6204_UwharrieMSWLF_approval_underdrainPlan_Cell14B_DIN27544_20170324

ROY COOPER
Governor
MICHAEL S. REGAN

Secretary

MICHAEL SCOTT
Director Solid Waste Section
Sent via Email

March 24, 2017

Mr. Mike Gurley, Republic Services of North Carolina, LLC (Republic Services)
Mr. Joe Reynolds, Uwharrie Regional Landfill
Mr. Matthew M. Woodard, County Manager, Montgomery County

Re: Approval of Underdrain Piping Plan
Modification to the Permit Approval to Construct [PTC] (DIN 23532)
Uwharrie Regional Landfill, Phase 4, Cell 14B
Montgomery County, North Carolina
Permit No. 6204-MSWLF-1995, Document ID No. (DIN) 27544

Gentlemen:

The Division Waste Management (DWM), Solid Waste Section (SWS) has reviewed the March
21, 2017 responses (DIN 27540) to the SWS comments on the Underdrain Piping Plan [Plan]
(DIN 27508) dated March 09, 2017. Hodges, Harbin, Newberry & Tribble, Inc. (HHNT), on
behalf of Republic Services, prepared and submitted the original plan and the responses. The
Plan proposes to install underdrain piping beneath the Uwharrie Regional Landfill (Landfill) -
Phase 4, Cell 14B. The purpose is to intercept seeps that are being encountered during grading
activities at Cell 14B and to gravity drain the flow to an existing drainage feature outside the
footprint of Cell 14B.

The SWS has no further comment on the Plan at this time and hereby approves the construction
of the underdrain piping underneath Landfill Cell 14B according to the approved Plans, DIN
27508 & 27540 including the Technical Specification Section 02220 – Trenching, Backfilling,
and Compaction. The construction quality testing results and as-built drawing(s) – piping
layout/alignment and profile prepared by a surveyor registered in the State of North Carolina
must be submitted as a portion of the Certified Construction Quality Assurance Report of the
Cell 14B according to the Permit Condition No. 19, Part II of Attachment 2 of the PTC dated
May 14, 2015 (DIN 23532).

According to the Plan (DIN 27540) Republic Services shall conduct and document monthly
monitoring of the seep flow to determine the long-term plan of the underdrain after pipe
installation is completed. The finding of the seep and the long-term plan of the underdrain piping
must be incorporated into the Landfill Phase 5 (Cells 15 & 16) Permit Approval to Construct
Application. Additionally, from July 2017 the current Water Quality Monitoring Program at the
Landfill shall include the seep sampling at the pipe outlet as part of the semi-annual groundwater
& surface water monitoring activities.

Mr. Mike Gurley, Republic Services of North Carolina, LLC (Republic Services)
Mr. Joe Reynolds, Uwharrie Regional Landfill
Mr. Matthew M. Woodard, County Manager, Montgomery County
March 24, 2017
DIN 27544
Page 2 of 2

Please place the approved plan and this letter in the landfill operating record. If you have any
questions of the permit, please contact my staff Ming Chao at 919-707-8251
[e-mail] or Cristine Ritter, at [phone] or [e-mail].

Sincerely,

Edward F. Mussler, III, P.E,
Permitting Branch Supervisor
Division of Waste Management, NCDEQ

cc:
K. Matthew Cheek, P.E., HHNT
Ming-Tai Chao, P.E, DWM
Christine Ritter, DWM
Teresa Bradford, DWM
Ervin Lane, DWM
Deb Aja, DWM
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