Specifications_2022_Gas_System_Improvements_final.pdf

SPECIFICATIONS FOR CONTRACT

NO. 4579

KIEFER LANDFILL

2022 GAS SYSTEM IMPROVEMENTS

KIEFER LANDFILL

SLOUGHHOUSE, CA

PROJECT MANAGER

Rachel Davis County of Sacramento

Department of Waste Management and Recycling 10863 Gold Center Drive

Rancho Cordova, CA 95670

Kiefer Landfill 2022 Gas System Improvements section 01000 (special provisions).doc

Special Provisions August 2022 Page 01000-1

DIVISION 1 - GENERAL REQUIREMENTS

SECTION 01000

SPECIAL PROVISIONS

1.1 Scope of Work

The work for be performed under this contract includes furnishing all labor, materials, and equipment, as provided in these Specifications, for the construction of thirty five new vertical extraction wells, and approximately 13,929 linear feet of collection piping at the Kiefer Landfill.

1.2 Project Location

Kiefer Landfill 12701Kiefer Boulevard Sloughhouse, Ca. 95683

1.3 Drawings

The contract drawings are entitled: Kiefer Landfill, 2022 Gas System Improvements, Contract #4579

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 80 working days 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, Rachel Davis at davisrac@saccounty.net.

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/ mailto:davisrac@saccounty.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

Testing of soils, asphalt, concrete and aggregate shall be performed by the County in accordance with Section 5-16 Materials Sampling and Testing of the County Standard Construction Specifications. All other tests shall be performed and paid for by the CONTRACTOR as required in these contract documents.

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.

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.

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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 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.

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.

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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 submit a Water Pollution Control Plan to the Site ENGINEER in compliance with the site specific SWPPP. 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 a NPDES Industrial permit.

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.

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.

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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 number of shutdowns during the course of the project. Shutdown of the systems shall be limited as follows:

• Any portion of the LFG collection system shall not be shutdown for more than 4 hours in a row.

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 landfill, existing gas system, leachate, or other site conditions will not be allowed.

1.23 ALLOWABLE TIMES AND HOURS OF WORK

Typical work may be performed between the hours of 5 a.m. through 8 p.m., 7 days per week, excluding Legal Holidays. The CONTRACTOR may select 10 occasions where they will perform work between 8 p.m. and 5 a.m. When the CONTRACTOR wants to work a night, 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

August 2022 Page 01000-7 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 seven 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 Water Pollution Control Plan Driller Qualifications Landfill Gas Well Aggregates Bentonite Perforated Sch. 80 PVC Pipe and Fittings HDPE Pipe and Fittings Butterfly Valves 2-inch Poly Valves Wellhead Assemblies Flexible Hose Boreholes and As-Built Logs per Section 02600-1.2 As-Built Drawings per Section 02750 – 1.4

END OF SECTION

section 01270 (measurement and payment).doc

Measurement and Payment August 2022 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.

August 2022 Page 01270-2

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, 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, water pollution control plan, surveys, 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.

August 2022 Page 01270-4

Item 2. Vertical Extraction Wells. Supply all material, equipment and labor necessary for the drilling and construction of vertical extraction wells as shown on the Construction Drawings.

Measurement shall be made from the ground surface to the maximum depth of the well casing. Payment for this item will be on a vertical foot (VF) basis.

Item 3. Extraction Wellheads. Supply all materials, equipment and labor for the construction of the extraction wellheads. This item includes installing a wellhead or a remote wellhead, fittings, and flex hoses with adequate slack and appurtenances as shown on the Construction Drawings. Payment for this item will be on a unit price (EA) basis.

Item 4. Boring Abandonment. Supply all equipment and labor for Boring

Abandonment. Soil may be obtained from on-site stockpiles.

Measurement shall be per linear foot for abandoned well borings from the maximum depth of the boring to ground surface.

Payment for this item will be on a vertical foot (VF) basis.

Item 5. 3” SDR 9 HDPE Pipe. Supply all materials, equipment and labor for the construction and installation of 3-inch diameter SDR 9 HDPE lateral pipe as shown on the Construction Drawings.

Include all labor and materials for the SDR 9 HDPE pipe, fittings, joining, including cutting, cleaning and fusing of pipe, as applicable, road crossings, if applicable, and connection to new or existing HDPE header. Payment for this item will be made on a linear foot (LF) basis.

Item 6. 4” SDR 9 HDPE Pipe. Supply all materials, equipment and labor for the construction and installation of 4-inch diameter SDR 9 HDPE lateral pipe as shown on the Construction Drawings.

Include all labor and materials for the SDR 9 HDPE pipe, fittings, joining, including cutting, cleaning and fusing of pipe, as applicable, road crossings, if applicable, and connection to new or existing HDPE header. Payment for this item will be made on a linear

Item 7. 8” SDR 17 HDPE Pipe. Supply all materials, equipment and labor for the construction and installation of 8-inch diameter SDR 17 HDPE header pipe as shown on the Construction Drawings.

Include all labor and materials for the SDR 17 HDPE pipe, fittings, joining, including cutting, cleaning and fusing of pipe, as applicable, road crossings, if applicable, and connection to new or existing

August 2022 Page 01270-5

HDPE header. Payment for this item will be made on a linear foot (LF) basis.

Item 8. 12” SDR 17 HDPE Pipe. Supply all materials, equipment and labor for the construction and installation of 12-inch diameter SDR 17 HDPE header pipe as shown on the Construction Drawings.

Include all labor and materials for the SDR 17 HDPE pipe, fittings, joining, including cutting, cleaning and fusing of pipe, as applicable, road crossings, if applicable, and connection to new or existing HDPE header. Payment for this item will be made on a linear foot (LF) basis.

Item 9. 24” SDR 17 HDPE Pipe. Supply all materials, equipment and labor for the construction and installation of 24-inch diameter SDR 17 HDPE header pipe as shown on the Construction Drawings.

Include all labor and materials for the SDR 17 HDPE pipe, fittings, joining, including cutting, cleaning and fusing of pipe, as applicable, road crossings, if applicable, and connection to new or existing HDPE header. Include labor and materials to move existing 2” compressed air line, and 2” condensate line to align these lines with the new 24” pipe. Payment for this item will be made on a linear

Item 10. 8-inch Butterfly Valve Installation. Supply all materials, equipment and labor for the installation of 8-inch butterfly valves.

Include all labor and materials for the butterfly valves, beveled flange adapters, flanges, fittings, and appurtenances. Payment for this item will be a lump sum for each valve replaced (LS).

Item 11. 12-inch Butterfly Valve Installation. Supply all materials, equipment and labor for the installation of 12-inch butterfly valves.

Include all labor and materials for the butterfly valves, beveled

Item 12. 24-inch Butterfly Valve Installation. Supply all materials, equipment and labor for the installation of 24-inch butterfly valves.

Include all labor and materials for the butterfly valves, beveled section 01400 (layout of work and surveys).doc

Layout of Work and Surveys August 2022 Page 01400-6

SECTION 01400

LAYOUT OF WORK AND SURVEYS

PART 1 - GENERAL

A. Section includes general requirements for survey work to be performed by the

CONTRACTOR for layout of work features, for performance of work, and for field measurements of work quantities for payment purposes.

B. The CONTRACTOR and the COUNTY shall share responsibility for and perform surveys and measurements necessary for layout and control of work, as specified in this section. Surveys shall be performed in accordance with the requirements of Section 5-9.03 of the Standard Construction Specifications.

C. Before commencing and surveys, the CONTRACTOR shall give the COUNTY

2 working days written notice in advance so that the COUNTY may witness such work.

1.2 Related Sections

A. Section 01270 - Measurement and Payment and Section 5-9.03 of the Standard

Construction Specifications.

1.3 Description

A. Reference Points: The reference points to be provided by the COUNTY will include referenced monuments, survey control line(s), and elevation bench marks in the vicinity of the project. If displaced by the CONTRACTOR, replacement of these reference points will be at the expense of the CONTRACTOR. All other necessary reference points shall be established by the CONTRACTOR.

B. The CONTRACTOR shall furnish all necessary detail surveys including all lines, grades, and appropriate surveys as specified. Surveys shall be performed under direct supervision of a California Registered Professional Land Surveyor.

C. The COUNTY reserves the right to perform any desired checking and correction of the CONTRACTOR’s surveys but this shall not relieve the CONTRACTOR of the responsibility for adequate performance of the work.

The COUNTY will complete any checking within 2 working days of the CONTRACTOR’s completed survey.

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D. Equipment and Personnel: The CONTRACTOR’s instruments and other survey equipment shall be accurate, suitable for the surveys required, consistent with recognized professional standards, and in proper condition and adjustment at all times.

E. Field Notes and Records: The CONTRACTOR shall record surveys in duplicate page field notebooks. The original pages of such records shall be furnished to the COUNTY at intervals required by the COUNTY. The COUNTY will have up to 2 working days to review the data and notify the CONTRACTOR of any errors. A duplicate of each field notebook shall be furnished to the COUNTY when filled or completed.

F. Use by the COUNTY: The COUNTY may at any time use line and grade points and markers established by the CONTRACTOR. The CONTRACTOR’s surveys are a part of the work and may be checked by the COUNTY or representatives of the COUNTY at any time. The CONTRACTOR shall be responsible for (1) any lines, grades, or measurements which do not comply with specified or proper tolerances, or which are otherwise defective and (2) any resultant defects in the work. The CONTRACTOR will be required to conduct resurveys or check surveys to correct errors indicated by review of the field notebooks or otherwise detected.

1.4 Surveys for Layout and Performance of Work

A. The COUNTY shall stake all new well locations and underground piping in advance of construction. The CONTRACTOR shall perform any additional surveys for layout and performance of the work, reduce the field notes, make necessary calculations, and prepare drawings necessary to carry out such work.

1.5 Surveys for Measurement for Payment

A. When the Technical Specification or the COUNTY require Bid Schedule items of work to be measured by surveying methods, the CONTRACTOR shall perform the surveys. The CONTRACTOR will reduce the field notes and calculate final quantities for payment purposes. A duplicate of the note reductions and calculations will be given to the COUNTY for review and approval.

1.6 Surveys for As-Built Drawings

A. The COUNTY shall provide CONTRACTOR with the most recent topographic survey for the site to serve as the preconstruction topographic survey. The CONTRACTOR shall perform the as-built survey of constructed facilities at the completion of the project. The location of the new gas well survey points for

August 2022 Page 01400-8 survey (top of cover soil) shall be taken directly above the survey point previously provided by the COUNTY (i.e., same northing and easting). This as-built will be submitted on drawings to the COUNTY indicating location of survey point (i.e., northing, easting, and elevation) and shall be stamped by a California Registered Professional Land Surveyor. The COUNTY shall have up to 5 working days to review and approve the as-built surveys. After final approval by the COUNTY, the CONTRACTOR shall submit two sets of final drawings and electronic copies for each survey. Final drawings shall present elevations of finished layers, and surveyed locations of all LFG wells, LFG piping, pipe bends and junctions.

1.7 Surveying Accuracy and Tolerances in Setting of Survey Stakes

A. Control traverse field surveys and computations shall be performed to an accuracy of at least 1:24,000.

B. The tolerances generally applicable in setting survey stakes shall be set forth below. Such tolerances shall not supersede stricter tolerances required by the Construction Drawings or Technical Specifications, and shall not otherwise relieve the CONTRACTOR of responsibility for measurements in compliance therewith.

Type of Line or Mark Horizontal Position Elevation

Permanent Reference Points 1 in 10,000 ±0.01 foot

General Excavation and 1 in 2,000 ±0.1 foot Earthwork

C. Tolerances for designed depths and thicknesses shown on the Construction

Drawings and for Elevations shown on the Contract Drawings shall be ±0.10 foot, unless otherwise stated in these Technical Specifications or on the Drawings.

section 02111 (waste handling).doc

Waste Handling August 2022 Page 02111-1

PART 1 – GENERAL

SECTION 02111

WASTE HANDLING

A. The CONTRACTOR shall furnish all labor, materials, tools, supervision, transportation, equipment and incidentals necessary to complete the Waste Handling during construction, including excavation of LFG wells. The work will be carried out as specified herein and in accordance with the General Conditions and Drawings.

PART 2 – PRODUCTS

2.1 Materials

A. Waste material is defined as existing waste refuse located within the Kiefer Landfill. It does not include construction debris generated during implementation of the work.

PART 3 – EXECUTION

3.1 Preparation

A. The COUNTY shall stake and flag locations of existing gas-extraction wells and associated condensate or monitoring devices so as to minimize the likelihood of damage to the existing gas-extraction system.

B. The CONTRACTOR shall protect benchmarks, existing utilities, drainage structures, fences, and COUNTY staked and flagged facilities from excavation equipment and construction traffic.

C. The CONTRACTOR shall, on a continuous basis, install check dams, pumps, and all means necessary to collect and dispose of liquid that comes in contact with waste, in accordance with Part 3.03. The CONTRACTOR shall make all necessary provisions to keep uncontaminated stormwater separate from liquid that come in contact, or has been in contact, with the waste.

3.2 General Waste Excavation and Disposal

A. CONTRACTOR shall load, haul, and dispose of excavated waste to the active working face of the landfill as designated by the Owner, with those costs borne by the CONTRACTOR. Disposal will only be allowed during regular landfill operating hours. There will be no tipping fee for waste generated with this project.

B. CONTRACTOR shall be responsible for dust control related to construction activities.

section 02111 (waste handling).doc

Waste Handling August 2022 Page 02111-2

C. Prior to the end of each working day and prior to projected storm events, the CONTRACTOR shall cover all exposed waste with a minimum of 6 inches of cover soil or plastic sheeting.

D. In addition to limiting the extent of exposed waste, placement of soil cover materials, application of dust suppressants (or water), and/or odor suppressants shall be performed by the CONTRACTOR as needed to satisfactorily control dust and odors (or as directed by the project manager) during the construction.

3.3 Drainage

A. At all times during construction, the CONTRACTOR shall provide and maintain proper equipment and facilities to remove all water entering the construction area so as to obtain and maintain satisfactory working conditions.

Rev.0

Excavation, Backfilling, and Compaction August 2022 Page 02300-3

SECTION 02300

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 Standard Construction Specifications, Revised February 1, 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, Energy Power Partners, utility agencies, and other legal authorities prior to starting work.

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

PART 2 – PRODUCTS

2.1 Materials

A. General:

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

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2. Rocks larger than 4 inches in diameter, trash, and objectionable materials shall be removed from all fills to be compacted.

B. Fill Materials:

1. Bedding: Bedding shall consist of sound earthen material and shall be free of broken concrete, broken pavement, wood, organic material, refuse, or other deleterious material.

PART 3 – EXECUTION

3.1 Inspection

A. Verification of Existing Conditions:

1. In addition to examining the topographic survey, 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.

2. Dewatering shall at all times be conducted in such a manner as to preserve the undisturbed bearing capacity of subgrade soils at the bottom of the excavation.

3. Dewatering may be accomplished by means of submersible pumps. trash pumps, settling tanks, transfer pumps, and water trucks/tankers.

3. Storm water entering the excavation from surface runoff shall be collected in shallow ditches around the perimeter of the excavation, drained to sumps, and pumped from the excavation to maintain a bottom free from standing water. Any requirements and costs for such use shall be the responsibility of the CONTRACTOR. The CONTRACTOR shall not cause flooding by overloading

August 2022 Page 02300-5 or blocking flow in the drainage facilities, and shall leave the facilities unrestricted and clean as originally found. Any damage to facilities shall be repaired or restored as directed by the project manager, at no cost to COUNTY.

4. Conveying of dewatered liquids in open ditches or trenches will not be allowed.

Permission to use any storm sewers, or drains, for water disposal purposes shall be obtained from the project manager. Any leachate collected from any excavation will be collected and hauled off site for disposal. Any damage to facilities shall be repaired or restored as directed by the project manager, at no cost to COUNTY.

3.3 Excavation, Backfill, Fill Placement and Compaction

A. Materials:

1. Materials placed in backfill shall be free from rocks or stones larger than 1 inch, as well as brush, stumps, logs, roots, debris, and organic or other deleterious materials; and must be approved by the COUNTY.

A. 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 2.01.

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. Bedding shall be placed to a depth of 6 inches below the bottom of pipe and shall be thoroughly compacted.

5. As soon as practical after the pipe has been laid, jointed, and tested, backfilling shall begin and thereafter be prosecuted expeditiously.

6. 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.

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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.

section 02350 (lfg collection well aggregate).doc

Landfill Gas Collection Well Aggregate August 2022 Page 02350-1

SECTION 02350

LANDFILL GAS COLLECTION WELL AGGREGATE

PART 1 – GENERAL

1.1 Summary

A. The CONTRACTOR shall furnish all labor, materials, tools, supervision, transportation, equipment, and incidentals necessary for the installation of the Landfill Gas Collection Well Aggregate. The work shall be carried out as specified herein and in accordance with the General Conditions and Drawings.

1.2 Submittals

A. The CONTRACTOR shall submit to the ENGINEER for approval, at least 7 days prior to the start of construction, Certificates of Compliance for proposed aggregate materials. Certificates of Compliance shall indicate that the aggregate source meets the material requirements specified in this Section.

1.3 Quality Assurance

A. The CONTRACTOR shall ensure that the materials and methods used for aggregate meet the requirements of the Drawings and this Section. Any material or method that does not conform to these documents, or to alternatives approved, in writing, by the ENGINEER will be rejected and shall be repaired or replaced by the CONTRACTOR.

B. The CONTRACTOR shall be aware of all monitoring and field/laboratory conformance testing required by the ENGINEER. This monitoring and testing, including random conformance testing of construction materials and completed work, will be performed by the ENGINEER. If nonconformance’s or other deficiencies are found in the materials or completed work, the CONTRACTOR will be required to repair or replace the deficiency.

PART 2 – PRODUCTS

2.1 Aggregate

Aggregate shall be graded as follows: 100 percent passing 2-inch and 5 percent passing ½-inch.

3.1 Storage

A. The CONTRACTOR shall store aggregate in locations approved by the

ENGINEER. All aggregate shall be placed on firm soil. CONTRACTOR shall minimize contamination of the aggregate with other materials.

section 02350 (lfg collection well aggregate).doc

Landfill Gas Collection Well Aggregate August 2022 Page 02350-2

3.2 Placement

A. The CONTRACTOR shall place to the lines, grades, and dimensions shown on the Drawings.

B. The CONTRACTOR shall avoid puncturing or damaging in any way the gas well collection piping during placement of the aggregate material.

C. Any damage to the gas well collection piping which is caused by the CONTRACTOR or his representatives shall be repaired by the CONTRACTOR, at his expense.

D. No density or moisture requirements are specified for placement of the landfill gas collection well aggregate material.

section 02600 (vertical lfg wells).doc

Vertical Landfill Gas Wells August 2022 Page 02600-3

SECTION 02600

VERTICAL LANDFILL GAS WELLS

PART 1 – GENERAL

1.1 Description of Work

A. The CONTRACTOR shall furnish all labor, materials, tools, supervision, transportation, equipment and incidentals necessary for the installation of vertical landfill gas wells on this project. The work will be carried out as specified herein and in accordance with the General Conditions and Drawings.

B. Location, quantity, and depth of wells shall be as indicated on the Drawings.

The CONTRACTOR shall follow the well drilling schedule provided on the Drawings.

1.2 Submittals

A. The CONTRACTOR shall submit driller qualifications, including the driller’s license number.

B. The CONTRACTOR shall submit to the ENGINEER for approval, at least 7 days prior to the start of construction, Certificates of Compliance for proposed bentonite plug materials, which indicate meeting the material requirements of this Section.

C. The CONTRACTOR shall furnish the Project Manager with a drilling log prepared at the site and including the following information:

1. Well number.

2. Name of supervising professional ENGINEER, registered geologist, or other qualified person completing the form.

3. Description of materials encountered, including generalized composition, level of decomposition, and level of compaction.

4. Assessment of moisture in materials and solid to liquid ratio if free liquid is present.

5. Time, depth (5-ft increments typically), refuse description and description of unusual occurrences or problems during drilling.

D. The CONTRACTOR shall submit to the Project Manager a final well as-built log, including the following information:

1. Well number.

2. Date and time of completion of the well.

3. Northing, easting, and elevation of the ground surface at the location of the completed well.

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4. Name of supervising professional ENGINEER, registered geologist, or other qualified person completing the form.

5. Borehole diameter.

6. Depth of the bottom of the casing and bottom of the borehole.

7. Casing material and diameter and wall thickness (SDR or Schedule).

8. Perforated or screened interval.

9. Type, size, and intervals of gravel pack, bentonite, and clean soil backfill installed.

PART 2 – PRODUCTS

2.1 Vertical Wells

A. The CONTRACTOR shall provide pipe, aggregate, and bentonite grout that meets the requirements of the Drawings and these Technical Specifications

B. Piping and fittings shall be schedule 80 PVC pipe conforming to ASTM Standard D 1784. Screened interval of the piping shall be perforated in accordance with the drawing detail.

2.2 Materials - Bentonite

A. The bentonite shall be high-swelling, sodium montmorillonite (in pellet or powder form) containing no added organic polymers. The material shall exhibit the following properties:

1. Grain size: 80% passing the #200 Sieve per ASTM D-122.

2. Plasticity Index: 54 per ASTM D-4318.

3. Expansion Index: 289 per UBC 29-2

B. Water should be added to the bentonite at a ratio of 1 gallon for every 2 pounds of bentonite, to allow for proper hydration. Water added to bentonite shall be of suitable quality and free of pollutants and contaminants.

PART 3 – EXECUTION

3.1 General

A. The CONTRACTOR shall install the Vertical Wells to the lines and grades indicated on the Drawings.

3.2 Drilling

A. Drilling Methods: The CONTRACTOR shall provide a minimum borehole diameter of 30-inches for each LFG well to the depth indicated in the Drilling Schedule shown on the Drawings.

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B. Boring Depths: Actual depths will depend on conditions encountered during drilling. An estimated drilling schedule is provided on the Drawings. The COUNTY shall complete a construction survey to verify the surface elevation, and well bore depth at each proposed well location prior to drilling.

C. Boring Cover: When the boring construction activities are inactive, the CONTRACTOR shall cover the boring. At a minimum, the boring shall be covered with ¾-inch plywood sheeting, plastic sheeting, and soil on the edges.

These actions are intended to limit air intrusion into the landfill.

D. Obstructed Borings: If obstructions are encountered during borehole advancement, the CONTRACTOR shall continue drilling until it is demonstrated that further efforts to advance the borehole are impractical. The Project Manager will determine which of the following courses of action will be taken:

1. Abandonment: The CONTRACTOR shall abandon the borehole by backfilling with silty soil at the direction of the Project Manager. The CONTRACTOR shall relocate borehole at the direction of the Project Manager. No submittals will be required. The CONTRACTOR shall be paid per linear foot of abandoned boring in accordance with Section 1270.

2. Complete Well: The CONTRACTOR shall complete installation of the well to the depth obtained.

E. No drilling muds can be used for the construction of these wells.

3.3 Well Installation

A. The CONTRACTOR shall drill the borehole to permit the installation of the casing and perforated pipe assembly in a plumb and true line.

B. Casing and Perforated Pipe: The well casing shall be bell-joint schedule 80 PVC solvent welded and joined with ½” long screws, as indicated on the Drawings. The CONTRACTOR shall center the well casing and perforated pipe in the borehole. The CONTRACTOR shall maintain the well casing and perforated pipe vertically plumb during backfilling of the borehole.

Lengths vary, as indicated on the Drawings, and will be determined based on data obtained during drilling activities. Perforations are milled 0.020 slotted pipe as indicated on the Drawings.

C. Landfill Gas Collection Aggregate: To prevent bridging, the CONTRACTOR shall pour aggregate gradually and carefully into annular space to the design level above the top of the well screen, as determined by volume measurements and sounding with a weighted tape; sound enough so that placement is accurate to within 0.2 foot.

D. Bentonite Seal: The CONTRACTOR shall pour the bentonite gradually and carefully to the design level, as indicated on the Drawings, above the top of the gravel pack, as determined by volume measurements and sounding with a weighted tape.

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1. The CONTRACTOR shall place bentonite only when gas well collection piping installation is complete, including all CQC and CQA work.

2. The top of the bentonite seal shall be sounded to ensure that no bridging occurred during placement.

E. Clean Backfill: The CONTRACTOR shall add clean, silty backfill as shown on the Drawings no earlier than 1/2 hour following placing the bentonite seal.

F. The CONTRACTOR shall attach the appropriate fittings and/or wellhead as shown on the Drawings.

G. The CONTRACTOR shall connect the vertical gas well to the gas header pipe according to the Drawings.

H. The CONTRACTOR shall sound the completed wells with a COUNTY representative present, to confirm the well is constructed as specified.

I. The CONTRACTOR shall complete well installation activities in a timely fashion. Boring construction shall not be inactive for a period exceeding 18 hours.

3.4 Borehole Decommissioning

A. Abandonment: The CONTRACTOR shall determine the depth by sounding the boring to be abandoned. The well shall be abandoned by backfilling with clean, silty backfill at the direction of the ENGINEER. No submittals will be required. The CONTRACTOR shall be paid per linear foot of abandoned well in accordance with Section 1270.

B. Clean Backfill: The CONTRACTOR shall add clean, silty backfill to ground surface.

Kiefer Landfill 2022 Gas extraction wells and Piping Installation Vertical Wellhead Assembly with Gate Valve August 2022 Page 02650-1 SECTION 02650 (WELLHEAD ASSEMBLY)

SECTION 02650

WELLHEAD ASSEMBLY

A. The CONTRACTOR shall furnish all labor, materials, tools, supervision, transportation, equipment and incidentals necessary for the Wellhead Assembly used on this project. The work will be carried out as specified herein and in accordance with the General Conditions and Drawings.

1.2 Submittals

A. The following documentation shall be submitted by the CONTRACTOR to the ENGINEER for approval, prior to construction:

1. Manufacturer’s Installation and Operation Manual.

2. Manufacturer’s Warranty Information.

1.3 Quality Assurance

A. The equipment must have at least five years of proven landfill gas performance.

PART 2 – PRODUCTS

2.1 General Product Description

A. The LFG collection system wellheads shall be a 2-inch CES-Landtec Accu- Flo™ vertical wellhead assembly and shall consist of wellhead piping with gas flow measurement device, 2-inch flow control gate valve, gas temperature gauge port, quick connect gas sampling, static and impact pressure ports, flexible hose connector, PVC union disconnect, and dust cap. Wellhead piping and fittings shall be Schedule 80 PVC. Adapters shall be Elastomeric Polyvinyl Chloride.

B. The equipment shall be capable of withstanding the rigors of landfill gas recovery application, including internal high vacuum, weathering, and gas constituent and ultraviolet light exposure.

C. The wellhead shall be tight and leak free and shall be height adjustable in the field using adapter bushings.

D. The wellhead assembly shall be capable of being used with the CES-Landtec GEM-5000™ Gas Extraction Monitor incorporating all GEM™ monitoring functions or equivalent.

E. It is the intent of this Specification that the wellhead assembly shall be…