0601_AveryCoMSWLF_LFGM_FID1068060

November 17, 2017

Ms. Jaclynne Drummond
NCDENR DWM Solid Waste Section
2090 U.S. 70 Highway
Swannanoa, North Carolina 28778-8211

RE: Operations, Monitoring, and Maintenance Report –November 2017
Avery County Closed MSW Landfill
Spruce Pine, North Carolina

Dear Ms. Drummond:

Smith Gardner, Inc. (S+G) is pleased to present this report concerning the operation and
maintenance (O&M) of the Avery County Closed MSW Landfill (Permit No. 06-01) Landfill Gas
Collection and Control System (LFGCCS). Monitoring of the on- and off-site landfill gas
probes was also performed. Mr. Frank Terry with S+G performed the site visit on November
7, 2017. Site visit details are provided below.

LFG EXTRACTION WELL MONITORING PROGRAM

Monthly monitoring of the LFGCCS will continue and shall include the following items:

• CH4, O2, CO2, and pressure monitoring at each extraction well head;
• CH4, O2, CO2, and pressure monitoring at the flare station; and
• Adjustment of the LFGCCS to balance recovery and ensure safe system operation.

The County will maintain this LFGCCS and will continue to evaluate the effectiveness of
increased LFG recovery from the waste mass in alleviating off-site LFG migration. Results
from monthly monitoring events will be reported in accordance with the approved LFG
Monitoring Plan.

LFG EXTRACTION WELL MONITORING ACTIVITIES

Mr. Terry performed the flare station and well field monitoring on November 7, 2017. Initial
measurements indicated there was approximately 38 inches of available vacuum at the
vacuum blower inlet, resulting in approximately 32 inches of available vacuum at each of the
LFG wells across the well field. The results from this event are summarized below.
Recommended actions are underlined. Well field data and flare station data are provided in
the attached Table 1.

Ms. Drummond
November 17, 2017
Page 2 of 3

LFG Extraction Well Field

• W-1 through W-10: S+G performed methane (CH4), oxygen (O2), carbon dioxide
(CO2), and pressure monitoring. No wellhead valves adjustments were required
during this sampling event.

• Orifice Plates: S+G continues to evaluate orifice plate sizes at wells W-5, W-7, W-
9, and W-10 during each site visit. LFG flow potential at these locations continues
to remain stable, the correct orifice plate sizes are currently installed and no
further changes were made.

Flare Station

• Condensate Tank: The condensate tank was drained during this site visit. S+G
will continue to monitor the liquid level of the condensate tank.

• Filter Tank: The filter tank was drained during this site visit. S+G will continue to
monitor the liquid level of the filter tank.

• Flare operation: Due to low methane concentration of approximately 12%
measured at the flare, no active combustion was observed. The spark ignition
system was operational; however, flame ignition continues to be unsuccessful.
Also, as a result of condensate build up throughout the piping system, the flare
vacuum was found higher than normal at approximately 45”wc. After draining the
system, vacuum returned to normal at approximately 35”wc. S+G will continue
to adjust the system to optimize gas flow and quality.

LFG MONITORING WELL (PERIMETER) MONITORING PROGRAM
Mr. Terry performed monitoring of the perimeter LFG monitoring network during this event.
Monitoring Well P-3 exhibited a CH4 concentration reading of 17.8%, which exceeds the LEL
of 5%. Monitoring Wells P-1, P-4, P-6, and P-7 exhibited CH4 concentration readings of 3.2%,
0.1%, 0.1%, and 3.6% respectively which do not exceed the LEL of 5%. Due to a meter
malfunction and weather conditions, the data for P-13 was not saved. The other wells,
monitored during this event, had no detectable concentrations of CH4. Results of this
monitoring event are included in Attachment 1. Attachment 2 provides a CH4 concentration
graph over time for monitoring wells that have historically had methane present. The
current well network will continue to be monitored and data will be reported to NCDEQ and
the County.

Ms. Drummond
November 17, 2017
Page 3 of 3

CONCLUSIONS

The sudden increase in CH4 concentration at P-3 is likely a result of a condensate blockage
found during this monitoring event in the attached vacuum lateral which completely
restricted gas flow. The lateral was drained and vacuum was restored to P-3. Based on the
previous history of this probe, the CH4 concentration should return to compliant levels during
the December 2017 monitoring event. We will continue to monitor the CH4 concentrations at
the site monthly.

The next routine monitoring event is scheduled for December 2017. 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.

Frank Terry Madeline German, P.G.
Project Manager, ext. 142 Project Geologist ext. 222
[e-mail] [e-mail]

Attachments

cc: Eric Foster – Avery County
Kris Riddle – NCDEQ
file

H:\Projects\Avery County (NC)\Avery-15-1 (LFG Sys Ops)\2017 LFG Monitoring\11 Nov 2017\Avery Co MSW LFG Monitoring Rpt November 2017.docx

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Attachment 1

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TABLE

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DATE:
BY:FAT
Date/Time CH4 CO2 O2 Balance Init. Temperature Init. Static
Pressure
Adj. Static
Pressure
Adj. 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 11/7/2017 10:51 61.7 26.1 0.0 12.2 60 -42.6 -42.6 0.0 0.0 0.0 -42.7
AVERY-W2 11/7/2017 10:47 43.8 24.6 0.4 31.2 63 -43.0 -42.7 0.0 0.0 0.0 -42.7
AVERY-W3 11/7/2017 10:34 52.5 25.9 0.4 21.2 63 -42.7 -42.7 0.2 0.1 0.3 -42.3
AVERY-W4 11/7/2017 11:08 38.8 20.6 2.4 38.2 59 -42.3 -42.1 0.0 0.0 0.0 -42.3
AVERY-W5 11/7/2017 11:19 27.1 23.0 0.5 49.4 62 -41.7 -41.7 0.8 2.5 2.7 -42.3
AVERY-W6 11/7/2017 12:09 11.9 18.5 3.1 66.5 68 -8.3 -8.4 0.0 15.7 14.7 -42.5
AVERY-W7 11/7/2017 11:16 5.0 12.4 7.8 74.8 66 -10.4 -10.6 5.4 1.8 1.8 -42.3
AVERY-W8 11/7/2017 12:13 48.4 34.2 0.0 17.4 59 -42.7 -42.6 0.0 0.0 0.0 -42.3
AVERY-W9 11/7/2017 10:56 47.9 25.5 2.3 24.3 62 -42.7 -42.7 0.0 0.2 0.1 -42.5
AVERY-W10 11/7/2017 11:03 55.5 31.0 0.1 13.4 58 -42.6 -42.3 0.0 0.1 0.1 -42.3
Av-Flare 11/7/2017 12:41 11.7 7.5 13.9 66.9 NR -35.7 -35.8 33.4 NR NR 0.0
Av-Flare 11/7/2017 12:43 10.8 7.3 12.1 69.8 NR 1.1 0.9 3.0 27.0 33.0 0.0
NR= not recorded
Landfill Gas Collection and Control System Monitoring
November 2017
*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.
November 7, 2017
Avery County Closed MSW Landfill
TABLE 1
Device ID
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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: ______________________________________________ Permit Number: ____________________________
Date of Sampling: ___________________ NC Landfill Rule (.0500 or .1600): _____________________________________
Name and Position of Sample Collector: _________________________________________
Type and Serial Number of Gas Meter: _______________________________ Calibration Date of Gas Meter: ___________
Date and Time of Field Calibration: _____________________
Type of Field Calibration Gas (15/15 or 35/50): ____________ Expiration Date of Field Calibration Gas Canister: ________
Pump Rate of Gas Meter: _____________
Ambient Air Temperature: __________ Barometric Pressure: ______________ General Weather Conditions: _____________
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
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.
__________________________________ ________________________
SIGNATURE TITLE
___________________________________________________________________________
Person County Closed MSW Landfill 73-01
.0500
Avery County Closed MSW Landfill 06-01
11/7/17 .0500
Frank Terry S+G
Envision ENV100 1510204 12/2016
11/6/17 15:46 PM
10/2018
/30
62 30.06Hg Rain
P-1 !V 11:43 AM !V 64.0 64.0 3.2 19.1 1.5
P-2 !V 13:25 PM !V 0.0 0.0 0.0 20.9 0.7
P-3 !V 13:36 PM !V 356 356 17.8 3.9 11.7
P-4 !V 13:41 PM !V 2.0 2.0 0.1 18.9 3.4
P-5 !V 13:44 PM !V 0.0 0.0 0.0 19.1 2.3
P-6 !V 12:33 PM !V 2.0 2.0 0.1 21.3 0.3
P-7 !V 11:56 AM !V 72.0 72.0 3.6 0.0 18.1
P-8 !V 11:36 PM !V 0.0 0.0 0.0 15.5 4.6
P-9 !V 12:53 PM !V 0.0 0.0 0.0 19.9 0.8
P-10 !V 13:20 PM !V 0.0 0.0 0.0 6.0 12.5
P-11 >60s 13:11 PM >60s 0.0 0.0 0.0 16.4 2.7
P-12 >60s 12:02 PM >60s 0.0 0.0 0.0 21.1 0.5
P-13 >60s
Project Manager
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: ______________________________________________ Permit Number: ____________________________
Date of Sampling: ___________________ NC Landfill Rule (.0500 or .1600): _____________________________________
Name and Position of Sample Collector: _________________________________________
Type and Serial Number of Gas Meter: _______________________________ Calibration Date of Gas Meter: ___________
Date and Time of Field Calibration: _____________________
Type of Field Calibration Gas (15/15 or 35/50): ____________ Expiration Date of Field Calibration Gas Canister: ________
Pump Rate of Gas Meter: _____________
Ambient Air Temperature: __________ Barometric Pressure: ______________ General Weather Conditions: _____________
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
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.
__________________________________ ________________________
SIGNATURE TITLE
.0500
Avery County Closed Landfill 06-01
11/7/17 .0500
Frank Terry S+G
Envision ENV100 1510204 12/2016
11/6/17 15:46 PM
15/15 10/2018
0.5 L/min
62 30.06 Rain
Avery County Airport Structure #1
NE Corner >60s 1400 >60s 0 0 0 20.9 0
NW Corner >60s 1403 >60s 0 0 0 20.9 0
SE Corner >60s 1406 >60s 0 0 0 20.9 0
SW Corner >60s 1409 >60s 0 0 0 20.9 0
Avery County Airport Structure #2
NE Corner >60s 1412 >60s 0 0 0 20.9 0
NW Corner >60s 1415 >60s 0 0 0 20.9 0
SE Corner >60s 1418 >60s 0 0 0 20.9 0
SW Corner >60s 1421 >60s 0 0 0 20.9 0
Avery County Airport Structure #3
NE Corner >60s 1424 >60s 0 0 0 20.9 0
NW Corner >60s 1428 >60s 0 0 0 20.9 0
SE Corner >60s 1431 >60s 0 0 0 20.9 0
SW Corner >60s 1433 >60s 0 0 0 20.9 0
Avery County Airport Structure #4
NE Corner >60s 1436 >60s 0 0 0 20.9 0
NW Corner >60s 1439 >60s 0 0 0 20.9 0
SE Corner >60s 1442 >60s 0 0 0 20.9 0
SW Corner >60s 1445 >60s 0 0 0 20.9 0
Avery County Airport Structure #5
NE Corner >60s 1448 >60s 0 0 0 20.9 0
NW Corner >60s 1451 >60s 0 0 0 20.9 0
SE Corner >60s 1454 >60s 0 0 0 20.9 0
SW Corner >60s 1457 >60s 0 0 0 20.9 0
Project Manager, S+G
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: ______________________________________________ Permit Number: ____________________________
Date of Sampling: ___________________ NC Landfill Rule (.0500 or .1600): _____________________________________
Name and Position of Sample Collector: _________________________________________
Type and Serial Number of Gas Meter: _______________________________ Calibration Date of Gas Meter: ___________
Date and Time of Field Calibration: _____________________
Type of Field Calibration Gas (15/15 or 35/50): ____________ Expiration Date of Field Calibration Gas Canister: ________
Pump Rate of Gas Meter: _____________
Ambient Air Temperature: __________ Barometric Pressure: ______________ General Weather Conditions: _____________
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
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.
__________________________________ ________________________
SIGNATURE TITLE
.0500
Avery County Closed Landfill 06-01
11/7/17 .0500
Frank Terry S+G
Envision ENV100 1510204 12/2016
11/6/17 15:46 PM
15/15 10/2018
0.5 L/min
62 30.06 Rain
Project Manager, S+G
Avery County Airport Structure #6
NE Corner >60s 1500 >60s 0 0 0 20.9 0
NW Corner >60s 1503 >60s 0 0 0 20.9 0
SE Corner >60s 1506 >60s 0 0020.9 0
SW Corner >60s 1509 >60s 0 0 0 20.9 0

Attachment 2

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By:FAT
Date:11/10/2017
Avery County MSW Landfill
Landfill Gas Monitoring Well Network
Methane Concentrations Between May 2011 and November 2017
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
Nov-11Dec-11Jan-12Feb-12Mar-12Apr-12May-12Jun-12Jul-12Aug-12Sep-12Oct-12Nov-12Dec-12Jan-13Feb-13Mar-13Apr-13May-13Jun-13Jul-13Aug-13Sep-13Oct-13Nov-13Dec-13Jan-14Feb-14Mar-14Apr-14May-14Jun-14Jul-14Aug-14Sep-14Oct-14Nov-14Dec-14Jan-15Feb-15Mar-15Apr-15May-15Jun-15Jul-15Aug-15Sep-15Oct-15Nov-15Dec-15Jan-16Feb-16Mar-16Apr-16May-16Jun-16Jul-16Aug-16Sep-16Oct-16Nov-16Dec-16Jan-17Feb-17Mar-17Apr-17May-17Jun-17Jul-17Aug-17Sep-17Oct-17Nov-17Dec-17P1
P3
P7
P11
P12
P13
Well
% CH4 by
Volume
Installation of W9 and W10
(April 30, 2013) Installation of W9/P3
Connection
(September 11, 2014
Installation of P7/W8 and P1/W10 Connection (September 3, 2015)
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FIGURE

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0200'400'1234564G:\CAD\Avery County\Avery 13-6\sheets\AVERY-B0216.dwg - 12/3/2013 11:03 AM
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