16055-Loftis-Blythe-2023 Annual Methane Monitoring Report-20240102

2023 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 2, 2024
hart hickman
SMARTER ENVIRONMENTAL SOLUTIONS
2923 South Tryon Street, Suite 100 3921 Sunset Ridge Rd, Suite 301
Charlotte, NC 28203 Raleigh, NC 27607 www.harthickman.com
704.586.0007 main 919.847.4241 main

2023 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 Pam
1.0 Introduction................................................................................................................ I
2.0 Background................................................................................................................ 2
3.0 Methane Monitoring, Alarms, and Annual System Testing .................................. 5
3.1 Methane Monitoring Results................................................................................... 5
3.2 Methane Warning System Alarms and Inspection .................................................. 7
4.0 Summary and Conclusions........................................................................................ 8
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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2023 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
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 the Brownfields redevelopment of the Site. Building 1 (5600
David Cox Rd.) is located in the western portion of the Site and is approximately 300,000 square
feet (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 as 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 included 1) the collection of methane readings
from four subsurface methane monitoring probes, 2) ambient air methane readings from Building
I and Building 2, and 3) methane readings from sewer manholes and a drainage trench located in
the vicinity of Building 2. In addition, the annual inspection and testing of the methane warning
system installed in the western portion of Building 2 was conducted during the October 2023
methane monitoring event.
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 2023 are provided in Section
3.0.
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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. Results of test pit excavations conducted as part
of previous assessment activities indicated that the materials present in the landfill consisted of
soil, rock, tires, stumps, trees, woody debris, bricks, concrete, rebar, scrap metal, paper trash, and
plastic. The estimated extent of the landfilled materials based upon the test pit excavations is
indicated in Figure 2.
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 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 in July 2013 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 contained concentrations of methane above the screening level. The results of
the methane monitoring conducted in July 2013 are provided in Table 1.
Based on the results of the July 2013 Brownfields assessment activities, a methane monitoring
plan was included in the Environmental Management Plan (EMP) to further evaluate subsurface
methane concentrations during and after construction activities. The methane monitoring plan
included the installation and monitoring of four permanent methane monitoring probes (MP-IOR,
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MP-15, MP-16, and MP-17) installed in the vicinity of previous temporary 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 conducted in 2015
indicated elevated concentrations of methane in probes MP-15, MP-16, and MP-1 OR near
Building 2 (Figure 2 and Table 1). The highest concentrations of methane were detected in MP-
16 located closest to the center of the landfill area. Because of the elevated levels of methane
detected in the probes during the 2015 monitoring event, 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. No methane was detected in indoor air in either building.
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 the 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.
M
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3.0 Methane Monitoring, Alarms, and Annual System Testing
In accordance with the approved 2017 Design Plan and subsequent correspondence with DEQ in
September 2019, H&H conducted monitoring of methane probes MP-10R, MP-15, MP-16, and
MP-17 in April 2023 and October 2023. 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 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 April 20 and October 17, 2023. 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 in Appendix A. The readings collected during monitoring
events included methane, carbon dioxide, and oxygen. During the October 2023 monitoring
event, measurements of static pressure were also collected from the methane probes. Future
methane monitoring events will include the collection of static pressure readings to further
evaluate the potential for subsurface migration of methane and methane intrusion into Site
structures.
The annual methane warning system inspection and testing was performed on October 17, 2023.
The inspection included verifying the 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 April and October 2023 indicated the presence
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of methane in MP-16 (50.3% and 44.4%), MP-10R (24.4% and 25.5%), and MP-15 (21.3% and
19.6%) above the most conservative methane screening level of 1.25% during each of the
methane monitoring events. A low-level detection (0.1%) of methane was detected in MP-17
during the April 2023 monitoring event. 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. Results of the 2022 and 2023 monitoring events are shown on Figure 2.
Methane gas may pose a potential risk of explosion when present in the atmosphere or enclosed
spaces at levels between 5% and 15% by volume air. Soil is a flame arrestor which prevents the
propagation of flame in the subsurface rendering methane in soil gas non -explosive at any
concentration. Therefore, a driving mechanism (such as a pressure gradient) is needed to move
methane in soil gas to the surface for there to be a potential risk of explosion. To evaluate
potential risks associated with methane in soil gas, methane concentrations and static pressure
measurements were collected concurrently at each methane probe in October 2023.
Methane gas in the atmosphere has a very rapid diffusivity rate (approximately 0.22 square
centimeters per second [cm2/s] at 70°F)l as compared to a common petroleum -related compound
such as benzene (approximately 0.09 cm2/s at 70°F)2. It is generally accepted that without
pressure -driven advective flow created by greater than 2 inches of water differential pressure in
the subsurface, the rate of methane gas diffusion is too rapid for large volumes of methane in soil
gas to reach the surface at potentially explosive levels (Proposed Regulatory Framework for
Evaluating the Methane Hazard due to Vapor Intrusion; Bart Eklund; 2011).
The static pressure as measured by the Landtec Gem 50000 is the pressure reading at the
screened interval relative to ambient air at the instrument station. A positive static pressure
reading indicates that subsurface pressure is higher than the ambient pressure at the instrument
and is the differential pressure measurement used to evaluate the presence of increased
Diffusion of Methane and Chloromethanes in Air; Canadian Journal of Chemistry; M. Cowie and Harry Watts; 1971
z ht_pt s://www3.gpa.eov/ceampiibl/leam2model/part-two/onsite/estdiffusion.html
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subsurface pressure. As shown in Table 1, only MP-16 indicated a positive static pressure
during the October 2023 monitoring event. The static pressure detected in MP-16 (0.02 inches
of water) is two orders of magnitude below 2 inches of water and is therefore considered
negligible and not sufficient to cause migration of methane in soil gas to the surface at
potentially explosive levels.
Consistent with previous monitoring events, methane was not detected inside either of the two
buildings, trench drain, or the sewer manholes during the 2023 methane monitoring events.
Results of indoor air methane monitoring conducted at the Site are provided as Table 2, and the
results of manhole and trench methane monitoring conducted at the Site are summarized in Table
3. The methane readings for the 2022 and 2023 monitoring events are are depicted on Figure 3
and Figure 4.
Site visual inspections conducted in 2023 did not indicate the presence of settlement areas at the
Site that could result in potential accumulation of methane gas.
3.2 Methane Warning System Alarms and Inspection
As indicated above, H&H conducted a visual inspection of the methane warning system in
October 2023 as part of the semi-annual methane monitoring event. 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. The result of the annual inspection conducted by H&H in October 2023
indicated the methane warning system was operating normally. However, several faults were
observed on the warning system alarm panel which may indicate that some methane sensors are
nearing the end of their recommended lifespan.
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4.0 Summary and Conclusions
The results of the 2023 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 sewer manholes and trench drain near
Building 2 during the methane monitoring events. Settlement areas, where methane gas could
potentially accumulate, were not observed during the 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. Further, results of the static pressure
readings collected from the methane probes during the October 2023 monitoring event do not
indicate the presence of a subsurface pressure sufficient to cause migration of methane to the
surface.
In accordance with correspondence from DEQ, the property owner will continue to conduct the
methane monitoring on a semi-annual basis in 2024. It is anticipated that the semi-annual
methane monitoring will be conducted in April and October. The October semi-annual methane
monitoring event will also include the annual system testing and inspection. Following the
second 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 3)
Methane Probe Monitoring Results
Loftis-Blythe Construction Site
(aka Innerloop North Industrial Park)
5600 David Cox Rd
H&H Job No. HTZ-004
Carbon dioxide
Location
Methane (CH4)
Oxygen (02)
Balance
Static Pressure
Well ID
Sampling Date
Ambient/Subsurface
(CO2)
(Landfill/Perimeter)
Percent %
inches H2O
Ambient
0.1
0.0
20.5
79.2
NM
MP-1
07/17/13
Subsurface
Landfill
0.2
1.7
18.9
79.0
NM
Ambient
0.0
0.0
20.6
79.1
NM
MP-2
07/17/13
Subsurface
Perimeter
0.2
0.2
20.5
79.2
NM
Ambient
0.1
0.0
20.6
79.1
NM
MP-6
07/17/13
Subsurface
Landfill
0.1
5.8
13.5
80.4
NM
Ambient
0.1
0.0
20.6
79.1
NM
MP-7
07/17/13
Subsurface
Landfill
0.1
2.2
17.1
80.3
NM
Ambient
0.1
0.0
20.5
79.1
NM
MP-8
07/17/13
Subsurface
Perimeter
0.1
1.1
19.4
79.3
NM
Ambient
0.1
0.1
20.5
79.3
NM
MP-9
07/17/13
Subsurface
Perimeter
0.1
1.5
19.5
79.2
NM
Ambient
0.1
0.0
20.6
79.2
NM
MP-10
07/17/13
Subsurface
Landfill
1.6
6.9
11.2
80.1
NM
Ambient
0.1
0.1
20.5
79.1
NM
MP-11
07/17/13
Subsurface
Perimeter
0.2
2.3
18.0
79.4
NM
Ambient
0.1
0.2
20.4
79.2
NM
MP-12
07/17/13
Subsurface
Perimeter
0.1
3.6
18.3
77.9
NM
Ambient
0.1
0.0
20.6
79.1
NM
MP-13
07/17/13
Subsurface
Landfill
0.2
2.1
18.3
79.3
NM
Ambient
0.1
0.0
20.5
79.3
NM
MP 14
07/17/13
Subsurface
Perimeter
0.1
1.2
18.1
80.4
NM
04/02/15
Ambient
0.0
0.6
21.4
78.0
NM
Subsurface
0.0
6.8
2.8
90.0
NM
Ambient
0.0
0.1
20.9
78.8
NM
11/17/15
Subsurface
4.2
9.7
0.2
85.0
NM
Ambient
0.1
0.8
22.1
77.0
NM
08/04/16
Subsurface
11.6
13.1
0.9
74.4
NM
Ambient
0.0
0.1
20.8
79.1
NM
03/08/17
Subsurface
16.0
10.8
0.5
72.6
NM
Ambient
0.0
0.2
20.5
79.3
NM
06/30/17
Subsurface
14.9
11.2
0.9
73.0
NM
Ambient
0.0
0.2
19.8
80.0
NM
09/28/17
Subsurface
13.5
12.7
0.7
73.1
NM
Ambient
0.0
0.3
20.1
77.8
NM
12/27/17
Subsurface
15.5
11.5
0.0
73.0
NM
Ambient
0.0
0.1
22.7
77.2
NM
03/23/18
Subsurface
16.6
8.7
0.1
74.7
NM
Ambient
0
0
20.5
79.4
NM
06/29/18
Subsurface
13.6
9.5
0.7
76.1
NM
Ambient
0.0
0
21.2
79.2
NM
09/21/18
Subsurface
10.8
10.8
0.1
78.3
NM
Ambient
0.0
0.1
21.8
78.1
NM
12/26/18
Subsurface
14.2
11.8
0.5
73.5
NM
MP-10R
Landfill
Ambient
0.0
0.1
20.2
79.7
NM
03/29/19
Subsurface
19.7
8.8
0.1
71.4
NM
Ambient
0.0
0.0
20.3
79.7
NM
06/26/19
Subsurface
15.5
9.3
0.1
75.2
NM
Ambient
0.0
0.0
20.2
79.7
NM
09/25/19
Subsurface
13.1
10.1
0.3
75.3
NM
Ambient
0.1
0.0
21.6
78.3
NM
03/30/20
Subsurface
18.4
6.5
3.2
71.9
NM
Ambient
0.0
0.0
20.8
79.2
NM
10/02/20
Subsurface
19.0
9.7
0.0
71.3
NM
Ambient
0.0
0.3
20.7
79.0
NM
03/22/21
Subsurface
24.7
5.8
0.3
69.2
NM
Ambient
0.0
0.1
21.3
78.6
NM
10/12/21
Subsurface
21.4
8.4
0.3
69.5
NM
Ambient
NM
NM
NM
NM
NM
04/22/22
Subsurface
27.9
NM
NM
NM
NM
Ambient
0.0
0.1
20.8
79.1
NM
10/12/22
Subsurface
25.2
8.5
0.2
66.1
0.00
Ambient
0.0
0.1
20.6
78.2
NM
04/20/23
Subsurface
24.4
5.3
1.8
68.5
NM
Ambient
0.0
0.0
20.9
79.1
NM
10/17/23
Subsurface
25.5
8.3
0
66.2
0.00
DEQ Soiid Waste Section Sceening Level
<1.25
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; NM = Not Measured
Ambient measurements were taken adjacent to MP locations immediately prior to subsurface reading.
Readings collected with a conditioned in -line charcoal filter.
Table 1 (Page 1 of 3)
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12/28/2023 Hart & Hickman, PC

Table 1 (Page 2 of 3)
Methane Probe Monitoring Results
Loftis-Blythe Construction Site
(aka Innerloop North Industrial Park)
5600 David Cox Rd
H&H Job No. HTZ-004
Carbon dioxide
Location
Methane (CH4)
Oxygen (02)
Balance
Static Pressure
Well ID
Sampling Date
Ambient/Subsurface
(CO2)
(Landfill/Perimeter)
Percent %
inches H2O
04/02/15
Ambient
0.0
0.9
21.2
78.0
NM
Subsurface
0.0
6.9
2.1
78.0
NM
11/17/15
Ambient
0.0
0.2
20.7
79.1
NM
Subsurface
2.6
11.1
0.6
83.9
NM
08/04/16
Ambient
0.0
0.2
22.1
77.7
NM
Subsurface
8.7
23.3
0.2
67.8
NM
03/08/17
Ambient
0.0
0.1
21.4
78.5
NM
Subsurface
12.4
23.1
0.8
63.4
NM
06/30/17
Ambient
0.0
0.6
20.5
78.9
NM
Subsurface
13.8
21.7
0.4
63.9
NM
09/28/17
Ambient
0.0
0.2
19.5
80.3
NM
Subsurface
13.1
24.3
0.2
62.4
NM
12/27/17
Ambient
0.0
0.2
19.9
78.7
NM
Subsurface
13.8
22.8
1.5
63.2
NM
03/23/18
Ambient
0.0
0.1
23.6
76.3
NM
Subsurface
14.5
19.2
0.3
66.0
NM
06/29/18
Ambient
0.0
0.0
20.5
79.5
NM
Subsurface
14.7
20.0
0.8
65.0
NM
09/21/18
Ambient
0.0
0.1
20.2
79.6
NM
Subsurface
12.5
22.5
0.2
64.8
NM
12/26/18
Ambient
0.0
0.1
21.7
78.2
NM
Subsurface
11.9
28.8
1.7
2.6
NM
MP-15
Perimeter
03/29/19
Ambient
0.0
0.1
20.2
79.7
NM
Subsurface
13.9
22.5
0.0
63.5
NM
06/26/19
Ambient
0.0
0.0
20.3
79.6
NM
Subsurface
12.2
21.8
0.2
65.8
NM
09/25/19
Ambient
0.0
0.0
20.2
79.7
NM
Subsurface
10.9
25.0
0.1
63.9
NM
03/30/20
Ambient
0.0
0.0
21.7
78.3
NM
Subsurface
15.5
18.9
0.1
65.5
NM
10/02/20
Ambient
0.0
0.0
20.8
79.2
NM
Subsurface
13.5
23.0
0.0
63.5
NM
03/22/21
Ambient
0.0
0.3
20.7
79.0
NM
Subsurface
16.0
17.2
0.2
66.6
NM
10/12/21
Ambient
0.0
0.0
20.8
79.0
NM
Subsurface
16.0
24.0
0.2
59.5
NM
04/22/22
Ambient
NM
NM
NM
NM
NM
Subsurface
22.5
NM
NM
NM
NM
10/12/22
Ambient
0.0
0.1
20.8
79.1
NM
Subsurface
20.7
20.1
0.1
59.1
NM
04/20/23
Ambient
0.0
0.1
20.5
78.9
NM
Subsurface
21.3
16.2
0.5
62.0
NM
10/17/23
Ambient
0.0
0.0
20.9
79.1
NM
Subsurface
19.6
21.0
0.0
59.4
0.00
04/02/15
Ambient
0.0
0.4
21.4
78.1
NM
Subsurface
31.3
16.4
0.5
51.5
NM
11/17/15
Ambient
0.0
0.1
20.9
79.0
NM
Subsurface
34.6
14.7
0.4
48.9
NM
08/04/16
Ambient
0.1
0.2
22.8
76.9
NM
Subsurface
46.0
16.0
1.2
36.8
NM
03/08/17
Ambient
0.0
0.1
20.4
79.5
NM
Subsurface
36.2
22.0
0.3
41.5
NM
06/30/17
Ambient
0.0
0.7
20.5
78.9
NM
Subsurface
36.1
17.5
1.9
44.0
NM
09/28/17
Ambient
0.0
0.3
19.4
80.3
NM
Subsurface
40.3
20.5
0.2
39.5
NM
12/27/17
Ambient
0.0
0.1
20.0
78.4
NM
Subsurface
39.5
19.5
0.4
40.8
NM
03/23/18
Ambient
0.0
0.2
22.7
77.2
NM
Subsurface
33.4
16.8
0.2
49.6
NM
06/29/18
Ambient
0.0
0.0
20.8
79.4
NM
Subsurface
33.6
17.9
0.2
48.3
NM
09/21/18
Ambient
0.0
0.0
20.9
79.0
NM
Subsurface
35.6
17.2
0.2
47.0
NM
12/26/18
Ambient
0.0
0.1
21.9
78.0
NM
Subsurface
56.7
17.4
0.5
25.5
NM
MP 16
Landfill
03/29/19
Ambient
0.0
0.1
20.3
79.4
NM
Subsurface
51.8
12.0
0.1
16.2
NM
06/26/19
Ambient
0.0
0.0
20.1
79.8
NM
Subsurface
57.8
11.9
0.1
30.2
NM
09/25/19
Ambient
0.0
0.0
20.2
79.8
NM
Subsurface
59.6
13.9
0.1
26.3
NM
03/30/20
Ambient
0.0
0.0
21.7
78.3
NM
Subsurface
66.6
9.6
0.3
23.5
NM
10/02/20
Ambient
0.0
0.0
20.8
79.2
NM
Subsurface
61.4
11.3
0.1
27.3
NM
03/22/21
Ambient
0.0
0.3
20.9
78.8
NM
Subsurface
73.5
7.9
0.1
18.5
NM
10/12/21
Ambient
0.0
0.1
21.3
78.6
NM
Subsurface
50.7
11.5
0.2
38.5
NM
04/22/22
Ambient
NM
NM
NM
NM
NM
Subsurface
46.1
NM
NM
NM
NM
10/12/22
Ambient
0.0
0.1
20.8
79.1
NM
Subsurface
47.1
11.3
0.2
41.4
0.02
04/20/23
Ambient
0.0
0.1
20.6
79.4
NM
Subsurface
50.3
8.6
0.2
40.9
NM
10/17/23
Ambient
0.0
0.0
20.9
79.1
NM
Subsurface
44.4
12.2
1 0.0
43.4
0.02
DEQ Soiid Waste Section Sceening Level
<1.25
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; NM = Not Measured
Ambient measurements were taken adjacent to MP locations immediately prior to subsurface reading.
Readings collected with a conditioned in -line charcoal filter.
Table 1 (Page 2 of 3)
https://harthick.shampoint.com/sites/MasterFiles-1/Shared Documents/AAA-Master Projects/Loftis-Blythe Brownfields site (HTZ)/Reports/2023 Annual Report/Tables/Methane point data table- 10_17_2023
12/28/2023 Hart & Hickman, PC

Table 1 (Page 3 of 3)
Methane Probe Monitoring Results
Loftis-Blythe Construction Site
(aka Innerloop North Industrial Park)
5600 David Cox Rd
H&H Job No. HTZ-004
Carbon dioxide
Location
Methane (CH4)
Oxygen (02)
Balance
Static Pressure
Well ID
Sampling Date
Ambient/Subsurface
(CO2)
(Landfill/Perimeter)
Percent %
inches H2O
04/02/15
Ambient
0.0
1.8
14.6
83.7
NM
Subsurface
0.0
0.3
21.5
78.2
NM
11/17/15
Ambient
0.0
0.1
20.8
79.2
NM
Subsurface
0.0
5.7
0.4
93.0
NM
08/04/16
Ambient
0.0
0.4
22.1
77.5
NM
Subsurface
0.4
12.2
0.1
87.3
NM
03/08/17
Ambient
0.0
0.1
19.9
80.0
NM
Subsurface
0.6
8.7
2.4
88.0
NM
06/30/17
Ambient
0.0
0.2
20.6
79.2
NM
Subsurface
0.1
10.6
0.1
89.2
NM
09/28/17
Ambient
0.0
0.5
19.8
79.8
NM
Subsurface
0.1
11.6
0.2
87.9
NM
12/27/17
Ambient
0.0
0.2
20.6
79.2
NM
Subsurface
0.2
9.3
0.4
89.9
NM
03/23/18
Ambient
0.0
0.1
22.7
77.2
NM
Subsurface
0.0
8.4
0.3
91.3
NM
06/29/18
Ambient
0.0
0.0
20.6
79.3
NM
Subsurface
0.0
9.4
0.3
90.2
NM
09/21/18
Ambient
0.0
0.3
20.2
79.1
NM
Subsurface
0.0
10.6
0.2
89.1
NM
12/26/18
Ambient
0.0
0.0
21.4
78.5
NM
Subsurface
0.1
11.7
0.8
87.5
NM
MP-17
Perimeter
03/29/19
Ambient
0.0
0.1
20.4
79.5
NM
Subsurface
0.0
9.7
0.1
90.2
NM
06/26/19
Ambient
0.0
0.0
20.2
79.8
NM
Subsurface
0.0
10.3
0.1
89.6
NM
09/25/19
Ambient
0.0
0.0
20.2
79.8
NM
Subsurface
0.0
11.8
0.2
88.0
NM
03/30/20
Ambient
0.0
0.1
21.7
78.3
NM
Subsurface
0.2
9.0
0.1
90.7
NM
10/02/20
Ambient
0.0
0.1
20.8
79.1
NM
Subsurface
0.5
11.1
0.0
88.4
NM
03/22/21
Ambient
0.0
0.1
20.9
79.0
NM
Subsurface
0.7
6.5
0.5
92.2
NM
10/12/21
Ambient
0.0
0.0
21.4
78.6
NM
Subsurface
0.6
11.8
0.5
87.0
NM
04/22/22
Ambient
NM
NM
NM
NM
NM
Subsurface
0.1
NM
NM
NM
NM
10/12/22
Ambient
0.0
0.2
19.9
79.9
NM
Subsurface
0.0
8.7
5.0
86.3
-0.09
Ambient
0.0
0.1
20.6
78.9
NM
04/20/23
Subsurface
0.1
8.6
0.4
90.9
NM
Ambient
0.0
0.1
20.9
79.0
NM
10/17/23
Subsurface
0.0
12.2
0.4
87.4
0.00
DEQ Soiid Waste Section Sceening Level
<1.25
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; NM = Not Measured
Ambient measurements were taken adjacent to MP locations immediately prior to subsurface reading.
Readings collected with a conditioned in -line charcoal filter.
Table 1 (Page 3 of 3)
https://harthick.shampoint.com/sites/MasterFiles-1/Shared Documents/AAA-Master Projects/Loftis-Blythe Brownfields site (HTZ)/Reports/2023 Annual Report/Tables/Methane point data table- 10_17_2023
12/28/2023 Hart & Hickman, PC

Table 2
Indoor Methane Monitoring Results
Loftis-Blythe Construction Site
(aka Innerloop North Industrial Park)
5600 David Cox Rd
H&H Job No. HTZ-004
Methane (CH4)
Carbon dioxide
Oxygen (Oz)
Balance
Well ID
Sampling Date
Location
(CO.)
Percent
(% )
8/4/2016
0.0
0.4
22.5
77.1
3/8/2017
0.0
0.2
21.0
78.8
6/30/2017
0.0
0.2
20.6
79.1
9/28/2017
0.0
0.2
19.7
80.1
12/27/2017
0.0
0.4
19.9
78.5
3/23/2018
0.0
0.1
23.0
76.9
6/29/2018
0.0
0.1
20.9
79.0
9/21/2018
0.0
0.1
20.9
79.0
12/26/2018
0.0
0.1
21.7
78.1
AMB-1
3/29/2019
Building 1
0.0
0.2
20.7
79.1
6/26/2019
0.0
0.1
20.3
79.6
9/25/2019
0.0
0.1
20.2
79.7
3/30/2020
0.0
0.0
20.8
79.2
10/2/2020
0.0
0.1
20.7
79.2
3/22/2021
0.0
0.1
21.5
78.4
10/12/2021
0.0
0.0
21.5
78.4
4/22/2022
0.0
NM
NM
NM
10/12/2022
0.0
0.2
20.8
79.0
4/20/2023
0.0
0.1
20.1
79.8
10/17/2023
0.0
0.1
20.9
79.0
8/4/2016
0.0
0.1
22.8
77.1
3/8/2017
0.0
0.1
21.1
78.8
6/30/2017
0.0
0.2
20.8
79.1
9/28/2017
0.0
0.2
19.6
80.2
12/27/2017
0.0
0.3
19.9
78.6
3/23/2018
0.0
0.1
22.8
77.1
6/29/2018
0.0
0.0
21.0
79.0
9/21/2018
0.0
0.0
20.8
79.1
12/26/2018
0.0
0.0
21.8
78.2
AMB 2
3/29/2019
Building 1
0.0
0.2
20.6
79.2
6/26/2019
0.0
0.0
20.3
79.6
9/25/2019
0.0
0.0
20.2
79.8
3/30/2020
0.0
0.0
20.8
79.2
10/2/2020
0.0
0.1
20.7
79.2
3/22/2021
0.0
0.1
21.6
78.3
10/12/2021
0.0
0.0
21.4
78.4
4/22/2022
0.0
NM
NM
NM
10/12/2022
0.0
0.1
21.0
78.9
4/20/2023
0.0
0.0
20.3
79.6
10/17/2023
0.0
0.0
20.9
79.1
8/4/2016
0.0
0.1
22.8
77.1
3/8/2017
0.0
0.1
21.1
78.8
6/30/2017
0.0
0.2
20.7
79.1
9/28/2017
0.0
0.2
19.9
79.9
12/27/2017
0.0
0.2
20.0
78.8
3/23/2018
0.0
0.1
22.7
77.2
6/29/2018
0.0
0.0
21.1
78.9
9/21/2018
0.0
0.0
20.6
79.3
12/26/2018
0.0
0.0
21.9
78.1
AMB-3
3/29/2019
Building 1
0.0
0.3
20.5
79.3
6/26/2019
0.0
0.0
20.4
79.5
9/25/2019
0.0
0.0
20.2
79.0
3/30/2020
0.0
0.0
20.7
79.3
10/2/2020
0.0
0.1
20.7
79.2
3/22/2021
0.0
0.1
21.4
78.5
10/12/2021
0.0
0.0
20.8
79.2
4/22/2022
0.0
NM
NM
NM
10/12/2022
0.0
0.1
21.4
78.5
4/20/2023
0.0
0.1
21.0
79.0
10/17/2023
0.0
0.1
20.9
79.0
8/4/2016
0.0
0.1
22.7
77.2
3/8/2017
0.0
0.1
21.1
78.8
6/30/2017
0.0
0.2
20.9
78.9
9/28/2017
0.0
0.2
19.7
80.1
12/27/2017
0.0
0.3
19.8
78.7
3/23/2018
0.0
0.1
22.8
77.0
6/29/2018
0.0
0.0
21.0
79.0
9/21/2018
0.0
0.1
20.8
79.1
12/26/2018
0.0
0.1
21.7
78.2
AMB-4
3/29/2019
Building 1
0.0
0.1
20.2
79.7
6/26/2019
0.0
0.1
20.3
79.7
9/25/2019
0.0
0.0
70.3
79.7
3/30/2020
0.0
0.0
20.6
79.4
10/2/2020
0.0
0.1
20.7
79.2
3/22/2021
0.0
0.1
21.6
78.3
10/12/2021
0.0
0.0
21.0
79.0
4/22/2022
0.0
NM
NM
NM
10/12/2022
0.0
0.1
21.1
78.8
4/20/2023
0.0
0.1
20.6
79.3
10/17/2023
0.0
0.0
20.9
79.1
DEQ Soild Waste Section Sceening Level
<1.25
Notes.
Screening level based upon DEQ Solid Waste Section regulations for facility structures of 25% LEL (1.25% methane).
Ambient measurements were taken at breathing zone level from ground.
AMB = Ambient Air; NM = Not Measured
NA = Building not accessible at time of event
Readings collected with a conditioned in -line charcoal filter.
Table 2
nnpsimann ck.enarepoin�comisi�esrtnsarerr'aes-iisnaree o«umme�n44-Mauer a miecni­BiNhe Brw 1de see(HTZNRepo1s 3-.1 Reponrtabi­hane poim a am 1- 10 i�laza
„aano:a - Hart & Hickman, PC

Table 2
Indoor Methane Monitoring Results
Loftis-Blythe Construction Site
(aka Innerloop North Industrial Park)
5600 David Cox Rd
H&H Job No. HTZ-004
Methane (CH4)
Carbon dioxide
Oxygen (Oz)
Balance
Well ID
Sampling Date
Location
(COO
Percent
(% )
8/4/2016
0.0
0.1
23.0
76.9
3/8/2017
0.0
0.1
21.3
78.6
6/30/2017
0.0
0.3
20.7
79.0
9/28/2017
0.0
0.2
19.9
79.9
12/27/2017
0.0
0.2
19.9
78.1
3/23/2018
0.0
0.1
22.6
77.3
6/29/2018
0.0
0.1
20.5
79.4
9/21/2018
0.0
0.1
20.9
79.0
12/26/2018
0.0
0.0
21.9
78.0
3/29/2019
0.0
0.1
20.3
79.6
AMB-5
6/26/2019
Building 2
0.0
0.1
20.5
79.4
9/25/2019
0.0
0.0
20.2
79.8
3/30/2020
NA
NA
NA
NA
10/2/2020
0.0
0.1
20.5
79.4
3/22/2021
0.0
0.1
21.6
78.3
10/12/2021
0.0
0.0
21.9
78.0
4/22/2022
0.0
NM
NM
NM
10/12/2022
0.0
0.2
21.3
78.5
4/20/2023
0.0
0.1
20.7
79.2
10/17/2023
0.0
0.0
20.9
79.1
8/4/2016
0.0
0.1
22.9
77.0
3/8/2017
0.0
0.1
21.3
78.6
6/30/2017
0.0
0.2
20.8
79.0
9/28/2017
0.0
0.2
19.9
79.9
12/27/2017
0.0
0.2
19.9
78.1
3/23/2018
0.0
0.1
22.6
77.3
6/29/2018
0.0
0.0
20.5
79.4
9/21/2018
0.0
0.1
20.9
79.0
12/26/2018
0.0
0.0
21.9
78.0
3/29/2019
0.0
0.1
20.5
79.4
AMB-6
6/26/2019
Building 2
0.0
0.0
20.5
79.5
9/25/2019
0.0
0.0
20.2
79.8
3/30/2020
NA
NA
NA
NA
10/2/2020
0.0
0.1
20.6
79.3
3/22/2021
0.0
0.1
21.5
78.4
10/12/2021
0.0
0.0
20.5
79.4
4/22/2022
0.0
NM
NM
NM
10/12/2022
0.0
0.1
21.3
78.6
4/20/2023
0.0
0.1
20.9
79.0
10/17/2023
0.0
0.1
20.9
79.0
8/4/2016
0.0
0.1
23.1
76.8
3/8/2017
0.0
0.1
21.2
78.7
6/30/2017
0.0
0.2
20.8
79.0
9/28/2017
0.0
0.2
20.0
79.9
12/27/2017
0.0
0.3
19.8
78.0
3/23/2018
0.0
0.1
22.6
77.3
6/29/2018
0.0
0.1
20.8
79.1
9/21/2018
0.0
0.1
20.6
79.3
12/26/2018
0.0
0.1
21.8
78.1
3/29/2019
0.0
0.2
20.6
79.3
AMB-7
6/26/2019
Building 2
0.0
0.1
20.4
79.5
9/25/2019
0.0
0.0
20.2
79.8
3/30/2020
0.0
0.0
20.7
79.3
10/2/2020
0.0
0.1
20.8
79.2
3/22/2021
0.0
0.1
21.4
78.5
10/12/2021
0.0
0.0
20.7
79.3
4/22/2022
0.0
NM
NM
NM
10/12/2022
0.0
0.1
21.5
78.4
4/20/2023
0.0
0.1
21.0
78.9
10/17/2023
0.0
0.0
20.9
79.1
8/4/2016
0.0
0.1
23.2
76.7
3/8/2017
0.0
0.1
21.3
78.6
6/30/2017
0.0
0.2
20.9
78.9
9/28/2017
0.0
0.1
20.0
79.9
12/27/2017
0.0
0.2
19.9
78.1
3/23/2018
0.0
0.1
22.6
77.3
6/29/2018
0.0
0.0
20.8
79.2
9/21/2018
0.0
0.0
20.6
79.3
12/26/2018
0.0
0.0
22.0
78.0
3/29/2019
0.0
0.1
20.7
79.2
AMB-8
6/26/2019
Building 2
0.0
0.0
20.4
79.6
9/25/2019
0.0
0.0
20.2
79.8
3/30/2020
0.0
0.1
20.6
79.3
10/2/2020
0.0
0.1
20.7
79.2
3/22/2021
0.0
0.1
21.4
78.5
10/12/2021
0.0
0.1
20.6
79.3
4/22/2022
0.0
NM
NM
NM
10/12/2022
0.0
0.1
21.4
78.5
4/20/2023
0.0
0.1
21.1
78.9
10/17/2023
0.0
0.1
20.9
79.0
DEQ Solid Waste Section Sceening Level
<1.25
Notes:
Screening level based upon DEQ Solid Waste Section regulations for facility structures of 25% LEL (1.25% methane).
Ambient measurements were taken at breathing one level from ground.
AMB = Ambient Air; NM = Not Measured
NA = Building not accessible at time of event
Readings collected with a conditioned in -line charcoal filter.
Table 2
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,vzeno:3 - Hart & Hickman, PC

Table 3
Manhole & Trench Methane Monitoring Results
Loftis-Blythe Construction Site
(aka Innerloop North Industrial Park)
5600 David Cox Rd
H&H Job No. HTZ-004
Methane (CH4)
Carbon dioxide
Oxygen (Oz)
Balance
Well ID
Sampling Date
Ambient/Subsurface
(C%)
Percent (% )
Ambient
0.0
0.1
20.6
79.3
06/30/17
Subsurface
0.0
0.1
20.4
79.5
Ambient
0.0
0.1
19.6
80.3
09/28/17
Subsurface
0.0
0.1
19.7
80.2
Ambient
0.0
0.2
19.8
78.6
12/27/17
Subsurface
0.0
0.2
19.9
78.6
Ambient
0.0
0.1
19.6
80.3
03/23/18
Subsurface
0.0
0.1
19.7
80.2
Ambient
0.0
0.0
20.3
79.6
06/29/18
Subsurface
0.0
0.1
20.2
79.7
Ambient
0.0
0.0
20.3
79.5
09/21/18
Subsurface
0.0
0.1
20.2
79.5
Ambient
0.0
0.0
22.1
77.8
12/26/18
Subsurface
0.0
0.1
22.2
77.8
Ambient
0.0
0.1
20.6
79.4
03/29/19
Subsurface
0.0
0.0
20.4
79.6
Ambient
0.0
0.0
20.1
79.8
Manhole-1
06/26/19
Subsurface
0.0
0.0
20.1
79.8
Ambient
0.0
0.1
20.2
79.7
09/25/19
Subsurface
0.0
0.1
20.2
79.7
Ambient
0.0
0.0
21.1
78.9
03/30/20
Subsurface
0.0
0.0
21.1
78.9
Ambient
0.0
0.0
20.7
79.3
10/02/20
Subsurface
0.0
0.5
20.6
78.9
Ambient
0.0
0.2
20.9
78.9
03/22/21
Subsurface
0.0
0.2
20.5
79.3
Ambient
0.0
0.0
20.7
79.3
10/12/21
Subsurface
0.0
0.0
20.7
79.3
Ambient
NM
NM
NM
NM
04/22/22
Subsurface
0.0
NM
NM
NM
Ambient
NM
NM
NM
NM
10/12/22
Subsurface
0.0
0.3
21.2
78.5
Ambient
0.0
0.1
20.9
79.2
04/20/23
Subsurface
0.0
0.1
20.9
1 79.1
Ambient
0.0
0.1
20.9
79.0
10/17/23
Subsurface
0.0
0.1
20.8
79.1
Ambient
0.0
0.1
20.2
79.7
06/30/17
Subsurface
0.0
0.1
20.0
79.9
Ambient
0.0
0.1
19.8
80.1
09/28/17
Subsurface
0.1
0.1
20.0
79.8
Ambient
0.0
0.1
20.0
78.4
12/27/17
Subsurface
0.0
0.2
19.9
78.5
Ambient
0.0
0.1
19.8
80.1
03/23/18
Subsurface
0.0
0.1
20.0
1 79.9
Ambient
0.0
0.1
20.3
79.6
06/29/18
Subsurface
0.0
0.0
20.3
79.5
Ambient
0.0
0.1
20.2
79.6
09/21/18
Subsurface
0.0
0.1
20.1
79.5
Ambient
0.0
0.0
22.1
77.8
12/26/18
Subsurface
0.0
0.1
22.1
77.9
Ambient
0.0
0.1
20.6
79.3
03/29/19
Subsurface
0.0
0.1
20.5
79.4
Ambient
0.0
0.0
20.2
79.8
Manhole-2
06/26/19
Subsurface
0.0
0.0
20.2
1 79.8
Ambient
0.0
0.1
20.2
79.7
09/25/19
Subsurface
0.0
0.1
20.2
79.7
Ambient
0.0
0.0
19.9
80.1
03/30/20
Subsurface
0.0
0.0
19.9
80.1
Ambient
0.0
0.0
20.9
79.1
10/02/20
Subsurface
0.0
0.2
20.5
79.4
Ambient
0.0
0.0
22.6
77.3
03/22/21
Subsurface
0.0
0.1
22.6
77.4
Ambient
0.0
0.0
20.2
79.8
10/12/21
Subsurface
0.0
0.0
20.2
1 79.8
Ambient
NM
NM
NM
NM
04/22/22
Subsurface
0.0
NM
NM
NM
Ambient
NM
NM
NM
NM
10/12/22
Subsurface
0.0
0.3
21.2
78.5
Ambient
0.0
0.1
20.6
79.4
04/20/23
Subsurface
0.0
0.1
20.5
79.5
Ambient
0.0
0.0
20.9
79.1
10/17/23
Subsurface
0.0
0.1
20.8
79.2
DEQ Soild Waste Section Sceening Level
<1.25
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).
Ambient Measurements were taken adjacent to manhole/trench locations immediatley prior to subsurface reading.
NM = Not Measured
Readings collected with a conditioned in -line charcoal filter.
Table 3
M1Xps:IRmMid.sM1arepolnt.coMSXes�MaMeFllesl/3M1aretl OocumeMs/AFH-Masser RrojecwWllls-BIyUe BrowMeltls sXe (HTryReporIL2023 Mnual Report/rableslMeMane point tlaU sable-10_i T_2023
lvzarzoz3 Hart & Hickman, PC

Table 3
Manhole & Trench Methane Monitoring Results
Louis -Blythe Construction Site
(aka Innerloop North Industrial Park)
5600 David Cox Rd
H&H Job No. HTZ-004
Methane (CH4)
Carbon dioxide
Oxygen (02)
Balance
Well ID
Sampling Date
Ambient/Subsurface
(C%)
Percent (% )
06/30/17
Ambient
0.0
0.1
20.0
79.9
Subsurface
0.0
0.2
20.0
79.8
09/28/17
Ambient
0.1
0.1
20.1
79.7
Subsurface
0.1
0.1
20.2
79.6
12/27/17
Ambient
0.0
0.1
20.0
78.3
Subsurface
0.0
0.2
19.9
78.2
03/23/18
Ambient
0.0
0.1
19.8
80.1
Subsurface
0.0
0.1
20.0
79.8
06/29/18
Ambient
0.0
0.0
20.4
79.5
Subsurface
0.0
0.1
20.3
79.6
09/21/18
Ambient
0.0
0.1
20.2
79.5
Subsurface
0.0
0.1
20.1
79.5
12/26/18
Ambient
0.0
0.0
22.1
77.8
Subsurface
0.0
0.0
22.1
77.9
03/29/19
Ambient
0.0
0.1
20.7
79.2
Subsurface
0.0
0.1
20.6
79.4
06/26/19
Ambient
0.0
0.1
20.2
79.8
Manhole-3
Subsurface
0.0
0.1
20.2
79.8
09/25/19
Ambient
0.0
0.1
20.2
79.7
Subsurface
0.0
0.1
20.2
79.7
03/30/20
Ambient
0.0
0.0
20.0
80.0
Subsurface
0.0
0.0
20.0
80.0
10/02/20
Ambient
0.0
0.0
20.8
79.2
Subsurface
0.0
0.1
20.7
79.2
03/22/21
Ambient
0.0
0.1
22.5
77.5
Subsurface
0.0
0.1
22.4
77.5
10/12/21
Ambient
0.0
0.0
22.1
77.8
Subsurface
0.0
0.0
22.1
77.9
04/22/22
Ambient
NM
NM
NM
NM
Subsurface
0.0
NM
NM
NM
10/12/22
Ambient
NM
NM
NM
NM
Subsurface
0.3
0.3
21.1
78.3
04/20/23
Ambient
0.0
0.1
20.2
79.8
Subsurface
0.0
0.1
20.2
79.8
10/17/23
Ambient
0.0
0.0
20.9
79.1
Subsurface
0.0
0.1
20.8
79.2
06/30/17
Ambient
0.0
0.2
20.8
79.0
Subsurface
0.0
0.1
20.8
79.0
09/28/17
Ambient
0.0
0.2
19.3
80.5
Subsurface
0.0
0.2
19.4
80.5
12/27/17
Ambient
0.0
0.2
19.8
77.9
Subsurface
0.0
0.1
20.0
78.2
03/23/18
Ambient
0.0
0.1
19.6
80.3
Subsurface
0.0
0.1
19.7
80.2
06/29/18
Ambient
0.0
0.1
20.4
79.5
Subsurface
0.0
0.0
20.4
79.5
09/21/18
Ambient
0.0
0.0
20.1
79.4
Subsurface
0.0
0.0
20.1
79.4
12/26/18
Ambient
0.0
0.0
21.9
78.0
Subsurface
0.0
0.0
22.1
77.8
03/29/19
Ambient
0.0
0.1
20.6
79.3
Subsurface
0.0
0.1
20.7
79.3
06/26/19
Ambient
0.0
0.1
20.1
79.8
Trench
Subsurface
0.0
0.1
20.1
79.8
09/25/19
Ambient
0.0
0.1
20.2
79.7
Subsurface
0.0
0.1
20.2
79.7
03/30/20
Ambient
0.0
0.0
19.8
80.2
Subsurface
0.0
0.0
19.8
80.2
10/02/20
Ambient
0.0
0.0
20.9
79.1
Subsurface
0.0
0.0
20.9
79.1
03/22/21
Ambient
0.0
0.7
20.7
78.6
Subsurface
0.0
0.3
20.9
78.9
10/12/21
Ambient
0.0
0.1
20.1
79.8
Subsurface
0.0
0.1
20.1
79.8
04/22/22
Ambient
NM
NM
NM
NM
Subsurface
0.0
NM
NM
NM
10/12/22
Ambient
NM
NM
NM
NM
Subsurface
0.0
0.1
21.5
78.4
04/20/23
Ambient
0.0
0.2
21.1
78.6
Subsurface
0.0
0.1
1 21.2
78.8
10/17/23
Ambient
0.0
0.0
20.9
79.1
Subsurface
0.0
0.1
20.8
79.1
DEQ Sold Waste Section Sceenin Level
<1.25
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).
Ambient Measurements were taken adjacent to manhole/trench locations immediatley prior to subsurface reading.
NM = Not Measured
Readings collected with a conditioned in -line charcoal filter.
Table 3
M1Xps:IRmMid.sM1arepolnt.coMSXes�MaMeFllesl/3M1aretl OocumeMs/AFH-Masser RrojecwWllls-BIyUe BrowMeltls sXe (HTryReporIL2023 Mnual Report/rableslMeMane point tlaU sable-10_i T_2023
lvzarzoz3 Hart & Hickman, PC

Figures
10
https://harthick.shmepoint.com/sites/MwtfFiles-1/Shared Documents/AAA-Master Projects/Loftis-Blythe Brownfields site
(HTZ)/Reports/2023 Annual Report/Report/2023 Annual Methane Monitoring Report-DRAFT.doc
hart hickman
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APPROXIMATE LOCATION OF
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NOTES:
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MANHOLE-2 04/22/2210/12/22 4/20/23 10/17/23
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♦
MANHOLE-2
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LEGEND
SITE PROPERTY BOUNDARY
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SANITARY SEWER MANHOLE
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METHANE PROBE ID SAMPLE DATE
MANHOLE-2 10/17/23
METHANE 0.0
CONSTITUENT CONCENTRATION %
NOTES:
1. ONLY 2022 AND 2023 READINGS SHOWN
ON FIGURE. REFER TO TABLE 3 FOR
PRIOR READINGS.
8
APPROXIMATE
0 50 100
SCALE Immmw
N FEET
LE
MANHOLE & TRENCH SAMPLE LOCATION MAP
---_ LOFTIS-BLYTHE CONSTRUCTION SITE
5600 DAVID COX ROAD
CHARLOTTE, NORTH CAROLINA
• 2923 South Tryon Street -Suite 100
hart h i c k m a n Charlotte, North Carolina 28203
704-586-0007(p)704-586-0373(f
SMARTER ENVIRONMENTAL SOLUTIONS License # C-1269 / #C-245 Geology
DATE: 10-27-23 REVISION NO. 0
JOB NO. HTZ-004 FIGURE NO. 4

Appendix A
Equipment Calibration Documents

CALIBRATION
LOG
�J
LANDTEC - GEM 5000+
ES # 1255
Instrument: LAN
Calibrated materials required:
METHANE Lot: 304-402130279-1
OXYGEN Lot:
304-402396492-1
HIGH Exp: 6/7/2025
LOW Exp:
4/20/2026
METHANE Lot: 304-402342276-1
CARBON Lot:
22-8620
LOW Exp: 2/2/2026
MONOXIDE Exp:
3/1/2027
OXYGEN Lot: 23-9496
HYDROGEN Lot:
304-402396488-1
HIGH Exp: 3/l/2027
SULFIDE Exp:
10/20/2024
Carbon Filter Saturation (CH4) - Condition: PASS
Gas Calibration Check Performed at Room Temperature
GEM 5000+ M1BRA
SENSOR
Initial Reading
CAL Reading
Tolerance
Comments
CH4 (%)
0.0
0.0
+/- 0.5%
CO (ppm)
0.0
0.0
+/- 5 ppm
1-12S (ppm)
0.0
0.0
+/- 5 ppm
H2 (%)
0.0
0.0
+/- 1.5%
rETTMLE
HI ALIBRA
SENSOR
Initial Reading
CAL Reading
Tolerance
Comments
H o)
47.3
5
+ - .5 0
o
+- 1.5%
02 %
1.6
0.0
+ - 1.5%
METHANE LOW CALIB7 RA
NSOR
7s02(%)
Initial Reading
CAL Reading
Tolerance
Comments
o
10.5
1
0 +- .5
+/-o
0 2 (%)
1.4
0.0
+/- 1.5%
OXYGEN HIGH CALIBRATION
SENSOR
Initial Reading
CAL Reading
Tolerance
Comments
02 (%)
21.7
20.9
+/- 0.5%
LOW RA
SENSOR
Initial Reading
CAL Reading
Tolerance
Comments
02 (%)
6.0
4.0
+/- 0.5%
CARBON MON B
SENSOR
Initial Reading
CAL Reading
Tolerance
Comments
CO (ppm)
1026
1000
+/- 50 ppm
HYDROGEN SULFIDE CALIBRATION
SENSOR
Initial Reading
CAL Reading
Tolerance
Comments
H2S (ppm)
198
200
+/- 10 ppm
Signature: fz Date: 10/16/2023

�ERTI FICATION VQOF CALIBRATION >E I Dy
No. 66916
Date Of Calibration: 28-Apr-2023 Certificate Number: G502512-9/46129
.Issued by: QED Environmental Systems Inc.
Customer: EASTERN SOLUTIONS LLC
10909 ROZZELLES FERRY Ra CHARLOTTE, NC 28214 US
Description., Landtec Gas Analyzer
Model. GEM5000
Serial Number: G502512
Accredited Results:
Methane fCH41
Certified Gas %
Instrument Reading %
Uncertain %
5.0
5.0
0.42
15.0
15.1
0.66
50.0
50.3
1.03
Carbon Dioxide CO2
---....._. Certified Gas X :....-:_ :u:=._-:-
u Instrument ReadinK 96
Uncertai %
5.0
5:1
043
15.1
15.2
0.71
50.0
50.3
1.19
en U2
.Certified Gas % = -=: _-'= = .=
Instrument Reading %
Uncertain 9G
20.9
21.0
0.25
Gas cylinders are traceable and details can be provided if
requested.
CH4, COZ readings recorded at: 27.4 `C/81.4 °F Barometric Pressure: 0974"Hg/28.75 "Hg
02 readings recorded at: 21.2-C/70.2 "F
Method of Test: The analyzer is calibrated in a temperature controlled chamber using a series of reference
gases, in compliance with procedure ISP17.
The reported expanded uncertainty is based on a standard uncertainty multiplied by a coverage factor of k=2,
providing a level of confidence of approximately 95%. The uncertainty evaluation has been carried out in accordance
with N1STrequirements.
The calibration results published in this certificate were obtained using equipment capable of producing results that are traceable through MIST to the International system of
Units (51). Certification only applies to results shown. This certlflcate may not be reproduced other than in full, except with the prior written approval of the issuing laboratory.
Cnitbratmn Toostau 116 1GC Insta 116 Page 1 of2 j IM15fNANET--IA
www.gedenv.com [phone] [e-mail]
QED Environmental Systems Inc. 2355 Bishop Circle West, Dexter, M:l 48130

-CERTIFICATION
0F' CALIBRATION �� op
No. 66916
Date of Calibration: 28-Apr-2023
IssuE,td by: QED Environmental Systems Inc.
Norr Accredited results:
IQ�n�
Certificate Number: G502512_9/46129
Pressure Transducers inches of water column
;Transducer Certified (Low) heading (low) Certified (High) Reading (High) Accuraeq
Static
0"
0"
40"
1 40.01" 2.0"
Differential
Oil
Oil4'r
1 3.92" 0.7"
Barometer mbar
Reference
Instrument Reading
0974 mbar / 28.75 "Hg
0973 mbar 28.72 "Fig
As received gas check readings:
Methane CH4
Certified Gas %
Instrument Reading %
5.❑
5.2
15.0
15.8
50.0
48.2
Carbon Dioxide CO2
5.0
5.5
15.1
16.3
50.0
51.8
= Crx n 02
------ Certified Gas 9b Instrument Reading %
20.9 20.9
As received Gas readings recorded at: 27.4 °C/81.4 `F
As received Barometric Pressure recorded at: 21.2 "C/70.2 `F
Date of Issue : 01 May 2023 Approved By Signatory
G raig McPherson
Laboratory lnsp-1 ion
The calil7ratton results published in this certificate were obtained using equipment capable of producing results that are traceable through MST to the Intemational System of
Units (SE). Certification only applies to results shown. This certificate may not be reproduced other than in full, except with the prior written approval of the issuing laboratory.
Calibramon Ins�nce:115 IGC Iustauofn I Efi
Page 2 of21 LP[IlSLNAhiLST-1,1
www.:gedenv.com [phone] [e-mail]
QED Environmental Systems Inc. 2.355 Bishop Circle West, Dexter, Mt 48130

'I RUST Ea 9RpYEH 4UAEkn'
CERTIFICATE OF CONFORMANCE
Issued BY: QED Environmental Systems Inc. Services Facility
Date of Calibration: 2023-04-19 .
Certificate Number: 91-11846 2-3RA-55104_20230419 ❑1.pdf
Customer Name. EASTERN SOLUTIONS LLC
10909 RCZZELLES FERRY R❑
CHARLOTTE, NC 28214
u5
Description:
Model:
Serial Number:
Temp Probe
5 K-TP
01-11846
Test Criteria:
±5°F @ 4WF
Temperature Reading Recoded At:
40.1'F
Test Criteria:
±5°F @ 160'F
Temperature Reading Recoded At:
160..4°F
Test Criteria:
--t51F @ 212OF
Temperature Reading Recoded At:
21L6*F
Calibration Pass: Reported readings are within the manufacturer's specifications.
service@c}edenv. corn
http,//www.qedenv.com
QED Environmental Systems, Inc.
800-624-20261734-995-2547 x 575 1 Fax [phone]
QED Environmental Systems Inc, 1100.b24.2t1-
2355 Bishop Circle West Dexter, MI 48130,USA 0 LNN WQEDEWCOM � 73�i_995.25e'