cn_4629-WellBoreSeals-TechnicalSpecs-3-15-24.pdf

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SPECIFICATIONS FOR CONTRACT

NO. 4629

KIEFER LANDFILL

LANDFILL GAS (LFG) WELL BORE SEAL

INSTALLATION

KIEFER LANDFILL

SLOUGHHOUSE, CA

PROJECT MANAGER

John Jowers, P.E.

County of Sacramento

Department of Waste Management and Recycling 10863 Gold Center Drive

Rancho Cordova, CA 95670

Kiefer Landfill LFG Well Bore Seal Installation Rev. 0

Special Provisions March 2024 Page 01000-1

DIVISION 1 - GENERAL REQUIREMENTS

SECTION 01000

SPECIAL PROVISIONS

1.1 Scope of Work

The work to be performed under this contract includes furnishing all labor, materials, and equipment, as provided in these Specifications, for the installation of well bore seals around existing vertical extraction wells at the Kiefer Landfill. A total of 92 (78 4”-casings and 14 6”-casings) well bore seals are to be installed at existing wells as shown on the Construction Plans.

1.2 Project Location

Kiefer Landfill 12701Kiefer Boulevard Sloughhouse, Ca. 95683

1.3 Drawings

The contract drawings are entitled: LFG Well Bore Seal Installation, Contract No.

4629, dated March 15, 2024.

1.4 Builder's Risk Insurance

Builder's Risk Insurance will not be required for this project.

1.5 CONTRACTOR’s Pollution Liability Insurance

CONTRACTOR’s Pollution Liability Insurance (CPL), with a $1,000,000 per claim limit, will be required as specified in Section 3-9, “Insurance,” of the Standard Construction Specifications.

1.6 Time of Completion

The time for completion of this contract shall be six (6) calendar months commencing as specified in Section 7-1, “Beginning of Work,” of the Standard Construction Specifications.

1.7 Liquidated Damages

Liquidated damages shall be $500 for each calendar day delay. Refer to Section

8.10 of the County Standard Construction Specifications.

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1.8 Pre-Bid Conference

A pre-bid conference will be held as noted in the NOTICE TO CONTRACTORS.

1.9 Standard Construction Specifications

The County of Sacramento 2016 Standard Construction Specifications revised on February 1, 2017 are hereby made part of these specifications. A copy of the Sacramento County Standard Construction Specifications may be downloaded from the County website at www.saccountyspecs.net.

The project specifications use a modified version of the Construction Specifications Institute (CSI) format that is comprised of 16 divisions. The CSI format divisions shall not operate to make the County an arbiter to establish subcontract limits between CONTRACTOR and/or subcontractors. The General CONTRACTOR is responsible to the COUNTY for all phases of construction and delivering a complete job.

1.10 Examination of Plans, Specifications, and Site of Work

Direct pre-bid questions to Sacramento County Department of Waste Management and Recycling’s Project Manager, John Jowers at jowersj@saccounty.gov

1.11 Accuracy of Drawings and Specifications

The existing conditions depicted on the drawings and specifications are developed from record information. Exact locations, distances, dimensions, elevations, etc., shall be governed by actual field conditions and verified by the CONTRACTOR.

The ENGINEER shall be notified of any discrepancies found prior to the start of work in that area.

1.12 LFG Collection System Shutdowns

The ENGINEER shall be notified five (5) working days in advance of any contemplated shutdown of any portion of the LFG collection system. The ENGINEER's approval shall be obtained prior to any shutdown activity. The CONTRACTOR shall schedule and coordinate all connections and other work to be performed for the completion of the project.

http://www.saccountyspecs.net/

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1.13 Storage of Supplies, Materials, Equipment, Etc.

The CONTRACTOR shall obtain the prior approval of the ENGINEER for any area or space required for CONTRACTOR's storage during construction operations. Materials, equipment, etc., shall not be piled or stored in any location that would interfere with the conduct of normal functions of the building and/or facilities, and shall not constitute a hazard to persons or property. The CONTRACTOR shall install any required safety precautions such as signs, danger signals, lanterns, barricades, etc., during construction operations.

1.14 Testing

No testing is required.

1.15 Additional Sets of Contract Documents

Following execution of the Contract, the County will provide electronic files in PDF format of contract specifications, drawings, and addenda to the CONTRACTOR. Hard copy sets of construction document sets will not be furnished.

1.16 Signs

No advertising signs of any kind will be permitted except by written permission of the ENGINEER.

1.17 CONTRACTOR's Field Office

A space for a CONTRACTOR field office shall be made available.

1.18 ENGINEER's Field Office

An ENGINEER’s field office is not required.

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1.19 Temporary Services

A. Water

1. CONTRACTOR may connect temporary line to existing water service lines at the site. The CONTRACTOR is to verify conditions at site.

B. Electrical Power

1. CONTRACTOR shall coordinate with Site ENGINEER in order to hook-up to existing service.

2. CONTRACTOR shall arrange for and install power service from SMUD service lines, as necessary.

C. Telephone

1. CONTRACTOR may arrange for and install telephone service for his or her own use. The CONTRACTOR shall not use County telephones.

D. Field Toilets

1. The CONTRACTOR shall furnish, install, and remove at completion of the job, all sanitary; i.e., portable toilet facilities required for the completion of the job. The type and location of the facilities shall be subject to acceptance by the ENGINEER.

2. All sanitary facilities shall be made available for use by all workers, subcontractors, consultants, and COUNTY personnel associated with the project.

3. The CONTRACTOR shall maintain sanitary facilities in a proper, safe, operating, and sanitary condition for the duration of the work. Facilities shall be provided in sufficient quantities to comply with CAL-OSHA regulations.

4. Existing facilities at site shall not be used by CONTRACTOR's employees.

E. Fences, Barricades, Warning Signs, And Lights

1. To confirm to CAL-OSHA regulations, other State of California and local codes, rules, regulations, and ordinances for protection of workers, public and private property, provide, install and maintain barricades, warning devices and other protection required therefore.

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2. CONTRACTOR to provide temporary fencing, etc., as required to protect material storage and equipment from theft, and vandalism.

F. CONTRACTOR's Access, Work and Storage Areas

1. CONTRACTOR to be limited to the work area shown on the drawings.

2. The CONTRACTOR shall coordinate with the Project Manager as to where the set-up staging area will be located.

1.20 Erosion, Sediment, and Water Pollution Control

Work under this contract shall be subject to the requirements of the NPDES Regulations and the Storm Water Pollution Prevention Plan (SWPPP) for the landfill. Construction related activities performed by the CONTRACTOR and subcontractor(s), shall be performed to eliminate non stormwater discharges to the stormwater control system. The CONTRACTOR shall notify the Site ENGINEER of any conditions that could lead to noncompliance with the permit requirements.

The CONTRACTOR shall not be entitled to any time extensions or compensation for any costs due to any action required as a result of CONTRACTOR’s failure to comply with those provisions of the Storm Water Pollution Control Plan. The CONTRACTOR is responsible to ensure that subcontractor(s) comply with this provision.

The CONTRACTOR is not required to obtain an NPDES Industrial permit. The CONTRACTOR is not required to submit a project-specific SWPPP. However, the CONTRACTOR shall abide with the site’s NPDES requirements in accordance with the site ENGINEER.

1.21 Special Security Requirements

The CONTRACTOR's workers and equipment shall be limited to the work areas as designated by this contract.

The CONTRACTOR shall make all necessary provisions and be responsible for the security of the work and the site until final inspection and acceptance of the work.

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1.22 Schedule of Work and Limitations

A. Operations

During the progress of work, landfill facilities operation shall be maintained without interruption, except by specific arrangement with the County and then only at such times as approved in writing by the ENGINEER. The CONTRACTOR will be required to maintain access to the operating portion of the landfill at all normal times of business. The CONTRACTOR will be required to provide traffic control and provide alternate routes of access if construction activities interfere with the flow of traffic along the Landfill's main access road or main haul roads. If construction activities impair the flow of customer traffic and alternate routes of access are not available, then evening and nighttime work periods will be used to complete the work.

B. Coordination of Contract Work with Owner's Operation

The CONTRACTOR shall coordinate the work of this contract through the Project Manager assigned by the County or ENGINEER. Progress meetings will be conducted weekly in accordance with the county of Sacramento, Standard Construction Specifications, Section 7.3 Preconstruction Conference and Progress Meeting. The CONTRACTOR shall submit a construction schedule and progress schedule in accordance with the County of Sacramento Standard Construction Specifications, Section 7.5.01 Progress Schedule.

C. Existing Landfill Gas (LFG) System

The CONTRACTOR shall coordinate all shutdowns of the existing LFG collection systems through the Project Inspector assigned by the County or ENGINEER. The CONTRACTOR shall make every effort to minimize the length of shutdowns during the course of the project.

D. Site and Material Conditions

Prior to the submission of a bid, The CONTRACTOR shall be responsible for having determined the site and LFG collection system conditions to his or her satisfaction, the nature and location of the work, the condition of the ground, the character and quality of the landfill, the type and quantity of materials to be encountered, the character of equipment and facilities needed preliminary to and during the execution of the work, the general and local conditions, and all other matters which can in any way affect the work under this Contract.

The prices established for the work to be done will reflect all costs pertaining to the work. Any project claims based on material, landfill, or leachate conditions will not be allowed.

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1.23 Allowable Times and Hours of Work

Typical work may be performed between the hours of 6 a.m. through 8 p.m., 7 days per week, excluding Legal Holidays. The CONTRACTOR may perform work between 8 p.m. and 6 a.m. When the CONTRACTOR wants to work between the hours of 8 p.m. and 6 a.m., the COUNTY must be notified 7 calendar days in advance.

1.24 NO WAIVER OF GOVERNMENT CLAIM PROCESS:

No statement in this Agreement shall constitute a waiver of government claim filing requirements pursuant to Title 1, division 3.6 of the California Government Code or as otherwise set forth in local, state and federal law.

1.25 Excavated Refuse

Excavated refuse shall be disposed of by the CONTRACTOR at the active face of the landfill between the hours of 6:30 and 4:30 Monday through Friday and 8:30 and 4:30 Saturday and Sunday. CONTRACTOR shall coordinate disposal with Landfill Operations early in the day that refuse disposal is anticipated. Any refuse not transported to the active cell must be covered by a plastic tarp overnight.

No disposal fee will be charged for disposal.

1.26 Submittals

Submittals shall be made to the COUNTY/ENGINEER a minimum of 7 days in advance of the commencement of work. All submittals shall be provided digitally in a PDF format. The COUNTY/ENGINEER shall review and return submittals within 5 working days. CONTRACTOR shall make additional submittals as required. COUNTY's/ENGINEER's approval of submittals shall not relieve CONTRACTOR from responsibility for any resulting deficiencies or related unapproved deviations from the Construction Drawings and Specifications.

The following submittals shall be made:

• Injury Illness Prevention Program

• Code of Safe Work Practices, Contract Specific Safety Plan Task Specific Safety Plan

• Well Bore Seals, Butyl Adhesive, and Stainless Steel Clamps

END OF SECTION

Measurement and Payment March 2024 Page 01270-1

SECTION 01270

MEASUREMENT AND PAYMENT

PART 1 - GENERAL

1.1 Summary

A. Section includes general requirements for measurement and payment as they apply to this Contract.

B. The CONTRACTOR will compute all quantities. Where necessary, such computations will be based upon surveys performed by the CONTRACTOR.

Quantities for final payment will be reviewed and approved by the COUNTY.

1.2 Related Sections

A. Measurement and Payment - Section 8 of the Standard Construction

Specifications.

1.3 Measurement of Quantities

A. Measurement Standards: All work to be paid for at a Contract price per unit of measurement will be verified by the COUNTY consistent with United States Standard Measures.

B. Measurement by Volume:

1. Measurement by volume will be by the cubic dimension listed or indicated in the Bid Schedule. Method of volume measurement will be as determined or directed by the COUNTY.

2. Confirmation of volume may be required by utilizing weighing methods.

In this event, such volumes will be converted to weight measurement for payment purposes. Factors for conversion from weight measurement to volume measurement will be determined by the COUNTY and shall be agreed by the CONTRACTOR before such method of measurement of pay quantities will be accepted.

C. Measurement by Area: Measurement by area will be by the square dimension listed, or indicated in the Bid Schedule. Method of square measurement will be as determined or directed by the COUNTY.

D. Linear Measurement: Linear measurement will be by the linear dimension listed or indicated in the Bid Schedule. Method of linear measurement will be as determined or directed by the COUNTY. Generally, items, components, or work to be measured will be measured at the centerline of the item in place.

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E. Lump-Sum Measurement: Lump-sum measurement will be for the entire item, unit of work, structure, or combination thereof, as listed or indicated in the Bid Schedule.

F. Allowance: Payment under an allowance item will only be made upon acceptance and approval of quantities of work, invoices or other appropriate documentation as determined by the Agency.

1.4 Field Measurement for Payment

A. The CONTRACTOR shall compute all quantities of work performed or of materials and equipment delivered to the site for payment purposes.

B. The COUNTY may at any time verify quantities calculated by the

CONTRACTOR.

1.5 Payment

A. Payment will be full compensation for furnishing all labor, materials, tools, equipment, transportation, permit fees, services, and incidentals, as specified, and for performing all work necessary for completing the erection or installation of the item or work classification, including all adjusting and balancing, testing, cleaning, and all other incidental work.

B. Full compensation for all expenses involved in conforming to the requirements for measuring materials or work shall be considered as included in the unit or lump-sum prices paid for the materials or work being measured, and no additional compensation will be permitted.

C. Full compensation for an item of work for which no measurement or payment is specified will be considered to be included in the applicable related item of work in the Bid Schedule or incidental of the Contract.

1.6 Values of Unit Prices

A. The number of units and quantities contained in the Bid Schedule are approximate only, and final payment will be made for the actual number of units and quantities, which are incorporated in or made necessary by the work included in this Contract.

B. In the event that work and materials or equipment are required to be furnished to a greater or lesser extent than is indicated by the Construction Drawings and Specifications, such work and materials or equipment shall be furnished in greater or lesser quantities.

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1.7 Changes and Extra Work

A. Changes and extra work ordered by the COUNTY will be measured and paid for consistent with the requirements of Changes and Claims - Section 9 of the Standard Construction Specifications.

1.8 Rejected Materials

A. Quantities of material wasted or disposed of in a manner not called for under the Contract will not be paid. Rejected loads of material, including material rejected after it has been placed by reasons of the failure of the CONTRACTOR to conform to the provisions of the Contract; material not unloaded from the transporting vehicle; material placed outside the limits indicated on the Drawings or established by the COUNTY; or material remaining on hand after completion of the work, will not be paid for, and such quantities shall not be included in the final total quantities. No compensation will be permitted for loading, hauling, and disposing of rejected material. CONTRACTOR is responsible for removing all CONTRACTOR supplied rejected and unused materials from site.

1.9 Contract Bid Items

REQUIREMENTS INCLUDED

A. This section includes the items of work and the basis of payment for these tasks. The CONTRACTOR shall bid Items listed below separately and provide a total sum for all work items. The CONTRACTOR is responsible for supplying all materials, unless otherwise indicated in the bid item or as specifically provided in these Specifications, equipment and labor necessary for the complete construction and installation of all work as described in these specifications and as shown on the Construction Drawings. Payment for each work item will be made on either a unit price (EA), lump sum (LS), lineal foot (LF), vertical foot (VF), cubic yard (CY), acre (AC), or square foot (SF) basis, and only after that portion of the project has been completed.

Item 1. Mobilization and Demobilization. This task includes any and all temporary facilities and utilities, health and safety plans, and construction equipment required for this project. Payment for this work will be made on a lump sum (LS) basis. Payment shall be made in accordance with Section 8-1 of the Standard Specification.

Item 2. Well Bore Seal Installation. Supply all material, equipment and labor necessary for the installation of well bore seals a shown on the Construction Drawings. Installation will include excavation of

March 2024 Page 01270-4 existing soil cover to the required depth, removal of existing wellheads, placement of seals, replacement and compaction of soil, and replacement of existing wellheads. Payment for this item will be on a unit price (EA) basis.

Rev.0

Well Bore Seals March 2024 Page 02100-1

SECTION

02000

EXCAVATION, BACKFILLING, AND COMPACTION

PART 1 – GENERAL

1.1 Description

A. Work Included:

1. The work described in this section consists of furnishing all labor, materials, equipment, and incidentals necessary for excavating, grading, backfilling, and compacting, complete as shown on the Contract Drawings and as specified herein.

B. All work under this section, as applicable, shall comply with the requirements of the County of Sacramento 2016 Standard Construction Specifications, Revised February 2017 with exceptions and special requirements as set forth herein in the Special Provisions.

1.2 Federal and State Regulatory Requirements

A. All trench excavations which exceed 5 feet in depth shall comply with the applicable trench safety standards as stated in the OSHA excavation safety standards 29 CFR S.1926.650 Subpart P.

1.3 Job Conditions

A. Protection of Existing Items:

1. All bench marks, monuments, and other reference points shall remain undisturbed unless specifically directed otherwise by the COUNTY.

B. Coordination with Others:

1. CONTRACTOR shall give adequate prior notice to the COUNTY, utility agencies, and other legal authorities prior to starting work.

2. CONTRACTOR shall coordinate his operations with Landfill Operations, Energy Power Partners, other contractors, trades, utility firms, and other affected public departments to assure continuity of both access and work, in conformance with applicable requirements of these organizations. Services to adjacent, adjoining property shall not be impeded.

PART 2 – PRODUCTS

2.1 Materials

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A. General:

1. On-site excavated materials may be used where approved by the

COUNTY.

2. Rocks larger than 2 inches in diameter, trash, and objectionable materials shall be removed from all fills to be compacted.

B. Fill Materials:

1. Fill to cover well bore seals will consist of soils excavated to place seals, as noted in the Construction Drawings.

PART 3 – EXECUTION

3.1 Inspection

A. Verification of Existing Conditions:

1. In addition to examining the Construction Plans, the CONTRACTOR is expected to have visited and inspected the site in order to determine the grades and true conditions under which the work is to be performed.

2. Should any omissions, conflicts, or ambiguities in the Specifications or

Construction Drawings be discovered during the examination of the Contract Documents or upon visiting the premises of the project during the construction, such discrepancies shall be brought to the attention of the project manager prior to construction. The questions will be reviewed and, where the information sought is not clearly specified or indicated on the Drawings, a clarification will be issued which shall become a part of the Construction Documents.

3.2 Protection

A. Pumping and Drainage:

1. The CONTRACTOR shall at all times during construction provide and maintain proper equipment and facilities to remove all water entering excavations, and shall keep such excavations dry so as to obtain a satisfactory undisturbed subgrade foundation condition.

3.3 Excavation, Backfill, Fill Placement and Compaction

A. Materials:

1. Materials placed in backfill shall be free from rocks or stones larger than

2 inch, as well as brush, stumps, logs, roots, debris, and organic or other

March 2024 Page 02100-3 deleterious materials; and must be approved by the COUNTY.

B. Excavation and Backfilling:

1. If the bottom of any excavation is taken below the limits shown on the Contract Drawings or specified or directed by the ENGINEER, it shall be refilled at the CONTRACTOR's expense with the materials specified in Item 2.1.

2. If, in the opinion of the COUNTY, the material, in its undisturbed natural condition, at or below the normal grade of the excavation as indicated on the Contract Drawings, is unsuitable for foundation, it shall be, removed to such depth and width as the ENGINEER may direct and replaced with suitable material.

3. No excavation shall be allowed to remain open overnight, unless otherwise approved by the COUNTY.

4. As soon as practical after well bore seals have been placed, backfilling shall begin and thereafter be prosecuted expeditiously.

5. Excavations shall be backfilled to the original grades or as indicated on the Contract Drawings. Deviation from these grades because of settling shall be corrected by the CONTRACTOR. Backfill operation shall be performed to comply with rules and regulations and in such manner that it does not create a nuisance or safety hazard.

3.4 Excess Excavated Materials

A. All suitable excess excavated material shall be stockpiled in areas specified by the project manager.

B. All debris, junk, stones, refuse, logs, stumps, roots, and other unsuitable excavated materials will be disposed of by the CONTRACTOR to working face of the landfill during regular business hours.

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SECTION

02100

WELL BORE SEALS

PART 1 – GENERAL

1.1 Description

A. Work Included:

1. The work described in this section consists of furnishing all labor, materials, equipment, and incidentals necessary for installing well bore seals as shown on the Contract Drawings and as specified herein.

B. All work under this section, as applicable, shall comply with the requirements of the County of Sacramento 2016 Standard Construction Specifications, Revised February 2017 with exceptions and special requirements as set forth herein in the Special Provisions.

1.2 Job Conditions

A. Protection of Existing Items:

1. CONTRACTOR will be responsible for damages incurred to existing site items as a result of CONTRACTOR actions.

2. CONTRACTOR will take necessary precautions to protect existing landfill gas infrastructure, roadways, surface grading, and vegetation during construction.

3. Temporary soil mounds may be placed over existing landfill gas piping by CONTRACTOR to act as equipment crossings and protect existing infrastructure. CONTRACTOR to notify COUNTY prior to soil mound placement. CONTRACTOR to remove temporary soil mounds if requested by COUNTY.

4. CONTRACTOR will protect existing wellheads and associated pipe and fittings from damage during work to allow for re-use.

B. Coordination with Others:

1. CONTRACTOR shall give adequate prior notice to the COUNTY, utility agencies, and other legal authorities prior to starting work.

2. CONTRACTOR shall coordinate his operations with Landfill Operations, NextERA, other contractors, trades, utility firms, and other affected public departments to assure continuity of both access and work, in conformance with applicable requirements of these organizations. Services to adjacent, adjoining property shall not be impeded.

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PART 2 – PRODUCTS

2.1 Well Bore Seal Materials

A. Well bore seals consist of a 30 mil. PVC 10-foot by 10-foot skirt with 3-foot vertical boot, or similar upon prior approval by the COUNTY.

B. Banding to be wormgear-style stainless steel, or similar upon prior approval by the COUNTY.

C. Gasket, tape, and welding material to be butyl tape, or similar upon prior approval by the COUNTY.

PART 3 – EXECUTION

3.1 Verification of Existing Conditions

A. In addition to examining the Construction Plans, the CONTRACTOR is expected to have visited and inspected the site in order to verify the diameter and configuration of wells to receive well bore seals.

B. Should any omissions, conflicts, or ambiguities in the Specifications or Construction Drawings be discovered during the examination of the Contract Documents or upon visiting the premises of the project during the construction, such discrepancies shall be brought to the attention of the project manager prior to construction. The questions will be reviewed and, where the information sought is not clearly specified or indicated on the Drawings, a clarification will be issued which shall become a part of the Construction Documents.

3.2 Wellhead Removal:

A. CONTRACTOR to remove existing gas wellheads immediately prior to well bore seal installation. CONTRACTOR to completely shut wellhead valves prior to remove to prevent air intrusion into the landfill gas extraction system.

B. CONTRACTOR to use temporary PVC caps on existing wells to limit emissions, as necessary.

C. CONTRACTOR to limit time a wellhead is offline and removed from service.

3.3 Well Bore Seal Installation:

A. CONTRACTOR to place well bore seals at the depths and soil cover shown on the Construction Plans. CONTRACTOR to ensure soil in contact with well bore seals has no sharp or protruding materials which could cause punctures.

B. Well bore seals to be placed with approximately 1-foot of slack in vertical boot.

C. Well bore seal boots to be secured to existing casings by placing butyl tape (or

March 2024 Page 02100-3 similar) between seal boot tops and well casing. Stainless steel worm-gear style clamps to be placed over well bore seal boot tops.

3.4 Replacement of Wellheads:

A. CONTRACTOR to replace wellheads removed during construction back to operational status.

B. CONTRACTOR to open wellheads only 1 full turn after reconnecting to the extraction system.

3.5 Excess Materials

A. All suitable excess material shall be stockpiled in areas specified by the

COUNTY.