8202_SampsonCoMSWLF_20170519_RevisedCQAPlan_Phase3_DIN27807

May 19, 2017

Mr. Ming-Tai Chao, P.E.
Environmental Engineer
NC DEQ – Division of Waste Management
217 West Jones Street
Raleigh, NC 27603

RE: CQA Manual Revision, Permit Area 82-02
Sampson County Disposal, LLC

Dear Mr. Chao:

On behalf of Sampson County Disposal, LLC (SCD), Smith Gardner, Inc. would like to request
an administrative change to SCD’s CQA Manual that was submitted as part of the Phase III
PTC dated November 20131. Tables 4.2 and 4.3 have been revised to exclude “Hydraulic
Conductivity – In-Situ” tests which not a requirement by NC DEQ and has not been performed
at SCD in prior cells. A revised CQA Manual has been attached with this letter and will be
used during all future construction events.

Please contact us at [phone] or by email below if you have any questions or require
any additional information.

Sincerely,
SMITH GARDNER, INC.

John R. Fearrington, E.I. W. Michael Brinchek, P.E.
Staff Engineer (ext. 125) Senior Project Manager (ext. 128)
[e-mail] [e-mail]

Attachment CQA Manual

cc: Donna Wilson, NC DEQ
David Pepper, Waste Industries USA, Inc.
Bryan Wuester, SCD
File
H:\Projects\Sampson County Disposal\Sampson-17-1 (Cell 10 Construction)\CQA Manual Edits\2017-5-19__SCD
CQA Manual Revisions.docx

1 Permit to Construct Application, Sampson County Disposal, LLC, MSW Landfill Phase 3 and C&D
Landfill Cells 2B & 3, Smith Gardiner, Inc., November 2013, Revised through January 2015.
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Construction Quality Assurance Manual

Sampson County Disposal, LLC
MSW and C&D Landfills
Roseboro, North Carolina

Prepared for:

Sampson County Disposal, LLC
Roseboro, North Carolina

November 2013
Revised: January 2015
Revised: May 2017

Prepared by:

© 2017 Smith Gardner, Inc.
This document is intended for the sole use of the client for which it was prepared and
for the purpose agreed upon by the client and Smith Gardner, Inc.
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This Construction Quality Assurance (CQA) Manual has been prepared to provide the Owner,
(Design) Engineer, and CQA Engineer the means to govern the construction quality and to satisfy
landfill certification requirements under current solid waste management regulations.

More specifically, this CQA Manual addresses the soils and geosynthetics components of the
liner system, the leachate management system, and the final cover system. The liner system,
as referenced herein, consists of a soil subgrade and a composite liner (consisting of a soil liner
and an overlying GCL (alternative liner system only) and HDPE geomembrane). The leachate
management system consists of a leachate collection system (LCS) and a leachate transmission
and storage system. The final cover system consists of a landfill gas (LFG) system, LLDPE
geomembrane, overlying granular and geosynthetic drainage material with collection piping,
and overlying vegetative soil layer.

The CQA Manual is divided into the following sections:

• Section 1.0 General
• Section 2.0 CQA Documentation
• Section 3.0 Earthwork CQA
• Section 4.0 Soil Liner CQA
• Section 5.0 Geomembrane CQA
• Section 6.0 Leachate Management System CQA
• Section 7.0 Geotextile CQA
• Section 8.0 Drainage Geocomposite CQA
• Section 9.0 Geosynthetic Clay Liner CQA
• Section 10.0 Final Cover System CQA

In the context of this Manual, Construction Quality Assurance is defined as a
planned and systematic program employed by the Owner to assure conformity of
the liner, leachate management, and final cover systems installation with the
project drawings and the project specifications. CQA is provided by the CQA
Engineer as a representative of the Owner and is independent from the
Contractor, and all manufacturers. The CQA program is designed to provide
adequate confidence that items or services meet contractual and regulatory
requirements and will perform satisfactorily in service.

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The CQA Engineer will allow installation of the LCS to proceed only after he has
been provided certification of the installed HDPE geomembrane.

The CQA Engineer will monitor and document the construction of all LCS
components for compliance with the project specifications. Monitoring the
construction work includes the following:

monitoring the minimum vertical buffer maintained between field
equipment and the geomembrane;

monitoring that the placement of the LCS components does not fold or
damage the geomembrane or other underlying layers;

witness and verify the installation of collection piping and gravel columns;
and

conduct record tests on the protective cover layer in accordance with
Table 6.1.

The CQA Engineer will monitor and document the construction of all leachate
transmission and storage system components for compliance with the project
specifications. Monitoring the construction work includes the following:

witness and verify the installation of transmission piping;

witness and verify the leak testing of transmission piping; and

witness and verify the leak testing of manholes and storage tanks (where
applicable).

The CQA Engineer will immediately determine the extent and nature of all defects and
deficiencies and report them to the Owner and Engineer. All defects and deficiencies
will be documented by the CQA Engineer. The Contractor shall correct defects and
deficiencies to the satisfaction of the CQA Engineer. The CQA Engineer will observe all
retests on repaired defects.
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