0601_AveryCounty_MSWLF_Dec20LFG_FID1525978_20210119

DocuSign Envelope ID: 94A4E2BA-9F31-4125-90EE-104A49CBD747
SMITH{ GARDNER
ENGINEERS
January 18, 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 — December 2020
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 December 2020. 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: 94A4E2BA-9F31-4125-90EE-104A49CBD747
Ms. Drummond
January 18, 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 and W-10 had recorded oxygen levels
above 5% this sampling event. These two extraction wells will be evaluated for any
leaks or maintenance issues, which will be corrected, and continued to be
monitored and tuned as necessary during the January 2021 sampling event.
Flare Station
Gas quality measured at the flare is nominal with moderate 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 keep gas quality levels
nominal.
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
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 2.6% this month. This is below the LEL, and is slightly lower than previous
events. P-7 will continue to be monitored closely. Off -site monitoring probes, P-1, P-2, P-4, P-
6, P-9, P-10, P-12 and P-13 all exhibited methane concentrations of 0%. 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. Elevated levels
of oxygen were measured in two 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.

DocuSign Envelope ID: 94A4E2BA-9F31-4125-90EE-104A49CBD747
Ms. Drummond
January 18, 2021
Page 3of4
The next monitoring event is scheduled for January 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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Spencer W. Hollomon, P.E. %�' �`.FN ��'' 0
Project Engineer, ext. 134 �rr.t� ,R�W`�N,11`
SDencer(asmithaardnerinc.comuntn1%
Attachments
cc: Eric Foster - Avery County
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Joan A. Smyth, P.G. A. S
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H:\Projects\Avery County INCI\02 AC Compliance\LFG Monitoring\MSW\2020\12 December 2020onitoring Report.docx
1

DocuSign Envelope ID: 94A4E2BA-9F31-4125-90EE-104A49CBD747
Ms. Drummond
January 18, 2021
Page 4of4
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DocuSign Envelope ID: 94A4E2BA-9F31-4125-90EE-104A49CBD747
FIGURES

DocuSign Envelope ID: 94A4E2BA-9F31-4125-90EE-104A49CBD747
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a'' :,P • LEGEND
- T� � ' 1. • 04 0 EXISTING LANDFILL GAS PROBE
• +• ® OFFSITE STRUCTURE TO BE
' •^ ■ MONITORED
,,. •�;�` REFERENCES
«� 1. ADJACENT PROPERTIES ARE FROM AVERY COUNTY GIS MAPPING
DEPARTMENT.
rom
F.w' _• r 2. MONITORING WELL LOCATIONS FROM FIELD SURVEY DATED 1/14/08, BY
`pSURVEYING 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
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DocuSign Envelope ID: 94A4E2BA-9F31-4125-90EE-104A49CBD747
TABLES

DocuSign Envelope ID: 94A4E2BA-9F31-4125-90EE-104A49CBD747
SMITH GARDNER
TABLE 1
Avery County Closed MSW Landfill
Landfill Gas Collection and Control System Monitoring
December 2020
DATE: December 28, 2020
BY: MJL
Device10
Date/Time
CH4
C62
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
12/22/2020
62.6
26.6
1.1
9.6
48
-39.05
-39.11
0.045
0
0
-38.35
AVERY-W2
12/22/2020
69.5
24.5
0.5
5.5
53
-39.49
-39.68
0.207
0
0
-39
AVERY-W3
12/22/2020
67
25.5
0.9
6.6
56
-39.95
-40.02
0.222
0
0
-39.74
AVERY-W4
12/22/2020
38
17.1
0.7
44.2
54
-39.65
-39.84
0.002
0
0
-38.02
AVERY-W5
12/22/2020
38.7
26.4
0.9
33.9
53
-32.3
-32.28
0.435
0
0
-32.27
AVERY-W6
12/22/2020
7.2
15.4
7.6
69.8
56
-39.78
-39.78
0.044
0
0
-39.77
AVERY-W7
12/22/2020
42.2
26.3
0
31.5
55
-19.91
-19.85
0.167
0
0
-19.77
AVERY-W8
12/22/2020
49.6
33.8
0.2
16.4
54
-39.96
-39.98
0.005
0
0
-39.93
AVERY-W9
12/22/2020
51.4
24.8
0.1
23.6
55
-39.07
-39.14
-0.004
0
0
-38.57
AVERY-W10
12/22/2020
6.8
3.8
18.6
70.8
53
-14.62
-38.85
0.002
0
0
-38.02
Av-Flare
12/22/2020
29.7
19.1
6.8
37.5
58
3.43
3.49
-0.92
0
0
3.14
*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: 94A4E2BA-9F31-4125-90EE-104A49CBD747
ATTACH MENT 1
PERIMETER MONITORING PROBE DATA

DocuSign Envelope ID: 94A4E2BA-9F31-4125-90EE-104A49CBD747
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 1
Date of Sampling: 12/22/2020 NC Landfill Rule (.0500 or .1600): .050@500
Name and Position of Sample Collector: Michael J. Liebl - Staff Environmental Technician
Type and Serial Number of Gas Meter: GEM50001 G506472
Date and Time of Field Calibration: 12/22/2020, 1152
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: 10/2022
Pump Rate of Gas Meter: 0.5 LPM
Ambient Air Temperature: 48 F Barometric Pressure: 29.97 inHg 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/uLEL
Stabilized
01nLFL
11/XH4
by
Volume
%0-2
%IoCO2
Notes
H 2S p p m
P-1
>60s
1359
>60s
0
0
0.0
20.1
0.2
0
P-2
>60s
1404
>60s
0
0
0.0
19.8
0.1
0
P-3
>60s
1410
>60s
226
226
11.3
9.7
12.4
3
P-4
>60s
1416
>60s
0
0
0.0
19.6
0.5
1
P-5
>60s
1347
>60s
2
2
0.1
19.8
2.2
2
P-6
>60s
1335
>60s
0
0
0.0
20.2
1.6
2
P-7
>60s
1328
>60s
52
52
2.6
16.5
3.8
2
P-8
>60s
1320
>60s
4
4
0.2
18.3
2.3
1
P-9
>60s
1431
>60s
0
0
0.0
19.2
0.1
1
P-10
>60s
1435
>60s
0
0
0.0
20.0
0.1
1
P-11
>60s
1422
>60s
2
2
0.1
20.0
2.1
0
P-12
>60s
1324
>60s
0
0
0.0
19.9
1.7
2
P-13
>60s
1448
>60s
0
0
0.0
19.0
0.2
1
Airport Structures
>60s
1452
>60s
0
0
0.0
20.4
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 sign tptuecfroyroaldng any false statement, representation, or certification including the possibility of a fine and imprisonment.
COFF2284CA504F5...
Environmental Technician
SIGNATURE
TITLE

DocuSign Envelope ID: 94A4E2BA-9F31-4125-90EE-104A49CBD747
ATTACHMENT 2
HISTORICAL PERIMETER MONITORING PROBE TRENDS

DocuSign Envelope ID: 94A4E2BA-9F31-4125-90EE-104A49CBD747
M11111stMA11,111V
Avery County MSW Landfill
Landfill Gas Monitoring Well Network
Volume Rio by Methane Concentrations Between January 2014 and December 2020
By: MJL
Date: 12/28/2020
80.0
Installation of W9/P3
Connection
Installation of P7/W8
and P1/W10Connection
(September 11, 2014
P
(September 3, 2015)
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40.0
30.0
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Certificate Of Completion
Envelope Id: 94A4E2BA9F31412590EE104A49CBD747
Subject: Please DocuSign: December 2020 Avery MSW LFG Monitoring Report Final.pdf
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1/18/2021 9:43:46 AM
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Michael Liebl
[e-mail]
Environmental Technician
Smith Gardner, Inc.
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(None)
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Spencer W. Hollomon
[e-mail]
Project Engineer
Smith Gardner, Inc.
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Joan A. Smyth
[e-mail]
Vice President
Smith Gardner, Inc.
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