Golder, Golder Associates and the GA globe design are trademarks of Golder Associates Corporation A world of capabilities delivered locally CONSTRUCTION QUALITY ASSURANCE PLAN Phase 3 Final Cover and Stormwater Improvements Kiefer Landfill Sacramento, California Submitted To: Sacramento County Department of Waste Management and Recycling 9850 Goethe Road Sacramento, California 95827 Submitted By: Golder Associates Inc. 1000 Enterprise Way, Suite 190 Roseville, CA 95678 USA April 2016 Project No. 1536410 CONSTRUCTION QUALITY ASSURANCE PLAN
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Kiefer Landfill Sacramento, California CQA Plan.pdf · CONSTRUCTION QUALITY ASSURANCE PLAN Phase 3 Final Cover and Stormwater Improvements Kiefer Landfill Sacramento, California Submitted
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Golder, Golder Associates and the GA globe design are trademarks of Golder Associates Corporation
A world ofcapabilities
delivered locally
CONSTRUCTION QUALITY ASSURANCE PLAN
Phase 3 Final Cover and Stormwater Improvements Kiefer Landfill Sacramento, California
Submitted To: Sacramento County Department of Waste Management and Recycling 9850 Goethe Road Sacramento, California 95827 Submitted By: Golder Associates Inc. 1000 Enterprise Way, Suite 190 Roseville, CA 95678 USA April 2016 Project No. 1536410
3.4.2 Soil Cover Borrow Area ......................................................................................................... 12
3.4.3 Soil Cover Engineering Fill Placement .................................................................................. 12
3.4.4 Trenching and Backfilling ....................................................................................................... 12
3.5 Construction Surveys ................................................................................................................. 12
4.0 CONSTRUCTION QUALITY ASSURANCE FOR LFG COLLECTION AND CONTROL SYSTEM ....................................................................................................................................................... 13
The purpose of this Construction Quality Assurance (CQA) Plan is to describe the quality assurance
procedures to be used during construction of the Phase 3 (P3) Final Cover and Stormwater
Improvements at the Kiefer Landfill, Sacramento County, California. The primary goals of the quality
assurance program are to:
Determine if proper construction techniques, materials, and procedures are used
Determine if the intent of the construction documents and project design reports are met
Identify construction problems and provide a mechanism for resolution
Upon completion of construction, information generated through the CQA Plan will be used to prepare
a project construction certification report.
1.2 Document Format
The CQA Plan is presented in five sections. Section 1 is the introduction and presents the document
format, definitions and terms used throughout the document. Section 2 presents general
requirements of the quality assurance program and organization. Sections 3 and 4 present special
requirements for specific work items of the construction, including procedures such as materials
verification, test standards, testing frequencies, conformance and construction testing, sample
numbering and processing, and monitoring for each work item. Section 5 presents methods of
documentation and record-keeping.
All parties involved in the construction of P3 Final Cover and Stormwater Improvements should be
thoroughly familiar with this document, the Construction Drawings, and the Technical Specifications.
1.3 Definitions
Whenever the terms listed below are used, the intent and meaning will be interpreted as indicated.
ASTM - American Society for Testing and Materials
Construction Quality Assurance (CQA) – A planned and systematic series of observations and tests designed to provide adequate confidence that materials and services meet contractual and regulatory requirements
Construction Quality Assurance Consultant (CQA Consultant) - the monitoring firm responsible for implementation of the CQA program.
Construction Quality Assurance Monitor (CQA Monitor) – Site representative(s) of the CQA Officer responsible for documenting field observations and tests
Construction Quality Assurance Officer (CQA Officer) – The professional representative of the CQA Consultant responsible for planning, coordinating, and
implementing the CQA Plan. The CQA Officer must be a California registered civil engineer or certified engineering geologist as required in Section 20324(b)(2) of Title 27.
Contract Documents – The official set of documents issued by the Owner, which includes bidding requirements, contract forms, contract conditions, Technical Specifications, Construction Drawings, addenda, and contract modifications.
Construction Drawings – The official plans, profiles, typical cross sections, elevations, and details, as well as their amendments and supplemental drawings, which show the locations, character, dimensions, and details of the work to be performed. Construction Drawings are also referred to as the "plans."
Technical Specifications – The qualitative requirements for products, materials, and workmanship upon which the construction is based. Technical Specifications are also referred to as “Specifications.”
Contractor – The person or persons, firm, partnership, corporation, or any combination, private, municipal, or public, who, as an independent Contractor, has entered into a contract with the Owner.
County Construction Manager – Owner's representative on site, who is responsible for contract administration.
Design Engineer – The individuals or firms responsible for the design and preparation of the Contract Documents.
Earthwork – A construction activity involving the use of soil materials as defined in the Technical Specifications and Section 3 of this CQA Plan.
Excavation – Excavation of materials from areas identified on the Construction Drawings. The process may require exclusion of unsuitable materials.
Nonconformance – A deficiency in characteristic, documentation, or procedure that renders the quality of an item or activity unacceptable or indeterminate. Examples of nonconformance include, but are not limited to, physical defects, test failures, and inadequate documentation.
Soil Cover Layer – Vegetative soil layer placed as a final cover above the waste.
Owner – Sacramento County, Department of Waste Management and Recycling is the Owner/Operator of this landfill facility.
Procedure – A document that specifies or describes how an activity is to be performed.
Project Director – Owner's representative with overall project responsibility.
Project Documents – Contractor submittals, Construction Drawings, Record Drawings, Technical Specifications, shop drawings, construction quality control and quality assurance plans, safety plan, and project schedule.
Quality Assurance – A planned and systematic pattern of procedures and documentation designed to provide adequate confidence that materials or services meet contractual and regulatory requirements, and that these materials will perform satisfactorily in service.
Quality Control – Those actions that provide a means of measuring and regulating the characteristics of a material or service to comply with the requirements of the construction documents. Quality control will be performed by the Contractor, manufacturers, suppliers, and subcontractors.
Record Drawings – Drawings recording the constructed dimensions, details, and coordinates of the project (also referred to as "as-builts").
Surveyor – The individual or firm responsible for grade staking to establish required elevations construct the project in accordance with the Construction Drawings and Technical Specifications.
Testing – Verification that materials meet specified requirements by subjecting that material to a set of physical, chemical, environmental, or operating conditions.
Testing Laboratory – A laboratory capable of conducting the tests required by this CQA Plan and the Technical Specifications. Testing may be done by the same laboratory or by a separate soils testing laboratory and a geosynthetics testing laboratory.
USCS – Unified Soil Classification System (ASTM D2487).
4.0 CONSTRUCTION QUALITY ASSURANCE FOR LFG COLLECTION AND CONTROL SYSTEM
This section describes CQA procedures for the installation of the LFG related high-density
polyethylene (HDPE) pipe for the final cover system. HDPE pipe will be disconnected and re-
installed and existing LFG extraction wellheads will be extended as part of the project. The overall
goal of the LFG system control quality assurance program is to assure that proper construction
techniques and procedures are used and that the project is built in accord with the project
Construction Drawings and Technical Specifications.
The scope of work for construction of the LFG collection and control system includes:
Raising existing LFG extraction wells
Removal and re-Installation of HDPE piping for LFG and condensate collection
4.1 HDPE Pipe
HDPE pipe is used on this project to convey landfill gas and condensate/leachate to the blower/flare
facility. Proper installation of pipe is essential to ensure that the systems operate as intended. The
majority of the piping that is removed will been reinstalled upon completion of the final cover system.
Additional piping will be added as necessary to complete the project.
4.1.1 Delivery
During delivery, the CQA monitor should verify the following:
Equipment and procedures used to unload the pipe do not damage the pipe.
The pipe is stacked consistent with the manufacturer's recommendations.
Pipe size, length, and dimension.
All documentation required by the specifications has been received.
Each section is marked according to specification requirements, including pipe manufacturer, standard dimension ratio (SDR) size, ASTM designation, and date of manufacturer.
Any damaged or non-conforming pipe must be rejected and removed from the site or stored at a
location designated by the Project manager, separate from the accepted pipe. All pipe that does not
have proper manufacturer's documentation must also be stored at a separate location, until all
documentation has been received and approved.
4.1.2 Installation
During polyethylene pipe installation, the CQA Monitor shall observe and document that the
installation is in accordance with the Technical Specifications. The CQA monitor should verify:
Qualifications and certifications of HDPE pipe fusion weld operators
The handling procedures used do not damage the pipe or underlying materials, that the backfill is placed in accordance with the requirements of the Technical Specifications so as not to damage the
That indentations and deformation on the pipe are within the allowable limits.
Pipe segments are joined consistent with the manufacturer's recommended procedure
Pipe installation is performed with minimum amount of lifting and moving
Fittings are not used as the point of attachment for lifting
Correct location and installation of valves, flanges, monitoring ports, and other appurtenances
Correct operation of all valves
All open ends of installed pipe shall be temporarily capped when not being used, to prevent entry of animals or foreign substances
Loose material (shavings, soil, stones, etc.) are removed from the pipe before start-up
Contractor’s proper execution of pressure test procedures, and documentation of results
HDPE fusion will be per CSR PolyPipe Heat Fusion Joining Procedures EHMW PE4710, or
equivalent procedure. Qualification of all fusion operators will be by visual inspection and bend test
on three test samples of 1” wide x 12” long joint sections, from a test joint made in the largest size of
pipe to be used in the project (detailed procedure contained in CSR PolyPipe Specification TS-1021
or Driscopipe Heat Fusion Qualification Guide).
4.1.2.1 Joints and Connections
Monitoring shall include observation of the jointing and connection operations to verify that the
Contractor or Installer follows the Technical Specifications and the Pipe Manufacturer's
recommendations, verification that the pipes are clean when installed, and that perforated sections of
pipe are aligned properly prior to connection.
4.1.2.2 Non-destructive Testing
Monitoring shall include observation of any required testing of the pipe to verify conformance with the
Technical Specifications.
Pressure testing will be performed on the condensate piping and LFG collection piping as follows:
Initial visual inspection of all welds.
Second visual inspection of all welds and connections upon return to service to verify that there are no air leaks.
LFG quality testing will be performed by the system operator to verify leaks are not present.