HomeMy WebLinkAbout0601_AveryCounty_MSWLF_March21LFG_FID1577720_20210422DocuSign Envelope ID: 29B3E3F7-9771-4B9E-9F98-76973FA97F9A
SMITH- GARDNER
ENGINEERS
April 22, 2021
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 — March 2021
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 March 2021. 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
April 22, 2021
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
has a wide variance across the wellfield. W-6, W-8, and W-10 had recorded oxygen
levels above 5% this sampling event. These three extraction wells were evaluated
for any leaks or maintenance issues, and none were observed. Further evaluation
as to the cause of the increased oxygen levels will continue, and repairs made as
necessary.
Flare Station
Gas quality measured at the flare is nominal with low levels recorded of methane, and
higher levels recorded of oxygen. The higher oxygen levels may be a result of higher
oxygen levels measured in the wellfield, and will be investigated further. The wellfield
will continue to be monitored, tuned, and maintained as necessary to identify potential
issues with the system and to improve gas quality levels.
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
• P-7
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 19.2% this month. This is above the LEL, and is higher than recent monitoring
events. P-7 will continue to be monitored closely. The remaining perimeter monitoring probes
were observed to have methane concentrations below the lower explosive limit (LEL).
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. Elevated levels
of oxygen were measured in three landfill gas extraction wells during this sampling event. S+G
DocuSign Envelope ID: 29B3E3F7-9771-4B9E-9F98-76973FA97F9A
Ms. Drummond
April 22, 2021
Page 3of4
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 April 2021. 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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Joan A. Smyth, P.G.
Senior Hydrogeologist ext.
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Ms. Drummond
April 22, 2021
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FIGURES
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LANDFILLAVERY COUNTY
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Opp • LEGEND
T� ' 1 • . 0 EXISTING LANDFILL GAS PROBE
• +• ® OFFSITE STRUCTURE TO BE
' •^ ■ MONITORED
,,. •�;�` 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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SMITH GARDNER
TABLE 1
Avery County Closed MSW Landfill
Landfill Gas Collection and Control System Monitoring
March 2021
DATE: March 25, 2021
BY: MA
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
3/24/2021
72.7
27
0.3
0
49.2
-42.3
-42.55
0.161
1.4
1
-38.5
AVERY-W2
3/24/2021
65.5
24.9
0.3
9.3
51.6
-41.12
-42.22
1.542
4.2
3.2
-40.39
AVERY-W3
3/24/2021
72.1
27.6
0.2
0.1
51.4
-42.21
-42.31
0.401
2.2
1.9
-42.35
AVERY-W4
3/24/2021
29.6
15.3
3.8
51.3
51.1
-43.02
-43.21
-0.095
«»
«»
-43.41
AVERY-W5
3/24/2021
37.7
27.3
0.2
34.8
52
-33.26
-33.31
0.672
2.6
2.6
-43.5
AVERY-W6
3/24/2021
8.1
15.4
7
69.5
51.3
-43.38
-43.4
-0.07
«»
«»
-43.28
AVERY-W7
3/24/2021
35.6
23
1.1
40.3
54.2
-25.31
-25.37
»»
N/A
N/A
-43.3
AVERY-W8
3/24/2021
12.8
7.4
18.1
61.7
50.6
-43.33
-43.34
-0.003
«»
«»
-43.31
AVERY-W9
3/24/2021
34.3
23
0.3
42.4
51.1
-42.13
-42.43
-0.003
«»
«»
-43.03
AVERY-W10
3/24/2021
16.5
7.9
16
59.6
51
-43.25
-43.28
-0.004
«»
«»
-43.27
Av-Flare
3/24/2021
0
0.2
20.8
79
75.9
0.69
0.76
0.329
12.8
9
1.23
*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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ATTACH MENT 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).
FacilityName: Arj g9Lkf-&P[Q,4eLdlM§ L990filLandf ill Permit Number: 06 Al-o l
Date of Sampling: 3/24/2021 NC Landfill Rule (.0500 or .1600): .050@500
Name and Position of Sample Collector:
Louis Krasuski - Staff Engineer
Type and Serial Number of Gas Meter: GEM5000, G506472
Date and Time of Field Calibration: 3/24/2021, 0730
Calibration Date of Gas Meter: 12/2020
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: 54 F Barometric Pressure: 27.21 in Hg General Weather Conditions: Sunny
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-imped (s)
InitW
o/iiLEL
Stabilized
%LF-L
11/XH4
by
V ohmle
%0_2
%6CG2
Notes
H 2S p p m
P-1
>60s
0940
>60s
0
0
0.0
19.2
1.4
2
P-2
>60s
0944
>60s
0
0
0.0
21.3
0.1
2
P-3
>60s
0935
>60s
194
194
9.7
12.6
8.6
2
P-4
>60s
0931
>60s
0
0
0.0
20.6
1.2
2
P-5
>60s
0923
>60s
0
0
0.0
20.0
1.5
2
P-6
>60s
0859
>60s
0
0
0.0
21.2
0.2
2
P-7
>60s
0916
>60s
384
384
19.2
0.3
11.0
2
P-8
>60s
0846
>60s
0
0
0.0
20.8
1.4
2
P-9
>60s
1142
>60s
0
0
0.0
19.6
1.2
0
P-10
>60s
1145
>60s
0
0
0.0
18.1
2.0
0
P-11
>60s
1134
>60s
0
0
0.0
18.5
1.7
0
P-12
>60s
0853
>60s
0
0
0.0
21.1
0.9
2
P-13
>60s
1153
>60s
0
0
0.0
9.8
7.5
1
Airport Structures
Inaccessible
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
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
I -_i_I I_i:__ _L\Alf) /fln
Connection Installation of P7/W8
and P1/W10 Connection
(September 11, 2014 (September3, 2015)
LIN
0.0
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ro ro ro ro ra N N N N N N N N N N
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v M 0- v U o v m a, M 0- Z) v U o v M v m 0- W U o v M v Q D v U o v m v M v U o v M v Q = W U o W M v a = � v U o v m v
LL 2 Q —, Q Ln O z 0— LL 2 Q Q In O Z 0— LL 2 Q Q (n O z 0— LL Q —, Q Ln O z 0— LL Q Q In O z 0— LL Q Q (n O z 0— LL Q O
� Q Ln Z 0 — LL �
Avery County MSW Landfill
Landfill Gas Monitoring Well Network
Methane Concentrations Between January 2014 and March 2021
By: MJL
Date: 3/25/2021
P1
Well
P3
P7
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