0601_AveryCounty_MSWLF_Nov20LFG_FID1517669_20201216

DocuSign Envelope ID: 34E21AA1-0084-4533-A617-7B33F85D42D1
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 — November 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 November 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: 34E21AA1-0084-4533-A617-7B33F85D42D1
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, gas quality
levels measured across the well field are normal. During the previous sampling
event, several wells had high (greater than 5%) concentration of oxygen. This
month's readings indicate the previous oxygen concentrations were anomalous and
may have been due to meter issues. During the November sampling event, all wells
measured oxygen levels below 5%. During the October 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 recorded 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 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 4.2% this month. This is below the LEL, but is elevated from previous events.
P-7 will continue to be monitored closely. Off -site monitoring probes, P-1, 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. High levels of
oxygen were measured in several landfill gas extraction wells during the previous sampling
event, however, readings from November indicate these were anomalies and that the system

DocuSign Envelope ID: 34E21AA1-0084-4533-A617-7B33F85D42D1
Ms. Drummond
December 4, 2020
Page 3of4
is operating properly. 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 December 2020. 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,
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H:\Projects\Avery County (NCI\02 AC Compliance\LFG Monitori ng\MSW\2020\1 0 October 2020\October 2020 Avery MSW LFG Monitoring Report.docx

DocuSign Envelope ID: 34E21AA1-0084-4533-A617-7B33F85D42D1
Ms. Drummond
December 4, 2020
Page 4of4
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DocuSign Envelope ID: 34E21AA1-0084-4533-A617-7B33F85D42D1
FIGURES

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DocuSign Envelope ID: 34E21AA1-0084-4533-A617-7B33F85D42D1
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'1- A' : or • � A LEGEND
" T� ' . • 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.
goo - PROBE P-2, P-3, AND P-9 THROUGH P-13 LOCATIONS WERE NOT
7A. SURVEYED AND ARE APPROXIMATE.
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DocuSign Envelope ID: 34E21AA1-0084-4533-A617-7B33F85D42D1
TABLES

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DocuSign Envelope ID: 34E21AA1-0084-4533-A617-7B33F85D42D1
SMITH GARDNER
TABLE 1
Avery County Closed MSW Landfill
Landfill Gas Collection and Control System Monitoring
November 2020
DATE: November 30, 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
11/19/2020
70.4
28.4
0.5
0.7
68.4
-36.65
-35.9
»»
N/A
1.5
-36.23
AVERY-W2
11/19/2020
73.3
26.7
0
0
61.4
-36.49
-36.52
0.177
1.4
1.5
-36.71
AVERY-W3
11/19/2020
53.3
29.6
0
17.1
59.3
-36.79
-36.78
0.04
0.6
0.7
-36.61
AVERY-W4
11/19/2020
68.1
22.5
0
9.4
61
-29.84
-29.95
-0.038
«»
«»
-30.05
AVERY-W5
11/19/2020
37.8
27.6
0.1
34.5
69.7
-26.79
-26.08
0.578
2.4
2.2
-32.31
AVERY-W6
11/19/2020
7.5
16
7
69.5
70.6
-30.53
-30.52
0.076
16.1
14.5
-32.14
AVERY-W7
11/19/2020
16.1
20.2
3.1
60.6
59.2
-29.05
-12.14
0.518
0.3
0.1
-31.8
AVERY-W8
11/19/2020
52.2
34.9
0.5
12.4
66.2
-32.93
-32.94
-0.012
«»
«»
-32.94
AVERY-W9
11/19/2020
66.7
33.3
0
0
65.6
-26.41
-24.35
-0.042
«»
«»
-28.92
AVERY-W10
11/19/2020
82.3
17.7
0
0
62.1
10.25
-13.14
5.996
9.4
N/A
-27.44
Av-Flare
11/19/2020
32.3
18.4
5.3
44
63.4
2.62
2.65
-1.017
0
0
2.61
*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: 34E21AA1-0084-4533-A617-7B33F85D42D1
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DocuSign Envelope ID: 34E21AA1-0084-4533-A617-7B33F85D42D1
ATTACH MENT 1
PERIMETER MONITORING PROBE DATA

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DocuSign Envelope ID: 34E21AA1-0084-4533-A617-7B33F85D42D1
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: 11/11/2020 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: 11/11/2020, 1156
Calibration Date of Gas Meter: 2/2020
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: 68 F Barometric Pressure: 27.27 inHg General Weather Conditions: Overcast
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/iiLEL
Stabilized
01nLFL
11/XH4
by
Volume
%0_2
°/OCG2
Notes
H 2S p p m
P-1
>60s
1329
>60s
0
0
0.0
19.6
0.0
1
P-2
>60s
1335
>60s
0
0
0.0
19.9
0.1
1
P-3
>60s
1339
>60s
282
282
14.1
8.3
10.4
4
P-4
>60s
1347
>60s
2
2
0.1
19.4
0.2
2
P-5
>60s
1316
>60s
0
0
0.0
19.6
1.3
2
P-6
>60s
1305
>60s
0
0
0.0
19.7
1.5
2
P-7
>60s
1258
>60s
84
84
4.2
14.1
4.1
3
P-8
>60s
1251
>60s
8
8
0.4
18.7
2.6
1
P-9
>60s
1358
>60s
0
0
0.0
19.8
0.2
1
P-10
>60s
1402
>60s
0
0
0.0
19.8
0.2
1
P-11
>60s
1353
>60s
0
0
0.0
19.9
1.2
1
P-12
>60s
1255
>60s
0
0
0.0
19.8
2.0
1
P-13
>60s
1411
>60s
0
0
0.0
19.6
0.1
2
Airport Structures
>60s
1407
>60s
0
0
0.0
19.9
0.1
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.
DocuSigned by:
Mil tuu
rnFF��nnrn�naF�
SIGNATURE
Environmental Technician
TITLE

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DocuSign Envelope ID: 34E21AA1-0084-4533-A617-7B33F85D42D1
ATTACHMENT 2
HISTORICAL PERIMETER MONITORING PROBE TRENDS

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DocuSign Envelope ID: 34E21AA1-0084-4533-A617-7B33F85D42D1
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Avery County MSW Landfill
Landfill Gas Monitoring Well Network
Volume Rio by Methane Concentrations Between January 2014 and November 2020
By: MJL
Date: 11 /19/2020
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Certificate Of Completion
Envelope Id: 34E21AAlCO844533A6177B33F85D42D1
Subject: Please DocuSign: November 2020 Avery MSW LFG Monitoring Report.pdf
Source Envelope:
Document Pages: 20 Signatures: 3
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 6:04:56 AM
Signer Events
Michael Liebl
[e-mail]
Environmental Technician
Smith Gardner, Inc.
Security Level: Email, Account Authentication
(None)
Electronic Record and Signature Disclosure:
Not Offered via DocuSign
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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Holder: Michael Liebl
[e-mail]
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by:
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pwLu r K NbUaKow
8813721B7E5F488...
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ocuSigned by:
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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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