0601_AveryCounty_MSWLF_Oct21LFG_FID1628590_20211222

DocuSign Envelope ID: 6B9BCBF5-1B21-49D2-8F20-AF9E2F61EA51D
SMITH, GARDNER
ENGINEER
December 6, 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 — October 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 (O&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 October 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: 6B9BCBF5-1B21-49D2-8F20-AF9E2F61EA51D
Ms. Drummond
December 6, 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. All wells with the exception of W-5, W-6,
and W-10 had recorded oxygen levels below 5% this sampling event. The wells 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 WELL (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 9.4% 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 probe, P-11, which is located further from the waste near P-3 did not have
detectable concentrations of methane. Monitoring probe P-12 is located downstream of P-7,
and historically has not indicated the presence of methane; however, it was discovered this
month that the well casing was struck by a fallen tree and was unable to be monitored. In
addition to damage to P-12, probe P-7 was damaged with the lid ripped off. S+G will make
needed repairs to these probes during the November monitoring event.
The remaining perimeter monitoring probes generally do not have detectable concentrations
of methane. Attachment 1 includes the monitoring forms with results while Attachment 2
provides a CH4 concentration graph over time 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: 6B9BCBF5-1B21-49D2-8F20-AF9E2F61EA51D
Ms. Drummond
December 6, 2021
Page 3of4
CONCLUSIONS
In general, the landfill gas extraction system continues to operate nominally. W-5, W-6, and
W-10 will continue to be tuned to limit oxygen into the system. 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 November 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.
Senior Hydrogeologist ext.
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H:\Projects\Avery County (NCI\02 AC Compliance\LFG Monitoring\MSW\2021\10 October 2021\October 2021 Avery MSW LFG Monitoring Report.docx
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DocuSign Envelope ID: 6B9BCBF5-1B21-49D2-8F20-AF9E2F61EA51D
Ms. Drummond
December 6, 2021
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FIGURES

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' •^ ■ MONITORED
,,. •�;�` REFERENCES
«� -A 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�►.,N APPALACHIAN PROFESSIONAL LAND SURVEYORS & CONSULTANTS.
• 4. LFG PROBES LOCATIONS FROM FIELD SURVEY DATED APRIL 9, 2010, BY
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
October2021
DATE: October 6, 2021
BY: SCR
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-W1
10/5/2021
72.2
27
0
0.8
64.5
-36.45
-36.5
0.375
2.1
1.2
-36.29
AVERY-W2
10/5/2021
78.7
19.2
0.1
2
64.9
-4.29
-4.3
-0.004
0
0
-4.07
AVERY-W3
10/5/2021
71.5
27.2
0
1.3
64.4
-36.17
-36.21
0.208
1.5
1.8
-36.02
AVERY-W4
10/5/2021
58.1
15
4.9
22
65.6
-8.09
-8.15
0.023
5.5
5.2
-7.43
AVERY-W5
10/5/2021
30
19.6
6.2
44.2
65.4
-25.96
-25.95
0.538
2.3
2.3
-25.92
AVERY-W6
10/5/2021
8.5
15
6.8
69.7
72.4
-36.23
-36.31
0.205
26.6
25.7
-36.41
AVERY-W7
10/5/2021
68.7
31.2
0
0.1
66.1
-0.31
-0.31
-0.023
0
0
-0.23
AVERY-W8
10/5/2021
5.7
16.5
4.6
73.2
67.2
-4.03
-4.09
0.027
9.8
9.4
-3.98
AVERY-W9
10/5/2021
23.3
23.6
0.1
53
66.9
-36.64
-36.65
0.042
6
5
-36.45
AVERY-W10
10/5/2021
43.2
22.6
6.7
27.5
67.6
-33.74
-34.73
0.02
4.3
4
Av-Flare
10/5/2021
15.1
12
10.4
62.5
66.1
2.18
2.21
1.224
25.2
25.6
2.22
*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-01
Date of Sampling: 10/5/2021 NC Landfill Rule (.0500 or .1600): .050@500
Name and Position of Samnle Collector- Michael J. Liebl, Staff Environmental Technician
Type and Serial Number of Gas Meter: GEM5000, G506472
Date and Time of Field Calibration: 10/5/2021, 1225
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: 63 F Barometric Pressure: 27.38 in Hg General Weather Conditions: Overcast/Rain
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
fi--raped (s)
InitW
o/iiLEL
Stabilized
01nLEL
11/XH4
by
Volume
%0_2
°/OCG2
Notes
H 2S p p m
P-1
>60s
1357
>60s
0
0
0.0
16.3
4.7
0
P-2
>60s
1401
>60s
0
0
0.0
19.4
1.8
3
P-3
>60s
1406
>60s
136
136
6.8
13.8
2.4
0
P-4
>60s
1412
>60s
0
0
0.0
17.9
0.6
0
P-5
>60s
1346
>60s
0
0
0.0
19.2
0.3
0
P-6
>60s
1338
>60s
0
0
0.0
15.1
7.9
0
P-7
>60s
1332
>60s
188
188
9.4
9.3
17.2
1
P-8
>60s
1326
>60s
2
2
0.0
18.8
2.0
0
P-9
>60s
1423
>60s
0
0
0.0
19.5
0.1
0
P-10
>60s
1426
>60s
0
0
0.0
17.4
1.7
0
P-11
>60s
1417
>60s
0
0
0.0
12.6
8.5
1
P-12
-
-
-
-
-
-
- Well Casing Damaged, Fallen Tree
P-13
>60s
1435
>60s
0
0
0.0
19.3
2.3
0
Airport Structures
>60s
1437
>60s
0
0
0.0
20.0
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:
Mil LUU
SIGNATURE
Staff Environmental Technician
TITLE

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ATTACHMENT 2
HISTORICAL PERIMETER MONITORING PROBE TRENDS

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SMITH GARDNER
% CH4 by
Volume
80.0
70.0 '
60.0
50.0
40.0
Installation of W9/P3
Connection Installation of P7/W8 and
(September 11, 2014 P1/W10Connection
(September 3, 2015)
Avery County MSW Landfill
Landfill Gas Monitoring Well Network
Methane Concentrations Between January 2014 and October 2021
By: MJL
Date: 10/11/2021
30.0
20.0 '
10.01
0.0 - -It r°Ln �; l!1 lr0°l0 ir l0 �l0 l,0 lO0 l0 l0 . t0 I,r°n �n N N N n W W 0 �w W W W W W M M M �0) 0,) 01 01 0) M O O i O O O OOO O O eri°ei ei c,-1 O1 c-I c-I
rI r-1r-I r-r--I rI rI rI r-I rI N NrrrMi ap rI ro OrOro O o O ro o N N N N N
n c n c on a
OCL
n a c c c on c c on a c crL
,LL Q aNO Li Q aNO Li Q aNO Li Q aNO Li Q aNO Li Q aNO Li Q aNO Li Q aNO
P1
Well
iP3
P7

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