0601_AveryCounty_MSWLF_May22LFG_FID1684666_20220621

DocuSign Envelope ID: 6D12E9CE-1 FFO-4F44-AF49-3C9A2F54B724
SMITH GARDNER
ADDRESS TEL WEB
14 N. Boylan Avenue, Raleigh NC 27603 919.828.0577 www.smithgardnerinc.com
June 20, 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 — May 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 May 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: 6D12E9CE-1 FFO-4F44-AF49-3C9A2F54B724
Ms. Drummond
June 20, 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-1, W-2, W-3,
W-6 and W-8 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 14.6%, P-3 was 2.4%, and P-7 was 1.6%. Overall, the
three (3) probes with detectable levels of methane saw an increase in concentration from the
April 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. 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: 6D12E9CE-1 FFO-4F44-AF49-3C9A2F54B724
Ms. Drummond
June 20, 2022
Page 3 of 4
The next monitoring event is scheduled for June 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.
EDOCUSigned by:
O f i C
06424AAB97B4408...
Britt Ransom
Project Manager, ext. 301
britt(asmithaardnerinc.com
Attachments
cc: Eric Foster - Avery County
file
CAR'
4 ENS
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SEALp
�� 6/20 2
1369
DocuSigned by:
LO
B9779EBA711F488... A.
Joan A. Smyth, P.G. ,@&
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: 6D12E9CE-1 FFO-4F44-AF49-3C9A2F54B724
Ms. Drummond
June 20, 2022
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11011,19

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DocuSign Envelope ID: 6D12E9CE-1FF0-4F44-AF49-3C9A2F54B724
I
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T� ' 1 • . 0 EXISTING LANDFILL GAS PROBE
• +• ® OFFSITE STRUCTURE TO BE
' •^ ■ MONITORED li
,,. •�;�` 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: 6D12E9CE-1 FFO-4F44-AF49-3C9A2F54B724
TABLES

DocuSign Envelope ID: 6D12E9CE-1 FFO-4F44-AF49-3C9A2F54B724
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DocuSign Envelope ID: 6D12E9CE-1FF0-4F44-AF49-3C9A2F54B724
SMITH GARDNi
-09 ORO •
DIE June 20, 2022
BY DJ P
Lei ce I D
[ate
G-#
CU
C2
Bel ame
Irit.Tenperah.re
Irit.3atic
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F tessLre
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F tessae*
Irit.Rav
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%
%
%
%
deg F
i n Fi0
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i n F20
AVERY- W1
5/ 18/ 2022
0
0.2
21.5
78.3
80.5
-12.39
-12.84
0.04
6.4
6
- 31.79
AVERY- W2
5/ 18/ 2022
40.4
11.1
9.1
39.4
86
-1.08
- 7.4
0.04
7
N / R
- 32.96
AVERY- W3
5/ 18/ 2022
18.5
8.6
15.4
57.5
82.1
- 31.72
- 31.69
0.02
4.5
4.3
- 32.37
AVE RY- W4
5/ 18/ 2022
36.8
17.2
2
44
80.2
- 34.67
- 34.65
0.024
5.1
4.7
- 34.45
AVERY- W5
5/ 18/ 2022
37.8
25.3
1
35.9
70.5
- 32.93
- 32.91
0.618
2.5
1 2.5
- 34.89
AVERY- W6
5/ 18/ 2022
6.9
14.3
6.8
72
77.1
- 27.4
- 27.36
- 0.044
0
0
- 34.54
AVERY- W7
5/ 18/ 2022
12.7
19.1
2.2
66
85
-14.56
-14.53
1.178
0.5
0.5
- 0.06
AVERY- W8
5/ 18/ 2022
1.8
1.3
20.3
76.6
80.9
- 32.59
- 32.59
- 0.036
0
0
- 34.67
AVERY- W9
5/ 18/ 2022
69.5
25.4
1
4.1
85.4
- 31.91
- 31.91
0.37
2
1.9
N R
AVERY- W10
5/ 18/ 2022
70.2
27.2
0.4
2.2
81.4
- 32.04
- 32.08
0.244
1.7
1.6
N R
Av-Flare
5/18/2022
14.1
11.1
11.1
63.7
81.5
-36.58
-36.54
N/R
N/R
N/R
NR
*The differential pressure measurement should be positive. A negative differential pressure may indicate no gas flow. Negative
differential pressure can bethe result of dirt or water obstructing the pitot tube perforations. OverpuIIing by adjacent extraction wells
may also result in negative pressure being displayed.
NR= not recorded

DocuSign Envelope ID: 6D12E9CE-1FF0-4F44-AF49-3C9A2F54B724
ATTACH MEN T1
PERIMETER MONITORING PROBE DATA

DocuSign Envelope ID: 6D12E9CE-1 FFO-4F44-AF49-3C9A2F54B724
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DocuSign Envelope ID: 6D12E9CE-1FF0-4F44-AF49-3C9A2F54B724
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: 5/18/2022 NC Landfill Rule( 0500 or 160ft .0500
Name and Position of Sample Collector:
Britt Ransom, Project Manager
Type and Serial Number of Gas Meter: GEM5000, G506472
Date and Time of Field Calibration: 5/18/2022, 1530
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: 10/2023
Pump Rate of Gas Meter: 0.5 LPM
Ambient Air Temperature: 85 F Barometric Pressure: 29.96 in Hg General Weather Conditions: Partly 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
Pumped (s)
Initial
° ZEL
Stabilized
°,,ZEL
Of4CH4
by
N"ohime
%02
%CO2
Notes
H 2 S p p m
P-1
>60s
1726
>60s
292
292
14.6
13.2
8.3
0
P-2
>60s
1553
>60s
0
0
0.0
20.3
0.0
0
P-3
>60s
1558
>60s
48
48
2.4
17.0
3.6
0
P-4
>60s
1603
>60s
0
0
0.0
19.0
1.7
0
P-5
>60s
1609
>60s
0
0
0.0
18.6
2.0
0
P-6
>60s
1616
>60s
0
0
0.0
17.6
3.0
0
P-7
>60s
1623
>60s
32
32
1.6
3.3
11.9
0
P-8
>60s
1632
>60s
0
0
0.0
20.0
1.6
0
P-9
>60s
1541
>60s
0
0
0.0
19.3
1.2
0
P-10
>60s
1537
>60s
0
0
0.0
16.9
3.1
0
P-11
>60s
1546
>60s
0
0
0.0
17.4
2.4
0
P-12
>60s
1627
>60s
0
0
0.0
21.0
0.1
0
P-13
>60s
1735
>60s
0
0
0.0
10.3
8.2
0
Airport Structures
>60s
1740
>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.
E DocuSigned by:
2j\ r `
06424AAB97B4408...
SIGNATURE
Project Manager
TITLE

DocuSign Envelope ID: 6D12E9CE-1 FFO-4F44-AF49-3C9A2F54B724
ATTACHMENT 2
HISTORICAL PERIMETER MONITORING PROBE TRENDS

DocuSign Envelope ID: 6D12E9CE-1 FFO-4F44-AF49-3C9A2F54B724
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DocuSign Envelope ID: 6D12E9CE-1 FFO-4F44-AF49-3C9A2F54B724
SMITH GARDNER
% CH4 by
Volume
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
41
�oj a 0 AA CAY, F. Mg fl
0) j% - W-A-11
to 1 — to 9 — to 9 — N 1— N 1 N N N
By: DJP
Date: 6/20/2022
P1
Wei I
P3
P7