with Section 207-18 of the SSPWC.

Pipe shall be installed with watertight joints. The Contractor shall submit manufacturer’s catalog cuts and Certificates of Compliance representative of the HDPE culvert pipe to be used on the project.

B. The Contractor shall submit a plan showing how the curved alignments will be achieved. The plan shall be in compliance with the manufacturer's recommendations and approved by the Engineer.

8. Section 32 00 00 – Miscellaneous Civil Improvements, Subsection 3.2 Corrugated HDPE and CSP Pipe: Modify Subsection 3.2 Corrugated HDPE and CSP Pipe as follow. Deletions are shown using strikethrough, and additions colored in red and underlined.

3.2 Corrugated Dual Wall HDPE and CSP Pipe

A. The pipe shall be installed in accordance with the manufacturer’s recommendations and Section 306-7.7 (Plastic Sewer and Drainage Pipe) and 306-7.6 (Corrugated Metal Pipe) of the SSPWC.

9. Section 32 00 00 – Miscellaneous Civil Improvements, Subsection 3.19 Trailer:

Modify Subsection 3.19 Trailer as follows. Deletions are shown using strikethrough, and additions are colored in red and underlined.

A. Install the trailer on a foundation using anchoring per the manufacturer’s recommendations, including skirting and as shown on the plans.

B. Connect electrical service and water in accordance with the plans and specifications.

III. AMEND THE CONSTRUCTION DRAWING AS FOLLOWS:

1. Delete and replace original Sheets C-101, C-207 and C-403 with the revised Sheets C-101A, C-207A and C-403A included in this Addendum No. 2 as Attachment 3.

1. PROJECT QUESTIONS AND ANSWERS

The following question (s) have been received by the bidders:

Q1. Due to the complexity of the project and the minimal amount of time between the pre-bid meeting and bid opening, please push the bid opening date to 10/1/2026.

A1. The bid opening has been extended to Tuesday, September 22, 2026, at 10:00AM.

Q2. Could you please share with us the list of plan holders for this project?

A2. The plan-holders list for this project is available on E-Pro, Addendum No. 1.

Q3. In the Instructions to Bidders (yellow pages) section XII. Lowest Responsible Bid, paragraph 1 refers to a ‘delivery schedule’ proposed by the bidder that will be taken into consideration by the county. Section XVII. Schedule also refers to the bidder preparing an overall schedule for this project. However, the Bid Proposal Checklist and Assembly (pink pages) makes no reference to this schedule. Please confirm if this is to be submitted at bid time.

A3. Project schedule will be submitted by awarded Bidder prior to the start of construction.

Q4. Would County consider holding an additional job walk?

A4. The County will not hold an additional job walk. Per the project’s bidding documents, attendance at the scheduled pre-bid meeting and job walk is a mandatory requirement.

Q5. We missed the mandatory pre-bid meeting and job walk. We wanted to check whether the bid schedule has been extended and, if so, whether there is any opportunity to still qualify to submit a bid?

A5. Per the project’s bidding documents, attendance at the pre-bid meeting and job walk are mandatory requirements. This requirement cannot be waived. Bidders who did not attend the mandatory pre-bid meeting and job walk are not eligible to submit a bid.

Q6. Please provide detailed information on required perils coverages, limits and deductibles for the Builder’s Risk coverage outlined in the Standard Contract, Section 5.3.2, Subsection E. For example, will earthquake and flood perils coverage be required at the full contract amount, or will a coverage sublimit such as $1,000,000 be acceptable?

A6. The Course of Construction/Installation (Builder’s Risk) Property Insurance shall be based on the Contractor’s proposed bid amount.

Q7. The General Conditions, Section 11.2.1.4, states that projects exceeding $10,000,000 require General Liability and Auto Liability limits of no less than two times the total estimated project cost. This results in a liability limit that is much greater than most general contractors carry. Would the Agency be willing to grant an exception to this requirement for this project?

A7. Per the project’s bidding documents, the insurance requirements specified in the General Conditions, Section 11.2 are mandatory. The County will not grant an exception or waiver to the General Liability and Auto Liability insurance limits required for this project. Bidders are required to comply with the insurance requirements as stated in the project’s bidding documents.

Q8. Please confirm whether subcontractors must be listed in ePro when submitting electronically, or if the List of Subcontractors included in the bid package will satisfy the subcontractor listing requirement.

A8. It is not necessary to list subcontractors separately in ePro. Bidders should list all proposed subcontractors for this project on the List of Subcontractors Form provided in the project’s bidding documents. Bidders are required to complete the form in its entirety and ensure that all requested information is provided as specified on the form. The completed List of Subcontractors Form must be submitted as part of the bid package.

Q9. Is there a minimum self-performance percentage for prime contractors?

A9. The SSPWC, Section 3 – Control of the Work, Subsection 3-2-Self Performance states that Contractor shall perform with its own organization contract work amounting to at least 50 percent of the contract price except that any designated “specialty items” may be performed by subcontract.

Q10. Is this project also referred to as “Liner Construction Unit 2 Phase 5B San Timoteo Sanitary Landfill?”

A10. Unit 2 Phase 5 liner was originally designed and permitted as one construction phase. It was then subsequently divided into two construction phases, identified as Phase 5-1 and Phase 5-2. Phase 5-1 has already been constructed. This project consists of completing the remaining portion of the Unit 2 Phase 5 Liner, which is referred to as Phase 5-2. Any documentation, plans, specifications, or other project information obtained with the title “Liner Construction Unit 2 Phase 5B San Timoteo Sanitary Landfill” may contain outdated or superseded information. Do not use, rely upon, or incorporate any documents bearing this title for bidding purposes.

Q11. Will the County be issuing an operations layer fill grading plan?

A11. A grading plan will not be provided, the requirements for the grading are in the project specifications. See revised Section 31 00 00, Subsection 3.4.

Q12. Will the County be providing an Operational Cover Finish Grading Plan?

A12. Please refer to Question 11 for response.

Q13. For Bid Item 104. SWMD Trailer:

a. Is the county performing the utility connections and hook-ups for water, electrical, sewer?

b. Will the trailer have temporary foundations?

c. Is skirting required?

d. Will the trailer require stairs and an ADA ramp?

A13. All the requirements for the SWMD trailer are contained in the Project Specifications. See revised Section 32 00 00.

Q14. Are there minority goals set for this bid?

A14. There are no minority participation goals established for this bid solicitation.

Q15. The Bid Proposal Checklist and Assembly states "IF SUBMITTING A BID

THROUGH EPRO, SCAN AND ATTACH TO YOUR QUOTE THE FULLY

EXECUTED BID PROPOSAL DOCUMENT - Yellow Page 6". However, Yellow Page 6 is page 2 of the Instructions to Bidders. Please clarify this checklist item.

A15. The Bid Proposal Checklist and Assembly has been revised. For clarification purposes, the ‘yellow page 6’ reference has been removed from the document. Please use the version that is attached with this Addendum when submitting the bid.

Q16. The Performance and Payment bonds are included in the Bid Documents and are typically due post award. Please confirm when the Performance and Payment bonds are due?

A16. Performance Bond and Payment Bond are required to be submitted after award of the contract. Section XVIII of the Instructions to Bidders states the Payment Bond shall be furnished prior to the commencement of work under the contract.

Q17. Please confirm that the Subcontractor Non-Collusion Declaration is due four (4) Working Days after bid opening.

A17. Per the project’s bidding package and requirements, the Subcontractor Non-Collusion Declaration must be submitted with the bid or within four (4) working days after the bid opening.

Q18. Please confirm when the Contractor's Affidavit and Final Release form is due.

A18. The Contractor’s Affidavit and Final Release Form must be submitted following completion of the project and after all outstanding project requirements and obligations have been satisfied and cleared. The completed form is required prior to the release of the project retention and will be part of the documentation required for final payment and closeout.

Q19. Are CARB certs required to be submitted with the bid?

A19. Yes, the CARB certification is one of the required bid submittals and is specifically included in the “Bid Proposal Checklist and Assembly.” As part of the bidding package, both Contractor and Subcontractor CARB Certification Forms are provided and must be properly completed and submitted with the bid. Failure to submit the required CARB Certification Forms, or failure to comply with any of the applicable requirements, may result in the bid being deemed non-responsive

If you have any questions, please contact Jesus Torres at (909) 387-1092 or you may contact me at (909) 386-9017.

Johnny D. Gayman, P.E. Date Engineering Manager

E4635 Johnny Gayman 2024

E4635 Text Box 09/09/2026

ATTACHMENT 1

Bid Proposal Checklist and Assembly

SWMD Bid Docs – 11/14/02 Rev. 11/2/16 3A

BID PROPOSAL CHECKLIST AND ASSEMBLY

IMPORTANT

Failure to Properly Complete Bid Package May Result in Rejection of Bid

CHECK BOX

TITLE AND PAGE(S) IF DONE/SUBMITTED

REGISTERED AS A VENDOR IN THE EPRO SYSTEM PRIOR TO

DATE AND TIME TO RECEIVE BID - Yellow Page 6

IF SUBMITTING BID THROUGH EPRO, ORIGINAL BID SECURITY

SUBMITTED IN A SEPARATE SEALED ENVELOPE LABELED "BID

BOND" WITH THE PROJECT TITLE AND NUMBER AND NAME OF

BIDDER MARKED ON OUTSIDE OF ENVELOPE TO SAN

BERNARDINO COUNTY, DEPARTMENT OF PUBLIC WORKS-SOLID

WASTE MANAGEMENT DIVISION. MUST BE RECEIVED ON OR

BEFORE THE TIME SET FOR THE OPENING OF BIDS. - Yellow Page 6

IF SUBMITTING A BID THROUGH EPRO, SCAN AND ATTACH

TO YOUR QUOTE THE FULLY EXECUTED BID PROPOSAL

DOCUMENT

BIDDER’S QUALIFICATIONS – Yellow Pages 14-16*

BIDDER INFORMATION IS COMPLETE AND CORRECT

BID (Must be signed) – Yellow Pages 17-20*

CORRECTIONS OR CHANGES TO THE BID DOCUMENTS FOR

BIDDER ERRORS ARE INITIALIZED

BID PROPOSAL IS SIGNED BY AUTHORIZED

REPRESENTATIVE - Yellow Page 20

ADDENDA ACKNOWLEDGEMENT – Yellow Page 20*

REPLACEMENT BID SHEETS FOR ADDENDA ARE SUBSTITUTE

IN SEQUENCE, IFAPPLICABLE

BID SCHEDULE – Yellow Pages 21-end*

SWMD Bid Docs – 11/14/02 Rev. 11/2/16 4A

UNIT COST IS ENTERED FOR ALL BID ITEMS

(OR ALTERNATE BID ITEMS)

BID BOND/ SECURITY:*

BID BOND (See Instructions to Bidders) – Yellow Pages 24-25

OR

BID SECURITY (See Instructions to Bidders) – Yellow Page 26

CONTRACTOR’S LICENSING STATEMENT – Yellow Page 28*

LIST OF SUBCONTRACTORS – Yellow Pages 29-30**

NON-COLLUSION DECLARATION FOR PRINCIPAL – Yellow Page 31*

NON-COLLUSION DECLARATION FOR SUBCONTRACTORS –

Yellow Page 32***

PERFORMANCE BOND FORM

Yellow Pages 33-34

LABOR AND MATERIALS BOND FORM

Yellow Pages 35-36

CONTRACTOR’S AFFIDAVIT AND FINAL RELEASE

Yellow Page 37

CARB – CONTRACTOR CERTIFICATION FORM

Yellow Page 40*

CARB – LIST OF SUBCONTRACTORS FORM

Yellow Pages 41-42*

* IF NOT COMPLETED AND SUBMITTED WITH BID, BID WILL BE DECLARED

NONRESPONSIVE

** IF NOT COMPLETED AND SUBMITTED WITH BID, CONTRACTOR IS REQUIRED

TO COMPLETE ALL WORK, EXCEPT AS OTHERWISE PROVIDED IN THE BID

PACKAGE

***MUST BE SUBMITTED NO LATER THAN FOUR WORKING DAYS AFTER BID

OPENING OR BID WILL BE DECLARED NONRESPONSIVE

ATTACHMENT 2

Revised Section 01 20 00

Measurement and Payment

San Timoteo Sanitary Landfill Section 01 20 00 – M & P Unit 2 Phase 5-2 Liner 1 Tetra Tech Q:\Landfills\_San Timoteo\Projects\2023 Unit 2 Phs 5-2 Liner and LCRS Expansion Project\DESIGN_BIDDING\ADVERTISEMENT AND BID\Addendum\Addendum 2\Draft Addendum 2\Attachment 2 - STSL Unit 2 Phase 5-2 Liner Specs - Section 01 20 00_Changes Accepted.docx

SECTION 01 20 00

MEASUREMENT AND PAYMENT

PART 1 - GENERAL

1.1 Measurement and Payment

A. Improvements placed beyond the limits indicated on the drawings will not be compensated unless authorized by the Engineer and County prior to installation.

B. To facilitate progress payments, the Bid Schedule reflects the main elements of the various civil and miscellaneous improvements. Interim compensation will be based on the Engineer’s review and approval of the various components of the work completed during the pay period.

C. Retention will be withheld until final completion of the Work in accordance with the Contract.

1.2 Nonpayment for Rejected or Unused Products

A. Payment will not be made for the following:

1. Loading, hauling, disposing or replacement of rejected, contaminated or damaged material or material which does not meet product Specifications listed in the Contract Documents.

2. Quantities of material wasted or disposed of in manner not called for under Contract Documents.

3. Rejected loads of material, including material rejected after it has been placed by reason of failure of Contractor to conform to provisions of Contract Documents.

4. Material not unloaded from transporting vehicle.

5. Defective work not accepted by the Engineer/CQA Consultant.

6. Material remaining on hand after completion of Work.

1.3 Earthwork Measurement

A. Final pay quantities for Bid Items 9 through 17 will be determined by 1) total excavation volume minus

2) material incorporated into the operations layer and proportioned over 3) fill volumes. The excavation volume will be determined by comparing the volumetric difference between the approved pre-construction topographic survey and the Phase 5-2 subgrade design grades as indicated on the drawings.

1. Excavation Volume Measurement:

a. Phase 5-2 Excavation: Approved pre-construction topographic survey and the Phase 5-2 subgrade design grades.

b. Access Road Excavation: Approved pre-construction topographic survey and the Access Road design grades.

c. Entrance Road Excavation: Approved pre-construction topographic survey and the Entrance Road design grades.

2. Operations Layer Volume Measurement:

a. Operations Layer (24-Inch Thick) Per Detail 1/C-501 (Base): Point-over-point as-built survey volume calculation.

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b. Operations Layer (24-Inch Thick) Per Detail 2/C-501 (Slope): Point-over-point as-built survey volume calculation.

c. Operations Layer Per Detail 8/C-501 (Bench): Point-over-point as-built survey volume calculation.

3. Fill Volume Measurement:

a. Phase 5-2 Unclassified Fill: Approved pre-construction topographic survey and the approved as-built, adjusted per paragraph A.

b. Access Road Unclassified Fill: Approved pre-construction topographic survey and the approved as-built, adjusted per paragraph A.

c. Stockpile 3: Approved pre-construction topographic survey and the approved as-built, adjusted per paragraph A.

d. Stockpile A: Load counts adjusted per paragraph A.

e. Stockpile B: Load counts adjusted per paragraph A.

f. Stockpile C: Load counts adjusted per paragraph A.

g. Operations Layer Access Road Fill: Approved pre-construction topographic survey and the approved as-built, adjusted per paragraph A.

PART 2 - PRODUCTS

NOT USED

PART 3 - EXECUTION

NOT USED

PART 4 - MEASUREMENT AND PAYMENT

4.1 Mobilization/Demobilization

A. Full compensation for all labor, material, and equipment required for mobilization, as represented by the Contract Documents, shall be included in the Contractor’s lump sum price for mobilization.

B. The dollar amount for mobilization, as reflected in the Proposal, shall not exceed 10 percent of the total bid for the Project.

C. Fifty percent of the mobilization bid price, less retention, will be paid on the initial billing provided all equipment and temporary facilities are in place and bond fees paid. Forty percent of the bid price will be paid uniformly, on a monthly basis during the projected life of the Contract. Ten (10) percent of the mobilization bid price will be paid on satisfactory removal of all facilities and equipment upon completion of the project.

4.2 Construction Support

A. Full compensation for all labor, material, and equipment required for compliance with the requirements outlined in Section 01 50 00 Construction Support shall be included in the Contractor’s lump sum price for Construction Support.

B. The lump sum bid price will be paid uniformly, on a monthly basis during the projected life of the Contract.

Unit 2 Phase 5-2 Liner 3 Tetra Tech Q:\Landfills\_San Timoteo\Projects\2023 Unit 2 Phs 5-2 Liner and LCRS Expansion Project\DESIGN_BIDDING\ADVERTISEMENT AND BID\Addendum\Addendum 2\Draft Addendum 2\Attachment 2 - STSL Unit 2 Phase 5-2 Liner Specs - Section 01 20 00_Changes Accepted.docx

4.3 Survey

A. Full compensation for all labor, material, and equipment required for project survey as outlined in these specifications shall be included in the Contractor’s lump sum price for Survey.

B. The lump sum bid price will be paid uniformly, on a monthly basis during the projected life of the Contract.

4.4 Record Drawings

A. Full compensation for all labor, material, and equipment required to produce the record drawings as outlined in these specifications shall be included in the Contractor’s lump sum price for Record Drawings.

B. Final payment to the Contractor will not be made until the Record Drawings have been reviewed and approved by the Engineer.

4.5 Clearing, Grubbing, and Removal/Demolition

A. All clearing and grubbing, removal or demolition of existing surface and sub-surface drainage infrastructure; and/or other operations incidental and required to complete clearing, grubbing, removal, and/or demolition as represented by the Drawings and Specifications shall be considered as included in the Contractor’s price.

B. The final pay quantities will be determined by field verification that the work has been completed in accordance with the drawings and these Specifications. Interim progress payments will be based on the Construction Manager’s evaluation of the estimated percentage of work completed during the subject period.

4.6 Remove and Salvage

A. The contract lump sum price paid for Remove and Salvage shall include full compensation for furnishing all labor, materials, tools, equipment, and incidentals and for doing all work involved as shown on the Drawings, as specified in these Specifications, and as directed by the Engineer.

B. Final pay quantities will be determined by field verification to verify that the work has been completed in accordance with the drawings and these Specifications. Interim progress payments will be based on the Construction Manager’s evaluation of the estimated percentage of work completed during the subject period.

4.7 Asbestos Cement Pipe Abatement

A. The contract lump sum price paid for Asbestos Cement Pipe Abatement shall include full compensation for furnishing all labor, materials, tools, equipment, and incidentals and for doing all work involved including work plans, monitoring, testing, excavation, wetting, engineering controls, transport, disposal, fittings and backfill as shown on the Drawings, as specified in these Specifications, and as directed by the Engineer.

B. Final pay quantities will be determined by field verification to verify that the work has been completed in accordance with the drawings and these Specifications. Interim progress payments will be based on the Construction Manager’s evaluation of the estimated percentage of work completed during the subject period.

4.8 Refuse Excavation and Disposal

A. All refuse excavation and disposal shall include full compensation for all labor, materials, tools, equipment, and incidentals required for completing the work. Excavation and fill beyond the limits indicated on the drawings will be compensated only if the additional

Unit 2 Phase 5-2 Liner 4 Tetra Tech Q:\Landfills\_San Timoteo\Projects\2023 Unit 2 Phs 5-2 Liner and LCRS Expansion Project\DESIGN_BIDDING\ADVERTISEMENT AND BID\Addendum\Addendum 2\Draft Addendum 2\Attachment 2 - STSL Unit 2 Phase 5-2 Liner Specs - Section 01 20 00_Changes Accepted.docx excavation has been requested by the project geologist and/or approved and authorized by the Engineer.

A. The final pay quantities will be determined by load count; load volume (cubic yards) shall be agreed upon prior to start of work. Contractor shall submit signed haul tickets daily.

4.9 Phase 5-2 Excavation to Phase 5-2 Unclassified Fill

A. The contract unit price for Phase 5-2 Excavation to Phase 5-2 Unclassified Fill shall include full compensation for all labor, material, and equipment required for excavation, transport, moisture conditioning, placement, and compaction as indicated on the Drawings, and as specified in the Specifications.

B. Excavation and fill beyond the limits indicated on the drawings will be compensated under the Over Excavate Unsuitable Material and Recompact item only if the additional excavation has been requested by the CQA Consultant and/or approved and authorized by the Engineer.

C. Final pay quantities shall be in accordance with Article 1.3.

4.10 Phase 5-2 Excavation to Access Road Unclassified Fill

A. The contract unit price for Phase 5-2 Excavation to Access Road Unclassified Fill shall include full compensation for all labor, material, and equipment required for excavation, transport, moisture conditioning, placement, and compaction as indicated on the Drawings, and as specified in the Specifications.

B. Excavation and fill beyond the limits indicated on the drawings will be compensated under the Over Excavate Unsuitable Material and Recompact item only if the additional excavation has been requested by the CQA Consultant and/or approved and authorized by the Engineer.

C. Final pay quantities shall be in accordance with Article 1.3.

4.11 Phase 5-2 Excavation to Stockpile 3

A. The contract unit price for Phase 5-2 Excavation to Stockpile 3 shall include full compensation for all labor, material, and equipment required for excavation, transport, moisture conditioning, placement, and compaction as indicated on the Drawings, and as specified in the Specifications.

B. Excavation and fill beyond the limits indicated on the drawings will be compensated under the Over Excavate Unsuitable Material and Recompact item only if the additional excavation has been requested by the CQA Consultant and/or approved and authorized by the Engineer.

C. Final pay quantities shall be in accordance with Article 1.3.

4.12 Phase 5-2 Excavation to Stockpile A (Deletable)

A. The contract unit price for Phase 5-2 Excavation to Stockpile A shall include full compensation for all labor, material, and equipment required including excavation, transport, placement, and compaction as indicated on the Drawings, and as specified in the Specifications.

B. This bid item is partially or fully deletable at the discretion of the County and increases or decreases beyond 25 percent of the estimated quantity will NOT constitute a new negotiated contract unit price.

C. Progress payments will be determined by load count; load volume (cubic yards) shall be agreed upon prior to start of work. Contractor shall submit signed haul tickets daily. Final pay quantities shall be in accordance with Article 1.3.

Unit 2 Phase 5-2 Liner 5 Tetra Tech Q:\Landfills\_San Timoteo\Projects\2023 Unit 2 Phs 5-2 Liner and LCRS Expansion Project\DESIGN_BIDDING\ADVERTISEMENT AND BID\Addendum\Addendum 2\Draft Addendum 2\Attachment 2 - STSL Unit 2 Phase 5-2 Liner Specs - Section 01 20 00_Changes Accepted.docx

4.13 Phase 5-2 Excavation to Stockpile B (Deletable)

A. The contract unit price for Phase 5-2 Excavation to Stockpile B shall include full compensation for all labor, material, and equipment required including excavation, transport, placement, and compaction as indicated on the Drawings, and as specified in the Specifications.

B. This bid item is partially or fully deletable at the discretion of the County and increases or decreases beyond 25 percent of the estimated quantity will NOT constitute a new negotiated contract unit price.

C. Progress payments will be determined by load count; load volume (cubic yards) shall be agreed upon prior to start of work. Contractor shall submit signed haul tickets daily. Final pay quantities shall be in accordance with Article 1.3.

4.14 Phase 5-2 Excavation to Stockpile C (Deletable)

A. The contract unit price for Phase 5-2 Excavation to Stockpile C shall include full compensation for all labor, material, and equipment required including excavation, transport, placement, and compaction as indicated on the Drawings, and as specified in the Specifications.

B. This bid item is partially or fully deletable at the discretion of the County and increases or decreases beyond 25 percent of the estimated quantity will NOT constitute a new negotiated contract unit price.

C. Progress payments will be determined by load count; load volume (cubic yards) shall be agreed upon prior to start of work. Contractor shall submit signed haul tickets daily. Final pay quantities shall be in accordance with Article 1.3.

4.15 Phase 5-2 Excavation to Operations Layer Access Road Fill

A. The contract unit price for Phase 5-2 Excavation to Operations Layer Access Road Fill shall include full compensation for all labor, material, and equipment required including excavation, transport, placement, and compaction as indicated on the Drawings, and as specified in the Specifications.

B. Final pay quantities shall be in accordance with Article 1.3.

4.16 Access Road Excavation to Access Road Unclassified Fill

A. The contract unit price for Access Road Excavation to Access Road Unclassified Fill shall include full compensation for all labor, material, and equipment required for excavation, transport, moisture conditioning, placement, and compaction as indicated on the Drawings, and as specified in the Specifications.

B. Excavation and fill beyond the limits indicated on the drawings will be compensated under the Over Excavate Unsuitable Material and Recompact item only if the additional excavation has been requested by the CQA Consultant and/or approved and authorized by the Engineer.

C. Final pay quantities shall be in accordance with Article 1.3.

4.17 Entrance Road Excavation to Stockpile 3

A. The contract unit price for Entrance Road Excavation to Stockpile 3 shall include full compensation for all labor, material, and equipment required for excavation, transport, placement, and compaction as indicated on the Drawings, and as specified in the Specifications.

Unit 2 Phase 5-2 Liner 6 Tetra Tech Q:\Landfills\_San Timoteo\Projects\2023 Unit 2 Phs 5-2 Liner and LCRS Expansion Project\DESIGN_BIDDING\ADVERTISEMENT AND BID\Addendum\Addendum 2\Draft Addendum 2\Attachment 2 - STSL Unit 2 Phase 5-2 Liner Specs - Section 01 20 00_Changes Accepted.docx

B. Excavation and fill beyond the limits indicated on the drawings will be compensated under the Over Excavate Unsuitable Material and Recompact item only if the additional excavation has been requested by the CQA Consultant and/or approved and authorized by the Engineer.

C. Final pay quantities shall be in accordance with Article 1.3.

4.18 Over-Excavation and Buttress Construction Per Sheet C-101

A. The contract unit price for Over-Excavation and Buttress Construction shall include full compensation for all labor, material, and equipment required for removal below the subgrade, including excavation, benching, transport, moisture conditioning, placement, and compaction as indicated on the Drawings, and as specified in the Specifications.

B. Final pay quantities will be determined by comparing the volumetric difference between a combined surface of the approved pre-construction topographic survey and the design Phase 5-2 Subgrade surface within the Phase 5-2 Buttress Excavation limits as indicated on the drawings, and compared to the Buttress Excavation design surface; less the volume of material incorporated in the unclassified fill within the Phase 5-2 Buttress Excavation Limits as indicated on the drawings.

4.19 Unsuitable Soil Removal and Replacement

A. The contract unit price for Unsuitable Soil Removal and Replacement shall include full compensation for all labor, material, and equipment required for removal of unsuitable materials below the subgrade, including excavation, transport, placement, and compaction as indicated on the Drawings, and as specified in the Specifications.

B. Final pay quantities will be determined by comparing the volumetric difference between the approved preconstruction topography and the topographic surveys of the over excavated areas, conducted by the Contractor, and approved by the Engineer. Excavation beyond the limits approved by the Engineer will not be compensated.

4.20 4-Inch Solid HDPE Subdrain Per Detail 3/C-501

A. The contract unit price paid for Solid HDPE Pipe shall include full compensation for furnishing all labor, materials, tools, equipment, and incidentals and for doing all work involved in installing the piping including all excavation, pipes, bedding, backfill, fittings, and caps and other appurtenances as shown on the Drawings, as specified in these Specifications, and as directed by the Engineer.

B. Final pay quantities shall be determined from the approved Record Drawings indicating the actual linear footage installed to the limits indicated on the Drawings.

4.21 4-Inch Slotted HDPE Subdrain on Flowline Per Detail B Per Detail 2/C-505

A. The contract unit price paid for Slotted HDPE Subdrain shall include full compensation for furnishing all labor, materials, tools, equipment, and incidentals and for doing all work involved in installing the piping including all excavation, pipes, gravel, geotextile, backfill, fittings, and caps and other appurtenances as shown on the Drawings, as specified in these Specifications, and as directed by the Engineer.

B. Final pay quantities shall be determined from the approved Record Drawings indicating the actual linear footage installed to the limits indicated on the Drawings.

4.22 4-Inch Slotted Buttress Backdrain Per Detail A Per Detail 2/C-505

A. The contract unit price paid for Slotted HDPE Backdrain shall include full compensation for furnishing all labor, materials, tools, equipment, and incidentals and for doing all work involved in installing the piping including all excavation, pipes, gravel, geotextile, backfill, Unit 2 Phase 5-2 Liner 7 Tetra Tech Q:\Landfills\_San Timoteo\Projects\2023 Unit 2 Phs 5-2 Liner and LCRS Expansion Project\DESIGN_BIDDING\ADVERTISEMENT AND BID\Addendum\Addendum 2\Draft Addendum 2\Attachment 2 - STSL Unit 2 Phase 5-2 Liner Specs - Section 01 20 00_Changes Accepted.docx fittings, and caps and other appurtenances as shown on the Drawings, as specified in these Specifications, and as directed by the Engineer.

B. Final pay quantities shall be determined from the approved Record Drawings indicating the actual linear footage installed to the limits indicated on the Drawings.

4.23 4-Inch Solid HDPE Subdrain Per Detail B Per Detail 2/C-505

A. The contract unit price paid for Solid HDPE Subdrain shall include full compensation for furnishing all labor, materials, tools, equipment, and incidentals and for doing all work involved in installing the piping including all excavation, pipes, bedding, backfill, fittings, and caps and other appurtenances as shown on the Drawings, as specified in these Specifications, and as directed by the Engineer.

B. Final pay quantities shall be determined from the approved Record Drawings indicating the actual linear footage installed to the limits indicated on the Drawings.

4.24 4-Inch Slotted HDPE Subdrain Per Detail 4/C-507

A. The contract unit price paid for Slotted HDPE Subdrain shall include full compensation for furnishing all labor, materials, tools, equipment, and incidentals and for doing all work involved in installing the piping including all excavation, pipes, bedding, backfill, fittings, and caps and other appurtenances as shown on the Drawings, as specified in these Specifications, and as directed by the Engineer.

B. Final pay quantities shall be determined from the approved Record Drawings indicating the actual linear footage installed to the limits indicated on the Drawings.

4.25 Operations Layer (24” Thick) Per Detail 1/C-501 (Base)

A. The contract unit price for 24-inch-thick Operations Layer soil placement shall include full compensation for all labor, material, and equipment required to process, screen, transport, place, and compact the operations layer soil, as represented by the Contract Documents.

B. Final pay quantities shall be determined by survey of the actual surface area of the operations layer soil placed to the limits indicated on the Drawings, and by point-over-point survey of the material depth.

4.26 8 oz/sy Non-Woven Geotextile Per Detail 1/C-501 (Base)

A. The contract unit price for Geotextile installation on the base shall include full compensation for all labor, materials, and equipment required to furnish and install the Geotextile in accordance with the details and notes shown on the Drawings, and as indicated in the Specifications, and manufacturer’s recommendations.

B. Final pay quantities shall be determined by computing the actual surface area of Geotextile placed to the limits indicated on the Drawings (overlap at seams will not be measured separately for payment, and material in anchor trenches and/or terminations will be considered as included in the respective Bid Item).

4.27 LCRS Gravel (9" Thick) Per Detail 1/C-501 (Base)

A. The contract unit price for LCRS Gravel shall include full compensation for all labor, material, and equipment required to construct the 9-inch-thick LCRS gravel including purchasing, material, import, and placement as shown on the Drawings and Specifications.

B. Final pay quantities shall be determined by survey of the actual square footage of the 9-inch thick LCRS gravel placed to the limits indicated on the Drawings, and by point-over-point survey of the material depth.

Unit 2 Phase 5-2 Liner 8 Tetra Tech Q:\Landfills\_San Timoteo\Projects\2023 Unit 2 Phs 5-2 Liner and LCRS Expansion Project\DESIGN_BIDDING\ADVERTISEMENT AND BID\Addendum\Addendum 2\Draft Addendum 2\Attachment 2 - STSL Unit 2 Phase 5-2 Liner Specs - Section 01 20 00_Changes Accepted.docx

4.28 12 oz/sy Non-Woven Geotextile Per Detail 1/C-501 (Base)

A. The contract unit price for Geotextile installation on the base shall include full compensation for all labor, materials, and equipment required to furnish and install Geotextile in accordance with the details and notes shown on the Drawings, and as indicated in the Specifications, and manufacturer’s recommendations.

B. Final pay quantities shall be determined by computing the actual surface area of Geotextile placed to the limits indicated on the Drawings (overlap at seams will not be measured separately for payment and material in anchor trenches and/or terminations will be considered as included in the respective Bid Item).

4.29 80 mil Double-Sided Textured HDPE Geomembrane Per Detail 1/C-501 (Base)

A. The contract unit price for Geomembrane installation on the floor shall include full compensation for all labor, materials, and equipment required to furnish and install the geomembrane in accordance with the details, and notes shown on the Drawings and as indicated in the specifications, and manufacturer’s recommendations.

B. Final pay quantities shall be determined by computing the actual surface area of Geomembrane placed to the limits indicated on the drawings (overlap at seams will not be measured separately for payment and material in anchor trenches and/or terminations will be considered as included in the respective Bid Item).

4.30 Geosynthetic Clay Liner (GCL) Per Detail 1/C-501 (Base)

A. The contract unit price for GCL installation on the floor shall include full compensation for all labor, materials, and equipment required to furnish and install the GCL in accordance with the details and notes shown on the Drawings, and as indicated in these specifications, and manufacturer’s recommendations.

B. Final pay quantities shall be determined by computing the actual surface area of GCL placed to the limits indicated on the drawings (overlap at seams will not be measured separately for payment and material in anchor trenches and/or terminations will be considered as included in the respective Bid Item).

4.31 60 mil Double-Sided Textured HDPE Geomembrane Per Detail 1/C-501 (Base)

A. The contract unit price for Geomembrane installation on the floor shall include full compensation for all labor, materials, and equipment required to furnish and install the geomembrane in accordance with the details, and notes shown on the Drawings and as indicated in the specifications, and manufacturer’s recommendations.

B. Final pay quantities shall be determined by computing the actual surface area of geomembrane placed to the limits indicated on the drawings (overlap at seams will not be measured separately for payment and material in anchor trenches and/or terminations will be considered as included in the respective Bid Item).

4.32 Low Permeability Layer (LPL) - 12" min. Per Detail 1/C-501 (Base)

A. The contract unit price for Low Permeability Layer shall include full compensation for all labor, material, and equipment required for placement of the low permeability layer, including select excavation, screening, processing, transport, placement, moisture conditioning, compaction, and maintenance as indicated on the Drawings, and as specified in the Specifications.

B. Final pay quantities shall be determined by survey of the actual surface area of low permeability layer constructed to the limits indicated on the Drawings, and by point-over-point survey of the material depth.

Unit 2 Phase 5-2 Liner 9 Tetra Tech Q:\Landfills\_San Timoteo\Projects\2023 Unit 2 Phs 5-2 Liner and LCRS Expansion Project\DESIGN_BIDDING\ADVERTISEMENT AND BID\Addendum\Addendum 2\Draft Addendum 2\Attachment 2 - STSL Unit 2 Phase 5-2 Liner Specs - Section 01 20 00_Changes Accepted.docx

4.33 Engineered Fill (12" min.) Per Detail 1/C-501 (Base)

A. The contract unit price for Engineered Fill shall include full compensation for all labor, materials, tools, equipment, and incidentals required for placement of the engineered fill layer (the 1-foot layer directly under the low permeability layer), including excavation, processing, transport, moisture conditioning, placement, compaction of materials, and maintenance as indicated on the Drawings, and as specified in the Specifications.

B. Final pay quantities shall be determined by survey of the actual surface area of engineered fill layer constructed to the limits indicated on the Drawings, and by point-over-point survey of the material depth.

4.34 16 oz/sy Non-Woven Geotextile Per Detail 2/C-501 (Slope)

A. The contract unit price for Geotextile installation on the slopes shall include full compensation for all labor, materials, and equipment required to furnish and install the Geotextile in accordance with the details and notes shown on the Drawings, and as indicated in the Specifications, and manufacturer’s recommendations.

B. Final pay quantities shall be determined by computing the actual surface area of Geotextile placed to the limits indicated on the Drawings (overlap at seams will not be measured separately for payment and material in anchor trenches and/or terminations will be considered as included in the respective Bid Item).

4.35 80 mil Single-Sided Textured HDPE Geomembrane Per Detail 2/C-501 (Slope)

A. The contract unit price for Geomembrane installation on the slopes shall include full compensation for all labor, materials, and equipment required to furnish and install the geomembrane in accordance with the details, and notes shown on the Drawings and as indicated in the specifications, and manufacturer’s recommendations.

B. Final pay quantities shall be determined by computing the actual surface area of Geomembrane placed to the limits indicated on the drawings (overlap at seams will not be measured separately for payment and material in anchor trenches and/or terminations will be considered as included in the respective Bid Item).

4.36 Geosynthetic Clay Liner (GCL) Per Detail 2/C-501 (Slope)

A. The contract unit price for GCL installation on the slopes shall include full compensation for all labor, materials, and equipment required to furnish and install the GCL in accordance with the details and notes shown on the Drawings, and as indicated in the Specifications, and manufacturer’s recommendations.

B. Final pay quantities shall be determined by computing the actual surface area of GCL placed to the limits indicated on the Drawings (overlap at seams will not be measured separately for payment and material in anchor trenches and/or terminations will be considered as included in the respective Bid Item).

4.37 60 mil Double-Sided Textured HDPE Geomembrane Per Detail 2/C-501 (Slope)

A. The contract unit price for Geomembrane installation on the slopes shall include full compensation for all labor, materials, and equipment required to furnish and install the geomembrane in accordance with the details, and notes shown on the Drawings and as indicated in the specifications, and manufacturer’s recommendations.

B. Final pay quantities shall be determined by computing the actual surface area of Geomembrane placed to the limits indicated on the drawings (overlap at seams will not be measured separately for payment and material in anchor trenches and/or terminations will be considered as included in the respective Bid Item).

Unit 2 Phase 5-2 Liner 10 Tetra Tech Q:\Landfills\_San Timoteo\Projects\2023 Unit 2 Phs 5-2 Liner and LCRS Expansion Project\DESIGN_BIDDING\ADVERTISEMENT AND BID\Addendum\Addendum 2\Draft Addendum 2\Attachment 2 - STSL Unit 2 Phase 5-2 Liner Specs - Section 01 20 00_Changes Accepted.docx

4.38 4-Inch Thick Veneer Soil Layer on Slopes Per Detail 2/C-501 [Deletable]

A. The contract unit price for Veneer Soil shall include full compensation for all labor, material, and equipment required for placement of the veneer soil layer, including excavation, processing, transport, placement, and compaction as indicated on the Drawings, and as specified in the Specifications.

B. This bid item is partially or fully deletable at the discretion of the County and increases or decreases beyond 25 percent of the estimated quantity will NOT constitute a new negotiated contract unit price.

C. Final pay quantities will be determined by survey of the actual square footage (surface area) of veneer soil layer constructed.

4.39 Subgrade Preparation Per Detail 2/C-501 (Slope) [Deletable]

A. The contract unit price for Subgrade Preparation shall include full compensation for all labor, materials, tools, equipment, and incidentals for doing all work involved in Subgrade Preparation, complete in place, including track walking and proof rolling as indicated on the Drawings, and as specified…