0601_AveryCounty_MSWLF_May21LFG_FID1588424_20210709

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SMITH- GARDNER
ENGINEERS
July 8, 2021
Ms. Jaclynne Drummond
NCDENR DWM Solid Waste Section
2090 U.S. 70 Highway
Swannanoa, North Carolina 28778-8211
ABBRESS TEL WEB
14 N. Boylan Avenue, Raleigh NC 27603 919.828.0577 www.smithgardnerinc.com
RE: Operations, Monitoring, and Maintenance Report — May 2021
Avery County Closed MSW Landfill (Permit No. 06-01)
Spruce Pine, North Carolina
Dear Ms. Drummond:
On behalf of Avery County (County), Smith Gardner, Inc. (S+G) is pleased to present this report
regarding the operation and maintenance (0&M) of the Avery County Closed MSW Landfill
(Permit No. 06-01) Landfill Gas Collection and Control System (LFGCCS), and the perimeter
monitoring probes for May 2021. Site details are provided below.
SITE HISTORY
The Avery County Closed MSW landfill is located approximately 0.6 miles southeast of the
intersection of Highway 19 and Brushy Creek Mountain Road next to the Avery County Airport
and the Unimin Corporation sand mine facility. There is no active mining in the immediate
vicinity of the landfill.
The MSW landfill was operated from 1970 until it closed in 1993. The property consists of
approximately 14.4 acres, with the landfill footprint occupying approximately 9.6 acres of the
site. Landfill topography ranges in elevation from approximately 2770 ft. msl to 2670 ft. msl,
and slopes downhill toward Brushy Creek.
Landfill gas monitoring and LFGCCS maintenance is completed on a monthly basis due to
landfill gas concentrations detected in monitoring probes off -site.
LFG COLLECTION AND CONTROL SYSTEM MONITORING ACTIVITIES
The site has an active Landfill Gas Collection and Control System (LFGCCS) consisting of 10
landfill gas extraction wells (W-1 through W-10), HDPE piping for transmission of collected
landfill gas, a one (1) horsepower blower, a condensate trap and storage tank, a candlestick
flare, and associated valves and gauges.
Well field and flare station data are provided in the attached Table 1.

DocuSign Envelope ID: B3CEC20D-2778-41E8-907E-A5EFED02FOA4
Ms. Drummond
July 8, 2021
Page 2of4
LFG Extraction Well Field
• W-1 through W-10: S+G performed methane (CH4), oxygen (02), and carbon dioxide
(CO2) monitoring as well as flow and pressure monitoring. In general, gas quality
has a wide variance across the wellfield. W-6, W-8, and W-10 had recorded oxygen
levels above 5% this sampling event. These three extraction wells were tuned to
limit oxygen intrusion, and will continue to be tuned to limit the concentration of
oxygen in the landfill gas.
Flare Station
Gas quality measured at the flare is nominal with low levels recorded of methane, and
higher levels recorded of oxygen. The higher oxygen levels may be a result of higher
oxygen levels measured in the wellfield, and will be investigated further. The wellfield
will continue to be monitored, tuned, and maintained as necessary to identify potential
issues with the system and to improve gas quality levels.
LFG MONITORING WILL (PERIMETER) MONITORING PROGRAM
S+G performed monitoring of the perimeter LFG monitoring network during this event. The
network consists of probes P-1 through P-13 located around the facility, and in some cases,
on adjacent properties. Monitoring results for this month indicate the following probes have
landfill gas concentrations above the LEL:
• P-3
• P-7
It should be noted that P-3 is located on the landfill property, immediately adjacent to waste
on the northern boundary of the site. The concentration in P-3 is significantly lower than the
peak observed in fall of 2019. Monitoring probe P-7, also located on the landfill property
adjacent to waste, had a methane concentration of 14.3% this month. This is above the LEL,
but is lower than the past two monitoring events. Both P-3 and P-7 have been connected to the
LFG collection system with an applied vacuum to reduce the migration of LFG. Off -site
monitoring probes, P-11 and P-12, further from waste near probes P-3 and P-7 do not indicate
detectable concentrations of methane.
The remaining perimeter monitoring probes were observed to have no detectable methane
concentrations. Attachment 1 includes the monitoring forms with results while Attachment
2 provides a CH4 concentration graph overtime for monitoring wells that have historically had
methane present. Monitoring of the current well network will continue, and data will be
reported to NCDEQ and the County.

DocuSign Envelope ID: B3CEC20D-2778-41E8-907E-A5EFED02FOA4
Ms. Drummond
July 8, 2021
Page 3of4
CONCLUSIONS
In general, the landfill gas extraction system continues to operate nominally. Elevated levels
of oxygen were measured in three landfill gas extraction wells during this sampling event. S+G
will continue to monitor the methane concentrations at the site monthly, and advise the County
as needed on repairs required to maintain an effective collection system.
The next monitoring event is scheduled for June 2021. 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 GARDNER, INC.
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Joan A. Smyth, P.G.
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Ms. Drummond
July 8, 2021
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FIGURES

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T� ' 1 • . 0 EXISTING LANDFILL GAS PROBE
• +• ® OFFSITE STRUCTURE TO BE
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,,. •�;�` REFERENCES
«� 1. ADJACENT PROPERTIES ARE FROM AVERY COUNTY GIS MAPPING
DEPARTMENT.
_• r 2. MONITORING WELL LOCATIONS FROM FIELD SURVEY DATED 1/14/08, BY
SURVEYING SOLUTIONS, P.C.
3. PROPERTY LINE FROM FIELD SURVEY DATED APRIL 9, 2010, BY
.1�►.,f■1 APPALACHIAN PROFESSIONAL LAND SURVEYORS & CONSULTANTS.
• 4. LFG PROBES LOCATIONS FROM FIELD SURVEY DATED APRIL 9, 2010, BY
Opp A APPALACHIAN PROFESSIONAL LAND SURVEYORS & CONSULTANTS.
�, • • PROBE P-2, P-3, AND P-9 THROUGH P-13 LOCATIONS WERE NOT
•; SURVEYED AND ARE APPROXIMATE.
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TABLES

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SMITH GARDNER
TABLE 1
Avery County Closed MSW Landfill
Landfill Gas Collection and Control System Monitoring
May 2021
DATE: June 9, 2021
BY: MJL
Device10
Date/Time
CH4
CO2
02
Balance
Init. Temperature
Init. Static
Pressure
Adj. Static
Pressure
Init. Diff.
Pressure*
Init. Flow
Adj. Flow
System
Pressure
mm/dd/yyyy
%
%
%
%
deg F
in H2O
in H2O
in H2O
Scfm
Scfm
in H2O
AVERY-WI
5/26/2021
72
26.5
0.1
1.4
67.1
-40.82
-40.87
0.032
0.6
0.5
-40.15
AVERY-W2
5/26/2021
61.5
24.2
0
14.3
67.4
-40.26
-40.42
0.175
1.4
1.3
-40.18
AVERY-W3
5/26/2021
71.1
26.7
0.1
2.1
67.4
-40.49
-40.57
0.164
1.4
1.3
-39.84
AVERY-W4
5/26/2021
18.3
16.1
0.6
65
68.1
-40.63
-40.68
0.02
4.5
4.4
-40.05
AVERY-W5
5/26/2021
32.7
24.7
0.8
41.8
67.4
-31.25
-31.25
0.454
2.1
2.1
-31.16
AVERY-W6
5/26/2021
5.8
13.3
6.5
74.4
68.6
-40.84
-40.84
0.042
11.7
11.8
-40.14
AVERY-W7
5/26/2021
18.2
17.7
0.1
64
68.2
-7.65
-7.65
0.076
0.1
0.1
-7.6
AVERY-W8
5/26/2021
7.6
11.8
7
73.6
68.7
-40.78
-39.8
0.025
9.1
9.5
-37.69
AVERY-W9
5/26/2021
18.5
21.4
1.5
58.6
67.2
-40.91
-40.95
0.016
3.5
3.4
-40.74
AVERY-W10
5/26/2021
41.1
20.2
6.8
31.9
67.5
-40.74
-40.92
0.016
3.7
4
-40.79
Av-Flare
5/26/2021
19.6
13.9
6.5
60
69.5
0.97
0.99
0.981
22.6
23.9
1.02
*The differential pressure measurement should be positive. A negative differential pressure may indicate no gas flow. Negative
differential pressure can be the result of dirt or water obstructing the pitot tube perforations. Overpulling by adjacent extraction wells may
also result in negative pressure being displayed.
NR= not recorded

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ATTACH MENT 1
PERIMETER MONITORING PROBE DATA

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NC Division of Waste Management - Solid Waste Section
Landfill Gas Monitoring Data Form
Notice: This form and any information attached to it are 'Public Records" as defined in NC General Statute 132-1. As such, these documents are available for inspection and
examination by any person upon request (NC General Statute 132-6).
FacilityName: Arj g9Lkf-&P[Q,4eLdlM§ L990filLandf ill Permit Number: 06 Al-o l
Date of Sampling: 5/26/2021 NC Landfill Rule (.0500 or .1600): .050@500
Name and Position of Sample Collector: Michael J. Liebl - Environmental Technician
Type and Serial Number of Gas Meter: GEM50001 G506472
Date and Time of Field Calibration: 5/26/2021, 1008
Calibration Date of Gas Meter: 12/2020
Type of Field Calibration Gas (15115 or 35/50): 35/15 Expiration Date of Field Calibration Gas Canister: N/A
Pump Rate of Gas Meter: 0.5 LPM
Ambient Air Temperature: 83 F Barometric Pressure: 27.38 in Hg General Weather Conditions: Sunny
Instructions: Under "Location or LFG Well" identify the monitoring wells or describe the location for other tests (e.g., inside buildings). A drawing showing the location of test
must be attached. Report methane readings in both % LEL and % methane by volume. A reading in percent methane by volume can be converted to % LEL as follows: % methane
by volume = % LEL/20
Location or
LFG Well ID
Sample Tube
Purge
Time
Time
P--ped (s)
InitW
o/iiLEL
Stabilized
%LF-L
11/XH4
by
Volume
%0-2
%CO2
Notes
H 2S p p m
P-1
>60s
1213
>60s
0
0
0.0
19.3
1.3
0
P-2
>60s
1216
>60s
0
0
0.1
19.8
0.8
0
P-3
>60s
1220
>60s
156
156
9.5
12.2
6.0
0
P-4
>60s
1225
>60s
0
0
0.0
20.5
0.4
0
P-5
>60s
1159
>60s
0
0
0.0
20.1
1.1
0
P-6
>60s
1148
>60s
0
0
0.0
18.4
0.6
0
P-7
>60s
1129
>60s
366
366
14.3
0.8
13.5
6
P-8
>60s
1138
>60s
0
0
0.0
19.6
3.3
0
P-9
>60s
1237
>60s
0
0
0.0
20.2
0.2
0
P-10
>60s
1240
>60s
0
0
0.0
19.4
0.5
1
P-11
>60s
1231
>60s
0
0
0.0
18.1
1.4
2
P-12
>60s
1134
>60s
0
0
0.0
19.7
0.1
0
P-13
>60s
1251
>60s
0
0
0.0
14.6
5.6
0
Airport Structures
>60s
1253
>60s
0
0
0.0
21.0
0.1
0
If your facility has more gas monitoring locations than there is room on this form, please attach additional sheets listing the same
information as contained on this form.
Certification To the best of my knowledge, the information reported and statements made on this data submittal and attachments are true and correct. I am aware that
there are significant penalties for making any false statement, representation, or certification including the possibility of a fine and imprisonment.
DocuSigned by:
Hze" tuu
SIGNATURE
Staff Environmental Technician
TITLE

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ATTACHMENT 2
HISTORICAL PERIMETER MONITORING PROBE TRENDS

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DocuSign Envelope ID: B3CEC20D-2778-41E8-907E-A5EFED02FOA4
SMITH GARDNER
% CH4 by
Volume
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
By: MJL
Date: 6/9/2021
Avery County MSW Landfill
Landfill Gas Monitoring Well Network
Methane Concentrations Between January 2014 and May 2021
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