0601_AveryCoMSW_LFGM_DIN28584_20170728

July 28, 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 –July 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 July 26,
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 July 26, 2017. Initial
measurements indicated there was approximately 29 inches of available vacuum at the
vacuum blower inlet, ranging from approximately 27 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
July 28, 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 at an acceptable level during this
site visit. S+G will continue to monitor the liquid level of the condensate tank.

 Filter Tank: The filter tank was at an acceptable level 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 10%
measured at the flare no active combustion was observed. The spark ignition
system was operational; however, flame ignition continues to be unsuccessful.
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 Wells P-1, P-3, P-7, and P-13 exhibited CH4 concentration readings of 1.0%, 1.6%,
1.9%, and 0.8% respectively which do not exceed the LEL of 5%. 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.

CONCLUSIONS

The site has been generally characterized by a trend of consistently decreasing LFG
concentrations and flow rate. Methane concentrations have decreased slightly from the May
2017 monitoring event in several probes during this monitoring event. We will continue to
monitor the CH4 concentrations at the site monthly.

Ms. Drummond
July 28, 2017
Page 3 of 3
The next routine monitoring event is scheduled for August 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\7 July 2017\Avery Co MSW LFG Monitoring Rpt July 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 7/26/2017 9:26 67.6 27.3 0.5 4.6 72 -26.1 -26.1 0.0 0.0 0.0 -26.1
AVERY-W2 7/26/2017 9:15 50.6 27.0 0.6 21.8 69 -26.4 -26.4 0.0 0.0 11.9 -26.6
AVERY-W3 7/26/2017 9:04 62.2 28.4 1.3 8.1 72 -26.4 -26.4 0.0 0.0 0.0 -26.7
AVERY-W4 7/26/2017 9:18 48.5 24.3 0.6 26.6 71 -26.4 -26.4 0.0 0.0 0.0 -26.8
AVERY-W5 7/26/2017 9:46 31.4 25.0 0.3 43.3 69 -25.9 -25.9 0.4 2.0 2.0 -26.7
AVERY-W6 7/26/2017 9:44 11.9 19.4 2.0 66.7 72 -6.9 -6.9 0.0 0.0 0.0 -26.8
AVERY-W7 7/26/2017 9:40 7.0 17.2 4.4 71.4 74 -3.1 -3.1 3.9 1.6 1.6 -26.8
AVERY-W8 7/26/2017 9:50 20.3 22.8 1.5 55.4 71 -26.4 -26.4 0.0 0.0 0.0 -26.5
Avery-W9 7/26/2017 9:33 22.6 24.9 3.1 49.4 72 -26.1 -26.1 0.1 0.3 0.3 -26.4
AveryW10 7/26/2017 9:07 49.6 27.5 3.2 19.7 70 -26.4 -26.4 0.0 0.1 0.2 -26.4
Av-Flare 7/26/2017 10:00 10.1 7.6 14.3 68.0 NR 2.2 2.6 2.7 32.0 32.0 0.2
Av-Flare 7/26/2017 10:02 10.3 7.6 14.3 67.8 NR -29.1 -29.4 29.4 NR NR 0.3
NR= not recorded
Landfill Gas Collection and Control System Monitoring
July 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.
July 28, 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

Attachment 2

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By:FAT
Date:7/28/2017
Avery County MSW Landfill
Landfill Gas Monitoring Well Network
Methane Concentrations Between May 2011 and July 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-17P1
P3
P7
P11
P12
P13
Well
% CH4 by
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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