2022-08-11_M1,_P4_and_5_Final_Closure_CQA_Plan.pdf

Construction Quality Assurance Plan Module 1, Phase 4 and 5 Final Cover Kiefer Landfill

Prepared for:

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

August 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 and Stockpiling

4.5 Engineered Fill Placement

4.6 Existing Intermediate Cover Ripping, Moisture Conditioning, and Compaction

4.7 Evapotranspirative (ET) Cover Placement

4.8 Seeding

4.9 Rock Slope Protection and Stormwater Channels

4.10 Surveys and As-Builts

5. Geosynthetics Construction Quality Assurance

5.1 Erosion Control Mat Quality Assurance

5.1.1 Pre-Construction Submittal Review

5.1.2 Delivery

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5.1.3 Subsurface Preparation

5.1.4 Placement

5.1.5 Repairs

5.2 Geotextile Quality Assurance

5.2.1 Pre-Construction Submittal Review

5.2.2 Delivery

5.2.3 Subsurface Preparation

5.2.4 Placement and Seaming

5.2.5 Repairs

6. HDPE Pipe Quality Assurance

6.1 General

6.2 Delivery

6.3 Installation

7. CMP Pipe Quality Assurance

7.1 General

7.2 Delivery

7.3 Installation

7.4 Drop Inlet and Trash Rack Structures Installation

8. Work Deficiencies

9. Documentation

9.1 Daily Records

9.2 Observation and Test Data Sheets

9.3 Weekly Progress Reports

9.4 Design Change Reports

9.5 Construction Difficulty Reports

9.6 Final Report

9.7 As-Built Drawings

List of Tables

4.1 Earthwork Conformance and Construction 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, 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 Section 8.

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 final cover 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.

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Construction Quality Assurance Consultant (CQA Consultant) - The party, independent from County or Contractor, that is responsible for observing and documenting activities related to the quality of material manufacturing, material installation, and other construction activities related to the project. Also responsible for issuing a CQA report sealed by a Professional Engineer registered in the State of California.

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

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 – 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 Section 8.1 of this CQA Plan.

Design Engineer - The individual(s) or firm(s) responsible for designing the final cover and preparing the Construction Drawings and 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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Geotextile - Woven or nonwoven sheet synthetic fabric manufactured for use as a cushion, separator, or reinforcement in geotechnical applications.

Installer – The Installer is responsible for proper installation of the geosynthetic components in accordance with the Construction Drawings and Specifications. The Installer may be affiliated with the Manufacturer.

Manufacturer - The Manufacturer(s) is responsible for production of the geosynthetic, pipe, or other material 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 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 final cover, including (but not limited to) Contractor submittals, Construction Drawings, Specifications, 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 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.

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Specifications - The official quality requirements for products, materials, and workmanship upon which the design and construction of the project are based.

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 1, Phase 4 and 5 Final Cover project at the Kiefer Landfill owned and operated by County of Sacramento, Department of Waste Management and Recycling (DWMR). CQA refers to the duties of a third party CQA Consultant hired by the DWMR 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 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 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 DWMR and approved by the RWQCB. The CQA Monitor shall observe all field installation activities. 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 final cover system and associated components 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

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CQA personnel shall make every effort to communicate in an efficient and effective manner to the Contractor’s representatives on issues concerning testing and observation procedures and results of materials or in-situ tests performed.

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 DWMR 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 DWMR may also be referred to as County.

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 DWMR 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 landfill gas system modifications. 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 DWMR 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, and landfill gas system modifications, 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 ET cover 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 DWMR, 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 DWMR’s request, prior to project start-up. The parties that shall attend this meeting are the DWMR, 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 DWMR’s Representative shall document the preconstruction meeting and copies shall be provided to all attendees and other parties requested by the DWMR. Preconstruction meeting documentation shall become part of the project documents.

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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:

⦁ 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, DWMR 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 DWMR, 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.

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

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 DWMR, 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 thickness of ET cover, decreasing the number of stormwater structures, changing the ET cover specifications, 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 final cover components and the extent of final cover installation. The following procedures will be implemented for all major changes:

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

⦁ DWMR 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).

⦁ Copies of approved changes will be distributed to DWMR, 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 final cover system. The Contractor shall excavate soils from the borrow area and place in designated stockpiles, as engineered fill, and as ET cover to achieve the grades set forth within the Drawings and Specifications. Earthwork includes but is not limited to:

⦁ Excavation and stockpiling

⦁ Engineered fill placement

⦁ Existing intermediate cover soil ripping, moisture conditioning, and grading

⦁ Evapotranspirative (ET) cover placement

⦁ Seeding

⦁ Installation of stormwater controls, including rock slope protection, drainage channels

⦁ Aggregate base placement

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 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.

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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 testing, and samples obtained during construction such as samples obtained for moisture-density relationship testing.

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

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⦁ Soil material type

⦁ Project name and project number

⦁ Name of CQA Monitor that obtained the sample

⦁ 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 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 Soil Classification D2488/D2487 1/ 10,000 cy placed Sieve Analysis D6913 1/ 10,000 cy placed Moisture / Density Relationship D1557 1/ 10,000 cy placed Engineered Fill Construction Testing Soil Classification D2488/D2487 1/ 10,000 cy placed Sieve Analysis D6913 1/ 10,000 cy placed Density, Nuclear Method D6938 1/ 2,500 cy placed Moisture Content, Nuclear Method D6938 1/ 2,500 cy placed In Place Density Verification (Sand Cone Method) D1556 1/ 20 nuclear tests Oven Moisture Content Verification D2216 1/ 20 nuclear tests ET Cover Soil Conformance Testing Moisture / Density Relationship D698 1/ 5,000 cy placed Soil Classification D2488/D2487 1/ 5,000 cy placed

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Required Tests

ASTM

Designation Test Frequency Sieve Analysis D6913 1/ 5,000 cy placed Atterberg Limits D4318 1/ 5,000 cy placed ET Cover Soil Construction Testing Density, Nuclear Method D6938 1/ 250 cy placed Moisture Content, Nuclear Method D6938 1/ 250 cy placed In Place Density Verification (Sand Cone Method) D1556 1/ 20 nuclear tests Oven Moisture Content Verification D2216 1/ 20 nuclear tests Soil Classification (Visual Method) D2488 Continuous 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 Sand Equivalent CA Test 217 1/ material type Durability Index CA Test 229 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 Pipe Bedding and Pipe Zone Backfill Conformance Testing

Gradation C136/D6913 1/ material type Identification and Classification of Soil Type D2487/D2488 1/ material type Pipe Bedding and Pipe Zone Backfill Construction Testing

Identification and Classification of Soil Type D2487, D2488 1/ 100 cy placed

4.4 Excavation and Stockpiling

The excavated soil materials shall be segregated by material type and stockpiled in the identified stockpiles, placed as engineered fill, or placed as ET Cover as directed by the CQA Monitor or DWMR Representative. Prior to and during excavation and stockpiling operations, 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 Specifications.

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⦁ Visually monitor the excavation to identify soil types and confirm the soil types by sampling and visual classification. Notify the Contractor of visual classification and identify the associated stockpile (sand, suitable, unsuitable, closure area, etc.) that should receive the excavated soil.

⦁ Observe that the stockpiles conform to the requirements of the Specifications.

⦁ Observe that excavated waste is hauled to the working face of the landfill or as directed by the County.

4.5 Engineered Fill Placement

Engineered fill includes the construction of all final cover berms, drainage structures, roads, and other items designated on the Drawings or Specifications as engineered fill within the construction area. Prior to and during engineered 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 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.

⦁ 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.

⦁ 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 frequencies are provided in Table 4-1.

⦁ Verify that the engineered fills are placed to the lines and grades shown on the Drawings.

⦁ Summarize nuclear moisture density test data on a summary form and verify that CQA data is reviewed, summarized, and filed as indicated in this CQA Plan.

4.6 Existing Intermediate Cover Ripping, Moisture

Conditioning, and Compaction

Prior to and during the existing intermediate cover ripping, moisture conditioning, and compaction the CQA Monitor shall:

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⦁ Verify that clearing and stripping is performed, where applicable, in accordance with the Specifications, and that all cleared and stripped materials are properly stockpiled at a location designated by the Engineer or DWMR.

⦁ Verify that the existing intermediate cover (to be included in the overall thickness of the ET cover) is graded, ripped, moisture conditioned, and graded as shown in the Drawings and in accordance with the Specifications. Test the existing intermediate cover soils to verify conformance with the requirements for ET cover materials shown in Table 4-1 and the Specifications.

⦁ Verify that the surface is track-walked in accordance with the Specifications prior to placement of ET cover soil.

4.7 Evapotranspirative (ET) Cover Placement

Prior to and during ET cover soil placement, the CQA Monitor shall:

⦁ Verify that clearing and stripping is performed, where applicable, in accordance with the Specifications, and that all cleared and stripped materials are properly stockpiled at a location designated by the Engineer/DWMR. Specific attention will be made to assure that no weeds or seeds will contaminate the ET cover material from the borrow source.

⦁ Verify that construction staking is performed prior to work.

⦁ Verify that slope requirements and grading tolerances are met.

⦁ Verify that the existing intermediate cover is prepared in accordance with the Specifications.

⦁ Verify that well extensions are completed prior to placement of ET cover soils.

⦁ Verify that ET cover soil excavations are from the pre-approved suitable soil borrow area excavations or stockpile, as described in the Specifications and Drawings.

⦁ Verify that ET cover soils meet the classification properties identified in the Specifications.

Test the ET cover soils to verify conformance with the requirements shown in Table 4-1 and the Specifications.

⦁ Visually inspect the ET cover soil minimizes the inclusion of oversize particles within loosely placed lifts in thickness specified in the Specifications.

⦁ Verify that equipment spreading material has a ground pressure equal to or less than the specified ground pressure.

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⦁ Test compaction and moisture content at required frequencies and record data on field density test form.

⦁ Summarize nuclear moisture density test data on summary form.

⦁ Verify that CQA data is reviewed, summarized, and filed as indicated in this CQA Plan.

⦁ Verify the actual thickness of the ET cover after compaction by direct measurements. The thickness of the soil layer shall not be less than the thickness required by the Drawings and Specifications. Thickness measurements shall be taken by the Contractor and observed by the CQA Monitor as required by Specifications. The ET cover final grades shall be verified by the Contractor as required in the Specifications.

⦁ Verify that care is taken in the vicinity of LFG wells and other protrusions to prevent physical damage by the construction equipment.

⦁ Verify that dust control is maintained throughout the excavation, hauling, and placement operations.

4.8 Seeding

During seeding of the ET cover area, stockpiles, and soil borrow area, the CQA Monitor shall:

⦁ Verify that the proposed seed mixture and application rates meet the requirements identified in the Specifications.

⦁ Observe the quantity and the uniformity of soil amendments incorporated within the tilled depth before seeding.

⦁ Verify that the seeding application equipment is appropriate for the project. Verify the rate of seed and amendment application, amount and uniformity of coverage, and watering instructions (if any) are as provided in the Specifications.

⦁ Examine the perimeter areas to ensure that no unseeded areas remain.

⦁ Verify that a weed-free straw or mulch stabilizer is in place in accordance with the Specifications to protect the cover from erosion until the vegetation becomes established.

4.9 Rock Slope Protection and Stormwater Channels

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

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⦁ 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 5.2 of this Plan.

⦁ Verify that the rock slope protection (grouted or not grouted) materials are placed to the approximate lines and grades shown on the Drawings.

4.10 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. Confirm that the specified as-built survey grid is used to confirm minimum thicknesses and lines and grades of finished surfaces. Confirm that additional survey points are obtained at grade breaks. As-built surveys and submittals shall be in accordance with requirements of the Specifications.

5. Geosynthetics Construction Quality Assurance This section describes the geosynthetics construction quality assurance program for the Module 1, Phase 4 and 5 Final Cover described herein. The geosynthetic components consist of erosion control mat at the transitions of the ET cover soil with perimeter roads and in stormwater swales as well as woven geotextile underneath access road base rock and non-woven geotextile underneath stormwater drainage channels and rock slope protection. Objectives of the geosynthetics CQA program are to:

⦁ Assure geosynthetic materials manufactured for the project meet quality standards defined in the Specifications.

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⦁ Assure proper construction techniques and procedures are used during installation of geosynthetics.

⦁ Identify and define problems that may occur during construction and then verify that these problems are corrected before construction is complete.

To assure compliance, the CQA Officer shall review the Manufacturer’s quality control (MQC) testing; documentation of construction quality control (CQC) testing, and visual observation of the installations. Geosynthetics MQC must take place before geosynthetics installation to verify material quality. Construction testing includes activities that occur during geosynthetics installation to verify installation quality.

5.1 Erosion Control Mat Quality Assurance

5.1.1 Pre-Construction Submittal Review

At least 14 days prior to scheduled manufacturing of the product, the Manufacturer shall provide the CQA Organization the following items for review and testing:

⦁ Manufacturer’s description (cut sheet) of the proposed erosion control mat documenting it will meet or exceed specified requirements.

⦁ Written instructions for storage, handling, installation, and repair of the proposed erosion control mat.

Prior to shipment of the erosion control mat, the CQA Officer shall review the erosion control mat submittals for conformance to the Specifications.

5.1.2 Delivery

During or after delivery of erosion control mat, the CQA Monitor shall:

⦁ Verify equipment used to unload the rolls will not damage the erosion control mat.

⦁ Verify rolls are wrapped in impermeable and opaque protective covers.

⦁ Verify that care is used to unload the rolls.

⦁ Verify that all MQC and submittal documentation required by the Specifications has been received, reviewed and filed.

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⦁ Verify each roll is marked or tagged with Manufacturer’s name; project identification; lot number; roll number; roll dimensions and that this information is documented on an Inventory Log.

⦁ Verify materials are stored in a location protected from ultraviolet light exposure, precipitation, mud, dirt, dust, puncture, cutting, or any other damaging or deleterious conditions.

Damaged rolls may be rejected by the CQA Monitor depending on level of damage. If rejected, verify that rejected material is removed from the site or segregated from accepted rolls. Erosion control mat rolls that do not have proper Manufacturer’s documentation must also be stored at a separate location, until all documentation has been received and approved.

5.1.3 Subsurface Preparation

Before erosion control mat installation, the CQA Monitor shall:

⦁ Verify that the final ET cover placement is complete, its thickness has been verified, and all CQA testing is completed, reviewed and filed.

⦁ Verify that the final ET cover surface does not contain stones that could damage the erosion control mat.

⦁ Verify that all construction stakes or devices used to measure the final ET cover layer thickness have been removed from the installation area.

5.1.4 Placement

During erosion control mat placement operations, the CQA Monitor shall:

⦁ Observe the erosion control mat, as it is deployed and identify all defects and defect corrective actions (panel rejected, patch installed, etc.). Verify that corrective actions are performed in accordance with the Specifications, and record these corrective actions in a daily progress report.

⦁ Verify that equipment used to install erosion control mat does not cause damage to the erosion control mat during deployment.

⦁ Verify that crews working on the erosion control mat do not smoke, wear shoes that could damage the erosion control mat, or engage in activities that could damage the erosion control mat.

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⦁ Verify that the erosion control mat is securely anchored to prevent movement by the wind.

⦁ Verify that adjacent panels are overlapped and seamed in accordance with the Specifications.

⦁ Verify that the erosion control mat was not exposed to direct sunlight for more than the maximum number of days recommended by the Manufacturer.

⦁ Examine the erosion control mat after installation to ensure that no potentially harmful foreign objects, such as needles, are present.

5.1.5 Repairs

Where repairs are necessary, the CQA Monitor shall verify that the following methods are used:

⦁ Patching - used to repair large holes, tears, and small defective areas.

⦁ Removal - used to replace large defective areas where the preceding method is not appropriate.

5.2 Geotextile Quality Assurance

5.2.1 Pre-Construction Submittal Review

At least 14 days prior to scheduled shipment of the product, the Manufacturer shall provide the CQA Organization the following items for review and testing:

⦁ Manufacturer’s description (cut sheet) of the proposed geotextile documenting it will meet or exceed specified requirements.

⦁ Written instructions for storage, handling, installation, seaming, and repair of the proposed geotextile.

Certification that nonwoven geotextile is needle-free.

Prior to shipment of the geotextile, the CQA Officer shall review the geotextile submittals for conformance to the Specifications.

5.2.2 Delivery

During delivery of geotextiles, the CQA Monitor shall:

⦁ Verify equipment used to unload the rolls will not damage the geotextile.

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⦁ Verify rolls are wrapped in impermeable and opaque protective covers.

⦁ Verify that care is used to unload the rolls.

⦁ Verify that all MQC and submittal documentation required by the Specifications has been received, reviewed for conformance, and filed.

⦁ Verify each roll is marked or tagged with Manufacturer’s name; project identification; lot number; roll number; roll dimensions and that this information is documented on a Geotextile Inventory Log.

⦁ Verify materials are stored in a location protected from ultraviolet light exposure, precipitation, mud, dirt, dust, puncture, cutting, or any other damaging or deleterious conditions.

Damaged rolls may be partially or fully rejected by the CQA Monitor depending on level of damage. If rejected, verify that rejected material is removed from the site or segregated from accepted rolls. Geotextile rolls that do not have proper Manufacturer’s documentation must also be stored at a separate location, until all documentation has been received and approved.

5.2.3 Subsurface Preparation

Before woven and non-woven geotextile installation, the CQA Monitor shall:

⦁ Verify that the final ET cover layer placement is complete, its thickness has been verified, and all CQA testing is completed, reviewed and filed.

⦁ Verify that the final ET cover layer surface does not contain stones that could damage the geotextile.

⦁ Verify that all construction stakes or devices used to measure the final ET cover layer thickness have been removed.

5.2.4 Placement and Seaming

During woven and non-woven geotextile placement and seaming operations, the CQA Monitor shall:

⦁ Observe the geotextiles, as they are deployed and identify all defects and defect corrective actions (panel rejected, patch installed, etc.). Verify that corrective actions are performed in accordance with the Specifications, and record these corrective actions in a daily progress report.

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⦁ Verify that equipment used to install geotextile does not cause damage to the geotextile during deployment.

⦁ Verify that crews working on the geotextile do not smoke, wear shoes that could damage the geotextile, or engage in activities that could damage the geotextile.

⦁ Verify that the geotextile is securely anchored to prevent movement by the wind.

⦁ Verify that adjacent panels are overlapped and seamed in accordance with the Specifications.

⦁ Verify that the geotextile was not exposed to direct sunlight for more than the maximum number of days recommended by the Manufacturer.

⦁ Examine the geotextile after installation to ensure that no potentially harmful foreign objects, such as needles, are present.

5.2.5 Repairs

Where repairs are necessary the CQA Monitor shall verify that the following methods are used:

⦁ Patching - used to repair large holes, tears, and small defective areas.

⦁ Removal - used to replace large defective areas where the preceding method is not appropriate.

6. HDPE Pipe Quality Assurance

6.1 General

This section covers all non-corrugated HDPE pipe material supply and installation CQA, including CQA of all landfill gas system pipes. The Contractor shall provide a copy of the certificate of compliance for production of the piping manufactured for this project prior to delivery for review by the CQA Monitor and CQA Officer.

6.2 Delivery

The CQA monitor shall verify that:

⦁ Materials are delivered to the site only after the CQA Officer receives and approves the required submittals.

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⦁ The materials were packaged and shipped by appropriate means so that no damage was caused to the materials delivered to the site.

⦁ The off-loading is done in the presence of the CQA Monitor and any damage during off-loading is documented by the CQA Monitor and the Contractor.

⦁ Damaged materials are separated from undamaged materials until the CQA Monitor determines proper disposition of the material.

⦁ The CQA Monitor shall keep a log of all piping delivered to the site on an inventory log of piping received.

⦁ All pipes are stored and stacked on a prepared surface as per manufacturer’s recommendation and approved by the CQA Monitor and are protected from puncture, precipitation, dirt, grease, water, mechanical abrasions, or other damage.

⦁ The Contractor uses appropriate handling equipment to load, move or deploy the material to ensure that no damage is caused to the materials during handling of the piping.

⦁ No piping is installed in a manner that could damage the underlying ET Cover and that all observed damage is recorded and clearly marked for scheduled repair.

⦁ Pipes are correct sizes in accordance with the Drawings.

6.3 Installation

The CQA Monitor shall verify and observe that:

⦁ Any necessary trenches are excavated to the lines and grades shown in the Drawings, including pipe bedding, and are free of debris prior to pipe laying.

⦁ Piping is installed to the lines and grades shown on the Drawings.

⦁ Pipe jointing is in accordance consistent with the Manufacturer’s recommendations and Specifications.

⦁ Backfilling is installed per Specifications and testing is in accordance with Table 4-1.

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7. CMP Pipe Quality Assurance

7.1 General

This section covers all CMP material supply and installation CQA, including CQA of all stormwater conveyance pipes in accordance with the Drawings and Specifications. The Contractor shall provide a copy of the certificate of compliance for production of the piping manufactured for this project prior to delivery for review by the CQA Monitor and CQA Officer.

7.2 Delivery

The CQA Monitor shall keep a log of all piping delivered to the site on an inventory log of piping received. The CQA monitor shall verify that:

⦁ Materials are delivered to the site only after the CQA Officer receives and approves the required submittals.

⦁ The materials were packaged and shipped by appropriate means so that no damage was caused to the materials delivered to the site.

⦁ The off-loading is done in the presence of the CQA Monitor and any damage during off-loading is documented by the CQA Monitor and the Contractor.

⦁ Damaged materials are separated from undamaged materials until the CQA Monitor determines proper disposition of the material.

⦁ All pipes are stored and stacked on a prepared surface as per manufacturer’s recommendation and approved by the CQA Monitor and are protected from puncture, precipitation, dirt, grease, water, mechanical abrasions, or other damage.

⦁ The Contractor uses appropriate handling equipment to load, move or deploy the material to ensure that no damage is caused to the materials during handling of the piping.

⦁ No piping is installed in a manner that could damage the underlying ET Cover and that all observed damage is recorded and clearly marked for scheduled repair.

⦁ Pipes are correct sizes in accordance with the Drawings.

7.3 Installation

The CQA Monitor shall verify and observe…