0601_AveryCounty_MSWLF_Sept20LFG_FID1472869_20201026

DocuSign Envelope ID: F2COF541-EE45-48F7-B8E9-3B917C855809
SMITH GARDNER
ABBRESS TEL WEB
14 N. Boylan Avenue, Raleigh NC 27603 919.828.0577 www.smithgardnerinc.com
October 26, 2020
Ms. Jaclynne Drummond
NCDFNR DWM Solid Waste Section
2090 U.S. ?0 Highway
Swannanoa, North Carolina 28??8-8211
RE: Operations, Monitoring, and Maintenance Report — September 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 September 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: F2COF541-EE45-48F7-B8E9-3B917C855809
Ms. Drummond
October 26, 2020
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 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. The cause of the increased
oxygen will be investigated and repaired as necessary.
Flare Station
Gas quality measured at the flare is nominal with low levels recorded of methane,
and high 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. Results indicate P-3 had an exceedance of the LEL. P-3 is located
on the landfill property, generally on the northern side of the landfill. P-3 was observed to
have a concentration of methane higher than the previous two months, but is fairly
consistent with past readings. P-3 typically has the highest methane concentrations each
month. The cause of the high concentrations found at P-3 is unknown but the concentrations
in this probe will continue to be monitored for any changes. It should be noted that during
previous monitoring events P-7 had high concentrations of methane but this monitoring
event did not. P-7 and P-13 were unable to be sampled this event due to being watered in (P-
7) and active airport construction (P-13). 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.
The next monitoring event is scheduled for October 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).

DocuSign Envelope ID: F2COF541-EE45-48F7-B8E9-3B917C855809
Ms. Drummond
October 26, 2020
Page 3 of 4
Sincerely,
SMITH GARDNER, INC.
OtUN1utit111rrrri
DocuSignedby: — SEAL 10/•,�6/ 020
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SpencerW. Hollomon, P.E."?' C) S,FNGrNfie•'°
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Project Engineer, ext. 134 ''4�Rlfrw�in�H0��\\`
spencer(asmithgardnerinc.com
Attachments
cc: Eric Foster - Avery County
file
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DocuSigned by: 1369
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Joan A. Smyth, P.G. A.
Senior Hydrogeologist ext..22
joan(asmithgardnerinc.com
H:\Projects\Avery County (NCI\02 AC Compliance\LFG Monitoring\MSW\2020\05 May 2020\May 2020 Avery MSW LFG Monitoring Report.docx

DocuSign Envelope ID: F2COF541-EE45-48F7-B8E9-3B917C855809
Ms. Drummond
October 26, 2020
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FIGURES

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DocuSign Envelope ID: F2COF541-EE45-48F7-B8E9-3B917C855809
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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.
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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: F2COF541-EE45-48F7-B8E9-3B917C855809
TABLES

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DocuSign Envelope ID: F2COF541-EE45-48F7-B8E9-3B917C855809
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TABLE 1
Avery County Closed MSW Landfill
Landfill Gas Collection and Control System Monitoring
September 2020
DATE: September 30, 2020
BY: MJL
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
9/30/2020
51.3
24.4
9.6
14.7
64
-30.58
-30.68
0.02
1.1
1.2
-30.69
AVERY-W2
9/30/2020
55.5
22.2
14.3
8
63
-29.83
-29.9
0.178
3.2
2.9
-27.72
AVERY-W3
9/30/2020
75.5
17
7.5
0
64
22.12
22.21
0.03
1.5
1.6
22.23
AVERY-W4
9/30/2020
62.5
31.3
6.2
0
65
8.06
8.26
-0.006
«»
«»
8.32
AVERY-W5
9/30/2020
42.6
26.4
4.3
26.7
64
-26.6
-26.61
»»
N/A
N/A
-26.6
AVERY-W6
9/30/2020
8.9
15.7
7.3
68.1
66
-29.23
-29.4
»»
N/A
N/A
-28.64
AVERY-W7
9/30/2020
27
25.2
8
39.8
64
-29.09
-29.17
»»
N/A
N/A
-29.17
AVERY-W8
9/30/2020
53.8
34.4
6.4
5.4
66
-31.63
-31.7
»»
N/A
N/A
-31.66
AVERY-W9
9/30/2020
66.7
26.6
0.7
6
62
-30.29
-30.34
-0.052
«»
«»
-30.34
AVERY-W10
9/30/2020
65.8
20.1
14.1
0
65
-30.51
-30.59
-0.015
«»
«»
-30.61
Av-Flare
9/30/2020
11.2
8.9
13.3
66.6
69
-31.56
-31.55
>>>>
N/A
N/A
-31.56
*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

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ATTACHMENT
PERIMETER MONITORING PROBE DATA

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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 g9Lkfh&P[Q,4eLdlM§ L990filLandf ill Permit Number: 06 Al-o l
Date of Sampling: 09/30/2020 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: GEM 5000 G506472
Date and Time of Field Calibration: 09/30/2020, 1048
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: 10/2020
Pump Rate of Gas Meter: 0.5 LPM
Ambient Air Temperature: 66 F Barometric Pressure: 27.21 Hg General Weather Conditions: Sunny/Clear
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
fi--nped (s)
InitW
OUEL
Stabilized
01nLFL
11/XH4
by
Volume
%0_2
%CO2
Notes
P-1
>60s
1253
>60s
0
0
0.0
20.3
0.2
H2S = 2
P-2
>60s
1259
>60s
0
0
0.0
20.4
0.2
H2S = 2
P-3
>60s
1303
>60s
338
338
16.9
7.2
14.6
H2S = 2
P-4
>60s
1308
>60s
0
0
0.0
19.4
1.8
H2S = 2
P-5
>60s
1241
>60s
0
0
0.0
18.6
2.0
H2S = 2
P-6
>60s
1231
>60s
0
0
0.0
17.6
2.5
H2S = 2
P-7
-
-
-
-
-
-
Watered In
P-8
>60s
1220
>60s
2
2
0.1
14.6
6.6
H2S = 3
P-9
>60s
1318
>60s
0
0
0.0
19.2
0.9
H2S = 2
P-10
>60s
1320
>60s
0
0
0.0
18.8
1.5
H2S = 2
P-11
>60s
1313
>60s
0
0
0.0
19.6
0.4
H2S = 1
P-12
>60s
1223
>60s
0
0
0.0
19.6
1.5
H2S = 3
P-13
-
-
-
-
-
-
Inaccessible
Airport Structures
>60s
1332
>60s
0
0
0.0
19.9
0.0
H2S = 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:
rnFF��nnrA
SIGNATURE
Staff Environmental Technician
TITLE

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ATTACHMENT 2
HISTORICAL PERIMETER MONITORING PROBE TRENDS

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SMITH GARDNER
% CH4 by
Volume
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
t i •
C-6 C w Q > U C-C on Q > . . . . . . � ;hN+zo �C;A V)Q oz> Uo L +'>U L2 QL> U
N°LL V)°LL U1LL ;V)°LLLL QzazaQoLLaQ0Z0 aQLL aaoz0 a<0
By: MJL
Date: 9/30/2020
Wei I

Certificate Of Completion
Envelope Id: F2COF541EE4548F7B8E93B917C855809
Subject: Please DocuSign: September 2020 Avery MSW LFG Monitoring Report.pdf
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10/26/2020 7:29:39 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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(None)
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Joan A. Smyth
[e-mail]
Vice President
Smith Gardner, Inc.
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14 N. Boylan Ave
Raleigh, NC 27603
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