7904_RockinghamMSWLF_ March2024LFGMR_FID1838309_20240516

April 19, 2024

Mr. Ervin Lane
Compliance Hydrogeologist
NCDEQ/Solid Waste Section
1646 Mail Service Center
Raleigh, NC 27699-1646

RE: March 2024 First Quarter Landfill Gas (Methane) Migration Monitoring Report and
Exceedance Notification
Rockingham County Solid Waste Management Facility, Permit Nos. 79-01 & 79-04
Project No. 2233671, Phase No. 03

Dear Ervin:
On behalf of Rockingham County and Wall Recycling, LaBella Associates (LaBella) is submitting the
attached methane monitoring results for the Rockingham County Solid Waste Management facility,
Permits 79-01 (Landfill 79-01) and 79-04 (Landfill 79-04).
The 2024 First Quarter Landfill Gas Monitoring event was performed on March 28, 2024. The
monitoring program for the Rockingham County Solid Waste Management Facility includes a total of
20 permanent gas monitoring probes and seven structures. The approximate locations of the probes
and the structures are depicted in Drawing No.1, LFG Monitoring Network.
The results of the 2024 First Quarter Monitoring Event are summarized in the attached Landfill Gas
Monitoring Data Forms. According to the monitoring readings, methane concentrations were detected
above the instrument detection level, or 0.0 Percent Volume, in boundary probes 7901-M-5 (38.7%),
7901-M-6 (1.4%), 7901-M-8A (0.6%), and 7901-M-12 (49.8%).
Methane was detected at concentrations above the regulatory limit of 100% of the Lower Explosive
Limit (LEL), or 5 percent volume in boundary probes 7901-M-5 and 7901-M-12. The methane
detections and the exceedances of the LEL are summarized in the attached Tables 1 and 2,
respectively.
The exceedances of the regulatory limit in boundary probes 7901-M-5 and 7901-M-12 are consistent
with historical data (see attached Table 3). Based on the continued regulatory exceedances in these
probes, LaBella, on behalf of Rockingham County, submitted a Landfill Gas Remediation Activity
Update and Remediation Plan dated March 11, 2024, to address the methane exceedances in
boundary probes 7901-M-5 and 7901-M-12. The Plan was approved by the NCDEQ SWS on March 20,
2024. It is anticipated that the vents will be installed and connected to the existing extraction system
for the utility flare (CD-3) during the 2nd quarter of 2024.

2
Please feel free to contact me at [phone] with any questions regarding this submittal.
Respectfully submitted,
LaBella Associates

Kandice Estes
Project Geologist

Attachments: NC Environmental Monitoring Reporting Form
Tables 1, 2, and 3
Landfill Gas Monitoring Data Forms
Drawing No.1

Cc: Ronnie Tate, Rockingham County
Charlie Jarboe, Wall Recycling

Summary of Detections Exceedances
Permits 79-01 and 79-04
March 28, 2024
Date Location CH4 (% LEL)CH4 (% Volume)
3/28/2024 7901-M-5 774 38.7
3/28/2024 7901-M-6 28 1.4
3/28/2024 7901-M-8A 12 0.6
3/28/2024 7901-M-12 996 49.8
Date Location CH4 (% LEL)CH4 (% Volume)
3/28/2024 7901-M-5 774 38.7
3/28/2024 7901-M-12 996 49.8
CH4 = Methane
LEL = Lower Explosive Limit for Methane
LEL = 5% by volume at standard temperature and pressure
BOLD = Methane concentration above LEL
Date Location CH4 (% LEL)CH4 (% Volume)
3/18/2019 7901-M-5 0 0
7/1/2019 7901-M-5 0 0.0
9/30/2019 7901-M-5 1204 60.2
12/10/2019 7901-M-5 1152 57.6
1/27/2020 7901-M-5 1178 58.9
4/6/2020 7901-M-5 0 0
6/23/2020 7901-M-5 418 20.9
12/29/2020 7901-M-5 0 0
1/26/2021 7901-M-5 364 18.2
4/6/2021 7901-M-5 0 0
7/13/2021 7901-M-5 800 40
1/19/2022 7901-M-5 480 24
4/28/2022 7901-M-5 1004 50.2
7/20/2022 7901-M-5 NM NM
1/27/2023 7901-M-5 954 47.7
2/16/2023 7901-M-5 692 34.6
3/1/2023 7901-M-5 936 46.8
3/7/2023 7901-M-5 724 36.2
3/8/2023 7901-M-5 706 35.3
3/20/2023 7901-M-5 900 45
3/29/2032 7901-M-5 586 29.3
6/27/2023 7901-M-5 626 31.3
9/5/2023 7901-M-5 840 42
11/30/2023 7901-M-5 618 30.9
3/28/2024 7901-M-5 774 38.7
3/18/2019 7901-M-12 676 33.8
4/8/2019 7901-M-12 1194 59.7
5/18/2019 7901-M-12 614 30.7
6/7/2019 7901-M-12 1114 55.7
7/1/2019 7901-M-12 1028 51.4
8/13/2019 7901-M-12 1152 57.6
9/30/2019 7901-M-12 1156 57.8
11/12/2019 7901-M-12 984 49.2
12/10/2019 7901-M-12 1122 56.1
1/27/2020 7901-M-12 1160 58
4/6/2020 7901-M-12 1140 57
6/22/2020 7901-M-12 1162 58.1
12/29/2020 7901-M-12 1190 59.5
1/26/2021 7901-M-12 468 23.4
4/6/2021 7901-M-12 1146 57.3
7/13/2021 7901-M-12 628 31.4
4/28/2022 7901-M-12 788 39.4
7/20/2022 7901-M-12 NM NM
1/27/2023 7901-M-12 16 0.8
2/16/2023 7901-M-12 1152 57.6
3/1/2023 7901-M-12 1152 57.6
3/7/2023 7901-M-12 1152 57.6
3/8/2023 7901-M-12 1152 57.6
3/20/2023 7901-M-12 646 32.3
3/29/2023 7901-M-12 36 1.8
6/27/2023 7901-M-12 954 47.7
9/5/2023 7901-M-12 1010 50.5
11/30/2023 7901-M-12 802 40.1
3/28/2024 7901-M-12 996 49.8
TABLE 1: Methane Detections at Boundary Probes
TABLE 2: Exceedances of the LEL
TABLE 3: Historical Data
7901-M-12 Historical Data
7901-M-5 Historical Data
Rockingham County Landfill
Permits # 79-01, 79-04 1 of 1
Labella Associates
March 2024
ACTIVE
PHASE 3
(9.5 AC)
EXISTING
PHASE 2
(9.0 AC)
EXISTING
PHASE 1
(19.0 AC)
MAINTENANCE BUILDING /
OFFICE
EXISTING
SED BASIN NO.1
EXISTING
LEACHATE LAGOON
PROPERTY LINE
EXISTING
SED BASIN NO.2
LMP-1 GV-36AGV-37 GV-36
GV-37A
GV-31
GV-31A
GV-2
GV-1
GV-10
CONVENIENCE CENTERSCALE HOUSE
WHITE GOODS
(APPROVED BY DEQ)
OLD SHOP
M-4M-5
M-2
M-1
M-10
M-9
M-8
M-6
GV5-4
GV3-8
GV3-9
GV3-3
GV3-1
GV3-7
GV3-6
GV5-2
GV5-1
M-7
GV-1
GV-2
GV-3
M-9A
M-7A
M-8A
M-10A
GV-4
GV-5
GV-6
GV-8
GV-7
CLOSED
AREA III
(PERMIT 7901)
CLOSED
AREA IV
(PERMIT 7901)
CLOSED
AREAS I - II
(PERMIT 7901)
SMP-2
CONCRETE AND
BRICK STORAGE
APPROXIMATE
LIMITS OF
TEMPORARY
MULCH
STORAGE TIRES
APPROXIMATE
LIMITS OF
ROLL OFF
CONTAINER
STORAGE AREA
APPROXIMATE
LIMITS OF
ELECTRONICS
RECYCLING
STORAGE AREA
APPROXIMATE LIMITS
OF WASTE (TYP)
M-3
GV5-3
PHASE 1-3
PERMIT 7904
GV3-4
GV3-2
EXISTING GAS SYSTEM (TYP)
GW-43
GW-38
GW-40
GW-41
GW-44
GW-45
GW-46
GW-47
GW-49
GW-48
GW-50
GW-51
GW-52
GW-53
GW-63
PHASE 4
(11.0 AC)
EXISTING
SEDIMENT
BASIN NO. 5
EXISTING
SED BASIN NO.3
EXISTING
SED BASIN NO.4
PHASE 5
(10.7 AC.)
PHASE 6
(7.7 AC)
PHASE 7
(13.7 AC)
LEGEND
EXISTING GAS PROBE LOCATION AND IDENTIFICATION
PROPOSED GAS PROBE LOCATION AND IDENTIFICATION
EXISTING GAS VENT LOCATION AND IDENTIFICATIONGV-#
M-#
SUB D M-1
SUB D M-2
SUB D M-7
SUB D M-5
SUB D M-4
SUB D M-3
SUB D M-2A
SUB D M-8
SUB D M-9
STORM
SHELTER
HAY BARN
M-11
M-12
GV3-16
GV3-15
GV3-17
GV3-14
GV3-13
GV3-12
GV2-9
GV2-8 GV2-7
GV2-6
GV4-4GV4-1
GV4-2
GV4-3
GV3-5
GW-55
GW-57
GW-60
GW-58
GW-56GW-54
GW-60
GW-62
GW-61
GW-#EXISTING GAS WELL LOCATION AND IDENTIFICATION
66
0
68
0
720
740
70
0
720
800
780
750
690
690
670
650
630
59
0
61
0
63
0
640
620
60
0
760
74
0
72
0
750
730
710
690
650
650
670
690
710
65
067
0
690
690680
660
68
0
69
0
71
0
66
0
64
0
62
0
72
0
70
068
0
68
0
66
0
670
650
630
620
650680
670
65
0
590
610
630
660630610
740
760
750
750
740
74
0
68
0
650
630
SUB D-M10
SUBD-M11
SUBD-M12
SUBD-M13
M-#
GV3-10
GV3-11
APPROXIMATE LIMITS OF WOOD
WASTE STORAGE AREA
(APPROVED BY DEQ IN A LETTER
DATED MARCH 4, 1996)
CLOSED
AREA V
(PERMIT 7901)
0
(FEET)
GRAPHIC SCALE
600300150
Revisions
NO:DATE:DESCRIPTION:
DRAWING NAME:
6/
3
/
2
0
1
0

8
:
4
7
:
5
6

A
M
DRAWING NUMBER:
DATE:
ISSUED FOR:
DRAWN BY:
REVIEWED BY:
PROJECT NUMBER:
© 2023 LaBella Associates
12-D OAK BRANCH DRIVE
GREENSBORO, NC.
[phone]
labellapc.com
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1
LANDFILL GAS
MONITORING PLAN
ROCKINGHAM COUNTY
WENTWORTH, NORTH CAROLINA
ROCKINGHAM COUNTY LANDFILL
MADISON, NORTH CAROLINA
2233671
PERMITTING
12/13/23