WS-4806_15707_CA_MRP_20230113

2725 East Millbrook Rd
Raleigh, NC 27604
Telephone [phone]
N.C. Engineering License No. C-1598
www.atcgroupservices.com

January 13, 2023

Ms. Ashley Dinkins
Guilford County Department of Health and Human Services
Environmental Health/HERA
400 West Market Street, Suite 300
Greensboro, North Carolina 27401

Re: Groundwater Monitoring Report
Circle K Store #7930 (RM #2681)
3700 Groometown Road
Greensboro, Guilford County, North Carolina
NCDEQ Incident No. 15707
ATC Project No. P662681991

Dear Ms. Dinkins:

ATC Associates of North Carolina, P.C., on behalf of Phillips 66 Company, is submitting the enclosed
Groundwater Monitoring Report for the Circle K Store #7930. This report presents field activities and laboratory
analytical results for a quarterly sampling event conducted in October 2022 and fate and transport modeling
performed in December 2022.

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.
Staff Scientist Senior Project Manager
Direct Line: 919-820-7051 Direct Line: 919-573-1205
Email: [e-mail] Email: [e-mail]

cc: Mr. Ed Kuhn, Contract Program Manager for Phillips 66 Company

Prepared for:

Guilford County Department of Health and Human Services
400 West Market Street, Suite 300
Greensboro, North Carolina 27401

GROUNDWATER MONITORING REPORT
CIRCLE K STORE #7930 (RM #2681)
3700 GROOMETOWN ROAD
GREENSBORO, GUILFORD COUNTY, NORTH CAROLINA

ATC Project No. P662681390

Prepared by:

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

Nicholas Kramer
Staff Scientist
Direct Line: 919-820-7051
Email: [e-mail]

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

January 13, 2023

Circle K Store #7930 (RM #2681)
January 13, 2023
Page i

ATC Project No. P662681991 Phillips 66 Company
Table of Contents
2.0 EXECUTIVE SUMMARY ........................................................................................................................ 2
3.0 INTRODUCTION ..................................................................................................................................... 3
4.0 SITE BACKGROUND ............................................................................................................................ 3
5.0 GROUNDWATER CHARACTERIZATION ........................................................................................... 5
5.1 GEOLOGY AND HYDROGEOLOGY ........................................................................................................................... 5
5.2 GROUNDWATER LEVELS...................................................................................................................................... 6
5.3 GROUNDWATER QUALITY ................................................................................................................................... 7
6.0 GROUNDWATER TREATMENT SYSTEM ......................................................................................... 8
6.1 SYSTEM DESCRIPTION ........................................................................................................................................ 8
6.2 SYSTEM STATUS ................................................................................................................................................ 8
7.0 FATE AND TRANSPORT MODEL ....................................................................................................... 8
8.0 MONITORING PLAN AND SCHEDULE ............................................................................................... 9
9.0 SUMMARY .............................................................................................................................................. 9

TABLES:
Table 1 – Water Supply Well Property Owner Table
Table 2 – Well Construction Details and Historical Water Level Elevations
Table 3 – Groundwater Analytical Data
Table 4 – Historical Groundwater Analytical Data
Table 5 – Contaminant Mass Calculations
Table 6 – Contaminant Mass Removal (Benzene)
Table 7 – Contaminant Mass Removal (MTBE)
Table 8 – Historical Water Supply Well Analytical Data
Table 9 – Historical Soil Analytical Data
Table 10 – Groundwater Exposure Point Concentrations

FIGURES:
Figure 1 – Site Topographic Map
Figure 2 – Site Plan
Figure 3 – Water Supply Well Location Map
Figure 4 – Groundwater Elevation Contour Map
Figure 5 – Dissolved MTBE in Groundwater Map
Figure 6 – Concentration versus Time Graphs
Figure 7 – Remediation System Layout
Figure 8 – Groundwater Source Area

APPENDICES:
Appendix A – Geologic Cross-Sections
Appendix B – Laboratory Analytical Results
Appendix C – Contaminant Mass vs Time
Appendix D – GSI Mann-Kendall Toolkits
Appendix E – NCDEQ Risk Calculator
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January 13, 2023
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ATC Project No. P662681991 Phillips 66 Company
2.0 EXECUTIVE SUMMARY

The project site is located at 3700 Groometown Road in Greensboro, Guilford County, North Carolina. The
property is currently a convenience store and retail petroleum facility operated by Circle K Stores Inc. (Circle
K) since 1988. On April 15, 1996, during underground storage tank (UST) upgrades, a release was reported
to the Winston-Salem Regional Office of the North Carolina Department of Environment and Natural
Resources (NCDENR) currently referred as the North Carolina Department of Environmental Quality
(NCDEQ). Subsequent reports were submitted to NCDEQ including an Initial Abatement Measures and
Site Check (20-day) Report (1996) an Initial Site Characterization (45-day) Report (1996), an Initial Site
Characterization Addendum (1997), and a Comprehensive Site Assessment in 1999. Impacted soil was not
identified above regulatory standards and groundwater impact was delineated. A geologic transect and
geologic cross-sections are included in Appendix A. During the CSA investigation, a receptor survey
identified five water supply wells located within 1,000 feet of the site. The site was classified as a “High
Risk” site. A Corrective Action Plan (CAP) was submitted on December 6, 1999, recommending the
installation of an air sparge and soil vapor extraction system. However, NCDEQ determined that the
proposed treatment system was not required, and that natural attenuation would be an effective alternative
for reducing the contaminant concentrations. Monitored natural attenuation sampling occurred at the site
from 2000 until 2014. On April 3, 2014, a New Technology Cleanup Plan was submitted recommending the
installation of an air sparge and soil vapor extraction system in order to expedite site cleanup. The New
Technology Cleanup Plan was approved by NCDEQ on April 14, 2014. Installation of the remediation
system began on September 17, 2014, and system start up took place on October 30, 2014. On November
5, 2020, NCDEQ issued permit number WI0400556 for the installation of Provectus Oxygen Releasing
Substrate (ORS) sleeves in monitoring well GW13. The ORS sleeves were initially installed on December
22, 2020, and were reinstalled on September 27, 2021, and August 16, 2022, respectively.

Overall, the current dissolved contaminant of concern is limited to methyl tert-butyl ether (MTBE) exceeding
the Title 15A NCAC 02L .0202 Groundwater Quality Standard (2L Standard). The horizontal and vertical
extent of dissolved MTBE concentrations have been reasonably defined and are limited to the vicinity of
monitoring well GW13. In 2014, the dissolved contaminant mass at the site was estimated to cover an area
approximately 14,175 square feet (ft2) resulting in a calculated dissolved MTBE baseline mass of 147.9
kilograms (kg).

Based on the analytical results for the October 2022 quarterly sampling event, volatile organic compounds
(VOCs) were not detected in on-site monitoring well GW09. VOC detections in the samples collected from
off-site monitoring wells GW07 and GW08 were reported below the respective 2L Standards. MTBE was
detected above the 2L Standard in the sample collected from off-site monitoring well GW13.
Circle K Store #7930 (RM #2681)
January 13, 2023
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ATC Project No. P662681991 Phillips 66 Company
The dissolved MTBE mass has effectively been reduced at the site by approximately 99.89%. Since
approximately December 2017, the contaminant mass for benzene has been removed by approximately 100%.
Based on field observations and laboratory analytical results for the on-site monitoring wells, the air sparge
and soil vapor extraction remediation system has been effective in reducing the VOC concentrations below
the 2L Standards on the site property. Therefore, the remediation system was shut down on December 2, 2021.

The MTBE impacts in well GW13 appear stable since remediation system shut down. Based on the results of
the fate and transport modeling using the NCDEQ Risk Calculator, groundwater impacts at the site will not
result in 2L Standard exceedances in the nearest downgradient potable water supply well. Therefore, ATC
recommends moving forward with site closure.

3.0 INTRODUCTION

ATC Associates of North Carolina, P.C. (ATC) was retained by Phillips 66 Company (Phillips 66) to monitor
groundwater quality at the Circle K Store #7930 (RM #2681). The project site is located at 3700 Groometown
Road in Greensboro, Guilford County, North Carolina. Figure 1 represents a site topographic map and Figure
2 represents a site map indicating the site layout. The property is currently a convenience store and retail
petroleum facility. This report presents field activities and laboratory analytical results for the quarterly
groundwater sampling event conducted in October 2022, the status of the on-site remediation system, and
the results of fate and transport modeling for the site.

4.0 SITE BACKGROUND

In October 1988, Circle K began operating the site as a retail gas station. On April 15, 1996, during UST
upgrades, limited quantities of soil and stone with elevated organic vapor analyzer (OVA) readings were
detected on top of the USTs near the fill ports and in the area of the former product piping. This release
was reported to the Winston-Salem Regional Office of the North Carolina Department of Environmental
Quality (NCDEQ). Pursuant to Title 15A, NCAC 2N.0703, an Initial Abatement Measures and Site Check
(20-day) Report was submitted to the NCDEQ on May 15, 1996, and an Initial Site Characterization (45-
day) Report was submitted to the NCDEQ on August 21, 1996.

Based upon the results of the 45-day Report, NCDEQ requested additional information regarding
groundwater quality. On February 12, 1997, a 45-day Report Addendum was submitted to the NCDEQ
summarizing the procedures for data acquisition regarding groundwater quality at the subject site.

After reviewing the 45-day Report Addendum, NCDEQ requested a Comprehensive Site Assessment
(CSA) Report. In response to the CSA request, a Geoprobe groundwater survey was performed on April 4,
Circle K Store #7930 (RM #2681)
January 13, 2023
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ATC Project No. P662681991 Phillips 66 Company
1997. Based on the sampling results, seven type II monitoring wells and one type III monitoring well (GW01
through GW08) were installed during four separate drilling events. The CSA concluded that petroleum
compounds had impacted groundwater. Based on the laboratory results, elevated levels of dissolved
benzene were detected in the groundwater samples from monitoring wells GW01, GW04, GW05, and
GW07. Review of the laboratory data indicated that the downgradient extent of impacted groundwater was
defined. The CSA was submitted on January 29, 1998 and approved on April 13, 1999.

During the CSA investigation, ATC performed a receptor survey within 1,500 feet of the site. The survey
indicated five potable wells on Wayne Road as potential receptors. Samples collected from the wells did
not indicate detectable levels of petroleum hydrocarbons.

A Corrective Action Plan (CAP) was submitted on December 6, 1999. The report recommended utilizing a
remediation system design based on air sparge and soil vapor extraction technology.

On June 25, 2002, a CAP addendum letter was submitted. Based on the groundwater sampling results
over the previous two years, NCDEQ determined that air sparge and soil vapor extraction was not required.
Natural attenuation was chosen as an effective alternative for reducing the contaminant concentrations.
Per NCDEQ’s decision, groundwater sampling events were conducted at the site on a semiannual basis.

In November 2007, ConocoPhillips contracted Delta Environmental Consultants of North Carolina, Inc.
(Delta) to perform environmental consulting services at the site. Delta performed groundwater sampling
events in November 2007, June 2008, August 2009 and January 2011 with subsequent reports submitted
to NCDEQ.

In April 2011, ATC was awarded the ConocoPhillips contract to continue groundwater monitoring activities
at the site. ATC submitted a Semiannual Groundwater Monitoring Report on December 16, 2011,
documenting an aggressive fluid vapor recovery (AFVR) event and a groundwater sampling event
conducted in October 2011. On May 1, 2012, ConocoPhillips separated into two companies, ConocoPhillips
and Phillips 66 Company. Phillips 66 Company manages the environmental remediation activities
associated with this site.

On September 6, 2012, ATC submitted a Groundwater Monitoring Report documenting an AFVR event
performed in May 2012 and an updated receptor survey and groundwater sampling event performed in July
2012. Based on the updated receptor survey, it appears six water supply wells are used for drinking purposes
within 1,000 feet of the site. Water supply well information is included as Table 1 and a receptor survey map
including water supply well locations is presented in Figure 3.

Circle K Store #7930 (RM #2681)
January 13, 2023
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ATC Project No. P662681991 Phillips 66 Company
On April 3, 2014, ATC submitted a New Technology Cleanup Plan (NTCP) to NCDEQ documenting the
proposed air sparge and soil vapor extraction system. The NTCP was approved on April 14, 2014. Installation
of the remediation system began on September 17, 2014, with the installation of two new air sparge wells and
three new soil vapor extraction wells. System start up took place on October 30, 2014.

On October 26, 2020, NCDEQ issued a Notice of Regulatory Requirements requesting the sampling of the
water supply wells located at 4204, 4206, 4208, 4210 and 4217 Wayne Road. No constituents were
detected above the laboratory reporting limit during water supply well sampling.

On October 26, 2020, ATC submitted a Notice of Intent to Construct or Operate Injection Wells for the
installation of ORS socks in GW13. On November 5, 2020, NCDEQ issued permit number WI0400556 for
the ORS socks installation. The ORS socks were initially installed in well GW13 on December 22, 2020.
New ORS socks were installed in GW13 on September 27, 2021, and August 8, 2022, respectively. Based
on field observations and laboratory analytical results for the on-site monitoring wells, the air sparge and soil
vapor extraction remediation system has been effective in reducing the VOC concentrations below the 2L
Standards on the site property. Therefore, the remediation system was shut down on December 2, 2021.

Quarterly and semiannual groundwater sampling events have been conducted from March 2019 through
October 2022.

5.0 GROUNDWATER CHARACTERIZATION

5.1 GEOLOGY AND HYDROGEOLOGY

According to the Web Soil Survey, the predominant site soil is Enon fine sandy loam. Typically, this soil is
composed of fine sandy loam to 8 inches below grade. From approximately 8 to 11 inches below grade,
this soil is typically sandy clay loam, and from approximately 33 to 80 inches below grade, this soil is loam.
The parent material of this soil is saprolite derived from diorite and/or gabbro and/or diabase and/or gneiss.
This soil is well drained, and flooding is rare. Available water capacity is moderate, and the seasonal high-
water table is anticipated to be more than 80 inches bgs. Depth to water at the site has ranged from
approximately 20 to 30 feet bgs.

Based on soils encountered during prior drilling events, the on-site geology consists of asphalt and concrete
pavement from the surface to approximately one foot below grade. From one to 13 feet, the soil on site
consists of a light brown clay and sandy clay with orange or reddish tint. This layer is underlain by clayey
and sandy silt ranging in color from light brown to greenish or yellowish green.

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ATC Project No. P662681991 Phillips 66 Company
The project site is located within the upland section of the Piedmont Physiographic Providence of North
Carolina, and specifically in the Carolina Slate Belt. The Carolina Slate Belt is a major synclinorium, and
related folds, cut by numerous left-lateral faults. According to the Geologic map of North Carolina (1985),
in central North Carolina, the northwestern boundary of the Carolina Slate Belt is the Gold Hill-Silver Hill
fault zone, which separates similar lithologies except for change in metamorphic grade. On its southeastern
flank, the Carolina Slate Belt is bounded by the Raleigh Belt in North Carolina. Between the latter two belts,
rocks of the Carolina Slate Belt continue beneath the Coastal Plain and may connect across the Nutbash
Creek fault zone and around the southern end of the Raleigh Belt to the Eastern Belt (Horton and Zullo,
1991).

The Carolina Slate Belt includes volcanic and sedimentary rocks of Late Proterozoic to Cambrian age that
are metamorphosed to lower greenschist facies and intruded by a variety of plutons. The belt extends 600
kilometers (km) from Virginia to Georgia and reaches a maximum width of 140 km in central North Carolina.
Metavolcanic rocks are mainly pyroclastic and epiclastic; lava flows make up less than 10 percent of the
belt but are common near several volcanic centers. Clasts contained in the volcaniclastic rocks are
dominantly volcanogenic, but nonvolcanic clasts such as quartzite, granite, and gneiss are present in some
units. Stratigraphic sequences are estimated to be as much as 13 km thick (Horton and Zullo, 1991).

During CSA activities, a single well recovery test (rising head test) was performed in monitoring wells GW01,
GW02 and GW05 to estimate the hydraulic conductivity of the sediments in the water table aquifer. The
calculations used are based on the well geometry presented by Bouwer and Rice (1989). A hydraulic
conductivity value of 0.18 ft/day in GW01 was calculated. A hydraulic conductivity value of 0.26 ft/day in
GW02 was calculated. A hydraulic conductivity value of 0.55 ft/day in GW05 was calculated. The
groundwater velocity was calculated as 0.044 feet/day. Vertical hydraulic gradient between GW09 and
GW02 was calculated to be downward at 0.186 ft/ft and the horizontal hydraulic gradient between GW05
and GW11 was determined to be 0.007 ft/ft based on the groundwater elevation data obtained on December
2, 2019. Groundwater flow direction has been historically documented flow to the west and northwest.
During the July 2022 sampling event, groundwater flow direction was to the southwest.

5.2 GROUNDWATER LEVELS

On October 17, 2022, groundwater levels were measured in four (4) existing monitoring wells (GW07, GW08,
GW09, and GW13) during the quarterly sampling event. An oil/water interface probe was used to measure the
depths to water and light non-aqueous phase liquid (LNAPL), if present. Depths were measured from the top
of the well casings, which are referenced to an arbitrary benchmark of 100 feet. The ORS socks in GW13 were
removed prior to sampling and were reinstalled following sampling. Monitoring well construction details and
groundwater elevation data are included in Table 2. According to the groundwater elevation contour map
Circle K Store #7930 (RM #2681)
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ATC Project No. P662681991 Phillips 66 Company
constructed from the October 2022 data, the inferred on-site groundwater flows west-southwest from the site.
The groundwater elevation contour map is included as Figure 4.

5.3 GROUNDWATER QUALITY

On October 17, 2022, groundwater samples were collected from four (4) existing monitoring wells (GW07,
GW08, GW09, and GW13). Groundwater samples were collected into laboratory-approved containers,
packed in ice and delivered under chain-of-custody to SGS North America Inc. in Lafayette, Louisiana, for
analysis. The groundwater samples were analyzed for volatile organic compounds including benzene,
toluene, ethylbenzene, and total xylenes (BTEX), isopropyl ether (IPE), ethylene dibromide (EDB), and
MTBE via EPA Method 6200B.

Current groundwater analytical results are summarized in Table 3 and historical groundwater analytical
results are shown in Table 4. Based on the October 2022 analytical results, VOCs were not detected in on-
site monitoring wells. Furthermore, detected VOCs in GW09 have remained below the respective 2L
Standards since the remediation system was shut down in December 2021. Finally, MTBE was detected
above the 2L Standard in the sample collected from off-site monitoring well GW13 (240 micrograms per
liter [µg/L]).

A dissolved MTBE in groundwater map is included as Figure 5. Concentrations versus time graphs are
included as Figure 6. The laboratory analytical results for the October 2022 sampling event are included in
Appendix B.

Benzene Mass Removal
In 2014, the dissolved benzene contaminant mass at the site was estimated to cover an area approximately
3,600 ft2 resulting in a calculated dissolved benzene baseline mass of 1.1 kg. Based on the most recent
groundwater analytical data (October 2022), the dissolved benzene concentrations in GW13 have been
reduced below laboratory detection limits. The dissolved contaminant mass at the site was estimated to cover
an area approximately 0 ft2 resulting in a calculated dissolved benzene mass of 0.0 kg. Therefore, the dissolved
benzene mass has been reduced at the site by approximately 100%. The contaminant mass calculations are
provided in Table 5 and contaminant mass removal is provided in Table 6.

MTBE Mass Removal
In 2014, the dissolved contaminant mass at the site was estimated to cover an area approximately 14,175 ft2
resulting in a calculated dissolved MTBE baseline mass of 147.9 kg. Based on the most recent groundwater
analytical data from October 2022, the dissolved MTBE concentration exceeded the 2L Standard in GW13.
The dissolved contaminant mass at the site was estimated to cover an area approximately 2,000 ft2 resulting
Circle K Store #7930 (RM #2681)
January 13, 2023
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ATC Project No. P662681991 Phillips 66 Company
in a calculated dissolved MTBE mass of 0.166 kg. Therefore, the dissolved MTBE mass has been reduced at
the site by approximately 99.89%. The contaminant mass calculations are provided in Table 5 and contaminant
mass removal is provided in Table 7. Contaminant mass versus time is provided in Appendix C.

6.0 GROUNDWATER TREATMENT SYSTEM

6.1 SYSTEM DESCRIPTION

The groundwater treatment system consists of a 15 horsepower (hp) three phase Rotron Regenerative
Blower connected to six soil vapor extraction wells (MP-1, MP-2, VW01 through VW04) and a 10 Hp
Rietschle air sparge blower connected to three air sparge wells (AS01 through AS03). On October 30,
2014, ATC supervised the start-up of the remediation system. The soil vapor extraction and air sparge
system layout is included in Figure 7.

6.2 SYSTEM STATUS

For the period from July 2021 through November 2021, the air sparge system and soil vapor extraction
system experienced a runtime of approximately 100% (not including downtime for scheduled maintenance).
Based on the reduction of groundwater concentrations below the respective 2L Standards in on-site
monitoring wells, the remediation system was shut down on December 2, 2021.

7.0 FATE AND TRANSPORT MODEL

ATC completed a fate and transport model using the NCDEQ Risk Calculator (version date July 2022) to
assess risks to groundwater receptors. The groundwater point-of-exposure (POE) designated in the model
is the nearest downgradient potable water supply well, PW-4217, located approximately 786 feet from the
source area at the site. Potable wells PW-4204, PW-4206, PW-4208, and PW-4210 are located closer to the
site; however, these wells are located upgradient of the source area and have not indicated compounds above
laboratory reporting limits during historical sampling activities. Concentrations of toluene and total xylenes have
been detected in PW-4217 in February 2000 below the 2L Standard. Laboratory analytical results did not
identify any compound above the laboratory reporting limit in well PW-4217 in subsequent sampling events.
Historical water supply well data is included as Table 8.

ATC reviewed historical soil and groundwater analytical data to determine the source areas. Based on a review
of soil samples collected between July 1996 and September 1997, there are no soil impacts above regulatory
standard present at the site. Historical soil analytical data is included as Table 9.

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ATC Project No. P662681991 Phillips 66 Company
To determine the groundwater source area, ATC reviewed groundwater data collected after the remediation
system shut down in December 2021. Four quarterly sampling events have been performed since
December 2021 (January 2022, April 2022, July 2022, and October 2022). Based on the data, wells GW08
and GW13 have exhibited concentrations of MTBE above the 2L Standards since December 2021. No
other compound has been detected above 2L Standard. GSI Mann-Kendall Toolkits were utilized to
determine MTBE concentrations trends for both wells. Well GW08 indicates no discernable trend for MTBE;
however, MTBE has not been detected above 2L Standards in the well since January 2022. Well GW13
indicated a stable trend for MTBE. GSI Mann-Kendall toolkits are included as Appendix D. Based on a
review of the historical data, it was determined monitoring well GW13 has consistently exhibited the highest
groundwater concentrations since remediation system shut down. Therefore, this was designated as the
groundwater source area. ATC utilized the highest concentration for each compound detected in the monitoring
well for the past four sampling events. Groundwater exposure point concentrations are included as Table 10.
The groundwater source area is shown on Figure 8.

Modeling results for the protection of groundwater use indicated no exceedances of Site-Specific Target
Levels in groundwater. The NCDEQ Risk Calculator is included as Appendix E. Since the NCDEQ Risk
Calculator does not take into account biodegradation and no exceedances were identified, ATC did not
model the results with the RBCA Toolkit for Chemical Releases (which utilizes biodegradation). The RBCA
Toolkit would be utilized only if the exceedances were identified in the NCDEQ Risk Calculator.

8.0 MONITORING PLAN AND SCHEDULE

Based on the results of the fate and transport model and concentration trends for the site, ATC recommends
concluding monitoring activities and initiating site closure.

9.0 SUMMARY

During this reporting period, ATC conducted a quarterly sampling event at the site in October 2022. The
collected data indicated the following:

 Groundwater flows west-southwest from the site;
 VOCs were not detected in on-site monitoring wells. Furthermore, detected VOCs in GW09 have
remained below the respective 2L Standards since the remediation system was shut down in December
2021;
 MTBE was detected above the 2L Standard in the sample collected from GW13;
 Based on the mass removal calculations, benzene has been reduced by approximately 100% and MTBE
has been reduced by approximately 99.89%;
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ATC Project No. P662681991 Phillips 66 Company
 The MTBE impacts in well GW13 appear stable since remediation system shut down; and
 According to the NCDEQ Risk Calculator, groundwater impacts at the site will not result in 2L Standard
exceedances in the nearest downgradient potable water supply well.
Based on field observations and laboratory analytical results, groundwater concentration trends, and fate and
transport modeling, ATC recommends site closure.

Circle K Store #7930 (RM #2681)
November 17, 2022

ATC Project No. P662681991 Phillips 66 Company
TABLES
TABLE 1
WATER SUPPLY WELL PROPERTY OWNER TABLE
CIRCLE K STORE NO. 7930 (RM NO. 2681)
3700 GROOMETOWN ROAD
GREENSBORO, NORTH CAROLINA
ATC PROJECT NO. P662681390
Well ID Property Address Property Owner and Address
Connected to
Public Water
Supply?
Use of Water
Supply Well?
PW-3508 3508 Groometown Road
Gina and Mark Gibson
3508 Groometown Road
Greensboro, NC 27407
Yes Unknown
PW-3510 3510 Groometown Road
Hilltop Holdings II LLC
4716 Hilltop Road
Greensboro, NC 27407
Yes Unknown
PW-3602 3602 Groometown Road
Rebecca and David York
1107 Gretchen Lane
Greensboro, NC 27410
Yes Unknown
PW-3606 3606 Groometown Road
Hilltop Holdings II LLC
4716 Hilltop Road
Greensboro, NC 27407
Yes Unknown
PW-4204 4204 Wayne Road
Mahi Properties Inc.
Mohammad Butt
4306 Cabarrus Court West
Oxford, NC 27565
No Drinking
PW-4206 4206 Wayne Road
Mahi Properties Inc.
Mohammad Butt
4306 Cabarrus Court West
Greensboro, NC 27407
No Drinking
PW-4208 4208 Wayne Road
Susan J. Rodgers
4208 Wayne Road
Greensboro, NC 27407
No Drinking
PW-4210 4210 Wayne Road
Barbara H. Thomas
328 Centre Drive
Randleman, NC 27317
No Drinking
PW-4217 4217 Wayne Road
Gail and Carl Wills
4217 Wayne Road
Greensboro, NC 27407
No Drinking
PW-3709 3709 Groometown Road
Celia Phelps Memorial United Methodist
Church
3709 Groometown Road
Greensboro, NC 27407
Yes Unknown
PW-4008 4008 Sedgegrove Road
Willis Y. Mlo
4008 Sedgegrove Road
Greensboro, NC 27407
No Presumed
Drinking
1. Property ownership and municipal water connections confirmed July 24, 2019.
Page 1 of 1
TABLE 2
WELL CONSTRUCTION DETAILS AND HISTORICAL WATER LEVEL ELEVATIONS
CIRCLE K STORE NO. 7930 (RM NO. 2681)
3700 GROOMETOWN ROAD
GREENSBORO, NORTH CAROLINA
ATC PROJECT NO. P662681390
Well Screen Total Well Screen TOC Depth to Groundwater
Diameter Slot Size Depth Interval Elevation Water Elevation
(inches)(inches)(feet bgs)(feet bgs)(feet)(feet)(feet)
5/9/2007 24.12 73.30
11/28/2007 27.70 69.72
6/24/2008 26.71 70.71
8/25/2009 24.38 73.04
1/25/2011 25.76 71.66
10/27/2011 30.27 67.15
7/12/2012 29.42 68.00
3/19/2013 34.04 63.38
5/28/2014 24.64 72.78
11/21/2014 30.75 66.67
3/3/2015
6/17/2015 31.30 66.12
12/16/2015 29.20 68.22
6/6/2016 26.70 70.72
12/14/2016 30.76 66.66
6/6/2017 32.63 64.79
12/13/2017 30.08 67.34
6/20/2018 28.26 69.16
12/6/2018 28.78 68.64
6/11/2019 28.77 68.65
12/2/2019 28.78 68.64
3/26/2020
6/30/2020 27.20 70.22
12/22/2020 25.54 71.88
6/10/2021 23.71 73.71
1/14/2022 27.98 69.44
7/20/2022 30.37 67.05
5/9/2007 22.48 73.36
11/28/2007 26.00 69.84
6/24/2008 24.97 70.87
8/25/2009 22.87 72.97
1/25/2011 24.74 71.10
10/27/2011 25.81 70.03
7/12/2012 24.70 71.14
3/19/2013 24.59 71.25
5/28/2014 22.26 73.58
11/21/2014 24.47 71.37
3/3/2015 24.92 70.92
6/17/2015 23.24 72.60
9/24/2015 25.60 70.24
12/16/2015 22.70 73.14
4/21/2016 21.32 74.52
6/6/2016 22.77 73.07
12/14/2016 25.28 70.56
6/6/2017 23.35 72.49
12/13/2017 29.02 66.82
6/20/2018 24.79 71.05
12/6/2018 23.91 71.93
6/11/2019 21.00 74.84
12/2/2019 22.82 73.02
3/26/2020
6/30/2020 19.40 76.44
12/22/2020 20.68 75.16
6/10/2021 20.60 75.24
1/14/2022 23.97 71.87
7/20/2022 23.08 72.76
5/9/2007 21.10 73.82
11/28/2007 NM NM
6/24/2008 23.71 71.21
8/25/2009 26.82 68.10
1/25/2011 23.49 71.43
10/27/2011 24.57 70.35
7/12/2012
3/19/2013 23.22 71.70
5/28/2014 20.87 74.05
11/21/2014 24.48 70.44
3/3/2015
6/17/2015 22.88 72.04
12/16/2015 22.64 72.28
6/6/2016 22.11 72.81
12/14/2016 24.40 70.52
6/6/2017 23.06 71.86
12/13/2017 25.30 69.62
6/20/2018 23.40 71.52
12/6/2018 22.65 72.27
6/11/2019 20.15 74.77
12/2/2019 22.05 72.87
3/26/2020
6/30/2020 19.55 75.37
12/22/2020 19.97 74.95
6/10/2021 19.40 75.52
1/14/2022 21.96 72.96
7/20/2022 22.10 72.82
Notes:
1. GW01 abandoned in Aug 1998 and replaced with GW09.
2. GW03 and GW04 abandoned in June 2006.
3. TOC = Top of casing.
4. Elevations referenced to arbitrary site benchmark of 100.00 feet.
5. bgs = Below ground surface.
6. * Vertical extent well; outer casing constructed of 6-inch PVC.
7. NM = Not measured.
Date
Measured
Not Measured/Not Located
Not Measured
Not Measured
Not Measured
Not Measured
Not Measured
Monitoring
Well
Date of
Construction
04/16/97 2 95.84
GW02*04/15/97 2 0.01 60 55-60 97.42
35 15-35
0.01 30 15-30GW05
94.92GW0608/11/97 2 0.01
Page 1 of 5
TABLE 2
WELL CONSTRUCTION DETAILS AND HISTORICAL WATER LEVEL ELEVATIONS
CIRCLE K STORE NO. 7930 (RM NO. 2681)
3700 GROOMETOWN ROAD
GREENSBORO, NORTH CAROLINA
ATC PROJECT NO. P662681390
Well Screen Total Well Screen TOC Depth to Groundwater
Diameter Slot Size Depth Interval Elevation Water Elevation
(inches)(inches)(feet bgs)(feet bgs)(feet)(feet)(feet)
Date
Measured
Monitoring
Well
Date of
Construction
5/9/2007 21.79 73.19
11/28/2007 25.40 69.58
6/24/2008 24.37 70.61
8/25/2009 22.24 72.74
1/25/2011 24.17 70.81
10/27/2011 25.22 69.76
7/12/2012 24.10 70.88
3/19/2013 23.98 71.00
5/28/2014 21.68 73.30
11/21/2014 25.26 69.72
3/3/2015 24.34 70.64
6/17/2015 23.80 71.18
9/24/2015 24.92 70.06
12/16/2015 23.44 71.54
4/21/2016 22.10 72.88
6/6/2016 21.84 73.14
12/14/2016 24.95 70.03
3/21/2017 25.12 69.86
6/6/2017 23.76 71.22
9/20/2017 24.71 70.27
12/13/2017 25.97 69.01
3/20/2018 24.93 70.05
6/20/2018 24.19 70.79
9/21/2018 24.69 70.29
12/6/2018 23.48 71.50
3/12/2019 21.38 73.60
6/11/2019 20.88 74.10
9/9/2019 21.67 73.31
12/2/2019 24.18 70.80
3/26/2020 20.80 74.18
6/30/2020 20.29 74.69
9/29/2020 21.07 73.91
12/22/2020 20.73 74.25
6/10/2021 20.29 74.69
9/27/2021 22.18 72.80
1/14/2022 23.70 71.28
4/21/2022 22.10 72.88
7/20/2022 22.82 72.16
10/17/2022 23.74 71.24
5/9/2007 20.05 72.94
11/28/2007 23.60 69.39
6/24/2008 22.53 70.46
8/25/2009 20.37 72.62
1/25/2011 22.35 70.64
10/27/2011 23.48 69.51
7/12/2012 22.30 70.69
3/19/2013 22.12 70.87
5/28/2014 19.93 73.06
11/21/2014 23.40 69.59
3/3/2015
6/17/2015 21.88 71.11
12/16/2015 21.58 71.41
6/6/2016 20.11 72.88
12/14/2016 23.27 69.72
3/21/2017 23.24 69.75
6/6/2017 22.00 70.99
9/20/2017 22.93 70.06
12/13/2017 24.11 68.88
3/20/2018 23.11 69.88
6/20/2018 24.30 68.69
9/21/2018 22.76 70.23
12/6/2018 21.56 71.43
3/12/2019 19.42 73.57
6/11/2019 19.18 73.81
9/9/2019 19.92 73.07
12/2/2019 21.05 71.94
3/26/2020 19.14 73.85
6/30/2020 18.57 74.42
9/29/2020 19.34 73.65
12/22/2020 19.01 73.98
6/10/2021 18.54 74.45
9/27/2021 20.44 72.55
1/14/2022 21.90 71.09
4/21/2022 20.32 72.67
7/20/2022 20.03 72.96
10/17/2022 21.97 71.02
Notes:
1. GW01 abandoned in Aug 1998 and replaced with GW09.
2. GW03 and GW04 abandoned in June 2006.
3. TOC = Top of casing.
4. Elevations referenced to arbitrary site benchmark of 100.00 feet.
5. bgs = Below ground surface.
6. * Vertical extent well; outer casing constructed of 6-inch PVC.
7. NM = Not measured.
Not Measured
92.9920.01 35 15-35GW0809/22/97
94.98GW0708/11/97 2 0.01 35 15-35
Page 2 of 5
TABLE 2
WELL CONSTRUCTION DETAILS AND HISTORICAL WATER LEVEL ELEVATIONS
CIRCLE K STORE NO. 7930 (RM NO. 2681)
3700 GROOMETOWN ROAD
GREENSBORO, NORTH CAROLINA
ATC PROJECT NO. P662681390
Well Screen Total Well Screen TOC Depth to Groundwater
Diameter Slot Size Depth Interval Elevation Water Elevation
(inches)(inches)(feet bgs)(feet bgs)(feet)(feet)(feet)
Date
Measured
Monitoring
Well
Date of
Construction
5/9/2007 23.84 73.33
11/28/2007 27.25 69.92
6/24/2008 26.29 70.88
8/25/2009 24.03 73.14
1/25/2011 25.96 71.21
10/27/2011 27.10 70.07
7/12/2012 26.04 71.13
3/19/2013 26.00 71.17
5/28/2014 23.67 73.50
11/21/2014 27.88 69.29
3/3/2015 25.72 71.45
6/17/2015 24.87 72.30
9/24/2015 25.74 71.43
12/16/2015 24.71 72.46
4/21/2016 23.33 73.84
6/6/2016 23.27 73.90
12/14/2016 26.42 70.75
3/21/2017 26.03 71.14
6/6/2017 24.45 72.72
9/20/2017 25.51 71.66
12/13/2017 26.80 70.37
3/20/2018 25.92 71.25
6/20/2018 24.19 72.98
9/21/2018 25.58 71.59
12/6/2018 24.52 72.65
3/12/2019 22.60 74.57
6/11/2019 22.00 75.17
9/9/2019 23.48 73.69
12/2/2019 23.75 73.42
3/26/2020 21.80 75.37
6/30/2020 21.42 75.75
9/29/2020 22.20 74.97
12/22/2020 21.78 75.39
6/10/2021 21.54 75.63
9/27/2021 22.85 74.32
1/14/2022 25.39 71.78
4/21/2022 23.98 73.19
7/20/2022 24.67 72.50
10/17/2022 25.39 71.78
5/9/2007 NM NM
11/28/2007 24.40 69.32
6/24/2008 23.15 70.57
8/25/2009 21.12 72.60
1/25/2011 23.22 70.50
10/27/2011 24.22 69.50
7/12/2012 22.73 70.99
3/19/2013 22.68 71.04
5/28/2014 NM NM
11/21/2014 24.04 69.68
3/3/2015
6/17/2015 22.57 71.15
12/16/2015 22.18 71.54
6/6/2016 20.70 73.02
12/14/2016 23.95 69.77
6/6/2017 22.60 71.12
12/13/2017 24.80 68.92
6/20/2018 23.08 70.64
12/6/2018 22.30 71.42
6/11/2019 19.90 73.82
12/2/2019 21.83 71.89
3/26/2020
6/30/2020 19.07 74.65
12/22/2020 19.77 73.95
6/10/2021 19.14 74.58
1/14/2022 22.74 70.98
7/20/2022 21.74 71.98
Notes:
1. GW01 abandoned in Aug 1998 and replaced with GW09.
2. GW03 and GW04 abandoned in June 2006.
3. TOC = Top of casing.
4. Elevations referenced to arbitrary site benchmark of 100.00 feet.
5. bgs = Below ground surface.
6. * Vertical extent well; outer casing constructed of 6-inch PVC.
7. NM = Not measured.
Not Measured
Not Measured
GW09 08/18/98 2 0.01 30 15-30 97.17
93.72GW1004/05/00 1 0.01 30 15-30
Page 3 of 5
TABLE 2
WELL CONSTRUCTION DETAILS AND HISTORICAL WATER LEVEL ELEVATIONS
CIRCLE K STORE NO. 7930 (RM NO. 2681)
3700 GROOMETOWN ROAD
GREENSBORO, NORTH CAROLINA
ATC PROJECT NO. P662681390
Well Screen Total Well Screen TOC Depth to Groundwater
Diameter Slot Size Depth Interval Elevation Water Elevation
(inches)(inches)(feet bgs)(feet bgs)(feet)(feet)(feet)
Date
Measured
Monitoring
Well
Date of
Construction
5/9/2007 19.66 73.03
11/28/2007 23.37 69.32
6/24/2008 22.32 70.37
8/25/2009 20.28 72.41
1/25/2011 22.14 70.55
10/27/2011 22.97 69.72
7/12/2012 21.73 70.96
3/19/2013 21.80 70.89
5/28/2014 NM NM
11/21/2014 23.02 69.67
3/3/2015
6/17/2015 22.73 69.96
12/16/2015 21.40 71.29
6/6/2016 19.80 72.89
12/14/2016 23.12 69.57
6/6/2017 21.78 70.91
12/13/2017 23.94 68.75
6/20/2018 22.13 70.56
12/6/2018 21.34 71.35
6/11/2019 18.93 73.76
12/2/2019 20.72 71.97
3/26/2020
6/30/2020 18.12 74.57
12/22/2020 18.56 74.13
6/10/2021 18.12 74.57
1/14/2022 21.72 70.97
7/20/2022 20.81 71.88
5/9/2007 19.14 72.63
11/28/2007 22.69 69.08
6/24/2008 21.57 70.20
8/25/2009 19.48 72.29
1/25/2011 21.46 70.31
10/27/2011 22.62 69.15
7/12/2012 21.27 70.50
3/19/2013 21.31 70.46
5/28/2014 NM NM
11/21/2014 22.50 69.27
3/3/2015
6/17/2015
12/16/2015 20.77 71.00
6/6/2016 19.35 72.42
12/14/2016 22.45 69.32
6/6/2017 21.18 70.59
12/13/2017 23.28 68.49
6/20/2018 21.40 70.37
12/6/2018 20.60 71.17
6/11/2019 18.30 73.47
12/2/2019 20.17 71.60
3/26/2020
6/30/2020 17.74 74.03
12/22/2020 18.15 73.62
6/10/2021 17.78 73.99
1/14/2022 20.94 70.83
7/20/2022 20.15 71.62
Notes:
1. GW01 abandoned in Aug 1998 and replaced with GW09.
2. GW03 and GW04 abandoned in June 2006.
3. TOC = Top of casing.
4. Elevations referenced to arbitrary site benchmark of 100.00 feet.
5. bgs = Below ground surface.
6. * Vertical extent well; outer casing constructed of 6-inch PVC.
7. NM = Not measured.
Not Measured
Not Measured
Not Measured
Not Measured
Not Measured
GW11 04/05/00 1 0.01
GW12 04/05/00 1 0.01 30 15-30 91.77
92.693015-30
Page 4 of 5
TABLE 2
WELL CONSTRUCTION DETAILS AND HISTORICAL WATER LEVEL ELEVATIONS
CIRCLE K STORE NO. 7930 (RM NO. 2681)
3700 GROOMETOWN ROAD
GREENSBORO, NORTH CAROLINA
ATC PROJECT NO. P662681390
Well Screen Total Well Screen TOC Depth to Groundwater
Diameter Slot Size Depth Interval Elevation Water Elevation
(inches)(inches)(feet bgs)(feet bgs)(feet)(feet)(feet)
Date
Measured
Monitoring
Well
Date of
Construction
5/9/2007 23.34 73.10
11/28/2007 26.87 69.57
6/24/2008 25.83 70.61
8/25/2009 23.68 72.76
1/25/2011 25.64 70.80
10/27/2011 26.75 69.69
7/12/2012 25.61 70.83
3/19/2013 25.48 70.96
5/28/2014 23.17 73.27
11/21/2014 26.60 69.84
3/3/2015 28.64 67.80
6/17/2015 28.30 68.14
9/24/2015 26.27 70.17
12/16/2015 24.78 71.66
4/21/2016 23.53 72.91
6/6/2016 23.32 73.12
12/14/2016 26.38 70.06
3/21/2017 26.61 69.83
6/6/2017 25.20 71.24
9/20/2017 26.22 70.22
12/13/2017 27.34 69.10
3/20/2018 26.35 70.09
6/20/2018 25.63 70.81
9/21/2018 26.14 70.30
12/6/2018 24.96 71.48
3/12/2019 22.83 73.61
6/11/2019 22.32 74.12
9/9/2019 23.19 73.25
12/2/2019 22.83 73.61
3/26/2020 22.29 74.15
6/30/2020 20.8 75.64
9/29/2020 22.54 73.90
12/22/2020 22.16 74.28
6/10/2021 21.81 74.63
9/27/2021 23.69 72.75
1/14/2022 25.69 70.75
4/21/2022 23.93 72.51
7/20/2022 24.89 71.55
10/17/2022 25.27 71.17
AS01 09/13/99 2 0.01 40 35-40 NM NM NM NM
AS02 09/19/14 2 0.01 40 35-40 NM NM NM NM
AS03 09/17/14 2 0.01 40 35-40 NM NM NM NM
VW01 09/13/99 4 0.01 22 5-22 NM NM NM NM
VW02 09/19/14 4 0.01 20 5-20 NM NM NM NM
VW03 09/17/14 4 0.01 20 5-20 NM NM NM NM
VW04 09/17/14 4 0.01 20 5-20 NM NM NM NM
MP-1 09/13/99 2 0.01 35 5-35 NM NM NM NM
MP-2 09/13/99 2 0.01 35 5-35 NM NM NM NM
Notes:
1. GW01 abandoned in Aug 1998 and replaced with GW09.
2. GW03 and GW04 abandoned in June 2006.
3. TOC = Top of casing.
4. Elevations referenced to arbitrary site benchmark of 100.00 feet.
5. bgs = Below ground surface.
6. * Vertical extent well; outer casing constructed of 6-inch PVC.
7. NM = Not measured.
GW13 01/29/02 2 0.01 35 15-35 96.44
Page 5 of 5
TABLE 3
GROUNDWATER ANALYTICAL DATA
CIRCLE K STORE NO. 7930 (RM NO. 2681)
3700 GROOMETOWN ROAD
GREENSBORO, NORTH CAROLINA
ATC PROJECT NO. P662681390
Monitoring
Well
Date
Sampled
Benzene Toluene Ethylbenzene Xylene (total) BTEX Methyl Tert Butyl Ether Naphthalene Di-Isopropyl Ether Methyl Chloride 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene AcetoneGW07 10/17/2022 <0.50 <0.50 <0.50 <0.50 <0.50 3.4 <0.50 <0.50 <0.50 <0.50 <0.50 <10
GW08 10/17/2022 <0.50 <0.50 <0.50 <0.50 <0.50 0.93 <0.50 <0.50 <0.50 <0.50 <0.50 <10
GW09 10/17/2022 0.33 J 0.71 <0.50 0.42 J 1.46 <0.50 0.29 J <0.50 2.5 0.45 J 0.20 J 3.5 J
GW13 10/17/2022 <2.5 <2.5 <2.5 <2.5 <2.5 240 <2.5 2.1 J <2.5 <2.5 <2.5 14.4 J
1 600 600 500 NE 20 6 70 3 400 400 6,000
5,000 260,000 80,000 50,000 NE 20,000 6,000 70,000 3,000 28,500 24,100 6,000,000
Notes:
1. MTBE = Methyl Tertiary Butyl Ether.
2. BTEX = Benzene, Toluene, Ethylbenzene, and Xylenes.
3. "<" or ND = Not Detected at or above the laboratory reporting limit.
4. Concentrations are reported in micrograms per liter (ug/l) = parts per billion (ppb).
5. Concentrations in BOLD equal or exceed the corresponding NCDEQ Groundwater Quality 2L Standard (2L Standard).
6. GCL = Gross Contamination Limit.
7. NE = Not Established.
8. J = Indicates constituent was detected above laboratory detection limit but below laboratory reporting limit.
GCLs
2L Standard
Analytical Method EPA 6200B
Page 1 of 1
TABLE 4
HISTORICAL GROUNDWATER ANALYTICAL DATA
CIRCLE K STORE NO. 7930 (RM NO. 2681)
3700 GROOMETOWN ROAD
GREENSBORO, NORTH CAROLINA
ATC PROJECT NO. P662681390
Monitoring Ethyl-Total Total
Well benzene Xylenes BTEX
04/23/97 8,700 28,100 2,900 17,200 56,900 1,600 NA NA NA
07/07/98 NS NS NS NS NS NS NS NS NS
05/05/99
07/07/98 <1 <1 <1 <1 ND <1 <10 NA <1
05/05/99 <0.5 <1 <1 <1 ND <5 <5 NA <1
08/31/99 <1 <1 <1 <1 ND <1 <1 NA <1
11/30/99 <0.5 <1 <1 <1 ND <5 <5 NA <1
02/29/00 7.5 17 <1 <1 24.5 <5 <5 NA <1
05/31/00 <0.5 <1 <1 <1 ND <5 <5 NA <1
09/12/00 <0.6 <1 <1 <1 ND <5 <5 NA <1
12/14/00 <0.7 <1 <1 <1 ND <5 <5 NA <1
03/22/01 <0.8 <1 <1 <1 ND <5 <5 NA <1
06/28/01 <0.9 <1 <1 <1 ND <5 <5 NA <1
09/27/01 <0.10 <1 <1 <1 ND <5 <5 NA <1
01/30/02 <0.11 <1 <1 <1 ND <5 <5 NA <1
06/26/02 <0.12 <1 <1 <1 ND <5 <5 NA <1
09/06/02 NS NS NS NS NS NS NS NS NS
03/28/03 NS NS NS NS NS NS NS NS NS
09/23/03 <0.5 <5 <1 <1 ND <5 <5 NA <1
04/01/04 NS NS NS NS NS NS NS NS NS
10/01/04 NS NS NS NS NS NS NS NS NS
05/12/05 NS NS NS NS NS NS NS NS NS
04/04/06 NS NS NS NS NS NS NS NS NS
11/01/06 13 23 2 18 56 2 <0.8 NA <1
05/09/07 3 20 3 18 44 2 <0.8 <1 <1
11/28/07 <1 <5 <5 <10 ND 3.3J <5 <5 <0.02
06/24/08 <0.1 <0.1 <0.1 <0.2 ND 3.4 <0.1 0.38 <0.02
08/25/09 <0.1 <0.2 <0.1 <0.1 ND <0.2 <0.1 <0.1 <0.1
01/25/11 <0.1 <0.1 <0.1 <0.3 ND 0.94 0.13 <0.1 <0.1
10/27/11 <0.5 <0.5 <0.5 <0.5 ND 0.6 <0.5 <0.5 <0.5
07/12/12 0.2J <0.5 <0.5 <0.5 0.2 5.6 0.5J <0.5 <0.5
03/19/13 <0.5 <0.5 <0.5 <0.5 ND 1.1 <0.5 0.2J <0.5
05/28/14 <0.5 <0.5 <0.5 <0.5 ND 0.2J <0.5 <0.5 <0.5
11/21/14 <0.1 <0.1 <0.1 <0.1 ND 18 2.1 <0.1 <0.1
03/03/15 NS NS NS NS NS NS NS NS NS
06/17/15 <0.1 <0.1 <0.1 <0.2 <0.5 0.1J <0.1 <0.1 --
09/24/15 NS NS NS NS NS NS NS NS NS
12/16/15 <0.5 <0.5 <0.5 <0.5 <0.5 0.2J <0.5 <0.5 <0.5
04/21/16 NS NS NS NS NS NS NS NS NS
06/06/16 <0.1 <0.1 <0.1 <0.1 ND 0.2J <0.1 <0.1 <0.1
12/14/16 <0.3 <0.2 <0.2 <0.6 ND <0.2 <0.1 <0.5 <0.1
03/21/17 NS NS NS NS NS NS NS NS NS
06/06/17 <0.3 <0.2 <0.2 <0.6 ND 0.26 <0.1 <0.5 <0.1
09/20/17 NS NS NS NS NS NS NS NS NS
12/13/17 <0.3 <0.2 <0.2 <0.6 ND <0.2 <0.1 <0.5 <0.1
3/20/2018 NS NS NS NS NS NS NS NS NS
6/20/2018 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
9/21/2018 NS NS NS NS NS NS NS NS NS
12/6/2018 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
3/12/2019 NS NS NS NS NS NS NS NS NS
6/11/2019 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
12/2/2019 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
3/26/2020 NS NS NS NS NS NS NS NS NS
6/30/2020 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
12/22/2020 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
6/10/2021 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
1/14/2022 <0.50 <0.50 <0.50 <0.50 ND 0.18 J <0.50 <0.50 <0.50
7/20/2022 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 0.18 J <0.50
1 600 600 500 NE 20 70 6 0.02
5,000 260,000 80,000 50,000 NE 20,000 70,000 6,000 50
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. The 15A NCAC 02L .0202 Groundwater Quality Standards (2L Standards) were revised on January 21, 2021.
4. Concentrations in bold equal or exceed (2L Standard) in effect at the time of sampling.
5. GCL = Gross Contamination Level.
6. EDB = Ethylene dibromide (1,2-Dibromoethane).
7. BTEX = Benzene, Toluene, Ethylbenzene, and Total Xylenes.
8. MTBE = Methyl Tertiary Butyl Ether.
9. NS = Not sampled.
10. NA = Not analyzed.
11. J = Indicates constituent was detected above laboratory detection limit but below laboratory reporting limit.
GW01
GCL
2L Standard
GW02
NaphthaleneIsopropyl
etherMTBE EDBDate
Sampled
Well Abandoned
TolueneBenzene
Page 1 of 11
TABLE 4
HISTORICAL GROUNDWATER ANALYTICAL DATA
CIRCLE K STORE NO. 7930 (RM NO. 2681)
3700 GROOMETOWN ROAD
GREENSBORO, NORTH CAROLINA
ATC PROJECT NO. P662681390
Monitoring Ethyl-Total Total
Well benzene Xylenes BTEX
04/23/97 <1 <1 <1 <1 ND <5 <5 NA <0.02
07/07/98 <1 <1 <1 <1 ND <1 <10 NA <1
05/05/99 <0.5 <1 <1 <1 ND <5 <5 NA <1
08/31/99 <1 <1 <1 <1 ND <1 <1 NA <1
11/30/99 <0.5 <1 <1 4 4 <5 <5 NA <1
02/29/00 8.5 12 <1 <1 20.5 <5 <5 NA <1
05/31/00 <0.5 <1 <1 <1 ND <5 <5 NA <1
09/12/00 <0.5 <1 <1 <1 ND <5 <5 NA <1
12/14/00 <0.5 <1 <1 <1 ND <5 <5 NA <1
03/22/01 <0.5 <1 <1 <1 ND <5 <5 NA <1
06/28/01 <0.5 <1 <1 <1 ND <5 <5 NA <1
09/27/01 <0.5 <1 <1 <1 ND <5 <5 NA <1
01/30/02 <0.5 <1 <1 <1 ND <5 <5 NA <1
06/26/02 <0.5 <1 <1 <1 ND <5 <5 NA <1
09/06/02 NS NS NS NS NS NS NS NS NS
03/28/03 NS NS NS NS NS NS NS NS NS
09/23/03 <0.5 <5 <1 <1 ND <5 <5 NA <1
04/01/04 NS NS NS NS NS NS NS NS NS
10/01/04 NS NS NS NS NS NS NS NS NS
05/12/05 NS NS NS NS NS NS NS NS NS
04/04/06 NS NS NS NS NS NS NS NS NS
11/01/06
04/23/97 24 34 2 17 77 <5 <5 NA <0.02
07/07/98 29 13 2 16 60 <1 <10 NA <1
05/05/99 9 1 <1 <1 10 <5 <5 NA <1
08/31/99 13 2 5 8 28 <1 <1 NA <1
11/30/99 <0.5 <1 <1 <1 ND <5 <5 NA <1
02/29/00 <0.5 <1 <1 <1 ND <5 <5 NA <1
05/31/00 2.9 <1 <1 <1 2.9 <5 <5 NA <1
09/12/00 <0.5 <1 <1 <1 ND <5 <5 NA <1
12/14/00 2 <1 <1 <1 2 <5 <5 NA <1
03/22/01 <0.5 <1 <1 <1 ND <5 <5 NA <1
06/28/01 <0.5 <1 <1 <1 ND <5 <5 NA <1
09/27/01 <0.5 <1 <1 <1 ND <5 <5 NA <1
01/30/02 <0.5 <1 <1 <1 ND <5 <5 NA <1
06/26/02 <0.5 <1 <1 <1 ND <5 <5 NA <1
09/06/02 NS NS NS NS NS NS NS NS NS
03/28/03 NS NS NS NS NS NS NS NS NS
09/23/03 0.7 <1 <1 1 1.7 <5 <5 NA <1
04/01/04 NS NS NS NS NS NS NS NS NS
10/01/04 NS NS NS NS NS NS NS NS NS
05/12/05 NS NS NS NS NS NS NS NS NS
04/04/06 NS NS NS NS NS NS NS NS NS
11/01/06
1 600 600 500 NE 20 70 6 0.02
5,000 260,000 80,000 50,000 NE 20,000 70,000 6,000 50
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. The 15A NCAC 02L .0202 Groundwater Quality Standards (2L Standards) were revised on January 21, 2021.
4. Concentrations in bold equal or exceed (2L Standard) in effect at the time of sampling.
5. GCL = Gross Contamination Level.
6. EDB = Ethylene dibromide (1,2-Dibromoethane).
7. BTEX = Benzene, Toluene, Ethylbenzene, and Total Xylenes.
8. MTBE = Methyl Tertiary Butyl Ether.
9. NS = Not sampled.
10. NA = Not analyzed.
11. J = Indicates constituent was detected above laboratory detection limit but below laboratory reporting limit.
Date
Sampled
GW03
Well Abandoned
2L Standard
EDBTolueneBenzeneNaphthaleneMTBEIsopropyl
ether
GCL
Well Abandoned
GW04
Page 2 of 11
TABLE 4
HISTORICAL GROUNDWATER ANALYTICAL DATA
CIRCLE K STORE NO. 7930 (RM NO. 2681)
3700 GROOMETOWN ROAD
GREENSBORO, NORTH CAROLINA
ATC PROJECT NO. P662681390
Monitoring Ethyl-Total Total
Well benzene Xylenes BTEX
04/23/97 472 80 8 440 1,000 35 <25 NA <1
07/07/98 320 <1 <1 4 324 20 <10 NA <1
05/05/99 139 <2 <2 <2 139 46 <5 NA <1
08/31/99 35 3 <1 7 45 25 7 NA <1
11/30/99 7.2 <1 <1 <1 7.2 <5 <5 NA <1
02/29/00 15.5 <1 <1 <1 15.5 145 <5 NA <1
05/31/00 79.6 <1 <1 <1 79.6 <5 8 NA <1
09/12/00 74.3 <1 <1 <1 74.3 465 <5 NA <1
12/14/00 <0.5 <1 <1 <1 ND <5 <5 NA <1
03/22/01 10.4 <1 <1 <1 10.4 230 <5 NA <1
06/28/01 7.3 <1 <1 <1 7.3 203 7 NA <1
09/27/01 <0.5 <1 <1 <1 ND 71 <5 NA <1
01/30/02 6 <1 <1 <1 6 138 <5 NA <1
06/26/02 2 <1 <1 <1 2 89 <5 NA <1
09/06/02 2.3 <1 <1 <1 2.3 56 <5 NA <1
03/28/03 15 <1 <1 <1 15 1,220 51 NA <1
09/23/03 5.1 <5 <1 <1 5.1 2,300 84 NA <1
04/01/04 0.7 <0.7 <0.8 <0.8 0.7 1,300 56 NA <1
10/01/04 5.3 <1 <1 <1 5.3 430 22 NA <1
05/12/05 1.1 <1 <1 <1 1.1 870 50 NA <1
04/04/06 1.1 <5 <5 <5 1.1 190 <5 NA <1
11/01/06 0.8 <0.7 <0.8 <0.8 0.8 98 3 NA <1
05/09/07 0.9 3 <0.8 2.9 6.8 360 15 <1 <1
11/28/07 <1 <5 <5 <10 ND 79 2.6J <5 <0.02
06/24/08 <0.1 <0.1 <0.1 <0.2 ND 140 5.5 <0.1 <0.02
08/25/09 <0.1 <0.2 <0.1 <0.1 ND 720 25 <0.1 <0.1
01/25/11 <0.1 <0.1 <0.1 <0.3 ND 2,100 27 <0.1 <0.1
10/27/11 <0.5 <0.5 <0.5 <0.5 ND 890 18 <0.5 <0.5
07/12/12 <5 <5 <5 <5 ND 620 17 <5 <5
03/19/13 <5 <5 <5 <5 ND 480 11 <5 <5
05/28/14 <10 <10 <10 <10 ND 1,200 15 <10 <10
11/21/14 <1 <1 <1 <1 ND 300 2.9J <1 <1
03/03/15 <0.1 <0.1 <0.1 <0.2 <0.5 74 1.1 <0.1 --
06/17/15 <0.1 <0.1 <0.1 <0.2 <0.5 11 1.4 <0.1 --
09/24/15 <0.5 <0.5 <0.5 <0.5 <0.5 0.9 <0.5 <0.5 <0.5
12/16/15 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5
04/21/16 <0.1 <0.1 <0.1 <0.1 ND 0.3J <0.1 <0.1 <0.1
06/06/16 <0.1 <0.1 <0.1 <0.1 ND 0.7 <0.1 <0.1 <0.1
12/14/16 <0.3 <0.2 <0.2 <0.6 ND <0.2 <0.1 <0.5 <0.1
03/21/17 NS NS NS NS NS NS NS NS NS
06/06/17 <0.3 <0.2 <0.2 <0.6 ND <0.2 <0.1 <0.5 <0.1
09/20/17 NS NS NS NS NS NS NS NS NS
12/13/17 <0.3 <0.2 <0.2 <0.6 ND <0.2 <0.1 <0.5 <0.1
3/20/2018 NS NS NS NS NS NS NS NS NS
6/20/2018 <0.50 <0.50 <0.50 <0.50 ND 9.5 <0.50 <0.50 <0.50
9/21/2018 NS NS NS NS NS NS NS NS NS
12/6/2018 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
3/12/2019 NS NS NS NS NS NS NS NS NS
6/11/2019 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
12/2/2019 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
3/26/2020 NS NS NS NS NS NS NS NS NS
6/30/2020 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
12/22/2020 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
6/10/2021 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
1/14/2022 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
7/20/2022 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
1 600 600 500 NE 20 70 6 0.02
5,000 260,000 80,000 50,000 NE 20,000 70,000 6,000 50
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. The 15A NCAC 02L .0202 Groundwater Quality Standards (2L Standards) were revised on January 21, 2021.
4. Concentrations in bold equal or exceed (2L Standard) in effect at the time of sampling.
5. GCL = Gross Contamination Level.
6. EDB = Ethylene dibromide (1,2-Dibromoethane).
7. BTEX = Benzene, Toluene, Ethylbenzene, and Total Xylenes.
8. MTBE = Methyl Tertiary Butyl Ether.
9. NS = Not sampled.
10. NA = Not analyzed.
11. J = Indicates constituent was detected above laboratory detection limit but below laboratory reporting limit.
Date
Sampled
2L Standard
EDBIsopropyl
ether NaphthaleneBenzene
GW05
Toluene
GCL
MTBE
Page 3 of 11
TABLE 4
HISTORICAL GROUNDWATER ANALYTICAL DATA
CIRCLE K STORE NO. 7930 (RM NO. 2681)
3700 GROOMETOWN ROAD
GREENSBORO, NORTH CAROLINA
ATC PROJECT NO. P662681390
Monitoring Ethyl-Total Total
Well benzene Xylenes BTEX
04/23/97 <1 <1 <1 <1 ND <5 <5 NA <0.02
07/07/98 <1 <1 <1 <1 ND <1 <10 NA <1
05/05/99 <0.5 <1 <1 <1 ND <5 <5 NA <1
08/31/99 <0.5 <1 <1 1 1 <5 <5 NA <1
11/30/99 <0.5 <1 <1 <1 ND <5 <5 NA <1
02/29/00 6.3 23 <1 5 34.3 <5 <5 NA <1
05/31/00 <0.5 2 <1 <1 2 <5 <5 NA <1
09/12/00 <0.5 <1 <1 <1 ND <5 <5 NA <1
12/14/00 <0.5 <1 <1 <1 ND <5 <5 NA <1
03/22/01 <0.5 <1 <1 <1 ND <5 <5 NA <1
06/28/01 <0.5 <1 <1 <1 ND <5 <5 NA <1
09/27/01 <0.5 <1 <1 <1 ND <5 <5 NA <1
01/30/02 <0.5 <1 <1 <1 ND <5 <5 NA <1
06/26/02 <0.5 <1 <1 <1 ND <5 <5 NA <1
09/06/02 NS NS NS NS NS NS NS NS NS
03/28/03 NS NS NS NS NS NS NS NS NS
09/23/03 <0.5 <5 <1 <1 ND <5 <5 NA <1
04/01/04 NS NS NS NS NS NS NS NS NS
10/01/04 NS NS NS NS NS NS NS NS NS
05/12/05 NS NS NS NS NS NS NS NS NS
04/04/06 <1 <5 <5 <5 ND <5 <5 NA <1
11/01/06 <0.5 <0.7 <0.8 <0.8 ND <0.5 <0.8 NA <1
05/09/07 <0.5 1 <0.8 0.8 1.8 0.9 <0.8 NA <1
11/28/07 NS NS NS NS NS NS NS NS NS
06/24/08 <0.1 <0.1 <0.1 <0.2 ND <0.2 0.25 <0.1 <0.021
08/25/09 <0.1 <0.2 <0.1 <0.1 ND <0.2 <0.1 <0.1 <0.1
01/25/11 <0.1 <0.1 <0.1 <0.3 ND 0.39 0.27 <0.1 <0.1
10/27/11 <0.5 <0.5 <0.5 <0.5 ND 0.1J <0.5 <0.5 <0.5
07/12/12 NS NS NS NS NS NS NS NS NS
03/19/13 <0.5 <0.5 <0.5 <0.5 ND <0.5 <0.5 <0.5 <0.5
05/28/14 <0.5 <0.5 <0.5 <0.5 ND <0.5 <0.5 <0.5 <0.5
11/21/14 <0.1 <0.1 <0.1 <0.1 ND 0.1J <0.1 <0.1 <0.1
03/03/15
06/17/15 <0.1 <0.1 <0.1 <0.2 <0.5 <0.1 <0.1 <0.1 --
09/24/15
12/16/15 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5
04/21/16
06/06/16 <0.1 <0.1 <0.1 <0.1 ND <0.1 <0.1 <0.1 <0.1
12/14/16 <0.30 <0.2 <0.2 <0.6 ND <0.2 <0.1 <0.5 <0.1
03/21/17
6/6/2017 <0.3 <0.2 <0.2 <0.6 ND <0.2 <0.1 <0.5 <0.1
9/20/2017
12/13/2017 <0.3 <0.2 <0.2 <0.6 ND <0.2 <0.1 <0.5 <0.1
3/20/2018
6/20/2018 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
9/21/2018
12/6/2018 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
3/12/2019
6/11/2019 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
12/2/2019 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
3/26/2020
6/30/2020 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
12/22/2020 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
6/10/2021 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
1/14/2022 <0.50 <0.50 <0.50 <0.50 ND 0.15 J <0.50 <0.50 <0.50
7/20/2022 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
1 600 600 500 NE 20 70 6 0.02
5,000 260,000 80,000 50,000 NE 20,000 70,000 6,000 50
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. The 15A NCAC 02L .0202 Groundwater Quality Standards (2L Standards) were revised on January 21, 2021.
4. Concentrations in bold equal or exceed (2L Standard) in effect at the time of sampling.
5. GCL = Gross Contamination Level.
6. EDB = Ethylene dibromide (1,2-Dibromoethane).
7. BTEX = Benzene, Toluene, Ethylbenzene, and Total Xylenes.
8. MTBE = Methyl Tertiary Butyl Ether.
9. NS = Not sampled.
10. NA = Not analyzed.
11. J = Indicates constituent was detected above laboratory detection limit but below laboratory reporting limit.
GW06
Well Not Sampled
2L Standard
Well Not Sampled
EDB
Well Not Sampled
MTBE
GCL
Well Not Sampled
Benzene Toluene Naphthalene
Well Not Sampled
Well Not Sampled
Well Not Sampled
Isopropyl
ether
Well Not Sampled
Well Not Sampled
Date
Sampled
Page 4 of 11
TABLE 4
HISTORICAL GROUNDWATER ANALYTICAL DATA
CIRCLE K STORE NO. 7930 (RM NO. 2681)
3700 GROOMETOWN ROAD
GREENSBORO, NORTH CAROLINA
ATC PROJECT NO. P662681390
Monitoring Ethyl-Total Total
Well benzene Xylenes BTEX
04/23/97 1,480 <50 <50 <50 1,480 5,710 <5 NA <0.02
07/07/98 1,800 <50 <50 <50 1,800 21,000 <500 NA <50
05/05/99 389 <10 <10 <10 389 1,870 429 NA <10
08/31/99 218 <25 <25 <25 218 33,200 592 NA <25
11/30/99 <2,500 <2,500 <2,500 <2,500 ND 61,500 <2,500 NA <2,500
02/29/00 <25 <50 <50 <50 ND 40,000 <250 NA <50
05/31/00 54 <5 <5 <5 54 44,100 396 NA <5
09/12/00 29.4 <1 <1 <1 29.4 71,600 440 NA <1
12/14/00 <125 <250 <250 <250 ND 49,100 <1,250 NA <250
03/22/01 <25 <50 <50 <50 ND 51,200 <250 NA <50
06/28/01 <5 <10 <10 <10 ND 61,500 445 NA <10
09/27/01 9.4 <1 <1 <1 9.4 48,900 399 NA <1
01/30/02 <10 <20 <20 <20 ND 46,100 271 NA <20
06/26/02 <5 <10 <10 <10 ND 41,500 457 NA <10
09/06/02 <10 <20 <20 <20 ND 45,600 486 NA <20
03/28/03 <25 <50 <50 <50 ND 25,100 <250 NA <50
09/23/03 <25 <250 <50 <50 ND 18,600 <250 NA <50
04/01/04 <5 <7 <8 <8 ND 26,000 250 NA <10
10/01/04 300 <50 <50 <50 300 22,000 120 NA <1
05/12/05 <1 <1 <1 <1 ND 21,000 270 NA <1
04/04/06 <1 <5 <5 <5 ND 17,000 <5 NA <1
11/01/06 <10 <14 <16 <16 ND 22,000 160 NA <20
05/09/07 <10 <14 <16 <16 ND 21,000 120 <20 <20
11/28/07 <100 <500 <500 <1000 ND 24,000 120J <500 <0.02
06/24/08 <0.1 <0.1 <0.1 <0.2 ND 19,000 96 <0.1 <0.02
08/25/09 10 65 9.4 43 127.4 14,000 81 <5 <5
01/25/11 <0.1 <0.1 <0.1 <0.3 ND 14,000 72 <0.1 <0.1
10/27/11 <100 <100 <100 <100 ND 19,000 87J <100 <100
07/12/12 <100 <100 <100 <100 ND 14,000 62J <100 <100
03/19/13 <100 <100 <100 <100 ND 10,000 47J <100 <100
05/28/14 <25 <25 <25 <25 ND 7,100 23J 6J <25
11/21/14 <10 <10 <10 <10 ND 5,000 21J <10 <10
03/03/15 <1.0 <1.0 <1.0 <2.0 <5.0 1,400 5.9 <1.0 --
06/17/15 <5.0 <5.0 <5.0 <10.0 <25.0 2,300 9.4J <5.0 --
09/24/15 <0.5 <0.5 <0.5 <0.5 <0.5 2,100 7.2 <0.5 <0.5
12/16/15 <0.5 <0.5 <0.5 <0.5 <0.5 710 3.2J <0.5 <0.5
04/21/16 <0.5 <0.5 <0.5 <0.5 ND 160 0.9J <0.5 <0.5
06/06/16 <0.1 <0.1 <0.1 <0.1 ND 130 1.9 <0.1 <0.1
12/14/16 <3 <2 <2 <6 ND 647 2.1 <5 <1
03/21/17 <1.5 <1.0 <1.0 <6.0 ND 532 2.2 <2.5 <0.50
6/6/2017 <0.3 <0.2 <0.2 <0.6 ND 255 1.2 <0.5 <0.1
9/20/2017 <0.3 <0.2 <0.2 <0.6 ND 250 1.5 <0.5 <0.1
12/13/2017 <1.5 <1.0 <1.0 <3.0 ND 154 1.8 <2.5 <0.5
3/20/2018 <0.50 <0.50 <0.50 <0.50 ND 44.4 0.51 <0.50 <0.10
6/20/2018 <0.50 <0.50 <0.50 <0.50 ND 67.8 <0.50 <0.50 <0.50
9/21/2018 <0.50 <0.50 <0.50 <0.50 ND 95.4 0.52 <0.50 <0.50
12/6/2018 <0.50 <0.50 <0.50 <0.50 ND 17 <0.50 <0.50 <0.50
3/12/2019 <0.50 <0.50 <0.50 <0.50 ND 36.3 <0.50 <0.50 <0.50
6/11/2019 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
9/9/2019 <0.50 <0.50 <0.50 <0.50 ND 5.3 <0.50 <0.50 <0.50
12/2/2019 <0.50 <0.50 <0.50 <0.50 ND 322 3.0 0.63 <0.50
3/26/2020 <0.50 <0.50 <0.50 <0.50 ND 2.8 <0.50 <0.50 <0.50
6/30/2020 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
9/29/2020 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
12/22/2020 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
6/10/2021 <0.50 <0.50 <0.50 <0.50 ND 0.61 <0.50 <0.50 <0.50
9/27/2021 <0.50 <0.50 <0.50 <0.50 ND 1.4 <0.50 <0.50 <0.50
1/14/2022 <0.50 <0.50 <0.50 <0.50 ND 8.6 <0.50 <0.50 <0.50
4/21/2022 <0.50 <0.50 <0.50 <0.50 ND 2.6 <0.50 <0.50 <0.50
7/20/2022 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
10/17/2022 <0.50 <0.50 <0.50 <0.50 <0.50 3.4 <0.50 <0.50 <0.50
1 600 600 500 NE 20 70 6 0.02
5,000 260,000 80,000 50,000 NE 20,000 70,000 6,000 50
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. The 15A NCAC 02L .0202 Groundwater Quality Standards (2L Standards) were revised on January 21, 2021.
4. Concentrations in bold equal or exceed (2L Standard) in effect at the time of sampling.
5. GCL = Gross Contamination Level.
6. EDB = Ethylene dibromide (1,2-Dibromoethane).
7. BTEX = Benzene, Toluene, Ethylbenzene, and Total Xylenes.
8. MTBE = Methyl Tertiary Butyl Ether.
9. NS = Not sampled.
10. NA = Not analyzed.
11. J = Indicates constituent was detected above laboratory detection limit but below laboratory reporting limit.
GW07
GCL
Isopropyl
ether
2L Standard
Date
Sampled EDBNaphthaleneBenzeneTolueneMTBE
Page 5 of 11
TABLE 4
HISTORICAL GROUNDWATER ANALYTICAL DATA
CIRCLE K STORE NO. 7930 (RM NO. 2681)
3700 GROOMETOWN ROAD
GREENSBORO, NORTH CAROLINA
ATC PROJECT NO. P662681390
Monitoring Ethyl-Total Total
Well benzene Xylenes BTEX
09/30/97 <1 <1 <1 <1 ND <5 <5 NA <0.02
07/07/98 <1 <1 <1 <1 ND <1 <10 NA <1
05/05/99 13 22 <1 11 46 55 <5 NA <1
08/31/99 1 <1 <1 <1 1 37 1 NA <1
11/30/99 <0.5 <1 <1 3 3 <5 <5 NA <1
02/29/00 2.1 11 <1 1 14.1 268 <5 NA <1
05/31/00 1.1 <1 <1 <1 1.1 <5 <5 NA <1
09/12/00 <0.5 <1 <1 <1 ND <5 <5 NA <1
12/14/00 2.1 <1 <1 <1 2.1 8 <5 NA <1
03/22/01 <0.5 <1 <1 <1 ND 8 <5 NA <1
06/28/01 1.2 <1 <1 <1 1.2 7 <5 NA <1
09/27/01 <0.5 <1 <1 <1 ND <5 <5 NA <1
01/30/02 <0.5 <1 <1 <1 ND <5 <5 NA <1
06/26/02 2.8 <1 <1 <1 2.8 20 <5 NA <1
09/06/02 <0.5 <1 <1 <1 ND <5 <5 NA <1
03/28/03 <0.5 <1 <1 <1 ND <5 <5 NA <1
09/23/03 <0.5 <5 <1 <1 ND <5 <5 NA <1
04/01/04 1 <0.7 <0.8 <0.8 1 12 <0.8 NA <1
10/01/04 <1 <1 <1 <1 ND <8 <1 NA <1
05/12/05 <1 <1 <1 <1 ND 37 <1 NA <1
04/04/06 1.8 <5 <5 <5 1.8 42 <5 NA <1
11/01/06 <0.5 1 <0.8 <0.8 0.7 8 <0.8 NA <1
05/09/07 <0.5 2 <0.8 0.8 2.8 17 <0.8 <1 <1
11/28/07 <1 <5 <5 <10 ND 77 1.5J <5 <0.02
06/24/08 <0.1 <0.1 <0.1 <0.2 ND 33 0.72 <0.1 <0.02
08/25/09 <0.1 <0.2 <0.1 <0.1 ND 200 5.8 <0.1 <0.1
01/25/11 0.11 <0.1 <0.1 <0.3 ND 1,100 19 <0.1 <0.1
10/27/11 <0.5 <0.5 <0.5 <0.5 ND 93 2.1 <0.5 <0.5
07/12/12 <1 <1 <1 <1 ND 88 1.7 <1 <1
03/19/13 <0.5 <0.5 <0.5 <0.5 ND 18 0.5 <0.5 <0.5
05/28/14 <0.5 <0.5 <0.5 <0.5 ND 4.9 0.1J <0.5 <0.5
11/21/14 <0.1 <0.1 <0.1 <0.1 ND 33 0.7 <0.1 <0.1
03/03/15 NS NS NS NS NS NS NS NS NS
06/17/15 <0.1 <0.1 <0.1 <0.2 <0.5 27 0.5J <0.1 --
09/24/15 NS NS NS NS NS NS NS NS NS
12/16/15 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5
04/21/16 NS NS NS NS NS NS NS NS NS
06/06/16 <0.1 <0.1 <0.1 <0.1 ND 0.2J <0.1 <0.1 <0.1
12/14/16 <0.3 <0.2 <0.2 <0.6 ND 108 2.6 <0.5 <0.1
03/21/17 <0.60 <0.40 <0.40 <1.2 ND 183 2.8 <1.0 <0.20
6/6/2017 <0.3 <0.2 <0.2 <0.6 ND 0.23 <0.1 <0.5 <0.1
9/20/2017 <0.3 <0.2 <0.2 <0.6 ND 21.4 0.59 <0.5 <0.1
12/13/2017 <0.3 <0.2 <0.2 <0.6 ND 34.5 1.9 <0.5 <0.1
3/20/2018 <0.50 <0.50 <0.50 <0.50 ND 12.3 <0.10 <0.50 <0.10
6/20/2018 <0.50 <0.50 <0.50 <0.50 ND 1.6 <0.50 <0.50 <0.50
9/21/2018 <0.50 <0.50 <0.50 <0.50 ND 116 2.3 <0.50 <0.50
12/6/2018 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
3/12/2019 <0.50 <0.50 <0.50 <0.50 ND <0.50 11.8 <0.50 <0.50
6/11/2019 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
9/9/2019 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
12/2/2019 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
3/26/2020 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
6/30/2020 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
9/29/2020 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
12/22/2020 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
6/10/2021 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
9/27/2021 <0.50 <0.50 <0.50 <0.50 ND 3.6 <0.50 <0.50 <0.50
1/14/2022 <0.50 <0.50 <0.50 <0.50 ND 50.3 <0.50 <0.50 <0.50
4/21/2022 <0.50 <0.50 <0.50 <0.50 ND 8.1 0.18 J <0.50 <0.50
7/20/2022 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
10/17/2022 <0.50 <0.50 <0.50 <0.50 <0.50 0.93 <0.50 <0.50 <0.50
1 600 600 500 NE 20 70 6 0.02
5,000 260,000 80,000 50,000 NE 20,000 70,000 6,000 50
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. The 15A NCAC 02L .0202 Groundwater Quality Standards (2L Standards) were revised on January 21, 2021.
4. Concentrations in bold equal or exceed (2L Standard) in effect at the time of sampling.
5. GCL = Gross Contamination Level.
6. EDB = Ethylene dibromide (1,2-Dibromoethane).
7. BTEX = Benzene, Toluene, Ethylbenzene, and Total Xylenes.
8. MTBE = Methyl Tertiary Butyl Ether.
9. NS = Not sampled.
10. NA = Not analyzed.
11. J = Indicates constituent was detected above laboratory detection limit but below laboratory reporting limit.
GCL
GW08
Date
Sampled Benzene Isopropyl
ether NaphthaleneToluene EDBMTBE
2L Standard
Page 6 of 11
TABLE 4
HISTORICAL GROUNDWATER ANALYTICAL DATA
CIRCLE K STORE NO. 7930 (RM NO. 2681)
3700 GROOMETOWN ROAD
GREENSBORO, NORTH CAROLINA
ATC PROJECT NO. P662681390
Monitoring Ethyl-Total Total
Well benzene Xylenes BTEX
05/05/99 9,010 21,100 3,000 22,100 55,210 4,010 <500 NA <100
08/31/99 4,730 8,480 1,030 4,490 18,760 4,570 <500 NA <100
11/30/99 4,210 10,300 827 9,090 24,427 <1,000 <1,000 NA <200
02/29/00 4,860 12,100 950 11,400 29,310 16,100 <500 NA <100
05/31/00 7,230 15,500 2,130 14,100 38,960 13,100 <500 NA <100
09/12/00 9,030 18,400 2,310 16,700 46,440 11,800 <500 NA <100
12/14/00 5,800 12,800 1,810 10,700 31,110 12,100 <1,250 NA <250
03/22/01 5,800 10,600 1,700 11,000 29,100 14,000 <1,000 NA <200
06/28/01 5,190 13,300 2,000 11,100 31,590 19,600 <250 NA <50
09/27/01 7,560 13,700 1,660 15,000 37,920 20,500 476 NA <10
01/30/02 5,090 8,490 1,680 10,060 25,320 17,500 <250 NA <50
06/26/02 5,230 10,100 1,790 10,100 27,220 18,500 433 NA <25
09/06/02 5,000 9,030 1,770 10,500 26,300 14,500 <500 NA <100
03/28/03 6,030 12,500 2,050 10,300 30,880 31,600 585 NA <50
05/28/03 6,470 15,100 1,320 10,800 33,690 118,000 1,260 NA NA
09/23/03 2,920 5,720 894 5,790 15,324 72,100 848 NA <50
04/01/04 3,000 2,000 1,300 4,100 10,400 82,000 640 NA <50
10/01/04 2,000 570 730 1,840 5,140 46,000 250 NA <100
05/12/05 1,200 530 910 1,220 3,860 38,000 290 NA <50
04/04/06 3,300 6,500 1,100 6,300 17,200 58,000 <250 NA <50
11/01/06 2,700 5,900 1,000 5,800 15,400 73,000 760 NA <50
05/09/07 2,700 5,900 1,100 6,000 15,700 68,000 720 940 <50
11/28/07 2,200 5,100 1,100 6,200 14,600 61,000 680J <1,000 0.047
06/24/08 1,700 3,400 980 5,100 11,180 41,000 500 980 <0.021
08/25/09 1,700 4,500 1,300 7,900 15,400 24,000 430 790 <20
01/25/11 780 1,100 610 3,010 5,500 19,000 290 420 <0.1
10/27/11 790 1,800 670 4,100 7,360 25,000 340 1,100 <0.5
07/12/12 560 1,600 590 3,900 6,650 14,000 180 620 <100
03/19/13 900 2,400 900 5,000 9,200 16,000 200 1,000 <100
05/28/14 640 1,600 660 2,890 5,790 13,000 140 710 <100
11/21/14 160 670 280 1,490 2,600 13,000 130 440 <20
03/03/15 130 370 210 960 1,670 7,200 73 75 --
06/17/15 22J 15J 42J 62 141 5,200 47J 22J --
09/24/15 11 6.7J 30 40.4 88.1 5,400 50 20 <10
12/16/15 <25 <25 20J 37 57 5,000 31 31 <25
04/21/16 <5 <5 5.1J <5 5.1 2,500 18J 17J <5
06/06/16 <2 <2 <2 <2 ND 1,600 13 <2 <2
12/14/16 <6 <4 <4 <12 ND 1,930 14.3 <10 <2
03/21/17 <15 <10 <10 <30 ND 2,240 18.7 <25 <5.0
6/6/2017 <6.0 13.0 8.0 12.2 33.2 1,830 16.7 <10 <2
9/20/2017 6.2 16 10.9 13.4 46.5 1,390 13.2 14.5 <2
12/13/2017 <3.0 <2.0 6.1 <6.0 6.1 438 12.1 10.5 <1.0
3/20/2018 <5.0 <5.0 8.4 <5.0 8.4 578 <10 16.7 <1.0
6/20/2018 <0.50 <0.50 1.8 <0.50 1.8 140 6.8 3.9 <0.50
9/21/2018 <0.50 <0.50 4.1 <0.50 4.1 132 5.7 6.4 <0.50
12/6/2018 <0.50 <0.50 0.7 <0.50 0.7 18.5 2.9 1.1 <0.50
3/12/2019 <0.50 <0.50 <0.50 <0.50 ND 1.4 2.0 <0.50 <0.50
6/11/2019 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
9/9/2019 <0.50 0.53 <0.50 <0.50 0.53 1.1 1.6 <0.50 <0.50
12/2/2019 <0.50 <0.50 <0.50 <0.50 ND 1.3 1.9 <0.50 <0.50
3/26/2020 <0.50 <0.50 <0.50 <0.50 ND <0.50 1.0 <0.50 <0.50
6/30/2020 <0.50 <0.50 <0.50 <0.50 ND <0.50 0.56 <0.50 <0.50
9/29/2020 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
12/22/2020 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
6/10/2021 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
9/27/2021 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
1/14/2022 <0.50 <0.50 <0.50 <0.50 ND <0.50 0.27 J <0.50 <0.50
4/21/2022 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
7/20/2022 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
10/17/2022 0.33 J 0.71 <0.50 0.42 J 1.46 <0.50 <0.50 0.29 J <0.50
1 600 600 500 NE 20 70 6 0.02
5,000 260,000 80,000 50,000 NE 20,000 70,000 6,000 50
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. The 15A NCAC 02L .0202 Groundwater Quality Standards (2L Standards) were revised on January 21, 2021.
4. Concentrations in bold equal or exceed (2L Standard) in effect at the time of sampling.
5. GCL = Gross Contamination Level.
6. EDB = Ethylene dibromide (1,2-Dibromoethane).
7. BTEX = Benzene, Toluene, Ethylbenzene, and Total Xylenes.
8. MTBE = Methyl Tertiary Butyl Ether.
9. NS = Not sampled.
10. NA = Not analyzed.
11. J = Indicates constituent was detected above laboratory detection limit but below laboratory reporting limit.
GW09
2L Standard
GCL
Date
Sampled Benzene Toluene NaphthaleneMTBEIsopropyl
ether EDB
Page 7 of 11
TABLE 4
HISTORICAL GROUNDWATER ANALYTICAL DATA
CIRCLE K STORE NO. 7930 (RM NO. 2681)
3700 GROOMETOWN ROAD
GREENSBORO, NORTH CAROLINA
ATC PROJECT NO. P662681390
Monitoring Ethyl-Total Total
Well benzene Xylenes BTEX
04/14/00 <0.5 <1 <1 <1 ND <5 <5 NA <1
09/12/00 <0.5 <1 <1 <1 ND <5 <5 NA <1
12/14/00 <0.5 <1 <1 <1 ND <5 <5 NA <1
03/22/01 <0.5 <1 <1 <1 ND <5 <5 NA <1
06/28/01 <0.5 <1 <1 <1 ND <5 <5 NA <1
09/27/01 <0.5 1 <1 <1 1 <5 <5 NA <1
01/30/02 <0.5 <1 <1 <1 ND <5 <5 NA <1
06/26/02 <0.5 <1 <1 <1 ND <5 <5 NA <1
09/06/02 NS NS NS NS NS NS NS NS NS
03/28/03 NS NS NS NS NS NS NS NS NS
09/23/03 <0.5 <5 <1 <1 ND <5 <5 NA <1
04/01/04 NS NS NS NS NS NS NS NS NS
10/01/04 NS NS NS NS NS NS NS NS NS
05/12/05 NS NS NS NS NS NS NS NS NS
04/06/06 <1 <5 <5 <5 ND <5 <5 NA <1
11/01/06 <0.5 <0.7 <0.8 <0.8 ND <0.5 <0.8 NA <1
05/09/07 NS NS NS NS NS NS NS NS NS
11/28/07 <1 <5 <5 <10 ND <5 <5 <5 <0.02
06/24/08 <0.1 <0.1 <0.1 <0.2 ND <0.2 <0.1 0.14 <0.02
08/25/09 <0.1 <0.2 <0.1 <0.1 ND <0.2 <0.1 <0.1 <0.1
01/25/11 1.5 11 3.7 20 36.2 <0.6 <0.1 2.2 <0.1
10/27/11 <0.5 <0.5 <0.5 <0.5 ND <0.5 <0.5 <0.5 <0.5
07/12/12 <0.5 <0.5 <0.5 <0.5 ND <0.5 <0.5 <0.5 <0.5
03/19/13 <0.5 <0.5 <0.5 <0.5 ND <0.5 <0.5 <0.5 <0.5
05/08/14 <0.5 <0.5 <0.5 <0.5 ND <0.5 <0.5 <0.5 <0.5
11/21/14 <0.1 <0.1 <0.1 <0.1 ND <0.1 <0.1 <0.1 <0.1
03/03/15 NS NS NS NS NS NS NS NS NS
06/17/15 <0.1 <0.1 <0.1 <0.2 <0.5 <0.1 <0.1 <0.1 --
09/24/15 NS NS NS NS NS NS NS NS NS
12/16/15 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5
04/21/16 NS NS NS NS NS NS NS NS NS
06/06/16 <0.1 <0.1 <0.1 <0.1 ND <0.1 <0.1 <0.1 <0.1
12/14/16 <0.3 <0.2 <0.2 <0.6 ND <0.2 <0.1 <0.5 <0.1
03/21/17 NS NS NS NS NS NS NS NS NS
6/6/2017 <0.3 <0.2 <0.2 <0.6 ND <0.2 <0.1 <0.5 <0.1
9/20/2017 NS NS NS NS NS NS NS NS NS
12/13/2017 <0.3 <0.2 <0.2 <0.6 ND <0.2 <0.1 <0.5 <0.1
3/20/2018 NS NS NS NS NS NS NS NS NS
6/20/2018 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
9/21/2018 NS NS NS NS NS NS NS NS NS
12/6/2018 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
3/12/2019 NS NS NS NS NS NS NS NS NS
6/11/2019 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
12/2/2019 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
3/26/2020 NS NS NS NS NS NS NS NS NS
6/30/2020 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
12/22/2020 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
6/10/2021 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
1/14/2022 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
7/20/2022 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
1 600 600 500 NE 20 70 6 0.02
5,000 260,000 80,000 50,000 NE 20,000 70,000 6,000 50
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. The 15A NCAC 02L .0202 Groundwater Quality Standards (2L Standards) were revised on January 21, 2021.
4. Concentrations in bold equal or exceed (2L Standard) in effect at the time of sampling.
5. GCL = Gross Contamination Level.
6. EDB = Ethylene dibromide (1,2-Dibromoethane).
7. BTEX = Benzene, Toluene, Ethylbenzene, and Total Xylenes.
8. MTBE = Methyl Tertiary Butyl Ether.
9. NS = Not sampled.
10. NA = Not analyzed.
11. J = Indicates constituent was detected above laboratory detection limit but below laboratory reporting limit.
2L Standard
GCL
Date
Sampled
GW10
Toluene MTBE Isopropyl
ether Naphthalene EDBBenzene
Page 8 of 11
TABLE 4
HISTORICAL GROUNDWATER ANALYTICAL DATA
CIRCLE K STORE NO. 7930 (RM NO. 2681)
3700 GROOMETOWN ROAD
GREENSBORO, NORTH CAROLINA
ATC PROJECT NO. P662681390
Monitoring Ethyl-Total Total
Well benzene Xylenes BTEX
04/14/00 <0.5 <1 <1 <1 ND <5 <5 NA <1
09/12/00 <0.5 <1 <1 <1 ND <5 <5 NA <1
12/14/00 <0.5 <1 <1 <1 ND <5 <5 NA <1
03/22/01 <0.5 <1 <1 <1 ND <5 <5 NA <1
06/28/01 <0.5 <1 <1 <1 ND <5 <5 NA <1
09/27/01 <0.5 <1 <1 <1 ND <5 <5 NA <1
01/30/02 <0.5 <1 <1 <1 ND <5 <5 NA <1
06/26/02 <0.5 <1 <1 <1 ND <5 <5 NA <1
09/06/02 NS NS NS NS NS NS NS NS NS
03/28/03 NS NS NS NS NS NS NS NS NS
09/23/03 <0.5 <1 <1 <1 ND <5 <5 NA <1
04/01/04 NS NS NS NS NS NS NS NS NS
10/01/04 NS NS NS NS NS NS NS NS NS
05/12/05 NS NS NS NS NS NS NS NS NS
04/06/06 <1 <5 <5 <5 ND <5 <5 NA <1
11/01/06 <0.5 <0.7 <0.8 <0.8 ND <0.5 <0.8 NA <1
05/09/07 <0.5 <0.7 <0.8 <0.8 ND <0.5 <0.8 <1 <1
11/28/07 <1 <5 <5 <10 ND 1.1J <5 <5 <0.02
06/24/08 <0.1 <0.1 <0.1 <0.2 ND <0.2 <0.1 <0.1 <0.02
08/25/09 <0.1 <0.2 <0.1 <0.1 ND <0.2 <0.1 <0.1 <0.1
01/25/11 0.18 0.32 0.13 0.67 1.3 <0.2 <0.1 <0.1 <0.1
10/27/11 <0.5 <0.5 <0.5 <0.5 ND 0.2J <0.5 <0.5 <0.5
07/12/12 <0.5 <0.5 <0.5 <0.5 ND <0.5 <0.5 <0.5 <0.5
03/19/13 <0.5 <0.5 <0.5 <0.5 ND <0.5 <0.5 <0.5 <0.5
05/28/14 <0.5 <0.5 <0.5 <0.5 ND <0.5 <0.5 <0.5 <0.5
11/21/14 <0.1 <0.1 <0.1 <0.1 ND <0.1 <0.1 <0.1 <0.1
03/03/15 NS NS NS NS NS NS NS NS NS
06/17/15 <0.1 <0.1 <0.1 <0.2 <0.5 <0.1 <0.1 <0.1 --
09/24/15 NS NS NS NS NS NS NS NS NS
12/16/15 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5
04/21/16 NS NS NS NS NS NS NS NS NS
06/06/16 <0.1 <0.1 <0.1 <0.1 ND <0.1 <0.1 <0.1 <0.1
12/14/16 <0.3 <0.2 <0.2 <0.6 ND <0.2 <0.1 <0.5 <0.1
03/21/17 NS NS NS NS NS NS NS NS NS
6/6/2017 <0.3 <0.2 <0.2 <0.6 ND <0.2 <0.1 <0.5 <0.1
9/20/2017 NS NS NS NS NS NS NS NS NS
12/13/2017 <0.3 <0.2 <0.2 <0.6 ND <0.2 <0.1 <0.5 <0.1
3/20/2018 NS NS NS NS NS NS NS NS NS
6/20/2018 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
9/21/2018 NS NS NS NS NS NS NS NS NS
12/6/2018 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
3/12/2019 NS NS NS NS NS NS NS NS NS
6/11/2019 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
12/2/2019 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
3/26/2020 NS NS NS NS NS NS NS NS NS
6/30/2020 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
12/22/2020 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
6/10/2021 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
1/14/2022 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
7/20/2022 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
1 600 600 500 NE 20 70 6 0.02
5,000 260,000 80,000 50,000 NE 20,000 70,000 6,000 50
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. The 15A NCAC 02L .0202 Groundwater Quality Standards (2L Standards) were revised on January 21, 2021.
4. Concentrations in bold equal or exceed (2L Standard) in effect at the time of sampling.
5. GCL = Gross Contamination Level.
6. EDB = Ethylene dibromide (1,2-Dibromoethane).
7. BTEX = Benzene, Toluene, Ethylbenzene, and Total Xylenes.
8. MTBE = Methyl Tertiary Butyl Ether.
9. NS = Not sampled.
10. NA = Not analyzed.
11. J = Indicates constituent was detected above laboratory detection limit but below laboratory reporting limit.
GW11
EDB
GCL
2L Standard
NaphthaleneDate
Sampled Benzene Toluene MTBE Isopropyl
ether
Page 9 of 11
TABLE 4
HISTORICAL GROUNDWATER ANALYTICAL DATA
CIRCLE K STORE NO. 7930 (RM NO. 2681)
3700 GROOMETOWN ROAD
GREENSBORO, NORTH CAROLINA
ATC PROJECT NO. P662681390
Monitoring Ethyl-Total Total
Well benzene Xylenes BTEX
04/14/00 <0.5 <1 <1 <1 ND <5 <5 NA <1
09/12/00 <0.5 <1 <1 <1 ND <5 <5 NA <1
12/14/00 <0.5 <1 <1 <1 ND <5 <5 NA <1
03/22/01 <0.5 <1 <1 <1 ND <5 <5 NA <1
06/28/01 <0.5 <1 <1 <1 ND <5 <5 NA <1
09/27/01 <0.5 <1 <1 <1 ND <5 <5 NA <1
01/30/02 <0.5 <1 <1 <1 ND <5 <5 NA <1
06/26/02 <0.5 <1 <1 <1 ND <5 <5 NA <1
09/06/02 NS NS NS NS NS NS NS NS NS
03/28/03 NS NS NS NS NS NS NS NS NS
09/23/03 <0.5 <5 <1 <1 ND <5 <5 NA <1
04/01/04 NS NS NS NS NS NS NS NS NS
10/01/04 NS NS NS NS NS NS NS NS NS
05/12/05 NS NS NS NS NS NS NS NS NS
04/06/06 <1 <5 <5 <5 ND <5 <5.0 NA <1
11/01/06 <0.5 <0.7 <0.8 <0.8 ND <0.5 <0.8 NA <1
05/09/07 <0.5 <0.7 <0.8 <0.8 ND <0.5 <0.8 <1 <1
11/28/07 <1 <5 <5 <10 ND <5 <5 <5 <0.02
06/24/08 <0.1 <0.1 <0.1 <0.2 ND <0.2 <0.1 <0.1 <0.021
08/25/09 <0.1 <0.2 <0.1 <0.1 ND <0.2 <0.1 <0.1 <0.1
01/25/11 0.39 1.6 0.52 2.8 5.31 <0.2 <0.1 <0.1 <0.1
10/27/11 <0.5 <0.5 <0.5 <0.5 ND <0.5 <0.5 <0.5 <0.5
07/12/12 <0.5 <0.5 <0.5 <0.5 ND <0.5 <0.5 <0.5 <0.5
03/19/13 <0.5 <0.5 <0.5 <0.5 ND <0.5 <0.5 <0.5 <0.5
05/28/14 <0.5 <0.5 <0.5 <0.5 ND <0.5 <0.5 <0.5 <0.5
11/21/14 <0.1 <0.1 <0.1 <0.1 ND <0.1 <0.1 <0.1 <0.1
03/03/15 NS NS NS NS NS NS NS NS NS
06/17/15 <0.1 <0.1 <0.1 <0.2 <0.5 <0.1 <0.1 <0.1 --
09/24/15 NS NS NS NS NS NS NS NS NS
12/16/15 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5
04/21/16 NS NS NS NS NS NS NS NS NS
06/06/16 <0.1 <0.1 <0.1 <0.1 ND <0.1 <0.1 <0.1 <0.1
12/14/16 <0.3 0.29 <0.2 <0.6 0.29 <0.2 <0.1 <0.5 <0.1
03/21/17 NS NS NS NS NS NS NS NS NS
6/6/2017 <0.3 <0.2 <0.2 <0.6 ND <0.2 <0.1 <0.5 <0.1
9/20/2017 NS NS NS NS NS NS NS NS NS
12/13/2017 <0.3 <0.2 <0.2 <0.6 ND <0.2 <0.1 <0.5 <0.1
3/20/2018 NS NS NS NS NS NS NS NS NS
6/20/2018 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
9/21/2018 NS NS NS NS NS NS NS NS NS
12/6/2018 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
3/12/2019 NS NS NS NS NS NS NS NS NS
6/11/2019 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
12/2/2019 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
3/26/2020 NS NS NS NS NS NS NS NS NS
6/30/2020 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
12/22/2020 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
6/10/2021 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
1/14/2022 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
7/20/2022 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
1 600 600 500 NE 20 70 6 0.02
5,000 260,000 80,000 50,000 NE 20,000 70,000 6,000 50
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. The 15A NCAC 02L .0202 Groundwater Quality Standards (2L Standards) were revised on January 21, 2021.
4. Concentrations in bold equal or exceed (2L Standard) in effect at the time of sampling.
5. GCL = Gross Contamination Level.
6. EDB = Ethylene dibromide (1,2-Dibromoethane).
7. BTEX = Benzene, Toluene, Ethylbenzene, and Total Xylenes.
8. MTBE = Methyl Tertiary Butyl Ether.
9. NS = Not sampled.
10. NA = Not analyzed.
11. J = Indicates constituent was detected above laboratory detection limit but below laboratory reporting limit.
GW12
Isopropyl
ether
Date
Sampled Benzene Naphthalene EDBToluene
2L Standard
GCL
MTBE
Page 10 of 11
TABLE 4
HISTORICAL GROUNDWATER ANALYTICAL DATA
CIRCLE K STORE NO. 7930 (RM NO. 2681)
3700 GROOMETOWN ROAD
GREENSBORO, NORTH CAROLINA
ATC PROJECT NO. P662681390
Monitoring Ethyl-Total Total
Well benzene Xylenes BTEX
01/30/02 1,760 21 20 39 1,840 11,900 82 NA <10
06/26/02 1,340 62 <5 81 1,483 9,060 115 NA <5
09/06/02 1,170 27 9 16 1,222 6,460 119 NA <5
03/28/03 1,370 7 3 7 1,387 21,000 209 NA <1
09/23/03 1,640 <250 57 77 1,774 25,100 330 NA <50
04/01/04 1,100 23 37 34 1,794 20,000 200 NA <10
10/01/04 390 18 44 47 499 8,600 110 NA <50
05/12/05 570 28 80 80 758 18,000 400 NA <1
04/06/06 530 <250 <250 <250 530 8,200 <250 NA <50
11/01/06 380 13 61 48 502 7,200 81 NA <10
05/09/07 420 10 24 9 463 11,000 130 360 <10
11/28/07 220 <100 64J 79J 363 4,800 56J 250 <0.02
06/24/08 100 2.3 41 51 194.3 3,800 52 180 <0.02
08/25/09 170 54 19 67 310 8,900 150 77 <5
01/25/11 32 0.12 2.4 3.79 38.31 6,100 73 <0.1 <0.1
10/27/11 8.8J <25 5.2J <25 14 5,500 64 24J <25
07/12/12 5.9J <25 7.4J 13J 26.3 4,300 51 21J <25
03/19/13 <25 <25 <25 <25 ND 3,600 36 15J <25
05/28/14 <50 <50 <50 <50 ND 5,800 44J <50 <50
11/21/14 1.6J <0.5 2.6 2J 6.2 2,300 22 16 <0.5
03/03/15 1.6J <1.0 <1.0 <2.0 1.6J 2,300 23 7.2 --
06/17/15 <5.0 <5.0 <5.0 <10.0 <25.0 2,200 22J 7.8J --
09/24/15 1.1J <5.0 3.2J 1.3J 4.5 1,700 17 16 <5
12/16/15 <10 <10 <10 <10 <10 1,100 9.7J 8.1J <10
04/21/16 <1 <1 <1 <1 ND 730 8.1 <1 <1
06/06/16 <1 <1 1.3J <1 1.3 1,200 13 <1 <1
12/14/16 <3 <2 <2 <6 ND 878 9 <5 <1
03/21/17 <6.0 <4.0 <4.0 <12 ND 1,380 11.8 <10 2.1
6/6/2017 <6.0 7.3 <4.0 <12 7.3 1,370 12.7 <10 <2
9/20/2017 19.3 22.6 <4.0 <12 41.9 1,080 11.3 <10 <2
12/13/2017 <1.5 <1.0 <1.0 <3.0 ND 329 10.5 8.1 <0.5
3/20/2018 <5.0 <5.0 <5.0 <5.0 ND 1,090 9.8 <5.0 <1.0
6/20/2018 <10 <10 <10 <10 ND 1,080 10.5 <10 <10
9/21/2018 <2.5 <2.5 <2.5 <2.5 ND 730 6.6 3.4 <2.5
12/6/2018 <0.50 <10 <0.50 <0.50 ND 900 8.2 1.3 <0.50
3/12/2019 <0.50 <0.50 <0.50 <0.50 ND 1,030 10.9 1.3 <0.50
6/11/2019 <0.50 <0.50 <0.50 <0.50 ND 6.6 <0.50 0.80 <0.50
9/9/2019 <0.50 <0.50 <0.50 <0.50 ND 294 2.9 1.4 <0.50
12/2/2019 <2.5 <2.5 <2.5 <2.5 ND 2.9 <2.5 <2.5 <2.5
3/26/2020 3.6 24.4 4.7 22.5 55.2 295 3.1 <2.5 <2.5
6/30/2020 <0.50 <0.50 <0.50 <0.50 ND 126 2.9 0.82 <0.50
9/29/2020 <0.50 <0.50 <0.50 <0.50 ND 93 0.95 0.69 0.84
12/22/2020 <0.50 <0.50 <0.50 <0.50 ND 285 3.2 1.1 <0.50
6/10/2021 <0.50 <0.50 <0.50 <0.50 ND 33 <0.50 <0.50 <0.50
9/27/2021 <0.50 <0.50 <0.50 <0.50 ND 63.0 0.65 0.24 J <0.50
1/14/2022 <0.50 <0.50 <0.50 <0.50 ND 260 2.8 <0.50 <0.50
4/21/2022 <0.50 <0.50 <0.50 <0.50 ND 306 3.7 <0.50 <0.50
7/20/2022 <0.50 <0.50 <0.50 <0.50 ND 180 2.0 <0.50 <0.50
10/17/2022 <2.5 <2.5 <2.5 <2.5 <2.5 240 2.1 J <2.5 <2.5
1 600 600 500 NE 20 70 6 0.02
5,000 260,000 80,000 50,000 NE 20,000 70,000 6,000 50
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. The 15A NCAC 02L .0202 Groundwater Quality Standards (2L Standards) were revised on January 21, 2021.
4. Concentrations in bold equal or exceed (2L Standard) in effect at the time of sampling.
5. GCL = Gross Contamination Level.
6. EDB = Ethylene dibromide (1,2-Dibromoethane).
7. BTEX = Benzene, Toluene, Ethylbenzene, and Total Xylenes.
8. MTBE = Methyl Tertiary Butyl Ether.
9. NS = Not sampled.
10. NA = Not analyzed.
11. J = Indicates constituent was detected above laboratory detection limit but below laboratory reporting limit.
GW13
Naphthalene EDBDate
Sampled Benzene Toluene MTBE
2L Standard
GCL
Isopropyl
ether
Page 11 of 11
Year Area (FT^2)*Thickness (FT)
Effective Porosity
Volume (FT^3) Volume (L)
MTBE
Concentration
(ug/L**)Mass (kg)
2014 14,175 35 0.35 173,644 4,916,700 30,080 147.9
2015 4,500 35 0.35 55,125 1,560,857 9,700 15.1
2016 6,750 35 0.35 82,688 2,341,286 2930 6.9
2017 9,025 35 0.35 110,556 3,130,385 3455 10.8
2018 3,210 35 0.35 27,746 785,624 1111.65 0.9
Mar-19 1,800 35 0.35 27,746 785,624 1066.3 0.8
Jun-19 - 35 0.35 - - 0 0.0
Sep-19 707 35 0.35 8,661 245,228 294 0.1
Dec-19 2,376 35 0.35 29,106 824,133 322 0.3
Mar-20 1,600 35 0.35 19,600 554,971 297.8 0.2
Jun-20 1,170 35 0.35 14,333 405,823 126 0.051
Sep-20 1,000 35 0.35 12,250 346,857 93 0.032
Dec-20 1,000 35 0.35 12,250 346,857 285 0.099
Jun-21 1,000 35 0.35 12,250 346,857 33.2 0.012
Jan-22 2,000 35 0.35 24,500 693,714 310.3 0.215
Apr-22 2,000 35 0.35 24,500 693,714 306 0.212
Jul-22 2,000 35 0.35 24,500 693,714 180 0.125
Oct-22 2,000 35 0.35 24,500 693,714 240 0.166
Notes:
Year Area (FT^2)*Thickness (FT)
Effective Porosity
Volume (FT^3) Volume (L)
Benzene
Concentration
(ug/L**)Mass (kg)
2014 3,600 35 0.35 44,100 1,248,686 900 1.1
2015 3,200 35 0.35 39,200 1,109,943 22 0.024
2016 - 35 0.35 - - 0 0.0
2017 - 35 0.35 - - 0 0.0
2018 - 35 0.35 - - 0 0.0
Mar-19 - 35 0.35 - - 0 0.0
Jun-19 - 35 0.35 - - 0 0.0
Sep-19 - 35 0.35 - - 0 0.0
Dec-19 - 35 0.35 - - 0 0.0
Mar-20 500 35 0.35 6,125 173,429 3.6 0.0006
Jun-20 - 35 0.35 - - 0 0.0
Sep-20 - 35 0.35 - - 0 0.0
Dec-20 - 35 0.35 - - 0 0.0
Jun-21 - 35 0.35 - - 0 0.0
Jan-22 - 35 0.35 - - 0 0.0
Apr-22 - 35 0.35 - - 0 0.0
Jul-22 - 35 0.35 - - 0 0.0
Oct-22 - 35 0.35 - - 0.33 0.0
Notes:
TABLE 5
CONTAMINANT MASS CALCULATIONS
CIRCLE K No. 7930 (RM 2681)
3700 Groometown Road, Greensboro, NC
Incident # 15707
MASS CALCULATIONS (Groundwater)
MTBE
BENZENE
* Area based on groundwater impact in source area for benzene exceeding benzene 2Ls
** Sum of benzene concentrations in source area exceeding 2Ls - Input value
* Area based on groundwater impact in source area for MTBE exceeding MTBE 2Ls
** Sum of MTBE concentrations in source area exceeding 2Ls - Input value
MASS CALCULATIONS (Groundwater)
Page 1 of 1
Projected Mass Reduction %0
Soil Source Zone Mass (kg)0.00
Smear Source Mass (kg)0
Groundwater Zone Mass (kg)1.1
Total Mass: Baseline/Milestone (kg)1.1
12/14/2016 12/13/2017 12/6/2018 6/11/2019 9/9/2019 12/2/2019 3/26/2020 6/30/2020 9/29/2020 12/22/2020 6/10/2021 1/14/2022 4/21/2022 7/20/2022 10/17/2022
Measured Mass
Soil Source Zone (kg)NM NM NM NM NM NM NM NM NM NM NM NM NM NM NM
Smear Source Zone (kg)NM NM NM NM NM NM NM NM NM NM NM NM NM NM NM
Groundwater Zone (kg)0 0 0 0 0 0 0.0006 0 0 0 0 0 0 0 0
Removed Mass
Excavated From Soil/Smear (kg)NM NM NM NM NM NM NM NM NM NM NM NM NM NM NM
Extracted as Vapor/Gas (kg)0.124 0 0.05 0.05 0 0 0 0 0 0 0 0 0 0 0
Extracted as Liquid (kg)1.1 1.1 1.1 1.1 1.1 1.1 1.0994 1.1 1.1 1.1 1.1 1.1 1.1 1.1 1.1
Total Mass Removed (kg)1.224 1.1 1.1 1.1 1.1 1.1 1.0994 1.1 1.1 1.1 1.1 1.1 1.1 1.1 1.1
Revised Total Mass (kg)-0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Estimated Reduction Rate 111%100%100%100%100%100%99.95%100.00%100.00%100.00%100.00%100.00%100.00%100.00%100.00%
Reference Milestone (Label)Baseline Baseline Baseline Baseline Baseline Baseline Baseline Baseline Baseline Baseline Baseline Baseline Baseline Baseline Baseline
Reference Milestone (Value)1.1 1.1 1.1 1.1 1.1 1.1 1.1 1.1 1.1 1.1 1.1 1.1 1.1 1.1 1.1
TABLE 6
CONTAMINANT MASS REMOVAL (Benzene)
CIRCLE K No. 7930 (RM 2681)
3700 Groometown Road, Greensboro, NC
Incident # 15707
0.0
12/16/2015
0
Evaluation of Change in Benzene Contaminant Mass
Initial Mass Estimate
Initial
Baseline
(2014)
1.1
NM
NM
0.024
NM
98%
1.076
Baseline
1.076
Measured/Calculated Change in Contaminant Mass
Milestone Sampling Measurement Event Dates
Page 1 of 1
Initial Mass Estimate
Initial
Baseline
(2014)
Projected Mass Reduction %0
Soil Source Zone Mass (kg)0.00
Smear Source Mass (kg)0
Groundwater Zone Mass (kg)147.9
Total Mass: Baseline/Milestone (kg)147.9
12/14/2016 12/13/2017 12/6/2018 6/11/2019 9/9/2019 12/2/2019 3/26/2020 6/30/2020 9/29/2020 12/22/2020 6/10/2021 1/14/2022 4/21/2022 7/20/2022 10/17/2022
Measured Mass
Soil Source Zone (kg)NM NM NM NM NM NM NM NM NM NM NM NM NM NM NM
Smear Source Zone (kg)NM NM NM NM NM NM NM NM NM NM NM NM NM NM NM
Groundwater Zone (kg)6.9 10.8 0.9 0 0.1 0.3 0.2 0.051 0.032 0.099 0.012 0.215 0.212 0.125 0.166
Removed Mass
Excavated From Soil/Smear (kg)NM NM NM NM NM NM NM NM NM NM NM NM NM NM NM
Extracted as Vapor/Gas (kg)NM NM NM NM NM NM NM NM NM NM NM NM NM NM NM
Extracted as Liquid (kg)141 137.1 147 147.9 147.8 147.6 147.7 147.849 147.868 147.801 147.888 147.685 147.688 147.775 147.734
Total Mass Removed (kg)141 137.1 147 147.9 147.8 147.6 147.7 147.849 147.868 147.801 147.888 147.685 147.688 147.775 147.734
Revised Total Mass (kg)6.9 10.8 0.9 0.0 0.1 0.3 0.2 0.0510 0.0320 0.0990 0.0120 0.2150 0.2120 0.1250 0.1660
Estimated Reduction Rate 95%93%99.4%100.0%99.9%99.8%99.9%99.97%99.98%99.93%99.99%99.85%99.86%99.92%99.89%
Reference Milestone (Label)Baseline Baseline Baseline Baseline Baseline Baseline Baseline Baseline Baseline Baseline Baseline Baseline Baseline Baseline Baseline
Reference Milestone (Value)147.9 147.9 147.9 147.9 147.9 147.9 147.9 147.9 147.9 147.9 147.9 147.9 147.9 147.9 147.9
90%
Evaluation of Change in MTBE Contaminant Mass
Milestone Sampling Measurement Event Dates
TABLE 7
CONTAMINANT MASS REMOVAL (MTBE)
CIRCLE K No. 7930 (RM 2681)
3700 Groometown Road, Greensboro, NC
Incident # 15707
Measured/Calculated Change in Contaminant Mass
147.9
15.1
NM
NM
132.8
Baseline
132.8
NM
NM
15.1
12/16/2015
Page 1 of 1
TABLE 8
HISTORICAL WATER SUPPLY WELL ANALYTICAL DATA
CIRCLE K STORE NO. 7930 (RM NO. 2681)
3700 GROOMETOWN ROAD
GREENSBORO, NORTH CAROLINA
ATC PROJECT NO. P662681390
Water Supply
Well
Date
Sampled Benzene Toluene Ethyl-
benzene
Total
Xylenes Total BTEX MTBE Isopropyl Ether
4204 Wayne Rd 12/9/2020 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50
4206 Wayne Rd 12/9/2020 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50
4208 Wayne Rd 12/9/2020 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50
4210 Wayne Rd 12/9/2020 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50
2/29/2000 <0.5 1 <1 2 3 10 <5
4/4/2000 <0.5 <1 <1 <1 ND <5 <5
5/31/2000 <0.5 <1 <1 <1 ND <5 <5
1/18/2021 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50
1 600 600 500 NE 20 70
5,000 260,000 84,500 85,500 NE 20,000 70,000
Notes:
1. MTBE = Methyl Tertiary Butyl Ether.
2. IPE = Isopropyl Ether.
3. BTEX = Benzene, Toluene, Ethylbenzene, and Xylenes.
4. "<" or ND = Not Detected at or above the laboratory reporting limit.
5. Concentrations are reported in micrograms per liter (ug/l) = parts per billion (ppb).
6. Concentrations in bold equal or exceed the corresponding NCDEQ Groundwater Quality 2L Standard (2L Standard).
7. GCL = Gross Contamination Limit.
8. NE = Not Established.
Analytical Method EPA 6200B
2L Standard
GCLs
4217 Wayne Rd
Page 1 of 1
TABLE 9
HISTORICAL SOIL ANALYTICAL DATA
CIRCLE K STORE NO. 7930 (RM NO. 2681)
3700 GROOMETOWN ROAD
GREENSBORO, NORTH CAROLINA
ATC PROJECT NO. P662681390
Boring Depth OVA Petroleum Soil TPH as Gasoline TPH as Diesel
I.D.Date (feet bls)(ppm)Odor Conditions (mg/kg)(mg/kg)
GP-1 7/12/1996 0-2 100 slight dry
2-3 6 no dry
5-9 60 no dry
9-13*110 no dry <0.5 <10
13-17 10 no dry
17-21 11 no moist
GP-2 7/12/1996 0-5 NS no dry
5-9 30 no dry
9-13 75 no dry
13-17 100 no dry
17-21*120 no moist-wet 0.8 <10
GP-3 7/12/1996 0-5 NS no dry
5-9 110 no dry
9-13 70 no dry
13-17 290 no dry
17-21*310 no moist <0.5 <10
21-25 0 no saturated
GP-4 7/12/1996 0-5 NS no dry
5-9 130 no dry
9-13 48 no dry
13-17 28 no dry
17-21*280 no moist <0.5 <10
GP-5 7/12/1996 0-5 NS no dry
5-9 160 no dry
9-13 180 no dry
13-17 300 no dry
17-21*550 no moist <0.5 <10
GW01 1/28/1997 0-5 NS no dry
5-9 NS no dry
9-13 NS no dry
13-17 NS no moist
17-18*NS no moist 1.8 NS
20-25 NS no saturated
25-30 NS no saturated
30-35 NS no saturated
GW02 4/15/1997 3.5-5 2 no dry
8.5-10 5 no dry
13.5-15 13 no dry
18.5-20 14 no moist
23.5-25*18 no saturated 2.3 <10
28.5-30 0 no saturated
33.5-35 0 no saturated
38.5-40 0 no saturated
43.5-45 0 no saturated
48.5-50 0 no saturated
53-55 0 no saturated
58-60 0 no saturated
GW03 4/15/1997 3.5-5 0 no dry
8.5-10 0 no dry
13.5-15 0 no dry
18.5-20 0 no moist
23.5-25*0 no wet <0.5 83
28.5-30 0 no wet
GW04 4/15/1997 3.5-5 2 no dry
8.5-10 3 no dry
13.5-15 4 no dry
18.5-20*4 no moist 0.8 <10
23.5-25 1 no wet
28.5-30 0 no wetPage 1 of 2
TABLE 9
HISTORICAL SOIL ANALYTICAL DATA
CIRCLE K STORE NO. 7930 (RM NO. 2681)
3700 GROOMETOWN ROAD
GREENSBORO, NORTH CAROLINA
ATC PROJECT NO. P662681390
Boring Depth OVA Petroleum Soil TPH as Gasoline TPH as Diesel
I.D.Date (feet bls)(ppm)Odor Conditions (mg/kg)(mg/kg)
GW05 4/15/1997 3.5-5 3 no dry
8.5-10 0 no dry
13.5-15*11 no dry <0.5 <10
18.5-20 7 no moist
23.5-25 4 no wet
28.5-30 1 no wet
GW06 8/11/1997 3-5 NS no dry
8-10 NS no dry
13-15 NS no dry
18-20*NS no dry <0.5 NS
23-25 NS no moist
28-30 NS no moist
GW07 8/11/1997 4-6 NS no dry
9-11 NS no dry
14-16 NS no dry
19-21*NS no moist <0.5 NS
24-26 NS no moist
29-31 NS no wet
GW08 9/30/1997 4-5.5 NS no dry
9-10.5 NS no dry
14-15.5 NS no dry
19-20.5*NS no moist <0.5 NS
24-25.5 NS no moist
29-30.5 NS no moist
GW09 9/30/1997 4-5.5 NS no dry
9-10.5 NS no dry
14-15.5 NS no dry
19-20.5*NS no moist <0.5 NS
24-25.5 NS no moist
29-30.5 NS no moist
Notes:
1. Soil concentrations are reported in milligrams per kilogram (mg/kg) = parts per million (ppm).
2. bls = below land surface.
3. GP-5 and GW01 occupy the same location.
4. OVA = Organic Vapor Analyzer.
5. NS = Not Screened.
6. TPH = Total Petroleum Hydrocarbons.
Page 2 of 2
TABLE 10
GROUNDWATER EXPOSURE POINT CONCENTRATIONS
CIRCLE K STORE NO. 7930 (RM NO. 2681)
3700 GROOMETOWN ROAD
GREENSBORO, NORTH CAROLINA
ATC PROJECT NO. P662681390
Monitoring
Well Date Sampled
MTBEIsopropyl EtherIsopropylbenzene (Cumene)n-Butylbenzene Vinyl Acetate1/14/2022 260 2.8 <0.50 <0.50 <0.50
4/21/2022 306 3.7 <0.50 0.81 <0.50
7/20/2022 180 2.0 0.21 J <0.50 1.2
10/17/2022 240 2.1 J <2.5 <2.5 <2.5
306 3.7 0.21 0.81 1.2
Notes:
1. Representative concentration equals the maximum concentration detected for each compound (highlighted value).
2. Concentrations in bold exceed Title 15A NCAC 02L .0202 Groundwater Quality Standards.
3. J = Estimated result < Practical Quantification Limit and ≥ Method Detection Limit.
4. Acetone detections are attributed to laboratory contamination and are not included in this table.
5. Concentrations reported in micrograms per liter (µg/L).
Representative Concentration
GW13
Page 1 of 1
Circle K Store #7930 (RM #2681)
November 17, 2022

ATC Project No. P662681991 Phillips 66 Company
FIGURES
2725 E. Millbrook Road, Ste 121
Raleigh, NC 27604
[phone]
PROJECT NO: P662681390
DATE: 11/2022 REVIEWED BY: JR
CIRCLE K STORE NO. 7930 (RM NO. 2681)
3700 GROOMETOWN ROAD
GREENSBORO, GUILIFORD COUNTY,
NORTH CAROLINA 27407
SOURCE: 1994 TOPOGRAPHIC MAP -MSRMAPS.COM.
SCALE: SEE ABOVE
FIGURE 1: SITE TOPOGRAPHIC MAP
N
SITE
GW06WAYNE ROADGROOMETOWN ROADGW05USTBASINGW07GW10GW11CELLULARTOWERGW08GW13GW09GW02CIRCLE KSTORE #7930GW12PROPERTY BOUNDARY
GW06WAYNE ROADGROOMETOWN ROADGW05USTBASINGW07GW10GW11CELLULARTOWERGW08GW13GW09GW02CIRCLE KSTORE #7930GW12PROPERTY BOUNDARY(71.02)71.25(71.17)(71.24)(71.78)(NM)(NM)(NM)(NM)(NM)(NM)71.5071.7571.00
GW06WAYNE ROADGROOMETOWN ROADGW05USTBASINGW07GW10GW11CELLULARTOWERGW08GW13GW09GW02CIRCLE KSTORE #7930GW12PROPERTY BOUNDARY(240)(NS)(NS)(NS)(NS)(NS)(NS)20020
FIGURE 6
CONCENTRATION VERSUS TIME GRAPHS
CIRCLE K STORE NO. 7930 (RM NO. 2681)
3700 GROOMETOWN ROAD
GREENSBORO, NORTH CAROLINA
ATC PROJECT NO. P662681390
0
2,000
4,000
6,000
8,000
10,000
12,000
14,000
16,000
18,000
20,000
Concentration (ug/L)Date
GW07
Benzene
Total BTEX
MTBE
Naphthalene
Remediation System Start-up10/30/2014
0
2
4
6
8
10
12
14
16
18
20
Concentration (ug/L)Date
GW02
Benzene
Total BTEX
MTBE
Naphthalene
Remediation System Start-up10/30/2014 Remediation System Shut-down12/02/2021
0
500
1,000
1,500
2,000
2,500
Concentration (ug/L)Date
GW05
Benzene
Total BTEX
MTBE
Naphthalene
Remediation System Start-up
10/30/2014 Remediation System Shut-down12/02/2021
Remediation System Shut-down12/02/2021
Page 1 of 2
FIGURE 6
CONCENTRATION VERSUS TIME GRAPHS
CIRCLE K STORE NO. 7930 (RM NO. 2681)
3700 GROOMETOWN ROAD
GREENSBORO, NORTH CAROLINA
ATC PROJECT NO. P662681390
0
200
400
600
800
1,000
1,200
Concentration (ug/L)Date
GW08
Benzene
Total BTEX
MTBE
Naphthalene
Remediation System Start-up
10/30/2014
0
5,000
10,000
15,000
20,000
25,000
30,000
Concentration (ug/L)Date
GW09
Benzene
Total BTEX
MTBE
Naphthalene
Remediation System Start-up10/30/2014
0
1,000
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
10,000
Concentration (ug/L)Date
GW13
Benzene
Total BTEX
MTBE
Naphthalene
Remediation System Start-up10/30/2014
Remediation System Shut-down12/02/2021
Remediation System Shut-down12/02/2021
New ORC Sock Installation12/22/2020
New ORC Sock Installation09/27/2021
New ORC Sock Installation08/16/2022
Remediation System Shut-down12/02/2021
Page 2 of 2
GW06WAYNE ROADGROOMETOWN ROADGW05USTBASINGW07GW10GW11CELLULARTOWERGW08GW13GW09GW02CIRCLE KSTORE #7930GW12PROPERTY BOUNDARYPW-4217PW-4210PW-4208PW-4206PW-4204GROUNDWATERSOURCE AREAGROUNDWATERFLOW DIRECTION786' FROM SOURCE AREATO PROTECTION OFGROUNDWATER POE
Circle K Store #7930 (RM #2681)
November 17, 2022

ATC Project No. P662681991 Phillips 66 Company
APPENDIX A

GEOLOGIC CROSS-SECTIONS
APPENDIX A
APPENDIX A
APPENDIX A
Circle K Store #7930 (RM #2681)
November 17, 2022

ATC Project No. P662681991 Phillips 66 Company
APPENDIX B

LABORATORY ANALYTICAL RESULTS
10/27/22
Technical Report for
Atlas
RM#2681, 3700 Groometown Rd, Greensboro, NC
P662681991
SGS Job Number: LA84416
Sampling Date: 10/17/22
Report to:
ATC Group Services LLC.
2725 East Millbrook Road Suite 121
Raleigh, NC 27604
[e-mail]; [e-mail]
ATTN: Rick Kleinfelter
Total number of pages in report:
Certifications: LDEQ(2048), LDHH(LA150012), AR(14-045-04), AZ(AZ0805), FL(E87657), IL(200082), KY(#31),
NC(487), SC(73004001), NJ(LA007), TX(T104704186-18-16), WV(257)
This report shall not be reproduced, except in its entirety, without the written approval of SGS.
Test results relate only to samples analyzed.
SGS North America Inc. • 500 Ambassador Caffery • Scott, LA 70583 • tel: [phone]
Test results contained within this data package meet the requirements
of the National Environmental Laboratory Accreditation Program
and/or state specific certification programs as applicable.
Client Service contact: Ron Benjamin 337-237-4775
Ron Benjamin
Lab Director
Scott, LA 10/27/22
e-Hardcopy 2.0
Automated Report
41
SGS is the sole authority for authorizing edits or modifications to this document.
Unauthorized modification of this report is strictly prohibited.
Review standard terms at: http://www.sgs.com/en/terms-and-conditions
The results set forth herein are provided by SGS North America Inc.
Please share your ideas about
how we can serve you better at:
[e-mail]
1 of 41
LA84416
Table of Contents
-1-
Sections:
Section 1: Sample Summary ...................................................................................................3
Section 2: Summary of Hits ....................................................................................................4
Section 3: Sample Results ........................................................................................................5
3.1: LA84416-1: GW07 .......................................................................................................6
3.2: LA84416-2: GW08 .......................................................................................................9
3.3: LA84416-3: GW09 .......................................................................................................12
3.4: LA84416-4: GW13 .......................................................................................................15
Section 4: Misc. Forms ............................................................................................................18
4.1: Chain of Custody ...........................................................................................................19
Section 5: MS Volatiles - QC Data Summaries .....................................................................23
5.1: Method Blank Summary ................................................................................................24
5.2: Blank Spike/Blank Spike Duplicate Summary ..............................................................30
5.3: Matrix Spike/Matrix Spike Duplicate Summary ...........................................................36 123452 of 41
LA84416
SGS North America Inc.
Sample Summary
Atlas
Job No:LA84416
RM#2681, 3700 Groometown Rd, Greensboro, NC
Project No: P662681991
Sample Collected Matrix Client
Number Date Time By Received Code Type Sample ID
This report contains results reported as ND = Not detected. The following applies:
Organics ND = Not detected above the MDL
LA84416-1 10/17/22 12:40 BB 10/19/22 AQ Ground Water GW07
LA84416-2 10/17/22 13:10 BB 10/19/22 AQ Ground Water GW08
LA84416-3 10/17/22 14:55 BB 10/19/22 AQ Ground Water GW09
LA84416-4 10/17/22 13:45 BB 10/19/22 AQ Ground Water GW13
3 of 41
LA844161
Summary of Hits Page 1 of 1
Job Number:LA84416
Account:Atlas
Project:RM#2681, 3700 Groometown Rd, Greensboro, NC
Collected:10/17/22
Lab Sample ID Client Sample ID Result/
Analyte Qual RL MDL Units Method
LA84416-1 GW07
Methyl Tert Butyl Ether 3.4 0.50 0.068 ug/l SM 6200B
LA84416-2 GW08
Methyl Tert Butyl Ether 0.93 0.50 0.068 ug/l SM 6200B
LA84416-3 GW09
Acetone 3.5 J 10 1.2 ug/l SM 6200B
Benzene 0.33 J 0.50 0.27 ug/l SM 6200B
Methyl Chloride 2.5 0.50 0.066 ug/l SM 6200B
Naphthalene 0.29 J 0.50 0.10 ug/l SM 6200B
Toluene 0.71 0.50 0.29 ug/l SM 6200B
1,2,4-Trimethylbenzene 0.45 J 0.50 0.15 ug/l SM 6200B
1,3,5-Trimethylbenzene 0.20 J 0.50 0.16 ug/l SM 6200B
m,p-Xylene 0.42 J 1.0 0.34 ug/l SM 6200B
Xylene (total)0.42 J 0.50 0.16 ug/l SM 6200B
LA84416-4 GW13
Acetone 14.4 J 50 6.2 ug/l SM 6200B
Di-Isopropyl Ether 2.1 J 2.5 0.37 ug/l SM 6200B
Methyl Tert Butyl Ether 240 2.5 0.34 ug/l SM 6200B
4 of 41
LA844162
SGS North America Inc.
Sample Results
Report of Analysis
Scott, LA
Section 3
5 of 41
LA844163
SGS North America Inc.
Report of Analysis Page 1 of 3
Client Sample ID:GW07
Lab Sample ID:LA84416-1 Date Sampled:10/17/22
Matrix:AQ - Ground Water Date Received:10/19/22
Method:SM 6200B Percent Solids:n/a
Project:RM#2681, 3700 Groometown Rd, Greensboro, NC
File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
Run #1 2K0144478.D 1 10/21/22 19:47 MB n/a n/a V2K4011
Run #2
Purge Volume
Run #1 25.0 ml
Run #2
VOA Special List
CAS No.Compound Result RL MDL Units Q
67-64-1 Acetone ND 10 1.2 ug/l
107-13-1 Acrylonitrile ND 0.50 0.14 ug/l
71-43-2 Benzene ND 0.50 0.27 ug/l
108-86-1 Bromobenzene ND 0.50 0.18 ug/l
74-97-5 Bromochloromethane ND 0.50 0.12 ug/l
75-27-4 Bromodichloromethane ND 0.50 0.18 ug/l
75-25-2 Bromoform ND 0.50 0.10 ug/l
104-51-8 n-Butylbenzene ND 0.50 0.092 ug/l
135-98-8 sec-Butylbenzene ND 0.50 0.14 ug/l
98-06-6 tert-Butylbenzene ND 0.50 0.16 ug/l
75-15-0 Carbon Disulfide ND 0.50 0.14 ug/l
56-23-5 Carbon Tetrachloride ND 0.20 0.092 ug/l
108-90-7 Chlorobenzene ND 0.50 0.16 ug/l
75-00-3 Chloroethane ND 0.50 0.055 ug/l
67-66-3 Chloroform ND 0.50 0.094 ug/l
95-49-8 o-Chlorotoluene ND 0.50 0.16 ug/l
106-43-4 p-Chlorotoluene ND 0.50 0.20 ug/l
124-48-1 Dibromochloromethane ND 0.20 0.075 ug/l
96-12-8 1,2-Dibromo-3-chloropropane ND 0.50 0.13 ug/l
106-93-4 1,2-Dibromoethane ND 0.50 0.24 ug/l
75-71-8 Dichlorodifluoromethane ND 0.50 0.12 ug/l
541-73-1 m-Dichlorobenzene ND 0.50 0.063 ug/l
95-50-1 o-Dichlorobenzene ND 0.50 0.20 ug/l
106-46-7 p-Dichlorobenzene ND 0.50 0.22 ug/l
110-57-6 trans-1,4-Dichloro-2-Butene ND 0.50 0.27 ug/l
75-34-3 1,1-Dichloroethane ND 0.50 0.10 ug/l
107-06-2 1,2-Dichloroethane ND 0.20 0.12 ug/l
75-35-4 1,1-Dichloroethylene ND 0.50 0.094 ug/l
156-59-2 cis-1,2-Dichloroethylene ND 0.50 0.11 ug/l
156-60-5 trans-1,2-Dichloroethylene ND 0.50 0.15 ug/l
540-59-0 1,2-Dichloroethene (total)ND 0.50 0.17 ug/l
78-87-5 1,2-Dichloropropane ND 0.30 0.13 ug/l
ND = Not detected MDL = Method Detection Limit J = Indicates an estimated value
RL = Reporting Limit B = Indicates analyte found in associated method blank
E = Indicates value exceeds calibration range N = Indicates presumptive evidence of a compound
6 of 41
LA8441633.1
SGS North America Inc.
Report of Analysis Page 2 of 3
Client Sample ID:GW07
Lab Sample ID:LA84416-1 Date Sampled:10/17/22
Matrix:AQ - Ground Water Date Received:10/19/22
Method:SM 6200B Percent Solids:n/a
Project:RM#2681, 3700 Groometown Rd, Greensboro, NC
VOA Special List
CAS No.Compound Result RL MDL Units Q
142-28-9 1,3-Dichloropropane ND 0.50 0.21 ug/l
594-20-7 2,2-Dichloropropane ND 0.50 0.079 ug/l
563-58-6 1,1-Dichloropropene ND 0.50 0.12 ug/l
10061-01-5 cis-1,3-Dichloropropene ND 0.20 0.10 ug/l
10061-02-6 trans-1,3-Dichloropropene ND 0.20 0.056 ug/l
108-20-3 Di-Isopropyl Ether ND 0.50 0.073 ug/l
100-41-4 Ethylbenzene ND 0.50 0.20 ug/l
591-78-6 2-Hexanone ND 1.0 0.42 ug/l
87-68-3 Hexachlorobutadiene ND 0.20 0.11 ug/l
98-82-8 Isopropylbenzene ND 0.50 0.13 ug/l
99-87-6 p-Isopropyltoluene ND 0.50 0.13 ug/l
74-83-9 Methyl Bromide ND 0.50 0.23 ug/l
74-87-3 Methyl Chloride ND 0.50 0.066 ug/l
74-95-3 Methylene Bromide ND 0.50 0.11 ug/l
75-09-2 Methylene Chloride ND 0.50 0.080 ug/l
78-93-3 Methyl Ethyl Ketone ND 25 0.28 ug/l
108-10-1 4-Methyl-2-pentanone ND 0.50 0.24 ug/l
1634-04-4 Methyl Tert Butyl Ether 3.4 0.50 0.068 ug/l
91-20-3 Naphthalene ND 0.50 0.10 ug/l
103-65-1 n-Propylbenzene ND 0.50 0.22 ug/l
100-42-5 Styrene ND 0.50 0.13 ug/l
630-20-6 1,1,1,2-Tetrachloroethane ND 0.50 0.18 ug/l
79-34-5 1,1,2,2-Tetrachloroethane ND 0.20 0.12 ug/l
127-18-4 Tetrachloroethylene ND 0.50 0.22 ug/l
108-88-3 Toluene ND 0.50 0.29 ug/l
87-61-6 1,2,3-Trichlorobenzene ND 0.50 0.16 ug/l
120-82-1 1,2,4-Trichlorobenzene ND 0.50 0.17 ug/l
71-55-6 1,1,1-Trichloroethane ND 0.50 0.16 ug/l
79-00-5 1,1,2-Trichloroethane ND 0.30 0.17 ug/l
79-01-6 Trichloroethylene ND 0.50 0.18 ug/l
75-69-4 Trichlorofluoromethane ND 0.50 0.073 ug/l
96-18-4 1,2,3-Trichloropropane ND 0.50 0.023 ug/l
95-63-6 1,2,4-Trimethylbenzene ND 0.50 0.15 ug/l
108-67-8 1,3,5-Trimethylbenzene ND 0.50 0.16 ug/l
108-05-4 Vinyl Acetate ND 0.50 0.069 ug/l
75-01-4 Vinyl Chloride ND 0.10 0.075 ug/l
m,p-Xylene ND 1.0 0.34 ug/l
95-47-6 o-Xylene ND 0.50 0.15 ug/l
1330-20-7 Xylene (total)ND 0.50 0.16 ug/l
ND = Not detected MDL = Method Detection Limit J = Indicates an estimated value
RL = Reporting Limit B = Indicates analyte found in associated method blank
E = Indicates value exceeds calibration range N = Indicates presumptive evidence of a compound
7 of 41
LA8441633.1
SGS North America Inc.
Report of Analysis Page 3 of 3
Client Sample ID:GW07
Lab Sample ID:LA84416-1 Date Sampled:10/17/22
Matrix:AQ - Ground Water Date Received:10/19/22
Method:SM 6200B Percent Solids:n/a
Project:RM#2681, 3700 Groometown Rd, Greensboro, NC
VOA Special List
CAS No.Surrogate Recoveries Run# 1 Run# 2 Limits
17060-07-0 1,2-Dichloroethane-D4 101%70-130%
2037-26-5 Toluene-D8 98%70-130%
460-00-4 4-Bromofluorobenzene 97%70-130%
ND = Not detected MDL = Method Detection Limit J = Indicates an estimated value
RL = Reporting Limit B = Indicates analyte found in associated method blank
E = Indicates value exceeds calibration range N = Indicates presumptive evidence of a compound
8 of 41
LA8441633.1
SGS North America Inc.
Report of Analysis Page 1 of 3
Client Sample ID:GW08
Lab Sample ID:LA84416-2 Date Sampled:10/17/22
Matrix:AQ - Ground Water Date Received:10/19/22
Method:SM 6200B Percent Solids:n/a
Project:RM#2681, 3700 Groometown Rd, Greensboro, NC
File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
Run #1 2K0144479.D 1 10/21/22 20:17 MB n/a n/a V2K4011
Run #2
Purge Volume
Run #1 25.0 ml
Run #2
VOA Special List
CAS No.Compound Result RL MDL Units Q
67-64-1 Acetone ND 10 1.2 ug/l
107-13-1 Acrylonitrile ND 0.50 0.14 ug/l
71-43-2 Benzene ND 0.50 0.27 ug/l
108-86-1 Bromobenzene ND 0.50 0.18 ug/l
74-97-5 Bromochloromethane ND 0.50 0.12 ug/l
75-27-4 Bromodichloromethane ND 0.50 0.18 ug/l
75-25-2 Bromoform ND 0.50 0.10 ug/l
104-51-8 n-Butylbenzene ND 0.50 0.092 ug/l
135-98-8 sec-Butylbenzene ND 0.50 0.14 ug/l
98-06-6 tert-Butylbenzene ND 0.50 0.16 ug/l
75-15-0 Carbon Disulfide ND 0.50 0.14 ug/l
56-23-5 Carbon Tetrachloride ND 0.20 0.092 ug/l
108-90-7 Chlorobenzene ND 0.50 0.16 ug/l
75-00-3 Chloroethane ND 0.50 0.055 ug/l
67-66-3 Chloroform ND 0.50 0.094 ug/l
95-49-8 o-Chlorotoluene ND 0.50 0.16 ug/l
106-43-4 p-Chlorotoluene ND 0.50 0.20 ug/l
124-48-1 Dibromochloromethane ND 0.20 0.075 ug/l
96-12-8 1,2-Dibromo-3-chloropropane ND 0.50 0.13 ug/l
106-93-4 1,2-Dibromoethane ND 0.50 0.24 ug/l
75-71-8 Dichlorodifluoromethane ND 0.50 0.12 ug/l
541-73-1 m-Dichlorobenzene ND 0.50 0.063 ug/l
95-50-1 o-Dichlorobenzene ND 0.50 0.20 ug/l
106-46-7 p-Dichlorobenzene ND 0.50 0.22 ug/l
110-57-6 trans-1,4-Dichloro-2-Butene ND 0.50 0.27 ug/l
75-34-3 1,1-Dichloroethane ND 0.50 0.10 ug/l
107-06-2 1,2-Dichloroethane ND 0.20 0.12 ug/l
75-35-4 1,1-Dichloroethylene ND 0.50 0.094 ug/l
156-59-2 cis-1,2-Dichloroethylene ND 0.50 0.11 ug/l
156-60-5 trans-1,2-Dichloroethylene ND 0.50 0.15 ug/l
540-59-0 1,2-Dichloroethene (total)ND 0.50 0.17 ug/l
78-87-5 1,2-Dichloropropane ND 0.30 0.13 ug/l
ND = Not detected MDL = Method Detection Limit J = Indicates an estimated value
RL = Reporting Limit B = Indicates analyte found in associated method blank
E = Indicates value exceeds calibration range N = Indicates presumptive evidence of a compound
9 of 41
LA8441633.2
SGS North America Inc.
Report of Analysis Page 2 of 3
Client Sample ID:GW08
Lab Sample ID:LA84416-2 Date Sampled:10/17/22
Matrix:AQ - Ground Water Date Received:10/19/22
Method:SM 6200B Percent Solids:n/a
Project:RM#2681, 3700 Groometown Rd, Greensboro, NC
VOA Special List
CAS No.Compound Result RL MDL Units Q
142-28-9 1,3-Dichloropropane ND 0.50 0.21 ug/l
594-20-7 2,2-Dichloropropane ND 0.50 0.079 ug/l
563-58-6 1,1-Dichloropropene ND 0.50 0.12 ug/l
10061-01-5 cis-1,3-Dichloropropene ND 0.20 0.10 ug/l
10061-02-6 trans-1,3-Dichloropropene ND 0.20 0.056 ug/l
108-20-3 Di-Isopropyl Ether ND 0.50 0.073 ug/l
100-41-4 Ethylbenzene ND 0.50 0.20 ug/l
591-78-6 2-Hexanone ND 1.0 0.42 ug/l
87-68-3 Hexachlorobutadiene ND 0.20 0.11 ug/l
98-82-8 Isopropylbenzene ND 0.50 0.13 ug/l
99-87-6 p-Isopropyltoluene ND 0.50 0.13 ug/l
74-83-9 Methyl Bromide ND 0.50 0.23 ug/l
74-87-3 Methyl Chloride ND 0.50 0.066 ug/l
74-95-3 Methylene Bromide ND 0.50 0.11 ug/l
75-09-2 Methylene Chloride ND 0.50 0.080 ug/l
78-93-3 Methyl Ethyl Ketone ND 25 0.28 ug/l
108-10-1 4-Methyl-2-pentanone ND 0.50 0.24 ug/l
1634-04-4 Methyl Tert Butyl Ether 0.93 0.50 0.068 ug/l
91-20-3 Naphthalene ND 0.50 0.10 ug/l
103-65-1 n-Propylbenzene ND 0.50 0.22 ug/l
100-42-5 Styrene ND 0.50 0.13 ug/l
630-20-6 1,1,1,2-Tetrachloroethane ND 0.50 0.18 ug/l
79-34-5 1,1,2,2-Tetrachloroethane ND 0.20 0.12 ug/l
127-18-4 Tetrachloroethylene ND 0.50 0.22 ug/l
108-88-3 Toluene ND 0.50 0.29 ug/l
87-61-6 1,2,3-Trichlorobenzene ND 0.50 0.16 ug/l
120-82-1 1,2,4-Trichlorobenzene ND 0.50 0.17 ug/l
71-55-6 1,1,1-Trichloroethane ND 0.50 0.16 ug/l
79-00-5 1,1,2-Trichloroethane ND 0.30 0.17 ug/l
79-01-6 Trichloroethylene ND 0.50 0.18 ug/l
75-69-4 Trichlorofluoromethane ND 0.50 0.073 ug/l
96-18-4 1,2,3-Trichloropropane ND 0.50 0.023 ug/l
95-63-6 1,2,4-Trimethylbenzene ND 0.50 0.15 ug/l
108-67-8 1,3,5-Trimethylbenzene ND 0.50 0.16 ug/l
108-05-4 Vinyl Acetate ND 0.50 0.069 ug/l
75-01-4 Vinyl Chloride ND 0.10 0.075 ug/l
m,p-Xylene ND 1.0 0.34 ug/l
95-47-6 o-Xylene ND 0.50 0.15 ug/l
1330-20-7 Xylene (total)ND 0.50 0.16 ug/l
ND = Not detected MDL = Method Detection Limit J = Indicates an estimated value
RL = Reporting Limit B = Indicates analyte found in associated method blank
E = Indicates value exceeds calibration range N = Indicates presumptive evidence of a compound
10 of 41
LA8441633.2
SGS North America Inc.
Report of Analysis Page 3 of 3
Client Sample ID:GW08
Lab Sample ID:LA84416-2 Date Sampled:10/17/22
Matrix:AQ - Ground Water Date Received:10/19/22
Method:SM 6200B Percent Solids:n/a
Project:RM#2681, 3700 Groometown Rd, Greensboro, NC
VOA Special List
CAS No.Surrogate Recoveries Run# 1 Run# 2 Limits
17060-07-0 1,2-Dichloroethane-D4 97%70-130%
2037-26-5 Toluene-D8 101%70-130%
460-00-4 4-Bromofluorobenzene 92%70-130%
ND = Not detected MDL = Method Detection Limit J = Indicates an estimated value
RL = Reporting Limit B = Indicates analyte found in associated method blank
E = Indicates value exceeds calibration range N = Indicates presumptive evidence of a compound
11 of 41
LA8441633.2
SGS North America Inc.
Report of Analysis Page 1 of 3
Client Sample ID:GW09
Lab Sample ID:LA84416-3 Date Sampled:10/17/22
Matrix:AQ - Ground Water Date Received:10/19/22
Method:SM 6200B Percent Solids:n/a
Project:RM#2681, 3700 Groometown Rd, Greensboro, NC
File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
Run #1 2K0144480.D 1 10/21/22 20:46 MB n/a n/a V2K4011
Run #2
Purge Volume
Run #1 25.0 ml
Run #2
VOA Special List
CAS No.Compound Result RL MDL Units Q
67-64-1 Acetone 3.5 10 1.2 ug/l J
107-13-1 Acrylonitrile ND 0.50 0.14 ug/l
71-43-2 Benzene 0.33 0.50 0.27 ug/l J
108-86-1 Bromobenzene ND 0.50 0.18 ug/l
74-97-5 Bromochloromethane ND 0.50 0.12 ug/l
75-27-4 Bromodichloromethane ND 0.50 0.18 ug/l
75-25-2 Bromoform ND 0.50 0.10 ug/l
104-51-8 n-Butylbenzene ND 0.50 0.092 ug/l
135-98-8 sec-Butylbenzene ND 0.50 0.14 ug/l
98-06-6 tert-Butylbenzene ND 0.50 0.16 ug/l
75-15-0 Carbon Disulfide ND 0.50 0.14 ug/l
56-23-5 Carbon Tetrachloride ND 0.20 0.092 ug/l
108-90-7 Chlorobenzene ND 0.50 0.16 ug/l
75-00-3 Chloroethane ND 0.50 0.055 ug/l
67-66-3 Chloroform ND 0.50 0.094 ug/l
95-49-8 o-Chlorotoluene ND 0.50 0.16 ug/l
106-43-4 p-Chlorotoluene ND 0.50 0.20 ug/l
124-48-1 Dibromochloromethane ND 0.20 0.075 ug/l
96-12-8 1,2-Dibromo-3-chloropropane ND 0.50 0.13 ug/l
106-93-4 1,2-Dibromoethane ND 0.50 0.24 ug/l
75-71-8 Dichlorodifluoromethane ND 0.50 0.12 ug/l
541-73-1 m-Dichlorobenzene ND 0.50 0.063 ug/l
95-50-1 o-Dichlorobenzene ND 0.50 0.20 ug/l
106-46-7 p-Dichlorobenzene ND 0.50 0.22 ug/l
110-57-6 trans-1,4-Dichloro-2-Butene ND 0.50 0.27 ug/l
75-34-3 1,1-Dichloroethane ND 0.50 0.10 ug/l
107-06-2 1,2-Dichloroethane ND 0.20 0.12 ug/l
75-35-4 1,1-Dichloroethylene ND 0.50 0.094 ug/l
156-59-2 cis-1,2-Dichloroethylene ND 0.50 0.11 ug/l
156-60-5 trans-1,2-Dichloroethylene ND 0.50 0.15 ug/l
540-59-0 1,2-Dichloroethene (total)ND 0.50 0.17 ug/l
78-87-5 1,2-Dichloropropane ND 0.30 0.13 ug/l
ND = Not detected MDL = Method Detection Limit J = Indicates an estimated value
RL = Reporting Limit B = Indicates analyte found in associated method blank
E = Indicates value exceeds calibration range N = Indicates presumptive evidence of a compound
12 of 41
LA8441633.3
SGS North America Inc.
Report of Analysis Page 2 of 3
Client Sample ID:GW09
Lab Sample ID:LA84416-3 Date Sampled:10/17/22
Matrix:AQ - Ground Water Date Received:10/19/22
Method:SM 6200B Percent Solids:n/a
Project:RM#2681, 3700 Groometown Rd, Greensboro, NC
VOA Special List
CAS No.Compound Result RL MDL Units Q
142-28-9 1,3-Dichloropropane ND 0.50 0.21 ug/l
594-20-7 2,2-Dichloropropane ND 0.50 0.079 ug/l
563-58-6 1,1-Dichloropropene ND 0.50 0.12 ug/l
10061-01-5 cis-1,3-Dichloropropene ND 0.20 0.10 ug/l
10061-02-6 trans-1,3-Dichloropropene ND 0.20 0.056 ug/l
108-20-3 Di-Isopropyl Ether ND 0.50 0.073 ug/l
100-41-4 Ethylbenzene ND 0.50 0.20 ug/l
591-78-6 2-Hexanone ND 1.0 0.42 ug/l
87-68-3 Hexachlorobutadiene ND 0.20 0.11 ug/l
98-82-8 Isopropylbenzene ND 0.50 0.13 ug/l
99-87-6 p-Isopropyltoluene ND 0.50 0.13 ug/l
74-83-9 Methyl Bromide ND 0.50 0.23 ug/l
74-87-3 Methyl Chloride 2.5 0.50 0.066 ug/l
74-95-3 Methylene Bromide ND 0.50 0.11 ug/l
75-09-2 Methylene Chloride ND 0.50 0.080 ug/l
78-93-3 Methyl Ethyl Ketone ND 25 0.28 ug/l
108-10-1 4-Methyl-2-pentanone ND 0.50 0.24 ug/l
1634-04-4 Methyl Tert Butyl Ether ND 0.50 0.068 ug/l
91-20-3 Naphthalene 0.29 0.50 0.10 ug/l J
103-65-1 n-Propylbenzene ND 0.50 0.22 ug/l
100-42-5 Styrene ND 0.50 0.13 ug/l
630-20-6 1,1,1,2-Tetrachloroethane ND 0.50 0.18 ug/l
79-34-5 1,1,2,2-Tetrachloroethane ND 0.20 0.12 ug/l
127-18-4 Tetrachloroethylene ND 0.50 0.22 ug/l
108-88-3 Toluene 0.71 0.50 0.29 ug/l
87-61-6 1,2,3-Trichlorobenzene ND 0.50 0.16 ug/l
120-82-1 1,2,4-Trichlorobenzene ND 0.50 0.17 ug/l
71-55-6 1,1,1-Trichloroethane ND 0.50 0.16 ug/l
79-00-5 1,1,2-Trichloroethane ND 0.30 0.17 ug/l
79-01-6 Trichloroethylene ND 0.50 0.18 ug/l
75-69-4 Trichlorofluoromethane ND 0.50 0.073 ug/l
96-18-4 1,2,3-Trichloropropane ND 0.50 0.023 ug/l
95-63-6 1,2,4-Trimethylbenzene 0.45 0.50 0.15 ug/l J
108-67-8 1,3,5-Trimethylbenzene 0.20 0.50 0.16 ug/l J
108-05-4 Vinyl Acetate ND 0.50 0.069 ug/l
75-01-4 Vinyl Chloride ND 0.10 0.075 ug/l
m,p-Xylene 0.42 1.0 0.34 ug/l J
95-47-6 o-Xylene ND 0.50 0.15 ug/l
1330-20-7 Xylene (total)0.42 0.50 0.16 ug/l J
ND = Not detected MDL = Method Detection Limit J = Indicates an estimated value
RL = Reporting Limit B = Indicates analyte found in associated method blank
E = Indicates value exceeds calibration range N = Indicates presumptive evidence of a compound
13 of 41
LA8441633.3
SGS North America Inc.
Report of Analysis Page 3 of 3
Client Sample ID:GW09
Lab Sample ID:LA84416-3 Date Sampled:10/17/22
Matrix:AQ - Ground Water Date Received:10/19/22
Method:SM 6200B Percent Solids:n/a
Project:RM#2681, 3700 Groometown Rd, Greensboro, NC
VOA Special List
CAS No.Surrogate Recoveries Run# 1 Run# 2 Limits
17060-07-0 1,2-Dichloroethane-D4 92%70-130%
2037-26-5 Toluene-D8 98%70-130%
460-00-4 4-Bromofluorobenzene 92%70-130%
ND = Not detected MDL = Method Detection Limit J = Indicates an estimated value
RL = Reporting Limit B = Indicates analyte found in associated method blank
E = Indicates value exceeds calibration range N = Indicates presumptive evidence of a compound
14 of 41
LA8441633.3
SGS North America Inc.
Report of Analysis Page 1 of 3
Client Sample ID:GW13
Lab Sample ID:LA84416-4 Date Sampled:10/17/22
Matrix:AQ - Ground Water Date Received:10/19/22
Method:SM 6200B Percent Solids:n/a
Project:RM#2681, 3700 Groometown Rd, Greensboro, NC
File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
Run #1 2K0144562.D 5 10/25/22 00:35 MB n/a n/a V2K4015
Run #2
Purge Volume
Run #1 25.0 ml
Run #2
VOA Special List
CAS No.Compound Result RL MDL Units Q
67-64-1 Acetone 14.4 50 6.2 ug/l J
107-13-1 Acrylonitrile ND 2.5 0.70 ug/l
71-43-2 Benzene ND 2.5 1.4 ug/l
108-86-1 Bromobenzene ND 2.5 0.91 ug/l
74-97-5 Bromochloromethane ND 2.5 0.61 ug/l
75-27-4 Bromodichloromethane ND 2.5 0.90 ug/l
75-25-2 Bromoform ND 2.5 0.50 ug/l
104-51-8 n-Butylbenzene ND 2.5 0.46 ug/l
135-98-8 sec-Butylbenzene ND 2.5 0.71 ug/l
98-06-6 tert-Butylbenzene ND 2.5 0.79 ug/l
75-15-0 Carbon Disulfide ND 2.5 0.69 ug/l
56-23-5 Carbon Tetrachloride ND 1.0 0.46 ug/l
108-90-7 Chlorobenzene ND 2.5 0.82 ug/l
75-00-3 Chloroethane ND 2.5 0.28 ug/l
67-66-3 Chloroform ND 2.5 0.47 ug/l
95-49-8 o-Chlorotoluene ND 2.5 0.82 ug/l
106-43-4 p-Chlorotoluene ND 2.5 1.0 ug/l
124-48-1 Dibromochloromethane ND 1.0 0.37 ug/l
96-12-8 1,2-Dibromo-3-chloropropane ND 2.5 0.64 ug/l
106-93-4 1,2-Dibromoethane ND 2.5 1.2 ug/l
75-71-8 Dichlorodifluoromethane ND 2.5 0.61 ug/l
541-73-1 m-Dichlorobenzene ND 2.5 0.32 ug/l
95-50-1 o-Dichlorobenzene ND 2.5 0.98 ug/l
106-46-7 p-Dichlorobenzene ND 2.5 1.1 ug/l
110-57-6 trans-1,4-Dichloro-2-Butene ND 2.5 1.4 ug/l
75-34-3 1,1-Dichloroethane ND 2.5 0.52 ug/l
107-06-2 1,2-Dichloroethane ND 1.0 0.61 ug/l
75-35-4 1,1-Dichloroethylene ND 2.5 0.47 ug/l
156-59-2 cis-1,2-Dichloroethylene ND 2.5 0.55 ug/l
156-60-5 trans-1,2-Dichloroethylene ND 2.5 0.77 ug/l
540-59-0 1,2-Dichloroethene (total)ND 2.5 0.86 ug/l
78-87-5 1,2-Dichloropropane ND 1.5 0.63 ug/l
ND = Not detected MDL = Method Detection Limit J = Indicates an estimated value
RL = Reporting Limit B = Indicates analyte found in associated method blank
E = Indicates value exceeds calibration range N = Indicates presumptive evidence of a compound
15 of 41
LA8441633.4
SGS North America Inc.
Report of Analysis Page 2 of 3
Client Sample ID:GW13
Lab Sample ID:LA84416-4 Date Sampled:10/17/22
Matrix:AQ - Ground Water Date Received:10/19/22
Method:SM 6200B Percent Solids:n/a
Project:RM#2681, 3700 Groometown Rd, Greensboro, NC
VOA Special List
CAS No.Compound Result RL MDL Units Q
142-28-9 1,3-Dichloropropane ND 2.5 1.0 ug/l
594-20-7 2,2-Dichloropropane ND 2.5 0.40 ug/l
563-58-6 1,1-Dichloropropene ND 2.5 0.58 ug/l
10061-01-5 cis-1,3-Dichloropropene ND 1.0 0.51 ug/l
10061-02-6 trans-1,3-Dichloropropene ND 1.0 0.28 ug/l
108-20-3 Di-Isopropyl Ether 2.1 2.5 0.37 ug/l J
100-41-4 Ethylbenzene ND 2.5 1.0 ug/l
591-78-6 2-Hexanone ND 5.0 2.1 ug/l
87-68-3 Hexachlorobutadiene ND 1.0 0.55 ug/l
98-82-8 Isopropylbenzene ND 2.5 0.66 ug/l
99-87-6 p-Isopropyltoluene ND 2.5 0.65 ug/l
74-83-9 Methyl Bromide ND 2.5 1.1 ug/l
74-87-3 Methyl Chloride ND 2.5 0.33 ug/l
74-95-3 Methylene Bromide ND 2.5 0.57 ug/l
75-09-2 Methylene Chloride ND 2.5 0.40 ug/l
78-93-3 Methyl Ethyl Ketone ND 130 1.4 ug/l
108-10-1 4-Methyl-2-pentanone ND 2.5 1.2 ug/l
1634-04-4 Methyl Tert Butyl Ether 240 2.5 0.34 ug/l
91-20-3 Naphthalene ND 2.5 0.50 ug/l
103-65-1 n-Propylbenzene ND 2.5 1.1 ug/l
100-42-5 Styrene ND 2.5 0.63 ug/l
630-20-6 1,1,1,2-Tetrachloroethane ND 2.5 0.92 ug/l
79-34-5 1,1,2,2-Tetrachloroethane ND 1.0 0.62 ug/l
127-18-4 Tetrachloroethylene ND 2.5 1.1 ug/l
108-88-3 Toluene ND 2.5 1.5 ug/l
87-61-6 1,2,3-Trichlorobenzene ND 2.5 0.80 ug/l
120-82-1 1,2,4-Trichlorobenzene ND 2.5 0.85 ug/l
71-55-6 1,1,1-Trichloroethane ND 2.5 0.82 ug/l
79-00-5 1,1,2-Trichloroethane ND 1.5 0.87 ug/l
79-01-6 Trichloroethylene ND 2.5 0.90 ug/l
75-69-4 Trichlorofluoromethane ND 2.5 0.37 ug/l
96-18-4 1,2,3-Trichloropropane ND 2.5 0.11 ug/l
95-63-6 1,2,4-Trimethylbenzene ND 2.5 0.73 ug/l
108-67-8 1,3,5-Trimethylbenzene ND 2.5 0.81 ug/l
108-05-4 Vinyl Acetate ND 2.5 0.34 ug/l
75-01-4 Vinyl Chloride ND 0.50 0.38 ug/l
m,p-Xylene ND 5.0 1.7 ug/l
95-47-6 o-Xylene ND 2.5 0.74 ug/l
1330-20-7 Xylene (total)ND 2.5 0.81 ug/l
ND = Not detected MDL = Method Detection Limit J = Indicates an estimated value
RL = Reporting Limit B = Indicates analyte found in associated method blank
E = Indicates value exceeds calibration range N = Indicates presumptive evidence of a compound
16 of 41
LA8441633.4
SGS North America Inc.
Report of Analysis Page 3 of 3
Client Sample ID:GW13
Lab Sample ID:LA84416-4 Date Sampled:10/17/22
Matrix:AQ - Ground Water Date Received:10/19/22
Method:SM 6200B Percent Solids:n/a
Project:RM#2681, 3700 Groometown Rd, Greensboro, NC
VOA Special List
CAS No.Surrogate Recoveries Run# 1 Run# 2 Limits
17060-07-0 1,2-Dichloroethane-D4 102%70-130%
2037-26-5 Toluene-D8 101%70-130%
460-00-4 4-Bromofluorobenzene 98%70-130%
ND = Not detected MDL = Method Detection Limit J = Indicates an estimated value
RL = Reporting Limit B = Indicates analyte found in associated method blank
E = Indicates value exceeds calibration range N = Indicates presumptive evidence of a compound
17 of 41
LA8441633.4
SGS North America Inc.
Misc. Forms
Custody Documents and Other Forms
Includes the following where applicable:
• Chain of Custody
Scott, LA
Section 4
18 of 41
LA844164
LA84416: Chain of Custody
Page 1 of 4
19 of 41
LA8441644.1
LA84416: Chain of Custody
Page 2 of 4
20 of 41
LA8441644.1
Job Number:LA84416 Client:ATC
Date / Time Received:10/19/2022 10:00:00 AM Delivery Method:FEDEX
Project:RM #2681
4. No. Coolers:1
Airbill #'s:
Cooler Security
1. Custody Seals Present:
Y or N
2. Custody Seals Intact:
3. COC Present:
4. Smpl Dates/Time OK
2. Thermometer ID:
Cooler Temperature Y or N
1. Temp criteria achieved:
3. Cooler media:
IR002;
Ice (direct contact)
Quality Control Preservation Y or N N/A
1. Trip Blank present / cooler:
2. Trip Blank listed on COC:
3. Samples preserved properly:
4. VOCs headspace free:
Sample Integrity - Documentation Y or N
1. Sample labels present on bottles:
2. Container labeling complete:
3. Sample container label / COC agree:
Sample Integrity - Condition Y or N
1. Sample recvd within HT:
3. Condition of sample:
2. All containers accounted for:
Sample Integrity - Instructions
1. Analysis requested is clear:
2. Bottles received for unspecified tests
3. Sufficient volume recvd for analysis:
4. Compositing instructions clear:
5. Filtering instructions clear:
Intact
Y or N
Comments
Y or N N/A
Cooler Temps (Initial/Adjusted):#1: (0.4/0.2);
SGS Sample Receipt Summary
LA84416: Chain of Custody
Page 3 of 4
21 of 41
LA8441644.1
Page 2 of 2
Problem Resolution
CSR:Response Date:
Response:
Job Number:LA84416
LA84416: Chain of Custody
Page 4 of 4
22 of 41
LA8441644.1
SGS North America Inc.
MS Volatiles
QC Data Summaries
Includes the following where applicable:
• Method Blank Summaries
• Blank Spike Summaries
• Matrix Spike and Duplicate Summaries
Scott, LA
Section 5
23 of 41
LA844165
Method Blank Summary Page 1 of 3
Job Number:LA84416
Account:ATCNCR Atlas
Project:RM#2681, 3700 Groometown Rd, Greensboro, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
V2K4011-MB1 2K0144465.D 1 10/21/22 MB n/a n/a V2K4011
The QC reported here applies to the following samples:Method: SM 6200B
LA84416-1, LA84416-2, LA84416-3
CAS No.Compound Result RL MDL Units Q
67-64-1 Acetone ND 10 1.2 ug/l
107-13-1 Acrylonitrile ND 0.50 0.14 ug/l
71-43-2 Benzene ND 0.50 0.27 ug/l
108-86-1 Bromobenzene ND 0.50 0.18 ug/l
74-97-5 Bromochloromethane ND 0.50 0.12 ug/l
75-27-4 Bromodichloromethane ND 0.50 0.18 ug/l
75-25-2 Bromoform ND 0.50 0.10 ug/l
104-51-8 n-Butylbenzene ND 0.50 0.092 ug/l
135-98-8 sec-Butylbenzene ND 0.50 0.14 ug/l
98-06-6 tert-Butylbenzene ND 0.50 0.16 ug/l
75-15-0 Carbon Disulfide ND 0.50 0.14 ug/l
56-23-5 Carbon Tetrachloride ND 0.20 0.092 ug/l
108-90-7 Chlorobenzene ND 0.50 0.16 ug/l
75-00-3 Chloroethane ND 0.50 0.055 ug/l
67-66-3 Chloroform ND 0.50 0.094 ug/l
95-49-8 o-Chlorotoluene ND 0.50 0.16 ug/l
106-43-4 p-Chlorotoluene ND 0.50 0.20 ug/l
124-48-1 Dibromochloromethane ND 0.20 0.075 ug/l
96-12-8 1,2-Dibromo-3-chloropropane ND 0.50 0.13 ug/l
106-93-4 1,2-Dibromoethane ND 0.50 0.24 ug/l
75-71-8 Dichlorodifluoromethane ND 0.50 0.12 ug/l
541-73-1 m-Dichlorobenzene ND 0.50 0.063 ug/l
95-50-1 o-Dichlorobenzene ND 0.50 0.20 ug/l
106-46-7 p-Dichlorobenzene ND 0.50 0.22 ug/l
110-57-6 trans-1,4-Dichloro-2-Butene ND 0.50 0.27 ug/l
75-34-3 1,1-Dichloroethane ND 0.50 0.10 ug/l
107-06-2 1,2-Dichloroethane ND 0.20 0.12 ug/l
75-35-4 1,1-Dichloroethylene ND 0.50 0.094 ug/l
156-59-2 cis-1,2-Dichloroethylene ND 0.50 0.11 ug/l
156-60-5 trans-1,2-Dichloroethylene ND 0.50 0.15 ug/l
540-59-0 1,2-Dichloroethene (total)ND 0.50 0.17 ug/l
78-87-5 1,2-Dichloropropane ND 0.30 0.13 ug/l
142-28-9 1,3-Dichloropropane ND 0.50 0.21 ug/l
594-20-7 2,2-Dichloropropane ND 0.50 0.079 ug/l
563-58-6 1,1-Dichloropropene ND 0.50 0.12 ug/l
10061-01-5 cis-1,3-Dichloropropene ND 0.20 0.10 ug/l
24 of 41
LA8441655.1.1
Method Blank Summary Page 2 of 3
Job Number:LA84416
Account:ATCNCR Atlas
Project:RM#2681, 3700 Groometown Rd, Greensboro, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
V2K4011-MB1 2K0144465.D 1 10/21/22 MB n/a n/a V2K4011
The QC reported here applies to the following samples:Method: SM 6200B
LA84416-1, LA84416-2, LA84416-3
CAS No.Compound Result RL MDL Units Q
10061-02-6 trans-1,3-Dichloropropene ND 0.20 0.056 ug/l
108-20-3 Di-Isopropyl Ether ND 0.50 0.073 ug/l
100-41-4 Ethylbenzene ND 0.50 0.20 ug/l
591-78-6 2-Hexanone ND 1.0 0.42 ug/l
87-68-3 Hexachlorobutadiene ND 0.20 0.11 ug/l
98-82-8 Isopropylbenzene ND 0.50 0.13 ug/l
99-87-6 p-Isopropyltoluene ND 0.50 0.13 ug/l
74-83-9 Methyl Bromide ND 0.50 0.23 ug/l
74-87-3 Methyl Chloride ND 0.50 0.066 ug/l
74-95-3 Methylene Bromide ND 0.50 0.11 ug/l
75-09-2 Methylene Chloride ND 0.50 0.080 ug/l
78-93-3 Methyl Ethyl Ketone ND 25 0.28 ug/l
108-10-1 4-Methyl-2-pentanone ND 0.50 0.24 ug/l
1634-04-4 Methyl Tert Butyl Ether ND 0.50 0.068 ug/l
91-20-3 Naphthalene ND 0.50 0.10 ug/l
103-65-1 n-Propylbenzene ND 0.50 0.22 ug/l
100-42-5 Styrene ND 0.50 0.13 ug/l
630-20-6 1,1,1,2-Tetrachloroethane ND 0.50 0.18 ug/l
79-34-5 1,1,2,2-Tetrachloroethane ND 0.20 0.12 ug/l
127-18-4 Tetrachloroethylene ND 0.50 0.22 ug/l
108-88-3 Toluene ND 0.50 0.29 ug/l
87-61-6 1,2,3-Trichlorobenzene ND 0.50 0.16 ug/l
120-82-1 1,2,4-Trichlorobenzene ND 0.50 0.17 ug/l
71-55-6 1,1,1-Trichloroethane ND 0.50 0.16 ug/l
79-00-5 1,1,2-Trichloroethane ND 0.30 0.17 ug/l
79-01-6 Trichloroethylene ND 0.50 0.18 ug/l
75-69-4 Trichlorofluoromethane ND 0.50 0.073 ug/l
96-18-4 1,2,3-Trichloropropane ND 0.50 0.023 ug/l
95-63-6 1,2,4-Trimethylbenzene ND 0.50 0.15 ug/l
108-67-8 1,3,5-Trimethylbenzene ND 0.50 0.16 ug/l
108-05-4 Vinyl Acetate ND 0.50 0.069 ug/l
75-01-4 Vinyl Chloride ND 0.10 0.075 ug/l
m,p-Xylene ND 1.0 0.34 ug/l
95-47-6 o-Xylene ND 0.50 0.15 ug/l
1330-20-7 Xylene (total)ND 0.50 0.16 ug/l
25 of 41
LA8441655.1.1
Method Blank Summary Page 3 of 3
Job Number:LA84416
Account:ATCNCR Atlas
Project:RM#2681, 3700 Groometown Rd, Greensboro, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
V2K4011-MB1 2K0144465.D 1 10/21/22 MB n/a n/a V2K4011
The QC reported here applies to the following samples:Method: SM 6200B
LA84416-1, LA84416-2, LA84416-3
CAS No.Surrogate Recoveries Limits
17060-07-0 1,2-Dichloroethane-D4 92%70-130%
2037-26-5 Toluene-D8 98%70-130%
460-00-4 4-Bromofluorobenzene 93%70-130%
26 of 41
LA8441655.1.1
Method Blank Summary Page 1 of 3
Job Number:LA84416
Account:ATCNCR Atlas
Project:RM#2681, 3700 Groometown Rd, Greensboro, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
V2K4015-MB1 2K0144548.D 1 10/24/22 MB n/a n/a V2K4015
The QC reported here applies to the following samples:Method: SM 6200B
LA84416-4
CAS No.Compound Result RL MDL Units Q
67-64-1 Acetone 1.8 10 1.2 ug/l J
107-13-1 Acrylonitrile ND 0.50 0.14 ug/l
71-43-2 Benzene ND 0.50 0.27 ug/l
108-86-1 Bromobenzene ND 0.50 0.18 ug/l
74-97-5 Bromochloromethane ND 0.50 0.12 ug/l
75-27-4 Bromodichloromethane ND 0.50 0.18 ug/l
75-25-2 Bromoform ND 0.50 0.10 ug/l
104-51-8 n-Butylbenzene ND 0.50 0.092 ug/l
135-98-8 sec-Butylbenzene ND 0.50 0.14 ug/l
98-06-6 tert-Butylbenzene ND 0.50 0.16 ug/l
75-15-0 Carbon Disulfide ND 0.50 0.14 ug/l
56-23-5 Carbon Tetrachloride ND 0.20 0.092 ug/l
108-90-7 Chlorobenzene ND 0.50 0.16 ug/l
75-00-3 Chloroethane ND 0.50 0.055 ug/l
67-66-3 Chloroform ND 0.50 0.094 ug/l
95-49-8 o-Chlorotoluene ND 0.50 0.16 ug/l
106-43-4 p-Chlorotoluene ND 0.50 0.20 ug/l
124-48-1 Dibromochloromethane ND 0.20 0.075 ug/l
96-12-8 1,2-Dibromo-3-chloropropane ND 0.50 0.13 ug/l
106-93-4 1,2-Dibromoethane ND 0.50 0.24 ug/l
75-71-8 Dichlorodifluoromethane ND 0.50 0.12 ug/l
541-73-1 m-Dichlorobenzene ND 0.50 0.063 ug/l
95-50-1 o-Dichlorobenzene ND 0.50 0.20 ug/l
106-46-7 p-Dichlorobenzene ND 0.50 0.22 ug/l
110-57-6 trans-1,4-Dichloro-2-Butene ND 0.50 0.27 ug/l
75-34-3 1,1-Dichloroethane ND 0.50 0.10 ug/l
107-06-2 1,2-Dichloroethane ND 0.20 0.12 ug/l
75-35-4 1,1-Dichloroethylene ND 0.50 0.094 ug/l
156-59-2 cis-1,2-Dichloroethylene ND 0.50 0.11 ug/l
156-60-5 trans-1,2-Dichloroethylene ND 0.50 0.15 ug/l
540-59-0 1,2-Dichloroethene (total)ND 0.50 0.17 ug/l
78-87-5 1,2-Dichloropropane ND 0.30 0.13 ug/l
142-28-9 1,3-Dichloropropane ND 0.50 0.21 ug/l
594-20-7 2,2-Dichloropropane ND 0.50 0.079 ug/l
563-58-6 1,1-Dichloropropene ND 0.50 0.12 ug/l
10061-01-5 cis-1,3-Dichloropropene ND 0.20 0.10 ug/l
27 of 41
LA8441655.1.2
Method Blank Summary Page 2 of 3
Job Number:LA84416
Account:ATCNCR Atlas
Project:RM#2681, 3700 Groometown Rd, Greensboro, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
V2K4015-MB1 2K0144548.D 1 10/24/22 MB n/a n/a V2K4015
The QC reported here applies to the following samples:Method: SM 6200B
LA84416-4
CAS No.Compound Result RL MDL Units Q
10061-02-6 trans-1,3-Dichloropropene ND 0.20 0.056 ug/l
108-20-3 Di-Isopropyl Ether ND 0.50 0.073 ug/l
100-41-4 Ethylbenzene ND 0.50 0.20 ug/l
591-78-6 2-Hexanone ND 1.0 0.42 ug/l
87-68-3 Hexachlorobutadiene ND 0.20 0.11 ug/l
98-82-8 Isopropylbenzene ND 0.50 0.13 ug/l
99-87-6 p-Isopropyltoluene ND 0.50 0.13 ug/l
74-83-9 Methyl Bromide ND 0.50 0.23 ug/l
74-87-3 Methyl Chloride ND 0.50 0.066 ug/l
74-95-3 Methylene Bromide ND 0.50 0.11 ug/l
75-09-2 Methylene Chloride ND 0.50 0.080 ug/l
78-93-3 Methyl Ethyl Ketone ND 25 0.28 ug/l
108-10-1 4-Methyl-2-pentanone ND 0.50 0.24 ug/l
1634-04-4 Methyl Tert Butyl Ether ND 0.50 0.068 ug/l
91-20-3 Naphthalene 0.25 0.50 0.10 ug/l J
103-65-1 n-Propylbenzene ND 0.50 0.22 ug/l
100-42-5 Styrene ND 0.50 0.13 ug/l
630-20-6 1,1,1,2-Tetrachloroethane ND 0.50 0.18 ug/l
79-34-5 1,1,2,2-Tetrachloroethane ND 0.20 0.12 ug/l
127-18-4 Tetrachloroethylene ND 0.50 0.22 ug/l
108-88-3 Toluene ND 0.50 0.29 ug/l
87-61-6 1,2,3-Trichlorobenzene 0.31 0.50 0.16 ug/l J
120-82-1 1,2,4-Trichlorobenzene ND 0.50 0.17 ug/l
71-55-6 1,1,1-Trichloroethane ND 0.50 0.16 ug/l
79-00-5 1,1,2-Trichloroethane ND 0.30 0.17 ug/l
79-01-6 Trichloroethylene ND 0.50 0.18 ug/l
75-69-4 Trichlorofluoromethane ND 0.50 0.073 ug/l
96-18-4 1,2,3-Trichloropropane ND 0.50 0.023 ug/l
95-63-6 1,2,4-Trimethylbenzene ND 0.50 0.15 ug/l
108-67-8 1,3,5-Trimethylbenzene ND 0.50 0.16 ug/l
108-05-4 Vinyl Acetate ND 0.50 0.069 ug/l
75-01-4 Vinyl Chloride ND 0.10 0.075 ug/l
m,p-Xylene ND 1.0 0.34 ug/l
95-47-6 o-Xylene ND 0.50 0.15 ug/l
1330-20-7 Xylene (total)ND 0.50 0.16 ug/l
28 of 41
LA8441655.1.2
Method Blank Summary Page 3 of 3
Job Number:LA84416
Account:ATCNCR Atlas
Project:RM#2681, 3700 Groometown Rd, Greensboro, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
V2K4015-MB1 2K0144548.D 1 10/24/22 MB n/a n/a V2K4015
The QC reported here applies to the following samples:Method: SM 6200B
LA84416-4
CAS No.Surrogate Recoveries Limits
17060-07-0 1,2-Dichloroethane-D4 104%70-130%
2037-26-5 Toluene-D8 104%70-130%
460-00-4 4-Bromofluorobenzene 99%70-130%
29 of 41
LA8441655.1.2
Blank Spike/Blank Spike Duplicate Summary Page 1 of 3
Job Number:LA84416
Account:ATCNCR Atlas
Project:RM#2681, 3700 Groometown Rd, Greensboro, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
V2K4011-BS1 2K0144462.D 1 10/21/22 MB n/a n/a V2K4011
V2K4011-BSD1 2K0144463.D 1 10/21/22 MB n/a n/a V2K4011
The QC reported here applies to the following samples:Method: SM 6200B
LA84416-1, LA84416-2, LA84416-3
Spike BSP BSP BSD BSD Limits
CAS No.Compound ug/l ug/l %ug/l %RPD Rec/RPD
67-64-1 Acetone 50 76.8 154*71.2 142*8 70-130/30
107-13-1 Acrylonitrile 20 20.0 100 15.7 79 24 70-130/30
71-43-2 Benzene 20 18.5 93 19.1 96 3 70-130/30
108-86-1 Bromobenzene 20 26.0 130 25.0 125 4 70-130/30
74-97-5 Bromochloromethane 20 17.2 86 17.5 88 2 70-130/30
75-27-4 Bromodichloromethane 20 23.1 116 22.4 112 3 70-130/30
75-25-2 Bromoform 20 21.1 106 21.4 107 1 70-130/30
104-51-8 n-Butylbenzene 20 23.1 116 21.9 110 5 70-130/30
135-98-8 sec-Butylbenzene 20 23.2 116 21.7 109 7 70-130/30
98-06-6 tert-Butylbenzene 20 22.1 111 21.0 105 5 70-130/30
75-15-0 Carbon Disulfide 20 22.6 113 22.5 113 0 70-130/30
56-23-5 Carbon Tetrachloride 20 19.1 96 19.9 100 4 70-130/30
108-90-7 Chlorobenzene 20 21.3 107 21.0 105 1 70-130/30
75-00-3 Chloroethane 20 19.9 100 20.1 101 1 60-140/30
67-66-3 Chloroform 20 17.4 87 18.0 90 3 70-130/30
95-49-8 o-Chlorotoluene 20 21.4 107 20.7 104 3 70-130/30
106-43-4 p-Chlorotoluene 20 21.2 106 20.1 101 5 70-130/30
124-48-1 Dibromochloromethane 20 25.0 125 24.7 124 1 70-130/30
96-12-8 1,2-Dibromo-3-chloropropane 20 18.7 94 20.7 104 10 70-130/30
106-93-4 1,2-Dibromoethane 20 23.2 116 23.7 119 2 70-130/30
75-71-8 Dichlorodifluoromethane 20 18.2 91 18.4 92 1 60-140/30
541-73-1 m-Dichlorobenzene 20 21.9 110 20.9 105 5 70-130/30
95-50-1 o-Dichlorobenzene 20 21.6 108 20.8 104 4 70-130/30
106-46-7 p-Dichlorobenzene 20 21.6 108 20.3 102 6 70-130/30
110-57-6 trans-1,4-Dichloro-2-Butene 20 18.5 93 19.0 95 3 70-130/30
75-34-3 1,1-Dichloroethane 20 19.4 97 19.1 96 2 70-130/30
107-06-2 1,2-Dichloroethane 20 19.7 99 20.7 104 5 70-130/30
75-35-4 1,1-Dichloroethylene 20 19.5 98 19.3 97 1 70-130/30
156-59-2 cis-1,2-Dichloroethylene 20 18.2 91 18.6 93 2 70-130/30
156-60-5 trans-1,2-Dichloroethylene 20 18.3 92 18.3 92 0 70-130/30
540-59-0 1,2-Dichloroethene (total)40 36.5 91 36.9 92 1 70-130/30
78-87-5 1,2-Dichloropropane 20 18.9 95 19.8 99 5 70-130/30
142-28-9 1,3-Dichloropropane 20 20.3 102 20.1 101 1 70-130/30
594-20-7 2,2-Dichloropropane 20 18.5 93 19.1 96 3 70-130/30
563-58-6 1,1-Dichloropropene 20 18.1 91 18.5 93 2 70-130/30
10061-01-5 cis-1,3-Dichloropropene 20 21.4 107 21.5 108 0 70-130/30
* = Outside of Control Limits.
30 of 41
LA8441655.2.1
Blank Spike/Blank Spike Duplicate Summary Page 2 of 3
Job Number:LA84416
Account:ATCNCR Atlas
Project:RM#2681, 3700 Groometown Rd, Greensboro, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
V2K4011-BS1 2K0144462.D 1 10/21/22 MB n/a n/a V2K4011
V2K4011-BSD1 2K0144463.D 1 10/21/22 MB n/a n/a V2K4011
The QC reported here applies to the following samples:Method: SM 6200B
LA84416-1, LA84416-2, LA84416-3
Spike BSP BSP BSD BSD Limits
CAS No.Compound ug/l ug/l %ug/l %RPD Rec/RPD
10061-02-6 trans-1,3-Dichloropropene 20 23.5 118 23.1 116 2 70-130/30
108-20-3 Di-Isopropyl Ether 20 18.6 93 19.4 97 4 70-130/30
100-41-4 Ethylbenzene 20 21.1 106 21.1 106 0 70-130/30
591-78-6 2-Hexanone 50 61.7 123 66.5 133*7 70-130/30
87-68-3 Hexachlorobutadiene 20 23.8 119 23.0 115 3 70-130/30
98-82-8 Isopropylbenzene 20 23.4 117 23.6 118 1 70-130/30
99-87-6 p-Isopropyltoluene 20 22.5 113 21.5 108 5 70-130/30
74-83-9 Methyl Bromide 20 22.7 114 24.7 124 8 60-140/30
74-87-3 Methyl Chloride 20 15.4 77 16.1 81 4 60-140/30
74-95-3 Methylene Bromide 20 20.9 105 21.7 109 4 70-130/30
75-09-2 Methylene Chloride 20 18.4 92 18.8 94 2 70-130/30
78-93-3 Methyl Ethyl Ketone 50 44.4 89 45.0 90 1 70-130/30
108-10-1 4-Methyl-2-pentanone 50 49.6 99 48.1 96 3 70-130/30
1634-04-4 Methyl Tert Butyl Ether 20 16.7 84 17.1 86 2 70-130/30
91-20-3 Naphthalene 20 19.3 97 18.9 95 2 70-130/30
103-65-1 n-Propylbenzene 20 23.3 117 22.0 110 6 70-130/30
100-42-5 Styrene 20 24.0 120 24.0 120 0 70-130/30
630-20-6 1,1,1,2-Tetrachloroethane 20 23.9 120 23.5 118 2 70-130/30
79-34-5 1,1,2,2-Tetrachloroethane 20 20.1 101 19.5 98 3 70-130/30
127-18-4 Tetrachloroethylene 20 24.4 122 24.7 124 1 70-130/30
108-88-3 Toluene 20 20.4 102 21.2 106 4 70-130/30
87-61-6 1,2,3-Trichlorobenzene 20 27.0 135*26.1 131*3 70-130/30
120-82-1 1,2,4-Trichlorobenzene 20 22.8 114 22.2 111 3 70-130/30
71-55-6 1,1,1-Trichloroethane 20 20.3 102 20.6 103 1 70-130/30
79-00-5 1,1,2-Trichloroethane 20 21.3 107 21.7 109 2 70-130/30
79-01-6 Trichloroethylene 20 21.0 105 20.9 105 0 70-130/30
75-69-4 Trichlorofluoromethane 20 18.8 94 19.1 96 2 60-140/30
96-18-4 1,2,3-Trichloropropane 20 21.7 109 20.5 103 6 70-130/30
95-63-6 1,2,4-Trimethylbenzene 20 22.7 114 21.6 108 5 70-130/30
108-67-8 1,3,5-Trimethylbenzene 20 21.7 109 20.5 103 6 70-130/30
108-05-4 Vinyl Acetate 20 20.6 103 21.1 106 2 70-130/30
75-01-4 Vinyl Chloride 20 16.0 80 16.2 81 1 60-140/30
m,p-Xylene 40 47.5 119 46.8 117 1 70-130/30
95-47-6 o-Xylene 20 22.7 114 22.7 114 0 70-130/30
1330-20-7 Xylene (total)60 70.3 117 69.5 116 1 70-130/30
* = Outside of Control Limits.
31 of 41
LA8441655.2.1
Blank Spike/Blank Spike Duplicate Summary Page 3 of 3
Job Number:LA84416
Account:ATCNCR Atlas
Project:RM#2681, 3700 Groometown Rd, Greensboro, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
V2K4011-BS1 2K0144462.D 1 10/21/22 MB n/a n/a V2K4011
V2K4011-BSD1 2K0144463.D 1 10/21/22 MB n/a n/a V2K4011
The QC reported here applies to the following samples:Method: SM 6200B
LA84416-1, LA84416-2, LA84416-3
CAS No.Surrogate Recoveries BSP BSD Limits
17060-07-0 1,2-Dichloroethane-D4 96%94%70-130%
2037-26-5 Toluene-D8 96%99%70-130%
460-00-4 4-Bromofluorobenzene 99%99%70-130%
* = Outside of Control Limits.
32 of 41
LA8441655.2.1
Blank Spike/Blank Spike Duplicate Summary Page 1 of 3
Job Number:LA84416
Account:ATCNCR Atlas
Project:RM#2681, 3700 Groometown Rd, Greensboro, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
V2K4015-BS1 2K0144545A.D1 10/24/22 MB n/a n/a V2K4015
V2K4015-BSD1 2K0144546.D 1 10/24/22 MB n/a n/a V2K4015
The QC reported here applies to the following samples:Method: SM 6200B
LA84416-4
Spike BSP BSP BSD BSD Limits
CAS No.Compound ug/l ug/l %ug/l %RPD Rec/RPD
67-64-1 Acetone 50 49.3 99 69.5 139* a 34* a 70-130/30
107-13-1 Acrylonitrile 20 17.1 86 19.9 100 15 70-130/30
71-43-2 Benzene 20 18.9 95 18.8 94 1 70-130/30
108-86-1 Bromobenzene 20 19.9 100 20.2 101 1 70-130/30
74-97-5 Bromochloromethane 20 17.6 88 18.8 94 7 70-130/30
75-27-4 Bromodichloromethane 20 21.5 108 22.1 111 3 70-130/30
75-25-2 Bromoform 20 20.0 100 20.2 101 1 70-130/30
104-51-8 n-Butylbenzene 20 22.6 113 23.8 119 5 70-130/30
135-98-8 sec-Butylbenzene 20 21.2 106 21.9 110 3 70-130/30
98-06-6 tert-Butylbenzene 20 20.6 103 21.6 108 5 70-130/30
75-15-0 Carbon Disulfide 20 21.6 108 21.2 106 2 70-130/30
56-23-5 Carbon Tetrachloride 20 20.0 100 20.1 101 0 70-130/30
108-90-7 Chlorobenzene 20 20.0 100 19.9 100 1 70-130/30
75-00-3 Chloroethane 20 19.0 95 18.7 94 2 60-140/30
67-66-3 Chloroform 20 19.0 95 19.1 96 1 70-130/30
95-49-8 o-Chlorotoluene 20 20.1 101 20.7 104 3 70-130/30
106-43-4 p-Chlorotoluene 20 20.7 104 21.6 108 4 70-130/30
124-48-1 Dibromochloromethane 20 23.1 116 23.1 116 0 70-130/30
96-12-8 1,2-Dibromo-3-chloropropane 20 18.7 94 21.0 105 12 70-130/30
106-93-4 1,2-Dibromoethane 20 21.1 106 22.1 111 5 70-130/30
75-71-8 Dichlorodifluoromethane 20 19.6 98 19.5 98 1 60-140/30
541-73-1 m-Dichlorobenzene 20 19.2 96 20.0 100 4 70-130/30
95-50-1 o-Dichlorobenzene 20 18.9 95 20.7 104 9 70-130/30
106-46-7 p-Dichlorobenzene 20 18.2 91 18.9 95 4 70-130/30
110-57-6 trans-1,4-Dichloro-2-Butene 20 17.7 89 23.4 117 28 70-130/30
75-34-3 1,1-Dichloroethane 20 20.0 100 19.4 97 3 70-130/30
107-06-2 1,2-Dichloroethane 20 21.2 106 21.8 109 3 70-130/30
75-35-4 1,1-Dichloroethylene 20 18.5 93 18.4 92 1 70-130/30
156-59-2 cis-1,2-Dichloroethylene 20 18.5 93 18.6 93 1 70-130/30
156-60-5 trans-1,2-Dichloroethylene 20 18.6 93 18.1 91 3 70-130/30
540-59-0 1,2-Dichloroethene (total)40 37.1 93 36.7 92 1 70-130/30
78-87-5 1,2-Dichloropropane 20 20.0 100 20.6 103 3 70-130/30
142-28-9 1,3-Dichloropropane 20 20.3 102 20.9 105 3 70-130/30
594-20-7 2,2-Dichloropropane 20 20.0 100 19.7 99 2 70-130/30
563-58-6 1,1-Dichloropropene 20 19.4 97 19.5 98 1 70-130/30
10061-01-5 cis-1,3-Dichloropropene 20 20.7 104 21.1 106 2 70-130/30
* = Outside of Control Limits.
33 of 41
LA8441655.2.2
Blank Spike/Blank Spike Duplicate Summary Page 2 of 3
Job Number:LA84416
Account:ATCNCR Atlas
Project:RM#2681, 3700 Groometown Rd, Greensboro, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
V2K4015-BS1 2K0144545A.D1 10/24/22 MB n/a n/a V2K4015
V2K4015-BSD1 2K0144546.D 1 10/24/22 MB n/a n/a V2K4015
The QC reported here applies to the following samples:Method: SM 6200B
LA84416-4
Spike BSP BSP BSD BSD Limits
CAS No.Compound ug/l ug/l %ug/l %RPD Rec/RPD
10061-02-6 trans-1,3-Dichloropropene 20 20.4 102 21.0 105 3 70-130/30
108-20-3 Di-Isopropyl Ether 20 20.4 102 21.1 106 3 70-130/30
100-41-4 Ethylbenzene 20 19.8 99 20.1 101 2 70-130/30
591-78-6 2-Hexanone 50 57.0 114 60.4 121 6 70-130/30
87-68-3 Hexachlorobutadiene 20 20.1 101 20.2 101 0 70-130/30
98-82-8 Isopropylbenzene 20 20.6 103 20.8 104 1 70-130/30
99-87-6 p-Isopropyltoluene 20 21.3 107 22.1 111 4 70-130/30
74-83-9 Methyl Bromide 20 22.0 110 21.5 108 2 60-140/30
74-87-3 Methyl Chloride 20 21.2 106 20.6 103 3 60-140/30
74-95-3 Methylene Bromide 20 19.9 100 20.2 101 1 70-130/30
75-09-2 Methylene Chloride 20 17.8 89 17.5 88 2 70-130/30
78-93-3 Methyl Ethyl Ketone 50 50.0 100 51.8 104 4 70-130/30
108-10-1 4-Methyl-2-pentanone 50 53.2 106 55.1 110 4 70-130/30
1634-04-4 Methyl Tert Butyl Ether 20 19.7 99 20.1 101 2 70-130/30
91-20-3 Naphthalene 20 23.8 119 26.0 130 9 70-130/30
103-65-1 n-Propylbenzene 20 20.2 101 21.5 108 6 70-130/30
100-42-5 Styrene 20 22.4 112 22.8 114 2 70-130/30
630-20-6 1,1,1,2-Tetrachloroethane 20 21.0 105 21.0 105 0 70-130/30
79-34-5 1,1,2,2-Tetrachloroethane 20 18.2 91 20.4 102 11 70-130/30
127-18-4 Tetrachloroethylene 20 19.6 98 20.1 101 3 70-130/30
108-88-3 Toluene 20 18.6 93 19.2 96 3 70-130/30
87-61-6 1,2,3-Trichlorobenzene 20 21.1 106 22.7 114 7 70-130/30
120-82-1 1,2,4-Trichlorobenzene 20 20.6 103 21.7 109 5 70-130/30
71-55-6 1,1,1-Trichloroethane 20 20.2 101 20.7 104 2 70-130/30
79-00-5 1,1,2-Trichloroethane 20 20.0 100 21.1 106 5 70-130/30
79-01-6 Trichloroethylene 20 19.0 95 19.2 96 1 70-130/30
75-69-4 Trichlorofluoromethane 20 18.6 93 18.0 90 3 60-140/30
96-18-4 1,2,3-Trichloropropane 20 19.2 96 20.0 100 4 70-130/30
95-63-6 1,2,4-Trimethylbenzene 20 21.2 106 22.2 111 5 70-130/30
108-67-8 1,3,5-Trimethylbenzene 20 21.8 109 22.6 113 4 70-130/30
108-05-4 Vinyl Acetate 20 20.2 101 20.7 104 2 70-130/30
75-01-4 Vinyl Chloride 20 17.9 90 17.9 90 0 60-140/30
m,p-Xylene 40 43.4 109 44.1 110 2 70-130/30
95-47-6 o-Xylene 20 20.8 104 20.5 103 1 70-130/30
1330-20-7 Xylene (total)60 64.2 107 64.6 108 1 70-130/30
* = Outside of Control Limits.
34 of 41
LA8441655.2.2
Blank Spike/Blank Spike Duplicate Summary Page 3 of 3
Job Number:LA84416
Account:ATCNCR Atlas
Project:RM#2681, 3700 Groometown Rd, Greensboro, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
V2K4015-BS1 2K0144545A.D1 10/24/22 MB n/a n/a V2K4015
V2K4015-BSD1 2K0144546.D 1 10/24/22 MB n/a n/a V2K4015
The QC reported here applies to the following samples:Method: SM 6200B
LA84416-4
CAS No.Surrogate Recoveries BSP BSD Limits
17060-07-0 1,2-Dichloroethane-D4 102%99%70-130%
2037-26-5 Toluene-D8 103%103%70-130%
460-00-4 4-Bromofluorobenzene 104%99%70-130%
(a) Outside control limits biased high. Analyte not detected in associated samples.
* = Outside of Control Limits.
35 of 41
LA8441655.2.2
Matrix Spike/Matrix Spike Duplicate Summary Page 1 of 3
Job Number:LA84416
Account:ATCNCR Atlas
Project:RM#2681, 3700 Groometown Rd, Greensboro, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
LA84026-6MS 2K0144482.D 20 10/21/22 MB n/a n/a V2K4011
LA84026-6MSD 2K0144483.D 20 10/21/22 MB n/a n/a V2K4011
LA84026-6 a 2K0144468.D 10 10/21/22 MB n/a n/a V2K4011
The QC reported here applies to the following samples:Method: SM 6200B
LA84416-1, LA84416-2, LA84416-3
LA84026-6 Spike MS MS Spike MSD MSD Limits
CAS No.Compound ug/l Q ug/l ug/l %ug/l ug/l %RPD Rec/RPD
67-64-1 Acetone 328 1000 1270 94 1000 1340 101 5 70-130/20
107-13-1 Acrylonitrile ND 400 384 96 400 296 74 26*70-130/20
71-43-2 Benzene ND 400 364 91 400 365 91 0 70-130/20
108-86-1 Bromobenzene ND 400 475 119 400 447 112 6 70-130/20
74-97-5 Bromochloromethane ND 400 312 78 400 323 81 3 70-130/20
75-27-4 Bromodichloromethane ND 400 426 107 400 433 108 2 70-130/20
75-25-2 Bromoform ND 400 375 94 400 392 98 4 70-130/20
104-51-8 n-Butylbenzene ND 400 395 99 400 385 96 3 70-130/20
135-98-8 sec-Butylbenzene ND 400 430 108 400 412 103 4 70-130/20
98-06-6 tert-Butylbenzene ND 400 438 110 400 430 108 2 70-130/20
75-15-0 Carbon Disulfide ND 400 401 100 400 418 105 4 70-130/20
56-23-5 Carbon Tetrachloride ND 400 346 87 400 358 90 3 70-130/20
108-90-7 Chlorobenzene ND 400 393 98 400 382 96 3 70-130/20
75-00-3 Chloroethane ND 400 387 97 400 385 96 1 60-140/20
67-66-3 Chloroform ND 400 325 81 400 330 83 2 70-130/20
95-49-8 o-Chlorotoluene ND 400 392 98 400 392 98 0 70-130/20
106-43-4 p-Chlorotoluene ND 400 393 98 400 390 98 1 70-130/20
124-48-1 Dibromochloromethane ND 400 449 112 400 452 113 1 70-130/20
96-12-8 1,2-Dibromo-3-chloropropane ND 400 350 88 400 330 83 6 70-130/20
106-93-4 1,2-Dibromoethane ND 400 435 109 400 425 106 2 70-130/20
75-71-8 Dichlorodifluoromethane ND 400 331 83 400 346 87 4 60-140/20
541-73-1 m-Dichlorobenzene ND 400 409 102 400 395 99 3 70-130/20
95-50-1 o-Dichlorobenzene ND 400 407 102 400 406 102 0 70-130/20
106-46-7 p-Dichlorobenzene ND 400 405 101 400 403 101 0 70-130/20
110-57-6 trans-1,4-Dichloro-2-Butene ND 400 220 55*400 261 65*17 70-130/20
75-34-3 1,1-Dichloroethane ND 400 352 88 400 361 90 3 70-130/20
107-06-2 1,2-Dichloroethane ND 400 394 99 400 402 101 2 70-130/20
75-35-4 1,1-Dichloroethylene ND 400 378 95 400 379 95 0 70-130/20
156-59-2 cis-1,2-Dichloroethylene ND 400 339 85 400 351 88 3 70-130/20
156-60-5 trans-1,2-Dichloroethylene ND 400 731 183*400 687 172*6 70-130/20
540-59-0 1,2-Dichloroethene (total)ND 800 1070 134*800 1040 130 3 70-130/20
78-87-5 1,2-Dichloropropane ND 400 373 93 400 388 97 4 70-130/20
142-28-9 1,3-Dichloropropane ND 400 394 99 400 366 92 7 70-130/20
594-20-7 2,2-Dichloropropane ND 400 296 74 400 313 78 6 70-130/20
563-58-6 1,1-Dichloropropene ND 400 335 84 400 341 85 2 70-130/20
10061-01-5 cis-1,3-Dichloropropene ND 400 387 97 400 405 101 5 70-130/20
* = Outside of Control Limits.
36 of 41
LA8441655.3.1
Matrix Spike/Matrix Spike Duplicate Summary Page 2 of 3
Job Number:LA84416
Account:ATCNCR Atlas
Project:RM#2681, 3700 Groometown Rd, Greensboro, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
LA84026-6MS 2K0144482.D 20 10/21/22 MB n/a n/a V2K4011
LA84026-6MSD 2K0144483.D 20 10/21/22 MB n/a n/a V2K4011
LA84026-6 a 2K0144468.D 10 10/21/22 MB n/a n/a V2K4011
The QC reported here applies to the following samples:Method: SM 6200B
LA84416-1, LA84416-2, LA84416-3
LA84026-6 Spike MS MS Spike MSD MSD Limits
CAS No.Compound ug/l Q ug/l ug/l %ug/l ug/l %RPD Rec/RPD
10061-02-6 trans-1,3-Dichloropropene ND 400 397 99 400 398 100 0 70-130/20
108-20-3 Di-Isopropyl Ether ND 400 351 88 400 360 90 3 70-130/20
100-41-4 Ethylbenzene ND 400 395 99 400 380 95 4 70-130/20
591-78-6 2-Hexanone ND 1000 837 84 1000 912 91 9 70-130/20
87-68-3 Hexachlorobutadiene ND 400 406 102 400 395 99 3 70-130/20
98-82-8 Isopropylbenzene ND 400 436 109 400 416 104 5 70-130/20
99-87-6 p-Isopropyltoluene ND 400 417 104 400 399 100 4 70-130/20
74-83-9 Methyl Bromide ND 400 369 92 400 445 111 19 60-140/20
74-87-3 Methyl Chloride ND 400 290 73 400 306 77 5 60-140/20
74-95-3 Methylene Bromide ND 400 393 98 400 401 100 2 70-130/20
75-09-2 Methylene Chloride ND 400 344 86 400 357 89 4 70-130/20
78-93-3 Methyl Ethyl Ketone ND 1000 581 58*1000 645 65*10 70-130/20
108-10-1 4-Methyl-2-pentanone ND 1000 941 94 1000 871 87 8 70-130/20
1634-04-4 Methyl Tert Butyl Ether ND 400 309 77 400 316 79 2 70-130/20
91-20-3 Naphthalene ND 400 350 88 400 357 89 2 70-130/20
103-65-1 n-Propylbenzene ND 400 428 107 400 409 102 5 70-130/20
100-42-5 Styrene ND 400 445 111 400 435 109 2 70-130/20
630-20-6 1,1,1,2-Tetrachloroethane ND 400 456 114 400 435 109 5 70-130/20
79-34-5 1,1,2,2-Tetrachloroethane ND 400 380 95 400 380 95 0 70-130/20
127-18-4 Tetrachloroethylene ND 400 365 91 400 350 88 4 70-130/20
108-88-3 Toluene ND 400 403 101 400 378 95 6 70-130/20
87-61-6 1,2,3-Trichlorobenzene ND 400 487 122 400 481 120 1 70-130/20
120-82-1 1,2,4-Trichlorobenzene ND 400 407 102 400 406 102 0 70-130/20
71-55-6 1,1,1-Trichloroethane ND 400 370 93 400 366 92 1 70-130/20
79-00-5 1,1,2-Trichloroethane ND 400 404 101 400 374 94 8 70-130/20
79-01-6 Trichloroethylene ND 400 383 96 400 405 101 6 70-130/20
75-69-4 Trichlorofluoromethane ND 400 366 92 400 381 95 4 60-140/20
96-18-4 1,2,3-Trichloropropane ND 400 394 99 400 381 95 3 70-130/20
95-63-6 1,2,4-Trimethylbenzene ND 400 424 106 400 410 103 3 70-130/20
108-67-8 1,3,5-Trimethylbenzene ND 400 398 100 400 391 98 2 70-130/20
108-05-4 Vinyl Acetate ND 400 411 103 400 405 101 1 70-130/20
75-01-4 Vinyl Chloride ND 400 304 76 400 332 83 9 60-140/20
m,p-Xylene ND 800 895 112 800 849 106 5 70-130/20
95-47-6 o-Xylene 1.8 J 400 422 105 400 400 100 5 70-130/20
1330-20-7 Xylene (total)4.8 J 1200 1320 110 1200 1250 104 5 70-130/20
* = Outside of Control Limits.
37 of 41
LA8441655.3.1
Matrix Spike/Matrix Spike Duplicate Summary Page 3 of 3
Job Number:LA84416
Account:ATCNCR Atlas
Project:RM#2681, 3700 Groometown Rd, Greensboro, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
LA84026-6MS 2K0144482.D 20 10/21/22 MB n/a n/a V2K4011
LA84026-6MSD 2K0144483.D 20 10/21/22 MB n/a n/a V2K4011
LA84026-6 a 2K0144468.D 10 10/21/22 MB n/a n/a V2K4011
The QC reported here applies to the following samples:Method: SM 6200B
LA84416-1, LA84416-2, LA84416-3
CAS No.Surrogate Recoveries MS MSD LA84026-6 Limits
17060-07-0 1,2-Dichloroethane-D4 88%90%92%70-130%
2037-26-5 Toluene-D8 97%102%98%70-130%
460-00-4 4-Bromofluorobenzene 93%91%89%70-130%
(a) Initial analysis within holding time. Reanalysis for required dilution was past holding time.
* = Outside of Control Limits.
38 of 41
LA8441655.3.1
Matrix Spike/Matrix Spike Duplicate Summary Page 1 of 3
Job Number:LA84416
Account:ATCNCR Atlas
Project:RM#2681, 3700 Groometown Rd, Greensboro, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
LA84174-1MS 2K0144564.D 20 10/25/22 MB n/a n/a V2K4015
LA84174-1MSD 2K0144565.D 20 10/25/22 MB n/a n/a V2K4015
LA84174-1 2K0144550.D 10 10/24/22 MB n/a n/a V2K4015
The QC reported here applies to the following samples:Method: SM 6200B
LA84416-4
LA84174-1 Spike MS MS Spike MSD MSD Limits
CAS No.Compound ug/l Q ug/l ug/l %ug/l ug/l %RPD Rec/RPD
67-64-1 Acetone 36.9 J 1000 953 92 1000 884 85 8 70-130/20
107-13-1 Acrylonitrile ND 400 394 99 400 370 93 6 70-130/20
71-43-2 Benzene 998 400 1400 101 400 1440 111 3 70-130/20
108-86-1 Bromobenzene ND 400 395 99 400 403 101 2 70-130/20
74-97-5 Bromochloromethane ND 400 378 95 400 354 89 7 70-130/20
75-27-4 Bromodichloromethane ND 400 456 114 400 432 108 5 70-130/20
75-25-2 Bromoform ND 400 364 91 400 381 95 5 70-130/20
104-51-8 n-Butylbenzene 11.1 400 389 94 400 418 102 7 70-130/20
135-98-8 sec-Butylbenzene 8.6 400 409 100 400 437 107 7 70-130/20
98-06-6 tert-Butylbenzene ND 400 427 107 400 458 115 7 70-130/20
75-15-0 Carbon Disulfide ND 400 419 105 400 437 109 4 70-130/20
56-23-5 Carbon Tetrachloride ND 400 402 101 400 418 105 4 70-130/20
108-90-7 Chlorobenzene ND 400 400 100 400 406 102 1 70-130/20
75-00-3 Chloroethane ND 400 422 106 400 435 109 3 60-140/20
67-66-3 Chloroform ND 400 387 97 400 386 97 0 70-130/20
95-49-8 o-Chlorotoluene ND 400 379 95 400 410 103 8 70-130/20
106-43-4 p-Chlorotoluene ND 400 387 97 400 407 102 5 70-130/20
124-48-1 Dibromochloromethane ND 400 444 111 400 449 112 1 70-130/20
96-12-8 1,2-Dibromo-3-chloropropane ND 400 345 86 400 393 98 13 70-130/20
106-93-4 1,2-Dibromoethane ND 400 434 109 400 444 111 2 70-130/20
75-71-8 Dichlorodifluoromethane ND 400 485 121 400 495 124 2 60-140/20
541-73-1 m-Dichlorobenzene ND 400 361 90 400 382 96 6 70-130/20
95-50-1 o-Dichlorobenzene ND 400 362 91 400 396 99 9 70-130/20
106-46-7 p-Dichlorobenzene ND 400 339 85 400 361 90 6 70-130/20
110-57-6 trans-1,4-Dichloro-2-Butene ND 400 226 57* a 400 254 64* a 12 70-130/20
75-34-3 1,1-Dichloroethane ND 400 392 98 400 400 100 2 70-130/20
107-06-2 1,2-Dichloroethane ND 400 449 112 400 433 108 4 70-130/20
75-35-4 1,1-Dichloroethylene ND 400 389 97 400 402 101 3 70-130/20
156-59-2 cis-1,2-Dichloroethylene ND 400 371 93 400 381 95 3 70-130/20
156-60-5 trans-1,2-Dichloroethylene ND 400 392 98 400 361 90 8 70-130/20
540-59-0 1,2-Dichloroethene (total)ND 800 763 95 800 741 93 3 70-130/20
78-87-5 1,2-Dichloropropane ND 400 429 107 400 434 109 1 70-130/20
142-28-9 1,3-Dichloropropane ND 400 422 106 400 400 100 5 70-130/20
594-20-7 2,2-Dichloropropane ND 400 267 67* a 400 273 68* a 2 70-130/20
563-58-6 1,1-Dichloropropene ND 400 387 97 400 392 98 1 70-130/20
10061-01-5 cis-1,3-Dichloropropene ND 400 380 95 400 387 97 2 70-130/20
* = Outside of Control Limits.
39 of 41
LA8441655.3.2
Matrix Spike/Matrix Spike Duplicate Summary Page 2 of 3
Job Number:LA84416
Account:ATCNCR Atlas
Project:RM#2681, 3700 Groometown Rd, Greensboro, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
LA84174-1MS 2K0144564.D 20 10/25/22 MB n/a n/a V2K4015
LA84174-1MSD 2K0144565.D 20 10/25/22 MB n/a n/a V2K4015
LA84174-1 2K0144550.D 10 10/24/22 MB n/a n/a V2K4015
The QC reported here applies to the following samples:Method: SM 6200B
LA84416-4
LA84174-1 Spike MS MS Spike MSD MSD Limits
CAS No.Compound ug/l Q ug/l ug/l %ug/l ug/l %RPD Rec/RPD
10061-02-6 trans-1,3-Dichloropropene ND 400 369 92 400 365 91 1 70-130/20
108-20-3 Di-Isopropyl Ether 4.4 J 400 426 105 400 424 105 0 70-130/20
100-41-4 Ethylbenzene 127 400 532 101 400 550 106 3 70-130/20
591-78-6 2-Hexanone ND 1000 929 93 1000 1060 106 13 70-130/20
87-68-3 Hexachlorobutadiene ND 400 344 86 400 368 92 7 70-130/20
98-82-8 Isopropylbenzene 63.4 400 476 103 400 487 106 2 70-130/20
99-87-6 p-Isopropyltoluene ND 400 395 99 400 420 105 6 70-130/20
74-83-9 Methyl Bromide ND 400 389 97 400 434 109 11 60-140/20
74-87-3 Methyl Chloride ND 400 475 119 400 481 120 1 60-140/20
74-95-3 Methylene Bromide ND 400 399 100 400 402 101 1 70-130/20
75-09-2 Methylene Chloride ND 400 382 96 400 385 96 1 70-130/20
78-93-3 Methyl Ethyl Ketone ND 1000 828 83 1000 861 86 4 70-130/20
108-10-1 4-Methyl-2-pentanone ND 1000 1080 108 1000 1040 104 4 70-130/20
1634-04-4 Methyl Tert Butyl Ether 32.9 400 415 96 400 416 96 0 70-130/20
91-20-3 Naphthalene 43.1 400 519 119 400 538 124 4 70-130/20
103-65-1 n-Propylbenzene 175 400 551 94 400 605 108 9 70-130/20
100-42-5 Styrene ND 400 439 110 400 449 112 2 70-130/20
630-20-6 1,1,1,2-Tetrachloroethane ND 400 421 105 400 422 106 0 70-130/20
79-34-5 1,1,2,2-Tetrachloroethane ND 400 372 93 400 382 96 3 70-130/20
127-18-4 Tetrachloroethylene ND 400 280 70 400 287 72 2 70-130/20
108-88-3 Toluene 10.0 400 385 94 400 398 97 3 70-130/20
87-61-6 1,2,3-Trichlorobenzene ND 400 392 98 400 439 110 11 70-130/20
120-82-1 1,2,4-Trichlorobenzene ND 400 384 96 400 403 101 5 70-130/20
71-55-6 1,1,1-Trichloroethane ND 400 404 101 400 410 103 1 70-130/20
79-00-5 1,1,2-Trichloroethane ND 400 423 106 400 405 101 4 70-130/20
79-01-6 Trichloroethylene ND 400 373 93 400 395 99 6 70-130/20
75-69-4 Trichlorofluoromethane ND 400 403 101 400 408 102 1 60-140/20
96-18-4 1,2,3-Trichloropropane ND 400 347 87 400 350 88 1 70-130/20
95-63-6 1,2,4-Trimethylbenzene 7.1 400 415 102 400 445 109 7 70-130/20
108-67-8 1,3,5-Trimethylbenzene 2.1 J 400 413 103 400 455 113 10 70-130/20
108-05-4 Vinyl Acetate ND 400 435 109 400 427 107 2 70-130/20
75-01-4 Vinyl Chloride ND 400 427 107 400 419 105 2 60-140/20
m,p-Xylene 15.1 800 878 108 800 891 109 1 70-130/20
95-47-6 o-Xylene ND 400 412 103 400 413 103 0 70-130/20
1330-20-7 Xylene (total)15.1 1200 1290 106 1200 1300 107 1 70-130/20
* = Outside of Control Limits.
40 of 41
LA8441655.3.2
Matrix Spike/Matrix Spike Duplicate Summary Page 3 of 3
Job Number:LA84416
Account:ATCNCR Atlas
Project:RM#2681, 3700 Groometown Rd, Greensboro, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
LA84174-1MS 2K0144564.D 20 10/25/22 MB n/a n/a V2K4015
LA84174-1MSD 2K0144565.D 20 10/25/22 MB n/a n/a V2K4015
LA84174-1 2K0144550.D 10 10/24/22 MB n/a n/a V2K4015
The QC reported here applies to the following samples:Method: SM 6200B
LA84416-4
CAS No.Surrogate Recoveries MS MSD LA84174-1 Limits
17060-07-0 1,2-Dichloroethane-D4 97%93%93%70-130%
2037-26-5 Toluene-D8 99%100%108%70-130%
460-00-4 4-Bromofluorobenzene 100%102%105%70-130%
(a) Outside control limits due to matrix interference. Blank Spike meets acceptance criteria.
* = Outside of Control Limits.
41 of 41
LA8441655.3.2
Circle K Store #7930 (RM #2681)
November 17, 2022

ATC Project No. P662681991 Phillips 66 Company

APPENDIX C

CONTAMINANT MASS VS TIME

APPENDIX C
CONTAMINANT MASS REMOVAL VS TIME
CIRCLE K STORE NO. 7930 (RM NO. 2681)
3700 GROOMETOWN ROAD
GREENSBORO, NORTH CAROLINA
ATC PROJECT NO. P662681021
2014 2015 2016 2017 2018 Mar-19 Jun-19 Sep-19 Dec-19 Mar-20 Jun-20 Sep-20 Dec-20 Jun-21 Jan-22 Apr-22 Jul-22 Oct-22
MTBE 147.9 15.1 6.9 10.8 0.9 0.8 0.0 0.1 0.3 0.2 0.051 0.032 0.099 0.012 0.215 0.212 0.125 0.166
BENZENE 1.1 0.024 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0006 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
0.0
20.0
40.0
60.0
80.0
100.0
120.0
140.0
160.0
MASS (kg)YEAR
Page 1 of 1
Circle K Store #7930 (RM #2681)
November 17, 2022

ATC Project No. P662681991 Phillips 66 Company

APPENDIX D

GSI MANN-KENDALL TOOLKITS

Evaluation Date:Job ID:
Facility Name:Constituent:
Conducted By:Concentration Units:μg/L
Sampling Point ID:GW-8 GW-13
Sampling Sampling
Event Date
1 1/14/2022 50.3 260
2 4/21/2022 8.1 306
3 7/20/2022 0.25 180
4 10/17/2022 0.93 240
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Coefficient of Variation:1.60 0.21
Mann-Kendall Statistic (S):-4 -2
Confidence Factor:83.3%62.5%
Concentration Trend:No Trend Stable
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.
MTBE CONCENTRATION (μg/L)
GSI Environmental Inc., www.gsi-net.com
GSI MANN-KENDALL TOOLKIT
for Constituent Trend Analysis
15-Dec-22 RM 2681
Former Circle K Store #7930 (RM 2681)MTBE
ATC Associates of North Carolina, P.C.
0.1
1
10
100
1000
12/21 02/22 03/22 05/22 07/22 08/22 10/22 12/22Concentration (μg/L)Sampling Date
GW-8
GW-13
Circle K Store #7930 (RM #2681)
November 17, 2022

ATC Project No. P662681991 Phillips 66 Company
APPENDIX E

NCDEQ RISK CALCULATOR

Version Date:
Basis:
Site Name:
Site Address:
DEQ Section:
Site ID:
Exposure Unit ID:
Submittal Date:
Reviewed By:
Exposure Unit #1
North Carolina Department of Environmental Quality
Risk Calculator
Circle K Store No. 7930 (RM No. 2681)
3700 Groometown Road, Greensboro, Guilford County, NC
UST Section
NCDEQ Incident #15707
July 2022
May 2022 EPA RSL Table
1/10/2022
Prepared By:ATC Associates of North Carolina, P.C.
2725 E. Millbrook Road, Suite 121, Raleigh, North Carolina 27604
NCDEQ UST Section
North Carolina DEQ Risk Calculator
Table of Contents
Version Date: July 2022
Basis: May 2022 EPA RSL Table
Site ID: NCDEQ Incident #15707
Exposure Unit ID: Exposure Unit #1
Form No.
Input Form 1A Complete Exposure Pathways
Input Form 1B Exposure Factors and Target Risks
Input Form 1C Contaminant Migration Parameters
Input Form 1D Sample Statistics
Input Form 2A Soil Exposure Point Concentration Table
Input Form 2B Groundwater Exposure Point Concentration Table
Input Form 2C Surface Water Exposure Point Concentration Table
Input Form 2D Soil Gas Exposure Point Concentration Table
Input Form 2E Indoor Air Exposure Point Concentration Table
Output Form 1A Risk for Individual Pathways
Output Form 1B Sitewide Risk
Output Form 2A Resident Soil
Output Form 2B Resident Groundwater Use
Output Form 2C Non-Residential Worker Soil
Output Form 2D Non-Residential Worker Groundwater Use
Output Form 2E Construction Worker Soil
Output Form 2F Recreator/Trespasser Soil
Output Form 2G Recreator/Trespasser Surface Water
Output Form 3A Resident Groundwater to Indoor Air
Output Form 3B Resident Soil Gas to Indoor Air
Output Form 3C Resident Indoor Air
Output Form 3D Non-Residential Worker Groundwater to Indoor Air
Output Form 3E Non-Residential Worker Soil Gas to Indoor Air
Output Form 3F Non-Residential Worker Indoor Air
Output Form 4A Soil to Groundwater - Forward Mode
Output Form 4B Groundwater to Groundwater - Forward Mode
Output Form 4C Soil to Surface Water - Forward Mode
Output Form 4D Groundwater to Surface Water - Forward Mode
Output Form 4E Soil to Groundwater - Backward Mode
Output Form 4F Groundwater to Groundwater - Backward Mode
Output Form 4G Soil to Surface Water - Backward Mode
Output Form 4H Groundwater to Surface Water - Backward Mode
Output Section 4 - Contaminant Migration Worksheets
Output Section 3 - Vapor Intrusion Calculators
TOC
Description
DATA INPUT SHEETS
Check box
if included
Input Section 1 - Exposure Pathways & Parameters
Input Section 2 - Exposure Point Concentrations
DATA OUTPUT SHEETS
Output Section 1 - Summary Output for All Calculators
Output Section 2 - Direct Contact Soil and Groundwater Calculators
North Carolina DEQ Risk Calculator
Complete Exposure Pathways
Version Date: July 2022
Basis: May 2022 EPA RSL Table
Site ID: NCDEQ Incident #15707
Exposure Unit ID: Exposure Unit #1
Note: Risk output will only be calculated for complete exposure pathways.
Receptor Pathway
Check box if
pathway
complete
Soil
Groundwater Use
Soil
Groundwater Use
Construction Worker Soil
Soil
Surface Water
Groundwater to Indoor Air
Soil Gas to Indoor Air
Indoor Air
Groundwater to Indoor Air
Soil Gas to Indoor Air
Indoor Air
Source Soil
Source Groundwater
Source Soil
Source Groundwater
Resident
Non-Residential Worker
CONTAMINANT MIGRATION PATHWAYS
Groundwater
Surface Water
Input Form 1A
VAPOR INTRUSION PATHWAYS
DIRECT CONTACT SOIL AND WATER PATHWAYS
Resident
Non-Residential Worker
Recreator/Trespasser
North Carolina DEQ Risk Calculator
Exposure Factors and Target Risks
Version Date: July 2022
Basis: May 2022 EPA RSL Table
Site ID: NCDEQ Incident #15707
Exposure Parameter Site Specific Value Justification
Target Cancer Risk (individual)1.0E-06
Target Cancer Risk (cumulative)1.0E-04
Target Hazard Index (individual)2.0E-01
Target Hazard Index (cumulative)1.0E+00
Lifetime (LT) (years)70
Body Weight (BW) (kg)15
Exposure Duration (ED) (yr)6
Exposure Frequency (EF) (d/yr)350
Exposure Time (ET) (hr/d)24
Skin Surface Area - Soil Exposure (SAs) (cm2)2373
Soil Adherence Factor (AF) (mg/cm2)0.2
Soil Ingestion Rate (IRS) (mg/day)200
Skin Surface Area - Water Exposure (SAw) (cm2)6365
Water Ingestion Rate (IRW) (L/d)0.78
Water Exposure Time (ETevent) (hr/event)0.54
Water Event Frequency (EV) (events/day)1
Lifetime (LT) (years)70
Body Weight (BW) (kg)80
Exposure Duration (ED) (yr)20
Exposure Frequency (EF) (d/yr)350
Exposure Time (ET) (hr/d)24
Skin Surface Area - Soil Exposure (SAs) (cm2)6032
Soil Adherence Factor (AF) (mg/cm2)0.07
Soil Ingestion Rate (IRS) (mg/day)100
Skin Surface Area - Water Exposure (SAw) (cm2)19652
Water Ingestion Rate (IRW) (L/d)2.5
Water Exposure Time (ETevent) (hr/event)0.71
Water Event Frequency (EV) (events/day)1
Lifetime (LT) (years)70
Body Weight (BW) (kg)80
Exposure Duration (ED) (yr)25
Exposure Frequency (EF) (d/yr)250
Exposure Time (ET) (hr/d)8
Skin Surface Area - Soil Exposure (SAs) (cm2)3527
Soil Adherence Factor (AF) (mg/cm2)0.12
Soil Ingestion Rate (IR) (mg/day)100
Skin Surface Area - Water Exposure (SAw) (cm2)19652
Water Ingestion Rate (IRW) (L/d)0.83
Water Exposure Time (ETevent) (hr/event)0.67
Water Event Frequency (EV) (events/day)1
Lifetime (LT) (years)70
Body Weight (BW) (kg)80
Working Weeks (EW) (wk/yr)50
Exposure Duration (ED) (yr)1
Exposure Frequency (EF) (d/yr)250
Exposure Time (ET) (hr/d)8
Skin Surface Area - Soil Exposure (SAs) (cm2)3527
Soil Adherence Factor (AF) (mg/cm2)0.3
Soil Ingestion Rate (IR) (mg/day)330
Non-Residential Worker
Construction Worker
70
80
25
250
8
3527
0.12
100
19652
0.83
0.67
Input Form 1B
Exposure Unit ID: Exposure Unit #1
Residential Child
General
Residential Adult
Default Value
1.0E-06
1.0E-04
2.0E-01
1.0E+00
70
15
6
350
24
2373
0.2
200
6365
0.78
0.54
1
70
80
20
350
24
6032
0.07
100
19652
2.5
0.71
1
1
70
80
330
1
250
8
3527
0.3
50
North Carolina DEQ Risk Calculator
Exposure Factors and Target Risks
Version Date: July 2022
Basis: May 2022 EPA RSL Table
Site ID: NCDEQ Incident #15707
Exposure Parameter Site Specific Value Justification
Input Form 1B
Exposure Unit ID: Exposure Unit #1
Default Value
Recreator Trespasser
Lifetime (LT) (years)70 NA 70
Averaging Time (AT) (days/yr)365 NA 365
Body Weight (BW) (kg)15 NA 15
Exposure Duration 0-2 (ED) (yr)2 NA 2
Exposure Duration 2-6 (ED) (yr)4 NA 4
Exposure Frequency (EF) (d/yr)195 NA 195
Exposure Time (ET) (hr/d)2 NA 2
Skin Surface Area - Soil Exposure (SAs) (cm2)2373 NA 2373
Soil Adherence Factor (AF) (mg/cm2)0.2 NA 0.2
Soil Ingestion Rate (IRS) (mg/day)200 NA 200
Skin Surface Area - Water Exposure (SAw) (cm2)6365 NA 6365
Water Ingestion Rate (IRW) (L/hr)0.12 NA 0.12
Water Exposure Time (ETevent) (hr/event)2 NA 2
Water Event Frequency (EV) (events/day)1 NA 1
Recreator Trespasser
Lifetime (LT) (years)70 70 70
Body Weight (BW) (kg)80 45 80
Exposure Duration 6-16 (ED) (yr)10 10 10
Exposure Duration 16-26 (ED) (yr)10 0 10
Exposure Frequency (EF) (d/yr)195 90 195
Exposure Time (ET) (hr/d)2 2 2
Skin Surface Area - Soil Exposure (SAs) (cm2)6032 6032 6032
Soil Adherence Factor (AF) (mg/cm2)0.07 0.2 0.07
Soil Ingestion Rate (IRS) (mg/day)100 200 100
Skin Surface Area - Water Exposure (SAw) (cm2)19652 19652 19652
Water Ingestion Rate (IRW) (L/hr)0.11 0.11 0.11
Water Exposure Time (ETevent) (hr/event)2 2 2
Water Event Frequency (EV) (events/day)1 1 1
User Defined Child
User Defined Adult
North Carolina DEQ Risk Calculator
Contaminant Migration Parameters

Version Date: July 2022
Basis: May 2022 EPA RSL Table
Site ID: NCDEQ Incident #15707
Exposure Unit ID: Exposure Unit #1
Parameter Default Value Site Specific
Value Justification
Distance to Protection of
Groundwater Point of
Exposure (POEgw) (feet)
0 786 ATC used the distance from the groundwater source area to the nearest
downgradient potable water supply well, PW-4217.
Distance to Protection of
Surface Water Point of
Exposure (POEsw) (feet)
0
Depth to Base of Affected
Soils (ds) (cm)1244
Length of Affected Soil
Parallel to Assumed GW Flow
Direction (L) (cm)
Site-specific
value required
Areal extent of soil
contamination
range 0.5-500 (As) (acres)
0.5
Fraction of vegetative cover
(V) (unitless)0.5
0.15 (soil to
outdoor air
pathway)
0.3 (soil to
groundwater
pathway)
Provide justification for the contaminant migration parameters used.
Water Filled Soil Porosity
(θw) (unitless)
Input Form 1C
North Carolina DEQ Risk Calculator
Contaminant Migration Parameters

Version Date: July 2022
Basis: May 2022 EPA RSL Table
Site ID: NCDEQ Incident #15707
Exposure Unit ID: Exposure Unit #1
Parameter Default Value Site Specific
Value Justification
Provide justification for the contaminant migration parameters used.
Input Form 1C
0.28 (soil to
outdoor air
pathway)
0.13 (soil to
groundwater
pathway)
Total Soil Porosity (n)
(unitless)0.43
Dry Soil Bulk Density (ρb)
(g/cm3)1.5
Net Infiltration Rate (I)
(cm/yr)66
0.006 (soil to
outdoor air
pathway)
0.002 (soil
leaching to
groundwater
pathway)
Aquifer Hydraulic
Conductivity (K) (cm/d)
Site-specific
value required
Hydraulic Gradient (i)
(unitless)
Site-specific
value required
Fraction Organic Carbon
(foc) (unitless)
Air Filled Soil Porosity (θa)
(unitless)
North Carolina DEQ Risk Calculator
Contaminant Migration Parameters

Version Date: July 2022
Basis: May 2022 EPA RSL Table
Site ID: NCDEQ Incident #15707
Exposure Unit ID: Exposure Unit #1
Parameter Default Value Site Specific
Value Justification
Provide justification for the contaminant migration parameters used.
Input Form 1C
Average Groundwater
Temperature (Tgw) (°C)25
Aquifer Thickness (da) (cm)Site-specific
value required
Groundwater Source
Thickness (Sd) (cm)
Site-specific
value required 921
Since deep well GW-02 has consistently indicated no detections above
2L Standard, ATC is subtracting the average depth to groundwater in
source well GW-13 (24.79 feet, 755.60 cm) from the depth of the top of
the well screen in GW-02 (55 feet, 1676.4 cm), to determine a
conservative value for source thickness.
Groundwater Source Width
(Sw) (cm)
Site-specific
value required 1,189 The groundwater source width is approximately 39 feet (1,188.72 cm).
Plume Thickness at GW/SW
Discharge (δsw) (cm)
Site-specific
value required
Plume Width at GW/SW
Discharge (Wgwsw) (cm)
Site-specific
value required
Surface Water Flowrate at
GW/SW Discharge (Qsw)
(cm3/d)
Site-specific
value required
North Carolina DEQ Risk Calculator
Exposure Point Concentrations
Version Date: July 2022
Basis: May 2022 EPA RSL Table
Site ID: NCDEQ Incident #15707
Exposure Unit ID: Exposure Unit #1
Description of Exposure Point Concentration Selection:
NOTE: If the chemical list is changed from a prior calculator run, remember to select "See All Chemicals" on the data output sheet or newly added chemicals will not be included in risk calculations
Exposure Point
Concentration
(ug/L)
Notes:CAS Number Chemical
Minimum
Concentration
(Qualifier)
Maximum
Concentration
(Qualifier)
Units
0.81 See Table 9 104-51-8 Butylbenzene, n-0.81 0.81 ug/L
0.21 See Table 9 98-82-8 Cumene 0.21 0.21 ug/L
3.7 See Table 9 108-20-3 Diisopropyl Ether 2 3.7 ug/L
306 See Table 9 1634-04-4 Methyl tert-Butyl Ether (MTBE)180 306 ug/L
1.2 See Table 9 108-05-4 Vinyl Acetate 1.2 1.2 ug/L
Input Form 2B
Groundwater Exposure Point Concentration Table
Data for the monitoring well with the highest groundwater concentrations after remediation system shutdown were used for determining the exposure point concentrations.
North Carolina DEQ Risk Calculator
Risk for Individual Pathways Output Form 1A
Version Date: July 2022
Basis: May 2022 EPA RSL Table
Site ID: NCDEQ Incident #15707
Exposure Unit ID: Exposure Unit #1
Receptor Pathway Carcinogenic
Risk Hazard Index Risk exceeded?
Soil NC NC NC
Groundwater Use*NC NC NC
Soil NC NC NC
Groundwater Use*NC NC NC
Construction Worker Soil NC NC NC
Soil NC NC NC
Surface Water*NC NC NC
Receptor Pathway Carcinogenic
Risk Hazard Index Risk exceeded?
Groundwater to Indoor Air NC NC NC
Soil Gas to Indoor Air NC NC NC
Indoor Air NC NC NC
Groundwater to Indoor Air NC NC NC
Soil Gas to Indoor Air NC NC NC
Indoor Air NC NC NC
Pathway Source
Source Soil NC
Source Groundwater NO
Source Soil NC
Source Groundwater NC
3. NM = Not Modeled
4. NC = Pathway not calculated
2. * = If concentrations in groundwater exceed the NC 2L Standards or IMAC, or concentrations in surface water exceed the
NC 2B Standards, appropriate remediation and/or institutional control measures will be necessary to be eligible for a risk-based
closure.
Surface Water Exceedence of 2B at Receptor?
Exceedence of 2B at Receptor?
VAPOR INTRUSION CALCULATORS
Resident
Non-Residential Worker
CONTAMINANT MIGRATION CALCULATORS
Target Receptor Concentrations Exceeded?
Groundwater Exceedence of 2L at Receptor?
Exceedence of 2L at Receptor?
1. If lead concentrations were entered in the exposure point concentration tables, see the individual calculator sheets for lead
concentrations in comparison to screening levels. Note that lead is not included in cumulative risk calculations.
Notes:
DIRECT CONTACT SOIL AND WATER CALCULATORS
Resident
Non-Residential Worker
Recreator/Trespasser
North Carolina DEQ Risk Calculator
Output Form 4B
Version Date: July 2022
Basis: May 2022 EPA RSL Table
Site ID: NCDEQ Incident #15707
Distance to Groundwater Receptor 786 feet
CAS #Chemical Name:
Source
Groundwater
Concentration
(ug/L)
2L Standard
(μg/L)
Groundwater
Concentration
at Receptor
(μg/L)
Concentration
Exceeds 2L
Standard?
104-51-8 Butylbenzene, n-0.81 70 1.9E-02 NO
98-82-8 Cumene 0.21 70 4.8E-03 NO
108-20-3 Diisopropyl Ether 3.7 70 8.5E-02 NO
1634-04-4 Methyl tert-Butyl Ether (MTBE)306 20 7.0E+00 NO
108-05-4 Vinyl Acetate 1.2 88 2.8E-02 NO
Notes: This is a 1-D model and should be used as a screening tool.
NM= Not modeled because contaminant migration parameters have not been entered.
DEQ Risk Calculator - Contaminant Migration - Groundwater to Groundwater - Forward Mode
North Carolina DEQ Risk Calculator