8803_TransylvaniaCoMSWLF_LFGRemRpt_DIN27440_20170215

2211 W. Meadowview Road, Suite 101 Greensboro, NC 27407
tel: [phone] fax: [phone] www.JoyceEngineering.com February 15, 2017 Mr. Ervin Lane
Compliance Hydrogeologist
Division of Waste Management/Solid Waste Section 1646 Mail Service Center Raleigh, NC 27699-1646
RE: Landfill Gas Remediation Plan
Transylvania County, Calvert Landfill, Permit No. 88-03 JOYCE Project No. 336.1701.11, Task No. 03
Dear Ervin:
On behalf of Transylvania County, Joyce Engineering (JOYCE) is submitting this letter of
response for the Calvert Landfill, Permit No. 88-03. This letter has been prepared in response to the
Notice of Violation (NOV) issued by the North Carolina Department of Environmental Quality (DEQ) Solid Waste Section dated December 19, 2016. SITE BACKGROUND
The Calvert Landfill is a closed (1992), unlined municipal solid waste (MSW) landfill
maintained by Transylvania County. The landfill property is located near the town of Rosman, North Carolina. The area surrounding the landfill is primarily agricultural and contains open fields and woodlands. The site is located in the Inner Piedmont physiographic province within the Chauga Belt, just southeast of the Brevard Fault Zone. The unit within the Chauga Belt that underlies the site is
the Henderson Gneiss, which consists of augen gneisses. The mineralogy consists of microcline,
oligoclase, quartz, biotite, muscovite, epidote, and sphene. LANDFILL GAS MONITORING HISTORY
Gas monitoring at the Calvert Landfill has been performed throughout the post-closure care
period. Some gas monitoring probes have periodically exceeded the lower explosive limit of 5% since
April 2013 semiannual monitoring event. Table 1 summarizes the historical gas monitoring results from April 2013 to present. In April 2016 semiannual event probe GP-6 was measured concentration of methane at 16.6% (percent by volume), which is in exceedance of the lower explosive limit (LEL) for methane (5% by volume at standard temperature and pressure). GP-9 in April 2016 recorded 60.3
% and in October 60.2 % (percent per volume), which are in exceedance of the LEL for methane 5%.

Date Location CH4 (% LEL) CH4 (% Volume)
4/26/2016 GP-6 332 16.6
4/26/2016 GP-9 1206 60.3
10/17/2016 GP-9 1204 60.2

Mr. Ervin Lane February 15, 2017
Page 2 of 3

PROPOSED REMEDIAITON STRATEGY
In response to the December 19, 2016, NOV JOYCE conducted a site visit on January 10, 2017, to review the landfill gas monitoring probes for their conditions and locations. The locations were verified in respect to proximity to the limits of waste and the property line. Odd numbered gas probes GP-3, GP-9, and GP-11 are located on the buffer zone, and even numbered GP-4, GP-6, GP-8,
and GP-12 are the boundary probes located along the landfill perimeter road.
As a result of the site visit, Transylvania County had the Calvert landfill gas probes, groundwater monitoring wells, and gas vents surveyed. The revised site map is attached. In our review of the revised map and the landfill gas monitoring records summarized in Table 1, we found that two of the gas probes GP-8 and GP-9 had been recorded incorrectly. The records indicate GP-8
to be a buffer zone probe and GP-9 a boundary probe; instead, they are reported opposite. Corrected
exceedance data for 2016 monitoring is presented below.
Date Location CH4 (% LEL) CH4 (% Volume)
4/26/2016 GP-6 332 16.6
4/26/2016 GP-8 536 26.8
10/17/2016 GP-8 302 15.1
Transylvania County proposes to install two new landfill gas monitoring probes to replace the existing probes GP-6 and GP-8. The new probes are proposed to be installed on the east side of the
road in approximate vicinity of the existing probes. Existing GP-9 area is wet with decaying organics and suspect to false gas readings. MONITORING AND EVALUATION
Quarterly monitoring of the boundary gas probes will continue in accordance with the revised
site map and in accordance with the NCDEQ SWM Rules. Boundary probes GP-4, GP-6, GP-8, and GP-12 will be the boundary probes.
After one year of monitoring, the data will be evaluated to determine if gas is migrating off site. Following one year of landfill gas monitoring of probes GP-6 and GP-8, additional remedial
action will be considered if they remain in exceedance to the LEL.
SCHEDULE OF IMPLEMENTATION
• Quarterly gas monitoring will continue on the same schedule as before.
• The proposed gas probes will be installed within 60 calendar days of SWS approval of this LGRP.
• After the installation of the new probes, an evaluation of the data will be submitted to the SWS within 60 calendar days of the fourth quarterly monitoring event.
Mr. Ervin Lane February 15, 2017
Page 3 of 3

• A new Landfill Gas Remediation Plan will be submitted to the SWS proposing the next phases
of remediation within 60 calendar days of determining that methane is migrating off site in
the vicinity of GP-6 and GP-8.
Please feel free to contact Alex Everhart or me at [phone] if you have any questions regarding this Plan.

Sincerely, JOYCE ENGINEERING
Hannu Kemppinen, P.G. Senior Project Consultant Attachments: Table 1, Drawing 1
Copy: Jeff Brookshire – Transylvania County, Solid Waste Director
227
0
225
0
2230
2210 2200
22102220
22502240
22302220
2210
2200
2200
2210
2220
2230
2240
2250
2260
22
7
0
2280
228
0
2290
2300
2310
2320
2330
2230
2240
225
0
2
2
6
0
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7
0
22
8
0
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0
232
0
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MW-4
NM
MW-108
MW-107 S
MW-2
MW-3
SMP-1
MW-105 S
MW-1
MW-106 S
2188.97
WHW-1
APPROXIMATE PROPERTY LINE
APPROXIMATE
LIMITS OF WASTE
LEGEND
EDGE OF LINER
PAVED ROAD
EXISTING 2 FT CONTOUR
EXISTING 10 FT CONTOUR
GRAVEL ROAD
GROUNDWATER MONITORING WELL LOCATION,
IDENTIFICATION, AND GROUNDWATER ELEVATION
SURFACE WATER MONITORING LOCATIONS
AND IDENTIFICATIONS
1.MONITORING WELLS MW-4 AND MW-108 SURVEYED 1/24/17
2.ALL GAS PROBES AND GAS VENTS SURVEYED 1/24/17.
3. AERIAL SURVEY DATED APRIL 06, 2013, BY SPATIAL DATA, INC.
NOTES
GP-3
GP-4
GP-6 GP-9
GP-8
GP-11GP-12
GV-1
GV-2
GV-3
GV-5
GV-6
GV-4
GAS PROBE LOCATIONS AND IDENTIFICATIONS
GAS VENT LOCATION AND IDENTIFICATION GV-X
GP-X
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