0601_AveryCounty_MSWLF_Oct20LFG_FID1517668_20201216

DocuSign Envelope ID: 161FDFCD-79C2-478B-8A89-7DD64E7C700A
SMITH, GARDNER
ENGINEER
December 4, 2020
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 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 October 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: 161FDFCD-79C2-478B-8A89-7DD64E7C700A
Ms. Drummond
December 4, 2020
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,
there is a wide range of gas quality measured across the wellfield. Several wells
have high (greater than 5%) concentration of oxygen. November's gas readings
indicate that this month's readings were anomalous and may have been due to
meter issues. During the November sampling event, all wells measured oxygen
levels below 5%. During this sampling event, S+G identified a leak on the
condensate tank and corrected it by installing a two-way condensate check valve.
This fix has led to lower oxygen levels being measured at the flare station.
Flare Station
Gas quality measured at the flare is nominal with moderate 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 bring the gas quality to better levels, specifically regarding oxygen
content.
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 3.4% this month. This is below the LEL, but is elevated from previous
events. P-7 will continue to be monitored closely. 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. S+G will
continue to monitor the methane concentrations at the site monthly, and advise the County
on repairs required to maintain an effective collection system.

DocuSign Envelope ID: 161FDFCD-79C2-478B-8A89-7DD64E7C700A
Ms. Drummond
December 4, 2020
Page 3of4
The next monitoring event is scheduled for November 2020
require additional information, please contact us at
919-828-0577 or by e-mail (address below).
Sincerely,
SMITH GARDNER, INC.
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8B13721KE51`488 S -13 ' : O
Spencer W. Hollomon, P.E. `FNGINe�'
Project Engineer, ext. 134 ''��R1fr�W�ln111-110N\\\`\`\
spencerldsmithgardnerinc.com
Attachments
cc: Eric Foster - Avery County
file
. If you have any questions, or
your earliest convenience at
DocuSigned by: '
B9779EBA711F488...
a° 7
�F,�'.�L 12/ 2
1369
Joan A. Smyth, P.G. 'N,l
Senior Hydrogeologist ext.
0oanldsmithgardnerinc.com
H:\Projects\Avery County (NCI\02 AC Compliance\LFG Monitoring\MSW\2020\10 October 2020\October 2020 Avery MSW LFG Monitoring Report.docx
F11

DocuSign Envelope ID: 161FDFCD-79C2-478B-8A89-7DD64E7C700A
Ms. Drummond
December 4, 2020
Page 4of4
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DocuSign Envelope ID: 161FDFCD-79C2-478B-8A89-7DD64E7C700A
FIGURES

DocuSign Envelope ID: 161FDFCD-79C2-478B-8A89-7DD64E7C700A
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DocuSign Envelope ID: 161 FDFCD-79C2-478B-8A89-7DD64E7C700A
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'• A LEGEND
T� ' . • 0 EXISTING LANDFILL GAS PROBE
• +• ® OFFSITE STRUCTURE TO BE
' •^ ■ MONITORED
,,. •�;�` REFERENCES
«� Q 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.
a}4F 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
a A. �' �� � � � ; SURVEYED AND ARE APPROXIMATE.
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DocuSign Envelope ID: 161FDFCD-79C2-478B-8A89-7DD64E7C700A
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DocuSign Envelope ID: 161FDFCD-79C2-478B-8A89-7DD64E7C700A
TABLES

DocuSign Envelope ID: 161FDFCD-79C2-478B-8A89-7DD64E7C700A
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DocuSign Envelope ID: 161 FDFCD-79C2-478B-8A89-7DD64E7C700A
SMITH GARDNER
DIE October 28, 2020
BY MJ L
D)i oe I D
DEW Trre
CI #
C,'P
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Irrt.Tenperah.re
Irit. Satic
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AVERY- W1
10/28/2020
59.6
22.7
13.3
4.4
62
- 38.53
- 38.87
0.16
1.3
1.1
- 38.45
AVERY- W2
10/28/2020
53
23.6
18.3
5.1
63
- 38.47
- 38.65
0.295
1.7
1.6
- 38.3
AVERY-W3
10/28/2020
69.8
16.2
14
0
64
22.53
22.6
0.028
0.6
0.6
21.78
AVERY- W4
10/28/2020
46.6
15.8
13.9
23.7
64
- 38.89
- 39.01
- 0.032
«»
«»
- 36.5
AVERY- W5
10/28/2020
33.1
31.1
1 18.9
16.9
64
- 31.45
- 31.46
0.782
2.7
2.7
- 31.37
AVERY- W6
10/28/2020
9.2
15.9
9.3
65.6
64
- 36.39
- 36.6
0.085
17.2
26.3
- 36.21
AVERY- W7
10/28/2020
15.6
20.3
5.1
59
65
- 32.97
- 33.03
2.37
0.7
0.7
- 32.83
AVERY- W8
10/28/2020
15.6
18.6
17
48.8
64
- 39.62
- 39.55
- 0.017
«»
«»
- 39.52
AVERY- W9
10/28/2020
54.7
27.1
16.3
1.9
63
- 39.22
- 39.27
- 0.028
«»
«»
- 38.94
AVERY-W10
10/28/2020
42.3
40.4
17.8
N/A
63
2.17
2.35
-0.021
«»
«»
0.86
Av-Flare
1 10/28/2020
1 19.3
1 18.4
14.2
48.1
1 65
1 2.23
1 2.21
1 -1.055
0
0
1 2.18
*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. Over puIIing by adjacent extraction wells may
also result in negative pressure being displayed.
NR= not recorded

DocuSign Envelope ID: 161FDFCD-79C2-478B-8A89-7DD64E7C700A
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DocuSign Envelope ID: 161FDFCD-79C2-478B-8A89-7DD64E7C700A
ATTACH MENT 1
PERIMETER MONITORING PROBE DATA

DocuSign Envelope ID: 161FDFCD-79C2-478B-8A89-7DD64E7C700A
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DocuSign Envelope ID: 161FDFCD-79C2-478B-8A89-7DD64E7C700A
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: 10/28/2020 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: GEM 5000 G506472 Calibration Date of Gas Meter: 2/2020
Date and Time of Field Calibration: 09/28/2020, 1048
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: 52 F Barometric Pressure: 27.43 inHg General Weather Conditions: Rainy
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
Locaiion or
LFG Well ID
Sample Tube
Purge
Time
Time
Pumped (s)
Initial
°,ZEL
Stabilized
°,,ZEL
Of CH4
by
Volume
%02
9foCO2
Notes
H 2S p p m
P-1
>60s
1507
>60s
0
0
0.0
19.7
0.1
1
P-2
>60s
1512
>60s
0
0
0.0
19.6
0.1
1
P-3
>60s
1519
>60s
270
270
13.5
9.2
11.7
3
P-4
>60s
1526
>60s
0
0
0.0
20.1
1.2
2
P-5
>60s
1455
>60s
0
0
0.0
20.1
1.6
1
P-6
>60s
1451
>60s
0
0
0.0
18.8
2.0
2
P-7
>60s
1442
>60s
68
68
3.4
15.3
3.4
2
P-8
>60s
1445
>60s
4
4
0.2
16.7
4.4
1
P-9
>60s
1540
>60s
0
0
0.0
19.2
0.6
1
P-10
>60s
1543
>60s
0
0
0.0
19.4
0.2
1
P-11
>60s
1533
>60s
0
0
0.0
18.1
1.3
2
P-12
>60s
1447
>60s
0
0
0.0
19.6
1.5
2
P-13
>60s
1552
>60s
2
2
0.1
19.8
0.5
1
Airport Structures
>60s
1556
>60s
0
0
0.0
19.8
0.0
1
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.
Seth C. Rickerts, S+G Geologist
SIGNATURE
TITLE

DocuSign Envelope ID: 161FDFCD-79C2-478B-8A89-7DD64E7C700A
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DocuSign Envelope ID: 161FDFCD-79C2-478B-8A89-7DD64E7C700A
ATTACHMENT 2
HISTORICAL PERIMETER MONITORING PROBE TRENDS

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DocuSign Envelope ID: 161FDFCD-79C2-478B-8A89-7DD64E7C700A
AuI1C<h!IAi1il17IV
Avery County MSW Landfill
Landfill Gas Monitoring Well Network
Volume Rio by Methane Concentrations Between January 2014 and October 2020
By: MJL
Date: 10/28/2020
80.0
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Installation of P7/W8
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(September 11, 2014
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(September 3, 2015)
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DocuSign Envelope ID: 161FDFCD-79C2-478B-8A89-7DD64E7C700A
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Certificate Of Completion
Envelope Id: 161 FDFCD79C2478B8A897DD64E7C700A
Subject: Please DocuSign: October 2020 Avery MSW LFG Monitoring Report.pdf
Source Envelope:
Document Pages: 20 Signatures: 2
Certificate Pages: 2 Initials: 0
AutoNav: Enabled
Envelopeld Stamping: Enabled
Time Zone: (UTC-08:00) Pacific Time (US & Canada)
Record Tracking
Status: Original
12/4/2020 6:01:56 AM
Signer Events
Spencer W. Hollomon
[e-mail]
Project Engineer
Smith Gardner, Inc.
Security Level: Email, Account Authentication
(None)
Electronic Record and Signature Disclosure:
Not Offered via DocuSign
Joan A. Smyth
[e-mail]
Vice President
Smith Gardner, Inc.
Security Level: Email, Account Authentication
(None)
Electronic Record and Signature Disclosure:
Not Offered via DocuSign
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Michael Liebl
[e-mail]
Environmental Technician
Smith Gardner, Inc.
Security Level: Email, Account Authentication
(None)
Electronic Record and Signature Disclosure:
Not Offered via DocuSign
Holder: Michael Liebl
[e-mail]
Signature
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Status: Completed
Envelope Originator:
Michael Liebl
14 N. Boylan Ave
Raleigh, NC 27603
[e-mail]
IP Address: 24.106.183.110
Location: DocuSign
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