0601_AveryCounty_MSWLF_Mar22LFG_FID1684604_20220620

DocuSign Envelope ID: 4101A94C-8E92-463C-81D5-8EA15E802EDB
SMITH GARDNER
ADDRESS TEL WEB
14 N. Boylan Avenue, Raleigh NC 27603 919.828.0577 www.smithgardnerinc.com
June 17, 2022
Ms. Jaclynne Drummond
NCDENR DWM Solid Waste Section
2090 U.S. 70 Highway
Swannanoa, North Carolina 28778-8211
RE: Operations, Monitoring, and Maintenance Report — March 2022
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. 06-011 Landfill Gas Collection and Control System (LFGCCS), and the perimeter
monitoring probes for March 2022. 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 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: 4101A94C-8E92-463C-81D5-8EA15E802EDB
Ms. Drummond
June 17, 2022
Page 2 of 4
LFG Extraction Well Field
• W-1 through W-10: S+G performed methane (CH4), oxygen (02), and carbon dioxide
(CO2) monitoring as well as temperature and pressure monitoring. In general, gas
quality varies across the wellfield. All wells with the exception of 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
moderate levels recorded of oxygen. 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
detectable methane concentrations:
• P-1
• P-3
• P-7
Monitoring probes P-1, P-3, and P-7 all had observed concentrations above the lower explosive
limit (LEL); the concentration in P-1 was 29.7%, P-3 was 9.2%, and P-7 was 15.8%. Overall,
the three (3) probes with detectable levels of methane saw an increase in concentration from
the February 2022 monitoring event.
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.
CONCLUSIONS
In general, the landfill gas extraction system continues to operate nominally. The landfill gas
extraction wells will continue to be tuned to limit oxygen into the system. The increase in CH4
observed in monitoring probes P-1, P-3, and P-7 will continue to be monitored closely. 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.

DocuSign Envelope ID: 4101A94C-8E92-463C-81D5-8EA15E802EDB
Ms. Drummond
June 17, 2022
Page 3 of 4
The next monitoring event is scheduled for April 2022. 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.
E
�IQ,�i e.i V {QVLil�.ie.0
DocuSigned by:
SDD73DOAEAB2442..
Daniel J. Pantaleo
Environmental Technician, ext. 140
daniel(asmithaardnerinc.com
Attachments
cc: Eric Foster - Avery County
file
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Do"cuuSigned by:
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Joan �. SmytBh, P.G. A
Senior Hydrogeologist ext. 221
ioan(dsmithoardnerinc.com
H:\Projects\Avery County INCI\02 AC Compliance\LFG Monitoring\MSW\2022\02 February 2022\February 2022 Avery MSW LFG Monitoring Report.docx
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DocuSign Envelope ID: 4101A94C-8E92-463C-81D5-8EA15E802EDB
Ms. Drummond
June 17, 2022
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11011,19

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DocuSign Envelope ID:4101A94C-8E92-463C-81D5-8EA15E802EDB
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,,. •�;�` 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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DocuSign Envelope ID: 4101A94C-8E92-463C-81D5-8EA15E802EDB
TABLES

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DocuSign Envelope ID: 4101A94C-8E92-463C-81D5-8EA15E802EDB
SMITH GARDNER
TABLE 1
Avery County Closed MSW Landfill
Landfill Gas Collection and Control System Monitoring
March 2022
DATE: March 30, 2022
BY: MA
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
3/16/2022
72.8
27.2
0
NR
51.9
-40.18
-40.25
0.174
1.4
1.4
-39.86
AVERY-W2
3/16/2022
79.8
20.2
0
NR
50.5
-2.57
-2.59
0.011
0.4
0.4
-2.45
AVERY-W3
3/16/2022
70.1
27.8
0
NR
51.8
-39.56
-39.73
0.34
2
1.7
-39.54
AVERY-W4
3/16/2022
60.5
21.3
0
18.2
50.7
-40.64
-40.69
0.008
4.2
2
-39.52
AVERY-W5
3/16/2022
39.7
27.6
1 0
32.7
50.8
-37.9
-37.89
0.828
2.9
1 2.9
-37.91
AVERY-W6
3/16/2022
7.3
17.4
6
69.3
51.7
-31.75
-31.84
0.008
7.2
8.8
-31.13
AVERY-W7
3/16/2022
43.4
20.6
0
36
51.3
-1.74
-5.99
0.002
0
1.1
-8.48
AVERY-W8
3/16/2022
47.9
32.8
0.5
18.8
49.9
-40.3
-40.27
-0.01
«»
«»
-40.02
AVERY-W9
3/16/2022
50.1
25.2
0
24.7
51.3
-30.96
-21.61
-0.011
«»
«»
-4.91
AVERY-W10
3/16/2022
66.8
33.2
0
NR
53.3
1.16
1.25
-0.003
«»
«»
0.83
Av-Flare
3/16/2022
1 18.6
1 15.5
9.4
1 56.5
1 50.5
1 1.46
1 1.44
1 0.87
74
64.4
1 1.44
i
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*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

DocuSign Envelope ID:4101A94C-8E92-463C-81D5-8EA15E802EDB
ATTACH MEN TI
PERIMETER MONITORING PROBE DATA

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DocuSign Envelope ID: 4101A94C-8E92-463C-8lD5-8EA15E802EDB
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).
Facility Name: Avery County Closed MSW Landfill Permit Number: 06-01
Date of Sampling: 3/16/2022 NC Landfill Rule (.0500 or .1600): .0500
Name and Position of Sample Collector: Michael J. Liebl, Staff Environmental Technician
Type and Serial Number of Gas Meter: GEM5000, G506472
Date and Time of Field Calibration: 3/16/2022, 1016
Calibration Date of Gas Meter: 12/2021
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: 48 F Barometric Pressure: 27.23 in Hg General Weather Conditions: 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
Pumped (s)
Initial
°,ZEL
Stabilized
°,,ZEL
Of4L-H4
by
N"ohlme
%02
%CO2
Notes
H 2 S p p m
P-1
>60s
1132
>60s
594
594
29.7
7.6
13.4
0
P-2
>60s
1135
>60s
0
0
0.0
18.4
5.3
0
P-3
>60s
1138
>60s
184
184
9.2
5.5
8.2
0
P-4
>60s
1142
>60s
0
0
0.0
19.7
0.6
0
P-5
>60s
1124
>60s
0
0
0.0
19.3
0.2
0
P-6
>60s
1118
>60s
0
0
0.0
16.4
4.7
0
P-7
>60s
1114
>60s
316
316
15.8
0.9
5.1
0
P-8
>60s
1110
>60s
0
0
0.0
18.1
3.2
0
P-9
>60s
1148
>60s
0
0
0.0
18.5
1.4
0
P-10
>60s
1150
>60s
0
0
0.0
19.9
0.8
0
P-11
>60s
1145
>60s
0
0
0.0
17.2
4.5
0
P-12
>60s
1112
>60s
0
0
0.0
19.6
3.0
0
P-13
>60s
1158
>60s
0
0
0.0
16.1
5.9
0
Airport Structures
>60s
1154
>60s
0
0
0.0
20.3
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.
igned� by:
EJ V i wu� ,Kj. ,,
...
SIGNATURE
Staff Environmental Technician
TITLE

DocuSign Envelope ID: 4101A94C-8E92-463C-81D5-8EA15E802EDB
ATTACHMENT 2
HISTORICAL PERIMETER MONITORING PROBE TRENDS

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DocuSign Envelope ID: 4101A94C-8E92-463C-81D5-8EA15E802EDB
M11111stMA11,111V
% CH4 by
Volume
80.0
70.0
60.0
50.0
40.0
30.0
Installation of W9/P3
Connection Installation of P7/W8
(Se tember 11, 2014 and P1/W10Connection
P (September 3, 2015)
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By: MJL
Date: 3/30/2022
Avery County MSW Landfill
Landfill Gas Monitoring Well Network
Methane Concentrations Between January 2014 and March 2022
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