RA-630_3880_CA_MRP_20231031

2725 E. Millbrook Road, Suite 121
Raleigh, NC 27604
Telephone [phone]
www.atcgroupservices.com

October 31, 2023

Ms. Linda Blalock
North Carolina Department of Environmental Quality
Division of Waste Management
Underground Storage Tank Section
1646 Mail Service Center
Raleigh, North Carolina 27699-1646

Subject: Groundwater Monitoring Report
Former K&L Grocery
2281 Beaverdam Road
Enfield, Halifax County, North Carolina
NCDEQ Incident No. 3880

Dear Ms. Blalock:

ATC Associates of North Carolina, P.C. (ATC) is submitting the enclosed Groundwater Monitoring Report for
the K&L Grocery site. The report presents investigative procedures, field activities, and laboratory analytical
results for an air sparge well installation event, an air sparge enhanced Aggressive Fluid Vapor Recovery
(AFVR) event, and a subsequent groundwater sampling event conducted in August and September 2023.

If you have any questions or require additional information, please contact our office at
[phone].

Sincerely,
ATC Associates of North Carolina, P.C.

Nicholas Kramer Gabriel Araos, P.E.
Project Scientist Senior Project Manager
Direct Line: 919-573-1198 Direct Line: 919-573-1205
Email: [e-mail] Email: [e-mail]

Attachments:
1. Groundwater Monitoring Report

Prepared for:

North Carolina Department of Environmental Quality
Division of Waste Management – Underground Storage Tank Section
1646 Mail Service Center
Raleigh, North Carolina 27699

GROUNDWATER MONITORING REPORT
K&L Grocery
INCIDENT # 3380
2281 BEAVERDAM ROAD
ENFIELD, HALIFAX COUNTY, NORTH CAROLINA

ATC Project No. STL0388001

Prepared by:

ATC Associates of North Carolina, P.C.
2725 E. Millbrook Road, Suite 121
Raleigh, North Carolina 27604
Telephone [phone]

Nicholas Kramer
Project Scientist
Direct Line: 919-573-1198
Email: [e-mail]

Gabriel Araos, P.E.
Senior Project Manager
Direct Line: 919-573-1205
Email: [e-mail]

October 31, 2023
K&L Grocery
October 31, 2023
Page 1 of 9

ATC Project No. STL0388001 NCDEQ State Lead Program
Table of Contents
1.0 SITE IDENTIFICATION ................................................................................................................................ 2
2.0 EXECUTIVE SUMMARY ........................................................................................................................ 3
3.0 SITE DESCRIPTION .............................................................................................................................. 4
3.1 SITE CHARACTERIZATION .................................................................................................................................... 4
3.2 SITE BACKGROUND ............................................................................................................................................ 4
4.0 AIR SPARGE ENHANCED AGGRESSIVE FLUID VAPOR RECOVERY......................................... 6
4.1 AIR SPARGE WELL INSTALLATION ......................................................................................................................... 6
4.2 AIR SPARGE-ENHANCED AFVR EVENT .................................................................................................................. 6
5.0 GROUNDWATER CHARACTERIZATION ........................................................................................... 7
5.1 GROUNDWATER LEVELS...................................................................................................................................... 7
5.2 GROUNDWATER QUALITY ................................................................................................................................... 7
6.0 CONCLUSIONS AND RECOMMENDATIONS .................................................................................... 8
7.0 LIMITATIONS .......................................................................................................................................... 9

TABLES:
Table 1 – Water Supply Well Information
Table 2 – Monitoring Well Construction and Groundwater Elevation Data
Table 3 –Total Emissions Calculations
Table 4 – Dissolved Oxygen Readings
Table 5 – Groundwater Analytical Results
Table 6 – Historical Groundwater Analytical Results
Table 7 – Field Parameters

FIGURES:
Figure 1 – Site Topographic Map
Figure 2 – Site Map
Figure 3 – Potential Receptor Map
Figure 4 – Groundwater Elevation Contour Map
Figure 5 – Dissolved Benzene Isoconcentration Contour Map
Figure 6 – Dissolved 1,2-Dichloroethane Isoconcentration Contour Map
Figure 7 – Additional Chemicals of Concern in Groundwater Map

APPENDICES:
Appendix A – Conceptual Site Model
Appendix B – Site Photographs
Appendix C – Field Notes
Appendix D – Boring log and Well Construction Record – AS-1
Appendix E – Notice of Intent and Injection Event Record
Appendix F – Waste Disposal Manifests
Appendix G – Laboratory Analytical Results
Appendix H – GSI Mann-Kendall Toolkits

K&L Grocery
October 31, 2023
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ATC Project No. STL0388001 NCDEQ State Lead Program
2.0 EXECUTIVE SUMMARY

ATC Associates of North Carolina, P.C. (ATC) has completed a Groundwater Monitoring Report (GMR) for
the K&L Grocery site located at 2281 Beaverdam Road, Enfield, Halifax, North Carolina. This report
documents an air sparge well installation event, an air sparge enhanced AFVR event, and a subsequent
monitoring well sampling event conducted at the site in August and September 2023. The GMR was
performed based on the Task Authorization (TA-01), dated June 13, 2023, by the Trust Fund Branch of the
Underground Storage Tank (UST) Section, Division of Waste Management, North Carolina Department of
Environmental Quality (NCDEQ). The work is performed as part of the State Lead Contract #N70522-B
between NCDEQ and ATC.

The K&L Grocery site is located at 2281 Beaverdam Road in Enfield, Halifax County, North Carolina.
Currently onsite is an unoccupied single-story residential building that has been partially burned down and
is overgrown with vegetation. The UST system at the site formerly consisted of two 550-gallon gasoline
USTs. The UST system was removed from the site on August 5, 1992. Four water supply wells (WSW-1
through WSW-4) are located within 1,000 feet of the site, one of which is located on the site property (WSW-
1). Two of the wells are inactive (WSW-1 and WSW-2), one well is used for irrigation purposes (WSW-3),
and one well is used for potable purposes (WSW-4).

ATC supervised the installation of air sparge well AS-1 on August 22, 2023, to be used for future air sparge-
enhanced AFVR events. On August 29, 2023, ATC supervised an air sparge enhanced AFVR event at the
site. The AFVR event was performed in order to reduce elevated constituent concentrations in the local
groundwater and utilized wells MW-1, MW-8, and MW-9 as extraction points during the event. During the
AFVR event, ATC performed a simultaneous air sparge event on well AS-1. LNAPL was not detected prior to,
during, or after the event. During the event, dissolved oxygen measurements were recorded in MW-6R, MW-
8, and MW-9. Approximately 786 gallons of petroleum impacted groundwater and 0.45 gallons of petroleum
impacted vapor were recovered.

On September 29, 2023, groundwater samples were collected from wells MW-1, MW-2, MW-6R, MW-8,
and MW-9. Light non-aqueous phase liquid (LNAPL) was not detected during the sampling event.
Laboratory analytical results indicated the presence of petroleum constituents exceeding the 2L Standards
in monitoring wells MW-1, MW-2, MW-6R, MW-8, and MW-9. Benzene, 1,2-dibromoethane (EDB), and 1,2-
dichloroethane (1-2DCE) concentrations exceeded applicable Gross Contamination Levels (GCLs) in well
MW-1.

A comparison of the current analytical results (September 2023) to the results of the previous sampling
event (August 2022) indicates an increase in contaminant concentrations in monitoring wells MW-1, MW-
6R and MW-8. It should be noted that wells MW-2 and MW-9 have not been sampled since December 2019
and both wells indicated an increase in contaminant concentrations.

It appears that in the short-term, the air-sparge enhanced AFVR event was not effective in reducing the
contaminant concentrations at the site. However, the long-term trends for VOCs indicate a
decreasing/stable plume. Based on the groundwater results, the groundwater impact is mostly defined
horizontally.

Based on the current site conditions, ATC recommends conducting a comprehensive groundwater
sampling event in March 2024.

K&L Grocery
October 31, 2023
Page 4 of 9

ATC Project No. STL0388001 NCDEQ State Lead Program
3.0 SITE DESCRIPTION

3.1 SITE CHARACTERIZATION

K&L Grocery is located at 2281 Beaverdam Road in Enfield, Halifax County, North Carolina. Currently
onsite is an unoccupied single-story residential building that has been partially burned down and is
overgrown with vegetation. The property has been owned by Ms. Holly Keeter since 1992; however, the
residential structure was rented to Ms. Bertha Daniels and then to Ms. Arlene Benfield. The UST system at
the site formerly consisted of two 550-gallon gasoline USTs. The UST system was removed from the site
on August 5, 1992.

The site is bounded by Beaverdam Road (SR 1206) to the west and Neville Farm Road (SR 1237) to the
north. Surrounding properties are characterized by residential or agricultural use or are undeveloped. Four
water supply wells (WSW-1 through WSW-4) are located within 1,000 feet of the site, one of which is located
on the site property (WSW-1). Two of the wells are inactive (WSW-1 and WSW-2), one well is used for
irrigation purposes (WSW-3), and one well is used for potable purposes (WSW-4). Water supply well
ownership information is included in Table 1. A site topographic map is included as Figure 1 and a site
map depicting monitoring well locations and other pertinent site features is included as Figure 2. A potential
receptor map showing water supply well locations is included as Figure 3. A conceptual site model is
included as Appendix A. Site photographs are included as Appendix B.

3.2 SITE BACKGROUND

K&L Grocery was in operation from the early 1950’s to 1975 as a convenience store and retail gasoline
facility. The K&L Grocery building has since been razed. In January 1989, Ms. Lillie Greene (2656
Beaverdam Road – located west of the site across Beaverdam Road) complained to the NCDEQ of a
petroleum odor in her drinking water. The Halifax County Health Department collected samples from the
Greene well and the Daniel well (located adjacent and north of the Greene residence). Laboratory results
indicated petroleum hydrocarbons in both wells. The former K&L Grocery was identified as the source of
impact.

Assessment activities were performed at the site in response to the water supply well analytical results.
During the assessment, 21 soil borings were advanced, five monitoring wells were installed, and a
geophysical survey was performed to determine the location of the USTs. Soil and groundwater analytical
results indicated a release at the former K&L Grocery. Based on the assessment, replacement water supply
wells were installed in October 1991 for Ms. Greene and Ms. Barfield (onsite).

In February 1993, a tank closure report documented the removal of two 550-gallon USTs from the site and
the abandonment of three water supply wells (old Greene well, old Barfield well, and the Daniels well). The
USTs were removed from the site on August 5, 1992. During the UST removal, approximately 15 cubic
yards of impacted soil was excavated and land-farmed onsite. Soil samples collected during the UST
removal indicated petroleum impacted soil at the site.

A soil excavation was performed at the site in May 2001. During the excavation, approximately 1,198.7 tons
of soil were removed from the site and approximately 1,620 pounds of oxygen releasing compound (ORC)
were emplaced in the bottom of the excavation pit prior to backfilling. Another soil excavation was performed
in May 2011, at which time approximately 2,211.07 tons of petroleum-impacted soil were removed from the
site.

Between June 1991 and May 2012, thirteen groundwater monitoring events were performed at the site.

On March 23, 2012, Force Environmental Consulting Company, LLC, collected three air samples from the
Greene residence. Progress Environmental, Inc. submitted a Groundwater Monitoring Report on June 12,
2012 documenting the air sampling event; however, the report contained only a text summary with no figure
showing sampling locations or details regarding sampling procedures. Some of the sampling locations can
be ascertained by the sample labels, which indicated Crawl Space, HVAC, and Kitchen. Laboratory results
K&L Grocery
October 31, 2023
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ATC Project No. STL0388001 NCDEQ State Lead Program
of the air samples indicated concentrations of toluene at 1.2 micrograms per cubic milligram (µg/mg3) in the
crawlspace sample and 1.4 µg/mg3 in the HVAC sample. The kitchen sample contained toluene at 5 µg/mg3,
naphthalene at 3.3 µg/mg3, and total hydrocarbons (THC) as gas at 1,020 µg/mg3. A 2012 NCDEQ Health
Risk Evaluation concluded that the naphthalene concentration in the Kitchen sample was above acceptable
risk levels. Concentrations of THC as gas were also a concern based on the elevated level, although no
screening levels had been established for THC.

On July 1, 2014, ATC performed crawlspace air sampling to evaluate the risk of vapor intrusion in the
Greene residence. The results of the crawlspace air sampling indicated detectable benzene at a
concentration below the Division of Waste Management Residential Indoor Air Screening Levels. In
addition, C5-C8 aliphatics carbon fraction class was also detected at a concentration below the adjusted
screening level derived from the EPA Regional Screening Levels. Based on the analytical results, ATC
concluded that there is no significant vapor intrusion risk for the Greene residence.

ATC submitted a Groundwater Monitoring Report on August 11, 2015, documenting a May 2015 sampling
event. Results from the groundwater monitoring event indicated petroleum constituents in monitoring wells
MW-1, MW-2, MW-6R, and MW-9 with benzene, 1,2-dibromoethane (EDB), and 1,2-dichloroethane (1,2-
DCA) exceeding their established GCLs in wells MW-1, MW-6R, and MW-9.

Based on the May 2015 sampling event, ATC performed an aggressive fluid vapor recovery (AFVR) event
on wells MW-1, MW-6R, and MW-9. Approximately 235 gallons of petroleum impacted water were removed
from the site during the event. ATC also attempted to gain approval from the site property owner for
abandoning onsite water supply well WSW-1; however, approval was not granted.

ATC sampled monitoring wells MW-1, MW-6R, and MW-9 in February 2016 to determine the effectiveness
of the AFVR event. The AFVR appeared effective in reducing petroleum concentrations in MW-9 but select
compound concentrations increased in MW-1 and MW-6R. ATC recommended performing quarterly AFVR
events and the use of O-SOXs to reduce concentrations at the site.

On September 15, 2016, a groundwater monitoring report was submitted documenting an AFVR event and
groundwater sampling event conducted in May and June 2016. An AFVR event was conducted on MW-1,
MW-6R, and MW-9. At the conclusion of the event, approximately 316 gallons of petroleum impacted
groundwater were removed from the site. ATC installed O-SOXs following the event.

On June 16, 2016, a groundwater sampling event was conducted. Laboratory results indicated
concentrations exceeding the 2L Standards in monitoring wells MW-1, MW-2, MW-6R, and MW-9.
Dissolved benzene, 1,2-dibromoethane (EDB), and 1,2-dichloroethane (1,2-DCA) exceeded the GCLs in
MW-1 and/or MW-6R.

ATC submitted a Groundwater Monitoring Report on January 26, 2017, documenting an AFVR event on
MW-1, MW-6R, and MW-9 followed by a groundwater sampling event. At the conclusion of the AFVR event,
approximately 571 gallons of petroleum impacted water and 0.03 gallons of petroleum vapor were removed
from the site. Results from the groundwater sampling event indicated petroleum impact above 2L Standards
in monitoring wells MW-1, MW-2, MW-6R, MW-8, and MW-9. Benzene, EDB, and 1,2-DCA exceeded their
established GCLs in the groundwater samples collected from wells MW-1, MW-6R, and/or MW-8.

ATC submitted Groundwater Monitoring Reports on November 12, 2018 and February 12, 2020,
documenting limited groundwater sampling events performed in June 2018 and December 2019,
respectively. Results from the groundwater monitoring events indicated petroleum impact above 2L
Standards in monitoring wells MW-1, MW-2, MW-6R, and MW-9. During the June 2018 sampling event,
compound concentrations at the site reduced to below their respective GCLs for the first time in the site’s
history (with the exception of MW-8 which was not sampled during the reporting period). Laboratory
analytical results of the December 2019 sampling event indicated petroleum hydrocarbon compounds at
concentrations exceeding 2L Standards in monitoring wells MW-1, MW-2, MW-6R, and MW-9. Additionally,
1,2-DCA exceeded its established GCL in monitoring well MW-1.

K&L Grocery
October 31, 2023
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ATC Project No. STL0388001 NCDEQ State Lead Program
ATC submitted Groundwater Monitoring Reports on July 30, 2021 and October 3, 2022, documenting
limited groundwater sampling events performed in June 2021 and August 2022, respectively. ATC
personnel mobilized to the site to collect groundwater samples from monitoring wells MW-1, MW-6R, and
MW-8. These wells were selected as they have historically indicated exceedances of GCLs. Laboratory
analytical results of the sampling event indicated numerous petroleum compounds at concentrations
exceeding the 2L Standards in all three monitoring wells during both the June 2021 and August 2022
events. In addition, benzene, EDB, and 1,2-DCA were detected above their respective GCLs in monitoring
well MW-1 during both events.

This report documents an air sparge well installation event, an air sparge enhanced AFVR event, and a
subsequent limited groundwater sampling event conducted in August and September 2023.

4.0 AIR SPARGE ENHANCED AGGRESSIVE FLUID VAPOR RECOVERY

4.1 AIR SPARGE WELL INSTALLATION

ATC supervised the installation of air sparge well AS-1 on August 22, 2023, to be used for future air sparge-
enhanced AFVR events. Geologic Exploration, Inc., installed the well using hand auger and hollow-stem
auger drilling technology. The well was installed to 20 feet below ground surface (bgs) and screened from
15 to 20 feet bgs. Lithology encountered during the well installations consisted primarily of silty sand, sandy
silt, and clay. Well construction details are summarized on Table 2. Field notes from the August 2023 well
installation event are included in Appendix C. The boring log and well construction record of air sparge
well, AS-1, are included in Appendix D

4.2 AIR SPARGE-ENHANCED AFVR EVENT

On August 29, 2023, ATC supervised an air sparge enhanced AFVR event at the site. Prior to the air sparge
activities, ATC submitted a Notice of Intent to Construct or Operate Injection Wells (NOI) to the NCDEQ
Division of Water Quality (DWQ). ATC received approval under Permit #WI0501118. Upon completion of
the AFVR event, an Injection Event Record was submitted to NCDEQ.

The AFVR event was performed in order to reduce elevated constituent concentrations in the local
groundwater. Wells MW-1, MW-8, and MW-9 were utilized as extraction points during the event. During the
AFVR event, ATC performed a simultaneous air sparge event on well AS-1, which is located in close proximity
to MW-1. During the AFVR events, air was injected into well AS-1 at an average pressure of 15 pounds per
square inch (psi) and at an average flow rate of 5 cubic feet per minute (cfm). The purpose of the enhanced air
sparge event was to volatilize the petroleum compounds in the subsurface for removal by the AFVR activities.
The air sparge event also increases the oxygen levels in the groundwater, which can then enhance aerobic
degradation of the petroleum compounds.

Prior to performing the event, monitoring wells AS-1, MW-1, MW-6R, MW-8, and MW-9 were gauged for
the presence of LNAPL and to record groundwater elevations. In an attempt to evaluate the effectiveness
of the air sparge activities, dissolved oxygen (DO) measurements were also recorded in monitoring wells
MW-6R, MW-8, and MW-9 before, during, and after the event. It should be noted that approximately 4 hours
into the event, ATC ceased utilizing MW-8 as an extraction point due to a poor recharge rate observed
within the well and began utilizing MW-9 as an extraction point. Monitoring well construction details are
included as Table 2. Dissolved oxygen readings recorded during the event are included as Table 3. The
AFVR calculations are included in Table 4. Site photographs are included in Appendix B. Field notes from
the August 2023 AFVR event are included in Appendix C. A copy of the NOI and Injection Event Record
are included as Appendix E.

During AFVR activities, a liquid ring vacuum pump unit is plumbed to the designated extraction point, and
drop “stinger” pipes were extended into the wells through an airtight seal at the top of the well casing (TOC)
and into the water column. Throughout the AFVR process, a cone of depression forms around a designated
recovery point by drawing down the groundwater surface levels, thus causing impacted water surrounding
K&L Grocery
October 31, 2023
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ATC Project No. STL0388001 NCDEQ State Lead Program
the recovery point to be extracted. Soil petroleum vapor within the cone of depression and the overlying
vadose zone are removed as vapor by air passing through the soil.

The August 2023 AFVR event generated approximately 786 gallons of petroleum impacted groundwater.
Field parameters, including velocity, temperature, and volatile organic compound (VOC) concentrations
were recorded throughout the event. Based on the field readings, approximately 0.45 gallons of petroleum
impacted vapor were also recovered. The waste disposal manifest from the event is provided in Appendix
F.

5.0 GROUNDWATER CHARACTERIZATION

5.1 GROUNDWATER LEVELS

ATC personnel conducted a groundwater sampling event at the site on September 29, 2023. Groundwater
level measurements were recorded from wells MW-1, MW-2, MW-6R, MW-8, and MW-9. LNAPL was not
detected during the sampling event. Depth to groundwater measurements ranged from 1.61 feet bgs in
MW-9 to 4.82 feet bgs in MW-8. Based on the September 2023 groundwater gauging event, groundwater
flows semi-radially across the site to the north, east, and south. Historically, groundwater flow direction has
been inferred to flow towards the south-southwest Monitoring well construction details and groundwater
elevation data are summarized in Table 2. A groundwater elevation contour map is included as Figure 4.
Photographs of the monitoring well locations are included in Appendix B. Field notes from the sampling
event are included in Appendix C.

5.2 GROUNDWATER QUALITY

On September 29, 2023, groundwater samples were collected from wells MW-1, MW-2, MW-6R, MW-8,
and MW-9. A field blank sample was also collected as part of the groundwater sampling event. The
groundwater samples were placed in laboratory-supplied containers, entered into chain-of-custody control,
placed on ice, and shipped to Pace Analytical in Mount Juliet, Tennessee for analysis by Standard Method
6200B. Field parameter data, including temperature, dissolved oxygen, conductivity, pH, and oxygen
reduction potential, were recorded during the sampling event and are included in Table 5. Field notes from
the sampling event are included in Appendix C.

The laboratory analytical results exhibited numerous compounds above 2L Standards:
 Benzene: MW-1, MW-2, MW-6R, MW-8, MW-9
 Toluene: MW-1, MW-6R
 Ethylbenzene: MW-1, MW-6R
 Total Xylenes: MW-1, MW-6R
 EDB: MW-1, MW-9
 1,2-DCE: MW-1, MW-2, MW-6R, MW-8, MW-9
 Isopropylbenzene: MW-1
 Naphthalene: MW-1, MW-2, MW-6R, MW-8, MW-9
 n-Propylbenzene: MW-1, MW-6R
 1,2,4-Trimethylbenzene: MW-1, MW-6R
 1,3,5-Trimethylbenzene: MW-1

Benzene, EDB, and 1-2DCE were detected at concentrations exceeding the applicable GCLs in well MW-
1. No additional compounds were detected above the respective GCLs. A summary of the laboratory
analytical results from the September 2023 event are included in Table 6. Historical groundwater analytical
results are included in Table 7. An isoconcentration contour map for dissolved benzene and 1,2-DCE are
included as Figure 5 and Figure 6, respectively. A map depicting additional constituents of concern in
groundwater is included as Figure 7. The laboratory analytical report and chain-of-custody forms are
included in Appendix G.

K&L Grocery
October 31, 2023
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ATC Project No. STL0388001 NCDEQ State Lead Program
A comparison of the current analytical results (September 2023) to the results of the previous sampling
event (August 2022) indicates an increase in contaminant concentrations in monitoring wells MW-1, MW-
6R and MW-8. It should be noted that wells MW-2 and MW-9 have not been sampled since December 2019
and both wells indicated an increase in contaminant concentrations.

ATC reviewed groundwater concentrations trends for key compounds in wells MW-1, MW-2, MW-6R, MW-
8, and MW-9 using GSI Mann-Kendall Toolkits. Benzene was determined to indicate a stable trend in MW-
2 and decreasing trends in wells MW-1, MW-6R, MW-8, and MW-9. Toluene, ethylbenzene, total xylenes,
and EDB indicated stable trends in MW-1. Toluene, ethylbenzene, and total xylenes indicated decreasing
trends in MW-2, MW-6R, MW-8, and MW-9. Wells MW-1, MW-6R, and MW-9 indicated decreasing trends
for 1,2-DCE. EDB indicated a stable trend in wells MW-1 and MW-2 and decreasing trends in MW-6R, MW-
8, and MW-9. No statistical trend was determined for wells MW-2 and MW-8 in regard to 1,2-DCA. The GSI
Mann-Kendall Toolkits are included as Appendix H.

As part of ATC’s quality assurance and quality control (QA and QC) measures, a data review of the
laboratory report was conducted. During the review, it was concluded that samples were received by the
laboratory in acceptable condition and properly preserved. The samples were analyzed within the correct
holding times, and the chain of custody was properly completed by all parties. The laboratory QC report
shows an internal blank was analyzed for each method that was used for the original samples. The
laboratory fortified blank (LFB) and laboratory control sample (LCS) data results were also provided for
each analytical method. Concentrations of acetone, 2-butanone, and methylene chloride were detected in
the field blank sample, below their respective 2L Standards. Acetone and methylene chloride are common
laboratory contaminants and are likely associated with the laboratory. Additionally, concentrations of
acetone and methylene chloride were not detected in the groundwater samples collected from the
monitoring wells. 2-Butanone is commonly associated with petroleum sites and is potentially the result of
cross-contamination during field sampling activities. However, the concentration was flagged with a “J”
qualifier denoting that the concentration value is an estimate. Overall, ATC concludes that the laboratory
results are usable and any exceptions do not significantly impact the conclusions presented in this report.
Refer to the laboratory reports in Appendix G for details regarding QA results for the laboratory samples
and any noted exceptions.

6.0 CONCLUSIONS AND RECOMMENDATIONS

On behalf of the Trust Fund Branch of the UST Section, ATC has completed a Groundwater Monitoring
Report documenting an 8-hour air-sparge enhanced AFVR event and subsequent groundwater monitoring
event for the K&L Grocery site, located at 2281 Beaverdam Road in Enfield, Halifax County, North Carolina.
The findings from the recent assessment activities indicate the following:

 The air-sparge enhanced AFVR event generated approximately 786 gallons of petroleum impacted
groundwater and recovered approximately 0.45 gallons of petroleum impacted vapor.

 Groundwater samples were collected from monitoring wells MW-1, MW-2, MW-6R, MW-8, and
MW-9. LNAPL was not detected during the AFVR or sampling events;

 Laboratory analytical results indicated the presence of petroleum constituents exceeding the 2L
Standards in monitoring wells MW-1, MW-2, MW-6R, MW-8, and MW-9. Benzene, EDB, and 1-
2DCE concentrations exceeded the GCLs in MW-1;

 A comparison of the current analytical results (September 2023) to the results of the previous
sampling event (August 2022) indicates an increase in contaminant concentrations in monitoring
wells MW-1, MW-6R and MW-8.

K&L Grocery
October 31, 2023
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ATC Project No. STL0388001 NCDEQ State Lead Program
It appears that in the short-term, the air-sparge enhanced AFVR event was not effective in reducing the
contaminant concentrations at the site. However, the long-term trends for VOCs indicate a
decreasing/stable plume. Based on the groundwater results, the groundwater impact is mostly defined
horizontally.

Based on the current site conditions, ATC recommends conducting a comprehensive groundwater
sampling event in March 2024.

7.0 LIMITATIONS

This report has been prepared for the exclusive use of the NCDEQ. The opinions included herein are based
on information obtained during the study, on our experience in accordance with currently accepted
hydrogeologic and engineering practices, and relevant regulatory guidelines at this time and location. Other
than this, no warranty is implied or intended.

K&L Grocery

ATC Project No. STL0388001 NCDEQ State Lead Program
TABLES
TABLE 1
WATER SUPPLY WELL INFORMATION
FORMER K&L GROCERY
2281 BEAVERDAM ROAD
ENFIELD, HALIFAX COUNTY, NORTH CAROLINA
INCIDENT #3880
Well #Well Owner Property Address Well Use Distance from Source
Area (feet)
Connected to
Municipal Water
Upgradient or
Downgradient
WSW-1
Holley J. Keeter
110 Line Boat Lane
Swansboro, NC 28584
910-545-3083
2281 Beaverdam Road
Enfield, NC 27823 Inactive Site No -Vacant Lot Site
WSW-2 Inactive 600 feet southwest Downgradient
WSW-3 Irrigation*700 feet west Cross to downgradient
WSW-4
Eden United Methodist Church
Rt. 2
Enfield, NC 27823
252-445-5983
Beaverdam Road
Enfield, NC 27823 Potable 950 feet north No Upgradient
Ditch
Holley J. Keeter
110 Line Boat Lane
Swansboro, NC 28584
910-545-3083
2281 Beaverdam Road
Enfield, NC 27823 NA Site No -Vacant Lot Site
1. NA = Not Applicable
2. * Well used by Ms. Lillie Green (2656 Beaverdam Road)
Notes:
Leonard H. Hardy
PO Box 607
Enfield, NC 27823
Phone Number Not Available
2778 Beaverdam Road
Enfield, NC 27823 Yes
Page 1 of 1
TABLE 2
MONITORING WELL CONSTRUCTION AND GROUNDWATER ELEVATION DATA
FORMER K&L GROCERY
2281 BEAVERDAM ROAD
ENFIELD, HALIFAX COUNTY, NORTH CAROLINA
INCIDENT #3880
Monitoring
Well Date Installed Well Depth
(feet)
Screened
Interval
(feet)
Date Measured
TOC
Elevation
(feet)
Depth to
Water
(feet bgs)
Water Table
Elevation
(feet)
05/18/15 3.61 119.99
9/23/15 - Pre-AFVR 7.37 116.23
9/23/15 - Post-AFVR 16.12 107.48
02/17/16 4.31 119.29
5/13/16 - Pre-AFVR 2.42 121.18
5/13/16 - Post-AFVR 15.88 107.72
06/16/16 3.95 119.65
10/13/16 - Pre-AFVR 1.95 121.65
11/15/16 - Pre-AFVR 4.95 118.65
12/13/16 5.21 118.39
06/28/18 7.00 116.60
12/17/19 2.65 120.95
06/14/21 5.84 117.76
08/26/22 7.27 116.33
8/29/2023 - Pre-AFVR 7.80 115.80
8/29/2023 - Post-AFVR 9.35 114.25
09/29/23 12.11 111.49
05/18/15 2.83 116.50
06/16/16 2.52 116.81
12/13/16 4.27 115.06
06/28/18 3.58 115.75
12/17/19 1.35 117.98
09/29/23 3.72 115.61
05/18/15
06/16/16 3.06 115.94
12/13/16 3.64 115.36
06/28/18
12/17/19
05/18/15 3.22 118.51
06/16/16 3.28 118.45
12/13/16 2.98 118.75
06/28/18
12/17/19
05/18/15
06/16/16
12/13/16
06/28/18
12/17/19
MW-1 05/1991 16.5 6.5-16.5 123.60
2.75-12.75 119.00
05/1991MW-2
05/1991MW-4
MW-3 05/1991
13
11.8
121.73
119.331.8-11.8
3-13
12.75
MW-5 05/1991 16 Could Not Locate6-16 125.15
Could Not Locate
Could Not Locate
Not Measured
Not Measured
Not Measured
Not Measured
Not Measured
Not Measured
Could Not Locate
Page 1 of 3
TABLE 2
MONITORING WELL CONSTRUCTION AND GROUNDWATER ELEVATION DATA
FORMER K&L GROCERY
2281 BEAVERDAM ROAD
ENFIELD, HALIFAX COUNTY, NORTH CAROLINA
INCIDENT #3880
Monitoring
Well Date Installed Well Depth
(feet)
Screened
Interval
(feet)
Date Measured
TOC
Elevation
(feet)
Depth to
Water
(feet bgs)
Water Table
Elevation
(feet)
05/18/15 2.35 117.84
9/23/15 - Pre-AFVR 4.65 115.54
9/23/15 - Post-AFVR 10.78 109.41
02/17/16 1.03 119.16
5/13/16 - Pre-AFVR 1.52 118.67
5/13/16 - Post-AFVR 11.40 108.79
06/16/16 1.87 118.32
10/13/16 - Pre-AFVR 2.00 118.19
11/15/16 - Pre-AFVR 3.62 116.57
12/13/16 3.96 116.23
06/28/18 4.60 115.59
12/17/19 1.84 118.35
06/14/21 3.22 116.97
08/26/22 3.93 116.26
8/29/2023 - Pre-AFVR 4.59 115.60
8/29/2023 - Post-AFVR 4.13 116.06
09/29/23 3.58 116.61
05/18/15 4.70 120.16
06/16/16 4.63 120.23
12/13/16 5.45 119.41
06/28/18
12/17/19
05/18/15
06/16/16
12/13/16 3.42 116.17
06/28/18
12/17/19
06/14/21 3.89 115.70
08/26/22 5.31 114.28
8/29/2023 - Pre-AFVR 5.39 114.20
8/29/2023 - Post-AFVR 13.24 106.35
09/29/23 5.31 114.28
05/18/15 2.53 117.06
9/23/15 - Pre-AFVR 3.75 115.84
9/23/15 - Post-AFVR 10.95 108.64
02/17/16 1.63 117.96
5/13/16 - Pre-AFVR 2.00 117.59
5/13/16 - Post-AFVR 11.65 107.94
06/16/16 1.14 118.45
10/13/16 - Pre-AFVR 0.25 119.34
11/15/16 - Pre-AFVR 2.88 116.71
12/13/16 3.10 116.49
06/28/18 4.25 115.34
12/17/19 0.85 118.74
8/29/2023 - Pre-AFVR 0.50 119.09
8/29/2023 - Post-AFVR 10.43 109.16
09/29/23 1.61 117.98
MW-7 08/2000 15
MW-6R Unknown 12.3
MW-8 08/2000 14
MW-9 Unknown 12.7 2-12.7 119.59
4-14
5-15
Could Not Locate
Could Not Locate
Could Not Locate
Could Not Locate
120.19
119.59
2-12.3
Not Measured
124.86
Not Measured
Page 2 of 3
TABLE 2
MONITORING WELL CONSTRUCTION AND GROUNDWATER ELEVATION DATA
FORMER K&L GROCERY
2281 BEAVERDAM ROAD
ENFIELD, HALIFAX COUNTY, NORTH CAROLINA
INCIDENT #3880
Monitoring
Well Date Installed Well Depth
(feet)
Screened
Interval
(feet)
Date Measured
TOC
Elevation
(feet)
Depth to
Water
(feet bgs)
Water Table
Elevation
(feet)
8/29/2023 - Pre-AFVR 18.78 --
8/29/2023 - Post-AFVR 18.76 --
Notes:
1. TOC = Top of Casing.
2. Depth to groundwater measured from TOC.
3. Elevations are referenced to Mean Sea Level Datum (MSL).
4. NA = Not Applicable.
5. bgs = below ground surface.
7. Unknown denotes information not available in previous reports on file for site.
AS-1 08/2023 16 6-16 NS
Page 3 of 3
TABLE 3
DISSOLVED OXYGEN READINGS DURING AFVR EVENT - AUGUST 29, 2023
FORMER K&L GROCERY
2281 BEAVERDAM ROAD
ENFIELD, HALIFAX COUNTY, NORTH CAROLINA
INCIDENT #3880
Monitoring
Well Date Time
Dissolved
Oxygen
(mg/L)
8:30 0.93
10:30 0.06
12:30 0.13
14:30 0.09
16:30 0.70
14:30 Dry
16:30 5.61
8:30 3.16
10:30 0.22
12:30 0.35
Notes:
1. mg/L = milligrams per liter.
2. NM = Not Measured due to surface water in manway.
MW-6R 8/29/2023
MW-8 8/29/2023
MW-9 8/29/2023
Page 1 of 1
TABLE 4
TOTAL EMISSIONS CALCULATIONS - AUGUST 29, 2023
FORMER K&L GROCERY
2281 BEAVERDAM ROAD
ENFIELD, HALIFAX COUNTY, NORTH CAROLINA
INCIDENT #3880
Time Delta Time
(minute)
VOC
Concentration
(ppm)
Velocity
(feet/minute)
Temp
(˚F)
Relative
Humidity
(%)
Stack
Diameter
(inches)
Air Flow
(cfm)
Specific
Humidity
(lbW/lbDA)
Water
Vapor
(vol %)
Dry Basis
Air Flow
(dscfm)
Dry VOC
Concentration
(ppm)
Response
Factor
Corrected VOC
Concentration
(ppm)
Mass
Concentration
(mg/m3)
Mass
Concentration
(lb/ft3)
Mass
Removed
(lb)
8:30 0 399.7 2,512 172.7 13.9 6.0 22 0.040 0.060 17 425 1 425 2,262 0.000141 0.00
8:45 15 330.9 1,946 190.7 9.3 6.0 22 0.040 0.060 17 352 1 352 1,872 0.000117 0.03
9:00 15 607.3 1,971 156.8 12.5 6.0 22 0.024 0.037 18 631 1 631 3,355 0.000209 0.06
9:15 15 1,050.0 1,703 163.1 10.6 6.0 22 0.024 0.037 18 1,090 1 1,090 5,797 0.000362 0.10
9:30 15 314.2 1,816 185.4 7.9 6.0 22 0.030 0.045 17 329 1 329 1,750 0.000109 0.03
9:45 15 173.5 1,552 196.2 7.5 6.0 22 0.036 0.054 17 183 1 183 976 0.000061 0.02
10:00 15 121.9 1,414 200.0 6.3 6.0 22 0.032 0.049 17 128 1 128 682 0.000043 0.01
10:15 15 128.3 2,110 200.0 11.2 6.0 21 0.060 0.088 15 141 1 141 748 0.000047 0.01
10:30 15 109.6 1,785 200.0 9.1 6.0 21 0.048 0.071 16 118 1 118 627 0.000039 0.01
11:00 30 112.1 1,692 200.0 8.4 6.0 20 0.044 0.066 15 120 1 120 638 0.000040 0.02
11:30 30 223.2 940 200.0 6.6 6.0 20 0.034 0.052 15 235 1 235 1,252 0.000078 0.04
12:00 30 113.6 1,268 192.7 7.3 6.0 20 0.032 0.049 15 119 1 119 635 0.000040 0.02
12:30 30 88.3 1,914 200.0 5.4 6.0 20 0.028 0.042 15 92 1 92 490 0.000031 0.01
13:30 60 79.7 1,642 145.3 15.6 6.0 25 0.023 0.035 21 83 1 83 439 0.000027 0.03
14:30 60 69.8 1,555 181.0 7.9 6.0 25 0.027 0.041 20 73 1 73 387 0.000024 0.03
15:30 60 62.3 945 152.8 13.2 6.0 20 0.023 0.036 17 65 1 65 344 0.000021 0.02
16:30 60 56.7 720 145.7 15.5 6.0 20 0.023 0.035 17 59 1 59 312 0.000020 0.02
0.45
Total Emissions in Gallons 0.07
Notes:
VOC = Volatile organic compounds measured using a photoionization detector (PID)
ppm = parts per million
cfm = cubic feet per minute
Air Flow= π*(Stack Diameter (in.)/12/2)2*Velocity
Specific Humidity = Data from psychrometric chart at measured temperature and relative humidity in pounds of water per pound of dry air (lbW/lbDA).
Water Vapor = % water vapor on a volume basis = (Specific Humidity / 18 lb-mole H2O) / [(1 / 28.84 lb-mole dry air) + (Specific Humidity / 18 lb-mole H2O)]
Dry Basis Air Flow = Flow volume on a dry basis at a standard temperature of 68˚F = (1-Water Vapor) (Air Flow) [528˚R / (Temperature+460)]
dscfm = dry standard cubic feet per minute
Dry VOC Concentration = [VOC Concentration / (1-Water Vapor)]
Response Factor = Response Factor of PID; 1 if response factor is unknown
Corrected VOC Concentration = Dry VOC Concentration x Response Factor
Mass Concentration (mg/m3) = Mass concentration VOC as gasoline dry basis at standard temperature = (Corrected VOC Concentration) (128 mg/mg-mole / 24.07 m3/mg-mole)
Mass Concentration (lb/ft3) = [Mass Concentration (mg/m3)] [(6.243 * 10-8)(lb/ft3)/(mg/m3)]
mg/m3 = milligrams per cubic meter
lb/ft3 = pounds per cubic foot
Mass Removed (lb) = [Mass Concentration (lb/ft3)] [Dry Basis Air Flow (dscfm)] [Time Interval (min)]
Total Emissions in Pounds
Page 1 of 1
TABLE 5
FIELD PARAMETERS
FORMER K&L GROCERY
2281 BEAVERDAM ROAD
ENFIELD, HALIFAX COUNTY, NORTH CAROLINA
INCIDENT #3880
6/28/2018 22.6 1.28 230.8 6.53 -35.3
12/17/2019 16.5 3.23 353.4 5.46 -196.1
6/14/2021
8/26/2022 23.7 2.35 627 6.09 199.4
9/29/2023 20.6 3.5 980 4.42 206.7
6/28/2018 28.5 1.44 230.7 4.85 123.0
12/17/2019 17.5 3.96 123.9 5.70 -99.1
6/14/2021
9/29/2023 24.3 1.77 179.8 5.15 90.5
6/28/2018 25.2 0.79 415.4 6.34 -57.9
12/17/2019 16.1 2.58 126.9 5.80 -203.9
6/14/2021
8/26/2022 23.9 0.58 201.3 6.41 14.3
9/29/2023 22.6 1.06 269.8 4.59 155.9
6/14/2021 20.7 2.16 247.8 5.04 113.2
8/26/2022 23.1 1.65 162.7 5.51 115.4
9/29/2023 21.8 1.91 286.8 4.59 155.9
6/28/2018 27.4 0.94 413.6 6.28 -28.9
12/17/2019 16.2 2.66 123.8 5.64 -190.3
6/14/2021
9/29/2023 22.1 1.75 156.4 5.93 21.8
Notes:
1. °C = degrees celsius.
2. mg/L = milligram per liter.
3. µS/cm = microsiemens per centimeter.
4. std unit = standard unit.
5. mV = millivolts. ORP (mV)WELL ID Date
Collected
Temperature (oC) Dissolved Oxygen (mg/L) Specific Conductivity (us/cm) pH (std unit)MW-9
MW-8
MW-2
Visual sheen- parameters not collected
Visual sheen- parameters not collected
MW-1
MW-6R
Not Sampled
Not Sampled
Page 1 of 1
TABLE 6
GROUNDWATER ANALYTICAL RESULTS
FORMER K&L GROCERY
2281 BEAVERDAM ROAD
ENFIELD, HALIFAX COUNTY, NORTH CAROLINA
INCIDENT #3880
Benzene Toluene Ethylbenzene Xylenes n-Butylbenzene sec-Butylbenzene 1,2-Dibromoethane 1,4-Dichlorobenzene 1,2-Dichloroethane Di-Isopropyl Ether Isopropylbenzene p-Isopropyltoluene 2-Butanone (Mek) Methylene Chloride 4-Methyl-2-Pentanone (Mibk) Naphthalene n-Propylbenzene 1,2,4-Trimethylbenzene 1,3,5-TrimethylbenzeneMW-1 09/29/2023 15,800 34,100 3,800 21,370 <500 <500 1,130 <500 4,490 <500 214 J <500 <5,000 <2,500 <5,000 910 435 J 2,510 675
MW-2 09/29/2023 257 1.48 1.03 1.72 4.60 4.55 <1.00 0.740 J 25.1 <1.00 29.9 1.27 <10.0 <5.00 <10.0 66.2 6.77 3.76 0.320 J
MW-6R 09/29/2023 901 920 770 2,818 <1.00 3.05 <1.00 <1.00 14.5 <1.00 33.7 <1.00 <10.0 <5.00 7.94 J 108 105 745 157
MW-8 09/29/2023 1,090 40.2 100 267 <1.00 0.403 J <1.00 <1.00 255 4.41 6.62 0.654 J 5.85 J <5.00 8.72 J 23.0 12.8 85.0 57.6
MW-9 09/29/2023 181 17.6 35.8 62.6 0.743 J 0.510 J 0.641 J <1.00 18.0 <1.00 4.01 <1.00 <10.0 <5.00 <10.0 13.4 8.81 36.0 4.54
1 600 600 500 70 70 0.02 6 0.4 70 70 25 4,000 5 100 6 70 400 400
5,000 260,000 80,000 50,000 5,900 8,800 50 405 400 70,000 30,500 11,700 4,000,000 5,000 100,000 6,000 26,100 28,500 24,100
Notes:
1. "<" or ND = Not detected at or above the reporting limit.
2. Concentrations are reported in micrograms per liter (ug/l) = parts per billion.
3. Concentrations in bold print equal or exceed the NCDEQ 2L Standard (2L Standard) - April 2022.
4. NCDEQ = North Carolina Department of Environmental Quality.
5. GCL = Gross Contaminantion Level.
6. NE = Not Established.
7. J = The reported value is an estimate. The identification of the analyte is acceptable.
8. Concentrations in bold italicized print equal or exceed the GCL.
Sample ID Date
Collected
Standard Method 6200B
GC
2L Standard
Page 1 of 1
TABLE 7
HISTORICAL GROUNDWATER ANALYTICAL RESULTS
FORMER K&L GROCERY
2281 BEAVERDAM ROAD
ENFIELD, HALIFAX COUNTY, NORTH CAROLINA
INCIDENT #3880
Monitoring
Well
Sampling
Date
Benzene Toluene Ethylbenzene Total Xylenes MTBE Naphthalene 1,2-Dibromoethane Isopropyl Ether sec-Butylbenzene tert-Butylbenzene Isopropylbenzene n-Propylbenzene 1,2-Dichlorobenzene 1,4-Dichlorobeznene 1,2-Dichloroethane 1,1,2-Trichloroethane 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene1 600 600 500 20 6 0.02 70 70 70 70 70 20 6 0.4 0.6 400 400
5,000 260,000 80,000 50,000 20,000 6,000 50 70,000 8,800 14,750 30,500 26,100 20,000 405 400 600 28,500 24,100
6/17/1991 18,000 24,000 1,800 10,100 ----------------------------
8/18/1995 15,100 24,700 2,350 14,900 ----------------------------
2/18/1999 15,600 25,600 1,910 12,100 ----------------------------
8/22/2000 8,000 5,800 690 ------<250 --------------1,600 ------
4/26/2001 18,000 28,000 2,600 14,300 ----940 ----------<100 <100 3,600 ------
6/29/2001 (1)18,300 17,100 1,410 9,810 ----------------20,000 ----------
7/30/2001 13,800 26,700 1,760 12,600 ----855J ----------<1,000 <1,000 2,930 ------
11/28/2001 12,300 19,400 1,440 11,100 ----769 ----------<500 <500 2,940 ------
10/3/2003 14,000 290 1,900 12,700 --240 1,240 --110 --71 180 <8 25 <8 --1,300 330
4/29/2010 14,800 25,000 2,130 13,430 <10.0 117 890 <10.0 <10.0 <10.0 77.2 177 ----2,720 --1,120 288
5/17/2011 14,700 26,200 2,250 7,200 <10.0 166 NA 19.6 <10.0 4,800 99.2 236 <10.0 <10.0 3,760 ND 170 391
10/12/2011 16,500 28,200 2,480 16,180 --232 NA ND ND ND 122 302 ND ND 4,550 ND 1,570 429
5/31/2012 12,600 21,100 2,080 12,830 --ND 1,030 ND ND ND 67.5 184 ND ND 2,800 ND 1,210 304
5/18/2015 5,700 15,000 1,800 13,900 <45 <60 390 <250 <42 <48 70J 200J <38 <23 <97 <58 1,500 350
2/17/2016 11,000 21,000 2,000 13,100 <4.5 130 640 <9 <6.5 <5.5 75 200 <8.5 <7.5 <9.7 <5.8 1,500 380
6/16/2016 8,200 13,000 1,000 8,800 <22 <30 660 <45 <32 <30 48J 120J <42 <38 1,400 <59 1,100 290
12/13/2016 8,400 14,000 1,400 11,300 <12 120 660 9J <12 <12 61 160 <12 <12 1,900 <12 1,300 320
6/28/2018 660 530 210 1,160 <5.0 81 46 <5.0 1.3J <5.0 11 26 <5.0 <5.0 120 <5.0 240 61
12/17/2019 1,820 3,090a 170a 2,900a <100 <100 <100 <100 <100 <100 <100 <100 <100 <100 437a <60 304a <100
6/14/2021 9,130 16,600 1,420 10,390 <100 <500 617 <100 <100 <100 51.5J 123 <100 <100 1,640 <100 910 271
8/26/2022 8,760 14,900 1,380 9,020 <100 140J 678 <100 <100 <100 49.1J 79.5 J <100 <100 1,960 <100 804 173
9/29/2023 15,800 34,100 3,800 21,370 <500 910 1,130 <500 <500 <500 214 J 435 J <500 <500 4,490 <500 2,510 675
6/17/1991 3,100 1,300 890 3,000 ----------------------------
8/18/1995 926 90 536 2,760 ----------------------------
2/18/1999 667 <100 149 2,660 ----------------------------
8/22/2000 --------------36 --------<5 ----------
4/26/2001 210 30 69 830 ----1 22 --------4 <1 <1 ------
6/29/2001 (1)732 17.4 29.3 1,640 ----------------------------
6/29/2001 (2)773 23.8 33.4 1,575 ----------------------------
7/30/2001 252 8.7J 27.9 955 ----<10 26.7 --------<10 <10 <10 ------
11/28/2001 8.2 1.3 <1 12.5 ----<1 2.7 --------<1 <1 <1 ------
10/3/2003 570 <0.5 71 1,990 --11 <0.5 <0.5 <0.5 --<0.5 11 15.0 <0.5 <0.5 --1,300 21
4/29/2010 757 87.5 84.1 1,089 <0.5 159 ND 64.4 6.63 <0.5 69.4 89.5 22 ND ND ND 623 49.5
10/12/2011 676 13.6 39.9 363.7 --171 ND ND ND ND 72.9 85.4 ND 1.70 59.7 ND 482 110
5/31/2012 414 3.4 3.4 347.1 --119 6.1 ND ND ND 39 16.3 ND ND 39.6 ND 89.6 ND
5/18/2015 310 1.4 1 217 <0.09 140 6.1 <0.18 6.4 0.22J 56 28 0.25J 1.5 <0.19 <0.12 240 0.82
6/16/2016 320 1.3J 1.4J 158.8 <0.45 120 4.8 <0.9 6.9 <0.6 44 5 <0.85 1.1J 20 <1.2 13 5.2
12/13/2016 410 6.7 30 54 <2.5 140 <2.5 <2.5 6.8 <2.5 47 34 <2.5 1.1J 33 <2.5 150 4.5
6/28/2018 470 4.7 11 137 <0.50 120 3.5 0.31J 7.8 0.19J 55 19 0.20J 1.6 39 <0.50 76 2.7
12/17/2019 23.6 <0.50 0.94 10 <0.50 2.4 <0.50 <0.50 <0.50 <0.50 2.1 1.3 <0.50 <0.50 3.2 <0.30 5.7 2.3
6/14/2021
8/26/2022
9/29/2023 257 1.48 1.03 1.72 <1.00 66.2 <1.00 <1.00 4.55 <1.00 29.9 6.77 <1.00 0.740 J 25.1 <1.00 3.76 0.320 J
Not Sampled
2L Standard
GCL
MW-1
MW-2
Not Sampled
Page 1 of 5
TABLE 7
HISTORICAL GROUNDWATER ANALYTICAL RESULTS
FORMER K&L GROCERY
2281 BEAVERDAM ROAD
ENFIELD, HALIFAX COUNTY, NORTH CAROLINA
INCIDENT #3880
Monitoring
Well
Sampling
Date
Benzene Toluene Ethylbenzene Total Xylenes MTBE Naphthalene 1,2-Dibromoethane Isopropyl Ether sec-Butylbenzene tert-Butylbenzene Isopropylbenzene n-Propylbenzene 1,2-Dichlorobenzene 1,4-Dichlorobeznene 1,2-Dichloroethane 1,1,2-Trichloroethane 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene1 600 600 500 20 6 0.02 70 70 70 70 70 20 6 0.4 0.6 400 400
5,000 260,000 80,000 50,000 20,000 6,000 50 70,000 8,800 14,750 30,500 26,100 20,000 405 400 600 28,500 24,100
2L Standard
GCL
6/17/1991 <1 <1 <1 <1 ----------------------------
8/18/1995
2/18/1999 <1 <1 <1 <1 ----------------------------
8/22/2000 <1 <1 <1 <4 ------<1 --------<1 ----------
4/26/2001 <1 <1 <1 <4 ----<1 <1 --------<1 <1 <1 ------
6/29/2001 (1)
6/29/2001 (2)
7/30/2001 <1 <1 <1 <1 ----<1 <1 --------<1 <1 <1 ------
11/28/2001 3.5 2.5 0.6J 1.8 ----<1 <1 --------<1 <1 <1 ------
10/3/2003 <0.5 0.6 <0.5 <1.5 --<0.5 <0.5 <0.5 <0.5 --<0.5 <0.5 <0.02 <0.5 <0.5 --<0.5 <0.5
4/29/2010 <0.5 <0.5 <0.5 <1.5 <0.5 <2.0 --<0.5 <0.5 <0.5 <0.5 <1.0 <0.02 ------<0.5 <0.5
5/17/2011
10/12/2011 ND ND ND ND --ND 12.3 ND ND ND ND ND ND ND ND ND ND ND
5/31/2012 ND ND ND ND --ND ND ND ND ND ND ND ND ND ND ND ND ND
5/18/2015
6/16/2016 <0.12 <0.17 <0.13 <0.26 <0.09 <0.12 <0.15 <0.18 <0.13 <0.12 <0.12 <0.13 <0.17 <0.15 <0.19 <0.24 <0.18 <0.13
12/13/2016 <0.50 <0.50 <0.50 <1.0 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
6/28/2018
12/17/2019
6/14/2021
8/26/2022
9/29/2023
6/17/1991 <1 <1 <1 <1 ----------------------------
8/18/1995
2/18/1999 <1 <1 <1 <1 ----------------------------
8/22/2000 <1 <1 <1 <4 ------<1 --------<1 ----------
4/26/2001 <1 <1 <1 <4 ----<1 <1 --------<1 <1 <1 ------
6/29/2001 (1)
6/29/2001 (2)
7/30/2001 <1 <1 <1 <1 ----<1 <1 --------<1 <1 <1 ------
11/28/2001 0.8J 1.3 <1 0.5J ----<1 <1 --------<1 <1 <1 ------
10/3/2003 <0.5 <0.5 <0.5 <1.5 --<0.5 <0.5 <0.5 <0.5 --<0.5 <0.5 <0.02 <0.5 <0.5 --<0.5 <0.5
4/29/2010 <0.5 <0.5 <0.5 <1.5 --<2.0 --<0.5 <0.5 <0.5 <0.5 <1.0 <0.02 ------<0.5 <0.5
5/17/2011
10/12/2011 ND ND ND ND --ND ND ND ND ND ND ND ND ND ND ND ND ND
5/31/2012 ND ND ND ND --ND ND ND ND ND ND ND ND ND ND ND ND ND
5/18/2015 <0.079 0.1J 0.11J 0.6J <0.09 <0.12 <0.089 <0.18 <0.084 <0.096 <0.11 <0.094 <0.076 <0.046 <0.076 <0.12 0.27 <0.1
6/16/2016 <0.12 <0.17 <0.13 <0.26 <0.09 <0.12 <0.15 <0.18 <0.13 <0.12 <0.12 <0.13 <0.17 <0.15 <0.19 <0.24 <0.18 <0.13
12/13/2016 <0.50 <0.50 <0.50 <1.0 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
6/28/2018
12/17/2019
6/14/2021
8/26/2022
9/29/2023
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Not Sampled
Well Not Sampled
Well Not Sampled
Well Not Sampled
Well Not Sampled
Not Sampled
MW-3
Well Not Sampled
Well Not Sampled
Well Not Sampled
Well Not Sampled
Well Could Not Be Located
Not Sampled
Not Sampled
Not Sampled
MW-4
Page 2 of 5
TABLE 7
HISTORICAL GROUNDWATER ANALYTICAL RESULTS
FORMER K&L GROCERY
2281 BEAVERDAM ROAD
ENFIELD, HALIFAX COUNTY, NORTH CAROLINA
INCIDENT #3880
Monitoring
Well
Sampling
Date
Benzene Toluene Ethylbenzene Total Xylenes MTBE Naphthalene 1,2-Dibromoethane Isopropyl Ether sec-Butylbenzene tert-Butylbenzene Isopropylbenzene n-Propylbenzene 1,2-Dichlorobenzene 1,4-Dichlorobeznene 1,2-Dichloroethane 1,1,2-Trichloroethane 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene1 600 600 500 20 6 0.02 70 70 70 70 70 20 6 0.4 0.6 400 400
5,000 260,000 80,000 50,000 20,000 6,000 50 70,000 8,800 14,750 30,500 26,100 20,000 405 400 600 28,500 24,100
2L Standard
GCL
6/17/1991 <1 <1 <1 <1 ----------------------------
2/18/1999 <1 <1 <1 <1 ----------------------------
8/22/2000 <1 <1 <1 <4 ------<1 --------<1 ----------
4/26/2001 <1 <1 <1 <4 ----<1 <1 --------<1 <1 <1 ------
7/30/2001 <1 <1 <1 <1 ----<1 <1 --------<1 <1 <1 ------
11/28/2001 0.5J 0.7J <1 <1 ----<1 <1 --------<1 <1 <1 ------
10/3/2003 <0.5 <0.5 <0.5 <1.5 --<0.5 <0.5 <0.5 <0.5 --<0.5 <0.5 <0.02 <0.5 <0.5 --<0.5 <0.5
4/29/2010
6/25/2010 <0.5 <0.5 <0.5 <1.5 <0.5 <2.0 --<0.5 <0.5 <0.5 <0.5 <1.0 --<0.5 <0.5 --<0.5 <0.5
5/17/2011
10/12/2011 ND 27.4 ND ND --ND ND ND ND ND ND ND ND ND ND ND ND ND
5/31/2012 ND ND ND ND --ND ND ND ND ND ND ND ND ND ND ND ND ND
5/18/2015
6/16/2016
12/13/2016
6/28/2018
12/17/2019
6/14/2021
8/26/2022
9/29/2023
8/22/2000 1,400 24,000 <2,000 <11,300 ------4,400 --------1,100 ----------
4/26/2001 1,700 33,000 3,500 16,600 ----<80 2,700 --------1,200 <80 <80 ------
7/30/2001 12,900 24,500 2,210 13,100 ----<1,000 2,340 --------1,160 <1,000 <1,000 ------
11/28/2001 15,100 35,200 2,190 12,800 ----<1,000 2,940 --------879J <1,000 <1,000 ------
10/3/2003 1,400 23,000 2,000 10,800 --230 <12 <12 <12 --72 200 1,300 <12 <12 --1,400 350
4/29/2010 11,300 21,400 1,980 11,650 <5.0 141 --1,330 3.4 <5.0 74.1 172 710 ------1,090 277
5/17/2011 2,480 19,000 4,530 26,350 <10.0 139 ND 10.2 <10.0 <10.0 78.2 192 <10.0 <10.0 1,530 --1,370 328
10/12/2011 3,390 11,100 1,420 12,260 --299 ND ND ND ND 102 276 ND ND 1,080 ND 1,990 660
5/31/2012 2,230 7,610 985 8,370 --ND 232 ND ND ND ND 115 ND ND 834 ND 1,300 499
5/18/2015 2,300 2,600 1,300 2,730 <2.2 270 17 <4.5 6.5J <2.4 64 170 <1.9 <1.2 420 <2.9 1,600 460
2/17/2016 9,300 19,000 2,000 10,600 <18 160 430 <36 <26 <22 64J 190 <34 <30 <39 <23 1,400 340
6/16/2016 1,900 2,700 430 3,300 <4.5 160 120 <9 <6.5 <6 18J 43 <8.5 <7.5 380 <12 530 170
12/13/2016 2,200 4,500 780 3,500 <12 81 110 <12 <12 <12 29 79 <12 <12 340 <12 620 180
6/28/2018 1,200 1,900 850 3,040 <12 330 <12 <12 5.5J <12 41 100 <12 <12 <25 <12 870 200
12/17/2019 22.8 3.9 15.1 32.1 <0.50 3.8 <0.50 <0.50 <0.50 <0.50 1.4 3.3 <0.50 <0.50 1.5 <0.30 18.5 1.3
6/14/2021 411 498 433 1,686 <25.0 64.9J <25.0 <25.0 <25.0 <25.0 23.4J 65.4 <25.0 <25.0 7.82J <25.0 441 98.7
8/26/2022 628 776 511 2,222 <25.0 58.5J <25.0 <25.0 <25.0 <25.0 25.2 45.0 <25.0 <25.0 5.40J <25.0 442 80.9
9/29/2023 901 920 770 2,818 <1.00 108 <1.00 <1.00 3.05 <1.00 33.7 105 <1.00 <1.00 14.5 <1.00 745 157
MW-6/
MW-6R
Not Sampled
Well Could Not Be Located
Well Could Not Be Located
Not Sampled
Well Could Not Be Located
Not Sampled
Not Sampled
Not Sampled
Well Could Not Be Located
Well Not SampledMW-5
Page 3 of 5
TABLE 7
HISTORICAL GROUNDWATER ANALYTICAL RESULTS
FORMER K&L GROCERY
2281 BEAVERDAM ROAD
ENFIELD, HALIFAX COUNTY, NORTH CAROLINA
INCIDENT #3880
Monitoring
Well
Sampling
Date
Benzene Toluene Ethylbenzene Total Xylenes MTBE Naphthalene 1,2-Dibromoethane Isopropyl Ether sec-Butylbenzene tert-Butylbenzene Isopropylbenzene n-Propylbenzene 1,2-Dichlorobenzene 1,4-Dichlorobeznene 1,2-Dichloroethane 1,1,2-Trichloroethane 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene1 600 600 500 20 6 0.02 70 70 70 70 70 20 6 0.4 0.6 400 400
5,000 260,000 80,000 50,000 20,000 6,000 50 70,000 8,800 14,750 30,500 26,100 20,000 405 400 600 28,500 24,100
2L Standard
GCL
8/22/2000 <1 <1 <1 <4 ------<1 --------<1 ----------
4/26/2001 <1 <1 <1 <4 ----<1 <1 --------<1 <1 <2 ------
6/29/2001 (1)ND ND ND ND ----------------------------
6/29/2001 (2)ND ND ND ND ----------------------------
7/30/2001 <1 <1 <1 <1 ----<1 <1 --------<1 <1 <1 ------
11/28/2001 0.7J 0.9J <1 <1 ----<1 <1 --------<1 0.5J 1.2 ------
10/3/2003 <0.5 <0.5 <0.5 <1.5 --<0.5 <0.5 <0.5 <0.5 --<0.5 <0.5 <0.02 <0.5 0.6 --<0.5 <0.5
4/29/2010
5/17/2011 <0.5 <0.5 <0.5 <1.5 <0.5 <2.0 --<0.5 <0.5 <0.5 <0.5 <1.0 --0.58 0.8 --<0.5 <0.5
10/12/2011 ND ND ND ND --ND ND ND ND ND ND ND ND ND ND ND ND ND
5/31/2012 ND ND ND ND --ND ND ND ND ND ND ND ND ND ND ND ND ND
5/18/2015 <0.079 <0.09 <0.092 <0.18 <0.09 <0.12 <0.089 <0.18 <0.089 <0.096 <0.11 <0.094 <0.12 <0.079 <0.046 <0.12 <0.18 <0.1
6/16/2016 <0.12 <0.17 <0.13 <0.26 <0.09 <0.12 <0.15 <0.18 <0.13 <0.12 <0.12 <0.13 <0.17 <0.15 <0.19 <0.24 <0.18 <0.13
12/13/2016 <0.50 <0.50 <0.50 <1.0 <0.50 <1.0 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
6/28/2018
12/17/2019
6/14/2021
8/26/2022
9/29/2023
8/22/2000 7,600 5,600 830 2,700 ------1,600 --------<100 ----------
4/26/2001 10,000 1,900 1,100 4,000 ----<40 1,400 --------<40 <40 <40 ------
6/29/2001 (1)10,800 1,100 768 2,590 ----------------------------
6/29/2001 (2)13,700 1,410 853 2,980 ----------------------------
7/30/2001 6,630 789 <500 2,460 ----<500 1,300 --------<500 <500 <500 ------
11/28/2001 7,220 212 517 2,190 ----<100 1,190 --------<100 <100 <100 ------
10/3/2003 7,900 330 1,000 2,400 --200 <8 <8 <8 --42 96 2.96 <8 <8 --620 200
4/29/2010 5,740 342 497 472.4 --46.7 ND 5.92 0.83 ND 19.6 41.9 ND ND 837 ND 301 77
10/12/2011 7,230 2,530 732 1,756 --90 ND 12.5 ND ND 42.9 70.8 ND ND 801 ND 331 127
5/31/2012 7,340 2,040 972 2,990 --101 ND ND ND ND 36.4 82.4 ND ND 791 ND 566 163
5/18/2015
6/16/2016
12/13/2016 6,700 100 550 540 <5.0 54 <5.0 7.9 <5.0 <5.0 28 59 <5.0 <5.0 560 <5.0 310 120
6/28/2018
12/17/2019
6/14/2021 2,400 65.7 160 229.0 <50.0 <250 <50.0 <50.0 <50.0 <50.0 13.2J 25.6J <50.0 <50.0 203 <50.0 95.0 19.6J
8/26/2022 1,760 48.0 163 237.3 <25.0 <125 <25.0 <25.0 <25.0 <25.0 9.50J 12.1J <25.0 <25.0 144 <25.0 69.4 15.5J
9/29/2023 1,090 40.2 100 267 <1.00 23.0 <1.00 4.41 0.403 J <1.00 6.62 12.8 <1.00 <1.00 255 <1.00 85.0 57.6
Not Sampled
Not Sampled
Well Could Not Be Located
Not Sampled
Not Sampled
Not Sampled
MW-8
Well Could Not Be Located
Well Could Not Be Located
Well Could Not Be Located
Well Could Not Be Located
MW-7
Page 4 of 5
TABLE 7
HISTORICAL GROUNDWATER ANALYTICAL RESULTS
FORMER K&L GROCERY
2281 BEAVERDAM ROAD
ENFIELD, HALIFAX COUNTY, NORTH CAROLINA
INCIDENT #3880
Monitoring
Well
Sampling
Date
Benzene Toluene Ethylbenzene Total Xylenes MTBE Naphthalene 1,2-Dibromoethane Isopropyl Ether sec-Butylbenzene tert-Butylbenzene Isopropylbenzene n-Propylbenzene 1,2-Dichlorobenzene 1,4-Dichlorobeznene 1,2-Dichloroethane 1,1,2-Trichloroethane 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene1 600 600 500 20 6 0.02 70 70 70 70 70 20 6 0.4 0.6 400 400
5,000 260,000 80,000 50,000 20,000 6,000 50 70,000 8,800 14,750 30,500 26,100 20,000 405 400 600 28,500 24,100
2L Standard
GCL
10/12/2011 12,500 25,800 3,000 18,780 --500 ND ND 9.81 ND 225 332 ND ND 1,590 22.1 2,150 631
5/31/2012 5,830 14,800 1,840 12,920 --222 294 ND ND ND 69.1 177 ND ND 905 ND 1,500 360
5/18/2015 2,200 9,200 2,300 15,000 <9 <12 130 <18 <8.4 <9.6 100 270 <7.6 <4.6 330 <12 2,800 640
2/17/2016 760 1,300 820 4,500 17 160 <3 <4.5 12 <2.8 59 170 <4.2 <3.8 <4.8 <2.9 1,600 450
6/16/2016 170 310 57 350 <0.9 14 20 <0.18 <1.3 <0.12 3.6J 8.5 <0.17 <1.5 49 <0.24 52 16
12/13/2016 85 52 25 147 <0.50 4.7 5.5 0.44J 0.35J <0.50 1.6 3.9 <0.50 <0.50 30 <0.50 51 16
6/28/2018 180 14 120 122 <0.50 44 0.43J <0.50 1.8 <0.50 15 36 <0.50 <0.50 19 <0.50 190 8.6
12/17/2019 74.9 12.4 54.0 41.5 <0.50 15.5 <0.50 <0.50 0.82 <0.50 6.2 13.4 <0.50 <0.50 9.8 <0.30 52.4 2.6
6/14/2021
8/26/2022
9/29/2023 181 17.6 35.8 62.6 <1.00 13.4 0.641 J <1.00 0.510 J <1.00 4.01 8.81 <1.00 <1.00 18.0 <1.00 36.0 4.54
Notes:
1. "<" or ND = Not Detected at or above the laboratory detection limit.
2. Concentrations are reported in micrograms per liter (ug/l) = parts per billion (ppb).
3. Concentrations in bold print equal or exceed the corresponding NCDEQ Groundwater Quality 2L Standard (2L Standard) - April 2022.
4. NCDEQ = North Carolina Department of Environmental Quality.
5. NE = Not Established.
6. NA = Not Analyzed.
7. MTBE = Methyl Tertiary Butyl Ether.
8. GCL = Gross Contamination Level.
9. J = The reported value is an estimate. The identification of the analyte is acceptable.
10. -- = Not reported in historical tables.
11. Concentrations in bold italicized print equal or exceed the GCL.
Not Sampled
MW-9
Not Sampled
Page 5 of 5
K&L Grocery

ATC Project No. STL0388001 NCDEQ State Lead Program
FIGURES
2725 E. Millbrook Road, Ste 121
Raleigh, NC 27604
[phone]
PROJECT NO: STL0388001
DATE: 10/2023 REVIEWED BY: GA
K&L Grocery –Incident #3880
2281 Beaverdam Road
Enfield, Halifax County, North Carolina
SOURCE: MyTopoMap.com
SCALE: 1” = 740’
FIGURE 1: SITE TOPOGRAPHIC MAP
SITE
N
GREENERESIDENCEFORMERBARFIELDRESIDENCEFORMERK&L GROCERYFORMER550 GALLONGASOLINE USTsPROPERTY BOUNDARYBEAVERDAM ROADDRAINAGE DITCHMW-4MW-7MW-1MW-5MW-9MW-8MW-3MW-2MW-6RWSW-1(INACTIVE)AS-1
GREENERESIDENCEFORMERBARFIELDRESIDENCEFORMERK&L GROCERYFORMER550 GALLONGASOLINE USTsPROPERTY BOUNDARYBEAVERDAM ROADDRAINAGE DITCHMW-4MW-7MW-1MW-5MW-9MW-8MW-3MW-2MW-6RWSW-1(INACTIVE)AS-1NMNMNMNM111.49114.281.GROUNDWATER ELEVATIONS MEASURED ON 09/28/2023
2.FEATURES SHOWN ARE NOT AN AUTHORITATIVE
LOCATION, NOR PRESENTED TO A STATED ACCURACY 117.98115.61116.61112.00113.00114.00115.00116.00117.00
GREENERESIDENCEFORMERBARFIELDRESIDENCEFORMERK&L GROCERYFORMER550 GALLONGASOLINE USTsPROPERTY BOUNDARYBEAVERDAM ROADDRAINAGE DITCHMW-4MW-7MW-1MW-5MW-9MW-8MW-3MW-2MW-6RWSW-1(INACTIVE)AS-11.GROUNDWATER SAMPLES TAKEN 09/28/2023
2.FEATURES SHOWN ARE NOT AN AUTHORITATIVE
LOCATION, NOR PRESENTED TO A STATED ACCURACY NSNSNSNS15,8009011811,0902571
0
,
0
0
0
1,000
100
10
1
GREENERESIDENCEFORMERBARFIELDRESIDENCEFORMERK&L GROCERYFORMER550 GALLONGASOLINE USTsPROPERTY BOUNDARYBEAVERDAM ROADDRAINAGE DITCHMW-4MW-7MW-1MW-5MW-9MW-8MW-3MW-2MW-6RWSW-1(INACTIVE)AS-1NSNSNSNS4,49025.125518.014.5400
40
4
0.4
4,00
0
1.GROUNDWATER SAMPLES TAKEN 09/28/2023
2.FEATURES SHOWN ARE NOT AN AUTHORITATIVE
LOCATION, NOR PRESENTED TO A STATED ACCURACY
GREENERESIDENCEFORMERBARFIELDRESIDENCEFORMERK&L GROCERYFORMER550 GALLONGASOLINE USTsPROPERTY BOUNDARYBEAVERDAM ROADDRAINAGE DITCHMW-4MW-7MW-1MW-5MW-9MW-8MW-3MW-2MW-6RWSW-1(INACTIVE)AS-11.FEATURES SHOWN ARE NOT AN AUTHORITATIVE
LOCATION, NOR PRESENTED TO A STATED ACCURACY
2.ONLY COMPOUNDS DETECTED ABOVE 2L STANDARDS
ARE SHOWN
3.COMPOUNDS DETECTED ABOVE GROSS CONTAMINATION
LEVELS ARE SHOWN IN ITALICIZED PRINT
4.J = ESTIMATED CONCENTRATION
5.CONCENTRATIONS ARE REPORTED IN MICROGRAMS PER
LITER (µg/L)NSNSNSNS
K&L Grocery

ATC Project No. STL0388001 NCDEQ State Lead Program
APPENDIX A

CONCEPTUAL SITE MODEL
Site Name: K&L Grocery Date: 10/27/2023
Property Owner: Holly J. Keeter Last Field Event Date:9/28/2023
Site Name:K&L Grocery Release Discovery Date:9/22/2004
NCDEQ UST Incident No.:3880 Source of Release:UST System
Facility ID No.:Unregistered Estimated Volume of Release:Unknown
Risk Classification:High
Risk Rank:181D Gasoline (leaded)Unknown
Site Address:2281 Beaverdam Road Gasoline (unleaded)Unknown
Site City, ST ZIP:Enfield, North Carolina Gasoline (ethanol blend)Unknown
Site County:Halifax Diesel No
NCDEQ Regional Office:Raleigh Kerosene No
Active UST Facility:No Heating Oil (#2)No
USTs Present:No Heating Oil (>#2)No
Motor Oil No
Hydraulic Oil No
Major Soil Type:sandy silt, silty sand, clay Used Oil No
Surface Cover over impacted soil:No
Utilities within plume (Y/N/U):Yes
>S-W MSCCs (Y/N/U):Unknown
>Residential MSCCs (Y/N/U):Unknown Site (Current):Vacant
>Comm/Ind MSCCs (Y/N/U):Unknown Site (Future):Unknown
North Adjacent:Agricultural
East Adjacent:Agricultural
Litho-Tectonic Zone Coastal Plain South Adjacent:Undeveloped/Agricultural
Geologic Formation Yorktown West Adjacent:Residential
Rock Type Sedimentary rocks
Depth to Bedrock (ft bgs)Unknown Municipal Water (Y/N/U):No
Active Potable Wells <1000 ft (#/U):Yes (4 total)
Active Potable Wells <500 ft (#/U):Yes (1 total)
Depth to water (ft-bgs)Type II Well Network:
0.25-18.78 ft bgs Impacted Wells (Y/N/U):No
Gradient (ft/ft):0.015 Any wells <250 ft (Y/N/U):Yes (on-site well WSW-1)
Direction (N E S W combo):South-southwest
Hydraulic Conductivity (ft/day):Unknown <500 ft (Y/N):No
Total Porosity (%):Unknown Type of Surface Water:N/A
Effective Porosity (%):Unknown Name of Nearest Stream:Tributatry of Beaverdam Swamp located
approximately 1,300 feet west of the site
Flow Rate (ft/year):2.0 Stream Classification:
R5UBH (R - Riverine; 5 - Unknown Perennial;
UB - Unconsolidated Bottom; H -
Permanently Flooded)
COCs >2L (Y/N/U):Yes Impacted Surface Water (Y/N/U):Unknown
COCs >2L Extent Defined (Y/N):No
COCs >GCLs (Y/N/U):Yes
COCs >GCLs (Wells):MW-3 >LEL in Structures:No
COCs >GCLs Extent Defined (Y/N):No Vapors in Buildings:No
COCs >2B Standards by 10X (Y/N/U):N/A Slab-on-grade or Crawlspace:No
LNAPL (Y/N/U):N/A Dissolved VOCs <5 ft of Structures:No
LNAPL (Max Thickness ft):N/A LNAPL <15 ft of Structures:No
LNAPL (Wells):N/A Basement <30 ft of Dissolved COCs:No
LNAPL Extent Defined (Y/N):N/A
LNAPL (<5 ft beneath buildings/U):N/A
Utilities within plume (Y/N/U):Unknown
Alternative Water Source: - -
NORP: - -
Site Remediation: - -
Soil Excavation: - -
AFVR: - -
MMPE: - -
SVE/AS: - -
Other: - -
Additional Support Documentation Available / Data Gaps:
Approach (general discussion):Reduce impacted groundwater
concentrations below GCLs.
Surface Water
Land Use / Zoning
Site is currently vacant. A soil excavation was performed at the site in May 2001.
During the excavation, approximately 1,198.7 tons of soil were removed from the site
and approximately 1,620 pounds of oxygen releasing compound (ORC) were
emplaced in the bottom of the excavation pit prior to backfilling. Another soil
excavation was performed in May 2011, at which time approximately 2,211.07 tons
of petroleum-impacted soil were removed from the site.
CONCEPTUAL SITE MODEL
Soil Information
Possible Path(s) to Closure
Site Information Release Information
Petroleum Type Released
Geologic Information
Groundwater Information
Comments:
Receptor Information
Water Supply
Vapor
Page 1 of 1
K&L Grocery

ATC Project No. STL0388001 NCDEQ State Lead Program
APPENDIX B

SITE PHOTOGRAPHS

Photo 1: A view of the current site status. Photo 2: A view of the AFVR staging.
Site Photographs
K&L Grocery - Incident #3880

2281 Beaverdam Road
Enfield, Halifax County, North Carolina

2725 E. Millbrook Road, Suite 121
Raleigh, North Carolina
Tel: [phone] Fax: [phone]
Photos Taken By:
Justin Jones Site ID: Incident #3880 ATC Project No.: STL0388001

Photo 3: A view of AS-1 and MW-1 during the AFVR event. Photo 4: A view of MW-8 during the AFVR event.
Site Photographs

K&L Grocery - Incident #3880

2281 Beaverdam Road
Enfield, Halifax County, North Carolina

2725 E. Millbrook Road, Suite 121
Raleigh, North Carolina
Tel: [phone] Fax: [phone]
Photos Taken By: Justin Jones Site ID: Incident #3880 ATC Project No.: STL0388001

Photo 5: A view of AS-1 and MW-1 during the groundwater sampling event. Photo 6: A view of MW-2 during the groundwater sampling event.
Site Photographs

K&L Grocery - Incident #3880

2281 Beaverdam Road
Enfield, Halifax County, North Carolina

2725 E. Millbrook Road, Suite 121
Raleigh, North Carolina
Tel: [phone] Fax: [phone]
Photos Taken By: Justin Jones Site ID: Incident #3880 ATC Project No.: STL0388001

Photo 7: A view of MW-6R during the groundwater sampling event. Photo 8: A view of MW-8 during the groundwater sampling event.
Site Photographs

K&L Grocery - Incident #3880

2281 Beaverdam Road
Enfield, Halifax County, North Carolina

2725 E. Millbrook Road, Suite 121
Raleigh, North Carolina
Tel: [phone] Fax: [phone]
Photos Taken By: Justin Jones Site ID: Incident #3880 ATC Project No.: STL0388001

Photo 9: A view of MW-9 during the groundwater sampling event.
Site Photographs

K&L Grocery - Incident #3880

2281 Beaverdam Road
Enfield, Halifax County, North Carolina

2725 E. Millbrook Road, Suite 121
Raleigh, North Carolina
Tel: [phone] Fax: [phone]
Photos Taken By: Justin Jones Site ID: Incident #3880 ATC Project No.: STL0388001
K&L Grocery

ATC Project No. STL0388001 NCDEQ State Lead Program
APPENDIX C

FIELD NOTES
K&L Grocery

ATC Project No. STL0388001 NCDEQ State Lead Program
APPENDIX D

BORING LOG AND
WELL CONSTRUCTION RECORD – AS-1
Client: NCDEQ State Lead Program
ATC Project No. STL0388001
Enfield, Halifax County, North Carolina
2281 Beaverdam Road
K&L Grocery - Incident #3880
AIR SPARGE WELL: AS-1
(Page 1 of 1)
Date(s) Drilled : 08/22/2023
Drilling Contractor : Geologic Exploration
Drilling Method : Hand Auger
: Hollow Stem Auger
Boring Diameter : Inner Diameter = 4.25"
: Outer Diameter = 8"
Logged By : Nick Kramer
Depth In Feet0
2
4
6
8
10
12
14
16
18
20 USCSSP
ML
CL GRAPHICDESCRIPTION
Brown silty SAND; fine grained; no odor; dry
Brown sandy SILT; moist; petrol odor
Grey CLAY; petrol odor
End of boring.
Elevation: NM
Well: AS-1
Grout
Bentonite
Sand
Cover
Casing
Screen
ft bgs = feet below ground surface.
Depth to water gauged on 08/29/2023 at 18.78 feet below top of casing.
WELL CONSTRUCTION RECORD (GW-1) For Internal Use Only:
Form GW-1 North Carolina Department of Environmental Quality - Division of Water Resources Revised 6-6-2018
1.Well Contractor Information:
Well Contractor Name
NC Well Contractor Certification Number
Company Name
2.Well Construction Permit #:
List all applicable well construction permits (i.e. UIC, County, State, Variance, etc.)
3.Well Use (check well use):
Water Supply Well: □Agricultural □Municipal/Public □Geothermal (Heating/Cooling Supply) □Residential Water Supply (single) □Industrial/Commercial □Residential Water Supply (shared) □Irrigation □Wells > 100,000 GPD
Non-Water Supply Well: □Monitoring □Recovery
Injection Well: □Aquifer Recharge □Groundwater Remediation □Aquifer Storage and Recovery □Salinity Barrier □Aquifer Test □Stormwater Drainage □Experimental Technology □Subsidence Control □Geothermal (Closed Loop)□Tracer □Geothermal (Heating/Cooling Return) □Other (explain under #21 Remarks)
4. Date Well(s) Completed: Well ID#
5a. Well Location:
Facility/Owner Name Facility ID# (if applicable)
Physical Address, City, and Zip
County Parcel Identification No. (PIN)
5b. Latitude and longitude in degrees/minutes/seconds or decimal degrees:
(if well field, one lat/long is sufficient)
N W
6.Is(are) the well(s): □Permanent or □Temporary
7.Is this a repair to an existing well: □Yes or □No
If this is a repair, fill out known well construction information and explain the nature of the
repair under #21 remarks section or on the back of this form.
8. For Geoprobe/DPT or Closed-Loop Geothermal Wells having the same
construction, only 1 GW-1 is needed. Indicate TOTAL NUMBER of wells
drilled:
9. Total well depth below land surface: (ft.)
For multiple wells list all depths if different (example- 3@200’ and 2@100′)
10.Static water level below top of casing: (ft.)
If water level is above casing, use “+”
11. Borehole diameter: (in.)
12. Well construction method:
(i.e. auger, rotary, cable, direct push, etc.)
FOR WATER SUPPLY WELLS ONLY:
13a. Yield (gpm) Method of test:
13b. Disinfection type: Amount:
14. WATER ZONES
FROM TO DESCRIPTION
ft. ft.
ft. ft.
15. OUTER CASING (for multi-cased wells) OR LINER (if applicable)
FROM TO DIAMETER THICKNESS MATERIAL
ft. ft. in.
16. INNER CASING OR TUBING (geothermal closed-loop)
FROM TO DIAMETER THICKNESS MATERIAL
ft. ft. in.
ft. ft. in.
17. SCREEN
FROM TO DIAMETER SLOT SIZE THICKNESS MATERIAL
ft. ft. in.
ft. ft. in.
18. GROUT
FROM TO MATERIAL EMPLACEMENT METHOD & AMOUNT
ft. ft.
ft. ft.
ft. ft.
19. SAND/GRAVEL PACK (if applicable)
FROM TO MATERIAL EMPLACEMENT METHOD
ft. ft.
ft. ft.
20. DRILLING LOG (attach additional sheets if necessary)
FROM TO DESCRIPTION (color, hardness, soil/rock type, grain size, etc.)
ft. ft.
ft. ft.
ft. ft.
ft. ft.
ft. ft.
ft. ft.
ft. ft.
21. REMARKS
22.Certification:
Signature of Certified Well Contractor Date
By signing this form, I hereby certify that the well(s) was (were) constructed in accordance with
15A NCAC 02C .0100 or 15A NCAC 02C .0200 Well Construction Standards and that a copy
of this record has been provided to the well owner.
23.Site diagram or additional well details:
You may use the back of this page to provide additional wellconstructioninfo(add'SeeOver'inRemarksBox).Youmayalsoattachadditionalpagesifnecessary.
24.SUBMITTAL INSTRUCTIONS
Submit this GW-1 within 30 days of well completion per the following:
24a. For All Wells: Original form to Division of Water Resources (DWR),
Information Processing Unit, 1617 MSC, Raleigh, NC 27699-1617
24b. For Injection Wells: Copy to DWR, Underground Injection Control (IUC)
Program, 1636 MSC, Raleigh, NC 27699-1636
24c. For Water Supply and Open-Loop Geothermal Return Wells:Copy to the
county environmental health department of the county where installed
24d. For Water Wells producing over 100,000 GPD:Copy to DWR, CCPCUA
Permit Program, 1611 MSC, Raleigh, NC 27699-1611
DAVID HALL
A - 4459
GEOLOGIC EXPLORATION
WI0501118
0.0 15.0 SCH 40
15.0 20.0 .010
0.0 PORTLAND BENTONITE
13.0 20-40
0.0 SANDY CLAY 08/22/23 AS-1
K&L GROCERY
2281 BEAVERDAM ROAD ENFIELD 27823
HALIFAX BENTONITE SEAL ~ 10.0 - 13.0 FEET
36° 14' 04.88" 77° 41' 59.46"08/24/23
20.0
8.0
8.0
AUGER
PVC
SCH 40 PVC
2.0

2.0
10.0
20.0
20.0
FINE SILICA SAND
SLURRY
K&L Grocery

ATC Project No. STL0388001 NCDEQ State Lead Program
APPENDIX E

NOTICE OF INTENT AND INJECTION EVENT RECORD
2725 East Millbrook Road
Suite 121
Raleigh, NC 27604
Tel: [phone]
Fax: [phone]
www.atcgroupservices.com
N.C. Engineering License No. C-1598

July 25, 2023

Mr. Tyler Clark
Raleigh Regional Office
North Carolina Department of Environmental Quality
Water Quality Regional Operations Section
1628 Mail Service Center
Raleigh, North Carolina 27699-1628

Reference: Notice of Intent to Construct or Operate Injection Wells
Former K&L Grocery
2281 Beaverdam Road
Enfield, Halifax County, North Carolina
NCDEQ Incident No. 3880

Dear Mr. Clark:

ATC Associates of North Carolina, P.C. (ATC) has prepared the enclosed Notice of Intent to
Construct or Operate Injection Wells on behalf of NCDEQ State Lead Program. The permit
application covers injection of air through one existing air injection well at the K&L Grocery site
located at 2281 Beaverdam Road in Enfield, North Carolina.

If you have questions or require additional information, please contact our office at (919) 871-
0999.

Sincerely,
ATC Associates of North Carolina, P.C.

Nicholas Kramer Gabriel Araos, P.E.
Project Scientist Program Manager
Direct Line: 919-573-1198 Direct Line: 919-573-1205
Email: [e-mail] Email: [e-mail]

Attachments
UIC/In Situ Remed. Notification (Revised 3/2/2015) Page 1
NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES

Print Clearly or Type Information. Illegible Submittals Will Be Returned As Incomplete.

DATE: July 25, 2023 PERMIT NO. (to be filled in by DWR)

A. WELL TYPE TO BE CONSTRUCTED OR OPERATED

(1) X Air Injection Well……………………………..…Complete sections B-F, K, N
(2) Aquifer Test Well……………………….………..Complete sections B-F, K, N
(3) Passive Injection System…………………..……..Complete sections B-F, H-N
(4) Small-Scale Injection Operation………………….Complete sections B-N
(5) Pilot Test………………………………………….Complete sections B-N
(6) Tracer Injection Well………………………….….Complete sections B-N

B. STATUS OF WELL OWNER: Business/Organization

C. WELL OWNER – State name of entity and name of person delegated authority to sign on behalf of the business
or agency:

Name(s): NCDEQ – State Lead Program
Mailing Address: 1646 Mail Service Center
City: Raleigh State: NC Zip Code: 27699 County: Wake
Day Tele No.: 919-522-7955 Cell No.: Not Available
EMAIL Address: [e-mail] Fax No.:
NOTIFICATION OF INTENT TO CONSTRUCT OR OPERATE INJECTION WELLS

The following are “permitted by rule” and do not require an individual permit when constructed in accordance
with the rules of 15A NCAC 02C .0200. This form shall be submitted at least 2 weeks prior to injection.

AQUIFER TEST WELLS (15A NCAC 02C .0220)
These wells are used to inject uncontaminated fluid into an aquifer to determine aquifer hydraulic characteristics.

IN SITU REMEDIATION (15A NCAC 02C .0225) or TRACER WELLS (15A NCAC 02C .0229):
1) Passive Injection Systems - In-well delivery systems to diffuse injectants into the subsurface. Examples include
ORC socks, iSOC systems, and other gas infusion methods.

2) Small-Scale Injection Operations – Injection wells located within a land surface area not to exceed 10,000
square feet for the purpose of soil or groundwater remediation or tracer tests. An individual permit shall be required
for test or treatment areas exceeding 10,000 square feet.

3) Pilot Tests - Preliminary studies conducted for the purpose of evaluating the technical feasibility of a
remediation strategy in order to develop a full scale remediation plan for future implementation, and where the
surface area of the injection zone wells are located within an area that does not exceed five percent of the land
surface above the known extent of groundwater contamination. An individual permit shall be required to conduct
more than one pilot test on any separate groundwater contaminant plume.

4) Air Injection Wells - Used to inject ambient air to enhance in-situ treatment of soil or groundwater.

UIC/In Situ Remed. Notification (Revised 3/2/2015) Page 2
D. PROPERTY OWNER (if different than well owner)
Name: Holley Keeter White
Mailing Address: 110 Line Boat Lane
City: Swansboro State: _NC__ Zip Code: 28584 County: Halifax
Day Tele No.: 910-545-3083 Cell No.: Not Available
EMAIL Address: Not Available Fax No.: Not Available

E. PROJECT CONTACT - Person who can answer technical questions about the proposed injection project.

Name: Nicholas Kramer – ATC Associates of North Carolina, P.C.
Mailing Address: 2725 E. Millbrook Road, Suite 121
City: Raleigh State: _NC__ Zip Code: 27604 County: Wake
Day Tele No.: 919-573-1198 Cell No.: 919-820-7051
EMAIL Address: [e-mail] Fax No.: 919-871-0335

F. PHYSICAL LOCATION OF WELL SITE

(1) Physical Address: 2281 Beaverdam Road County: Halifax
City: Enfield State: NC Zip Code: 27823
(2) Geographic Coordinates: Latitude**: __o ′ ____″ or 36.23491 N
Longitude**: __o ′ _______ ″ or 77.69996 W
Reference Datum: WGS84 Accuracy: Not Available
Method of Collection: Google Earth
**FOR AIR INJECTION AND AQUIFER TEST WELLS ONLY: A FACILITY SITE MAP WITH PROPERTY
BOUNDARIES MAY BE SUBMITTED IN LIEU OF GEOGRAPHIC COORDINATES.

G. TREATMENT AREA

Land surface area of contaminant plume: square feet
Land surface area of inj. well network: square feet (< 10,000 ft2 for small-scale injections)
Percent of contaminant plume area to be treated: (must be < 5% of plume for pilot test injections)

H. INJECTION ZONE MAPS – Attach the following to the notification.

(1) Contaminant plume map(s) with isoconcentration lines that show the horizontal extent of the
contaminant plume in soil and groundwater, existing and proposed monitoring wells, and existing and
proposed injection wells; and
(2) Cross-section(s) to the known or projected depth of contamination that show the horizontal and vertical
extent of the contaminant plume in soil and groundwater, changes in lithology, existing and proposed
monitoring wells, and existing and proposed injection wells.
(3) Potentiometric surface map(s) indicating the rate and direction of groundwater movement, plus existing
and proposed wells.

UIC/In Situ Remed. Notification (Revised 3/2/2015) Page 3
I. DESCRIPTION OF PROPOSED INJECTION ACTIVITIES – Provide a brief narrative regarding the
purpose, scope, and goals of the proposed injection activity. This should include the rate, volume, and duration
of injection over time.
_________________________________________________________________________________
_________________________________________________________________________________
_________________________________________________________________________________
_________________________________________________________________________________
_________________________________________________________________________________
_________________________________________________________________________________

J. INJECTANTS – Provide a MSDS and the following for each injectant. Attach additional sheets if necessary.

NOTE: Approved injectants (tracers and remediation additives) can be found online at
http://portal.ncdenr.org/web/wq/aps/gwpro. All other substances must be reviewed by the Division of Public
Health, Department of Health and Human Services. Contact the UIC Program for more info (919-807-6496).

Injectant:
Volume of injectant:
Concentration at point of injection:
Percent if in a mixture with other injectants:

Injectant:
Volume of injectant:
Concentration at point of injection:
Percent if in a mixture with other injectants:

Injectant:
Volume of injectant:
Concentration at point of injection:
Percent if in a mixture with other injectants:

K. WELL CONSTRUCTION DATA

(1) Number of injection wells: 1 Proposed Existing
(2) Provide well construction details for each injection well in a diagram or table format. A single
diagram or line in a table can be used for multiple wells with the same construction details. Well
construction details shall include the following:
(a) well type as permanent, direct-push, or subsurface distribution system (infiltration gallery)
(b) depth below land surface of grout, screen, and casing intervals
(c) well contractor name and certification number

UIC/In Situ Remed. Notification (Revised 3/2/2015) Page 4
L. SCHEDULES – Briefly describe the schedule for well construction and injection activities.

_________________________________________________________________________________

M. MONITORING PLAN – Describe below or in separate attachment a monitoring plan to be used to determine
if violations of groundwater quality standards specified in Subchapter 02L result from the injection activity.

_________________________________________________________________________________

N. SIGNATURE OF APPLICANT AND PROPERTY OWNER

APPLICANT: “I hereby certify, under penalty of law, that I am familiar with the information submitted in this
document and all attachments thereto and that, based on my inquiry of those individuals immediately responsible
for obtaining said information, I believe that the information is true, accurate and complete. I am aware that
there are significant penalties, including the possibility of fines and imprisonment, for submitting false
information. I agree to construct, operate, maintain, repair, and if applicable, abandon the injection well and
all related appurtenances in accordance with the 15A NCAC 02C 0200 Rules.”

,on behalf of NCDEQ Nicholas Kramer, on behalf of NCDEQ
Signature of Applicant Print or Type Full Name

PROPERTY OWNER (if the property is not owned by the permit applicant):
“As owner of the property on which the injection well(s) are to be constructed and operated, I hereby consent to
allow the applicant to construct each injection well as outlined in this application and agree that it shall be the
responsibility of the applicant to ensure that the injection well(s) conform to the Well Construction Standards
(15A NCAC 02C .0200).”

“Owner” means any person who holds the fee or other property rights in the well being constructed. A well
is real property and its construction on land shall be deemed to vest ownership in the land owner, in the
absence of contrary agreement in writing.

See attached access agreement Holley Keeter White
Signature* of Property Owner (if different from applicant) Print or Type Full Name
* An access agreement between the applicant and property owner may be submitted in lieu of a signature on this form.

Submit the completed notification package to:

DWR – UIC Program
1636 Mail Service Center
Raleigh, NC 27699-1636
Telephone: [phone]
1,000
100
10
1
40
4
0.4
400
PERMANENT AIR SPRAGE WELL CONSTRUCTION DETAILS
FLUSH GRADE MANHOLE
CROSS SECTIONAL VIEW
(NOT TO SCALE)
LOCKABLE WELL CAP PROTECTIVE CASING AND CONCRETE PAD
L1 CASING MATERIAL steel
CASING DIAMETER 8 inches
CASING LENGTH 12 inches
PAD DIMENSIONS 2 feet x 2 feet
HEIGHT ABOVE GROUND flush mounted
WELL CASING
MATERIAL sch 40 PVC
DIAMETER 2 inches
JOINT TYPE flush threaded
LENGTH 15 feet
L2 BACKFILL AROUND CASING
MATERIAL cement grout
THICKNESS 10 feet
SEAL
TYPE OF SEAL bentonite
L4 THICKNESS 3 feet
FILTER PACK
TYPE OF FILTER #2 silica sand
DISTANCE ABOVE SCREEN 2 feet
TOTAL FILTER PACK FOOTAGE 7 feet
WELL SCREEN
L3 SCREEN MATERIAL sch 40 PVC
DIAMETER 2 inches
LENGTH 5 feet
SLOT SIZE 0.010 inches
DEPTH TO BOTTOM OF
WELL 20 feet
DEPTH TO BOTTOM OF
BOREHOLE 20 feet
L1 =0 FT.
L2 =15 FT.DIAMETER OF BOREHOLE 6 inches
L3 =5 FT.
L4 =20 FT.DRILLING SUBCONTRACTOR: Geologic Exploration
DRILLER ADDRESS: 176 Commerce Blvd, Statesville, NC 28625
DRILLER CERTIFICATION #: 4475
TITLE Well Information
AS-1
Former K&L Grocery
2281 Beaverdam Road 2725 East Millbrook Road, Suite 121
Enfield, North Carolina Raleigh, North Carolina 27604
FILE PREP. BY REV. BY DATE
NK GA 7/25/2023
2725 East Millbrook Road
Suite 121
Raleigh, NC 27604
Tel: [phone]
Fax: [phone]
www.atcgroupservices.com
N.C. Engineering License No. C-1598

September 6, 2022

Mr. Michael Hall
Raleigh Regional Office
North Carolina Department of Environmental Quality
Water Quality Regional Operations Section
1628 Mail Service Center
Raleigh, North Carolina 27699-1628

Reference: Injection Event Record – Permit # WI0600236
Former K&L Grocery
2281 Beaverdam Road
Enfield, Halifax County, North Carolina
NCDEQ Incident No. 3880

Dear Mr. Hall:

ATC Associates of North Carolina, P.C. (ATC) is submitting an Injection Event Record for the
Former K&L Grocery site on behalf of the North Carolina Department of Environmental Quality
State Lead Program. The record documents an air sparge event on well AS-1 associated with
the above referenced site.

If you have questions or require additional information, please contact our office at [phone].

Sincerely,
ATC Associates of North Carolina, P.C.

Nicholas Kramer Gabriel Araos, P.E.
Project Scientist Program Manager
Direct Line: 919-573-1198 Direct Line: 919-573-1205
Email: [e-mail] Email: [e-mail]

cc: Linda Blalock

Attachments

Injection Event Record
Former K&L Grocery, Enfield, North Carolina

INJECTION EVENT RECORD

Submit the original of this form to the Division of Water Resources within 30 days of injection. Form UIC-IER
Attn: UIC Program, 1636 Mail Service Center, Raleigh, NC 27699-1636, Phone No. 919-807-6464 Rev. 3-1-2016
North Carolina Department of Environmental Quality – Division of Water Resources
INJECTION EVENT RECORD (IER)

Permit Number WI0501118

1. Permit Information

NCDEQ
Permittee

Former K&L Grocery
Facility Name

2281 Beaverdam Road, Enfield, Halifax County, NC
Facility Address (include County)

2. Injection Contractor Information

ATC Associates of NC, P.C.
Injection Contractor / Company Name

Street Address 2725 E. Millbrook Road, Ste 121

Raleigh NC 27604
City State Zip Code

[phone]
Area code – Phone number

3. Well Information

Number of wells used for injection 1

Well IDs AS-1

Were any new wells installed during this injection
event?
Yes No

If yes, please provide the following information:

Number of Monitoring Wells _______________

Number of Injection Wells__________________

Type of Well Installed (Check applicable type):
Bored Drilled Direct-Push
Hand-Augured Other (specify) ________

Please include a copy of the GW-1 form for each
well installed.

Concentration Not Applicable

If the injectant is diluted please indicate the source
dilution fluid. Not Applicable

Total Volume Injected (gal) Not Applicable

Volume Injected per well (gal) Not Applicable

5. Injection History

Injection date(s)__August 29, 2023

Injection number (e.g. 3 of 5)__1 of 1____________

Is this the last injection at this site?
Yes No

I DO HEREBY CERTIFY THAT ALL THE
INFORMATION ON THIS FORM IS CORRECT TO
THE BEST OF MY KNOWLEDGE AND THAT THE
INJECTION WAS PERFORMED WITHIN THE
STANDARDS LAID OUT IN THE PERMIT.

__________________________09/06/2023_____
SIGNATURE OF INJECTION CONTRACTOR DATE
ATC Associates of North Carolina, P.C.
PRINT NAME OF PERSON PERFORMING THE INJECTION
if necessary
Injectant(s) Type (can use separate additional sheets
Continuous Air
4. Injectant Information
abandoned.
Please include a copy of the GW-30 for each well
Number of Injection Wells__________________
Number of Monitoring Wells _______________
If yes, please provide the following information:
Yes No
event?
Were any wells abandoned during this injection
WELL CONSTRUCTION RECORD (GW-1) For Internal Use Only:
Form GW-1 North Carolina Department of Environmental Quality - Division of Water Resources Revised 6-6-2018
1.Well Contractor Information:
Well Contractor Name
NC Well Contractor Certification Number
Company Name
2.Well Construction Permit #:
List all applicable well construction permits (i.e. UIC, County, State, Variance, etc.)
3.Well Use (check well use):
Water Supply Well: □Agricultural □Municipal/Public □Geothermal (Heating/Cooling Supply) □Residential Water Supply (single) □Industrial/Commercial □Residential Water Supply (shared) □Irrigation □Wells > 100,000 GPD
Non-Water Supply Well: □Monitoring □Recovery
Injection Well: □Aquifer Recharge □Groundwater Remediation □Aquifer Storage and Recovery □Salinity Barrier □Aquifer Test □Stormwater Drainage □Experimental Technology □Subsidence Control □Geothermal (Closed Loop)□Tracer □Geothermal (Heating/Cooling Return) □Other (explain under #21 Remarks)
4. Date Well(s) Completed: Well ID#
5a. Well Location:
Facility/Owner Name Facility ID# (if applicable)
Physical Address, City, and Zip
County Parcel Identification No. (PIN)
5b. Latitude and longitude in degrees/minutes/seconds or decimal degrees:
(if well field, one lat/long is sufficient)
N W
6.Is(are) the well(s): □Permanent or □Temporary
7.Is this a repair to an existing well: □Yes or □No
If this is a repair, fill out known well construction information and explain the nature of the
repair under #21 remarks section or on the back of this form.
8. For Geoprobe/DPT or Closed-Loop Geothermal Wells having the same
construction, only 1 GW-1 is needed. Indicate TOTAL NUMBER of wells
drilled:
9. Total well depth below land surface: (ft.)
For multiple wells list all depths if different (example- 3@200’ and 2@100′)
10.Static water level below top of casing: (ft.)
If water level is above casing, use “+”
11. Borehole diameter: (in.)
12. Well construction method:
(i.e. auger, rotary, cable, direct push, etc.)
FOR WATER SUPPLY WELLS ONLY:
13a. Yield (gpm) Method of test:
13b. Disinfection type: Amount:
14. WATER ZONES
FROM TO DESCRIPTION
ft. ft.
ft. ft.
15. OUTER CASING (for multi-cased wells) OR LINER (if applicable)
FROM TO DIAMETER THICKNESS MATERIAL
ft. ft. in.
16. INNER CASING OR TUBING (geothermal closed-loop)
FROM TO DIAMETER THICKNESS MATERIAL
ft. ft. in.
ft. ft. in.
17. SCREEN
FROM TO DIAMETER SLOT SIZE THICKNESS MATERIAL
ft. ft. in.
ft. ft. in.
18. GROUT
FROM TO MATERIAL EMPLACEMENT METHOD & AMOUNT
ft. ft.
ft. ft.
ft. ft.
19. SAND/GRAVEL PACK (if applicable)
FROM TO MATERIAL EMPLACEMENT METHOD
ft. ft.
ft. ft.
20. DRILLING LOG (attach additional sheets if necessary)
FROM TO DESCRIPTION (color, hardness, soil/rock type, grain size, etc.)
ft. ft.
ft. ft.
ft. ft.
ft. ft.
ft. ft.
ft. ft.
ft. ft.
21. REMARKS
22.Certification:
Signature of Certified Well Contractor Date
By signing this form, I hereby certify that the well(s) was (were) constructed in accordance with
15A NCAC 02C .0100 or 15A NCAC 02C .0200 Well Construction Standards and that a copy
of this record has been provided to the well owner.
23.Site diagram or additional well details:
You may use the back of this page to provide additional wellconstructioninfo(add'SeeOver'inRemarksBox).Youmayalsoattachadditionalpagesifnecessary.
24.SUBMITTAL INSTRUCTIONS
Submit this GW-1 within 30 days of well completion per the following:
24a. For All Wells: Original form to Division of Water Resources (DWR),
Information Processing Unit, 1617 MSC, Raleigh, NC 27699-1617
24b. For Injection Wells: Copy to DWR, Underground Injection Control (IUC)
Program, 1636 MSC, Raleigh, NC 27699-1636
24c. For Water Supply and Open-Loop Geothermal Return Wells:Copy to the
county environmental health department of the county where installed
24d. For Water Wells producing over 100,000 GPD:Copy to DWR, CCPCUA
Permit Program, 1611 MSC, Raleigh, NC 27699-1611
DAVID HALL
A - 4459
GEOLOGIC EXPLORATION
WI0501118
0.0 15.0 SCH 40
15.0 20.0 .010
0.0 PORTLAND BENTONITE
13.0 20-40
0.0 SANDY CLAY 08/22/23 AS-1
K&L GROCERY
2281 BEAVERDAM ROAD ENFIELD 27823
HALIFAX BENTONITE SEAL ~ 10.0 - 13.0 FEET
36° 14' 04.88" 77° 41' 59.46"08/24/23
20.0
8.0
8.0
AUGER
PVC
SCH 40 PVC
2.0

2.0
10.0
20.0
20.0
FINE SILICA SAND
SLURRY
K&L Grocery

ATC Project No. STL0388001 NCDEQ State Lead Program
APPENDIX F

WASTE DISPOSAL MANIFEST
K&L Grocery

ATC Project No. STL0388001 NCDEQ State Lead Program
APPENDIX G

LABORATORY ANALYTICAL RESULTS
ANALYTICAL REPORT
October 19, 2023
Revised Report
ATC Group Services LLC
Sample Delivery Group:L1662774
Samples Received:10/04/2023
Project Number:
Description:Former K&L Grocery
Report To:Nicholas Kramer
2725 E. Millbrook Road, Ste 121
Raleigh, NC 27604
Entire Report Reviewed By:
October 19, 2023
[Preliminary Report]
Heather J Wagner
Project Manager
Results relate only to the items tested or calibrated and are reported as rounded values. This test report shall not be reproduced, except in full, without written approval of the laboratory. Where applicable, sampling conducted by Pace Analytical National is performed per guidance provided in laboratory standard operating procedures ENV-SOP-MTJL-0067 and ENV-SOP-MTJL-0068. Where sampling conducted by the customer, results relate to the accuracy of the information provided, and as the samples are received.
Pace Analytical National
12065 Lebanon Rd Mount Juliet, TN 37122 615-758-5858 800-767-5859 www.pacenational.com
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
ATC Group Services LLC L1662774 10/19/23 15:20 1 of 36
October 19, 2023
Heather J Wagner
Project Manager
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
ATC Group Services LLC L1662774 10/19/23 15:38 1 of 36
TABLE OF CONTENTS
Cp: Cover Page 1
Tc: Table of Contents 2
Ss: Sample Summary 3
Cn: Case Narrative 4
Sr: Sample Results 5
MW-1 L1662774-01 5
MW-2 L1662774-02 7
MW-6R L1662774-03 9
MW-8 L1662774-04 11
MW-9 L1662774-05 13
FB-1 L1662774-06 15
Qc: Quality Control Summary 17
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 17
Gl: Glossary of Terms 34
Al: Accreditations & Locations 35
Sc: Sample Chain of Custody 36
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
ATC Group Services LLC L1662774 10/19/23 15:20 2 of 36
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
ATC Group Services LLC L1662774 10/19/23 15:38 2 of 36
SAMPLE SUMMARY
Collected by Collected date/time Received date/time
MW-1 L1662774-01 GW Justin Jones 09/29/23 13:30 10/04/23 09:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 WG2149587 500 10/11/23 23:16 10/11/23 23:16 JCP Mt. Juliet, TN
Collected by Collected date/time Received date/time
MW-2 L1662774-02 GW Justin Jones 09/29/23 12:30 10/04/23 09:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 WG2149587 1 10/11/23 22:55 10/11/23 22:55 JCP Mt. Juliet, TN
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 WG2150096 10 10/12/23 17:27 10/12/23 17:27 ACG Mt. Juliet, TN
Collected by Collected date/time Received date/time
MW-6R L1662774-03 GW Justin Jones 09/29/23 12:45 10/04/23 09:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 WG2147488 1 10/08/23 21:56 10/08/23 21:56 JCP Mt. Juliet, TN
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 WG2148104 20 10/10/23 07:39 10/10/23 07:39 JBE Mt. Juliet, TN
Collected by Collected date/time Received date/time
MW-8 L1662774-04 GW Justin Jones 09/29/23 13:15 10/04/23 09:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 WG2147488 1 10/08/23 22:18 10/08/23 22:18 JCP Mt. Juliet, TN
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 WG2148104 25 10/10/23 08:01 10/10/23 08:01 JBE Mt. Juliet, TN
Collected by Collected date/time Received date/time
MW-9 L1662774-05 GW Justin Jones 09/29/23 13:00 10/04/23 09:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 WG2147488 1 10/08/23 22:39 10/08/23 22:39 JCP Mt. Juliet, TN
Collected by Collected date/time Received date/time
FB-1 L1662774-06 GW Justin Jones 09/29/23 13:35 10/04/23 09:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 WG2146827 1 10/07/23 05:59 10/07/23 05:59 JHH Mt. Juliet, TN
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 WG2150753 1 10/13/23 20:58 10/13/23 20:58 ADM Mt. Juliet, TN
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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CASE NARRATIVE
All sample aliquots were received at the correct temperature, in the proper containers, with the
appropriate preservatives, and within method specified holding times, unless qualified or notated within
the report. Where applicable, all MDL (LOD) and RDL (LOQ) values reported for environmental samples
have been corrected for the dilution factor used in the analysis. All Method and Batch Quality Control
are within established criteria except where addressed in this case narrative, a non-conformance form
or properly qualified within the sample results. By my digital signature below, I affirm to the best of my
knowledge, all problems/anomalies observed by the laboratory as having the potential to affect the
quality of the data have been identified by the laboratory, and no information or data have been
knowingly withheld that would affect the quality of the data.
[Preliminary Report]
Heather J Wagner
Project Manager
Report Revision History
Level II Report - Version 1: 10/17/23 14:09
Project Narrative
Revised Report: Revised to correct sample ID MW-1 (L1662774-01). This report replaces the report issued 10/17/2023.
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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Heather J Wagner
Project Manager
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SAMPLE RESULTS - 01
L1662774
MW-1
Collected date/time: 09/29/23 13:30
Volatile Organic Compounds (GC/MS) by Method 6200B-2011
Result Qualifier MDL RDL Dilution Analysis Batch
Analyte ug/l ug/l ug/l date / time
Acetone U 5650 25000 500 10/11/2023 23:16 WG2149587
Acrolein U 1270 25000 500 10/11/2023 23:16 WG2149587
Acrylonitrile U 336 5000 500 10/11/2023 23:16 WG2149587
Benzene 15800 47.1 500 500 10/11/2023 23:16 WG2149587
Bromobenzene U 59.0 500 500 10/11/2023 23:16 WG2149587
Bromodichloromethane U 68.0 500 500 10/11/2023 23:16 WG2149587
Bromoform U 64.5 500 500 10/11/2023 23:16 WG2149587
Bromomethane U 303 2500 500 10/11/2023 23:16 WG2149587
n-Butylbenzene U 78.5 500 500 10/11/2023 23:16 WG2149587
sec-Butylbenzene U 62.5 500 500 10/11/2023 23:16 WG2149587
tert-Butylbenzene U 63.5 500 500 10/11/2023 23:16 WG2149587
Carbon tetrachloride U 64.0 500 500 10/11/2023 23:16 WG2149587
Chlorobenzene U 58.0 500 500 10/11/2023 23:16 WG2149587
Chlorodibromomethane U 70.0 500 500 10/11/2023 23:16 WG2149587
Chloroethane U 96.0 2500 500 10/11/2023 23:16 WG2149587
Chloroform U 55.5 2500 500 10/11/2023 23:16 WG2149587
Chloromethane U 480 1250 500 10/11/2023 23:16 WG2149587
2-Chlorotoluene U 53.0 500 500 10/11/2023 23:16 WG2149587
4-Chlorotoluene U 57.0 500 500 10/11/2023 23:16 WG2149587
1,2-Dibromo-3-Chloropropane U 138 2500 500 10/11/2023 23:16 WG2149587
1,2-Dibromoethane 1130 63.0 500 500 10/11/2023 23:16 WG2149587
Dibromomethane U 61.0 500 500 10/11/2023 23:16 WG2149587
1,2-Dichlorobenzene U 53.5 500 500 10/11/2023 23:16 WG2149587
1,3-Dichlorobenzene U 55.0 500 500 10/11/2023 23:16 WG2149587
1,4-Dichlorobenzene U 60.0 500 500 10/11/2023 23:16 WG2149587
Dichlorodifluoromethane U 187 2500 500 10/11/2023 23:16 WG2149587
1,1-Dichloroethane U 50.0 500 500 10/11/2023 23:16 WG2149587
1,2-Dichloroethane 4490 40.9 500 500 10/11/2023 23:16 WG2149587
1,1-Dichloroethene U 94.0 500 500 10/11/2023 23:16 WG2149587
cis-1,2-Dichloroethene U 63.0 500 500 10/11/2023 23:16 WG2149587
trans-1,2-Dichloroethene U 74.5 500 500 10/11/2023 23:16 WG2149587
1,2-Dichloropropane U 74.5 500 500 10/11/2023 23:16 WG2149587
1,1-Dichloropropene U 71.0 500 500 10/11/2023 23:16 WG2149587
1,3-Dichloropropane U 55.0 500 500 10/11/2023 23:16 WG2149587
2,2-Dichloropropane U 80.5 500 500 10/11/2023 23:16 WG2149587
Di-isopropyl ether U 52.5 500 500 10/11/2023 23:16 WG2149587
Ethylbenzene 3800 68.5 500 500 10/11/2023 23:16 WG2149587
Hexachloro-1,3-butadiene U 169 500 500 10/11/2023 23:16 WG2149587
Isopropylbenzene 214 J 52.5 500 500 10/11/2023 23:16 WG2149587
p-Isopropyltoluene U 60.0 500 500 10/11/2023 23:16 WG2149587
2-Butanone (MEK)U 595 5000 500 10/11/2023 23:16 WG2149587
Methylene Chloride U 215 2500 500 10/11/2023 23:16 WG2149587
4-Methyl-2-pentanone (MIBK)U 239 5000 500 10/11/2023 23:16 WG2149587
Methyl tert-butyl ether U 50.5 500 500 10/11/2023 23:16 WG2149587
Naphthalene 910 C4 J 500 2500 500 10/11/2023 23:16 WG2149587
n-Propylbenzene 435 J 49.7 500 500 10/11/2023 23:16 WG2149587
Styrene U 59.0 500 500 10/11/2023 23:16 WG2149587
1,1,1,2-Tetrachloroethane U 73.5 500 500 10/11/2023 23:16 WG2149587
1,1,2,2-Tetrachloroethane U 66.5 500 500 10/11/2023 23:16 WG2149587
Tetrachloroethene U 150 500 500 10/11/2023 23:16 WG2149587
Toluene 34100 139 500 500 10/11/2023 23:16 WG2149587
1,2,3-Trichlorobenzene U 115 500 500 10/11/2023 23:16 WG2149587
1,2,4-Trichlorobenzene U 241 500 500 10/11/2023 23:16 WG2149587
1,1,1-Trichloroethane U 74.5 500 500 10/11/2023 23:16 WG2149587
1,1,2-Trichloroethane U 79.0 500 500 10/11/2023 23:16 WG2149587
Trichloroethene U 95.0 500 500 10/11/2023 23:16 WG2149587
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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SAMPLE RESULTS - 01
L1662774
MW-1
Collected date/time: 09/29/23 13:30
Volatile Organic Compounds (GC/MS) by Method 6200B-2011
Result Qualifier MDL RDL Dilution Analysis Batch
Analyte ug/l ug/l ug/l date / time
Trichlorofluoromethane U 80.0 2500 500 10/11/2023 23:16 WG2149587
1,2,3-Trichloropropane U 119 1250 500 10/11/2023 23:16 WG2149587
1,2,4-Trimethylbenzene 2510 161 500 500 10/11/2023 23:16 WG2149587
1,3,5-Trimethylbenzene 675 52.0 500 500 10/11/2023 23:16 WG2149587
Vinyl chloride U 117 500 500 10/11/2023 23:16 WG2149587
o-Xylene 6670 87.0 500 500 10/11/2023 23:16 WG2149587
m&p-Xylenes 14700 215 1000 500 10/11/2023 23:16 WG2149587
(S) Toluene-d8 110 80.0-120 10/11/2023 23:16 WG2149587
(S) 4-Bromofluorobenzene 101 77.0-126 10/11/2023 23:16 WG2149587
(S) 1,2-Dichloroethane-d4 113 70.0-130 10/11/2023 23:16 WG2149587
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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SAMPLE RESULTS - 02
L1662774
MW-2
Collected date/time: 09/29/23 12:30
Volatile Organic Compounds (GC/MS) by Method 6200B-2011
Result Qualifier MDL RDL Dilution Analysis Batch
Analyte ug/l ug/l ug/l date / time
Acetone U 11.3 50.0 1 10/11/2023 22:55 WG2149587
Acrolein U 2.54 50.0 1 10/11/2023 22:55 WG2149587
Acrylonitrile U 0.671 10.0 1 10/11/2023 22:55 WG2149587
Benzene 257 0.941 10.0 10 10/12/2023 17:27 WG2150096
Bromobenzene U 0.118 1.00 1 10/11/2023 22:55 WG2149587
Bromodichloromethane U 0.136 1.00 1 10/11/2023 22:55 WG2149587
Bromoform U 0.129 1.00 1 10/11/2023 22:55 WG2149587
Bromomethane U 0.605 5.00 1 10/11/2023 22:55 WG2149587
n-Butylbenzene 4.60 0.157 1.00 1 10/11/2023 22:55 WG2149587
sec-Butylbenzene 4.55 0.125 1.00 1 10/11/2023 22:55 WG2149587
tert-Butylbenzene U 0.127 1.00 1 10/11/2023 22:55 WG2149587
Carbon tetrachloride U 0.128 1.00 1 10/11/2023 22:55 WG2149587
Chlorobenzene U 0.116 1.00 1 10/11/2023 22:55 WG2149587
Chlorodibromomethane U 0.140 1.00 1 10/11/2023 22:55 WG2149587
Chloroethane U 0.192 5.00 1 10/11/2023 22:55 WG2149587
Chloroform U 0.111 5.00 1 10/11/2023 22:55 WG2149587
Chloromethane U 0.960 2.50 1 10/11/2023 22:55 WG2149587
2-Chlorotoluene U 0.106 1.00 1 10/11/2023 22:55 WG2149587
4-Chlorotoluene U 0.114 1.00 1 10/11/2023 22:55 WG2149587
1,2-Dibromo-3-Chloropropane U 0.276 5.00 1 10/11/2023 22:55 WG2149587
1,2-Dibromoethane U 0.126 1.00 1 10/11/2023 22:55 WG2149587
Dibromomethane U 0.122 1.00 1 10/11/2023 22:55 WG2149587
1,2-Dichlorobenzene U 0.107 1.00 1 10/11/2023 22:55 WG2149587
1,3-Dichlorobenzene U 0.110 1.00 1 10/11/2023 22:55 WG2149587
1,4-Dichlorobenzene 0.740 J 0.120 1.00 1 10/11/2023 22:55 WG2149587
Dichlorodifluoromethane U 0.374 5.00 1 10/11/2023 22:55 WG2149587
1,1-Dichloroethane U 0.100 1.00 1 10/11/2023 22:55 WG2149587
1,2-Dichloroethane 25.1 0.0819 1.00 1 10/11/2023 22:55 WG2149587
1,1-Dichloroethene U 0.188 1.00 1 10/11/2023 22:55 WG2149587
cis-1,2-Dichloroethene U 0.126 1.00 1 10/11/2023 22:55 WG2149587
trans-1,2-Dichloroethene U 0.149 1.00 1 10/11/2023 22:55 WG2149587
1,2-Dichloropropane U 0.149 1.00 1 10/11/2023 22:55 WG2149587
1,1-Dichloropropene U 0.142 1.00 1 10/11/2023 22:55 WG2149587
1,3-Dichloropropane U 0.110 1.00 1 10/11/2023 22:55 WG2149587
2,2-Dichloropropane U 0.161 1.00 1 10/11/2023 22:55 WG2149587
Di-isopropyl ether U 0.105 1.00 1 10/11/2023 22:55 WG2149587
Ethylbenzene 1.03 0.137 1.00 1 10/11/2023 22:55 WG2149587
Hexachloro-1,3-butadiene U 0.337 1.00 1 10/11/2023 22:55 WG2149587
Isopropylbenzene 29.9 0.105 1.00 1 10/11/2023 22:55 WG2149587
p-Isopropyltoluene 1.27 0.120 1.00 1 10/11/2023 22:55 WG2149587
2-Butanone (MEK)U 1.19 10.0 1 10/11/2023 22:55 WG2149587
Methylene Chloride U 0.430 5.00 1 10/11/2023 22:55 WG2149587
4-Methyl-2-pentanone (MIBK)U 0.478 10.0 1 10/11/2023 22:55 WG2149587
Methyl tert-butyl ether U 0.101 1.00 1 10/11/2023 22:55 WG2149587
Naphthalene 66.2 C4 1.00 5.00 1 10/11/2023 22:55 WG2149587
n-Propylbenzene 6.77 0.0993 1.00 1 10/11/2023 22:55 WG2149587
Styrene U 0.118 1.00 1 10/11/2023 22:55 WG2149587
1,1,1,2-Tetrachloroethane U 0.147 1.00 1 10/11/2023 22:55 WG2149587
1,1,2,2-Tetrachloroethane U 0.133 1.00 1 10/11/2023 22:55 WG2149587
Tetrachloroethene U 0.300 1.00 1 10/11/2023 22:55 WG2149587
Toluene 1.48 0.278 1.00 1 10/11/2023 22:55 WG2149587
1,2,3-Trichlorobenzene U 0.230 1.00 1 10/11/2023 22:55 WG2149587
1,2,4-Trichlorobenzene U 0.481 1.00 1 10/11/2023 22:55 WG2149587
1,1,1-Trichloroethane U 0.149 1.00 1 10/11/2023 22:55 WG2149587
1,1,2-Trichloroethane U 0.158 1.00 1 10/11/2023 22:55 WG2149587
Trichloroethene U 0.190 1.00 1 10/11/2023 22:55 WG2149587
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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SAMPLE RESULTS - 02
L1662774
MW-2
Collected date/time: 09/29/23 12:30
Volatile Organic Compounds (GC/MS) by Method 6200B-2011
Result Qualifier MDL RDL Dilution Analysis Batch
Analyte ug/l ug/l ug/l date / time
Trichlorofluoromethane U 0.160 5.00 1 10/11/2023 22:55 WG2149587
1,2,3-Trichloropropane U 0.237 2.50 1 10/11/2023 22:55 WG2149587
1,2,4-Trimethylbenzene 3.76 0.322 1.00 1 10/11/2023 22:55 WG2149587
1,3,5-Trimethylbenzene 0.320 J 0.104 1.00 1 10/11/2023 22:55 WG2149587
Vinyl chloride U 0.234 1.00 1 10/11/2023 22:55 WG2149587
o-Xylene 1.72 0.174 1.00 1 10/11/2023 22:55 WG2149587
m&p-Xylenes U 0.430 2.00 1 10/11/2023 22:55 WG2149587
(S) Toluene-d8 103 80.0-120 10/11/2023 22:55 WG2149587
(S) Toluene-d8 110 80.0-120 10/12/2023 17:27 WG2150096
(S) 4-Bromofluorobenzene 102 77.0-126 10/11/2023 22:55 WG2149587
(S) 4-Bromofluorobenzene 103 77.0-126 10/12/2023 17:27 WG2150096
(S) 1,2-Dichloroethane-d4 121 70.0-130 10/11/2023 22:55 WG2149587
(S) 1,2-Dichloroethane-d4 102 70.0-130 10/12/2023 17:27 WG2150096
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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SAMPLE RESULTS - 03
L1662774
MW-6R
Collected date/time: 09/29/23 12:45
Volatile Organic Compounds (GC/MS) by Method 6200B-2011
Result Qualifier MDL RDL Dilution Analysis Batch
Analyte ug/l ug/l ug/l date / time
Acetone U 11.3 50.0 1 10/08/2023 21:56 WG2147488
Acrolein U 2.54 50.0 1 10/08/2023 21:56 WG2147488
Acrylonitrile U 0.671 10.0 1 10/08/2023 21:56 WG2147488
Benzene 901 1.88 20.0 20 10/10/2023 07:39 WG2148104
Bromobenzene U 0.118 1.00 1 10/08/2023 21:56 WG2147488
Bromodichloromethane U 0.136 1.00 1 10/08/2023 21:56 WG2147488
Bromoform U 0.129 1.00 1 10/08/2023 21:56 WG2147488
Bromomethane U 0.605 5.00 1 10/08/2023 21:56 WG2147488
n-Butylbenzene U 0.157 1.00 1 10/08/2023 21:56 WG2147488
sec-Butylbenzene 3.05 0.125 1.00 1 10/08/2023 21:56 WG2147488
tert-Butylbenzene U 0.127 1.00 1 10/08/2023 21:56 WG2147488
Carbon tetrachloride U 0.128 1.00 1 10/08/2023 21:56 WG2147488
Chlorobenzene U 0.116 1.00 1 10/08/2023 21:56 WG2147488
Chlorodibromomethane U 0.140 1.00 1 10/08/2023 21:56 WG2147488
Chloroethane U 0.192 5.00 1 10/08/2023 21:56 WG2147488
Chloroform U 0.111 5.00 1 10/08/2023 21:56 WG2147488
Chloromethane U 0.960 2.50 1 10/08/2023 21:56 WG2147488
2-Chlorotoluene U 0.106 1.00 1 10/08/2023 21:56 WG2147488
4-Chlorotoluene U 0.114 1.00 1 10/08/2023 21:56 WG2147488
1,2-Dibromo-3-Chloropropane U 0.276 5.00 1 10/08/2023 21:56 WG2147488
1,2-Dibromoethane U 0.126 1.00 1 10/08/2023 21:56 WG2147488
Dibromomethane U 0.122 1.00 1 10/08/2023 21:56 WG2147488
1,2-Dichlorobenzene U 0.107 1.00 1 10/08/2023 21:56 WG2147488
1,3-Dichlorobenzene U 0.110 1.00 1 10/08/2023 21:56 WG2147488
1,4-Dichlorobenzene U 0.120 1.00 1 10/08/2023 21:56 WG2147488
Dichlorodifluoromethane U 0.374 5.00 1 10/08/2023 21:56 WG2147488
1,1-Dichloroethane U 0.100 1.00 1 10/08/2023 21:56 WG2147488
1,2-Dichloroethane 14.5 0.0819 1.00 1 10/08/2023 21:56 WG2147488
1,1-Dichloroethene U 0.188 1.00 1 10/08/2023 21:56 WG2147488
cis-1,2-Dichloroethene U 0.126 1.00 1 10/08/2023 21:56 WG2147488
trans-1,2-Dichloroethene U 0.149 1.00 1 10/08/2023 21:56 WG2147488
1,2-Dichloropropane U 0.149 1.00 1 10/08/2023 21:56 WG2147488
1,1-Dichloropropene U 0.142 1.00 1 10/08/2023 21:56 WG2147488
1,3-Dichloropropane U 0.110 1.00 1 10/08/2023 21:56 WG2147488
2,2-Dichloropropane U 0.161 1.00 1 10/08/2023 21:56 WG2147488
Di-isopropyl ether U 0.105 1.00 1 10/08/2023 21:56 WG2147488
Ethylbenzene 770 2.74 20.0 20 10/10/2023 07:39 WG2148104
Hexachloro-1,3-butadiene U 0.337 1.00 1 10/08/2023 21:56 WG2147488
Isopropylbenzene 33.7 0.105 1.00 1 10/08/2023 21:56 WG2147488
p-Isopropyltoluene U 0.120 1.00 1 10/08/2023 21:56 WG2147488
2-Butanone (MEK)U 1.19 10.0 1 10/08/2023 21:56 WG2147488
Methylene Chloride U 0.430 5.00 1 10/08/2023 21:56 WG2147488
4-Methyl-2-pentanone (MIBK)7.94 J 0.478 10.0 1 10/08/2023 21:56 WG2147488
Methyl tert-butyl ether U 0.101 1.00 1 10/08/2023 21:56 WG2147488
Naphthalene 108 1.00 5.00 1 10/08/2023 21:56 WG2147488
n-Propylbenzene 105 0.0993 1.00 1 10/08/2023 21:56 WG2147488
Styrene U 0.118 1.00 1 10/08/2023 21:56 WG2147488
1,1,1,2-Tetrachloroethane U 0.147 1.00 1 10/08/2023 21:56 WG2147488
1,1,2,2-Tetrachloroethane U 0.133 1.00 1 10/08/2023 21:56 WG2147488
Tetrachloroethene U 0.300 1.00 1 10/08/2023 21:56 WG2147488
Toluene 920 5.56 20.0 20 10/10/2023 07:39 WG2148104
1,2,3-Trichlorobenzene U 0.230 1.00 1 10/08/2023 21:56 WG2147488
1,2,4-Trichlorobenzene U 0.481 1.00 1 10/08/2023 21:56 WG2147488
1,1,1-Trichloroethane U 0.149 1.00 1 10/08/2023 21:56 WG2147488
1,1,2-Trichloroethane U 0.158 1.00 1 10/08/2023 21:56 WG2147488
Trichloroethene U 0.190 1.00 1 10/08/2023 21:56 WG2147488
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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ATC Group Services LLC L1662774 10/19/23 15:38 9 of 36
SAMPLE RESULTS - 03
L1662774
MW-6R
Collected date/time: 09/29/23 12:45
Volatile Organic Compounds (GC/MS) by Method 6200B-2011
Result Qualifier MDL RDL Dilution Analysis Batch
Analyte ug/l ug/l ug/l date / time
Trichlorofluoromethane U 0.160 5.00 1 10/08/2023 21:56 WG2147488
1,2,3-Trichloropropane U 0.237 2.50 1 10/08/2023 21:56 WG2147488
1,2,4-Trimethylbenzene 745 6.44 20.0 20 10/10/2023 07:39 WG2148104
1,3,5-Trimethylbenzene 157 0.104 1.00 1 10/08/2023 21:56 WG2147488
Vinyl chloride U 0.234 1.00 1 10/08/2023 21:56 WG2147488
o-Xylene 308 3.48 20.0 20 10/10/2023 07:39 WG2148104
m&p-Xylenes 2510 8.60 40.0 20 10/10/2023 07:39 WG2148104
(S) Toluene-d8 98.8 80.0-120 10/08/2023 21:56 WG2147488
(S) Toluene-d8 117 80.0-120 10/10/2023 07:39 WG2148104
(S) 4-Bromofluorobenzene 92.3 77.0-126 10/08/2023 21:56 WG2147488
(S) 4-Bromofluorobenzene 104 77.0-126 10/10/2023 07:39 WG2148104
(S) 1,2-Dichloroethane-d4 114 70.0-130 10/08/2023 21:56 WG2147488
(S) 1,2-Dichloroethane-d4 111 70.0-130 10/10/2023 07:39 WG2148104
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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SAMPLE RESULTS - 04
L1662774
MW-8
Collected date/time: 09/29/23 13:15
Volatile Organic Compounds (GC/MS) by Method 6200B-2011
Result Qualifier MDL RDL Dilution Analysis Batch
Analyte ug/l ug/l ug/l date / time
Acetone U 11.3 50.0 1 10/08/2023 22:18 WG2147488
Acrolein U 2.54 50.0 1 10/08/2023 22:18 WG2147488
Acrylonitrile U 0.671 10.0 1 10/08/2023 22:18 WG2147488
Benzene 1090 2.35 25.0 25 10/10/2023 08:01 WG2148104
Bromobenzene U 0.118 1.00 1 10/08/2023 22:18 WG2147488
Bromodichloromethane U 0.136 1.00 1 10/08/2023 22:18 WG2147488
Bromoform U 0.129 1.00 1 10/08/2023 22:18 WG2147488
Bromomethane U 0.605 5.00 1 10/08/2023 22:18 WG2147488
n-Butylbenzene U 0.157 1.00 1 10/08/2023 22:18 WG2147488
sec-Butylbenzene 0.403 J 0.125 1.00 1 10/08/2023 22:18 WG2147488
tert-Butylbenzene U 0.127 1.00 1 10/08/2023 22:18 WG2147488
Carbon tetrachloride U 0.128 1.00 1 10/08/2023 22:18 WG2147488
Chlorobenzene U 0.116 1.00 1 10/08/2023 22:18 WG2147488
Chlorodibromomethane U 0.140 1.00 1 10/08/2023 22:18 WG2147488
Chloroethane U 0.192 5.00 1 10/08/2023 22:18 WG2147488
Chloroform U 0.111 5.00 1 10/08/2023 22:18 WG2147488
Chloromethane U 0.960 2.50 1 10/08/2023 22:18 WG2147488
2-Chlorotoluene U 0.106 1.00 1 10/08/2023 22:18 WG2147488
4-Chlorotoluene U 0.114 1.00 1 10/08/2023 22:18 WG2147488
1,2-Dibromo-3-Chloropropane U 0.276 5.00 1 10/08/2023 22:18 WG2147488
1,2-Dibromoethane U 0.126 1.00 1 10/08/2023 22:18 WG2147488
Dibromomethane U 0.122 1.00 1 10/08/2023 22:18 WG2147488
1,2-Dichlorobenzene U 0.107 1.00 1 10/08/2023 22:18 WG2147488
1,3-Dichlorobenzene U 0.110 1.00 1 10/08/2023 22:18 WG2147488
1,4-Dichlorobenzene U 0.120 1.00 1 10/08/2023 22:18 WG2147488
Dichlorodifluoromethane U 0.374 5.00 1 10/08/2023 22:18 WG2147488
1,1-Dichloroethane U 0.100 1.00 1 10/08/2023 22:18 WG2147488
1,2-Dichloroethane 255 2.05 25.0 25 10/10/2023 08:01 WG2148104
1,1-Dichloroethene U 0.188 1.00 1 10/08/2023 22:18 WG2147488
cis-1,2-Dichloroethene U 0.126 1.00 1 10/08/2023 22:18 WG2147488
trans-1,2-Dichloroethene U 0.149 1.00 1 10/08/2023 22:18 WG2147488
1,2-Dichloropropane U 0.149 1.00 1 10/08/2023 22:18 WG2147488
1,1-Dichloropropene U 0.142 1.00 1 10/08/2023 22:18 WG2147488
1,3-Dichloropropane U 0.110 1.00 1 10/08/2023 22:18 WG2147488
2,2-Dichloropropane U 0.161 1.00 1 10/08/2023 22:18 WG2147488
Di-isopropyl ether 4.41 0.105 1.00 1 10/08/2023 22:18 WG2147488
Ethylbenzene 100 0.137 1.00 1 10/08/2023 22:18 WG2147488
Hexachloro-1,3-butadiene U 0.337 1.00 1 10/08/2023 22:18 WG2147488
Isopropylbenzene 6.62 0.105 1.00 1 10/08/2023 22:18 WG2147488
p-Isopropyltoluene 0.654 J 0.120 1.00 1 10/08/2023 22:18 WG2147488
2-Butanone (MEK)5.85 J 1.19 10.0 1 10/08/2023 22:18 WG2147488
Methylene Chloride U 0.430 5.00 1 10/08/2023 22:18 WG2147488
4-Methyl-2-pentanone (MIBK)8.72 J 0.478 10.0 1 10/08/2023 22:18 WG2147488
Methyl tert-butyl ether U 0.101 1.00 1 10/08/2023 22:18 WG2147488
Naphthalene 23.0 1.00 5.00 1 10/08/2023 22:18 WG2147488
n-Propylbenzene 12.8 0.0993 1.00 1 10/08/2023 22:18 WG2147488
Styrene U 0.118 1.00 1 10/08/2023 22:18 WG2147488
1,1,1,2-Tetrachloroethane U 0.147 1.00 1 10/08/2023 22:18 WG2147488
1,1,2,2-Tetrachloroethane U 0.133 1.00 1 10/08/2023 22:18 WG2147488
Tetrachloroethene U 0.300 1.00 1 10/08/2023 22:18 WG2147488
Toluene 40.2 0.278 1.00 1 10/08/2023 22:18 WG2147488
1,2,3-Trichlorobenzene U 0.230 1.00 1 10/08/2023 22:18 WG2147488
1,2,4-Trichlorobenzene U 0.481 1.00 1 10/08/2023 22:18 WG2147488
1,1,1-Trichloroethane U 0.149 1.00 1 10/08/2023 22:18 WG2147488
1,1,2-Trichloroethane U 0.158 1.00 1 10/08/2023 22:18 WG2147488
Trichloroethene U 0.190 1.00 1 10/08/2023 22:18 WG2147488
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
ATC Group Services LLC L1662774 10/19/23 15:38 11 of 36
SAMPLE RESULTS - 04
L1662774
MW-8
Collected date/time: 09/29/23 13:15
Volatile Organic Compounds (GC/MS) by Method 6200B-2011
Result Qualifier MDL RDL Dilution Analysis Batch
Analyte ug/l ug/l ug/l date / time
Trichlorofluoromethane U 0.160 5.00 1 10/08/2023 22:18 WG2147488
1,2,3-Trichloropropane U 0.237 2.50 1 10/08/2023 22:18 WG2147488
1,2,4-Trimethylbenzene 85.0 0.322 1.00 1 10/08/2023 22:18 WG2147488
1,3,5-Trimethylbenzene 57.6 0.104 1.00 1 10/08/2023 22:18 WG2147488
Vinyl chloride U 0.234 1.00 1 10/08/2023 22:18 WG2147488
o-Xylene 150 0.174 1.00 1 10/08/2023 22:18 WG2147488
m&p-Xylenes 117 0.430 2.00 1 10/08/2023 22:18 WG2147488
(S) Toluene-d8 97.3 80.0-120 10/08/2023 22:18 WG2147488
(S) Toluene-d8 114 80.0-120 10/10/2023 08:01 WG2148104
(S) 4-Bromofluorobenzene 107 77.0-126 10/08/2023 22:18 WG2147488
(S) 4-Bromofluorobenzene 99.3 77.0-126 10/10/2023 08:01 WG2148104
(S) 1,2-Dichloroethane-d4 114 70.0-130 10/08/2023 22:18 WG2147488
(S) 1,2-Dichloroethane-d4 117 70.0-130 10/10/2023 08:01 WG2148104
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
ATC Group Services LLC L1662774 10/19/23 15:38 12 of 36
SAMPLE RESULTS - 05
L1662774
MW-9
Collected date/time: 09/29/23 13:00
Volatile Organic Compounds (GC/MS) by Method 6200B-2011
Result Qualifier MDL RDL Dilution Analysis Batch
Analyte ug/l ug/l ug/l date / time
Acetone U 11.3 50.0 1 10/08/2023 22:39 WG2147488
Acrolein U 2.54 50.0 1 10/08/2023 22:39 WG2147488
Acrylonitrile U 0.671 10.0 1 10/08/2023 22:39 WG2147488
Benzene 181 0.0941 1.00 1 10/08/2023 22:39 WG2147488
Bromobenzene U 0.118 1.00 1 10/08/2023 22:39 WG2147488
Bromodichloromethane U 0.136 1.00 1 10/08/2023 22:39 WG2147488
Bromoform U 0.129 1.00 1 10/08/2023 22:39 WG2147488
Bromomethane U 0.605 5.00 1 10/08/2023 22:39 WG2147488
n-Butylbenzene 0.743 J 0.157 1.00 1 10/08/2023 22:39 WG2147488
sec-Butylbenzene 0.510 J 0.125 1.00 1 10/08/2023 22:39 WG2147488
tert-Butylbenzene U 0.127 1.00 1 10/08/2023 22:39 WG2147488
Carbon tetrachloride U 0.128 1.00 1 10/08/2023 22:39 WG2147488
Chlorobenzene U 0.116 1.00 1 10/08/2023 22:39 WG2147488
Chlorodibromomethane U 0.140 1.00 1 10/08/2023 22:39 WG2147488
Chloroethane U 0.192 5.00 1 10/08/2023 22:39 WG2147488
Chloroform U 0.111 5.00 1 10/08/2023 22:39 WG2147488
Chloromethane U 0.960 2.50 1 10/08/2023 22:39 WG2147488
2-Chlorotoluene U 0.106 1.00 1 10/08/2023 22:39 WG2147488
4-Chlorotoluene U 0.114 1.00 1 10/08/2023 22:39 WG2147488
1,2-Dibromo-3-Chloropropane U 0.276 5.00 1 10/08/2023 22:39 WG2147488
1,2-Dibromoethane 0.641 J 0.126 1.00 1 10/08/2023 22:39 WG2147488
Dibromomethane U 0.122 1.00 1 10/08/2023 22:39 WG2147488
1,2-Dichlorobenzene U 0.107 1.00 1 10/08/2023 22:39 WG2147488
1,3-Dichlorobenzene U 0.110 1.00 1 10/08/2023 22:39 WG2147488
1,4-Dichlorobenzene U 0.120 1.00 1 10/08/2023 22:39 WG2147488
Dichlorodifluoromethane U 0.374 5.00 1 10/08/2023 22:39 WG2147488
1,1-Dichloroethane U 0.100 1.00 1 10/08/2023 22:39 WG2147488
1,2-Dichloroethane 18.0 0.0819 1.00 1 10/08/2023 22:39 WG2147488
1,1-Dichloroethene U 0.188 1.00 1 10/08/2023 22:39 WG2147488
cis-1,2-Dichloroethene U 0.126 1.00 1 10/08/2023 22:39 WG2147488
trans-1,2-Dichloroethene U 0.149 1.00 1 10/08/2023 22:39 WG2147488
1,2-Dichloropropane U 0.149 1.00 1 10/08/2023 22:39 WG2147488
1,1-Dichloropropene U 0.142 1.00 1 10/08/2023 22:39 WG2147488
1,3-Dichloropropane U 0.110 1.00 1 10/08/2023 22:39 WG2147488
2,2-Dichloropropane U 0.161 1.00 1 10/08/2023 22:39 WG2147488
Di-isopropyl ether U 0.105 1.00 1 10/08/2023 22:39 WG2147488
Ethylbenzene 35.8 0.137 1.00 1 10/08/2023 22:39 WG2147488
Hexachloro-1,3-butadiene U 0.337 1.00 1 10/08/2023 22:39 WG2147488
Isopropylbenzene 4.01 0.105 1.00 1 10/08/2023 22:39 WG2147488
p-Isopropyltoluene U 0.120 1.00 1 10/08/2023 22:39 WG2147488
2-Butanone (MEK)U 1.19 10.0 1 10/08/2023 22:39 WG2147488
Methylene Chloride U 0.430 5.00 1 10/08/2023 22:39 WG2147488
4-Methyl-2-pentanone (MIBK)U 0.478 10.0 1 10/08/2023 22:39 WG2147488
Methyl tert-butyl ether U 0.101 1.00 1 10/08/2023 22:39 WG2147488
Naphthalene 13.4 1.00 5.00 1 10/08/2023 22:39 WG2147488
n-Propylbenzene 8.81 0.0993 1.00 1 10/08/2023 22:39 WG2147488
Styrene U 0.118 1.00 1 10/08/2023 22:39 WG2147488
1,1,1,2-Tetrachloroethane U 0.147 1.00 1 10/08/2023 22:39 WG2147488
1,1,2,2-Tetrachloroethane U 0.133 1.00 1 10/08/2023 22:39 WG2147488
Tetrachloroethene U 0.300 1.00 1 10/08/2023 22:39 WG2147488
Toluene 17.6 0.278 1.00 1 10/08/2023 22:39 WG2147488
1,2,3-Trichlorobenzene U 0.230 1.00 1 10/08/2023 22:39 WG2147488
1,2,4-Trichlorobenzene U 0.481 1.00 1 10/08/2023 22:39 WG2147488
1,1,1-Trichloroethane U 0.149 1.00 1 10/08/2023 22:39 WG2147488
1,1,2-Trichloroethane U 0.158 1.00 1 10/08/2023 22:39 WG2147488
Trichloroethene U 0.190 1.00 1 10/08/2023 22:39 WG2147488
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
ATC Group Services LLC L1662774 10/19/23 15:38 13 of 36
SAMPLE RESULTS - 05
L1662774
MW-9
Collected date/time: 09/29/23 13:00
Volatile Organic Compounds (GC/MS) by Method 6200B-2011
Result Qualifier MDL RDL Dilution Analysis Batch
Analyte ug/l ug/l ug/l date / time
Trichlorofluoromethane U 0.160 5.00 1 10/08/2023 22:39 WG2147488
1,2,3-Trichloropropane U 0.237 2.50 1 10/08/2023 22:39 WG2147488
1,2,4-Trimethylbenzene 36.0 0.322 1.00 1 10/08/2023 22:39 WG2147488
1,3,5-Trimethylbenzene 4.54 0.104 1.00 1 10/08/2023 22:39 WG2147488
Vinyl chloride U 0.234 1.00 1 10/08/2023 22:39 WG2147488
o-Xylene 23.2 0.174 1.00 1 10/08/2023 22:39 WG2147488
m&p-Xylenes 39.4 0.430 2.00 1 10/08/2023 22:39 WG2147488
(S) Toluene-d8 127 J1 80.0-120 10/08/2023 22:39 WG2147488
(S) 4-Bromofluorobenzene 96.4 77.0-126 10/08/2023 22:39 WG2147488
(S) 1,2-Dichloroethane-d4 105 70.0-130 10/08/2023 22:39 WG2147488
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
ATC Group Services LLC L1662774 10/19/23 15:38 14 of 36
SAMPLE RESULTS - 06
L1662774
FB-1
Collected date/time: 09/29/23 13:35
Volatile Organic Compounds (GC/MS) by Method 6200B-2011
Result Qualifier MDL RDL Dilution Analysis Batch
Analyte ug/l ug/l ug/l date / time
Acetone 12.4 J 11.3 50.0 1 10/07/2023 05:59 WG2146827
Acrolein U 2.54 50.0 1 10/07/2023 05:59 WG2146827
Acrylonitrile U 0.671 10.0 1 10/07/2023 05:59 WG2146827
Benzene U 0.0941 1.00 1 10/07/2023 05:59 WG2146827
Bromobenzene U 0.118 1.00 1 10/07/2023 05:59 WG2146827
Bromodichloromethane U 0.136 1.00 1 10/07/2023 05:59 WG2146827
Bromoform U 0.129 1.00 1 10/07/2023 05:59 WG2146827
Bromomethane U 0.605 5.00 1 10/13/2023 20:58 WG2150753
n-Butylbenzene U 0.157 1.00 1 10/07/2023 05:59 WG2146827
sec-Butylbenzene U 0.125 1.00 1 10/07/2023 05:59 WG2146827
tert-Butylbenzene U 0.127 1.00 1 10/07/2023 05:59 WG2146827
Carbon tetrachloride U 0.128 1.00 1 10/07/2023 05:59 WG2146827
Chlorobenzene U 0.116 1.00 1 10/07/2023 05:59 WG2146827
Chlorodibromomethane U 0.140 1.00 1 10/07/2023 05:59 WG2146827
Chloroethane U 0.192 5.00 1 10/07/2023 05:59 WG2146827
Chloroform U 0.111 5.00 1 10/07/2023 05:59 WG2146827
Chloromethane U 0.960 2.50 1 10/07/2023 05:59 WG2146827
2-Chlorotoluene U 0.106 1.00 1 10/07/2023 05:59 WG2146827
4-Chlorotoluene U 0.114 1.00 1 10/07/2023 05:59 WG2146827
1,2-Dibromo-3-Chloropropane U 0.276 5.00 1 10/07/2023 05:59 WG2146827
1,2-Dibromoethane U 0.126 1.00 1 10/07/2023 05:59 WG2146827
Dibromomethane U 0.122 1.00 1 10/07/2023 05:59 WG2146827
1,2-Dichlorobenzene U 0.107 1.00 1 10/07/2023 05:59 WG2146827
1,3-Dichlorobenzene U 0.110 1.00 1 10/07/2023 05:59 WG2146827
1,4-Dichlorobenzene U 0.120 1.00 1 10/07/2023 05:59 WG2146827
Dichlorodifluoromethane U 0.374 5.00 1 10/07/2023 05:59 WG2146827
1,1-Dichloroethane U 0.100 1.00 1 10/07/2023 05:59 WG2146827
1,2-Dichloroethane U 0.0819 1.00 1 10/07/2023 05:59 WG2146827
1,1-Dichloroethene U 0.188 1.00 1 10/07/2023 05:59 WG2146827
cis-1,2-Dichloroethene U 0.126 1.00 1 10/07/2023 05:59 WG2146827
trans-1,2-Dichloroethene U 0.149 1.00 1 10/07/2023 05:59 WG2146827
1,2-Dichloropropane U 0.149 1.00 1 10/07/2023 05:59 WG2146827
1,1-Dichloropropene U 0.142 1.00 1 10/07/2023 05:59 WG2146827
1,3-Dichloropropane U 0.110 1.00 1 10/07/2023 05:59 WG2146827
2,2-Dichloropropane U 0.161 1.00 1 10/07/2023 05:59 WG2146827
Di-isopropyl ether U 0.105 1.00 1 10/07/2023 05:59 WG2146827
Ethylbenzene U 0.137 1.00 1 10/07/2023 05:59 WG2146827
Hexachloro-1,3-butadiene U 0.337 1.00 1 10/07/2023 05:59 WG2146827
Isopropylbenzene U 0.105 1.00 1 10/07/2023 05:59 WG2146827
p-Isopropyltoluene U 0.120 1.00 1 10/07/2023 05:59 WG2146827
2-Butanone (MEK)5.95 J 1.19 10.0 1 10/07/2023 05:59 WG2146827
Methylene Chloride 0.467 J 0.430 5.00 1 10/07/2023 05:59 WG2146827
4-Methyl-2-pentanone (MIBK)U 0.478 10.0 1 10/07/2023 05:59 WG2146827
Methyl tert-butyl ether U 0.101 1.00 1 10/07/2023 05:59 WG2146827
Naphthalene U 1.00 5.00 1 10/13/2023 20:58 WG2150753
n-Propylbenzene U 0.0993 1.00 1 10/07/2023 05:59 WG2146827
Styrene U 0.118 1.00 1 10/07/2023 05:59 WG2146827
1,1,1,2-Tetrachloroethane U 0.147 1.00 1 10/07/2023 05:59 WG2146827
1,1,2,2-Tetrachloroethane U 0.133 1.00 1 10/07/2023 05:59 WG2146827
Tetrachloroethene U 0.300 1.00 1 10/07/2023 05:59 WG2146827
Toluene U 0.278 1.00 1 10/07/2023 05:59 WG2146827
1,2,3-Trichlorobenzene U 0.230 1.00 1 10/07/2023 05:59 WG2146827
1,2,4-Trichlorobenzene U 0.481 1.00 1 10/13/2023 20:58 WG2150753
1,1,1-Trichloroethane U 0.149 1.00 1 10/07/2023 05:59 WG2146827
1,1,2-Trichloroethane U 0.158 1.00 1 10/07/2023 05:59 WG2146827
Trichloroethene U 0.190 1.00 1 10/07/2023 05:59 WG2146827
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
ATC Group Services LLC L1662774 10/19/23 15:20 15 of 36
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
ATC Group Services LLC L1662774 10/19/23 15:38 15 of 36
SAMPLE RESULTS - 06
L1662774
FB-1
Collected date/time: 09/29/23 13:35
Volatile Organic Compounds (GC/MS) by Method 6200B-2011
Result Qualifier MDL RDL Dilution Analysis Batch
Analyte ug/l ug/l ug/l date / time
Trichlorofluoromethane U 0.160 5.00 1 10/07/2023 05:59 WG2146827
1,2,3-Trichloropropane U 0.237 2.50 1 10/07/2023 05:59 WG2146827
1,2,4-Trimethylbenzene U 0.322 1.00 1 10/07/2023 05:59 WG2146827
1,3,5-Trimethylbenzene U 0.104 1.00 1 10/07/2023 05:59 WG2146827
Vinyl chloride U 0.234 1.00 1 10/07/2023 05:59 WG2146827
o-Xylene U 0.174 1.00 1 10/07/2023 05:59 WG2146827
m&p-Xylenes U 0.430 2.00 1 10/07/2023 05:59 WG2146827
(S) Toluene-d8 109 80.0-120 10/07/2023 05:59 WG2146827
(S) Toluene-d8 102 80.0-120 10/13/2023 20:58 WG2150753
(S) 4-Bromofluorobenzene 105 77.0-126 10/07/2023 05:59 WG2146827
(S) 4-Bromofluorobenzene 91.4 77.0-126 10/13/2023 20:58 WG2150753
(S) 1,2-Dichloroethane-d4 96.6 70.0-130 10/07/2023 05:59 WG2146827
(S) 1,2-Dichloroethane-d4 96.4 70.0-130 10/13/2023 20:58 WG2150753
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG2146827
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 L1662774-06
Method Blank (MB)
(MB) R3984346-2 10/07/23 05:13
MB Result MB Qualifier MB MDL MB RDL
Analyte ug/l ug/l ug/l
Acetone U 11.3 50.0
Acrolein U 2.54 50.0
Acrylonitrile U 0.671 10.0
Benzene U 0.0941 1.00
Bromobenzene U 0.118 1.00
Bromodichloromethane U 0.136 1.00
Bromoform U 0.129 1.00
n-Butylbenzene U 0.157 1.00
sec-Butylbenzene U 0.125 1.00
tert-Butylbenzene U 0.127 1.00
Carbon tetrachloride U 0.128 1.00
Chlorobenzene U 0.116 1.00
Chlorodibromomethane U 0.140 1.00
Chloroethane U 0.192 5.00
Chloroform U 0.111 5.00
Chloromethane U 0.960 2.50
2-Chlorotoluene U 0.106 1.00
4-Chlorotoluene U 0.114 1.00
1,2-Dibromo-3-Chloropropane U 0.276 5.00
1,2-Dibromoethane U 0.126 1.00
Dibromomethane U 0.122 1.00
1,2-Dichlorobenzene U 0.107 1.00
1,3-Dichlorobenzene U 0.110 1.00
1,4-Dichlorobenzene U 0.120 1.00
Dichlorodifluoromethane U 0.374 5.00
1,1-Dichloroethane U 0.100 1.00
1,2-Dichloroethane U 0.0819 1.00
1,1-Dichloroethene U 0.188 1.00
cis-1,2-Dichloroethene U 0.126 1.00
trans-1,2-Dichloroethene U 0.149 1.00
1,2-Dichloropropane U 0.149 1.00
1,1-Dichloropropene U 0.142 1.00
1,3-Dichloropropane U 0.110 1.00
2,2-Dichloropropane U 0.161 1.00
Di-isopropyl ether U 0.105 1.00
Ethylbenzene U 0.137 1.00
Hexachloro-1,3-butadiene U 0.337 1.00
Isopropylbenzene U 0.105 1.00
p-Isopropyltoluene U 0.120 1.00
2-Butanone (MEK)U 1.19 10.0
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG2146827
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 L1662774-06
Method Blank (MB)
(MB) R3984346-2 10/07/23 05:13
MB Result MB Qualifier MB MDL MB RDL
Analyte ug/l ug/l ug/l
Methylene Chloride U 0.430 5.00
4-Methyl-2-pentanone (MIBK)U 0.478 10.0
Methyl tert-butyl ether U 0.101 1.00
n-Propylbenzene U 0.0993 1.00
Styrene U 0.118 1.00
1,1,1,2-Tetrachloroethane U 0.147 1.00
1,1,2,2-Tetrachloroethane U 0.133 1.00
Tetrachloroethene U 0.300 1.00
Toluene U 0.278 1.00
1,2,3-Trichlorobenzene U 0.230 1.00
1,1,1-Trichloroethane U 0.149 1.00
1,1,2-Trichloroethane U 0.158 1.00
Trichloroethene U 0.190 1.00
Trichlorofluoromethane U 0.160 5.00
1,2,3-Trichloropropane U 0.237 2.50
1,2,4-Trimethylbenzene U 0.322 1.00
1,3,5-Trimethylbenzene U 0.104 1.00
Vinyl chloride U 0.234 1.00
o-Xylene U 0.174 1.00
m&p-Xylenes U 0.430 2.00
(S) Toluene-d8 106 80.0-120
(S) 4-Bromofluorobenzene 105 77.0-126
(S) 1,2-Dichloroethane-d4 98.3 70.0-130
Laboratory Control Sample (LCS)
(LCS) R3984346-1 10/07/23 04:26
Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier
Analyte ug/l ug/l %%
Acetone 25.0 28.2 113 19.0-160
Acrolein 25.0 25.7 103 10.0-160
Acrylonitrile 25.0 26.0 104 55.0-149
Benzene 5.00 5.20 104 70.0-123
Bromobenzene 5.00 4.69 93.8 73.0-121
Bromodichloromethane 5.00 4.97 99.4 75.0-120
Bromoform 5.00 5.26 105 68.0-132
n-Butylbenzene 5.00 4.10 82.0 73.0-125
sec-Butylbenzene 5.00 4.59 91.8 75.0-125
tert-Butylbenzene 5.00 4.45 89.0 76.0-124
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG2146827
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 L1662774-06
Laboratory Control Sample (LCS)
(LCS) R3984346-1 10/07/23 04:26
Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier
Analyte ug/l ug/l %%
Carbon tetrachloride 5.00 5.55 111 68.0-126
Chlorobenzene 5.00 5.02 100 80.0-121
Chlorodibromomethane 5.00 4.96 99.2 77.0-125
Chloroethane 5.00 3.49 69.8 47.0-150
Chloroform 5.00 5.42 108 73.0-120
Chloromethane 5.00 4.25 85.0 41.0-142
2-Chlorotoluene 5.00 4.70 94.0 76.0-123
4-Chlorotoluene 5.00 4.44 88.8 75.0-122
1,2-Dibromo-3-Chloropropane 5.00 4.40 88.0 58.0-134
1,2-Dibromoethane 5.00 4.97 99.4 80.0-122
Dibromomethane 5.00 4.91 98.2 80.0-120
1,2-Dichlorobenzene 5.00 4.74 94.8 79.0-121
1,3-Dichlorobenzene 5.00 4.83 96.6 79.0-120
1,4-Dichlorobenzene 5.00 4.57 91.4 79.0-120
Dichlorodifluoromethane 5.00 4.61 92.2 51.0-149
1,1-Dichloroethane 5.00 5.26 105 70.0-126
1,2-Dichloroethane 5.00 5.04 101 70.0-128
1,1-Dichloroethene 5.00 5.34 107 71.0-124
cis-1,2-Dichloroethene 5.00 5.38 108 73.0-120
trans-1,2-Dichloroethene 5.00 5.07 101 73.0-120
1,2-Dichloropropane 5.00 5.03 101 77.0-125
1,1-Dichloropropene 5.00 5.25 105 74.0-126
1,3-Dichloropropane 5.00 4.84 96.8 80.0-120
2,2-Dichloropropane 5.00 5.59 112 58.0-130
Di-isopropyl ether 5.00 4.79 95.8 58.0-138
Ethylbenzene 5.00 4.71 94.2 79.0-123
Hexachloro-1,3-butadiene 5.00 5.31 106 54.0-138
Isopropylbenzene 5.00 4.78 95.6 76.0-127
p-Isopropyltoluene 5.00 4.39 87.8 76.0-125
2-Butanone (MEK)25.0 26.6 106 44.0-160
Methylene Chloride 5.00 4.81 96.2 67.0-120
4-Methyl-2-pentanone (MIBK)25.0 23.9 95.6 68.0-142
Methyl tert-butyl ether 5.00 4.65 93.0 68.0-125
n-Propylbenzene 5.00 4.50 90.0 77.0-124
Styrene 5.00 4.22 84.4 73.0-130
1,1,1,2-Tetrachloroethane 5.00 5.28 106 75.0-125
1,1,2,2-Tetrachloroethane 5.00 4.78 95.6 65.0-130
Tetrachloroethene 5.00 5.43 109 72.0-132
Toluene 5.00 5.04 101 79.0-120
1,2,3-Trichlorobenzene 5.00 3.59 71.8 50.0-138
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG2146827
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 L1662774-06
Laboratory Control Sample (LCS)
(LCS) R3984346-1 10/07/23 04:26
Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier
Analyte ug/l ug/l %%
1,1,1-Trichloroethane 5.00 5.61 112 73.0-124
1,1,2-Trichloroethane 5.00 5.16 103 80.0-120
Trichloroethene 5.00 5.33 107 78.0-124
Trichlorofluoromethane 5.00 4.50 90.0 59.0-147
1,2,3-Trichloropropane 5.00 5.12 102 73.0-130
1,2,4-Trimethylbenzene 5.00 4.47 89.4 76.0-121
1,3,5-Trimethylbenzene 5.00 4.54 90.8 76.0-122
Vinyl chloride 5.00 4.11 82.2 67.0-131
o-Xylene 5.00 4.58 91.6 80.0-122
m&p-Xylenes 10.0 9.80 98.0 80.0-122
(S) Toluene-d8 106 80.0-120
(S) 4-Bromofluorobenzene 111 77.0-126
(S) 1,2-Dichloroethane-d4 92.9 70.0-130
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG2147488
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 L1662774-03,04,05
Method Blank (MB)
(MB) R3983940-3 10/08/23 18:49
MB Result MB Qualifier MB MDL MB RDL
Analyte ug/l ug/l ug/l
Acetone U 11.3 50.0
Acrolein U 2.54 50.0
Acrylonitrile U 0.671 10.0
Benzene U 0.0941 1.00
Bromobenzene U 0.118 1.00
Bromodichloromethane U 0.136 1.00
Bromoform U 0.129 1.00
Bromomethane U 0.605 5.00
n-Butylbenzene U 0.157 1.00
sec-Butylbenzene U 0.125 1.00
tert-Butylbenzene U 0.127 1.00
Carbon tetrachloride U 0.128 1.00
Chlorobenzene U 0.116 1.00
Chlorodibromomethane U 0.140 1.00
Chloroethane U 0.192 5.00
Chloroform U 0.111 5.00
Chloromethane U 0.960 2.50
2-Chlorotoluene U 0.106 1.00
4-Chlorotoluene U 0.114 1.00
1,2-Dibromo-3-Chloropropane U 0.276 5.00
1,2-Dibromoethane U 0.126 1.00
Dibromomethane U 0.122 1.00
1,2-Dichlorobenzene U 0.107 1.00
1,3-Dichlorobenzene U 0.110 1.00
1,4-Dichlorobenzene U 0.120 1.00
Dichlorodifluoromethane U 0.374 5.00
1,1-Dichloroethane U 0.100 1.00
1,2-Dichloroethane U 0.0819 1.00
1,1-Dichloroethene U 0.188 1.00
cis-1,2-Dichloroethene U 0.126 1.00
trans-1,2-Dichloroethene U 0.149 1.00
1,2-Dichloropropane U 0.149 1.00
1,1-Dichloropropene U 0.142 1.00
1,3-Dichloropropane U 0.110 1.00
2,2-Dichloropropane U 0.161 1.00
Di-isopropyl ether U 0.105 1.00
Ethylbenzene U 0.137 1.00
Hexachloro-1,3-butadiene U 0.337 1.00
Isopropylbenzene U 0.105 1.00
p-Isopropyltoluene U 0.120 1.00
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG2147488
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 L1662774-03,04,05
Method Blank (MB)
(MB) R3983940-3 10/08/23 18:49
MB Result MB Qualifier MB MDL MB RDL
Analyte ug/l ug/l ug/l
2-Butanone (MEK)U 1.19 10.0
Methylene Chloride U 0.430 5.00
4-Methyl-2-pentanone (MIBK)U 0.478 10.0
Methyl tert-butyl ether U 0.101 1.00
Naphthalene U 1.00 5.00
n-Propylbenzene U 0.0993 1.00
Styrene U 0.118 1.00
1,1,1,2-Tetrachloroethane U 0.147 1.00
1,1,2,2-Tetrachloroethane U 0.133 1.00
Tetrachloroethene U 0.300 1.00
Toluene U 0.278 1.00
1,2,3-Trichlorobenzene U 0.230 1.00
1,2,4-Trichlorobenzene U 0.481 1.00
1,1,1-Trichloroethane U 0.149 1.00
1,1,2-Trichloroethane U 0.158 1.00
Trichloroethene U 0.190 1.00
Trichlorofluoromethane U 0.160 5.00
1,2,3-Trichloropropane U 0.237 2.50
1,2,4-Trimethylbenzene U 0.322 1.00
1,3,5-Trimethylbenzene U 0.104 1.00
Vinyl chloride U 0.234 1.00
o-Xylene U 0.174 1.00
m&p-Xylenes U 0.430 2.00
(S) Toluene-d8 103 80.0-120
(S) 4-Bromofluorobenzene 96.8 77.0-126
(S) 1,2-Dichloroethane-d4 99.8 70.0-130
Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD)
(LCS) R3983940-1 10/08/23 17:44 • (LCSD) R3983940-2 10/08/23 18:06
Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits
Analyte ug/l ug/l ug/l %%%%%
Acetone 25.0 24.5 22.7 98.0 90.8 19.0-160 7.63 27
Acrolein 25.0 17.8 15.3 71.2 61.2 10.0-160 15.1 26
Acrylonitrile 25.0 21.6 23.4 86.4 93.6 55.0-149 8.00 20
Benzene 5.00 4.68 4.88 93.6 97.6 70.0-123 4.18 20
Bromobenzene 5.00 5.05 5.11 101 102 73.0-121 1.18 20
Bromodichloromethane 5.00 4.89 5.17 97.8 103 75.0-120 5.57 20
Bromoform 5.00 4.66 4.95 93.2 99.0 68.0-132 6.04 20
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG2147488
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 L1662774-03,04,05
Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD)
(LCS) R3983940-1 10/08/23 17:44 • (LCSD) R3983940-2 10/08/23 18:06
Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits
Analyte ug/l ug/l ug/l %%%%%
Bromomethane 5.00 4.92 5.16 98.4 103 10.0-160 4.76 25
n-Butylbenzene 5.00 4.69 4.56 93.8 91.2 73.0-125 2.81 20
sec-Butylbenzene 5.00 4.98 4.99 99.6 99.8 75.0-125 0.201 20
tert-Butylbenzene 5.00 4.90 5.16 98.0 103 76.0-124 5.17 20
Carbon tetrachloride 5.00 4.71 4.62 94.2 92.4 68.0-126 1.93 20
Chlorobenzene 5.00 4.74 4.93 94.8 98.6 80.0-121 3.93 20
Chlorodibromomethane 5.00 5.32 5.34 106 107 77.0-125 0.375 20
Chloroethane 5.00 4.90 5.11 98.0 102 47.0-150 4.20 20
Chloroform 5.00 4.75 5.04 95.0 101 73.0-120 5.92 20
Chloromethane 5.00 5.37 5.46 107 109 41.0-142 1.66 20
2-Chlorotoluene 5.00 4.90 5.19 98.0 104 76.0-123 5.75 20
4-Chlorotoluene 5.00 5.06 5.21 101 104 75.0-122 2.92 20
1,2-Dibromo-3-Chloropropane 5.00 4.46 4.45 89.2 89.0 58.0-134 0.224 20
1,2-Dibromoethane 5.00 4.81 4.99 96.2 99.8 80.0-122 3.67 20
Dibromomethane 5.00 4.84 5.10 96.8 102 80.0-120 5.23 20
1,2-Dichlorobenzene 5.00 4.59 4.95 91.8 99.0 79.0-121 7.55 20
1,3-Dichlorobenzene 5.00 5.20 5.23 104 105 79.0-120 0.575 20
1,4-Dichlorobenzene 5.00 5.20 5.32 104 106 79.0-120 2.28 20
Dichlorodifluoromethane 5.00 6.47 6.26 129 125 51.0-149 3.30 20
1,1-Dichloroethane 5.00 4.33 4.48 86.6 89.6 70.0-126 3.41 20
1,2-Dichloroethane 5.00 4.59 4.81 91.8 96.2 70.0-128 4.68 20
1,1-Dichloroethene 5.00 5.02 4.32 100 86.4 71.0-124 15.0 20
cis-1,2-Dichloroethene 5.00 4.66 4.95 93.2 99.0 73.0-120 6.04 20
trans-1,2-Dichloroethene 5.00 4.75 4.30 95.0 86.0 73.0-120 9.94 20
1,2-Dichloropropane 5.00 4.53 4.79 90.6 95.8 77.0-125 5.58 20
1,1-Dichloropropene 5.00 4.89 5.03 97.8 101 74.0-126 2.82 20
1,3-Dichloropropane 5.00 4.85 5.10 97.0 102 80.0-120 5.03 20
2,2-Dichloropropane 5.00 4.40 4.51 88.0 90.2 58.0-130 2.47 20
Di-isopropyl ether 5.00 4.12 3.76 82.4 75.2 58.0-138 9.14 20
Ethylbenzene 5.00 4.74 4.82 94.8 96.4 79.0-123 1.67 20
Hexachloro-1,3-butadiene 5.00 5.50 5.00 110 100 54.0-138 9.52 20
Isopropylbenzene 5.00 4.75 4.80 95.0 96.0 76.0-127 1.05 20
p-Isopropyltoluene 5.00 4.92 4.91 98.4 98.2 76.0-125 0.203 20
2-Butanone (MEK)25.0 21.8 23.1 87.2 92.4 44.0-160 5.79 20
Methylene Chloride 5.00 4.41 3.96 88.2 79.2 67.0-120 10.8 20
4-Methyl-2-pentanone (MIBK)25.0 21.9 23.2 87.6 92.8 68.0-142 5.76 20
Methyl tert-butyl ether 5.00 4.10 3.69 82.0 73.8 68.0-125 10.5 20
Naphthalene 5.00 4.84 4.67 96.8 93.4 54.0-135 3.58 20
n-Propylbenzene 5.00 5.24 5.25 105 105 77.0-124 0.191 20
Styrene 5.00 4.34 4.54 86.8 90.8 73.0-130 4.50 20
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG2147488
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 L1662774-03,04,05
Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD)
(LCS) R3983940-1 10/08/23 17:44 • (LCSD) R3983940-2 10/08/23 18:06
Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits
Analyte ug/l ug/l ug/l %%%%%
1,1,1,2-Tetrachloroethane 5.00 4.34 4.71 86.8 94.2 75.0-125 8.18 20
1,1,2,2-Tetrachloroethane 5.00 5.04 5.31 101 106 65.0-130 5.22 20
Tetrachloroethene 5.00 5.38 5.47 108 109 72.0-132 1.66 20
Toluene 5.00 4.95 5.16 99.0 103 79.0-120 4.15 20
1,2,3-Trichlorobenzene 5.00 4.96 4.59 99.2 91.8 50.0-138 7.75 20
1,2,4-Trichlorobenzene 5.00 5.07 4.64 101 92.8 57.0-137 8.86 20
1,1,1-Trichloroethane 5.00 5.10 5.14 102 103 73.0-124 0.781 20
1,1,2-Trichloroethane 5.00 5.11 5.24 102 105 80.0-120 2.51 20
Trichloroethene 5.00 4.60 4.89 92.0 97.8 78.0-124 6.11 20
Trichlorofluoromethane 5.00 6.03 5.75 121 115 59.0-147 4.75 20
1,2,3-Trichloropropane 5.00 5.10 5.14 102 103 73.0-130 0.781 20
1,2,4-Trimethylbenzene 5.00 4.77 4.80 95.4 96.0 76.0-121 0.627 20
1,3,5-Trimethylbenzene 5.00 4.86 4.91 97.2 98.2 76.0-122 1.02 20
Vinyl chloride 5.00 4.98 5.06 99.6 101 67.0-131 1.59 20
o-Xylene 5.00 4.46 4.56 89.2 91.2 80.0-122 2.22 20
m&p-Xylenes 10.0 9.20 9.76 92.0 97.6 80.0-122 5.91 20
(S) Toluene-d8 103 104 80.0-120
(S) 4-Bromofluorobenzene 91.3 98.5 77.0-126
(S) 1,2-Dichloroethane-d4 98.7 101 70.0-130
L1663275-04 Original Sample (OS) • Matrix Spike (MS) • Matrix Spike Duplicate (MSD)
(OS) L1663275-04 10/09/23 00:26 • (MS) R3983940-4 10/09/23 04:02 • (MSD) R3983940-5 10/09/23 04:24
Spike Amount Original Result MS Result MSD Result MS Rec.MSD Rec.Dilution Rec. Limits MS Qualifier MSD Qualifier RPD RPD Limits
Analyte ug/l ug/l ug/l ug/l %%%%%
Acetone 25.0 U 41.4 39.0 166 156 1 10.0-160 J5 5.97 35
Acrolein 25.0 U 41.6 42.8 166 171 1 10.0-160 J5 J5 2.84 39
Acrylonitrile 25.0 U 27.7 26.6 111 106 1 21.0-160 4.05 32
Benzene 5.00 5.35 7.73 7.73 47.6 47.6 1 17.0-158 0.000 27
Bromobenzene 5.00 U 9.03 8.98 181 180 1 30.0-149 J5 J5 0.555 28
Bromodichloromethane 5.00 U 5.52 6.06 110 121 1 31.0-150 9.33 27
Bromoform 5.00 U 5.67 5.84 113 117 1 29.0-150 2.95 29
Bromomethane 5.00 U 4.30 5.73 86.0 115 1 10.0-160 28.5 38
n-Butylbenzene 5.00 7.37 12.6 13.1 105 115 1 31.0-150 3.89 30
sec-Butylbenzene 5.00 4.43 10.4 10.4 119 119 1 33.0-155 0.000 29
tert-Butylbenzene 5.00 0.685 6.56 6.92 118 125 1 34.0-153 5.34 28
Carbon tetrachloride 5.00 U 5.86 6.35 117 127 1 23.0-159 8.03 28
Chlorobenzene 5.00 U 5.16 5.44 103 109 1 33.0-152 5.28 27
Chlorodibromomethane 5.00 U 6.09 6.46 122 129 1 37.0-149 5.90 27
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG2147488
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 L1662774-03,04,05
L1663275-04 Original Sample (OS) • Matrix Spike (MS) • Matrix Spike Duplicate (MSD)
(OS) L1663275-04 10/09/23 00:26 • (MS) R3983940-4 10/09/23 04:02 • (MSD) R3983940-5 10/09/23 04:24
Spike Amount Original Result MS Result MSD Result MS Rec.MSD Rec.Dilution Rec. Limits MS Qualifier MSD Qualifier RPD RPD Limits
Analyte ug/l ug/l ug/l ug/l %%%%%
Chloroethane 5.00 U 3.81 5.29 76.2 106 1 10.0-160 J3 32.5 30
Chloroform 5.00 U 6.01 6.34 120 127 1 29.0-154 5.34 28
Chloromethane 5.00 U 5.15 5.62 103 112 1 10.0-160 8.73 29
2-Chlorotoluene 5.00 U 5.50 5.87 110 117 1 32.0-153 6.51 28
4-Chlorotoluene 5.00 U 5.38 5.84 108 117 1 32.0-150 8.20 28
1,2-Dibromo-3-Chloropropane 5.00 U 5.31 5.30 106 106 1 22.0-151 0.189 34
1,2-Dibromoethane 5.00 U 5.55 5.65 111 113 1 34.0-147 1.79 27
Dibromomethane 5.00 U 5.50 5.93 110 119 1 30.0-151 7.52 27
1,2-Dichlorobenzene 5.00 U 5.44 5.80 109 116 1 34.0-149 6.41 28
1,3-Dichlorobenzene 5.00 U 5.59 6.02 112 120 1 36.0-146 7.41 27
1,4-Dichlorobenzene 5.00 U 5.49 5.95 110 119 1 35.0-142 8.04 27
Dichlorodifluoromethane 5.00 U 7.53 8.33 151 167 1 10.0-160 J5 10.1 29
1,1-Dichloroethane 5.00 U 4.97 5.44 99.4 109 1 25.0-158 9.03 27
1,2-Dichloroethane 5.00 U 5.43 5.61 109 112 1 29.0-151 3.26 27
1,1-Dichloroethene 5.00 U 5.83 6.59 117 132 1 11.0-160 12.2 29
cis-1,2-Dichloroethene 5.00 U 5.24 5.71 105 114 1 10.0-160 8.58 27
trans-1,2-Dichloroethene 5.00 U 5.40 6.09 108 122 1 17.0-153 12.0 27
1,2-Dichloropropane 5.00 U 4.98 5.40 99.6 108 1 30.0-156 8.09 27
1,1-Dichloropropene 5.00 U 5.51 6.08 110 122 1 25.0-158 9.84 27
1,3-Dichloropropane 5.00 U 5.33 5.54 107 111 1 38.0-147 3.86 27
2,2-Dichloropropane 5.00 U 5.14 6.16 103 123 1 24.0-152 18.1 29
Di-isopropyl ether 5.00 U 4.40 4.57 88.0 91.4 1 21.0-160 3.79 28
Ethylbenzene 5.00 9.40 13.5 12.9 82.0 70.0 1 30.0-155 4.55 27
Hexachloro-1,3-butadiene 5.00 U 5.75 5.90 115 118 1 20.0-154 2.58 34
Isopropylbenzene 5.00 12.0 20.4 19.2 168 144 1 28.0-157 J5 6.06 27
p-Isopropyltoluene 5.00 0.979 7.60 7.75 132 135 1 30.0-154 1.95 29
2-Butanone (MEK)25.0 U 29.6 28.8 118 115 1 10.0-160 2.74 32
Methylene Chloride 5.00 U 4.87 5.30 97.4 106 1 23.0-144 8.46 28
4-Methyl-2-pentanone (MIBK)25.0 U 24.5 24.8 98.0 99.2 1 29.0-160 1.22 29
Methyl tert-butyl ether 5.00 2.41 7.40 7.67 99.8 105 1 28.0-150 3.58 29
Naphthalene 5.00 13.1 9.66 9.70 0.000 0.000 1 12.0-156 J6 J6 0.413 35
n-Propylbenzene 5.00 34.9 45.5 42.0 212 142 1 31.0-154 V 8.00 28
Styrene 5.00 U 4.93 5.32 98.6 106 1 33.0-155 7.61 28
1,1,1,2-Tetrachloroethane 5.00 U 5.33 5.75 107 115 1 36.0-151 7.58 29
1,1,2,2-Tetrachloroethane 5.00 U 5.64 5.77 113 115 1 33.0-150 2.28 28
Tetrachloroethene 5.00 U 5.90 6.63 118 133 1 10.0-160 11.7 27
Toluene 5.00 0.370 5.83 6.30 109 119 1 26.0-154 7.75 28
1,2,3-Trichlorobenzene 5.00 U 5.36 5.63 107 113 1 17.0-150 4.91 36
1,2,4-Trichlorobenzene 5.00 U 5.24 5.49 105 110 1 24.0-150 4.66 33
1,1,1-Trichloroethane 5.00 U 6.73 6.90 135 138 1 23.0-160 2.49 28
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG2147488
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 L1662774-03,04,05
L1663275-04 Original Sample (OS) • Matrix Spike (MS) • Matrix Spike Duplicate (MSD)
(OS) L1663275-04 10/09/23 00:26 • (MS) R3983940-4 10/09/23 04:02 • (MSD) R3983940-5 10/09/23 04:24
Spike Amount Original Result MS Result MSD Result MS Rec.MSD Rec.Dilution Rec. Limits MS Qualifier MSD Qualifier RPD RPD Limits
Analyte ug/l ug/l ug/l ug/l %%%%%
1,1,2-Trichloroethane 5.00 U 6.13 6.32 123 126 1 35.0-147 3.05 27
Trichloroethene 5.00 U 5.30 5.84 106 117 1 10.0-160 9.69 25
Trichlorofluoromethane 5.00 U 6.00 7.57 120 151 1 17.0-160 23.1 31
1,2,3-Trichloropropane 5.00 U 6.00 5.92 120 118 1 34.0-151 1.34 29
1,2,4-Trimethylbenzene 5.00 6.35 8.44 8.48 41.8 42.6 1 26.0-154 0.473 27
1,3,5-Trimethylbenzene 5.00 1.41 5.97 6.27 91.2 97.2 1 28.0-153 4.90 27
Vinyl chloride 5.00 U 4.90 5.69 98.0 114 1 10.0-160 14.9 27
o-Xylene 5.00 0.214 5.33 5.65 102 109 1 45.0-144 5.83 26
m&p-Xylenes 10.0 2.82 12.0 12.7 91.8 98.8 1 43.0-146 5.67 26
(S) Toluene-d8 101 103 80.0-120
(S) 4-Bromofluorobenzene 101 101 77.0-126
(S) 1,2-Dichloroethane-d4 108 107 70.0-130
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG2148104
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 L1662774-03,04
Method Blank (MB)
(MB) R3984154-4 10/09/23 23:04
MB Result MB Qualifier MB MDL MB RDL
Analyte ug/l ug/l ug/l
Benzene U 0.0941 1.00
1,2-Dichloroethane U 0.0819 1.00
Ethylbenzene U 0.137 1.00
Toluene U 0.278 1.00
1,2,4-Trimethylbenzene U 0.322 1.00
o-Xylene U 0.174 1.00
m&p-Xylenes U 0.430 2.00
(S) Toluene-d8 117 80.0-120
(S) 4-Bromofluorobenzene 102 77.0-126
(S) 1,2-Dichloroethane-d4 111 70.0-130
Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD)
(LCS) R3984154-1 10/09/23 21:37 • (LCSD) R3984154-2 10/09/23 21:59
Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits
Analyte ug/l ug/l ug/l %%%%%
Benzene 5.00 4.46 4.16 89.2 83.2 70.0-123 6.96 20
1,2-Dichloroethane 5.00 5.13 4.87 103 97.4 70.0-128 5.20 20
Ethylbenzene 5.00 4.84 4.66 96.8 93.2 79.0-123 3.79 20
Toluene 5.00 5.13 4.89 103 97.8 79.0-120 4.79 20
1,2,4-Trimethylbenzene 5.00 5.02 4.79 100 95.8 76.0-121 4.69 20
o-Xylene 5.00 4.67 4.39 93.4 87.8 80.0-122 6.18 20
m&p-Xylenes 10.0 9.21 9.36 92.1 93.6 80.0-122 1.62 20
(S) Toluene-d8 116 117 80.0-120
(S) 4-Bromofluorobenzene 102 103 77.0-126
(S) 1,2-Dichloroethane-d4 115 119 70.0-130
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG2149587
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 L1662774-01,02
Method Blank (MB)
(MB) R3985310-3 10/11/23 21:45
MB Result MB Qualifier MB MDL MB RDL
Analyte ug/l ug/l ug/l
Acetone U 11.3 50.0
Acrolein U 2.54 50.0
Acrylonitrile U 0.671 10.0
Benzene U 0.0941 1.00
Bromobenzene U 0.118 1.00
Bromodichloromethane U 0.136 1.00
Bromoform U 0.129 1.00
Bromomethane U 0.605 5.00
n-Butylbenzene U 0.157 1.00
sec-Butylbenzene U 0.125 1.00
tert-Butylbenzene U 0.127 1.00
Carbon tetrachloride U 0.128 1.00
Chlorobenzene U 0.116 1.00
Chlorodibromomethane U 0.140 1.00
Chloroethane U 0.192 5.00
Chloroform U 0.111 5.00
Chloromethane U 0.960 2.50
2-Chlorotoluene U 0.106 1.00
4-Chlorotoluene U 0.114 1.00
1,2-Dibromo-3-Chloropropane U 0.276 5.00
1,2-Dibromoethane U 0.126 1.00
Dibromomethane U 0.122 1.00
1,2-Dichlorobenzene U 0.107 1.00
1,3-Dichlorobenzene U 0.110 1.00
1,4-Dichlorobenzene U 0.120 1.00
Dichlorodifluoromethane U 0.374 5.00
1,1-Dichloroethane U 0.100 1.00
1,2-Dichloroethane U 0.0819 1.00
1,1-Dichloroethene U 0.188 1.00
cis-1,2-Dichloroethene U 0.126 1.00
trans-1,2-Dichloroethene U 0.149 1.00
1,2-Dichloropropane U 0.149 1.00
1,1-Dichloropropene U 0.142 1.00
1,3-Dichloropropane U 0.110 1.00
2,2-Dichloropropane U 0.161 1.00
Di-isopropyl ether U 0.105 1.00
Ethylbenzene U 0.137 1.00
Hexachloro-1,3-butadiene U 0.337 1.00
Isopropylbenzene U 0.105 1.00
p-Isopropyltoluene U 0.120 1.00
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG2149587
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 L1662774-01,02
Method Blank (MB)
(MB) R3985310-3 10/11/23 21:45
MB Result MB Qualifier MB MDL MB RDL
Analyte ug/l ug/l ug/l
2-Butanone (MEK)U 1.19 10.0
Methylene Chloride U 0.430 5.00
4-Methyl-2-pentanone (MIBK)U 0.478 10.0
Methyl tert-butyl ether U 0.101 1.00
Naphthalene U 1.00 5.00
n-Propylbenzene U 0.0993 1.00
Styrene U 0.118 1.00
1,1,1,2-Tetrachloroethane U 0.147 1.00
1,1,2,2-Tetrachloroethane U 0.133 1.00
Tetrachloroethene U 0.300 1.00
Toluene U 0.278 1.00
1,2,3-Trichlorobenzene U 0.230 1.00
1,2,4-Trichlorobenzene U 0.481 1.00
1,1,1-Trichloroethane U 0.149 1.00
1,1,2-Trichloroethane U 0.158 1.00
Trichloroethene U 0.190 1.00
Trichlorofluoromethane U 0.160 5.00
1,2,3-Trichloropropane U 0.237 2.50
1,2,4-Trimethylbenzene U 0.322 1.00
1,3,5-Trimethylbenzene U 0.104 1.00
Vinyl chloride U 0.234 1.00
o-Xylene U 0.174 1.00
m&p-Xylenes U 0.430 2.00
(S) Toluene-d8 108 80.0-120
(S) 4-Bromofluorobenzene 96.1 77.0-126
(S) 1,2-Dichloroethane-d4 112 70.0-130
Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD)
(LCS) R3985310-1 10/11/23 20:44 • (LCSD) R3985310-2 10/11/23 21:05
Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits
Analyte ug/l ug/l ug/l %%%%%
Acetone 25.0 27.6 28.8 110 115 19.0-160 4.26 27
Acrolein 25.0 20.4 20.5 81.6 82.0 10.0-160 0.489 26
Acrylonitrile 25.0 27.8 27.5 111 110 55.0-149 1.08 20
Benzene 5.00 5.33 5.26 107 105 70.0-123 1.32 20
Bromobenzene 5.00 5.07 5.28 101 106 73.0-121 4.06 20
Bromodichloromethane 5.00 5.31 5.55 106 111 75.0-120 4.42 20
Bromoform 5.00 4.75 5.19 95.0 104 68.0-132 8.85 20
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG2149587
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 L1662774-01,02
Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD)
(LCS) R3985310-1 10/11/23 20:44 • (LCSD) R3985310-2 10/11/23 21:05
Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits
Analyte ug/l ug/l ug/l %%%%%
Bromomethane 5.00 3.28 3.76 65.6 75.2 10.0-160 13.6 25
n-Butylbenzene 5.00 4.60 4.90 92.0 98.0 73.0-125 6.32 20
sec-Butylbenzene 5.00 5.17 5.35 103 107 75.0-125 3.42 20
tert-Butylbenzene 5.00 5.10 5.42 102 108 76.0-124 6.08 20
Carbon tetrachloride 5.00 5.80 5.81 116 116 68.0-126 0.172 20
Chlorobenzene 5.00 5.19 5.27 104 105 80.0-121 1.53 20
Chlorodibromomethane 5.00 5.30 5.04 106 101 77.0-125 5.03 20
Chloroethane 5.00 5.46 5.47 109 109 47.0-150 0.183 20
Chloroform 5.00 5.45 5.27 109 105 73.0-120 3.36 20
Chloromethane 5.00 6.01 6.10 120 122 41.0-142 1.49 20
2-Chlorotoluene 5.00 5.13 5.20 103 104 76.0-123 1.36 20
4-Chlorotoluene 5.00 4.98 5.04 99.6 101 75.0-122 1.20 20
1,2-Dibromo-3-Chloropropane 5.00 4.29 4.66 85.8 93.2 58.0-134 8.27 20
1,2-Dibromoethane 5.00 5.01 5.13 100 103 80.0-122 2.37 20
Dibromomethane 5.00 5.15 5.23 103 105 80.0-120 1.54 20
1,2-Dichlorobenzene 5.00 4.96 5.31 99.2 106 79.0-121 6.82 20
1,3-Dichlorobenzene 5.00 5.06 5.19 101 104 79.0-120 2.54 20
1,4-Dichlorobenzene 5.00 4.83 5.18 96.6 104 79.0-120 6.99 20
Dichlorodifluoromethane 5.00 5.67 5.65 113 113 51.0-149 0.353 20
1,1-Dichloroethane 5.00 5.47 5.58 109 112 70.0-126 1.99 20
1,2-Dichloroethane 5.00 5.40 5.62 108 112 70.0-128 3.99 20
1,1-Dichloroethene 5.00 5.60 5.70 112 114 71.0-124 1.77 20
cis-1,2-Dichloroethene 5.00 5.28 5.14 106 103 73.0-120 2.69 20
trans-1,2-Dichloroethene 5.00 5.31 5.33 106 107 73.0-120 0.376 20
1,2-Dichloropropane 5.00 5.29 5.36 106 107 77.0-125 1.31 20
1,1-Dichloropropene 5.00 5.46 5.45 109 109 74.0-126 0.183 20
1,3-Dichloropropane 5.00 5.47 5.35 109 107 80.0-120 2.22 20
2,2-Dichloropropane 5.00 5.06 5.22 101 104 58.0-130 3.11 20
Di-isopropyl ether 5.00 5.36 5.49 107 110 58.0-138 2.40 20
Ethylbenzene 5.00 5.14 5.02 103 100 79.0-123 2.36 20
Hexachloro-1,3-butadiene 5.00 5.11 5.41 102 108 54.0-138 5.70 20
Isopropylbenzene 5.00 5.16 5.20 103 104 76.0-127 0.772 20
p-Isopropyltoluene 5.00 5.24 5.42 105 108 76.0-125 3.38 20
2-Butanone (MEK)25.0 24.0 25.1 96.0 100 44.0-160 4.48 20
Methylene Chloride 5.00 5.41 5.37 108 107 67.0-120 0.742 20
4-Methyl-2-pentanone (MIBK)25.0 26.3 26.6 105 106 68.0-142 1.13 20
Methyl tert-butyl ether 5.00 5.27 5.12 105 102 68.0-125 2.89 20
Naphthalene 5.00 2.81 2.87 56.2 57.4 54.0-135 2.11 20
n-Propylbenzene 5.00 5.12 5.32 102 106 77.0-124 3.83 20
Styrene 5.00 4.88 5.15 97.6 103 73.0-130 5.38 20
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG2149587
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 L1662774-01,02
Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD)
(LCS) R3985310-1 10/11/23 20:44 • (LCSD) R3985310-2 10/11/23 21:05
Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits
Analyte ug/l ug/l ug/l %%%%%
1,1,1,2-Tetrachloroethane 5.00 5.37 5.44 107 109 75.0-125 1.30 20
1,1,2,2-Tetrachloroethane 5.00 5.18 4.88 104 97.6 65.0-130 5.96 20
Tetrachloroethene 5.00 5.35 5.49 107 110 72.0-132 2.58 20
Toluene 5.00 5.16 5.16 103 103 79.0-120 0.000 20
1,2,3-Trichlorobenzene 5.00 4.19 4.81 83.8 96.2 50.0-138 13.8 20
1,2,4-Trichlorobenzene 5.00 4.39 4.42 87.8 88.4 57.0-137 0.681 20
1,1,1-Trichloroethane 5.00 5.76 5.79 115 116 73.0-124 0.519 20
1,1,2-Trichloroethane 5.00 4.96 5.15 99.2 103 80.0-120 3.76 20
Trichloroethene 5.00 5.48 5.52 110 110 78.0-124 0.727 20
Trichlorofluoromethane 5.00 6.43 6.46 129 129 59.0-147 0.465 20
1,2,3-Trichloropropane 5.00 5.44 5.33 109 107 73.0-130 2.04 20
1,2,4-Trimethylbenzene 5.00 5.03 5.19 101 104 76.0-121 3.13 20
1,3,5-Trimethylbenzene 5.00 4.92 5.20 98.4 104 76.0-122 5.53 20
Vinyl chloride 5.00 5.74 5.93 115 119 67.0-131 3.26 20
o-Xylene 5.00 5.10 5.23 102 105 80.0-122 2.52 20
m&p-Xylenes 10.0 10.1 10.3 101 103 80.0-122 1.96 20
(S) Toluene-d8 106 105 80.0-120
(S) 4-Bromofluorobenzene 104 102 77.0-126
(S) 1,2-Dichloroethane-d4 114 113 70.0-130
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG2150096
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 L1662774-02
Method Blank (MB)
(MB) R3986027-3 10/12/23 16:08
MB Result MB Qualifier MB MDL MB RDL
Analyte ug/l ug/l ug/l
Benzene U 0.0941 1.00
(S) Toluene-d8 112 80.0-120
(S) 4-Bromofluorobenzene 104 77.0-126
(S) 1,2-Dichloroethane-d4 107 70.0-130
Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD)
(LCS) R3986027-1 10/12/23 15:07 • (LCSD) R3986027-2 10/12/23 15:27
Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits
Analyte ug/l ug/l ug/l %%%%%
Benzene 5.00 5.71 5.67 114 113 70.0-123 0.703 20
(S) Toluene-d8 107 107 80.0-120
(S) 4-Bromofluorobenzene 104 104 77.0-126
(S) 1,2-Dichloroethane-d4 108 109 70.0-130
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG2150753
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 L1662774-06
Method Blank (MB)
(MB) R3987131-3 10/13/23 18:30
MB Result MB Qualifier MB MDL MB RDL
Analyte ug/l ug/l ug/l
Bromomethane U 0.605 5.00
Naphthalene U 1.00 5.00
1,2,4-Trichlorobenzene U 0.481 1.00
(S) Toluene-d8 104 80.0-120
(S) 4-Bromofluorobenzene 94.4 77.0-126
(S) 1,2-Dichloroethane-d4 92.8 70.0-130
Laboratory Control Sample (LCS)
(LCS) R3987131-1 10/13/23 16:48
Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier
Analyte ug/l ug/l %%
Bromomethane 5.00 5.42 108 10.0-160
Naphthalene 5.00 4.83 96.6 54.0-135
1,2,4-Trichlorobenzene 5.00 5.34 107 57.0-137
(S) Toluene-d8 101 80.0-120
(S) 4-Bromofluorobenzene 93.5 77.0-126
(S) 1,2-Dichloroethane-d4 93.8 70.0-130
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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GLOSSARY OF TERMS
Guide to Reading and Understanding Your Laboratory Report
The information below is designed to better explain the various terms used in your report of analytical results from the Laboratory. This is not
intended as a comprehensive explanation, and if you have additional questions please contact your project representative.
Results Disclaimer - Information that may be provided by the customer, and contained within this report, include Permit Limits, Project Name,
Sample ID, Sample Matrix, Sample Preservation, Field Blanks, Field Spikes, Field Duplicates, On-Site Data, Sampling Collection Dates/Times, and
Sampling Location. Results relate to the accuracy of this information provided, and as the samples are received.
Abbreviations and Definitions
MDL Method Detection Limit.
RDL Reported Detection Limit.
Rec.Recovery.
RPD Relative Percent Difference.
SDG Sample Delivery Group.
(S)
Surrogate (Surrogate Standard) - Analytes added to every blank, sample, Laboratory Control Sample/Duplicate and
Matrix Spike/Duplicate; used to evaluate analytical efficiency by measuring recovery. Surrogates are not expected to be
detected in all environmental media.
U Not detected at the Reporting Limit (or MDL where applicable).
Analyte The name of the particular compound or analysis performed. Some Analyses and Methods will have multiple analytes
reported.
Dilution
If the sample matrix contains an interfering material, the sample preparation volume or weight values differ from the
standard, or if concentrations of analytes in the sample are higher than the highest limit of concentration that the
laboratory can accurately report, the sample may be diluted for analysis. If a value different than 1 is used in this field, the
result reported has already been corrected for this factor.
Limits
These are the target % recovery ranges or % difference value that the laboratory has historically determined as normal
for the method and analyte being reported. Successful QC Sample analysis will target all analytes recovered or
duplicated within these ranges.
Original Sample The non-spiked sample in the prep batch used to determine the Relative Percent Difference (RPD) from a quality control
sample. The Original Sample may not be included within the reported SDG.
Qualifier
This column provides a letter and/or number designation that corresponds to additional information concerning the result
reported. If a Qualifier is present, a definition per Qualifier is provided within the Glossary and Definitions page and
potentially a discussion of possible implications of the Qualifier in the Case Narrative if applicable.
Result
The actual analytical final result (corrected for any sample specific characteristics) reported for your sample. If there was
no measurable result returned for a specific analyte, the result in this column may state “ND” (Not Detected) or “BDL”
(Below Detectable Levels). The information in the results column should always be accompanied by either an MDL
(Method Detection Limit) or RDL (Reporting Detection Limit) that defines the lowest value that the laboratory could detect
or report for this analyte.
Uncertainty
(Radiochemistry)Confidence level of 2 sigma.
Case Narrative (Cn)
A brief discussion about the included sample results, including a discussion of any non-conformances to protocol
observed either at sample receipt by the laboratory from the field or during the analytical process. If present, there will
be a section in the Case Narrative to discuss the meaning of any data qualifiers used in the report.
Quality Control
Summary (Qc)
This section of the report includes the results of the laboratory quality control analyses required by procedure or
analytical methods to assist in evaluating the validity of the results reported for your samples. These analyses are not
being performed on your samples typically, but on laboratory generated material.
Sample Chain of
Custody (Sc)
This is the document created in the field when your samples were initially collected. This is used to verify the time and
date of collection, the person collecting the samples, and the analyses that the laboratory is requested to perform. This
chain of custody also documents all persons (excluding commercial shippers) that have had control or possession of the
samples from the time of collection until delivery to the laboratory for analysis.
Sample Results (Sr)
This section of your report will provide the results of all testing performed on your samples. These results are provided
by sample ID and are separated by the analyses performed on each sample. The header line of each analysis section for
each sample will provide the name and method number for the analysis reported.
Sample Summary (Ss)This section of the Analytical Report defines the specific analyses performed for each sample ID, including the dates and
times of preparation and/or analysis.
Qualifier Description
C4 The reported concentration is an estimate. The continuing calibration standard associated with this data responded low.
Data is likely to show a low bias concerning the result.
J The identification of the analyte is acceptable; the reported value is an estimate.
J1 Surrogate recovery limits have been exceeded; values are outside upper control limits.
J3 The associated batch QC was outside the established quality control range for precision.
J5 The sample matrix interfered with the ability to make any accurate determination; spike value is high.
J6 The sample matrix interfered with the ability to make any accurate determination; spike value is low.
V The sample concentration is too high to evaluate accurate spike recoveries.
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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Pace Analytical National 12065 Lebanon Rd Mount Juliet, TN 37122
Alabama 40660 Nebraska NE-OS-15-05
Alaska 17-026 Nevada TN000032021-1
Arizona AZ0612 New Hampshire 2975
Arkansas 88-0469 New Jersey–NELAP TN002
California 2932 New Mexico ¹TN00003
Colorado TN00003 New York 11742
Connecticut PH-0197 North Carolina Env375
Florida E87487 North Carolina ¹DW21704
Georgia NELAP North Carolina ³41
Georgia ¹923 North Dakota R-140
Idaho TN00003 Ohio–VAP CL0069
Illinois 200008 Oklahoma 9915
Indiana C-TN-01 Oregon TN200002
Iowa 364 Pennsylvania 68-02979
Kansas E-10277 Rhode Island LAO00356
Kentucky ¹ ⁶KY90010 South Carolina 84004002
Kentucky ²16 South Dakota n/a
Louisiana AI30792 Tennessee ¹ ⁴2006
Louisiana LA018 Texas T104704245-20-18
Maine TN00003 Texas ⁵LAB0152
Maryland 324 Utah TN000032021-11
Massachusetts M-TN003 Vermont VT2006
Michigan 9958 Virginia 110033
Minnesota 047-999-395 Washington C847
Mississippi TN00003 West Virginia 233
Missouri 340 Wisconsin 998093910
Montana CERT0086 Wyoming A2LA
A2LA – ISO 17025 1461.01 AIHA-LAP,LLC EMLAP 100789
A2LA – ISO 17025 ⁵1461.02 DOD 1461.01
Canada 1461.01 USDA P330-15-00234
EPA–Crypto TN00003
ACCREDITATIONS & LOCATIONS

¹ Drinking Water ² Underground Storage Tanks ³ Aquatic Toxicity ⁴ Chemical/Microbiological ⁵ Mold ⁶ Wastewater n/a Accreditation not applicable
* Not all certifications held by the laboratory are applicable to the results reported in the attached report.
* Accreditation is only applicable to the test methods specified on each scope of accreditation held by Pace Analytical.
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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K&L Grocery

ATC Project No. STL0388001 NCDEQ State Lead Program
APPENDIX H

GSI MANN-KENDALL TOOLKITS
Evaluation Date:Job ID:
Facility Name:Constituent:
Conducted By:Concentration Units:ug/L
Sampling Point ID:Benzene Toluene Ethylbenzene Total Xylenes EDB 1,2-DCA
Sampling Sampling
Event Date
1 08/22/00 8,000 5,800 690 125 1,600
2 04/26/01 18,000 28,000 2,600 14,300 940 3,600
3 06/29/01 18,300 17,100 1,410 9,810
4 06/29/01 20,900 19,500 4,060 13,420
5 07/30/21 13,800 26,700 1,760 12,600 855J 2,930
6 11/28/01 12,300 19,400 1,440 11,100 769 2,940
7 10/03/03 14,000 290 1,900 12,700 1,240 4.0
8 04/29/10 14,800 25,000 2,130 13,430 890 2,720
9 05/17/11 14,700 26,200 2,250 7,200 3,760
10 10/12/11 16,500 28,200 2,480 16,180 4,550
11 05/31/12 12,600 21,100 2,080 12,830 1,030 2,800
12 05/18/15 5,700 15,000 1,800 13,900 390 46
13 02/17/16 11,000 21,000 2,000 13,100 640 4.35
14 06/16/16 8,200 13,000 1,000 8,800 660 1,400
15 12/13/16 8,400 14,000 1,400 11,300 660 1,900
16 06/28/18 660 530 210 1,160 46 120
17 12/17/19 1,820 3,090 170 2,900 50 437
18 06/14/21 9,130 16,600 1,420 10,390 617 1,640
19 09/29/23 15,800 34,100 3,800 21,370 1,130 1,130
20
Coefficient of Variation:0.46 0.55 0.55 0.40 0.59 0.78
Mann-Kendall Statistic (S):-61 -21 -27 -21 -16 -34
Confidence Factor:98.3%75.5%81.6%77.3%79.1%91.2%
Concentration Trend:Decreasing Stable Stable Stable Stable Prob. Decreasing
Notes:
1.At least four independent sampling events per well are required for calculating the trend. Methodology is valid for 4 to 40 samples.
2.Confidence in Trend = Confidence (in percent) that constituent concentration is increasing (S>0) or decreasing (S<0): >95% = Increasing or Decreasing;
≥ 90% = Probably Increasing or Probably Decreasing; < 90% and S>0 = No Trend; < 90%, S≤0, and COV ≥ 1 = No Trend; < 90% and COV < 1 = Stable.
3.Methodology based on "MAROS: A Decision Support System for Optimizing Monitoring Plans", J.J. Aziz, M. Ling, H.S. Rifai, C.J. Newell, and J.R. Gonzales,
Ground Water, 41(3):355-367, 2003.
DISCLAIMER: The GSI Mann-Kendall Toolkit is available "as is". Considerable care has been exercised in preparing this software product; however, no party, including without
limitation GSI Environmental Inc., makes any representation or warranty regarding the accuracy, correctness, or completeness of the information contained herein, and no such
party shall be liable for any direct, indirect, consequential, incidental or other damages resulting from the use of this product or the information contained herein. Information in
this publication is subject to change without notice. GSI Environmental Inc., disclaims any responsibility or obligation to update the information contained herein.
MW-1 CONCENTRATION (ug/L)
GSI Environmental Inc., www.gsi-net.com
GSI MANN-KENDALL TOOLKIT
for Constituent Trend Analysis
10/19/2023 Incident #3880
K&L Grocery MW-1
ATC Associates of North Carolina, P.C.
1
10
100
1000
10000
100000
07/98 04/01 01/04 10/06 07/09 04/12 12/14 09/17 06/20 03/23 12/25Concentration (ug/L)Sampling Date
Benzene
Toluene
Ethylbenzene
Total Xylenes
EDB
1,2-DCA
Evaluation Date:Job ID:
Facility Name:Constituent:
Conducted By:Concentration Units:ug/L
Sampling Point ID:Benzene Toluene Ethylbenzene Total Xylenes EDB 1,2-DCA
Sampling Sampling
Event Date
1 04/26/01 210 30 69 830 1 4
2 06/29/01 732 17.4 29.3 1,640
3 06/29/01 773 23.8 33.4 1,575
4 07/30/01 252 9 27.9 955 5 5
5 11/28/01 8.2 1.3 0.5 12.5 1 1
6 10/03/03 570 0.25 71 1,990 0.3 15.0
7 04/29/10 757 87.5 84.1 1,089 22
8 10/12/11 676 13.6 39.9 363.7 0.25
9 05/31/12 414 3.4 3.4 347.1 6.1 0.25
10 05/18/15 310 1.4 1 217 6.1 0.25
11 06/16/16 320 1 1 158.8 4.8 0.425
12 12/13/16 410 6.7 30 54 1.25 1.25
13 06/28/18 470 4.7 11 137 3.5 0.2
14 12/17/19 23.6 0.25 0.94 10 0.25 0.25
15 09/29/23 257 1.48 1.03 1.72 0.5 25.1
16
17
18
19
20
Coefficient of Variation:0.61 1.67 1.06 1.08 0.92 1.56
Mann-Kendall Statistic (S):-19 -43 -37 -69 -10 -14
Confidence Factor:81.0%98.2%96.3%>99.9%75.3%78.2%
Concentration Trend:Stable Decreasing Decreasing Decreasing Stable No Trend
Notes:
1.At least four independent sampling events per well are required for calculating the trend. Methodology is valid for 4 to 40 samples.
2.Confidence in Trend = Confidence (in percent) that constituent concentration is increasing (S>0) or decreasing (S<0): >95% = Increasing or Decreasing;
≥ 90% = Probably Increasing or Probably Decreasing; < 90% and S>0 = No Trend; < 90%, S≤0, and COV ≥ 1 = No Trend; < 90% and COV < 1 = Stable.
3.Methodology based on "MAROS: A Decision Support System for Optimizing Monitoring Plans", J.J. Aziz, M. Ling, H.S. Rifai, C.J. Newell, and J.R. Gonzales,
Ground Water, 41(3):355-367, 2003.
DISCLAIMER: The GSI Mann-Kendall Toolkit is available "as is". Considerable care has been exercised in preparing this software product; however, no party, including without
limitation GSI Environmental Inc., makes any representation or warranty regarding the accuracy, correctness, or completeness of the information contained herein, and no such
party shall be liable for any direct, indirect, consequential, incidental or other damages resulting from the use of this product or the information contained herein. Information in
this publication is subject to change without notice. GSI Environmental Inc., disclaims any responsibility or obligation to update the information contained herein.
MW-2 CONCENTRATION (ug/L)
GSI Environmental Inc., www.gsi-net.com
GSI MANN-KENDALL TOOLKIT
for Constituent Trend Analysis
10/19/2023 Incident #3880
K&L Grocery MW-2
ATC Associates of North Carolina, P.C.
0.1
1
10
100
1000
10000
01/00 09/13 05/27 01/41 10/54 06/68 02/82 10/95 07/09 03/23 11/36Concentration (ug/L)Sampling Date
Benzene
Toluene
Ethylbenzene
Total Xylenes
EDB
1,2-DCA
Evaluation Date:Job ID:
Facility Name:Constituent:
Conducted By:Concentration Units:ug/L
Sampling Point ID:Benzene Toluene Ethylbenzene Total Xylenes EDB 1,2-DCA
Sampling Sampling
Event Date
1 08/22/00 1,400 24,000 1000 5650
2 04/26/01 1,700 33,000 3,500 16,600 40 40
3 07/30/01 12,900 24,500 2,210 13,100 500 500
4 11/28/01 15,100 35,200 2,190 12,800 500 500
5 10/03/03 1,400 23,000 2,000 10,800 6.0 6.0
6 04/29/10 11,300 21,400 1,980 11,650
7 05/17/11 2,480 19,000 4,530 26,350 0.5 1,530
8 10/12/11 3,390 11,100 1,420 12,260 0.5 1,080
9 05/31/12 2,230 7,610 985 8,370 232 834
10 05/18/15 2,300 2,600 1,300 2,730 17 420
11 02/17/16 9,300 19,000 2,000 10,600 430 19.5
12 06/16/16 1,900 2,700 430 3,300 120 380
13 12/13/16 2,200 4,500 780 3,500 110 340
14 06/28/18 1,200 1,900 850 3,040 6 12.5
15 12/17/19 22.8 3.9 15.1 32.1 0.25 1.5
16 06/14/21 411 498 433 1,686 12.5 7.82
17 09/29/23 901 920 770 2,818 0.5 14.5
18
19
20
Coefficient of Variation:1.16 0.88 0.74 0.79 1.45 1.22
Mann-Kendall Statistic (S):-55 -107 -81 -82 -34 -44
Confidence Factor:98.8%>99.9%>99.9%>99.9%94.9%98.4%
Concentration Trend:Decreasing Decreasing Decreasing Decreasing Prob. Decreasing Decreasing
Notes:
1.At least four independent sampling events per well are required for calculating the trend. Methodology is valid for 4 to 40 samples.
2.Confidence in Trend = Confidence (in percent) that constituent concentration is increasing (S>0) or decreasing (S<0): >95% = Increasing or Decreasing;
≥ 90% = Probably Increasing or Probably Decreasing; < 90% and S>0 = No Trend; < 90%, S≤0, and COV ≥ 1 = No Trend; < 90% and COV < 1 = Stable.
3.Methodology based on "MAROS: A Decision Support System for Optimizing Monitoring Plans", J.J. Aziz, M. Ling, H.S. Rifai, C.J. Newell, and J.R. Gonzales,
Ground Water, 41(3):355-367, 2003.
DISCLAIMER: The GSI Mann-Kendall Toolkit is available "as is". Considerable care has been exercised in preparing this software product; however, no party, including without
limitation GSI Environmental Inc., makes any representation or warranty regarding the accuracy, correctness, or completeness of the information contained herein, and no such
party shall be liable for any direct, indirect, consequential, incidental or other damages resulting from the use of this product or the information contained herein. Information in
this publication is subject to change without notice. GSI Environmental Inc., disclaims any responsibility or obligation to update the information contained herein.
MW-6/6R CONCENTRATION (ug/L)
GSI Environmental Inc., www.gsi-net.com
GSI MANN-KENDALL TOOLKIT
for Constituent Trend Analysis
10/19/2023 Incident #3880
K&L Grocery MW-6/6R
ATC Associates of North Carolina, P.C.
0.1
1
10
100
1000
10000
100000
07/98 04/01 01/04 10/06 07/09 04/12 12/14 09/17 06/20 03/23 12/25Concentration (ug/L)Sampling Date
Benzene
Toluene
Ethylbenzene
Total Xylenes
EDB
1,2-DCA
Evaluation Date:Job ID:
Facility Name:Constituent:
Conducted By:Concentration Units:ug/L
Sampling Point ID:Benzene Toluene Ethylbenzene Total Xylenes EDB 1,2-DCA
Sampling Sampling
Event Date
1 08/22/00 7,600 5,600 830 2,700
2 04/26/01 10,000 1,900 1,100 4,000 20 20
3 06/29/01 10,800 1,100 768 2,590
4 06/29/01 13,700 1,410 853 2,980
5 07/30/01 6,630 789 250 2,460 250 250
6 11/28/01 7,220 212 517 2,190 50 50
7 10/03/03 7,900 330 1,000 2,400 4.0 4.0
8 04/29/10 5,740 342 497 472.4 837
9 10/12/11 7,230 2,530 732 1,756 801
10 05/31/12 7,340 2,040 972 2,990 791
11 12/13/16 6,700 100 550 540 2.5 560
12 06/14/21 2,400 65.7 160 229 25 203
13 09/29/23 1,090 40.2 100 267 0.5 255
14
15
16
17
18
19
20
Coefficient of Variation:0.45 1.22 0.51 0.62 1.79 0.90
Mann-Kendall Statistic (S):-40 -42 -32 -48 -11 7
Confidence Factor:99.3%99.5%97.1%99.9%93.2%70.0%
Concentration Trend:Decreasing Decreasing Decreasing Decreasing Prob. Decreasing No Trend
Notes:
1.At least four independent sampling events per well are required for calculating the trend. Methodology is valid for 4 to 40 samples.
2.Confidence in Trend = Confidence (in percent) that constituent concentration is increasing (S>0) or decreasing (S<0): >95% = Increasing or Decreasing;
≥ 90% = Probably Increasing or Probably Decreasing; < 90% and S>0 = No Trend; < 90%, S≤0, and COV ≥ 1 = No Trend; < 90% and COV < 1 = Stable.
3.Methodology based on "MAROS: A Decision Support System for Optimizing Monitoring Plans", J.J. Aziz, M. Ling, H.S. Rifai, C.J. Newell, and J.R. Gonzales,
Ground Water, 41(3):355-367, 2003.
DISCLAIMER: The GSI Mann-Kendall Toolkit is available "as is". Considerable care has been exercised in preparing this software product; however, no party, including without
limitation GSI Environmental Inc., makes any representation or warranty regarding the accuracy, correctness, or completeness of the information contained herein, and no such
party shall be liable for any direct, indirect, consequential, incidental or other damages resulting from the use of this product or the information contained herein. Information in
this publication is subject to change without notice. GSI Environmental Inc., disclaims any responsibility or obligation to update the information contained herein.
MW-8 CONCENTRATION (ug/L)
GSI Environmental Inc., www.gsi-net.com
GSI MANN-KENDALL TOOLKIT
for Constituent Trend Analysis
10/19/2023 Incident #3880
K&L Grocery MW-8
ATC Associates of North Carolina, P.C.
0.1
1
10
100
1000
10000
100000
07/98 04/01 01/04 10/06 07/09 04/12 12/14 09/17 06/20 03/23 12/25Concentration (ug/L)Sampling Date
Benzene
Toluene
Ethylbenzene
Total Xylenes
EDB
1,2-DCA
Evaluation Date:Job ID:
Facility Name:Constituent:
Conducted By:Concentration Units:ug/L
Sampling Point ID:Benzene Toluene Ethylbenzene Total Xylenes EDB 1,2-DCA
Sampling Sampling
Event Date
1 10/12/11 12,500 25,800 3,000 18,780 1,590
2 05/31/12 5,830 14,800 1,840 12,920 294 905
3 05/18/15 2,200 9,200 2,300 15,000 130 330
4 02/17/16 760 1,300 820 4,500 1.5 2
5 06/16/16 170 310 57 350 20 49
6 12/13/16 85 52 25 147 5.5 30
7 06/28/18 180 14 120 122 0.43 19
8 12/17/19 74.9 12.4 54.0 41.5 0.25 9.8
9 09/29/23 181 17.6 35.8 62.6 0.641 18.0
10
11
12
13
14
15
16
17
18
19
20
Coefficient of Variation:1.73 1.61 1.27 1.32 1.87 1.70
Mann-Kendall Statistic (S):-24 -32 -26 -32 -20 -24
Confidence Factor:99.4%>99.9%99.7%>99.9%99.3%99.4%
Concentration Trend:Decreasing Decreasing Decreasing Decreasing Decreasing Decreasing
Notes:
1.At least four independent sampling events per well are required for calculating the trend. Methodology is valid for 4 to 40 samples.
2.Confidence in Trend = Confidence (in percent) that constituent concentration is increasing (S>0) or decreasing (S<0): >95% = Increasing or Decreasing;
≥ 90% = Probably Increasing or Probably Decreasing; < 90% and S>0 = No Trend; < 90%, S≤0, and COV ≥ 1 = No Trend; < 90% and COV < 1 = Stable.
3.Methodology based on "MAROS: A Decision Support System for Optimizing Monitoring Plans", J.J. Aziz, M. Ling, H.S. Rifai, C.J. Newell, and J.R. Gonzales,
Ground Water, 41(3):355-367, 2003.
DISCLAIMER: The GSI Mann-Kendall Toolkit is available "as is". Considerable care has been exercised in preparing this software product; however, no party, including without
limitation GSI Environmental Inc., makes any representation or warranty regarding the accuracy, correctness, or completeness of the information contained herein, and no such
party shall be liable for any direct, indirect, consequential, incidental or other damages resulting from the use of this product or the information contained herein. Information in
this publication is subject to change without notice. GSI Environmental Inc., disclaims any responsibility or obligation to update the information contained herein.
MW-9 CONCENTRATION (ug/L)
GSI Environmental Inc., www.gsi-net.com
GSI MANN-KENDALL TOOLKIT
for Constituent Trend Analysis
10/19/2023 Incident #3880
K&L Grocery MW-9
ATC Associates of North Carolina, P.C.
0.1
1
10
100
1000
10000
100000
11/10 04/12 08/13 12/14 05/16 09/17 02/19 06/20 10/21 03/23 07/24Concentration (ug/L)Sampling Date
Benzene
Toluene
Ethylbenzene
Total Xylenes
EDB
1,2-DCA