4116_Guilford_WI_GFL_HighPoint_CDLF_LFGRemediationPlan_FID1594893_20210726

DocuSign Envelope ID: 095A807F-F82D-4431-B9F0-44AE5C2DE9F4
SMITH GARDNER
July 26, 2021
Mr. Jaclynne Drummond Hydrogeologist
Compliance Hydrogeologist
NCDENR DWM Solid Waste Section
2090 US Highway 70
Swannanoa, North Carolina 28778
AMESS TEr WEB
14 N. Boylan Avenue, Raleigh NE 27003 919.828.0577 www.smithgardnerinc.com
RE: Landfill Gas Remediation Plan
WI High Point C&D Landfill (NC Solid Waste Permit No.41-16)
Jamestown, North Carolina
Dear Ms. Drummond:
On June 2, 2021 Golder Associates NC, Inc. (Golder) sent a Notice of Exceedancel to NCDEQ
in response to an exceedance of the methane lower explosive limit (LEL) at compliance
monitoring point LFG-2A during the second quarter monitoring event for WI High Point C&D
Landfill INC Solid Waste Permit No. 41-16).
On behalf of WI High Point Landfill, LLC and in accordance with 15A NCAC 13B .0544(d)(3)(C)
S+G submits the following remediation plan in response to the exceedance for your review
and approval.
Site Information
South of LFG-2A is a perimeter berm, which serves as a visual buffer for the site. Standing
water is frequently present south of the berm, between the berm and the Reclamation
Facility. Historical landfill gas (LFG) data and data from the recent soil vapor survey shows
that presence of gas is limited to the area south of LFG-2A, between the berm and
reclamation pad.
Additional Investigation
Following detection of the exceedance, Smith Gardner, Inc. (S+G) performed a limited soil
vapor survey around LFG-2A where the exceedances occurred and investigated potential
remedies. The location of the soil gas survey investigation and the results are shown on
Figure 1. This investigation indicates that landfill gas is detected in limited areas of this
portion of the site.
On July 23, 2021 an approximate 100-foot-long trench, 8- to 10-foot-deep was excavated at
the midpoint of the berm to inspect the berm and underlying soils. The location of the trench
is included on Figure 1. As a result of the investigation organic debris, including soils and
stumps, was encountered.
r Notice of Exceedance Letter from Darren Cox, Rachel P. Kirkman, P.G. (Golder) to Jaclynne Drummond
(NCDEQ), Dated June 2, 2021.

DocuSign Envelope ID: 095A807F-F82D-4431-B9F0-44AE5C2DE9F4
Ms. Drummond
July 26, 2021
Page 2
Remediation Plan
The presence of organic debris and frequent standing water in the area is believed to be a
primary source of the gas within LFG-2A. As a result, the proposed remediation plan
includes:
removal of the organic matter encountered during the trench excavation;
installation of a fabric -wrapped 2-foot-deep gravel column and perforated PVC
stand -pipe within the trench to vent any gas; and
grading of the area between perimeter berm and reclamation pad to promote
drainage.
As the proposed system is installed and evaluated post -construction, additional remedial
actions may be recommended as necessary.
Remediation Schedule
The anticipated schedule for this remediation plan for the facility is presented below:
• Within 30-days of approval of this plan (weather permitting) construction activities
will be completed;
A report summarizing the field activities for LFG passive vent installation will be
submitted to NCDEQ within 60 days of completion of all field work. This report will
include construction inspection reports and as -built figures detailing the work; and
• Monthly monitoring and reporting of compliance monitoring point LFG-2A to NCDEQ
upon completion of each monitoring event until two (2) consecutive monitoring events
show methane concentrations below the LEL.
Based upon long-term monitoring of the proposed system, additional phases of remedial
action may be proposed in the future as necessary.
Record Keeping Program
The facility shall maintain documents relating to LFG monitoring in an operating record
located at the office of the General Manager or his designee. These records will be
presented upon request to DWM for inspection.

DocuSign Envelope ID: 095A807F-F82D-4431-B9FO-44AE5C2DE9F4
Ms. Drummond
July 26, 2021
Page 3
If you have any questions, or require additional information, please contact us at your earliest
convenience at 919-828-0577 or by e-mail (address below).
Sincerely,
SMITH GARONER, INC.
DocuSigned by:
B9779EBA711F488.
Joan A. Smyth, P.G.
Senior Hydrogeologist
0oan(asmithgardnerinc.com
Attachments
CC: Seth Heath - GFL
Bryan Wuester - GFL
Travis Hitchcock - GFL
CARO
SEAL
u1Docuu�Siignedby:028426
358C21 E64007440...
W. Michael Brinchek, P.E''+,#`qF�*•`�4
Senior Project Manager "+8+5101�1*/26/2021
[e-mail]
Joseph Santangelo, P.G. - GFL
Rachel Kirkman, P.G. - Golder
Dusty Reed, P.G. - Golder
H:\Projects\WI High Point Landfill W&D)\WIHIGHPOINT 21-3 (LFG-2A Gas Remediation Plan)\WI High Point Road LFG
Remediation Plan - Draft.docx

DocuSign Envelope ID: 095A807F-F82D-4431-B9F0-44AE5C2DE9F4
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DocuSign Envelope ID: 095A807F-F82D-4431-B9FO-44AE5C2DE9F4
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DocuSign Envelope ID: 095A807F-F82D-4431-B9F0-44AE5C2DE9F4
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