4903_IredellCoMSWLF_Nov2024LFGExccedanceProgressRpt_FID1996719_20250331

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Statesville, NC, 28677
P.704.283.9765 F. 704.283.9755www.integrityenvsol.com
February 19, 2025
Ervin Lane Solid Waste Section
NCDEQ - Division of Waste Management
Raleigh Regional Office
1646 Mail Service Center
Raleigh, NC 27699-1646
Subject: Q1 2024 Methane Migration Monitoring Exceedances – Remediation Plan Monthly Progress Update – November 2024
Iredell County Subtitle D Lined Landfills/Closed Unlined C&D Landfill
Statesville, North Carolina
Solid Waste Permit No. 49-03
Dear Ervin:
On behalf of Iredell County (County), Integrity Environmental Solutions, LLC (Integrity) is submitting to
the North Carolina Department of Environmental Quality (NCDEQ) Division of Waste Management Solid
Waste Section (SWS) the subject remediation plan progress updates for a recent methane migration
monitoring exceedance detected at the Subtitle D Lined Landfills/Closed Unlined C&D Landfill facility that
is owned and operated by the County.
As previously reported to NCDEQ in a notification letter dated March 18, 2024 and the subsequent remediation plan dated May 14, 2024, there was one (1) perimeter gas probe location with methane
detections above the 5% lower explosive limit (LEL) during the first quarter 2024 monitoring event: MP-
6A (53.1%).
Pursuant to NCAC 13B .1626(4)(c)(iii), the County has commenced implementation of the remediation
plan for explosive gas release at this location. In accordance with NCAC 13B .1626(4)(c)(iii), the plan
describes the nature and extent of the exceedance and proposed remedies. The below remediation plan
progress updates are being provided to NCDEQ for the month of January 2024:
•MP-6A was monitored weekly in January.
o Methane concentrations were first read below 5% at MP-6A as of May 16, 2024. However,
MP-6A was read above 5% again as of May 28, 2024 and remained above the 5%threshold until June 20, 2024.
o MP-6A was read below 5% June 25, 2024, and remained below the 5% threshold until
July 29, 2024
o MP-6A was then read above 5% as of August 7, 2024 remained above the 5% threshold
throughout October.
o MP-6A fluctuated above and below 5% several times during the course of November.
o MP-6A was read below 5% as of November 26, 2024 and has remained below the 5%
through January 7, 2025.
o MP-6A was then read above 5% as over January 13, 2025 and remained above the 5%
threshold through the end of January.
o As stated in the remediation plan submitted to NCDEQ MP-6A must remain below the 5%
LEL for a consecutive two (2) months.
Mr. Ervin Lane February 19, 2025
Page 2 of 2
•Barhole punch and sampling occurred at four (4) locations between MP-6A and the northwestern
landfill perimeter on May 23, June 18, July 17, August 21, September 20, October 24, November26, December 19, 2024, and January 16, 2025. Methane was not detected above 5% at any
barhole punch location. Monthly barhole punch and sampling at these locations will continue in
January.
•Weekly monitoring at the ICATS office structure was completed, and methane was not detected
above 1.25% during any monitoring period. Because methane continued to be above 5% at MP-
6A, weekly monitoring of the ICATS office structure will continue in February 2025.
•During the month of July, the County began the project of extending the toe drain located along
the Northwestern side of Phase 4. The project continued through the month of August, upon
completion, it will be connected on both ends to the active LFG collection system. As of the end
of October, the toe drain lid has been completed and both ends have been connected to the LFGcollection system. This project is now considered to be complete.
•Flare upgrades in order to assist with stabilizing system vacuum throughout the wellfield were
temporarily delayed due to a parts delay.
If you have any questions regarding this remediation plan, or require additional information, please
contact the undersigned at [phone].
Sincerely,
Kathryn Fauerby
Project Manager
Integrity Environmental Solutions
Permit ID Device ID Date and
Time of Day
Initial
% LEL
Stabilized
% LEL
% CH4
(volume)
% O2
(volume)
% CO2
(volume)
MP-6A IRDLMP6A 3/15/2024 13:32 >100 >100 53.10 0.00 38.10
MP-6A IRDLMP6A 3/22/2024 10:13 >100 >100 52.10 1.80 34.80
MP-6A IRDLMP6A 3/28/2024 10:54 >100 >100 57.60 0.00 38.30
MP-6A IRDLMP6A 4/5/2024 07:56 >100 >100 46.40 1.60 34.50
MP-6A IRDLMP6A 4/11/2024 14:12 >100 >100 61.80 0.10 37.80
MP-6A IRDLMP6A 4/18/2024 10:31 >100 >100 57.80 0.60 38.80
MP-6A IRDLMP6A 4/25/2024 09:59 >100 >100 43.70 1.90 36.10
MP-6A IRDLMP6A 5/2/2024 09:13 >100 >100 30.00 2.70 33.20
MP-6A IRDLMP6A 5/8/2024 13:18 >100 >100 8.00 10.40 16.40
MP-6A IRDLMP6A 5/16/2024 08:12 48.00 48.00 2.40 15.40 8.20
MP-6A IRDLMP6A 5/24/2024 07:53 14.00 14.00 0.70 15.60 6.40
MP-6A IRDLMP6A 5/28/2024 13:15 >100 >100 8.70 6.50 20.80
MP-6A IRDLMP6A 6/7/2024 12:43 >100 >100 25.00 2.80 31.10
MP-6A IRDLMP6A 6/11/2024 12:12 >100 >100 25.50 1.10 34.50
MP-6A IRDLMP6A 6/20/2024 09:56 30.00 30.00 1.50 5.30 22.60
MP-6A IRDLMP6A 6/25/2024 08:03 0.00 0.00 0.00 8.30 17.10
MP-6A IRDLMP6A 7/3/2024 13:02 2.00 2.00 0.10 15.80 10.30
MP-6A IRDLMP6A 7/11/2024 13:27 0.00 0.00 0.00 15.80 9.90
MP-6A IRDLMP6A 7/19/2024 15:14 0.00 0.00 0.00 19.70 3.80
MP-6A IRDLMP6A 7/25/2024 15:07 0.00 0.00 0.00 21.20 2.30
MP-6A IRDLMP6A 7/29/2024 14:15 0.00 0.00 0.00 20.60 1.70
MP-6A IRDLMP6A 8/7/2024 08:27 >100 >100 25.90 3.40 19.40
MP-6A IRDLMP6A 8/12/2024 09:36 >100 >100 37.00 2.90 24.10
MP-6A IRDLMP6A 8/20/2024 14:08 >100 >100 44.30 3.00 29.00
MP-6A IRDLMP6A 8/22/2024 13:52 >100 >100 45.70 2.90 30.70
MP-6A IRDLMP6A 8/30/2024 08:59 >100 >100 37.60 3.80 29.30
MP-6A IRDLMP6A 9/3/2024 08:18 >100 >100 44.70 1.80 34.30
MP-6A IRDLMP6A 9/9/2024 09:14 >100 >100 46.80 0.70 35.20
MP-6A IRDLMP6A 9/16/2024 10:17 >100 >100 35.90 1.20 33.20
MP-6A IRDLMP6A 9/23/2024 11:00 >100 >100 43.80 0.30 34.60
MP-6A IRDLMP6A 10/1/2024 12:45 >100 >100 56.00 0.30 36.70
MP-6A IRDLMP6A 10/8/2024 11:14 >100 >100 59.60 0.60 36.20
Methane Monitoring Data Summary
March 2024 - January 2025
Iredell County Subtitle D Lined Landfills/Closed Unlined C&D Landfill (Permit No. 49-03)
Permit ID Device ID Date and
Time of Day
Initial
% LEL
Stabilized
% LEL
% CH4
(volume)
% O2
(volume)
% CO2
(volume)
Methane Monitoring Data Summary
March 2024 - January 2025
Iredell County Subtitle D Lined Landfills/Closed Unlined C&D Landfill (Permit No. 49-03)
MP-6A IRDLMP6A 10/18/2024 08:14 >100 >100 45.40 2.40 30.20
MP-6A IRDLMP6A 10/21/2024 08:44 >100 >100 33.20 2.40 28.20
MP-6A IRDLMP6A 10/28/2024 09:31 >100 >100 9.00 2.00 24.00
MP-6A IRDLMP6A 11/4/2024 15:27 56.00 56.00 2.80 1.70 23.20
MP-6A IRDLMP6A 11/12/2024 09:47 86.00 86.00 4.30 1.70 22.90
MP-6A IRDLMP6A 11/18/2024 08:07 >100 >100 5.50 1.40 22.10
MP-6A IRDLMP6A 11/21/2024 14:22 >100 >100 7.80 0.20 23.00
MP-6A IRDLMP6A 11/26/2024 15:11 66.00 66.00 3.30 0.30 21.70
MP-6A IRDLMP6A 12/2/2024 08:51 4.00 4.00 0.20 0.10 20.00
MP-6A IRDLMP6A 12/9/2024 09:55 2.00 2.00 0.10 1.50 16.50
MP-6A IRDLMP6A 12/16/2024 09:16 2.00 2.00 0.10 3.50 13.50
MP-6A IRDLMP6A 12/23/2024 13:58 14.00 14.00 0.70 2.90 15.00
MP-6A IRDLMP6A 12/30/2024 08:04 16.00 16.00 0.80 1.20 16.40
MP-6A IRDLMP6A 1/7/2025 08:44 8.00 8.00 0.40 4.30 13.80
MP-6A IRDLMP6A 1/13/2025 11:02 >100 >100 6.50 2.00 15.80
MP-6A IRDLMP6A 1/20/2025 15:18 >100 >100 14.60 4.30 14.40
MP-6A IRDLMP6A 1/28/2025 09:04 >100 >100 12.20 2.20 16.20
GEM 5000 gas analyzers were used for all monitoring events and were calibrated appropriately prior to monitoring.