0601_Avery_MWSLF_Feb2020LFG_FID1393979_20200310

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SMITH+GARONER
ENGINEERS
i• - I • •
•S � F • : Li i i♦
ADORESS TEL WEB
14 N. Boylan Avenue, Raleigh NC 27603 919.828.0577 www.smithgardnerinc.com
FE fno A ia-sjTblitaing, . • T: a •e'o•• 'a'• EAU
AGuty / •: 0 • • Fb• •
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 (O&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 February 2020. Site details are provided below.
ROW �` �f I:.
Well field and flare station data are provided in the attached Tables 1 through 6.
LFG Extraction Well Field
cc W 1 through W 10: S+G performed methane (CH4), oxygen (a), carbon dioxide
(CO2), and pressure monitoring. S+G previously identified several wellheads, W-4
through W-8, during the January 2020 monitoring event requiring repair or
replacement in the near future. S+G planned to replace damaged flexible hose
during this monitoring event, but was unable to due to unforeseen circumstances.
S+G continues to work with the County to identify wellfield maintenance issues,
and make repairs as necessary.
Flare Station
cc Condensate Tank: The condensate tank liquid level was observed and was at an
acceptable level during this site visit.
S+G performed monitoring of the perimeter LFG monitoring network during this event.
Results of the monitoring event are included in Attachment 1, and the data indicate only P-3
had an exceedance of the LEL. The concentration is approximately half the value it was in
January, indicating that the LFGCCS may be reducing migration in this area. It is believed the

DocuSign Envelope ID: 7EAA1 B2A-97A3-43E0-981 D-DFF65D6E7806
Ms. Drummond
March 10, 2020
Page 2 of 2
methane concentration is dropping as a result of the reconnection of active collection at P-3,
following system maintenance performed during the January 2020 monitoring event. S+G
was unable to monitor probe P-7 during this event due to elevated liquid levels within the
well casing. S+G was unable to repair at the time of monitoring, but intends to correct the
issue during the March 2020 monitoring event. 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.
1414,1449
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 March 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,
9VIlHC I I�
`��p�wuurrrrN,�
\CAR0�%,,,
ODocuSigned by: ` _ r?aP 9C•
SEAL
(n . 046707 1 z
8B13721B7E5F488... O
.ti r'
Spencer W. Hollomon, P.E. ,'2Q
Project Engineer, ext. 134 INzo
spencer mithgardnerinc.com
Attachments
cc: Eric Foster —Avery County
file
DocuSigned bye
B:
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,o% CAR
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a SEAL
1369
Joan A. Smyth, P.G. '%-4wA��
Senior Hydrogeologist ext. 221
Joan _ mithgardnerinc.com
H:\Projects\Avery County (NC)\02 AC Compliance\LFG Monitor ing\MS\M2020\02 February 2020\ Report\ Feb 2020 Avery MSW LFG Monitoring Report.docx
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1- � . a,�, �! •� A LEGEND
EXISTING LANDFILL GAS PROBE
• +• ® OFFSITE STRUCTURE TO BE
' •^ ■ MONITORED
,,. •�;�` REFERENCES
«• -A 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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SMITH GARDNER
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DIE February 25, 2020
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2/ 24/ 2020 12: 38
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2/ 24/ 2020 12:45
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*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. Overpul ling by adjacent extraction wells may also result
in negative pressure being displayed.
NR= not recorded

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DocuSign Envelope ID: 7EAA1 B2A-97A3-43E0-981 D-DFF65D6E7806
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
Date of Sampling: 2/24/2020
Name and Position of Sample Collector:
Permit Number: 06-01
NC Landfill Rule (.0500 or .1600): '0500
Seth C. Rickerts, Staff Geologist
Type and Serial Number of Gas Meter: Envision ENV100 1510204
Date and Time of Field Calibration: 2/24/2020 11:58 AM
Calibration Date of Gas Meter: 1 /2019
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: 35 F Barometric Pressure: 28.89 inHg General Weather Conditions: Snowy
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
Of4CH4
by
Vohlme
%02
%CO2
Notes
P-1
>60s
1207
>60s
0
0
0
20.9
0
P-2
>60s
1351
>60s
0
0
0
22.4
0.9
P-3
>60s
1338
>60s
256
256
13.3
10.3
12.6
P-4
>60s
1335
>60s
0
0
0
22.2
0.5
P-5
>60s
1331
>60s
0
0
0
22.2
0.3
P-6
>60s
1326
>60s
0
0
0
23.3
0
P-7
NA
NA
NA
NA
NA
NA
NA
NA
Watered In
P-8
>60s
1314
>60s
4
4
0.2
23.3
0.1
P-9
>60s
1345
>60s
0
0
0
20.8
0.9
P-10
>60s
1347
>60s
0
0
0
7.5
2.5
P-11
>60s
1341
>60s
4
4
0.2
20.4
1.1
P-12
>60s
1318
>60s
0
0
0
22.8
1.8
P-13
>60s
1546
>60s
0
0
0
6.7
11
Airport Structures
>60s
1550
>60s
0
0
0
23.9
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: L
Staff Geologist
SIGNATURE
TITLE

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DocuSign Envelope ID: 7EAA1 B2A-97A3-43E0-981 D-DFF65D6E7806
SMITH GARDNER
% CH4 by
Volume
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
nue-ZIL
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Installation of W9/P3
Connection Installation of P7/W8 and
P1/W10 Connection
(September 3, 2015)
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