6301_Moore_MSWLF_LFGRemediationPlanResponse_DIN28748_20180213

February 13, 2018

Sent Via Email - [e-mail]
Mr. Chad Beane
Moore County Solid Waste
P.O. Box 1927
Carthage, North Carolina 28327

Re: Landfill Gas Remediation Plan
Closed and Unlined Moore County MSW Landfill
Moore County
Solid Waste Permit Number 6301-MSWLF-1979
DIN 28748

Dear Mr. Beane:

The Section has completed a review of the Landfill Gas Remediation Plan dated January 31, 2018 (DIN
28747) that was submitted on your behalf by Golder Associates NC, Inc. for the closed and unlined Moore
County MSW Landfill, Permit Number 6301-MSWLF-1979. The Plan was submitted in response to
continued methane gas and groundwater exceedances and in response to the Section’s September 28,
2017 letter to the County (DIN 28498).

As discussed in the County’s submittal titled Groundwater Corrective Action Milestone Schedule dated
January 31, 2018 (DIN 28745 and 28746), a methane cut off trench and a replacement of groundwater
monitoring well MW-15 with MW-15R will be installed. In addition, MW-15 was approved to be converted
to a compliance methane monitoring well and a turbine vent will be installed to help prevent migration
of methane toward the property boundary as approved within the Assessment Monitoring Plan for the
active C&D landfill (DINs 28724 and 28725).

The methane cut off trench will be approximately 200 feet long, 2 to 4 feet wide, and 20-25 feet deep (to
the depth of the water table) and will be located near MW-15. The cut off trench will be installed by
September 15, 2018.

If the trench is successful in the area of MW-15, a separate trench will be evaluated for installation in the
area of MW-6. However, if the trench is unsuccessful in eliminating the methane exceedances at MW-15
after six months after the installation, a more active remedy will be evaluated. The County will continue
to maintain the cap as part of the post-closure care activities and will continue to attempt to acquire
buffer property to the north.

Based upon a review of the Landfill Gas Remediation Plan, the remediation activities are approved as
described. If you have any questions or concerns regarding this letter, please feel free to contact me by

email at [e-mail] or by phone at 828.296.4706. Thank you for your cooperation
with this matter.

Sincerely,
Jaclynne Drummond
Hydrogeologist
Solid Waste Section, Division of Waste Management
NCDEQ

cc sent via email: Ed Mussler, Section Chief
Jason Watkins, Field Operations Branch Head
Adam Ulishney, Environmental Compliance Branch Head
Drew Hammonds, Eastern District Supervisor
Amanda Freeman, Senior Environmental Specialist
Donna Wilson, Permitting Branch Engineer
Wayne Vest, Moore County Manager
Randy Gould, Moore County Public Works Director
Ben Draper, Golder Associates NC, Inc.
Rachel Kirkman, Golder Associates NC, Inc.