16055-Loftis-Blythe-2018 Annual Methane Monitoring Report

2018 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-001
February 8, 2019
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2018 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
Table of Contents
Section Page No.
1.0 Introduction ................................................................................................................ 1
2.0 Background ................................................................................................................ 2
3.0 Quarterly Methane Monitoring, Alarms, and Annual System Testing ................ 5
3.1 Quarterly Methane Monitoring Results ................................................................... 5 3.2 Methane Warning System Alarm and Inspection .................................................... 6 4.0 Summary and Conclusions ........................................................................................ 8

List of Tables
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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2018 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
quarterly methane monitoring and annual 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 quarterly methane monitoring events were conducted in March 2018,
June 2018, September 2018, and December 2018 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. The annual inspection and testing of the methane warning
system installed in the western portion of Building 2 was conducted on October 12, 2018. The
western portion of Building 2 has been vacant since December 2017.

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 2018 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. 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-10R, 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-10R 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.

During 2017, 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
addition, during the December 2017 quarterly methane monitoring event, inspection and testing
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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. JD
Generators has moved out and the western portion of Building 2 is currently vacant.

Additionally, the current landowner 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 are 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 Quarterly Methane Monitoring, Alarms, and Annual System Testing
In accordance with the approved Design Plan, H&H conducted quarterly monitoring of methane
probes MP-10R, MP-15, MP-16, and MP-17 in 2018, and 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. During each quarterly visit, the
sanitary sewer manholes north of Building 2 and the drainage trench south of Building 2 were
also screened for methane. Locations of the sewer manholes and drainage trench are shown on
Figure 4. In addition, 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.
Quarterly monitoring events were conducted on March 23, 2018, June 29, 2018, September 21,
2018, and December 26, 2018. 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 October 12, 2018
after an alarm notice from the warning system as discussed in Section 3.2. 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 Quarterly Methane Monitoring Results

The results of methane monitoring conducted in March, June, September, and December 2018
indicated the presence of methane in MP-16 (ranging from 33.4% to 56.7%), MP-10R (ranging
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from 10.8% to 16.6%), and MP-15 (ranging from 11.9% to 14.7%) above the most conservative
methane screening level of 1.25% during each of the quarterly monitoring events. Methane was
also detected in MP-17 (0.1%) during the December 2018 monitoring event, but the
concentration detected was below the most conservative methane screening level of 1.25%.
Methane was not detected (0.0%) in MP-17 during the other 2018 quarterly sampling 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 quarterly
methane monitoring events. In addition, methane was not detected in the sanitary sewer
manholes or trench drain during the quarterly methane sampling 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 manhole and trench
methane monitoring conducted at the site are summarized in Table 3 and depicted on Figure 4.

As part of the quarterly methane monitoring activities in 2018, 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 Alarm and Inspection

On October 12, 2018, H&H was notified of an alarm from the methane warning system. H&H
mobilized to site and conducted methane screening in the western portion of Building 2 utilizing
the Landtec GEM 5000. The result of the screening did not indicate the presence of methane.
Following correspondence with the alarm company, it was determined that the alarm was likely
triggered as a result of a power outage and the methane alarm was reset.

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Following the methane warning system reset, the methane warning system was inspected by
H&H in accordance with the Design Plan. The inspection included observing the alarm system
panel for faults, testing a representative number of methane sensors, and ensuring that the green
“armed” light was illuminated on each of the sensors. The result of the inspection and testing
indicated that the methane warning system was functional and operated normally.

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4.0 Summary and Conclusions
The results of the 2018 quarterly methane probe 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 quarterly 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, although methane levels in the probes are stable.

H&H responded to a methane warning system alarm on October 12, 2018, but it was determined
that the alarm was likely activated due to a power outage. In addition, H&H confirmed that
methane was not present in the building. During the October 12, 2018 visit, H&H also
conducted a methane warning system inspection in accordance with the approved Design Plan.
The inspection included observing the alarm system panel for faults, testing a representative
number of methane sensors, and ensuring that the green “armed” light was illuminated on each
of the sensors. The result of the inspection and testing indicated that the methane warning
system was functional and operated normally.

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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 reducing the quarterly methane monitoring to a semi-annual monitoring
basis beginning in 2019. It is anticipated that the semi-annual methane monitoring will be
conducted in April and August of each year. The August semi-annual methane monitoring event
will also include the annual system testing and inspection. Following the August 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.

TABLES
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-001
Ambient 0.1 0.0 20.5 79.2
Subsurface 0.2 1.7 18.9 79.0
Ambient 0.0 0.0 20.6 79.1
Subsurface 0.2 0.2 20.5 79.2
Ambient 0.1 0.0 20.6 79.1
Subsurface 0.1 5.8 13.5 80.4
Ambient 0.1 0.0 20.6 79.1
Subsurface 0.1 2.2 17.1 80.3
Ambient 0.1 0.0 20.5 79.1
Subsurface 0.1 1.1 19.4 79.3
Ambient 0.1 0.1 20.5 79.3
Subsurface 0.1 1.5 19.5 79.2
Ambient 0.1 0.0 20.6 79.2
Subsurface 1.6 6.9 11.2 80.1
Ambient 0.1 0.1 20.5 79.1
Subsurface 0.2 2.3 18.0 79.4
Ambient 0.1 0.2 20.4 79.2
Subsurface 0.1 3.6 18.3 77.9
Ambient 0.1 0.0 20.6 79.1
Subsurface 0.2 2.1 18.3 79.3
Ambient 0.1 0.0 20.5 79.3
Subsurface 0.1 1.2 18.1 80.4Ambient 0.0 0.6 21.4 78.0Subsurface0.0 6.8 2.8 90.0
Ambient 0.0 0.1 20.9 78.8Subsurface4.2 9.7 0.2 85.0
Ambient 0.1 0.8 22.1 77.0Subsurface11.6 13.1 0.9 74.4
Ambient 0.0 0.1 20.8 79.1Subsurface16.0 10.8 0.5 72.6
Ambient 0.0 0.2 20.5 79.3Subsurface14.9 11.2 0.9 73.0
Ambient 0.0 0.2 19.8 80.0Subsurface13.5 12.7 0.7 73.1
Ambient 0.0 0.3 20.1 77.8Subsurface15.5 11.5 0.0 73.0
Ambient 0.0 0.1 22.7 77.2Subsurface16.6 8.7 0.1 74.7
Ambient 0 0 20.5 79.4Subsurface13.6 9.5 0.7 76.1
Ambient 0.0 0 21.2 79.2Subsurface10.8 10.8 0.1 78.3
Ambient 0.0 0.1 21.8 78.1Subsurface14.2 11.8 0.5 73.5
Ambient 0.0 0.9 21.2 78.0
Subsurface 0.0 6.9 2.1 78.0
Ambient 0.0 0.2 20.7 79.1
Subsurface 2.6 11.1 0.6 83.9
Ambient 0.0 0.2 22.1 77.7
Subsurface 8.7 23.3 0.2 67.8
Ambient 0.0 0.1 21.4 78.5Subsurface12.4 23.1 0.8 63.4
Ambient 0.0 0.6 20.5 78.9Subsurface13.8 21.7 0.4 63.9
Ambient 0.0 0.2 19.5 80.3Subsurface13.1 24.3 0.2 62.4
Ambient 0.0 0.2 19.9 78.7Subsurface13.8 22.8 1.5 63.2
Ambient 0.0 0.1 23.6 76.3Subsurface14.5 19.2 0.3 66.0
Ambient 0.0 0.0 20.5 79.5Subsurface14.7 20.0 0.8 65.0
Ambient 0.0 0.1 20.2 79.6Subsurface12.5 22.5 0.2 64.8
Ambient 0.0 0.1 21.7 78.2Subsurface11.9 28.8 1.7 57.5
Perimeter
MP-10R
12/26/18
Landfill
04/02/15
11/17/15
08/04/16
03/23/18
06/29/18
06/29/18
03/23/18
09/21/18
12/27/17
09/21/18
09/28/17
09/28/17
Landfill
MP-14 07/17/13 Perimeter
04/02/15
Landfill
MP-11 07/17/13 Perimeter
MP-12 07/17/13 Perimeter BalancePercent (%)
MP-1 07/17/13 Landfill
Sampling
Date Ambient/Subsurface Location
(Landfill/Perimeter)Methane (CH4)Carbon dioxide (CO₂)Oxygen (O2)Landfill
MP-8 07/17/13 Perimeter
Well ID
MP-2 07/17/13 Perimeter
MP-6 07/17/13 Landfill
06/30/17
MP-9 07/17/13
MP-10 07/17/13
MP-13 07/17/13
11/17/15
MP-15
12/26/18
03/08/17
12/27/17
03/08/17
08/04/16
06/30/17
Perimeter
MP-7 07/17/13
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Table 1 (Page 1 of 2)
Hart & Hickman, PC
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-001
BalancePercent (%)Sampling
Date Ambient/Subsurface Location
(Landfill/Perimeter)Methane (CH4)Carbon dioxide (CO₂)Oxygen (O2)Well ID
Ambient 0.0 0.4 21.4 78.1
Subsurface 31.3 16.4 0.5 51.5
Ambient 0.0 0.1 20.9 79.0
Subsurface 34.6 14.7 0.4 48.9
Ambient 0.1 0.2 22.8 76.9
Subsurface 46.0 16.0 1.2 36.8
Ambient 0.0 0.1 20.4 79.5Subsurface36.2 22.0 0.3 41.5
Ambient 0.0 0.7 20.5 78.9Subsurface36.1 17.5 1.9 44.0
Ambient 0.0 0.3 19.4 80.3Subsurface40.3 20.5 0.2 39.5
Ambient 0.0 0.1 20.0 78.4Subsurface39.5 19.5 0.4 40.8
Ambient 0.0 0.2 22.7 77.2Subsurface33.4 16.8 0.2 49.6
Ambient 0.0 0.0 20.8 79.4Subsurface33.6 17.9 0.2 48.3
Ambient 0.0 0.0 20.9 79.0Subsurface35.6 17.2 0.2 47.0
Ambient 0.0 0.1 21.9 78.0Subsurface56.7 17.4 0.5 25.5
Ambient 0.0 1.8 14.6 83.7
Subsurface 0.0 0.3 21.5 78.2
Ambient 0.0 0.1 20.8 79.2
Subsurface 0.0 5.7 0.4 93.0
Ambient 0.0 0.4 22.1 77.5
Subsurface 0.4 12.2 0.1 87.3
Ambient 0.0 0.1 19.9 80.0Subsurface0.6 8.7 2.4 88.0
Ambient 0.0 0.2 20.6 79.2Subsurface0.1 10.6 0.1 89.2
Ambient 0.0 0.5 19.8 79.8Subsurface0.1 11.6 0.2 87.9
Ambient 0.0 0.2 20.6 79.2Subsurface0.2 9.3 0.4 89.9
Ambient 0.0 0.1 22.7 77.2Subsurface0.0 8.4 0.3 91.3
Ambient 0.0 0.0 20.6 79.3Subsurface0.0 9.4 0.3 90.2
Ambient 0.0 0.3 20.2 79.1Subsurface0.0 10.6 0.2 89.1
Ambient 0.0 0.0 21.4 78.5Subsurface0.1 11.7 0.8 87.5
<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
Ambient Measurements were taken adjacent to MP locations immediatley prior to subsurface reading.
Readings collected with a conditioned in-line charcoal filter.
DEQ Soild Waste Section Sceening Level
MP-17 Perimeter
12/26/18
MP-16
12/26/18
Landfill
06/29/18
06/29/18
03/23/18
12/27/17
03/08/17
09/21/18
09/21/18
12/27/17
06/30/17
04/02/15
03/23/18
04/02/15
11/17/15
08/04/16
09/28/17
03/08/17
11/17/15
08/04/16
06/30/17
09/28/17
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Table 1 (Page 2 of 2)
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-001
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
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
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
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
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
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
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
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
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
Readings collected with a conditioned in-line charcoal filter.
Building 1AMB-2
Building 1AMB-1
AMB-8 Building 2
AMB-7 Building 2
AMB-6 Building 2
Building 2AMB-5
Building 1AMB-4
Building 1AMB-3 BalanceMethane (CH4)Carbon dioxide (CO₂)Oxygen (O2)Well ID Sampling
Date Location Percent (%)
S:\AAA-Master Projects\Loftis-Blythe Brownfields site (HTZ)\Reports\Methane monitoring\2018 Annual Report\Tables\Methane point data table 12-26-18
1/4/2019
Table 2
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-001
Ambient 0.0 0.1 20.6 79.3
Subsurface 0.0 0.1 20.4 79.5
Ambient 0.0 0.1 19.6 80.3Subsurface0.0 0.1 19.7 80.2
Ambient 0.0 0.2 19.8 78.6Subsurface0.0 0.2 19.9 78.6
Ambient 0.0 0.1 19.6 80.3Subsurface0.0 0.1 19.7 80.2
Ambient 0.0 0.0 20.3 79.6
Subsurface 0.0 0.1 20.2 79.7
Ambient 0.0 0.0 20.3 79.5Subsurface0.0 0.1 20.2 79.5
Ambient 0.0 0.0 22.1 77.8Subsurface0.0 0.1 22.2 77.8
Ambient 0.0 0.1 20.2 79.7
Subsurface 0.0 0.1 20.0 79.9
Ambient 0.0 0.1 19.8 80.1Subsurface0.1 0.1 20.0 79.8
Ambient 0.0 0.1 20.0 78.4Subsurface0.0 0.2 19.9 78.5
Ambient 0.0 0.1 19.8 80.1Subsurface0.0 0.1 20.0 79.9
Ambient 0.0 0.1 20.3 79.6
Subsurface 0.0 0.0 20.3 79.5
Ambient 0.0 0.1 20.2 79.6Subsurface0.0 0.1 20.1 79.5
Ambient 0.0 0.0 22.1 77.8Subsurface0.0 0.1 22.1 77.9
Ambient 0.0 0.1 20.0 79.9
Subsurface 0.0 0.2 20.0 79.8
Ambient 0.1 0.1 20.1 79.7Subsurface0.1 0.1 20.2 79.6
Ambient 0.0 0.1 20.0 78.3Subsurface0.0 0.2 19.9 78.2
Ambient 0.0 0.1 19.8 80.1Subsurface0.0 0.1 20.0 79.8
Ambient 0.0 0.0 20.4 79.5
Subsurface 0.0 0.1 20.3 79.6
Ambient 0.0 0.1 20.2 79.5Subsurface0.0 0.1 20.1 79.5
Ambient 0.0 0.0 22.1 77.8Subsurface0.0 0.0 22.1 77.9Ambient0.0 0.2 20.8 79.0Subsurface0.0 0.1 20.8 79.0Ambient0.0 0.2 19.3 80.5Subsurface0.0 0.2 19.4 80.5Ambient0.0 0.2 19.8 77.9Subsurface0.0 0.1 20.0 78.2
Ambient 0.0 0.1 19.6 80.3Subsurface0.0 0.1 19.7 80.2
Ambient 0.0 0.1 20.4 79.5
Subsurface 0.0 0.0 20.4 79.5
Ambient 0.0 0.0 20.1 79.4Subsurface0.0 0.0 20.1 79.4
Ambient 0.0 0.0 21.9 78.0Subsurface0.0 0.0 22.1 77.8
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.
Readings collected with a conditioned in-line charcoal filter.
06/29/18
09/21/18
09/21/18
09/21/18
09/21/18
06/30/17
09/28/17
12/27/17
06/30/17
09/28/17
12/27/17
06/30/17
09/28/17
12/27/17
03/23/18
03/23/18
Well ID Sampling
Date Ambient/Subsurface Percent (%)Methane (CH4)Carbon dioxide (CO₂)Oxygen (O2)BalanceTrench
12/26/18
Manhole-1
12/26/18
Manhole-2
12/26/18
Manhole-3
12/26/18
06/29/18
03/23/18
03/23/18
06/29/18
06/29/18
06/30/17
09/28/17
12/27/17
S:\AAA-Master Projects\Loftis-Blythe Brownfields site (HTZ)\Reports\Methane monitoring\2018 Annual Report\Tables\Methane point data table 12-26-18
1/4/2019
Table 3
Hart & Hickman, PC
FIGURES
0 2000 4000
APPROXIMATE
SCALE IN FEET
N
U.S.G.S. QUADRANGLE MAP
QUADRANGLE7.5 MINUTE SERIES (TOPOGRAPHIC)
TITLE
PROJECT
SITE LOCATION MAP
LOFTIS-BLYTHE CONSTRUCTION SITE
5600 AND 5518 DAVID COX ROAD CHARLOTTE, NORTH CAROLINA
DATE:
JOB NO:
REVISION NO:
FIGURE:
01-26-18 0
1HTZ-001
SITE
2923 S. Tryon Street, Suite 100
Charlotte, NC 28203
704.586.0007(p) 704.586.0373(f)DERITA, NC 1996
MP-16
MP-15
DAVID C
O
X

R
O
A
D
BUILDING 1
(5600 DAVID COX ROAD)OLD STATESVILLE ROADMP-17
MP-2
MP-14
MP-12 MP-10
MP-13 MP-7
MP-8
MP-9
MP-11
MP-6
MP-1
MP-10R
PAVED
AREA
PAVED
AREA
BUILDING 2
(5518 DAVID COX ROAD)
OFFICES
OFFICES
WAREHOUSE
(VACANT)
WAREHOUSE
(TIRE WHOLESALES)
OFFICES
WAREHOUSE
BATHROOMS
WAREHOUSE
MVW-6
MVW-7
MVW-5
MVW-4
MVW-3
MVW-8
MVW-2
MVW-1
LEGEND
SITE PROPERTY BOUNDARY
CHAINLINK FENCE
APPROXIMATE EXTENT OF
LANDFILL AREA
PERMANENT METHANE PROBE
LOCATION
TEMPORARY METHANE PROBE
LOCATION (JULY 2013)
APPROXIMATE LOCATION OF
METHANE VENT WELL
(INSTALLED JANUARY 2018)
DUKE POWER RIGHT-OF-WAY
JOB NO. HTZ-001
REVISION NO. 0DATE: 1-4-19
FIGURE NO. 2
LOFTIS-BLYTHE CONSTRUCTION SITE
5600 DAVID COX ROAD
CHARLOTTE, NORTH CAROLINA
SUBSURFACE METHANE MONITORING
PROBE LOCATION MAP
NOTE:
BOLD CONCENTRATION INDICATES
EXCEEDANCE OF DEQ SOLID WASTE
SECTION SCREENING LEVEL OF 1.25%.
CONSTITUENT CONCENTRATION %
METHANE PROBE ID
MP-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
METHANE 0.0 4.2 11.6 16.0 14.9 13.5 15.5 16.6 13.6
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
METHANE 0.0 2.6 8.7 12.4 13.8 13.1 13.8 14.5 14.2 12.5 11.9
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
METHANE 0.0 0.0 0.4 0.6 0.1 0.1 0.2 0.0 0.0 0.0 0.1
SAMPLE DATE
PAVED
AREA
PAVED
AREA
PAVED
AREA
PAVED
AREA
PAVED
AREA
MP-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
METHANE 0.0 4.2 11.6 16.0 14.9 13.5 15.5 16.6 13.6 10.8 14.2
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
METHANE 31.3 34.6 46.0 36.2 36.1 40.3 39.5 33.4 33.6 35.6 56.7
2923 South Tryon Street-Suite 100
Charlotte, North Carolina 28203
704-586-0007(p) 704-586-0373(f)
License # C-1269 / #C-245 Geology
MP-16
MP-15
DAVID C
O
X

R
O
A
D
BUILDING 1
(5600 DAVID COX ROAD)OLD STATESVILLE ROADMP-17
MP-10R
PAVED
AREA
PAVED
AREA
BUILDING 2
(5518 DAVID COX ROAD)
OFFICES
OFFICES
WAREHOUSE
(VACANT)
WAREHOUSE
(TIRE WHOLESALES)
OFFICES
WAREHOUSE
BATHROOMS
WAREHOUSE
AMB-6
AMB-5
AMB-8
AMB-7
AMB-3
AMB-2
AMB-4
AMB-1
MVW-6
MVW-7
MVW-5
MVW-4
MVW-3
MVW-8
MVW-2
MVW-1
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
METHANE 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
LEGEND
SITE PROPERTY BOUNDARY
CHAINLINK FENCE
APPROXIMATE EXTENT OF
LANDFILL AREA
PERMANENT METHANE PROBE
LOCATION
AMBIENT AIR SAMPLE
APPROXIMATE LOCATION OF
METHANE VENT WELL
DUKE POWER RIGHT-OF-WAY
JOB NO. HTZ-001
REVISION NO. 0DATE: 1-4-19
FIGURE NO. 3
LOFTIS-BLYTHE CONSTRUCTION SITE
5600 DAVID COX ROAD
CHARLOTTE, NORTH CAROLINA
INDOOR METHANE MONITORING LOCATION MAP
NOTE:
BOLD CONCENTRATION INDICATES
EXCEEDANCE OF DEQ SOLID WASTE
SECTION SCREENING LEVEL.
CONSTITUENT CONCENTRATION %
METHANE PROBE ID
SAMPLE DATE
PAVED
AREA
PAVED
AREA
PAVED
AREA
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
METHANE 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
AMB-2 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
METHANE 0.0 0.0 0.0 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
METHANE 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
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
METHANE 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
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
METHANE 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
AMB-6 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
METHANE 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
AMB-8 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
METHANE 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
AMB-7 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
METHANE 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
2923 South Tryon Street-Suite 100
Charlotte, North Carolina 28203
704-586-0007(p) 704-586-0373(f)
License # C-1269 / #C-245 Geology
MP-16
MP-15
MP-10R
MANHOLE-2
MANHOLE-3
MANHOLE-1
TR
E
N
C
H
-
1
MVW-7
MVW-8
MVW-2
BUILDING 2
(5518 DAVID COX ROAD)
LEGEND
SITE PROPERTY BOUNDARY
DUKE POWER RIGHT-OF-WAY
TRENCH DRAIN
SANITARY SEWER MANHOLE
PERMANENT METHANE PROBE
LOCATION
APPROXIMATE LOCATION OF
METHANE VENT WELL
JOB NO. HTZ-001
REVISION NO. 0DATE: 1-4-19
FIGURE NO. 4
LOFTIS-BLYTHE CONSTRUCTION SITE
5600 AND 5518 DAVID COX ROAD
CHARLOTTE, NORTH CAROLINA
MANHOLE & TRENCH SAMPLE LOCATION MAP
PAVED
AREA
OFFICES
OFFICES
WAREHOUSE
(VACANT)
WAREHOUSE
(TIRE WHOLESALES)
2923 South Tryon Street-Suite 100
Charlotte, North Carolina 28203
704-586-0007(p) 704-586-0373(f)
License # C-1269 / #C-245 Geology
CONSTITUENT CONCENTRATION %
SAMPLE ID
MANHOLE-2 6/30/17 9/28/17 12/27/17 3/25/18 6/26/18 9/21/18 12/26/18
METHANE 0.0 0.0 0.0 0.0 0.0 0.0 0.0
SAMPLE DATE
MANHOLE-2 6/30/17 9/28/17 12/27/17 3/25/18 6/26/18 9/21/18 12/26/18
METHANE 0.0 0.1 0.0 0.0 0.0 0.0 0.0
MANHOLE-3 6/30/17 9/28/17 12/27/17 3/25/18 6/26/18 9/21/18 12/26/18
METHANE 0.0 0.1 0.0 0.0 0.0 0.0 0.0
MANHOLE-1 6/30/17 9/28/17 12/27/17 3/23/18 6/26/18 9/21/18 12/26/18
METHANE 0.0 0.0 0.0 0.0 0.0 0.0 0.0
TRENCH-1 6/30/17 9/28/17 12/27/17 3/25/18 6/26/18 9/21/18 12/26/18
METHANE 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Appendix A
Equipment Calibration Documents
CALIBRATION LOG
LANDTEC - GEM 5000+
Instrument: LANDTEC Serial Number: G502512
Calibrated materials required:Lot:KBH-341TSM-1
Lot:JBH-1-15 Exp:10/6/2021
Exp:10/6/2021
Lot:IBH-399-7
Lot:BBI-161-4-4 Exp:10/6/2021
Exp:2/9/2022
Lot:CBI-49-1000-2
Lot:CBI-98-200-1 Exp:02/09/2022
Exp:2/9/2020
.
Carbon Filter Saturation (CH4) - Condition: PASS
Gas Calibration Check Performed at Room Temperature
GEM 5000+ (FRESH AIR CALIBRATION)
SENSOR Initial Reading CAL Reading Tolerance Comments
CH4 (%)0.1 0.1 +/- 0.5%
CO (ppm)0.0 0.0 +/- 5 ppm
H2S (ppm)0.0 0.0 +/- 5 ppm
H2 (%)-34.0 0 +/- 1.5%
GEM 5000+ (MULTI SPAN GAS CALIBRATION)
CH4 HIGH CALIBRATION
SENSOR Initial Reading CAL Reading Tolerance Comments
CH4 (%)48.8 50.0 +/- 0.5%
C02 (%)35.1 35.0 +/- 1.5%
O2 (%)0.1 0.0 +/- 1.5%
02 HIGH CALIBRATION
SENSOR Initial Reading CAL Reading Tolerance Comments
CH4 (%)11.9 10.0 +/- 0.5%
C02 (%)11.5 10.0 +/- 1.5%
O2 (%)0.0 0.0 +/- 1.5%
02 HIGH CALIBRATION
SENSOR Initial Reading CAL Reading Tolerance Comments
O2 (%)19.7 20.9 +/- 0.5%
02 LOW CALIBRATION
SENSOR Initial Reading CAL Reading Tolerance Comments
O2 (%)4.1 4.0 +/- 0.5%
CO CALIBRATION
SENSOR Initial Reading CAL Reading Tolerance Comments
CO (ppm)992 1000 +/- 50 ppm
H2S CALIBRATION
SENSOR Initial Reading CAL Reading Tolerance Comments
H2S (ppm)192 200 +/- 10 ppm
Signature: lms Date: 3/23/2018
CALIBRATION LOG
LANDTEC - GEM 5000+
ES # 1255
Instrument: LANDTEC Serial Number: G502512
Calibrated materials required:Lot:GBH-341TSM-1
Lot:FBI-161-4-1 Exp:6/27/2021
Exp:5/9/2022
Lot:KBH-49-1000-3
Lot:BBI-1-4 Exp:10/6/2021
Exp:2/9/2022
Lot:FBI-98-200-1
Lot:CBI-399-2 Exp:05/09/20
Exp:2/9/2022
.
Carbon Filter Saturation (CH4) - Condition: PASS
Gas Calibration Check Performed at Room Temperature
GEM 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 0 +/- 1.5%
GEM 5000+ (MULTI SPAN GAS CALIBRATION)
METHANE HIGH CALIBRATION
SENSOR Initial Reading CAL Reading Tolerance Comments
CH4 (%)41.5 50.0 +/- 0.5%
C02 (%)28.9 35.0 +/- 1.5%
O2 (%)0.2 0.0 +/- 1.5%
METHANE LOW CALIBRATION
SENSOR Initial Reading CAL Reading Tolerance Comments
CH4 (%)11.9 10.0 +/- 0.5%
C02 (%)11.3 10.0 +/- 1.5%
O2 (%)0.0 0.0 +/- 1.5%
OXYGEN HIGH CALIBRATION
SENSOR Initial Reading CAL Reading Tolerance Comments
O2 (%)20.7 20.9 +/- 0.5%
OXYGEN LOW CALIBRATION
SENSOR Initial Reading CAL Reading Tolerance Comments
O2 (%)4.2 4.0 +/- 0.5%
CARBON MONOXIDE CALIBRATION
SENSOR Initial Reading CAL Reading Tolerance Comments
CO (ppm)992 1000 +/- 50 ppm
HYDROGEN SULFIDE CALIBRATION
SENSOR Initial Reading CAL Reading Tolerance Comments
H2S (ppm)190 200 +/- 10 ppm
Signature: RQA Date: 6/29/2018
METHANE LOWOXYGEN LOW
CARBON MONOXIDEOXYGEN HIGH
HYDROGEN SULFIDEMethane High
CALIBRATION LOG
LANDTEC - GEM 5000+
ES # 1255
Instrument: LANDTEC Serial Number: G502512
Calibrated materials required:Lot:GBI-341TSM-1
Lot:FBI-161-4-1 Exp:6/12/2022
Exp:5/9/2022
Lot:KBH-49-1000-3
Lot:BBI-1-4 Exp:10/6/2021
Exp:2/9/2022
Lot:GBI-98-200-1
Lot:EBI-399-6 Exp:06/12/20
Exp:5/9/2022
.
Carbon Filter Saturation (CH4) - Condition: PASS
Gas Calibration Check Performed at Room Temperature
GEM 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 (%)-0.7 0.0 +/- 1.5%
GEM 5000+ (MULTI SPAN GAS CALIBRATION)
METHANE HIGH CALIBRATION
SENSOR Initial Reading CAL Reading Tolerance Comments
CH4 (%)50.0 50.0 +/- 0.5%
C02 (%)35.1 35.0 +/- 1.5%
O2 (%)0.0 0.0 +/- 1.5%
METHANE LOW CALIBRATION
SENSOR Initial Reading CAL Reading Tolerance Comments
CH4 (%)9.3 10.0 +/- 0.5%
C02 (%)9.7 10.0 +/- 1.5%
O2 (%)-0.3 0.0 +/- 1.5%
OXYGEN HIGH CALIBRATION
SENSOR Initial Reading CAL Reading Tolerance Comments
O2 (%)20.1 20.9 +/- 0.5%
OXYGEN LOW CALIBRATION
SENSOR Initial Reading CAL Reading Tolerance Comments
O2 (%)3.9 4.0 +/- 0.5%
CARBON MONOXIDE CALIBRATION
SENSOR Initial Reading CAL Reading Tolerance Comments
CO (ppm)955 1000 +/- 50 ppm
HYDROGEN SULFIDE CALIBRATION
SENSOR Initial Reading CAL Reading Tolerance Comments
H2S (ppm)196 200 +/- 10 ppm
Signature: RQA Date: 9/21/2018
METHANE LOWOXYGEN LOW
CARBON MONOXIDEOXYGEN HIGH
HYDROGEN SULFIDEMethane High
CALIBRATION LOG
LANDTEC - GEM 5000+
ES # 1255
Instrument: LANDTEC Serial Number: G502512
Calibrated materials required:Lot:CBI-341TSM-1
Lot:GBI-161-4-1 Exp:2/9/2022
Exp:6/12/2022
Lot:GBI-49-1000-4
Lot:EBI-1-8 Exp:6/12/2022
Exp:5/9/2022
Lot:GBI-98-200-1
Lot:KBI-399-1 Exp:06/12/20
Exp:10/10/2022
.
Carbon Filter Saturation (CH4) - Condition: PASS
Gas Calibration Check Performed at Room Temperature
GEM 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 (%)-0.2 0.0 +/- 1.5%
GEM 5000+ (MULTI SPAN GAS CALIBRATION)
METHANE HIGH CALIBRATION
SENSOR Initial Reading CAL Reading Tolerance Comments
CH4 (%)50.0 50.0 +/- 0.5%
C02 (%)35.0 35.0 +/- 1.5%
O2 (%)0.0 0.0 +/- 1.5%
METHANE LOW CALIBRATION
SENSOR Initial Reading CAL Reading Tolerance Comments
CH4 (%)10.0 10.0 +/- 0.5%
C02 (%)10.0 10.0 +/- 1.5%
O2 (%)0.0 0.0 +/- 1.5%
OXYGEN HIGH CALIBRATION
SENSOR Initial Reading CAL Reading Tolerance Comments
O2 (%)21.0 20.9 +/- 0.5%
OXYGEN LOW CALIBRATION
SENSOR Initial Reading CAL Reading Tolerance Comments
O2 (%)4.0 4.0 +/- 0.5%
CARBON MONOXIDE CALIBRATION
SENSOR Initial Reading CAL Reading Tolerance Comments
CO (ppm)970 1000 +/- 50 ppm
HYDROGEN SULFIDE CALIBRATION
SENSOR Initial Reading CAL Reading Tolerance Comments
H2S (ppm)198 200 +/- 10 ppm
Signature: RQA Date: 12/26/2018
METHANE LOWOXYGEN LOW
CARBON MONOXIDEOXYGEN HIGH
HYDROGEN SULFIDEMethane High