0601_AveryCounty_MSWLF_April20LFG_FID1422550_20200714

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SMITH GARDNER
ADDRESS TEL WEB
14 N. Boylan Avenue, Raleigh NC 27603 919.828.0577 www.smithgardnerinc.com
July 14, 2020
Ms, Jaclynne Drummond
NCDENR DWM Solid Waste Section
2090 U.S. ?0 Highway
Swannanoa, North Carolina 28??8-8211
RE: Operations, Monitoring, and Maintenance Report — April 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. 06-011 Landfill Gas Collection and Control System (LFGCCS), and the perimeter
monitoring probes for April 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.

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Ms. Drummond
July 14, 2020
Page 2of4
LFG Extraction Well Field
• W-1 through W-10: S+G performed methane (CH4), oxygen (02), carbon dioxide
(CO2), and pressure monitoring; flows were not recorded during this sampling
event. In general, most wells were observed to have good gas quality, with the
exception of W-9. W-9 appears to be reading close to atmospheric gas
concentrations. S+G suspects a leak at W-9, and will investigate and make repairs
as necessary. The available vacuum across the system is maintaining at
approximately 35 inches of water, providing enough vacuum to operate the
wellfield.
Flare Station
Gas quality measured at the flare is nominal with low levels recorded of methane, and
high levels recorded of oxygen. Based on the gas readings in the wellfield, the levels of
methane recorded at the flare appear low. 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 and P-7 had an exceedance of the LEL. Both P-3
and P-7 are located on the landfill property, with P-3 located generally north of the landfill and
P-7 located generally southwest of the landfill. P-3 was observed to have a concentration of
methane less than the previous month, while P-7 was observed to slightly increase in
concentration. The cause of the spike in P-7 is unknown but the concentration in this probe
will continue to be monitored for any changes. 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 May 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).

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Ms. Drummond
July 14, 2020
Page 3of4
Sincerely,
SMITH GARDNER, INC.
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Spencer W. Hollomon, P.E. FNGrN��''
Project Engineer, ext. 134 %�Rl1r�wiil��H�,��zozo
spencer(asmithgardnerinc.com
Attachments
cc: Eric Foster -Avery County
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DocuSigned by:
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Joan A. Smyth, P.G. A. 12020
Senior Hydrogeologist ext.
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H:\Projects\Avery County (NC)\02 AC Compliance\LFG Mon itoring\MSW\2020\04 April 2020\April 2020 Avery MSW LFG Monitoring Report.docx

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Ms. Drummond
July 14, 2020
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FIGURES

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• T� ' 1.. 0 EXISTING LANDFILL GAS PROBE
• +• ® OFFSITE STRUCTURE TO BE
' • INA^ ■ MONITORED
,,. •�;�` p REFERENCES
«� 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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TABLES

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DocuSign Envelope ID: OF2BA5AA-363D-466A-A3A7-OOE5ACA3F4AD
SMITH GARDNER
TABLE 1
Avery County Closed MSW Landfill
Landfill Gas Collection and Control System Monitoring
April2020
DATE: April 23, 2020
BY: SCR
Devicel0
Date/Time
CH4
CO2
02
Balance
Init. Temperature
Init. Static
Pressure
Adj. Static
Pressure
In it. Diff.
Pressure*
Init. Flow
Adj. Flow
System
Pressure
mm/dd/yyyy
%
%
%
%
deg F
in H2O
in H2O
in H2O
Scfm
Scfm
in H2O
AVERY-W1
4/8/2020
71.9
27.9
0.3
-0.1
74
-35.59
-35.59
-0.043
NR
NR
-35.5
AVERY-W2
4/8/2020
68.1
24.9
0.2
6.8
71
-33.87
-33.87
-0.512
NR
NR
-35.57
AVERY- W3
4/8/2020
71.2
27.9
0.1
0.8
69.8
- 34.11
- 34.11
- 0.452
NR
NR
- 35.33
AVERY- W4
4/8/2020
78
22
0
0
77.5
1.4
1.4
- 0.009
NR
NR
- 35.03
AVERY- W5
4/8/2020
69.6
30.1
0.1
0.2
77.6
1.25
1.25
- 0.006
NR
NR
- 35.93
AVERY- W6
4/8/2020
68.6
30.4
0.1
0.9
78.7
0.92
0.92
- 0.005
NR
NR
- 35.92
AVERY- W7
4/8/2020
62.8
23.1
0.2
13.9
82.3
-1.75
-1.75
- 0.007
NR
NR
- 35.89
AVERY- W8
4/8/2020
65.6
33.9
0
0.5
69
- 29.15
- 29.15
0.005
NR
NR
- 31.73
AVERY- W9
4/8/2020
0.2
0.3
20.3
79.2
78.3
- 6.87
- 6.87
- 0.006
NR
NR
- 35.69
AVE RY-W10
4/8/2020
30.8
25.7
0.3
43.2
74.1
-35.61
-35.61
0.001
NR
NR
-35.75
Av-Flare
4/8/2020 0:00
20.9
10.7
13
55.4
NR
1.97
1.62
NR
NR
NR
NR
'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 1
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).
Facility Name: Avery County Closed MSW Landfill Permit Number: 06-01
Date of Sampling: 04/08/2020 NC Landfill Rule (.0500 or .1600): .0500
Name and Position of Sample Collector: Seth C. Rickerts Staff Geologist
Type and Serial Number of Gas Meter: GEM 5000 Calibration Date of Gas Meter: 1/2020
Date and Time of Field Calibration: 04/08/2020 1046
Type of Field Calibration Gas (15115 or 35/50): 15/15 Expiration Date of Field Calibration Gas Canister: 10/2020
Pump Rate of Gas Meter: 0.5 LPM
Ambient Air Temperature: 55 F Barometric Pressure: 26.89 inHg General Weather Conditions: 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
Locafion or
LFG Well ID
Sample Tube
Purge
Time
Time
Pumped (s)
Initial
°,ZEL
Stabilized
°,,ZEL
Of CH4
by
Vohlme
%02
%CO2
Notes
H 2 S [ p p m )
P-1
>60s
1233
>60s
0
0
0.1
20.9
0.1
0
P-2
>60s
1258
>60s
0
0
0.0
20.6
0.1
0
P-3
>60s
1300
>60s
144
144
7.2
13.4
8.9
0
P-4
>60s
1305
>60s
0
0
0.0
19.9
1.2
0
P-5
>60s
1309
>60s
0
0
0.0
19.2
1.6
0
P-6
>60s
1254
>60s
0
0
0.0
19.7
1.2
0
P-7
>60s
1252
>60s
188
188
9.4
2.1
7.6
0
P-8
>60s
1238
>60s
0
0
0.0
20.0
1.6
0
P-9
>60s
1321
>60s
0
0
0.0
19.3
1.2
0
P-10
>60s
1325
>60s
0
0
0.0
19.4
0.9
0
P-11
>60s
1317
>60s
0
0
0.0
17.7
2.2
0
P-12
>60s
1242
>60s
0
0
0.0
20.7
0.3
0
P-13
>60s
1248
>60s
0
0
0.0
20.2
0.1
0
Airport Structures
>60s
1158
>60s
0
0
0.0
21.2
0.0
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.
4�2 Staff Geologist, S+G
SIGNATURE
TITLE

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ATTACHMENT 2
HISTORICAL PERIMETER MONITORING PROBE TRENDS

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SMITH GARDNER
% CH4 by
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
Installation of W9/P3
Avery County MSW Landfill
Landfill Gas Monitoring Well Network
Methane Concentrations Between January 2014 and April 2020
By: SWH
Date: 7/14/2020
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