2022-04-01_Kiefer_Landfill_Module_4,_Phase_2_CQA_Plan.pdf

Construction Quality Assurance Plan Module 4, Phase 2 Base Liner System

Kiefer Landfill

Submitted to County of Sacramento Department of Waste Management and Recycling 12701 Kiefer Boulevard Sloughhouse, California 95683

Prepared by

143E Spring Hill Drive Grass Valley, California 95945 www.geo-logic.com Project #AU21.1095

April 2022

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Table of Contents

1. Construction Quality Assurance

1.1 Introduction and Scope

1.2 Duties of CQA Personnel

1.3 Personnel Qualifications

1.3.1 CQA Officer

1.3.2 CQA Monitor

2. Meetings

2.1 General

2.2 Preconstruction Meeting

2.3 Daily Progress Meetings

2.4 Weekly Progress Meetings

2.5 Work Deficiency Meetings

3. Design Changes

3.1 Minor Design Changes

3.2 Major Design Changes

4. Earthwork

4.1 General

4.2 Soil Sampling

4.2.1 Sample Processing

4.2.2 Sample Numbering and Logging

4.2.3 Sample Tagging

4.3 Conformance and Construction Phase Testing

4.4 Excavation/Stockpiling

4.5 Engineered Fill Placement

4.6 Liner Subgrade Preparation

4.7 Anchor Trench Excavation and Backfilling

4.8 Excavation of the Existing Liner Termination

4.9 Gravel Drainage Layer

4.10 Soil Operations Layer (Base and Side Slope)

4.11 Rock Slope Protection and Stormwater Channels

4.12 Surveys and As-Builts

5. Geomembrane Quality Assurance

5.1 General

5.2 Shipping and Handling

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5.3 Geomembrane Conformance Testing

5.4 Geomembrane Placement

5.5 Geomembrane Test Welds

5.6 Seaming of Geomembrane

5.7 Extrusion Welding

5.8 Hot Wedge (Fusion) Welding

5.9 Nondestructive Testing of Geomembrane Seams

5.10 Vacuum Box Testing

5.11 Air Pressure Testing

5.12 Destructive Testing of Geomembrane Seams

5.13 Repairs to Geomembrane

5.14 Geomembrane Final Walk Through

5.15 Geomembrane Leak Detection Testing

6. Drainage Geocomposite Quality Assurance

6.1 General

6.2 Shipping and Handling

6.3 Geocomposite Conformance Testing

6.4 Geocomposite Installation

7. Geosynthetic Clay Liner (GCL) Quality Assurance

7.1 General

7.2 Shipping and Handling

7.3 GCL Conformance Testing

7.4 GCL Installation

7.4.1 GCL Panel Placement

7.4.2 Field Seaming and Repairs

7.5 GCL Acceptance

8. Geotextile Quality Assurance

8.1 General

8.2 Geotextile Shipping and Handling

8.3 Geotextile Conformance Testing

8.4 Geotextile Installation

8.5 Geotextile Acceptance

9. HDPE Pipe Quality Assurance

9.1 General

9.2 Delivery

9.3 Installation

10. Work Deficiencies

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11. Documentation

11.1 Daily Records

11.2 Observation and Test Data Sheets

11.3 Weekly Progress Reports

11.4 Construction Difficulty Reports

11.5 Final Report

11.6 As-Built Drawings

List of Tables

1 Earthwork Conformance and Construction Testing

List of Appendices

A Geomembrane Leak Detection Testing

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Definitions Wherever the terms listed below are used in this CQA, their intent and meaning shall be interpreted as defined in this section.

ASTM - ASTM International (formerly American Society for Testing and Materials), 100 Barr Harbor Drive, PO Box C700, West Conshohocken, Pennsylvania, 19428-2959; also, the numerical designation of a standard specification, test method, or practice established by ASTM International.

Caltrans - Caltrans (aka California Department of Transportation), 1120 N Street, P.O. Box 942873, Sacramento, California 94273-0001; also, the numerical designation of a standard specification, test method, or practice established by Caltrans.

Contract Documents - The official document set issued for the project, including bidding requirements, contract forms, contract conditions, Construction Drawings, Construction Specifications, addendums and contract modifications.

Contractor - A person or persons, firm, partnership, corporation, or combination, whether private, municipal, or public, who, as an independent contractor, has entered into a contract with County to perform the construction activities for the project. This includes but is not limited to the earthwork contractor(s), geosynthetic installer(s), or their subcontractor(s).

Construction Completion Report - Report to be prepared at the completion of construction by the CQA Engineer/Officer that documents the as-built conditions and record drawings as discussed further in this CQA Plan.

Construction Drawings - The official plans, profiles, cross-sections, elevations, notes, and details, as well as their amendments and supplemental drawings, showing the locations, character, dimensions, and details of liner construction and grading.

Construction Manager - The designated representative of the County on the site, responsible for construction contract administration.

Construction Quality Assurance - A planned series of observations and tests to verify and document that quality control functions have been performed adequately and to assess compliance with contract drawings.

Construction Quality Assurance Consultant (CQA Consultant) - The party, independent from County or Contractor, that is responsible for observing and documenting activities related to the

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Construction Quality Assurance (CQA) Laboratory - A laboratory capable of conducting materials testing required by this CQA Plan.

Construction Specifications - The official quality requirements for products, materials, and workmanship upon which the design and construction of the project are based. The Construction Specifications are on the plans and in the Technical Specifications document.

CQA Engineer/Officer - A civil engineer, registered in the State of California as required by 27 CCR 20324(b)(2), who is responsible for observing, verifying, and documenting the construction and for preparing, signing, and sealing the Construction Completion Report.

CQA Monitor - A designated site representative of the CQA Engineer responsible for observing and documenting field conditions and tests.

County/Owner – County of Sacramento, Community Services, Department of Waste Management and Recycling is the Owner/Operator of this facility (DWMR).

Daily Report - A record of construction progress prepared by the CQA monitor which documents construction on a daily basis as outlined in this CQA Plan.

Design Engineer - The individual(s) or firm(s) responsible for designing the liner and preparing the Construction Drawings and Construction Specifications, either by or under the direct supervision of a civil engineer registered in the State of California. The Design Engineer for this project is Geo-Logic Associates, Inc., 143E Spring Hill Drive, Grass Valley, California 95945.

Earthwork - Work performed by the Contractor using soil or soil-like materials, including (but not limited to) excavation, hauling, stockpiling, general fill and compacted earth fill.

Engineer - The County and/or his/her designee.

Excavation - The removal of soil, soil-like material, and rock from in-place masses within areas identified on the Construction Drawings for excavation. Excavation may include the exclusion of unsuitable materials and preparation of the subgrade.

Fabricator – Company or manufacturer responsible for joining or prefabricating in a factory or warehouse individual manufactured components together.

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Geosynthetic Clay Liners (GCL) - is a relatively thin layer of processed clay (typically bentonite) fixed between two sheets of geotextile or bonded to a geomembrane.

Geomembrane - A polymeric sheet material that is impervious to liquid, also referred to as flexible membrane liner, membrane, or liner.

Geotextile - Woven or nonwoven sheet synthetic fabric manufactured for use as a cushion, separator, or reinforcement in geotechnical applications.

Geocomposite – Two or more geosynthetics materials bonded together. Typically, two geotextile fabrics bonded to a geonet core for drainage purposes.

Geoelectric Leak Location Consultant – Consultant with specific expertise in performing electric leak location surveys on exposed or covered geomembrane.

GSI - Geosynthetic Institute.

Installer – The Installer is responsible for proper installation of the geosynthetic components in accordance with the project drawings and specifications. The Installer may be affiliated with the Manufacturer.

Manufacturer - The Manufacturer(s) is responsible for production of the geosynthetic components outlined in this plan. The Manufacturer may be affiliated with the Installer. Each Manufacturer must pre-qualify that they are able to produce material that meets the requirements of the Project Specifications.

Nonconformance - A deficiency in characteristic, documentation, or procedure that renders the quality of an item or activity unacceptable or indeterminate, including (but not limited to) physical defects, test failures, failure to conform to the requirements of the Construction Drawings or Construction Specifications, or inadequate documentation.

Procedure - A document that specifies or describes how an activity is to be performed.

Project Document - Any document, either required or incidental, prepared to further the construction of the liner, including (but not limited to) Contractor submittals, Construction Drawings, Construction Specifications, Technical Specification, Record Drawings, shop drawings, construction quality control and quality assurance plans, safety plans, and project schedules.

Quality Assurance - A planned and systematic program of procedures and documents to show that items of work or service meet the requirements of the Construction Drawings and

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Construction Specifications. Quality assurance does not include quality control, and will be performed by the CQA Engineer, acting through the CQA Monitor when appropriate.

Quality Control - Actions that provide a means of measuring and regulating the characteristics of items of work or service so that they comply with the requirements of the Construction Drawings and Construction Specifications. Quality control shall be performed by the Contractor, Subcontractors, manufacturers, and suppliers, as appropriate.

Record Drawings - Drawings recording the dimensions, details, coordinates, and characteristics of the project as they were actually constructed; informally referred to as "as-builts".

RWQCB – California Regional Water Quality Control Board, Central Valley Region.

Surveyor - The individual(s) or firm(s) responsible for locating project features, staking grades to establish required elevations, and measuring construction quantities as needed to carry out; and produce the data on which the record drawings are based and payment quantities are estimated. All such work being performed by or under the continuous supervision of a licensed land surveyor registered in the State of California.

Suitable Soil - Soil excavated from the construction limits that meets material property requirements presented in the Specifications for a given application. At the Kiefer Landfill, it often applies to soil that meets the requirements for final cover material.

Testing - Verification that an item meets specified requirements by subjecting that item to a set of physical, chemical, environmental, or operating conditions and recording the associated physical state or response of the item.

USCS - Unified Soil Classification System, as defined in ASTM D 2487, Standard Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System) (if laboratory data are available) or ASTM D 2488, Standard Practice for Description and Identification of Soils (Visual-Manual Procedure) (if laboratory data are unavailable).

Unsuitable Soil - Soil excavated from the construction limits that do not meet the requirements of sand and/or suitable soil material property Specifications for a given application. At the Kiefer Landfill, it often applies to soil that does not meet the requirements for final cover material.

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1. Construction Quality Assurance

1.1 Introduction and Scope

This Construction Quality Assurance (CQA) Plan describes the CQA requirements for the Module 4, Phase 2 Base Liner System project at the Kiefer Landfill owned and operated by County of Sacramento, Department of Waste Management and Recycling (County). CQA refers to the duties of a third party CQA Consultant hired by the County to monitor, inspect, and evaluate materials and workmanship during construction. The CQA activities document the compliance of the Contractor with the Construction Drawings (Drawings) and Construction Specifications (Specifications) for the construction which has been approved by the California Regional Water Quality Control Board (RWQCB).

The overall goal of this CQA Plan is to assure that proper construction techniques and procedures are used and that the project is built in accordance with the project Drawings and Specifications. The intent is to identify and define problems that may occur during construction and to observe that these problems are corrected before construction is complete. A written final report prepared by the CQA Consultant will be prepared summarizing the construction activities and observing that the installation was performed in general accordance with the project Drawings and Specifications.

All quality assurance activities shall be conducted in accordance with this CQA Plan, and with the Drawings and Specifications. Where there is a discrepancy, the Specifications shall govern unless otherwise specified by the County and approved by the RWQCB. The CQA Monitor shall observe all field installation activities as described in this CQA Plan. The CQA Consultant shall be responsible for ensuring that the proper number of personnel are onsite and capable of observing construction activities as described in this document. The CQA Monitor shall be present during all phases of construction that require CQA observation. Documentation shall meet the requirements of this CQA Plan and the Specifications.

1.2 Duties of CQA Personnel

It is the duty and responsibility of the CQA Consultant to implement the elements of this CQA Plan in order to ensure that the construction and installation of the composite liner system at the site is performed in accordance with the approved Drawings and Specifications, Title 27 of the California Code of Regulations, and 40 CFR 258 (Subtitle D). The CQA personnel shall make every effort to communicate in an efficient and effective manner to the Contractor’s

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The CQA Consultant is not in a position to direct construction activities, but is encouraged to give advice to the Contractor, its employees or the County on items which may improve the quality or speed progress of the construction. As described previously, for the purposes of consistency with the Specifications, the County may also be referred to as DWMR.

The CQA Consultant and its representatives shall make every effort to furnish test results to the Contractor in a prompt manner. The representatives of the CQA Consultant shall report to the County any nonconformance items, which cannot be resolved promptly.

The CQA monitor will be on site as required during the construction project to ensure that all aspects of construction are monitored and documented.

1.3 Personnel Qualifications

1.3.1 CQA Officer

The CQA Officer will have formal academic training in civil engineering or a closely related discipline and will be a registered civil engineer or certified engineering geologist in the State of California. The CQA Officer will have experience in earthworks construction, landfill design and construction, and geomembrane and leachate collection system installations. The CQA Officer will have practical technical and managerial experience that will allow the CQA Plan to be properly implemented. The CQA Officer must be able to communicate effectively with the County personnel and the Contractor so that there will be a clear understanding of construction activities and the CQA Plan.

1.3.2 CQA Monitor

The CQA Monitors will work directly under the responsible charge of the CQA Officer. The CQA Monitors will have formal training and practical experience in inspecting and testing earthworks construction, geomembrane installations, and leachate collection system installations, including conducting and recording inspection activities, preparing daily reports, and performing field testing. In addition, knowledge shall be required of the specific field practices and construction techniques for landfill liner construction and all codes and regulations involving material handling, observation of testing procedures, equipment, and reporting procedures.

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2. Meetings

2.1 General

Throughout the entire construction and installation of the system, close communication between all parties involved with the project is essential. In order to coordinate activities between the County, CQA Consultant, and Contractor, as well as set up proper lines of authority and reporting, meetings shall be held before and during construction. The type and purpose of meetings to be held for this project are described in this section.

2.2 Preconstruction Meeting

A preconstruction meeting shall be held, at the County’s request, prior to project start-up. The parties that shall attend this meeting are the County, Contractor, and CQA Consultant. The purpose of this meeting is to:

Identify key personnel.

Review the project Drawings, Specifications, and CQA Plan.

Review project tasks and responsibilities.

Review project schedule.

Review lines of communication and authority.

Review reporting and documenting procedures.

Review testing equipment and test methods.

Review protocol for submittal of CQA conformance testing data sheets.

Conduct a site inspection to review work areas, lay-down areas, stockpile areas, access roads, and related project issues.

The CQA Consultant or the County’s Representative shall document the preconstruction meeting and copies shall be provided to all attendees and other parties requested by the County. Preconstruction meeting documentation shall become part of the project documents.

2.3 Daily Progress Meetings

A progress meeting shall be held before the start of each construction shift. The daily progress meetings shall be attended by the CQA Monitor and the Contractor. The purpose of this meeting shall be to:

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Review the proposed activities scheduled by the Contractor for the day.

Discuss any problems or deficiencies that have arisen during construction.

Review the results of any test data.

Discuss the Contractor's deployment of personnel and equipment.

Review the previous day's activities including the effectiveness of procedures taken to alleviate any deficiencies.

All progress meetings shall be documented by the CQA Monitor on his daily field construction inspection report.

2.4 Weekly Progress Meetings

Progress meetings will be held at the beginning or end of each week to review the previous week's activities or progress, discuss present and future work, and discuss any current or potential construction problems. At a minimum the CQA Monitor, County representative, the Contractor, and all active subcontractors shall attend. If necessary, the CQA Officer and/or Design Engineer shall also attend. All weekly progress meetings will be documented by the CQA Monitor who will transmit minutes by the end of the second working day to all parties.

2.5 Work Deficiency Meetings

As needed, meetings shall be held to discuss specific problems or deficiencies that occur during construction that cannot be easily resolved. Work deficiency meetings shall be attended by the CQA Monitor, CQA Officer, the County, and the Contractor and Design Engineer, if necessary.

The purpose of these meetings is to:

Identify the nature and extent of the problem.

Discuss the means necessary to correct the deficiency or problem.

Provide a solution to the problem and determine how the corrective action shall be implemented.

All work deficiency meetings will be documented by the CQA Consultant or the County’s Representative who will transmit minutes to all attending parties. Deficiency meeting documentation shall become part of the project documents.

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3. Design Changes

3.1 Minor Design Changes

Minor changes to the Drawings and Specifications may be necessary to maintain or enhance quality during the project or to make adjustments to unforeseen field conditions. Minor changes must be approved by the Engineer.

Procedures for providing minor changes include the following:

The need for a design change may become apparent during the course of construction of the project and a request for a change may be initiated by any individual associated with the project.

All proposed design changes must be approved by the Engineer and submitted to the CQA Officer with necessary documentation supporting the change for approval. All design changes must meet the intended quality and technical requirements of the design.

Approved changes will be distributed to the County, CQA Monitor, CQA Officer, Contractor, Geosynthetics Installer, applicable subcontractor(s), and the RWQCB as required.

Minor changes do not include changes that decrease the environmental protection of the unit such as decreasing the number or thickness of liners, decreasing the number of sumps, changing the synthetic liner materials, etc.

3.2 Major Design Changes

Major changes to the Drawings and Specifications are unlikely to occur but may become necessary during the course of construction. Major changes may include elimination of landfill design components and drainage features and addition or changes to liner components and the extent of liner installation. The following procedures will be implemented for all major changes:

A special meeting will be scheduled immediately with the RWQCB and LEA as necessary to discuss the need for the change.

County and Engineer will both attend the meeting to present the basis for the change.

Requested changes and supporting documentation will be provided at the meeting.

Major changes will not be implemented without the express written approval from pertinent regulatory agencies (e.g. RWQCB and/or LEA).

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Copies of approved changes will be distributed to County, Engineer, CQA Monitor, CQA Officer, Contractor, Geosynthetics Installer, applicable subcontractor(s), and pertinent states and local regulatory agencies.

4. Earthwork

4.1 General

This section outlines the requirements for earthwork operations for the construction of the landfill liner system. The Contractor shall excavate soils and prepare the liner subgrade as necessary to achieve the grades set forth within the Drawings and Specifications. Earthwork includes but is not limited to:

Excavation

Engineered fill

Liner subgrade preparation

Anchor trench excavation and backfill

Gravel drainage layer

Excavation of the existing liner termination

Soil operation layer placement

HDPE pipe installation

Rock slope protection and stormwater channel construction

Specifically excluded from this section are the geomembrane installation, GCL installation, geotextile, and geocomposite installation, which are addressed within later sections of this CQA Plan.

The CQA Monitor shall observe that the Contractor has conducted all surveying and as-built drawing preparation as required by the Specifications. Where called for in this CQA plan or in the Specifications, the following test methods may apply:

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Standard Title and Test Description

ASTM D1556 Density and unit weight of soil in place by the sand-cone method

ASTM D698 Laboratory compaction characteristics of soils using Standard Effort ("Standard Proctor" method)

ASTM D1557 Laboratory compaction characteristics of soils using Modified Effort ("Modified Proctor" method)

ASTM D2216 Laboratory determination of water (moisture) content of soil and rock ASTM D4643 Determination of water (moisture) content of soil by the microwave oven method ASTM D2434 Permeability of granular soils (constant head)

ASTM D5084 Measurement of hydraulic conductivity of saturated porous materials using a flexible wall permeameter

ASTM D4318 Liquid limits, plastic limit, and plasticity index of soils (Atterberg limits) ASTM C136 Sieve analysis of fine and coarse aggregate ASTM D2487 Standard classification of soils for engineering properties ASTM D2488 Standard practice for description and identification of soils ASTM D4220 Standard practices for preserving and transporting soil samples

ASTM D6836 Determination of the Soil Water Characteristic Curve for Desorption using a Hanging Column, Pressure Extractor, Chilled Mirror Hygrometer, and/or Centrifuge.

ASTM D6938 In-Place Density and Water Content of Soil and Soil Aggregate by Nuclear Methods ASTM D854 Specific Gravity of Soils ASTM D6913 Particle Size Distribution (Gradation) of Soil using Sieve Analysis ASTM D2937 Standard Test Method for Density of Soil in Place by the drive Cylinder Method

4.2 Soil Sampling

4.2.1 Sample Processing

The CQA Monitor is responsible for the timely processing and testing of soil samples. The CQA Officer must determine which samples will be tested on-site and which will be tested off-site.

This determination will be made based on available manpower, available equipment, complexity of test, and time available to determine results. For expediency, samples tested off-site must be shipped the same day as they are obtained.

As test data is obtained from the on-site and off-site laboratories it must be summarized in the form it will appear in the CQA report.

4.2.2 Sample Numbering and Logging

The CQA Monitor must maintain a sample numbering system for all soil samples obtained for the project. These samples include those obtained prior to construction for conformance or

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Documentation of soil sampling must be summarized in the form it will appear in the CQA report, and be maintained throughout the project. The log must include soil sample numbers beginning with (0001) and proceeding sequentially. No sample number can be repeated, and re-tests of a sample that does not meet specified requirements must be given the original number with a letter suffix (i.e., re-tests for a sample 0021 not meeting specified requirements would be 0021A, 0021B, etc.). Information contained in the master soil sample log must include:

Sample number

Test(s) being performed

Date the sample was obtained

Name of CQA Monitor that obtained the sample

Location that the sample was obtained, such as a stockpile, a fill, a borrow area, etc.

Location testing will take place (on-site vs. off-site)

Date sample sent off-site

Date test results were completed on-site or received from off-site

Name of CQA Monitor that performed the on-site testing

Comments about the test results, such as pass / fail information

4.2.3 Sample Tagging

The CQA Monitor must maintain the identification of all samples obtained throughout the project from the time the sample is obtained to the time testing is completed. The monitor must place an identifying tag on the sample or mark the sample container with the sample number immediately upon sampling. The tag or identifying container must remain with the sample throughout processing, testing and storage. The tag or container must have the following information:

Sample number

Soil material type

Project name and project number

Name of CQA Monitor that obtained the sample

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The date the sample was obtained

4.3 Conformance and Construction Phase Testing

Table 4-1 establishes test frequencies for earthwork CQA testing. It includes classification and conformance tests that must be performed prior to soil installation to assure soil materials meet quality standards established in the technical specifications. In addition, Table 4-1 outlines post-construction testing to assure installed materials meet specified requirements.

The test frequencies listed establish the minimum number and intervals of required tests.

Additional testing must be conducted whenever work or materials are suspect, marginal, or of poor quality. Extra testing may also be performed to provide additional data for engineering evaluation. Any re-tests performed as a result of a failing test cannot contribute to the total number of tests performed in satisfying the minimum test frequency.

Table 4-1. Earthwork Conformance and Construction Testing

Required Tests ASTM Designation Test Frequency

Engineered Fill Conformance Testing Identification and Classification of Soil Type D2488/D2487 1 / 10,000 cy Sieve Analysis D6913 1 / 10,000 cy Moisture / Density Relationship D1557 1 / 10,000 cy Engineered Fill Construction Testing Identification and Classification of Soil Type D2488/D2487 1 / 10,000 cy Sieve Analysis D6913 1 / 10,000 cy Density, Nuclear Method D6938 1 / 2,500 cy Moisture Content, Nuclear Method D6938 1 / 2,500 cy In Place Density Verification (Sand Cone Method or Drive Cylinder Method) D1556/D2937 1 / 20 nuclear tests

Moisture Content Verification D2216 1 / 20 nuclear tests Liner Subgrade Construction Testing Moisture / Density Relationship D1557 1 / material type Density, Nuclear Method D6938 1 / 10,000 sf Moisture Content, Nuclear Method D6938 1/ 10,000 sf Observe compacted subgrade for yielding under equipment load N/A Continuous

Gravel Drainage Layer Conformance Testing

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Required Tests ASTM Designation Test Frequency

Gradation C136 1 / material type Identification and Classification of Soil Type D2487, D2488 1 / material type Hydraulic Conductivity D2434 1 / material type Gravel Drainage Layer Construction Testing Gradation D6913 1 / 5,000 cy Identification and Classification of Soil Type D2487, D2488 1 / 5,000 cy Hydraulic Conductivity D2434 1 / 5,000 cy Anchor Trench Backfill Conformance Testing Identification and Classification of Soil Type D2487/D2488 1 / material type Sieve Analysis D6913 1 / material type Moisture / Density Relationship D1557 1 / material type Anchor Trench Backfill Construction Testing

Density, Nuclear Method D6938 1/50 lineal feet of trench

Moisture Content, Nuclear Method D6938 1/50 lineal feet of trench

Oven Moisture Content Verification D2216 1/20 nuclear tests Soil Operations Layer (Base and Side Slope) Conformance Testing

Gradation D6913 1 / 10,000 cy Identification and Classification of Soil Type D2487, D2488 1 / 10,000 cy Permeability (Side Slope only) D2434 1/ 20,000 cy Soil Operation Layer (Base and Side Slope) Construction Testing

Gradation D6913 1 / 10,000 cy Identification and Classification of Soil Type D2487, D2488 1 / 10,000 cy Permeability (Side Slope only) D2434 1/ 20,000 cy Aggregate Base Conformance Testing Moisture / Density Relationship D1557 1 / material type Gradation C136/D6913 1 / material type Identification and Classification of Soil Type D2487, D2488 1 / material type Aggregate Base Construction Testing Density, Nuclear Method D6938 1/100 cy placed Moisture Content, Nuclear Method D6938 1/100 cy placed Oven Moisture Content Verification D2216 1/20 nuclear tests

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4.4 Excavation/Stockpiling

The excavated soil materials shall be stockpiled in the identified stockpiles as directed by the CQA Monitor or County Representative. The CQA Monitor will visually monitor the excavation to identify soil types and confirm the soil types by sampling and visual classification. The CQA Monitor will notify the Contractor of visual classification and identify the associated stockpile (sand, suitable, unsuitable, etc.) that should receive the excavated soil. The Monitor shall observe that the stockpiles conform to the requirements of the Specifications. Excavated waste shall be placed at the working face of the landfill.

4.5 Engineered Fill Placement

The CQA Monitor shall observe that the engineered fills are placed to the lines and grades shown on the Drawings. This work also includes the construction of all berms, drainage structures, roads, and other engineered fills within the construction area.

Prior to fill placement, the CQA Monitor shall verify that all demolition, clearing, grubbing, and stripping has been performed by the Contractor in accordance with the appropriate sections of the project Specifications, this includes verifying that existing slopes over 5 feet tall with inclinations greater than 5:1 (H:V) have been properly benched and fill keys have been prepared.

The CQA Monitor shall observe fill placement and perform the necessary field and laboratory testing to ensure that materials are compacted at the specified moisture content and to the minimum density specified. The CQA Monitor shall observe the placement of engineered fill material in loose lifts not exceeding the thickness stated in the Specifications. The CQA Monitor shall observe that each lift of engineered fill receives an adequate number of passes by compaction equipment. Tests to be performed and their frequency are provided in Table 4-1.

4.6 Liner Subgrade Preparation

Prior to liner subgrade preparation, the CQA Monitor shall verify removal of large or sharp materials and verify that surface is suitable for liner subgrade. Liner subgrade proof-rolling, smooth-drum compaction, and other preparation activities shall be observed by the CQA Monitor as required by the Specifications and this Plan. The CQA Monitor shall observe the subgrade compaction and perform the necessary field and laboratory testing to ensure that materials are compacted at the specified moisture content and to the minimum density specified and that this condition is maintained. The completed liner subgrade for the synthetic liner shall be inspected and tested by the CQA Monitor, Contractor, and/or Geosynthetics

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Installer (Installer) to ensure that it will provide a firm and relatively smooth base for construction of the lining system in accordance with the Construction Drawings and Specifications. Any areas observed to be excessively soft or having excessive moisture during proof-rolling shall be excavated and reworked or removed and suitable materials placed by the Contractor in accordance with the project Specifications. At the conclusion of the liner subgrade preparation, the CQA Monitor shall record on an appropriate form that the subgrade is acceptable to the Installer for placement of the overlying geosynthetic materials.

4.7 Anchor Trench Excavation and Backfilling

The CQA Monitor shall observe that the anchor trenches are excavated to the approximate lines and grades shown on the Drawings. The CQA Monitor shall observe trench excavation to ensure it has been excavated only the distance required to carry out all geosynthetics installation in an expeditious manner. The CQA Monitor shall observe that the leading edges of the anchor trenches are rounded to minimize sharp bends in the liner material.

The CQA Monitor shall observe the backfill compaction and placement of soil in lifts to ensure that the work is performed in accordance with the Drawings and Specifications. The CQA Monitor shall observe that the placement and compaction techniques employed by the Contractor to ensure that any damage (if it occurs) to the liner and other geosynthetics component is recorded and repaired as necessary. Any damage to the synthetic materials shall be immediately repaired in accordance with this CQA Plan and the Specifications. The CQA Monitor shall test the backfill materials in accordance with Table 4-1. The CQA Monitor shall ensure that all areas with failing tests are reworked in accordance with the Specifications until passing results are obtained.

4.8 Excavation of the Existing Liner Termination

The CQA monitor shall observe the exposing existing module liner at tie-in locations to ensure that the work is performed with caution and in accordance with the Drawings and Specifications.

The contractor shall be responsible for the repair of any damage that occurs while exposing and tie-in to the existing liner. All repairs shall be recorded and observed by the CQA Monitor.

4.9 Gravel Drainage Layer

The CQA Monitor shall verify that no material is placed until the underlying components and materials and necessary pipes/structures have been installed and approved by the CQA Monitor.

The CQA Monitor shall be present at all times during placement and spreading of the gravel

GLA Project #AU21.1095.00 | Kiefer Landfill Module 4, Phase 2 CQA Plan.docx 13 materials. The CQA Monitor shall verify that the placement of the gravel drainage layer is in accordance with the Specifications that include:

Review of relevant submittals.

Sampling and testing of gravel materials for all layers in accordance with the Specifications and Table 4-1.

Verifying that underlying geosynthetic installations and testing are completed, certified and accepted before material installation.

Verifying thickness of completed work.

Verifying that placement and spreading of materials do not damage underlying components such as piping and geosynthetics, and if damaged, repaired or replaced and tested in accordance with the Specifications.

The Contractor shall schedule placement of the gravel drainage layer material during cooler parts of the day in the event of warm weather to avoid placement of materials when the liner is wrinkled. All observed damages shall be recorded by the CQA Monitor and their location clearly marked for scheduled repair. The CQA Monitor shall observe the placement of the gravel drainage layer material to ensure that the Contractor follows the procedures described in the Specifications.

4.10 Soil Operations Layer (Base and Side Slope)

No soil operations layer material shall be placed until the synthetic liners have been installed and approved by the CQA Monitor. The CQA Monitor shall obtain samples and perform conformance testing on the soil operations layer materials in accordance with the Specifications prior to installation. The CQA Monitor shall monitor the soil screening and confirm the side slope soil operations layer meets the required permeability.

The CQA Monitor and CQA Officer shall review the Contractor’s list of proposed equipment and his description of the construction methods to place the soil operations layer over the geosynthetic materials in accordance with the Specifications.

The CQA Monitor shall continuously observe placement of the soil operations layer so that no materials are placed over wrinkles in the underlying geosynthetics. The thickness of the soil operation layer shall also be observed to ensure compliance with the Specifications.

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The Contractor shall schedule placement of the soil operations layer material during cooler parts of the day in the event of warm weather to avoid placement of materials when the liner is wrinkled. All observed damages shall be recorded by the CQA Monitor and their location clearly marked for scheduled repair. The CQA Monitor shall observe the placement of the soil operations layer material to ensure that the Contractor follows the procedures described in the Specifications.

The CQA Monitor shall test the soil operations layer materials during placement in accordance with Table 4-1.

4.11 Rock Slope Protection and Stormwater Channels

Prior to and during Rock Slope Protection and Stormwater Channel construction, the CQA Monitor shall:

Review product submittals and provide visual observation and documentation that the rock slope protection products in are in accordance with the requirements outlined in the Drawings and Specifications.

Verify that construction of rock slope protection and stormwater channels are in accordance with the Drawings and Specifications.

Verify that ditches are constructed to the alignments, slopes, flow line elevations, and dimensional cross-sections shown on the Drawings.

Verify that any fills necessary for the construction of the stormwater channels are tested in accordance with the frequencies and requirements for engineered fill, as specified in Table 4-1 and in the project Specifications.

Verify that the geotextile separator is installed on the graded subgrade in accordance with the Drawings and Specifications and Section 8 of this Plan.

Verify that the rock slope protection materials are placed to the approximate lines and grades shown on the Drawings.

4.12 Surveys and As-Builts

The CQA Officer shall review as-built survey information to confirm that minimum design thicknesses and grades are achieved prior to placement of any additional material over the prepared subgrade and LCRS drainage gravel. Confirm that the specified as-built survey grid is used to confirm minimum thicknesses and lines and grades of finished surfaces. Confirm that

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5. Geomembrane Quality Assurance

5.1 General

This section sets forth the requirements for the CQA testing and observation requirements for installing the geomembrane materials detailed on the Drawings and Specifications. This work includes the manufacturer's QC testing, conformance testing, shipping and handling, deployment, seaming, repairs, and non-destructive and destructive testing of the geomembrane liner. The Contractor shall furnish submittals in compliance with this Plan and conditions of warranty prior to construction for review by the CQA Officer and CQA Monitor.

5.2 Shipping and Handling

The Contractor shall provide a copy of the QC certificates for production of all of the geomembrane manufactured for this project prior to construction for review by the CQA Monitor and CQA Officer. The certificate of compliance for the geomembrane must be received prior to installation as required by the Specifications. Materials shall be delivered to the site only after the CQA Consultant receives and approves the required submittals.

The Contractor is responsible for the transportation, off-loading and storage of the geomembrane. The materials shall be packaged and shipped by appropriate means so that no damage is caused and shall be delivered to the site only after the CQA Monitor receives and approves the required submittals and conformance testing results. Off-loading shall be performed in the presence of the CQA Monitor and any damage during off-loading shall be documented. The CQA Monitor shall keep an inventory log of all geomembrane delivered to the site on the appropriate form for review by the CQA Officer.

Damaged materials shall be separated from undamaged materials until the CQA Monitor and CQA Officer determine proper disposition of the material. Final authority on the determination of damage shall be the CQA Monitor. The Contractor shall replace damaged or unacceptable material at no cost to the County.

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5.3 Geomembrane Conformance Testing

After production, the geomembrane shall be sampled for conformance testing by a third party geosynthetics laboratory. Sampling shall be performed at the manufacturing plant by the CQA Monitor, the third party geosynthetics laboratory, or upon arrival at the site. One geomembrane sample shall be obtained for every 100,000 square feet produced per lot. The CQA Monitor shall identify the roll numbers of the geomembrane that are tested for conformance on the inventory log of geomembrane received. The samples shall be delivered to the geosynthetics laboratory to conduct specified tests to assess whether the geomembrane properties conform to the requirements given in the Specifications. The CQA Officer shall review all test results and report any non-conformance test results to the Contractor and the CQA Monitor. Third party geosynthetics testing shall be performed by a GSI accredited laboratory.

Conformance samples shall be collected across the entire width of the roll, but shall not include the first three feet of the roll. The conformance samples shall be three feet wide by the roll width in length. Each sample shall be marked with the project name, Manufacturer's name and product identification, lot number, roll number, and type (HDPE, LLDPE, 60-mil, double-textured, single-textured, etc.). In event that sampling is necessary at the site, the Contractor shall provide the personnel and equipment to obtain the sample in the presence of the CQA Monitor. No material shall be deployed until passing conformance values are obtained by the CQA Monitor.

The conformance testing shall include the following parameters:

Thickness (ASTM D5994)

Sheet Density (ASTM D792 or ASTM D1505)

Tensile Properties (ASTM D6693)

Carbon Black (ASTM D1603)

Carbon Dispersion (ASTM D5596)

Asperity Height (ASTM D7466)

Interface Shear (ASTM D5321/D6243)

Required interface shear testing is described in Section 02778 of the Specifications. The Specifications describe to requirements for sampling, sample labeling, test configurations, normal loading, and all other testing specifics. Interface shear testing is performed per ASTM D5321 or D6243 requirements.

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5.4 Geomembrane Placement

Prior to placing the geomembrane panels, the Contractor and CQA Monitor shall observe that the GCL has been properly installed, finished, and accepted. Once the GCL has been approved and accepted, deployment of the geomembrane may begin. The Contractor's QC Technician shall assign and mark each panel with a unique identification number that shall be used by all parties. The CQA Monitor shall record the placement of each panel on a geomembrane panel deployment log form to be reviewed by the CQA Officer. The CQA Monitor shall observe that the Contractor has provided sufficient slack in the geomembrane to allow for contraction due to cold temperatures. The CQA Monitor shall record the ambient temperatures during seaming operations. As the geomembrane panels are deployed in the field, the CQA Monitor shall observe and observe and document the following:

That the Installer completes the Subgrade Acceptance form.

That any underlying geosynthetics have been repaired and approved as necessary.

That the equipment used to transport and deploy the geomembrane does not damage the geomembrane or the GCL.

That there are no significant defects present in the sheet. Small defects shall be marked, along with the type of repair required (extrudate, patch, etc.) and tracked in the repair log.

That the sheet is not deployed under adverse weather conditions such as fog, rain, high winds, or extreme temperatures.

That the equipment and deployment methods do not cause excessive wrinkling of the geomembrane and that the sheet is not dragged along a rough surface. If the liner is dragged, the CQA Monitor shall inspect the underside of the material for damage.

Geomembrane that is scored beyond reasonable repair effort shall be rejected.

That personnel do not engage in activities that could damage the geomembrane.

That the Contractor's QC personnel properly record identification information including roll number, panel number, seam number, date, etc.

That the Contractors QC personnel prepare an as-built panel layout drawing.

The CQA Monitor shall record all of the above information in daily reports and log sheets and shall inform all parties of any deviations.

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5.5 Geomembrane Test Welds

The Contractor shall conduct field test welds on pieces of scrap liner prior to production welding at the following frequency. The CQA Monitor shall observe that the Contractor conducts test welds in accordance with the Specifications.

The CQA Monitor shall record the shear and peel test results for the test weld coupons on a geomembrane start-up trial weld log form. The Contractor shall not begin welding of field seams unless the CQA Monitor has verified that the trial welds are acceptable. Once a welding technician has been approved on a specific welding apparatus, he may not change machines without first passing a test weld on the new equipment.

5.6 Seaming of Geomembrane

The CQA Monitor shall observe that the geomembrane is seamed between the minimum and maximum ambient temperatures described within the Specifications. The CQA Monitor shall measure and record the temperature in accordance with the Specifications.

The CQA Monitor shall observe that the geomembrane is not being deployed during precipitation, in the presence of excessive moisture, in areas of ponded water, or in the presence of excessive winds.

The Contractor's QC Technician and the CQA Monitor shall observe that geomembrane seams are oriented parallel to the maximum slope direction and that a seam numbering system…