1304_Cabarrus_CharlotteMotorSpeedwayV_MSWLF_SoilGasAssessment_FID1294929_20190402

Soil Gas Extraction Wells and Migration
Assessment Report
Charlotte Motor Speedway Landfill V
5105 Morehead Road
Concord, NC 28027
704-782-2004
02201314.73 1 March 11, 2019
2520 Whitehall Park Drive, Suite 450
Charlotte, NC 28273
704-504-3107

Table of Contents
Section Page
1.0
INTRODUCTION...................................................................................................................................1
Objective.............................................................................................................................................1
2.0
SITE BACKGROUND............................................................................................................................1
Overview.............................................................................................................................................1
Landfill Gas Collection and Control System.....................................................................................1
Groundwater Monitoring Network.....................................................................................................1
3.0
SOIL GAS EXTRACTION WELLS..........................................................................................................2
WellConstruction...............................................................................................................................2
Gas Monitoring Data - Passive..........................................................................................................3
GasMonitoring Data -Active.............................................................................................................3
4.0
CONCLUSIONS and RECOMMENDATIONS........................................................................................4
Appendices
A Figures and Drawings
B Soil Gas Probe Boring Logs
M:\PROJECT FILES\02201314.73\Deliverables\Soil Gas Well_GW Study V06.docx
Soil Gas Extraction Wells and Migration Assessment www.scsenciineers.com
Page

1.0 INTRODUCTION
This report, prepared by SCS Engineers, PC (SCS), summarizes a limited investigation of the
subsurface conditions present in a distinct area at the Charlotte Motor Speedway Landfill V (Landfill
or Site). The investigation included the installation of four (4) soil gas extraction wells and an initial
assessment of subsurface gas from those wells at the Site. The Site is located at 5105 Morehead
Road in Concord, North Carolina, and is owned and operated by BFI Waste Systems of America
(Figure 1, Appendix A). The Site operates under Solid Waste Permit #13-04.
OBJECTIVE
Over the past few years, elevated concentrations of volatile organic compounds (VOCs) has been
detected in groundwater wells located west of Phases 2E through 2H. The groundwater wells in this
area (referred to herein as the Area of Concern "AOC") are illustrated on Figure 2, Appendix A. One
potential cause for the elevated concentrations of VOCs may be landfill gas (LFG) in the subsurface.
The objective of the subsurface investigation was to establish if LFG is present in the subsurface in
the AOC.
2.0 SITE BACKGROUND
OVERVIEW
The Landfill currently accepts municipal solid waste (MSW), construction and demolition (C&D)
material, and industrial waste. The Landfill's disposal area covers approximately 260 acres and
includes cells 1A, 1B, 2A-21, and 2L-vertical expansion. All cells are lined with a leachate collection
system in accordance with Subtitle D solid waste rules.
LANDFILL GAS COLLECTION AND CONTROL SYSTEM
The landfill gas collection and control system (GCCS) at the Landfill consists of the following:
• Over 220 vertical extraction wells.
• Over 30 leachate cleanouts.
• Blower skid with three Lamson 4,000 scfm blowers equipped with 150 Hp motors.
• An enclosed flare (6,000 scfm).
• A utility flare (3,000 scfm).
In addition, the Site has two landfill gas to energy (LGTE) facilities that includes three turbines that
consume LFG and produce electricity. The majority of the collected LFG goes to the LGTE plants and
the excess LFG is flared.
GROUNDWATER MONITORING NETWORK
The groundwater monitoring well network at the Landfill includes 33 groundwater monitoring wells.
These wells are sampled and a report generated on a semi-annual basis in accordance the Landfill's
permit and NCDEQ requirements.
The groundwater wells in the AOC include MW-17, MW-17A, MW-32R, MW-33, and MW-34.
Soil Gas Extraction Wells and Migration Assessment
Page 1

3.0 SOIL GAS EXTRACTION WELLS
WELL CONSTRUCTION
In the southwest corner of the site outside the waste disposal area, four soil probes were drilled to
assess the presence of LFG. The location of the probes is depicted on Figure 2, Appendix A. Drilling
was performed by SCS's subcontracted driller, A.E. Drilling Services.
The drilling began on June 18th and completed June 19th. Boreholes were advanced using a
Geoprobe 8040 dt with 4.25 inch hollow stem augers. The boreholes were constructed with 2-inch
Schedule 40 PVC well screen and well casing with a sand filter pack and bentonite seal. A detail of
the soil probe is illustrated on Figure 3, Appendix A. Table 1 summarizes the probe construction and
probe completion logs are provided in Appendix B.
Table 1. Probe Construction Data
Probe
Screen
Length ft
Probe
Depth ft
P-01
10
12.5
P-02
26.5
29
P-03
11.2
13.7
P-04
25
27.5
Soil Gas Extraction Wells and Migration Assessment
Page 2

GAS MONITORING DATA - PASSIVE
Following installation of the probes, SCS Engineers and Blue Flame (the landfill's OM&M firm)
monitored the probes. Results of the passive monitoring are summarized below in Table 2.
Table 2. Probe Monitoring Data - Passive
Well ID
Date
CH4 %
CO2 %
02 %
SCS Engineers
P1
6/27/2018
59.4
37.7
2.8
SCS Engineers
P2
6/27/2018
58.6
41.1
0.0
SCS Engineers
P3
6/27/2018
37.7
30.6
3.9
SCS Engineers
P4
6/27/2018
58.4
36.4
5.2
Blue Flame
P1
6/29/2018
22
15.7
13
Blue Flame
P2
6/29/2018
41.7
32
3.9
Blue Flame
P3
6/29/2018
14.2
16.1
10.7
Blue Flame
P4
6/29/2018
23.2
20.5
10.2
Blue Flame
P1
7/6/2018
51.1
36.5
1.8
Blue Flame
P2
7/6/2018
57.1
39.5
0.0
Blue Flame
P3
7/6/2018
35.6
33.1
3.4
Blue Flame
P4
7/6/2018
52.7
38
1.1
SCS Engineers
P1
7/10/2018
57.7
42.1
0.1
SCS Engineers
P2
7/10/2018
58.3
41.6
0.0
SCS Engineers
P3
7/10/2018
37.8
32.4
4.6
SCS Engineers
P4
7/10/2018
56.9
43.1
0.10
Blue Flame
P1
7/12/2018
0
0
21.2
Blue Flame
P2
7/12/2018
0.1
0
21.3
Blue Flame
P3
7/12/2018
7.9
5.4
17.2
Blue Flame
P4
7/12/2018
0
0
21.2
SCS Engineers
P1
7/19/2018
7.6
4.6
18.4
SCS Engineers
P2
7/19/2018
9.4
8.6
14.8
SCS Engineers
P3
7/19/2018
7.6
14.1
8.6
SCS Engineers
P4
7/19/2018
21.2
22.8
5.6
GAS MONITORING DATA - ACTIVE
In October, the four probes were connected to the active landfill gas collection and control system
(GCCS) by B&M Excavating. To connect the probes, a 4-inch diameter HDPE LFG lateral pipe was
installed from the probe to an active LFG header or riser pipe. A LFG wellhead with a valve and
sample ports was also attached that is used to regulate vacuum. A Site Plan is provided that
illustrates the as -constructed piping.
Following the connection of the probes to the GCCS, a vacuum was applied to the probes.
Monitoring data is provided below:
Soil Gas Extraction Wells and Migration Assessment
Page 3

Table 3. Probe Monitoring Data - Active
Well ID
Date
CHa %
CO2 %
Oz %
Balance %
Adjust Static
Pressure
GP-01
11-8-18
35.7
28.7
4.7
30.9
-46.62
G P-01
1 1-14-18
43.3
31.7
3.0
22.0
-53.08
GP-01
11-28-18
30.9
28
4.5
36.6
-56.76
GP-01
12-31-18
15.7
10.1
15.3
58.9
-52.15
GP-01
2-20-19
12
6.2
17.4
64.4
-46.76
GP-02
11-8-18
10.7
6.8
17.4
65.1
-10.18
GP-02
11-14-18
4.3
2.0
19.3
74.4
-16.98
GP-02
11-28-18
9.5
5.9
17.7
66.9
-7.43
GP-02
12-31-18
6.4
3.4
18.3
71.9
-17.36
GP-02
2-20-19
16.3
13.1
12.7
57.9
-12.46
GP-03
11-8-18
49.8
32.0
3.6
14.6
-10.18
GP-03
1 1-14-18
22.0
15.4
12.9
49.7
-6.93
GP-03
11-28-18
14.8
9.9
15.3
60
-6.42
GP-03
12-31-18
1.2
0.3
20.6
77.9
-46.75
GP-03
2-20-19
0.3
0.1
20.8
78.8
-9.76
GP-04
11-8-18
34.5
27.6
6.4
31.5
-59.21
GP-04
1 1-14-18
42.4
32.7
2.6
22.3
-60.9
GP-04
11-28-18
25.2
20.7
10.1
44
-61.4
GP-04
12-31-18
39.7
25.6
8.5
26.2
-61.95
GP-04
2-20-19
9.5
6.2
17.3
67
-58.25
4.0 CONCLUSIONS AND RECOMMENDATIONS
Based on the results presented above, it is our opinion LFG has migrated from the active landfill and
is present in the subsurface in the AOC.
We offer the following recommendations:
1. Continue to actively extract gas from these four probes and monitor on a monthly basis.
2. Investigate potential causes of LFG migration from the Landfill.
3. Based on monitoring results additional soil gas extraction wells may be installed in the
area.
4. Maximize the removal of landfill gas from the existing extraction wells in the area.
5. Evaluate additional methods for landfill gas extraction within the waste mass in the area.
Soil Gas Extraction Wells and Migration Assessment
Page 4

Appendix A
Figure and Drawings

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SITE LOCATION
CHARLOTTE MOTOR SPEEDWAY LANDFILL
BASE MAP SOURCE:
5105 MOREHEAD ROAD
USGS TOPOGRAPHIC MAP, 7.5 MINUTE SERIES,
CONCORD, NC 28027
HARRISBURG, NORTH CAROLINA, 2016
SCS ENGINEERS
FIGURE 1 - SITE LOCATION MAP

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Appendix B
Soil Gas Probe Boring Logs

Environmental Consultants
CMS Landfill
2520 Whitehall Park Drive, Suite 450
BORING LOG
Charlotte, NC 28273
Charlotte, NC
704 504-3107 FAX [phone]
P-01
Northing: N/A
Easting: N/A
Surface Elevation:
Depth in
Monitoring Well Installation
TOC Elevation:
Feet
SOIL DESCRIPTION
Details
Boring Depth: 15'
Water Level BGS:
2.5 feet of PVC stickup w/sample port
0
Native Soil, 0 to 1 feet B.G.S.
Topsoil/Vegetation
PVC T-Fitting, 1 feet B.G.S.
1
1 to 2.5 feet B.G.S
1 to 3 feet B.G.S.
2" Diameter, Schedule 40 PVC
2
Red -Brown, Tan, sandy SILT with clay (ML), dry
Casing w/ Bentonite Seal
3
4
3 to 6 feet B.G.S.
Light Brown, Light Tan, sandy SILT with clay (ML), dry
5
6
2.5 to 12.5 feet B.G.S
Filter Pack, Sand
7
8
9
10
6 to 15 feet B.G.S.
Brown, Tan, Gray, sandy SILT with Partially Weathered
2.5 to 12.5 feet B.G.S.
Rock (PWR)(ML), saprolitic, , dry
2-inch diameter, slotted schedule
11
40 PVC well casing pipe
12
13
14
15
Boring terminated at 15' B.G.S.; borehole collapse to
12.5' B.G.S. druing probe install
Drilling Company: AE Drilling Services Boring Diameter: 4.25" Date Started: 6/18/2018
Drilling Method: Hollow Stem Auger Well Diameter: 2" Date Ended: 6/18/2018
Logged by: J. Hamela Casing Material: PVC Time Started: 1300
Time Ended: 1515

Environmental Consultants
2520 Whitehall Park Drive, Suite450
Charlotte, NC 28273
704 504-3107 FAX [phone]
CMS Landfill
Charlotte, NC
BORING LOG
P-02
Depth in
Feet
SOIL DESCRIPTION
Monitoring
Well
Details
Installation
Northing: N/A
Easting: N/A
Surface Elevation:
TOC Elevation:
Boring Depth: 29'
Water Level BGS: N/A
2.5 feet of PVC stickup
w/ sample port
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
Topsoil/Vegetation
-
Native Soil, 0 to 1 feet B.G.S.
PVC T-Fitting, 1 feet B.G.S.
1 to 2.5 feet B.G.S
2" Diameter, Schedule 40 PVC
Casing w/ Bentonite Seal
2.5 to 29 feet B.G.S
Filter Pack, Sand
9 to 19 feet B.G.S.
Soil cuttings had strong rotten odor
2.5 to 29 feet B.G.S.
2-inch diameter, slotted schedule 40 PVC
well casing pipe
Drilling Company: AE Drilling Services Boring Diameter: 4.25" Date Started: 6/19/2018
Drilling Method: Hollow Stem Auger Well Diameter: 2" Date Ended: 6/19/2018
Logged by: J. Timmons Casing Material: PVC Time Started: 1407
Time Ended: 1715

Environmental Consultants
2520 Whitehall Park Drive, Suite 450
CMS Landfill
BORING LOG
Charlotte, NC 28273
704 504-3107 FAX [phone]
Charlotte, NC
P-03
Northing: N/A
Easting: N/A
Surface Elevation:
Depth in
Gas
Probe
TOC Elevation:
Feet
SOIL DESCRIPTION
Installation
Details
Boring Depth: 18.5'
Water Level BGS: 13.7'
2.5 feet of PVC Stickup
w/ Sample Port
0
Topsoil/Vegetation
Native Soil, 0 to 1 feet B.G.S.
PVC T-Fitting, 1 feet B.G.S.
1
1 to 2.5 feet B.G.S
2" Diameter, Schedule 40 PVC
2
Casing
w/ Bentonite Seal
3
4
5
2.5 to13.7 feet B.G.S.
Filter Pack, Sand
6
7
8
2.5 to 13.7 feet B.G.S.
9
2-inch diameter, slotted schedule 40
PVC well casing pipe
10
11
12
13
13.7 feet B.G.S.
Groundwater
14
15
Boring terminated at approximately 20.5 feet B.G.S.due
16
to groundwater intrusion into borehole. A 1.5 foot
bentonite plug ( 17 to 18.5 feet B.G.S.) was installed.
Filter Sand was installed from 13.7 to 17 feet B.G.S.
17
18
Drilling Company: AE Drilling Services Boring Diameter: 4.25" Date Started: 6/19/2018
Drilling Method: Hollow Stem Auger Well Diameter: 2" Date Ended: 6/19/2018
Logged by: J. Timmons Casing Material: PVC Time Started: 1102
Time Ended: 1159