16055-Loftis-Blythe-2019 Annual Methane Monitoring Report

hart ''• hickman
SMARTER ENVIRONMENTAL SOLUTIONS
Via Email
January 31, 2020
NC Department of Environmental Quality-
Brownfields Program
1646 Mail Service Center
Raleigh, NC 27699-1464
Attention: Ms. Joselyn Harriger
Re: 2019 Annual Methane Monitoring Report
Loftis-Blythe Construction Site
5600 and 5518 David Cox Rd.
Charlotte, North Carolina
Brownfields ID 16055-12-060
H&H Job No. HTZ-003
Dear Joselyn:
On behalf of 5518 and 5600 David Cox Road, LLC, Hart & Hickman (H&H) is providing the
attached 2019 Annual Methane Monitoring Report for the Loftis-Blythe Construction Site
Brownfields project located at 5518 and 5600 David Cox Road in Charlotte, North Carolina.
Should you have any questions or comments please do not hesitate to contact us.
Sincerely,
Hart & Hickman, PC
John Lopez, PG
Senior Project Geologist
Cc: Curtis Michael
Enclosure
2923 South Tryon Street, Suite 1 CO 3921 Sunset Ridge Rd . Suite 301
Charlotte, NC 28203 Raleigh, NC 27607 www.harthick man.cam
704.586.0007 main 919_847.424r main

2019 Annual Methane Monitoring Report
Loftis-Blythe Construction Site
(aka InnerLoop North Industrial Park)
5600 and 5518 David Cox Rd.
Charlotte, North Carolina
Brownfields Project No. 16055-12-060
H&H Job No. HTZ-003
January 31, 2020
1
hart 0—%• hickman
SMARTER ENVIRONMENTAL SOLUTIONS
2923 South Tryon Street, Suite 100 3334 Hillsborough Street
Charlotte, NC 28203 Raleigh, NC 27607 www.harthickman.com
704.586.0007 main 919.847.4241 main

2019 Annual Methane Monitoring Report
Loftis-Blythe Construction Site
(aka InnerLoop North Industrial Park)
5600 and 5518 David Cox Rd.
Charlotte, North Carolina
H&H Job No. HTZ-003
Table of Contents
Section Page No.
1.0 Introduction................................................................................................................1
2.0 Background................................................................................................................ 3
3.0 Methane Monitoring, Alarms, and Annual System Testing .................................. 6
3.1 Methane Monitoring Results................................................................................... 6
3.2 Methane Warning System Alarms........................................................................... 7
4.0 Summary and Conclusions........................................................................................ 8
T :"I- -r'r—I l—
Table 1 Methane Probe Monitoring Results
Table 2 Indoor Methane Monitoring Results
Table 3 Manhole & Trench Methane Monitoring Results
List of Figures
Figure 1
Site Location Map
Figure 2
Subsurface Methane Monitoring Probe Location Map
Figure 3
Indoor Methane Monitoring Location Map
Figure 4
Manhole & Trench Sample Location Map
List of Appendices
Appendix A Equipment Calibration Documents
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2019 Annual Methane Monitoring Report
Loftis-Blythe Construction Site
(aka InnerLoop North Industrial Park)
5600 and 5518 David Cox Rd.
Charlotte, North Carolina
H&H Job No. HTZ-001
1.0 Introduction
Hart & Hickman, PC (H&H), has prepared this Annual Methane Monitoring Report to document
methane monitoring and methane warning system inspection and testing conducted at the Loftis-
Blythe Construction Brownfields site (Brownfields Project No. 16055-12-060) located at 5600
and 5518 David Cox Rd. in Charlotte, North Carolina. A site location map is provided as Figure
1. The site consists of two industrial buildings (Building 1 and Building 2) that were constructed
in 2015 as part of redevelopment of the site. Building 1 (5600 David Cox Rd.) is located in the
western portion of the site and is approximately 300,000 sq ft, and Building 2 (5518 David Cox
Rd.) is located in the eastern portion of the site and is approximately 100,000 sq ft. A site layout
is provided on Figure 2.
The methane monitoring and methane warning system inspection and testing were conducted in
accordance with the June 12, 2017 Methane Warning System Installation Report provided to the
Brownfields Program. The methane monitoring events were conducted in March 2019, June
2019, and September 2019. Because H&H received approval from the Brownfields Program to
reduce the methane monitoring to a semi-annual basis in September 24, 2019, methane
monitoring was not conducted in December 2019.
The methane monitoring included the collection of methane readings from four subsurface
methane monitoring probes, ambient air methane readings from Building 1 and Building 2, and
methane readings from sewer manholes and a drainage trench located in the vicinity of Building
2. The annual inspection and testing of the methane warning system installed in the western
portion of Building 2 was conducted during the September 2019 methane monitoring event.
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A brief summary of the site background is provided in Section 2.0, and the results of the methane
monitoring and methane system inspection and testing for 2019 are provided in Section 3.0.
N
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2.0 Background
Loftis Construction (also listed as Blythe Construction) previously occupied the property from
the 1970s to 1983 and operated a permitted land clearing and inert debris landfill in the central
portion of the site. The landfill was closed in 1984, and a notice was placed on the deed
indicating the location of the buried materials. The estimated extent of the landfilled materials
based upon the test pits is indicated in Figure 2. Results of test pits conducted as part of previous
assessment activities indicated that the materials present in the landfill consist of soil, rock, tires,
stumps, trees, woody debris, bricks, concrete, rebar, scrap metal, paper trash, and plastic.
In July 2013, H&H conducted Brownfields assessment activities at the site. As part of the
assessment activities, H&H conducted methane monitoring in and around the area of the former
landfill. The methane monitoring conducted during the Brownfields assessment included the
installation of 11 temporary methane probes. Five of the probes (MP-1, MP-6, MP-7, MP-10,
and MP-13) were installed within the landfill area (as identified by previous test pits), and six of
the sample locations (MP-2, MP-8, MP-9, MP-11, MP-12, and MP-14) were installed at
locations around the perimeter of the identified landfill area. The locations of the temporary
methane probes are shown on Figure 2.
The results of the initial methane monitoring indicated that MP-10 contained a concentration of
methane below the North Carolina Department of Environmental Quality (DEQ) Solid Waste
screening level of 100% of the LEL (5% methane) for property boundaries, but above the
screening level of 20% of the LEL (1.25% methane) for interior air. No other methane probes,
including methane probes surrounding MP-10, contained concentrations of methane above the
Regulation Level. The results of the methane monitoring in July 2013 are provided in Table 1.
Based on the results of the methane monitoring during the 2013 Brownfields assessment
activities, a methane monitoring plan was included in the Environmental Management Plan
(EMP) for the site to further evaluate subsurface methane concentrations as part of and after
construction activities. The methane monitoring plan included the installation and monitoring of
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four methane monitoring probes (MP-IOR, MP-15, MP-16, and MP-17) installed in the vicinity
of previous methane monitoring probe MP-10.
In accordance with the approved EMP, methane monitoring probes were installed in January
2015 and monitored approximately semi-annually (some events were delayed due to rainy
weather conditions preceding or on the planned sampling day) after completion of the
construction of the site buildings. The results of the methane monitoring indicated increasing
levels of methane in probes MP-15, MP-16, and MP- IOR near Building 2 (Figure 2 and Table 1).
As shown on Figure 2, the highest concentrations of methane were measured in MP-16 located
closer to the center of the landfill area. Because of the elevated levels of methane detected in the
probes, H&H also measured methane in indoor air in both buildings during the August 2016 and
March 2017 monitoring events to ensure that there was not an imminent hazard, and no methane
was detected.
Based on the results of the post -building construction methane monitoring, the property owner at
the time submitted a Methane Warning System Design Plan (Design Plan) for the western
portion of Building 2 to the Brownfields Program on May 16, 2017. In addition to the
installation of a methane warning system, the Design Plan included quarterly monitoring of
subsurface methane probes and possible methane accumulation areas (i.e. manholes and
trenches), indoor air monitoring for methane, and inspection and testing of the methane warning
system.
Following approval of the Design Plan, the methane warning system was installed in the western
portion of Building 2 in May 2017. A report documenting the installation of the methane
warning system (Methane Warning System Installation Report) was provided to the Brownfields
Program on June 12, 2017.
In 2017 and 2018, the quarterly methane monitoring was conducted in March, June, September,
and December and included the collection of methane readings from four subsurface methane
monitoring probes, ambient air methane readings from Building 1 and Building 2, and methane
readings from sewer manholes and a drainage trench located in the vicinity of Building 2. In
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addition, during the December 2017 and December 2018 quarterly methane monitoring events,
the annual inspection and testing of the methane warning system installed in the western portion
of Building 2 was conducted.
The western portion of Building 2 was occupied by JD Generators until December 2017.
Between December 2017 and February 2019, the western portion of Building 2 was vacant. The
western portion of Building 2 is currently occupied by Southern Pipe and Tank Company
(SPATCO) and is utilized for the storage and fabrication of piping, dispensers, and storage tanks.
Additionally, as discussed in the 2018 Annual Methane Monitoring Report, the current property
owner elected to install methane vent wells within the footprint of the landfill and adjacent to the
building to reduce the buildup of methane gas within the landfill, and reduce or eliminate the
migration of such gas under the building slab. A work plan detailing the proposed installation of
six methane vent wells was submitted to the Brownfields program on October 19, 2017 by
Engineering Consulting Services (ECS). The work plan was approved by the Brownfields
program on December 12, 2017 with the contingency of the installation of a seventh vent well in
the southern end of the footprint of the landfill. In January 2018, ECS installed the methane vent
wells at the site. Five methane vent wells were installed within the footprint of the landfill and
two vent wells were installed between the landfill and Building 2. Locations of the methane vent
wells, labeled MVW-1 through MVW-7, are shown on Figure 2.
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3.0 Methane Monitoring, Alarms, and Annual System Testing
In accordance with the approved 2017 Design Plan and correspondence with DEQ in September
2019, H&H conducted monitoring of methane probes MP-IOR, MP-15, MP-16, and MP-17 in
March, June, and September 2019. During each monitoring event, H&H also collected ambient
air methane readings from inside Building 1 and Building 2. Locations of the methane probes
and ambient air samples are shown on Figure 2 and Figure 3, respectively. In addition, each
monitoring event included the collection of methane readings from the sanitary sewer manholes
north of Building 2 and the drainage trench south of Building 2. Locations of the sewer
manholes and drainage trench are shown on Figure 4. Lastly, as part of the monitoring, unpaved
and paved areas were inspected for the presence of settlement areas which could be locations of
potential methane gas accumulation.
The methane monitoring events were conducted on March 29, 2019, June 26, 2019, and
September 25, 2019. Methane levels in the monitoring probes, indoor ambient air, sewer
manholes, and drainage trench were collected utilizing a calibrated Landtec GEM 5000.
Equipment calibration documents for the Landtec GEM 5000 are provided as Appendix A. The
readings collected during monitoring included methane, carbon dioxide, and oxygen. Barometric
pressure was also recorded with the GEM 5000 for each monitoring event. During the
monitoring events, an in -line carbon filter was used. Prior to sampling, the carbon filter was
conditioned with methane in accordance with the manufacturer's specifications prior to
monitoring.
The annual methane warning system inspection and testing was performed on September 25,
2019. The inspection included verifying communication of the sensors to the central control
panel, testing a representative number of sensors, and confirming that each sensor's green
"armed" light was illuminated at the time of the inspection.
3.1 Methane Monitoring Results
The results of methane monitoring conducted in March, June, and September 2019 indicated the
presence of methane in MP-16 (ranging from 51.8% to 59.6%), MP- IOR (ranging from 13.1% to
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19.7%), and MP-15 (ranging from 10.9% to 13.9%) above the most conservative methane
screening level of 1.25% during each of the methane monitoring events. Methane was not
detected above 0.0% in MP-17 during the 2019 monitoring events. In general, the methane
concentrations detected were consistent with recent and previous methane monitoring events
conducted at the site, and methane concentrations detected in the subsurface monitoring points
appear to be generally stable since quarterly sampling began in March 2017. A summary of the
methane probe readings is provided in Table 1.
Methane was not detected inside either of the two buildings at the site during the methane
monitoring events. In addition, methane was not detected in the sanitary sewer manholes or
trench drain during the methane monitoring events.
The results of the site visual inspections did not indicate the presence of settlement areas at the
site that could result in potential accumulation of methane gas. Results of indoor air methane
monitoring conducted at the site are provided as Table 2 and depicted on Figure 3. Results of the
manhole and trench methane monitoring conducted at the site are summarized in Table 3 and
depicted on Figure 4.
As part of the monitoring activities in 2019, H&H also screened the exhaust of the methane vent
wells (MVW-1 through MVW-7) utilizing the Landtec GEM 5000. The result of the screening
did not indicate the presence of methane in the exhaust of the methane vent wells.
3.2 Methane Warning System Alarms
H&H has not been notified of a methane alarm in 2019. As indicated in the Design Plan, in the
event of an alarm, building occupants will be notified by a visual and audible signal in the office,
warehouse space, and entryway of the western portion of Building 2 which will prompt an
evacuation.
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4.0 Summary and Conclusions
The results of the 2019 methane monitoring events indicated concentrations of methane in MP-
16, MP-10R, and MP-15 above the most conservative methane screening level of 1.25%.
Detected methane concentrations are consistent with recent previous methane monitoring events
conducted at the site and appear to be generally stable. Methane was not detected in ambient air
inside either of the two buildings at the site or the trench drain near Building 2 during the
methane monitoring events. In addition, settlement areas where methane gas could potentially
accumulate were not observed during the quarterly monitoring events.
To date, methane has not been observed in ambient air in either of the two on -site buildings or
potential receptors in the vicinity of the landfill area. However, as a precautionary measure, the
current landowner elected to install seven methane gas vent wells to assist with the ventilation
and reduce the potential for migration of methane gas within and around the landfill area. In
January 2018, ECS installed the methane vent wells at the site. Based on the data collected
following the installation of the methane vent wells, it does not appear that they have had a
significant effect on reducing methane levels at the locations of the subsurface methane
monitoring probes. However, methane levels detected in the subsurface monitoring probes are
generally stable.
Based on the generally stable subsurface methane levels, no detections of methane in ambient
indoor air in Building 1 or Building 2, and the presence of a methane warning system in Building
2, H&H recommends continued semi-annual methane monitoring at the Site. In accordance with
correspondence from DEQ, the property owner will continue to conduct the methane monitoring
on a semi-annual basis. It is anticipated that the semi-annual methane monitoring will be
conducted in March and September of each year. The September semi-annual methane
monitoring event will also include the annual system testing and inspection. Following the
September monitoring event, an Annual Methane Monitoring Report will be provided to DEQ.
The report will include the methods and results of the semi-annual methane monitoring and
annual methane warning system inspection.
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TABLES
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Table 1 (Page 1 of 2)
Methane Probe Monitoring Results
Loftis-Blythe Construction Site
(aka Innerloop North Industrial Park)
5600 David Cox Rd
H&H Job No. HTZ-003
Sampling
Location
�?
Well ID
Date
Ambient/Subsurface
Landfill/Perimeter
Ambient
0.0
04/02/15
Subsurface
0.0
Ambient
0.0
11/17/15
Subsurface
4.2
Ambient
0.1
08/04/16
Subsurface
11.6
Ambient
0.0
03/08/17
Subsurface
16.0
Ambient
0.0
06/30/17
Subsurface
14.9
Ambient
0.0
09/28/17
Subsurface
13.5
Ambient
0.0
12/27/17
Subsurface
15.5
MP-10R
Landfill
Ambient
0.0
03/23/18
Subsurface
16.6
Ambient
0
06/29/18
Subsurface
13.6
Ambient
0.0
09/21/18
Subsurface
10.8
Ambient
0.0
12/26/18
Subsurface
14.2
Ambient
0.0
03/29/19
Subsurface
19.7
Ambient
0.0
06/26/19
Subsurface
15.5
Ambient
0.0
09/25/19
Subsurface
13.1
Ambient
0.0
04/02/15
Subsurface
0.0
11/17/15
Ambient
0.0
Subsurface
2.6
08/04/16
Ambient
0.0
Subsurface
8.7
Ambient
0.0
03/08/17
Subsurface
12.4
Ambient
0.0
06/30/17
Subsurface
13.8
Ambient
0.0
09/28/17
Subsurface
13.1
Ambient
0.0
12/27/17
Subsurface
13.8
MP-15
Perimeter
Ambient
0.0
03/23/18
Subsurface
14.5
Ambient
0.0
06/29/18
Subsurface
14.7
Ambient
0.0
09/21/18
Subsurface
12.5
Ambient
0.0
12/26/18
Subsurface
11.9
Ambient
0.0
03/29/19
Subsurface
13.9
Ambient
0.0
06/26/19
Subsurface
12.2
Ambient
0.0
09/25/19
Subsurface
10.9
DEQ Sot Waste Section Sceening Level
<1.25
0.6 21.4 78.0
6.8 2.8 90.0
0.1 20.9 78.8
9.7 0.2 85.0
0.1
10.8
20.8
0.5
79.1
72.6
0.2
20.5
79.3
11.2
0.9
73.0
0.2
19.8
80.0
12.7
0.7
73.1
0.1
22.7
77.2
8.7
0.1
74.7
0
20.5
79.4
9.5
0.7
76.1
0
21.2
79.2
10.8
0.1
78.3
0.1
21.8
78.1
11.8
0.5
73.5
0.1
20.2
79.7
8.8
0.1
71.4
0.0
20.3
79.7
9.3
0.1
75.2
0.0
20.2
79.7
10.1
0.3
75.3
0.9
21.2
78.0
6.9
2.1
78.0
0.2
20.7
79.1
11.1
0.6
83.9
0.1
23.1
21.4
0.8
78.5
63.4
0.6
20.5
78.9
21.7
0.4
63.9
0.2
19.5
80.3
24.3
0.2
62.4
0.1
19.2
23.6
0.3
76.3
66.0
0.0
20.5
79.5
20.0
0.8
65.0
0.1
20.2
79.6
22.5
0.2
64.8
0.1
22.5
20.2
0.0
79.7
63.5
0.0
20.3
79.6
21.8
0.2
65.8
0.0
20.2
79.7
25.0
0.1
63.9
Notes
Bold indicates concentration exceeds screening level.
Screening level based upon DEQ Solid Waste Section regulations for
facility structures of 25% LEL (1.25% methane).
MP = Methane Probe
Ambient Measurements were taken adjacent to MP locations immediatley prior to subsurface reading.
Readings collected with a conditioned in -line charcoal filter.
Table 1 (Page 1 of 2)
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Table 1 (Page 2 of 2)
Methane Probe Monitoring Results
Loftis-Blythe Construction Site
(aka Innerloop North Industrial Park)
5600 David Cox Rd
H&H Job No. HTZ-003
Sampling
Location
�?
Well ID
Date
Ambient/Subsurface
Landfill/Perimeter
Ambient
0.0
04/02/15
Subsurface
31.3
Ambient
0.0
11/17/15
Subsurface
34.6
Ambient
0.1
08/04/16
Subsurface
46.0
Ambient
0.0
03/08/17
Subsurface
36.2
Ambient
0.0
06/30/17
Subsurface
36.1
Ambient
0.0
09/28/17
Subsurface
40.3
Ambient
0.0
12/27/17
Subsurface
39.5
MP-16
Landfill
Ambient
0.0
03/23/18
Subsurface
33.4
Ambient
0.0
06/29/18
Subsurface
33.6
Ambient
0.0
09/21/18
Subsurface
35.6
Ambient
0.0
12/26/18
Subsurface
56.7
Ambient
0.0
03/29/19
Subsurface
51.8
Ambient
0.0
06/26/19
Subsurface
57.8
Ambient
0.0
09/25/19
Subsurface
59.6
Ambient
0.0
04/02/15
Subsurface
0.0
Ambient
0.0
11/17/15
Subsurface
0.0
08/04/16
Ambient
0.0
Subsurface
0.4
Ambient
0.0
03/08/17
Subsurface
0.6
Ambient
0.0
06/30/17
Subsurface
0.1
Ambient
0.0
09/28/17
Subsurface
0.1
Ambient
0.0
12/27/17
Subsurface
0.2
MP-17
Perimeter
Ambient
0.0
03/23/18
Subsurface
0.0
Ambient
0.0
06/29/18
Subsurface
0.0
Ambient
0.0
09/21/18
Subsurface
0.0
Ambient
0.0
12/26/18
Subsurface
0.1
Ambient
0.0
03/29/19
Subsurface
0.0
Ambient
0.0
06/26/19
Subsurface
0.0
Ambient
0.0
09/25/19
Subsurface
0.0
DEQ Solid Waste Section Sceening Level
<1.25
0.4 1 21.4 1 78.1
0.2 22.8 76.9
16.0 1.2 36.8
0.1 20.4 79.5
22.0 0.3 41.5
0.1 20.0 78.4
19.5 0.4 40.8
0.2 22.7 77.2
16.8 0.2 49.6
0.1
21.9
78.0
17.4
0.5
25.5
0.1
20.3
79.4
12.0
0.1
16.2
0.0
20.1
79.8
11.9
0.1
30.2
0.0
20.2
79.8
13.9
0.1
26.3
1.8
14.6
83.7
0.3
21.5
1 78.2
0.1
20.8
79.2
5.7
0.4
93.0
0.4
22.1
77.5
12.2
0.1
87.3
0.1
19.9
80.0
8.7
2.4
88.0
0.2
20.6
79.2
10.6
0.1
89.2
0.5
19.8
79.8
11.6
0.2
87.9
0.2
20.6
79.2
9.3
0.4
89.9
0.1
22.7
77.2
8.4
0.3
91.3
0.0
20.6
79.3
9.4
0.3
90.2
0.3
20.2
79.1
10.6
0.2
89.1
0.0
21.4
78.5
11.7
0.8
87.5
0.1
20.4
79.5
9.7
0.1
90.2
0.0
20.2
79.8
10.3
0.1
89.6
Notes
Bold indicates concentration exceeds screening level.
Screening level based upon DEQ Solid Waste Section regulations for
facility structures of 25% LEL (1.25% methane).
MP = Methane Probe
Ambient Measurements were taken adjacent to MP locations immediatley prior to subsurface reading.
Readings collected with a conditioned in -line charcoal filter.
Table 1 (Page 2 of 2)
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FIGURES
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Srarken� ug t� -r.' 1. j I
APPROXIMATE
N 0 2000 4000
TITLE
SITE LOCATION MAP
SCALE IN FEET
PROJECT LOFTIS-BLYTHE CONSTRUCTION SITE
5600 AND 5518 DAVID COX ROAD
CHARLOTTE, NORTH CAROLINA
U.S.G.S. QUADRANGLE MAP
DERITA, NC 1996
2923 S. Tryon Street, Suite 100
hart "Z hickman Charlotte, NC28203
w 704.586.0007(p) 704.586.0373(o
QUADRANGLE
7.5 MINUTE SERIES (TOPOGRAPHIC)
DATE: 01-23-20
REVISION NO: 0
JOB NO: HTZ-003
FIGURE: 1

I
ETHANE PROBE ID rSAMPLE DATE
LEGEND
IMP-10R 4/2/15 11/17/15 8/4/16 3/8/17 6/30/17 9/28/17 12/27/17 3/23/18 6/29/18 9/21/18 12/26/18 3/29/19 6/26/19 9/25/19
ANE 0.0 4.2 11.6 16.0 14.9 13.5 15.5 16.6 13.6 10.8 14.2 19.7 15.5 13.1 SITE PROPERTY BOUNDARY
CONSTITUENT__� _ ^
_ I CONCENTRATION % CHAINLINK FENCE
- - - - I ` APPROXIMATE EXTENT OF
LANDFILL AREA
MP-15
4/2/15 11/17/15 8/4/16 3/8/17
6/30/17 9/28/17 12/27/17 3/23/18 6/29/18 9/21/18 12/26/18 3/29/19 6/26/19 9/25/19
PERMANENT METHANE PROBE
®
METHANE
0.0 2.6 8.7 12.4
13.8 13.1 13.8 14.5 14.2 12.5 11.9 13.9 12.2 10.9
LOCATION
I
BATHROOMS PAVED
I
I
�
® TEMPORARY METHANE PROBE
AREA
I
LOCATION (JULY 2013)
MP-17 4/2/15 11/17/15 8/4/16
3/8/17 6/30/17
9/28/17 12/27/17
3/23/18 6/29/18 9/21/18
12/26/18 3/29/19 6/26/19 9/25/19
I
METHANE 0.0 0.0
0.4 0.6
0.1 0.1 0.2
0.0 0.0
0.0 0.1 0.0 0.0 0.0
I
APPROXIMATE LOCATION OF
p
WAREHOUSE
I
METHANE VENT WELL
1
OFFICES
(INSTALLED JANUARY 2018)
O
(x
MP-11
-
- - - DUKE POWER RIGHT-OF-WAY
J
BUILDING 1
MVW-6
® I-9
WAREHOUSE
(5600 DAVID COX ROAD)--
(SPATCO)
W
MP-17 I MP-15
I
OFFICES
MP-12
W
I * VF5 4
MVW-7
BUILDING 2
MP-10
I
(5518 DAVID COX ROAD)
p
PAVED
I I
-�
O
AREA
1\
MP-10R
WAREHOUSE
-
09MVW-4
(TIRE WHOLESALES)
MVW-8
-
MI i -3®I MP-1
MP-8
I �
NOTE:
MP-14®
I ®MP-7
P-13
OFFICES
BOLD CONCENTRATION INDICATES
MP-16 4/2/15 11/17/15
8/4/16 3/8/17
6/30/17 9/28/17 12/27/17 3/23/18 6/29/18 9/21/18 12/26/18 3/29/19 6/26/19 9/25/19
I I
PAVED
EXCEEDANCE OF DEQ SOLID WASTE
SECTION SCREENING LEVEL OF 1.25%.
MVW-2
I
AREA
METHANE 31.3 34.6
46.0 1 36.2
1 36.1 1 40.3 1 39.5
33.4 33.6
1 35.6 1 56.7 1 51.8 57.8 59.6
` I
WAREHOUSE
I I
MP-6
I
I 1 I MVW-1
1B,MP-1 MP-10R 4/2/15 11/17/15 /16 8/43/8/17 6/30/17 9/28/17 12/27/17 3/23/18 6/29/18 9/21/18 12/26/18 3/29/19 6/26/19 9/25/19
METHANE 0.0 4.2 11.6 16.0 14.9 13.5 15.5 16.6 13.6 10.8 1 14.2 1 19.7 15.5 1 13.1
IMPPAVED
AREA
I I
I I APPROXIMATE
0 150 300
SCALE IN FEET
PAVED I I E
/ AREA ` SUBSURFACE METHANE MONITORING
PROBE LOCATION MAP
PROJECT LOFTIS-BLYTHE CONSTRUCTION SITE
5600 DAVID COX ROAD
CHARLOTTE, NORTH CAROLINA
DA VID COx2923 South Tryon Street -Suite 100
ROAD . hart !'` h i c k m a n Charlotte. North Carolina 28203

I
AMB-4 8/4/16 3/8/17 6/30/17 9/28/17 12/27/17 3/23/18 6/29/18 9/21/18 12/26/18 3/29/19 6/26/19 9/25/19
METHANE 1 0.0 0.0 0.0 1 0.0 1 0.0 1 0.0 1 0.0 1 0.0 1 0.0 1 0.0 0.0 0.0
AMB-2 1 8/4/16 3/8/17 6/30/17 9/28/17 12/27/17 3/23/18 6/29/18 9/21/18 12/26/18 3/29/19 6/26/191 9/25/19
METHANE 1 0.0 1 0.0 1 0.0 0.0 1 0.0 1 0.0 1 0.0 1 0.0 1 0.0 1 0.0 1 0.0'Zz I
0.0
1
I
Q
Q
I
1
I
O
cr-
I
W
J
1
�
co
I
I
c/)
I
1 PAVED
O
1 AREA
ETHANE PROBE ID
197V9:1
LEGEND
- - SITE PROPERTY BOUNDARY
CHAINLINK FENCE
CONSTITUENT, 'CONCENTRATION
- APPROXIMATE EXTENT OF
CES
4AMB-2
WAREHOUSE
BUILDING 1
(5600 DAVID COX ROAD)
AMB-3
AMB-1 8/4/16 3/8/17 6/30/17 9/28/17 12/27/17 3/23/18 6/29/18 9/21/18 12/26/18 3/29/19 6/26/19 9/25/19
METHANE 0.0 0.0 0.0 0.0 0.0 1 0.0 1 0.0 0.0 0.0 0.0 0.0 0.0
AMB-3 8/4/16 3/8/17 6/30/17 9/28/17 12/27/17 3/23/18 6/29/18 9/21/18 12/26/18 3/29/19 6/26/19 9/25/19
METHANE 0.0 0.0 0.0 1 0.0 1 0.0 1 0.0 1 0.0 1 0.0 0.0 0.0 0.0 0.0
1 WAREHOUSE
I
1
1
I
1
I
I
1
1
/
/
PAVED
oNREA� D
PAVED
AREA
DA V/-X D
AMB-5 8/4/16 3/8/17 6/30/17 9/28/17 12/27/17 3/23/18 6/29/18 9/21/18 12/26/18 3/29/19 6/26/19 9/25/19 LANDFILL AREA
METHANE 0.0 0.0 0.0 1 0.0 1 0.0 0.0 1 0.0 1 0.0 1 0.0 1 0.0 1 0.0 0.0 PERMANENT METHANE PROBE
® LOCATION
AMB-6 1 8/4/16 3/8/17 6/30/17 9/28/17 12/27/17 3/23/18 6/29/18 9/21/18 12/26/18 3/29/19 6/26/19 9/25/19
i PAVED I METHANE 0.0 0.0 0.0 0.0 1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 F" AMBIENT AIR SAMPLE
AREA
APPROXIMATE LOCATION OF
♦ ® METHANE VENT WELL
FICES ` ` - - - - DUKE POWER RIGHT-OF-WAY
NOTE:
AMB-5
MVW-6® WAREHOUSE
I I(SPATCO) � ♦ BOLD CONCENTRATION INDICATES / ^ �♦ EXCEEDANCE OF DEQ SOLID WASTE SECTION
A ('SP
AMP-17 I &MP-15 `� ` SCREENING LEVEL.
(IMVW-5 BUILDING 2
/MVw-7 (5518 DAVID COX ROAD)
®
MP-1010R WAREHOUSE
MVW-4 �MVw 8 (TIRE WHOLESALES)
AMB-8
M'V -3®I MP-16
jl
AMB 7 OFFICES
I I �PA ED
MVW-2 EA-"\
I
-MVW1 i
I J I
I41
' AMB-7 8/4/16 1 3/8/17 6/30/17 9/28/17 12/27/17 3/23/18 6/29/18 9/21/18 12/26/18 3/29/19 6/26/19 9/25/19
III I METHANE 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
AMB-8 1 8/4/16 3/8/17 6/30/17 9/28/17 12/27/17 3/23/18 6/29/18 9/21/18 12/26/18 3/29/19 6/26/19 9/25/19
METHANE 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
/ I I
I I
APPROXIMATE
0 150 300
SCALE IN FEET
I E
♦ I INDOOR METHANE MONITORING LOCATION MAP
PROJECT LOFTIS-BLYTHE CONSTRUCTION SITE
5600 DAVID COX ROAD
CHARLOTTE, NORTH CAROLINA
`I I 2923 South Tryon Street -Suite 100
_ ♦ hart !'` h i c k m a n Charlotte. North Carolina 28203

I
I
I
I
I
I
I
I
I
I
I
SAMPLE ID SAMPLE DATE
MANHOLE-2 6/30/17 9/28/17 12/27/17 3/23/18 6/29/18 1 9/21/18 12/26/18 3/29/19 1 6/26/19 1 9/25/19
METHANE 0.0 0.1 0.0 0.0 0.0 1 0.0 1 0.0 1 0.0 1 0.0 1 0.0
CONSTITUENT CONCENTRATION %
MANHOLE-3 16/30/17 19/28/17 112/27/171 3/23/18 16/29/18 19/21 /18 112/26/181 3/29/19 16/26/19 19/25/19
METHANE 1 0.0 1 0.1 1 0.0 1 0.0 1 0.0 1 0.0 1 0.0 1 0.0 1 0.0 1 0.0
OFFICES WAREHOUSE MANHOLE-216/30/17 9/28/17 12/27/17 3/23/18 6/29/18 9/21/18 12/26/18 3/29/19 6/26/19 9/25/19
(SPATCO) METHANE 1 0.0 0.1 1 0.0 1 0.0 1 0.0 1 0.0 1 0.0 1 0.0 1 0.0 1 0.0
®MP-15
BUILDING 2
(5518 DAVID COX ROAD)
®MP-10RTRENCH-1 6/30/17 9/28/17 12/27/17 3/23/18 6/29/18 9/21/18 12/26/18 3/29/19 6/26/19 9/25/19
\ ,cy7 METHANE 1 0.0 0.0 0.0 0.0 0.0 0.0 1 0.0 1 0.0 1 0.0 1 0.0
WAREHOUSE
(TIRE WHOLESALE)
PAVED
AREA
MANHOLE-1
MAN HOLE-1 16/30/17 19/28/17 I12/27/17I 3/23/18 16/29/18 19/21 / 18 112/26/181 3/29/19 16/26/19 19/25/19
METHANE 1 0.0 1 0.0 1 0.0 1 0.0 1 0.0 1 0.0 1 0.0 1 0.0 1 0.0 1 0.0
OFFICES
LEGEND
SITE PROPERTY BOUNDARY
- - - - DUKE POWER RIGHT-OF-WAY
-->-->- TRENCH DRAIN
SANITARY SEWER MANHOLE
® PERMANENT METHANE PROBE
LOCATION
0
APPROXIMATE
0 50 100
SCALE IN FEET
TITLE
MANHOLE & TRENCH SAMPLE LOCATION MAP
PROJECT LOFTIS-BLYTHE CONSTRUCTION SITE
5600 DAVID COX ROAD
CHARLOTTE, NORTH CAROLINA
100
hart � h i c k m a n Clar South Tryon Carolina
282 3
Charlotte, North Carolina 28203
704-586-0007(p) 704-586-0373(f
SMARTER ENVIRONMENTAL SOLUTIONS License # C-1269 / #C-245 Geology
DATE: 1-14-20 REVISION NO. 0
JOB NO. HTZ-003 FIGURE NO. 4

Appendix A
Equipment Calibration Documents

■�
ZJ�.J
CALIBRATION LOG
LANDTEC - GEM 5000+
ES # 1255
Calibrated materials required:
OXYGEN Lot: EBJ-161-4-5
LOW Exp: 5/8/2023
OXYGEN Lot: LBI-1-8
HIGH Exp: 12/27/2022
Methane Lot: EBJ-399-5
High Exp: 5/8/2023
Carbon Filter Saturation (CH4) - Condition: PASS
now
METHANE Lot:
LOW Exp:
CARBON Lot:
MONOXIDE Exp:
HYDROGEN Lot:
SULFIDE Exp:
FBJ-341TSM-1
5/08/20233
FBJ-49-1000-1
5/8/2023
FBJ-98-200-1
05/08/21
Gas Calibration Check Performed at Room Temperature
SENSOR
GEM 5000+ (FRES
Initial Reading CAL Reading
TIO
Tolerance
Comments
CH4 (%)
0.0
0.0
+/- 0.5%
CO m)
0.0
0.0
+/- 5 ppm
1-12S (ppm)
0.0
0.0
+/- 5 ppm
H2 (%)
0.0
0.0
+/- 1.5%
GEM 5000+ (MULTI SPAN GAS CALIBRATION)
METHANE HIGH CALIBRATION
SENSOR
Initial Reading
CAL Reading
Tolerance
Comments
CH4 (%)
49.9
50.0
+/- 0.5%
CO2 (%)
35.1
35.0
+/- 1.5%
02 (%)
0.0
0.0
+/- 1.5%
METHANE LOW CALIBRATION
SENSOR
Initial Reading
CAL Reading
Tolerance
Comments
CH4 %
10.0
10.0
+/- 0.5%
CO2 (%)
10.0
10.0
+/- 1.5%
02 (%)
0.0
0.0
+/- 1.5%
OXYGEN HIGH CALIBRATION
SENSOR
Initial Reading
CAL Reading
Tolerance
Comments
02 (%)
20.9
20.9
+/- 0.5%
OXYGEN LOW CALIBRATION
SENSOR
Initial Reading
CAL Reading
Tolerance
Comments
02 (%)
4.3
4.0
+/- 0. 5 %
CARBON MONOXIDE
CALIBRATION
SENSOR
Initial Reading
CAL Reading
Tolerance
Comments
CO (ppm)
1008
1000
+/- 50 ppm
SENSOR
Initial Reading
CAL Reading
Tolerance
Comments
H2S (ppm)
201
200
+/- 10 ppm
Signature: RQA Date: 06/24/2019

e-1
� Jk-p
CALIBRATION LOG
LANDTEC -GEM 5000+
ES # 1255
Calibrated materials required:
OXYGEN Lot: EBJ-161-4-5
LOW Exp: 5/8/2023
OXYGEN Lot: LBI-1-8
HIGH Exp: 12/27/2022
METHANE Lot: EBJ-399-5
HIGH Exp: 5/8/2023
Carbon Filter Saturation (CH4) - Condition: PASS
METHANE Lot:
LOW Exp:
CARBON Lot:
MONOXIDE Exp:
HYDROGEN Lot:
SULFIDE Exp:
FBJ-341TSM-1
5/8/2023
FBJ-49-1000-1
5/8/2023
FBJ-98-200-1
5/8/2021
Gas Calibration Check Performed at Room Temperature
5000+
(FRESH AIR CALIBRATION)
SENSOR
Initial Reading
CAL Reading
Tolerance
Comments
CH4 (%)
0.0
0.0
+/- 0.5%
CO (ppm)
0.0
0.0
+/- 5 ppm
H2S (ppm)
0.0
0.0
+/- 5 ppm
H2 (%)
1 -0.4
1 0.0
1 +/- 1.5%
SENSOR
EM 5000+ (MULTI SPAN GAS CALIBRATIO
METHANE HIGH CALIBRATIO
Initial Reading CAL Reading Tolerance
Comments
CH4 (%)
47.1
50.0
+/- 0.5%
CO2 (%)
33.5
35.0
+/- 1.5%
02 (%)
SENSOR
0.0 0.0
METHANE L
Initial Reading CAL Reading
+/- 1.5%
Tolerance
Comments
CH4 (%)
10.6
10.0
+/- 0.5%
CO2 (%)
10.3
10.0
+/- 1.5%
02 (%)
0.0
0.0
+/- 1.5%
OXYGEN HIGH CALIBRATION
SENSOR
Initial Reading
CAL Reading
Tolerance
Comments
02 (%)
20.8
20.9
+/- 0.5%
SENSOR
Initial Reading
CAL Reading
Tolerance
Comments
02 (%)
4.2
4.0
+/- 0.5%
CARBON MONOXIDE CALIBRATION
SENSOR
Initial Reading
CAL Reading:=
Tolerance
Comments
CO (ppm)
992
1000
1 +/- 50 ppm
HYDROGEN SULFIDE CALIBRATION
SENSOR
Initial Reading
CAL Reading
Tolerance
Comments
H2S (ppm)
198
200
+/- 10 ppm
Signature: FZ Date: 09/25/2019