WS-8952_44219_CA_MRP_20210511

Speedway LLC

Speedway Office
500 Speedway Drive
Enon, OH 45323
Telephone [phone]
May 11, 2021

Delivered via electronic mail to [e-mail]

Mr. Gene Mao
Guilford County Department of Health
Health and Environmental Risk Assessment
1203 Maple Street
Greensboro, North Carolina 27405

Re: Monitored Natural Attenuation Report No. 10
Former Wilco No. 154 (Speedway No. 6953)
3030 North Main Street
High Point, Guilford County, North Carolina
NCDEQ Incident No. 44219
NCDEQ Priority Ranking: Intermediate

Dear Mr. Mao:

Speedway LLC (Speedway) is pleased to provide the attached Monitored Natural Attenuation Report No.
10 for the referenced site. The services outlined in this report were performed by our consultant, ATC
Associates of North Carolina, P.C. (ATC), in accordance with Task Authorization No. 44219-14, which was
approved on February 9, 2021.

During the March 4, 2021, selective groundwater monitoring events, groundwater samples were collected
from monitoring wells MW-01, MW-02, MW-03, MW-05, and MW-06. Benzene concentrations were
detected greater than its North Carolina Gross Contaminant Level (GCL) in the groundwater sample
collected from monitoring well MW-01.

As recommended in the site’s Corrective Action Plan dated July 8, 2015, semi-annual groundwater
monitoring activities will continue with the next event scheduled for mid-August 2021 after an approved
PATA for the monitoring is received.

If you have any questions or require additional information, please contact me at 919-516-8069 or by
email at [e-mail]

Sincerely,
Speedway LLC

Charles A. Chiara
Environmental Representative

Attachment

cc: ATC Associates of North Carolina, P.C., 7606 Whitehall Executive Center Drive, Suite 800, Charlotte, NC 28273

Monitored Natural Attenuation Report No. 10

Prepared for:

Speedway LLC

May 11, 2021
Former Wilco No. 154
(Speedway No. 6953)
3030 North Main Street
High Point, Guilford County, North Carolina
NCDEQ Incident No. 44219
NCDEQ Priority Ranking: Intermediate
ATC Project No. SWDP695307

Monitored Natural Attenuation Report No. 10
Former Wilco No. 154 (Speedway No. 6953)
May 11, 2021 ATC Group Services LLC ii
Document Information
Prepared for Speedway LLC
Project Name Former Wilco No. 154 (Speedway No. 6953)
File Reference SW 6953_May 2021_MNA Report No. 10
Job Reference SWDP695307
Date May 11, 2021
Contact Information
ATC Associates of North Carolina, P.C.
7606 Whitehall Executive Center Drive, Suite 800
Charlotte, North Carolina 28273
Telephone: [phone]
Facsimile: 704.529.3272
www.atcassociates.com
Document Control
Version Date Author Author
Initials
Reviewer Reviewer
Initials
Draft 04-28-21 Carter Paradis CCP DT Hurdle DTH
Final 05-11-21 Carter Paradis CCP Bob Bolton BB

Donald T. Hurdle, PG (NC No. 1908)

Carter C. Paradis
Project Manager Staff Scientist
for ATC Group Services LLC for ATC Group Services LLC
Direct Line +1 757.467.2100 Office Line +1 919.871.0999
Email: [e-mail]

Bob Bolton
Senior Project Manager
For ATC Group Services LLC
Direct Line +1 803.223.0793
Email: [e-mail]
Email: [e-mail]

Monitored Natural Attenuation Report No. 10
Former Wilco No. 154 (Speedway No. 6953)
May 11, 2021 ATC Group Services LLC iii
Executive Summary
ATC Associates of North Carolina, P.C., on behalf of Speedway LLC (Speedway), conducted selective
groundwater monitoring activities at the Former Wilco No. 154 (Speedway No. 6953) on March 4, 2021, as
approved by the North Carolina Department of Environmental Quality (NCDEQ) with Task Authorization No.
44219-14.
During the selective groundwater monitoring event, groundwater samples were collected from monitoring wells
MW-01, MW-02, MW-03, MW-05, and MW-06. A concentration of benzene was detected greater than its North
Carolina Gross Contaminant Level (GCL) in the groundwater sample collected from monitoring well MW-01.
The chemicals of concern appear to be decreasing over time. Semi-annual monitoring should continue. Once the
selective groundwater monitoring event yields results below gross contamination levels, ATC will conduct a final
comprehensive monitoring event. Should the results of the comprehensive monitoring event be less than GCLs,
ATC will request site closure with a Notice of Residual Petroleum.

Monitored Natural Attenuation Report No. 10
Former Wilco No. 154 (Speedway No. 6953)
May 11, 2021 ATC Group Services LLC iv
Table of Contents
Executive Summary iii
1 Introduction 1
1.1 Site Background 1
1.2 Current Activities 1
2 Groundwater Sample Collection and Analysis 2
3 Results 3
3.1 Site Geology / Hydrogeology 3
3.2 Groundwater Analytical Results 3
4 Findings and Conclusions 4
5 Recommendations 5
6 Report Limitations 6
Tables
TABLE 1 UST System Information
TABLE 2 Summary of Recent Groundwater Elevation Measurements
TABLE 3 Summary of Historical Groundwater Elevation Measurements
TABLE 4 Well Development, Purge, and Sample Record
TABLE 5 Summary of Recent Groundwater Analytical Results
TABLE 6 Summary of Historical Groundwater Analytical Results
TABLE 7 Summary of Natural Attenuation Groundwater Analytical Results
Figures
FIGURE 1 Site Location Map
FIGURE 2 Site Map
FIGURE 3 Groundwater Elevation Contour Map
FIGURE 4 Petroleum Constituents in Groundwater Map
Appendices
APPENDIX A Approved NCDEQ Task Authorization No. 44219-13
APPENDIX B Laboratory Analytical Report for Groundwater
APPENDIX C Chemical Concentrations in Groundwater vs Time
Monitored Natural Attenuation Report No. 10
Former Wilco No. 154 (Speedway No. 6953)
May 11, 2021 ATC Group Services LLC 1
1 Introduction
Speedway LLC (Speedway) contracted ATC Associates of North Carolina, P.C. (ATC) to perform selective
groundwater monitoring activities at the Former Wilco No. 154 (Speedway No. 6953), located at 3030 North Main
Street, High Point, Guilford County, North Carolina. Figure 1 shows the location of the site on part of a United
States Geological Survey (USGS) topographic map. The site is currently a used car facility. Figure 2 depicts the
site layout including the location of relevant site features.
1.1 Site Background
In August 2013, five steel underground storage tanks (USTs) were removed from the site. UST system information
is summarized in Table 1. Four 8,000-gallon gasoline USTs were located in a single UST basin, and the 8,000-
gallon diesel UST was located in a separate UST basin. All USTs were eight feet in diameter and 24 feet in length.
No historical releases or compliance issues are known prior to this incident.
Petroleum-impacted soil identified during removal of the UST system prompted submittal of a release report to
county and state regulatory agencies. Subsequently, Soil Investigation, Limited Site Assessment (LSA), and
Comprehensive Site Assessments (CSAs) activities were conducted at the site.
After reviewing the April 2015, CSA report, the Guilford County Department of Public Health and Environmental
Risk Assessment (HERA) team requested a Corrective Action Plan (CAP) be prepared for the site to evaluate
strategies that would reduce the petroleum constituent concentrations below the Gross Contaminant Levels
(GCLs) for groundwater. The North Carolina Department of Environmental Quality (NCDEQ) (formerly North
Carolina Department of Environmental and Natural Resources) issued a Notice of Regulatory Requirement
(NORR) on May 14, 2015, for the CAP. Speedway’s previous consultant, Simon & Associates, Inc., prepared the
CAP and submitted it to the HERA and NCDEQ on July 8, 2015. On August 10, 2015, NCDEQ issued a NORR
approving the CAP that recommended quarterly monitored natural attenuation (MNA) activities be performed at
the site. These activities included monitoring and sampling of the eight monitoring wells to determine if the
dissolved phase petroleum constituent concentrations will naturally attenuate over time. The initial Monitored
Natural Attenuation Quarterly Report was submitted on November 30, 2015, and subsequent quarterly reports
were submitted.
1.2 Current Activities
On February 9, 2021, the NCDEQ issued Task Authorization No. 44219-14 for selective groundwater monitoring
activities to be conducted at the site. The task authorization associated with these activities is attached as
Appendix A.

Monitored Natural Attenuation Report No. 10
Former Wilco No. 154 (Speedway No. 6953)
May 11, 2021 ATC Group Services LLC 2
2 Groundwater Sample Collection and Analysis
On March 4, 2021, groundwater samples were collected from monitoring wells MW-01, MW-02, MW-03, MW-05,
and MW-06. Gauging of these monitoring wells and the site’s remaining monitoring wells was performed using an
oil/water interface probe prior to collecting groundwater samples. Recent groundwater elevation measurements
are summarized in Table 2, and historical groundwater elevation measurements are summarized in Table 3.
During the event, free product was not detected. Water quality information is summarized in Table 4.
The groundwater samples were collected in laboratory-supplied containers, entered into chain-of-custody control,
placed on ice, and shipped to Pace Laboratories [12065 Lebanon Road, Mt. Juliet, Tennessee 37122, North
Carolina Laboratory Certification Number ENV375/DW21704/BI0041, [phone]] for benzene, toluene,
ethylbenzene, total xylenes (BTEX), methyl tert-butyl ether (MTBE), naphthalene, 1,2-dichloroethane (1,2-DCA),
and isopropyl ether (IPE) analysis by Environmental Protection Agency (EPA) Method 6200B.
Monitored Natural Attenuation Report No. 10
Former Wilco No. 154 (Speedway No. 6953)
May 11, 2021 ATC Group Services LLC 3
3 Results
3.1 Site Geology / Hydrogeology
The site is located in the Piedmont Physiographic Province of North Carolina. The Piedmont consists of crystalline
metamorphic bedrock of Paleozoic age. The shallow subsurface in the Piedmont contains residual soil derived
from in-place weathering of the bedrock, and the soil varies in thickness from non-existent at bedrock outcrops to
depths of approximately 100 feet below land surface (bls) in areas of readily weathered bedrock. Residual soils
vary from structureless soils known as residuum, to soils with light relict rock features known as saprolite, to
partially weathered rock, which is often found as a zone immediately above the bedrock. Based on observations
made during soil boring activities, the residual soil at the site consists mainly of brown, red, and orange, fine sandy
and clayey silt.
The current depth to groundwater in the existing monitoring wells ranges from 23.70 feet below land surface (bls)
in monitoring well MW-03 to 27.80 feet bls in monitoring well MW-07. Groundwater in the Piedmont is usually first
encountered in unconfined or water table conditions in the pores of the residual soils, and such a condition exists
at the site. Groundwater becomes increasingly confined to fractures and other planar features of the bedrock as
bedrock integrity increases with depth. Natural groundwater quality in the Piedmont is high, and flow rates are
variable with zones of higher flow capacity often being found in partially weathered rock or in certain bedrock
fractures.
Data from Table 2 was used to create a groundwater elevation contour map, which is included as Figure 3. Based
on the groundwater elevation contour map, groundwater generally flows northwest, which is consistent with
historical groundwater flow.
3.2 Groundwater Analytical Results
Results of the most recent laboratory analysis of the groundwater samples collected from the select site monitoring
wells are summarized in Table 5 along with the North Carolina regulatory limits for drinking water (North Carolina
2L Standards) and GCLs. A historical summary of groundwater analytical data is included in Table 6. The
concentrations of petroleum constituents detected during the two most recent monitoring events are presented in
Figure 4. Groundwater analytical results for the samples collected during the current monitoring event indicate
the following:
 Concentrations of petroleum constituents were detected greater than their respective North Carolina 2L
Standards in the groundwater samples collected from monitoring wells MW-01, MW-02, MW-03, MW-05,
and MW-06; and
 A concentration of benzene was detected greater than its North Carolina GCL in the groundwater sample
collected from monitoring well MW-01.
A copy of the laboratory analytical report and chain-of-custody documentation is included in Appendix B.

Monitored Natural Attenuation Report No. 10
Former Wilco No. 154 (Speedway No. 6953)
May 11, 2021 ATC Group Services LLC 4
4 Findings and Conclusions
Based on data collected during the recent groundwater monitoring activities, the following conclusions are made:
> Free product was not detected in any gauged well during the groundwater monitoring event;
> Concentrations of petroleum constituents were detected greater than their respective North Carolina 2L
Standards in the groundwater samples collected from monitoring wells MW-01, MW-02, MW-03, MW-05, and
MW-06;
> A concentration of benzene was detected greater than its North Carolina GCL in the groundwater sample
collected from monitoring well MW-01; and
> Concentrations of constituents in groundwater appear to be decreasing or holding steady over time.

Monitored Natural Attenuation Report No. 10
Former Wilco No. 154 (Speedway No. 6953)
May 11, 2021 ATC Group Services LLC 5
5 Recommendations
Concentrations of chemicals of concern in groundwater appear to be decreasing or holding steady. Graphs of the
chemical concentrations vs time are presented in Appendix C. Benzene is the only chemical of concern that
remains above the GCL.
Based on the findings and conclusions of this report, the following recommendations are made:
 Continued semi-annual monitoring of decreasing chemicals of concern in site groundwater; and
 Once selective monitoring yields results below GCLs, a comprehensive monitoring event should occur
the following semi-annual period.
Once groundwater concentrations are less than GCLs and those levels are maintained for one year without
detection of free product, the site should be eligible for a low risk assignment and closure via Notice of Residual
Petroleum with deed restriction.

Monitored Natural Attenuation Report No. 10
Former Wilco No. 154 (Speedway No. 6953)
May 11, 2021 ATC Group Services LLC 6
6 Report Limitations
This investigation is intended to be a non-biased assessment of on-site environmental conditions proximate to the
location of the former and/or current UST system. Subsurface investigative and remedial methodologies were
performed in general accordance with applicable state and federal regulatory requirements. The information
presented in this report is based upon site-specific observations, generally accepted geological and environmental
consulting practices, and analytical results for environmental samples collected at the time the field investigation
was performed. The data presented in this report are believed to represent subsurface conditions at the facility;
however, data may not be completely representative of subsurface conditions at every location. ATC assumes no
liability arising from environmental impact to, or from, the site, regardless of the date of impact occurrence or
findings.

Monitored Natural Attenuation Report No. 10
Former Wilco No. 154 (Speedway No. 6953)
May 11, 2021

Former Wilco No. 154 (Speedway No.
6953)

TABLES
UST ID Number Product Capacity (gallons)Date Installed Date taken out of Use Date Permanently
Closed
Was Release
Associated With UST
System?
0-032388 Regular Unleaded 8,000 01/01/77 08/02/13 08/02/13 Yes
0-032388 Regular Unleaded 8,000 01/01/77 08/02/13 08/02/13 Yes
0-032388 Premium Unleaded 8,000 01/01/77 08/02/13 08/02/13 Yes
0-032388 Non-Ethanol Gasoline 8,000 01/01/77 08/02/13 08/02/13 Yes
0-032388 Diesel 8,000 01/01/84 08/02/13 08/02/13 Yes
UST ID Number Owner or Operator?
0-032388 Owner/Operator
5446 University Parkway [phone]
Winston Salem, North Carolina 27105
Name of Owner or Operator Dates of Ownership / Operation
WilcoHess LLC 1975 - 2013
Address Telephone Number
ATC ASSOCIATES OF NORTH CAROLINA, P.C. PROJECT NO. SWDP695307
TABLE 1
UST SYSTEM INFORMATION
FORMER WILCO NO. 154 (SPEEDWAY NO. 6953)
3030 NORTH MAIN STREET, HIGH POINT, NORTH CAROLINA
NCDEQ INCIDENT NO. 44219
Well ID Number
Total
Well Depth
(ft)
Screen Interval
(ft)
Top of Casing
Elevation
(ft)
Depth to Free
Product
(ft btoc)
Depth to
Groundwater
(ft btoc)
Free Product
Thickness
(ft)
Groundwater
Elevation
(ft)
Notes
09/09/19 ---26.45 ---968.56
10/03/19 ---27.23 ---967.78
03/04/21 ---24.81 ---970.20
09/09/19 ---26.14 ---968.02
10/03/19 ---26.47 ---967.69
03/04/21 ---24.13 ---970.03
09/09/19 ---25.30 ---970.04
10/03/19 ---25.60 ---969.74
03/04/21 ---23.70 ---971.64
09/09/19 ---29.59 ---965.75
10/03/19 ---29.87 ---965.47
03/04/21 ---27.71 ---968.05
09/09/19 ---28.98 ---966.36
10/03/19 ---29.28 ---966.06
03/04/21 ---26.91 ---968.00
09/09/19 ---27.46 ---967.88
10/03/19 ---27.82 ---966.64
03/04/21 ---25.65 ---969.15
09/09/19 ---30.16 ---964.88
10/03/19 ---30.13 ---964.91
03/04/21 ---27.80 ---967.24
09/09/19 ---29.62 ---964.84
10/03/19 ---29.75 ---964.71
03/04/21 ---27.41 ---967.05
NOTES:TOC = Top Of Well Casing
ft btoc = Feet below top of well casing
---= Not detected
*= With free product present, the following formula was used to calculate the groundwater elevation:
Groundwater Elevation = Actual Water Level Meaurement + ( Product Thickness x 0.73)
NM = Not Measured
MW-02
40 15-40 994.16
TABLE 2
SUMMARY OF RECENT GROUNDWATER ELEVATION MEASUREMENTS
FORMER WILCO NO. 154 (SPEEDWAY NO. 6953)
3030 NORTH MAIN STREET, HIGH POINT, NORTH CAROLINA
NCDEQ INCIDENT NO. 44219
ATC ASSOCIATES OF NORTH CAROLINA, P.C. PROJECT NO. SWDP695307
Date
MW-01
40 15-40 995.01
MW-03
40 15-40 995.34
MW-04
40 15-40 995.76
MW-05
40 15-40 994.91
MW-06
60 50-60 994.80
MW-07
50 40-50 995.04
MW-08
40 30-40 994.46
Well ID Number
Total
Well Depth
(ft)
Screen Interval
(ft)
Top of Casing
Elevation
(ft)
Depth to Free
Product
(ft btoc)
Depth to
Groundwater
(ft btoc)
Free Product
Thickness
(ft)
Groundwater
Elevation
(ft)
Notes
01/08/14 ---29.44 ---965.57
06/06/14 ---27.27 ---967.74
10/13/15 ---29.65 ---965.36
03/09/16 ---28.07 ---966.94
05/24/16 ---27.68 ---967.33
09/01/16 ---27.62 ---967.39
03/15/17 ---29.48 ---965.53
07/17/17 ---28.99 ---966.02
07/21/17 ---30.91 ---964.10
10/09/17 ---29.60 ---965.41
04/04/18 ---29.90 ---965.11
10/03/18 ---29.53 ---965.48
09/09/19 ---26.45 ---968.56
10/03/19 ---27.23 ---967.78
03/04/21 ---24.81 ---970.20
06/06/14 ---27.41 ---966.75
10/13/15 ---29.09 ---965.07
03/09/16 ---27.38 ---966.78
05/24/16 ---26.99 ---967.17
09/01/16 ---26.96 ---967.20
03/15/17 ---28.77 ---965.39
07/17/17 ---28.85 ---965.31
07/21/17 ---28.99 ---965.17
10/09/17 ---28.90 ---965.26
04/04/18 ---29.24 ---964.92
10/03/18 ---28.87 ---965.29
09/09/19 ---26.14 ---968.02
10/03/19 ---26.47 ---967.69
03/04/21 ---24.13 ---970.03
06/06/14 ---27.77 ---967.57
10/13/15 ---28.13 ---967.21
03/09/16 ---26.55 ---968.79
05/24/16 ---26.14 ---969.20
09/01/16 ---26.08 ---969.26
03/15/17 ---27.89 ---967.45
07/17/17 ---27.40 ---967.94
07/21/17 ---29.73 ---965.61
10/09/17 ---28.00 ---967.34
04/04/18 ---28.39 ---966.95
10/03/18 ---27.97 ---967.37
09/09/19 ---25.30 ---970.04
10/03/19 ---25.60 ---969.74
03/04/21 ---23.70 ---971.64
06/06/14 ---30.12 ---965.64
10/13/15 ---31.64 ---964.12
03/09/16 ---30.49 ---965.27
05/24/16 ---30.03 ---965.73
09/01/16 30.09 ---965.67
03/15/17 ---32.00 ---963.76
07/17/17 ---31.29 ---964.47
07/21/17 ---31.40 ---964.36
10/09/17 ---32.21 ---963.55
04/04/18 ---32.52 ---963.24
10/03/18 ---32.33 ---963.43
09/09/19 ---29.59 ---966.17
10/03/19 ---29.87 ---965.89
03/04/21 ---27.71 ---968.05
MW-03
40 15-40 995.34
MW-04
40 15-40 995.76
MW-02
40 15-40 994.16
TABLE 3
SUMMARY OF HISTORICAL GROUNDWATER ELEVATION MEASUREMENTS
FORMER WILCO NO. 154 (SPEEDWAY NO. 6953)
3030 NORTH MAIN STREET, HIGH POINT, NORTH CAROLINA
NCDEQ INCIDENT NO. 44219
ATC ASSOCIATES OF NORTH CAROLINA, P.C. PROJECT NO. SWDP695307
Date
MW-01
40 15-40 995.01
Well ID Number
Total
Well Depth
(ft)
Screen Interval
(ft)
Top of Casing
Elevation
(ft)
Depth to Free
Product
(ft btoc)
Depth to
Groundwater
(ft btoc)
Free Product
Thickness
(ft)
Groundwater
Elevation
(ft)
Notes
TABLE 3
SUMMARY OF HISTORICAL GROUNDWATER ELEVATION MEASUREMENTS
FORMER WILCO NO. 154 (SPEEDWAY NO. 6953)
3030 NORTH MAIN STREET, HIGH POINT, NORTH CAROLINA
NCDEQ INCIDENT NO. 44219
ATC ASSOCIATES OF NORTH CAROLINA, P.C. PROJECT NO. SWDP695307
Date
40 15-40 995.0106/06/14 ---29.56 ---965.35
10/13/15 ---31.30 ---963.61
03/09/16 ---29.97 ---964.94
05/24/16 ---29.56 ---965.35
09/01/16 ---29.52 ---965.39
03/15/17 ---31.33 ---963.58
07/17/17 ---30.84 ---964.07
07/21/17 ---30.86 ---964.05
10/09/17 ---31.52 ---963.39
04/04/18 ---31.84 ---963.07
10/03/18 ---31.63 ---963.28
09/09/19 ---28.98 ---965.93
10/03/19 ---29.28 ---965.63
03/04/21 ---26.91 ---968.00
04/03/15 ---28.64 ---966.16
10/13/15 ---30.00 ---964.80
03/09/16 ---28.59 ---966.21
05/24/16 ---NM ------
09/01/16 ---28.18 ---966.62
03/15/17 ---29.77 ---965.03
07/17/17 ---29.53 ---965.27
07/21/17 ---30.00 ---964.80
10/09/17 ---30.13 ---964.67
04/04/18 ---30.44 ---964.36
10/03/18 ---30.14 ---964.66
09/09/19 ---27.46 ---967.34
10/03/19 ---27.82 ---966.98
03/04/21 ---25.65 ---969.15
04/03/15 ---34.01 ---961.03
10/13/15 ---32.20 ---962.84
03/09/16 ---30.91 ---964.13
05/24/16 ---NM ------
09/01/16 ---30.48 ---964.56
03/15/17 ---32.19 ---962.85
07/17/17 ---31.88 ---963.16
07/21/17 ---31.82 ---963.22
10/09/17 ---32.34 ---962.70
04/04/18 ---32.70 ---962.34
10/03/18 ---32.51 ---962.53
09/09/19 ---30.16 ---964.88
10/03/19 ---30.13 ---964.91
03/04/21 ---27.80 ---967.24
MW-07
50 40-50 995.04
MW-05
40 15-40 994.91
MW-06
60 50-60 994.80
Well ID Number
Total
Well Depth
(ft)
Screen Interval
(ft)
Top of Casing
Elevation
(ft)
Depth to Free
Product
(ft btoc)
Depth to
Groundwater
(ft btoc)
Free Product
Thickness
(ft)
Groundwater
Elevation
(ft)
Notes
TABLE 3
SUMMARY OF HISTORICAL GROUNDWATER ELEVATION MEASUREMENTS
FORMER WILCO NO. 154 (SPEEDWAY NO. 6953)
3030 NORTH MAIN STREET, HIGH POINT, NORTH CAROLINA
NCDEQ INCIDENT NO. 44219
ATC ASSOCIATES OF NORTH CAROLINA, P.C. PROJECT NO. SWDP695307
Date
40 15-40 995.0104/03/15 ---31.62 ---962.84
10/13/15 ---31.81 ---962.65
03/09/16 ---30.50 ---963.96
05/24/16 ---NM ------
09/01/16 ---30.10 ---964.36
03/15/17 ---31.80 ---962.66
07/17/17 ---31.39 ---963.07
07/21/17 ---31.40 ---963.06
10/09/17 ---32.00 ---962.46
04/04/18 ---32.31 ---962.15
10/03/18 ---32.07 ---962.39
09/09/19 ---29.62 ---964.84
10/03/19 ---29.75 ---964.71
03/04/21 ---27.41 ---967.05
NOTES:TOC = Top Of Well Casing
ft btoc = Feet below top of well casing
---= Not detected
*= With free product present, the following formula was used to calculate the groundwater elevation:
Groundwater Elevation = Actual Water Level Meaurement + ( Product Thickness x 0.73)
NM = Not Measured
MW-08
40 30-40 994.46
Well No.Sample DateGauging DateSample TimeWell Depth TOC Elevation Depth to Free ProductDepth to Water Free Product Surface ElevationFree Product Thickness Water Surface Elevation Potentiometric Surface Elevation Height of Water Column Water Column Volume in Well 3-Volume Purge Temp. ( C)Conductivity (umhos)pHDONotes
(1)(ft)(ft)(ft)(ft)(ft)(ft)(ft)(ft)(ft)(gal)*(if needed)
MW-01 03/04/21 03/04/21 1320 40 995.01 ---24.81 ------970.20 ---15.19 2.4304 7.3 19.78 0.886 6.61 2.79
MW-02 03/04/21 03/04/21 1255 40 994.16 ---24.13 ------970.03 ---15.87 2.5392 7.6 20.80 0.842 6.51 2.91
MW-03 03/04/21 03/04/21 1340 40 995.34 ---23.70 ------971.64 ---16.30 2.608 7.8 20.05 0.703 6.63 2.18
MW-04 NS 03/04/21 NS 40 995.76 ---27.71 ------968.05 ---12.29 1.9664 ---------------Not Sampled
MW-05 03/04/21 03/04/21 1455 40 994.91 ---26.91 ------968.00 ---13.09 2.0944 6.3 20.10 0.944 6.57 1.89
MW-06 03/04/21 03/04/21 1425 60 994.80 ---25.65 ------969.15 ---34.35 5.496 ---20.21 0.442 6.28 1.49
MW-07 NS 03/04/21 NS 50 995.04 ---27.80 ------967.24 ---22.20 3.552 ---------------Not Sampled
MW-08 NS 03/04/21 NS 40 994.46 ---27.41 ------967.05 ---12.59 2.0144 ---------------Not Sampled
NOTES: NA = Not Applicable
NS = Not Sampled
UNK = Unknown
*To calculate volume of water in the well multiply "M" by 0.16 for a 2" well, 0.65 for a 4" well, or 1.46 for a 6" well.
**To calculate purge volume, multiply "I" by the desired number of well volumes (e.g., 3 to 5). Subsequent lines in this column to be used to track monitoring results of periodic representative well samples (e.g., after each well volume).
TOC = Top of Casing
---= No Data
TABLE 4
WELL DEVELOPMENT, PURGE, AND SAMPLE RECORD
FORMER WILCO NO. 154 (SPEEDWAY NO. 6953)
3030 NORTH MAIN STREET, HIGH POINT, NORTH CAROLINA
NCDEQ INCIDENT NO. 44219
ATC ASSOCIATES OF NORTH CAROLINA, P.C. PROJECT NO. SWDP695307
BenzeneTolueneEthylbenzeneXylenes (total)Total BTEXMTBENaphthalene 1, 2-Dichloroethane (DCA)1,2-Dibromoethane(EDB)Isopropyl ether(IPE)1 600 600 500 NE 20 6 0.4 0.02 70
5,000 260,000 84,500 85,500 NE 20,000 6,000 400 50 70,000
10/03/18 19,200 10,000 3,750 20,600 53,550 1,910 1,010 <90.2 NA 280
09/09/19 15,600 4,870 3,710 19,800 43,980 1,980 837 J <90.2 NA 327
03/04/21 11,400 4,110 1,850 8,370 25,730 793 461 J 50.6 J NA 241
10/03/18 3,050 83 1,210 728 5,071 850 276 23.2 NA 114
09/09/19 377 <20.6 181 <53 558 284 <50 <18 NA 58.5
03/04/21 18.9 8.46 7.79 20.3 55.45 50.7 14.2 2.80 NA 19.0
10/03/18 7,990 311 1,590 4,880 14,771 13,600 808 <180 NA 577
10/03/19 2,200 30.1 85.1 J 2,640 4,870.1 6,830 200 J 46.5 NA 306
03/04/21 4,690 427 1,110 1,290 7,517 12,100 697 82.5 J NA 466
10/03/18 NS NS NS NS ---NS NS NS NS NS
10/03/19 NS NS NS NS ---NS NS NS NS NS
03/04/21 NS NS NS NS ---NS NS NS NS NS
10/03/18 0.947J <0.412 <0.384 <1.06 0.947 169 <1.0 2.25 NA 123
09/09/19 4.08 <0.412 1.67 <1.06 5.75 224 <1.00 <0.361 NA 125
03/04/21 3.66 1.79 1.41 4.35 11.21 170 2.20 J 2.09 NA 90.4
10/03/18 NS NS NS NS ---NS NS NS NS NS
09/09/19 NS NS NS NS ---NS NS NS NS NS
03/04/21 1.71 1.04 0.678 J 2.63 J 6.058 3,810 <1.00 18.3 NA 126
10/03/18 NS NS NS NS ---NS NS NS NS NS
09/09/19 NS NS NS NS ---NS NS NS NS NS
03/04/21 NS NS NS NS ---NS NS NS NS NS
10/03/18 NS NS NS NS ---NS NS NS NS NS
09/09/19 NS NS NS NS ---NS NS NS NS NS
03/04/21 NS NS NS NS ---NS NS NS NS NS
NOTES:<X = Not Detected above Laboratory Detection Limit µg/L = Micrograms per liter
NC 2L GW Std. = Title 15A NCAC 2L .0202 Groundwater Standard NA = Not Analyzed
GCL = Gross Contaminant Level established by NCDEQ.NS = Not Sampled
BOLD concentrations are greater than the 2L Standard.NE = Not Established
BOLD and ITALICIZED concentrations are greater than the GCL.
MW-07
MW-08
MW-01
MW-02
MW-03
MW-04
MW-05
MW-06
Comments / Notes
2L Standard
GCL
ATC ASSOCIATES OF NORTH CAROLINA, P.C. PROJECT NO. SWDP69530
TABLE 5
SUMMARY OF RECENT GROUNDWATER ANALYTICAL RESULTS
FORMER WILCO NO. 154 (SPEEDWAY NO. 6953)
3030 NORTH MAIN STREET, HIGH POINT, NORTH CAROLINA
NCDEQ INCIDENT NO. 44219
Sample
DateWell Location
Chemicals of Concern
BenzeneTolueneEthylbenzeneXylenes (total)Total BTEXMTBENaphthalene 1, 2-Dichloroethane (DCA)1,2-Dibromoethane(EDB)Isopropyl ether(IPE)1 600 600 500 NE 20 6 0.4 0.02 70
5,000 260,000 84,500 85,500 NE 20,000 6,000 400 50 70,000
01/08/14 24,400 18,100 2,980 16,300 61,780 15,100 818 364 231 969
06/06/14 23,800 18,200 3,280 18,070 63,350 10,300 821 167 258 806
04/03/15 NS NS NS NS ---NS NS NS NS NS
10/13/15 16,500 9,930 2,730 15,910 45,070 1,660 <1,250 <250 <250 <294
03/09/16 19,600 14,300 3,480 17,260 54,640 1,550 706 <50 242 364
05/24/16 18,000 15,400 3,130 17,720 54,250 1,280 626 <100 210 324
09/01/16 18,800 13,900 4,090 21,600 58,390 867 855 <20 NA 150
03/15/17 17,200 10,200 3,070 16,000 46,470 1,730 845 <100 NA 298
10/09/17 22,200 14,600 4,120 21,800 62,720 1,600 <1,250 <250 NA 339
04/04/18 29,100 15,100 3,780 21,100 69,080 2,490 1,330 <250 NA 511
10/03/18 19,200 10,000 3,750 20,600 53,550 1,910 1,010 <90.2 NA 280
10/03/19 15,600 4,870 3,710 19,800 43,980 1,980 837 J <90.2 NA 327
03/04/21 11,400 4,110 1,850 8,370 25,730 793 461 J 50.6 J NA 241
01/08/14 NS NS NS NS ---NS NS NS NS NS
06/06/14 4,860 297 281 1,099 6,537 2,540 26.6 90.9 <0.50 254
04/03/15 NS NS NS NS ---NS NS NS NS NS
10/13/15 5,710 1,560 1,870 5,790 14,930 1,700 411 42.6 15.6 188
03/09/16 3,390 775 1,190 4,521 9,876 1,030 <250 <1.0 15.2 132
05/24/16 3,750 793 1,450 5,750 11,743 981 257 28.5 <25 133
09/01/16 3,780 886 1,480 5,150 11,296 722 310 <5 NA 87
03/15/17 2,640 639 1,030 3,530 7,839 1,000 320 27.0 NA 116
10/09/17 3,600 459 1,610 3,750 9,419 1,000 287 30.5 NA 128
04/04/18 3,180 459 1,610 3,750 8,999 1,000 287 30.5 NA 128
10/03/18 3,050 83 1,210 728 5,071 850 276 23.2 NA 114
09/09/19 377 <20.6 181 <53 558 284 <50 <18 NA 58.5
03/04/21 18.9 8.46 7.79 20.3 55.45 50.7 14.2 2.80 NA 19.0
01/08/14 NS NS NS NS ---NS NS NS NS NS
06/06/14 7,000 589 376 645 8,610 20,000 89.7 141 <0.50 641
04/03/15 NS NS NS NS ---NS NS NS NS NS
10/13/15 8,520 6,050 1,750 8,910 25,230 26.2 <1,250 <250 <250 918
03/09/16 10,900 7,070 1,940 9,800 29,710 24,900 <1,250 <250 <250 1,090
05/24/16 9,080 10,900 1,910 13,060 34,950 18,700 <1,000 <200 <200 828
09/01/16 10,100 12,100 2,390 12,900 37,490 16,300 887 <20 NA 569
03/15/17 8,610 7,440 1,890 10,600 28,540 13,200 795 <100 NA 686
10/09/17 10,200 3,290 2,040 9,590 25,120 15,600 1,170 103 NA 731
04/04/18 9,640 814 1,260 4,380 16,094 21,500 <2,500 <500 NA 868
10/03/18 7,990 311 1,590 4,880 14,771 13,600 808 <180 NA 577
10/03/19 2,200 30.1 85.1 J 2,640 4,955.2 6,830 200 J 46.5 NA 306
03/04/21 4,690 427 1,110 1,290 7,517 12,100 697 82.5 J NA 466
01/08/14 NS NS NS NS ---NS NS NS NS NS
06/06/14 3.0 <1.0 <1.0 <2.0 3.0 183 <2.0 1.5 <1.0 38.6
04/03/15 NS NS NS NS ---NS NS NS NS NS
10/13/15 <1.0 <5.0 <1.0 <2.0 ---<1.0 <5.0 <1.0 <1.0 1.83
03/09/16 <1.0 <5.0 <1.0 0 ---<1.0 <5.0 <1.0 <1.0 <1.0
05/24/16 <1.0 <5.0 <1.0 <2.0 ---<1.0 <5.0 <1.0 <1.0 <1.0
09/01/16 NS NS NS NS ---NS NS NS NS NS
03/15/17 <1 <1 <1 <3 ---<1 <5 <1 NA <1
10/09/17 <1 <1 <1 <3 ---<1 <5 <1 NA <1
04/04/18 <1 <1 <1 <3 ---<1 <5 <1 NA <1
10/03/18 NS NS NS NS ---NS NS NS NS NS
09/09/19 NS NS NS NS ---NS NS NS NS NS
03/04/21 NS NS NS NS ---NS NS NS NS NS
01/08/14 NS NS NS NS ---NS NS NS NS NS
06/06/14 2.3 <2.5 <2.4 <5.0 2.3 353 <5.0 5.1 <1.2 160
04/03/15 NS NS NS NS ---NS NS NS NS NS
10/13/15 <1.0 <5.0 <1.0 <2.0 ---422 <5.0 <1.0 <1.0 184
03/09/16 5.96 <5.0 6.82 3.41 16.19 302 <5.0 3.96 <1.0 128
05/24/16 6.16 <2.5 <5.0 <10 6.16 297 <2.5 <5.0 <5.0 149
09/01/16 NS NS NS NS ---NS NS NS NS NS
03/15/17 NS NS NS NS ---NS NS NS NS NS
10/09/17 NS NS NS NS ---NS NS NS NS NS
04/04/18 NS NS NS NS ---NS NS NS NS NS
10/03/18 0.947J <0.412 <0.384 <1.06 0.947 169 <1.0 2.25 NA 123
09/09/19 4.08 <0.412 1.67 <1.06 5.75 224 <1.00 <0.361 NA 125
03/04/21 3.66 1.79 1.41 4.35 11.21 170 2.20 J 2.09 NA 90.4
MW-01
MW-02
MW-03
MW-04
MW-05
Well Location Sample
Date
Chemical of Concern (µg/L)
Comments / Notes
2L Standard
GCL
ATC ASSOCIATES OF NORTH CAROLINA, P.C. PROJECT NO. SWDP695303
TABLE 6
SUMMARY OF HISTORICAL GROUNDWATER ANALYTICAL RESULTS
FORMER WILCO NO. 154 (SPEEDWAY NO. 6953)
3030 NORTH MAIN STREET, HIGH POINT, NORTH CAROLINA
NCDEQ INCIDENT NO. 44219
BenzeneTolueneEthylbenzeneXylenes (total)Total BTEXMTBENaphthalene 1, 2-Dichloroethane (DCA)1,2-Dibromoethane(EDB)Isopropyl ether(IPE)1 600 600 500 NE 20 6 0.4 0.02 70
5,000 260,000 84,500 85,500 NE 20,000 6,000 400 50 70,000
Well Location Sample
Date
Chemical of Concern (µg/L)
Comments / Notes
2L Standard
GCL
ATC ASSOCIATES OF NORTH CAROLINA, P.C. PROJECT NO. SWDP695303
TABLE 6
SUMMARY OF HISTORICAL GROUNDWATER ANALYTICAL RESULTS
FORMER WILCO NO. 154 (SPEEDWAY NO. 6953)
3030 NORTH MAIN STREET, HIGH POINT, NORTH CAROLINA
NCDEQ INCIDENT NO. 44219
01/08/14 NS NS NS NS ---NS NS NS NS NS
06/06/14 NS NS NS NS ---NS NS NS NS NS
04/03/15 51 <1.0 <1.0 <2.0 51 38 <5.0 5.3 <1.0 9.2
10/13/15 <1.0 <5.0 <1.0 <5.0 ---<1.0 16 <1.0 <2.0 2.64
03/09/16 <1.0 <5.0 <1.0 <3.0 ---19 <5.0 2.45 <1.0 5.11
05/24/16 NS NS NS NS ---NS NS NS NS NS
09/01/16 1.35 <5.0 <1.0 <3.0 1.35 174 1.47 J 5.38 NA 17.9
03/15/17 1.31 <1 <1 <3 1.31 463 <5 10.2 NA 32.0
10/09/17 <1 <1 <1 <3 ---1,430 <5 19.9 NA 83.1
04/04/18 <1 <1 <1 <3 ---4,500 <5 <50 NA 166
10/03/18 NS NS NS NS ---NS NS NS NS NS
09/09/19 NS NS NS NS ---NS NS NS NS NS
03/04/21 1.71 1.04 0.678 J 2.63 J 6.058 3,810 <1.00 18.3 NA 126
MW-06
BenzeneTolueneEthylbenzeneXylenes (total)Total BTEXMTBENaphthalene 1, 2-Dichloroethane (DCA)1,2-Dibromoethane(EDB)Isopropyl ether(IPE)1 600 600 500 NE 20 6 0.4 0.02 70
5,000 260,000 84,500 85,500 NE 20,000 6,000 400 50 70,000
Well Location Sample
Date
Chemical of Concern (µg/L)
Comments / Notes
2L Standard
GCL
ATC ASSOCIATES OF NORTH CAROLINA, P.C. PROJECT NO. SWDP695303
TABLE 6
SUMMARY OF HISTORICAL GROUNDWATER ANALYTICAL RESULTS
FORMER WILCO NO. 154 (SPEEDWAY NO. 6953)
3030 NORTH MAIN STREET, HIGH POINT, NORTH CAROLINA
NCDEQ INCIDENT NO. 44219
01/08/14 NS NS NS NS ---NS NS NS NS NS
06/06/14 NS NS NS NS ---NS NS NS NS NS
04/03/15 <1.0 <1.0 <1.0 <2.0 ---<1.0 <5.0 <1.0 <1.0 <1.0
10/13/15 <1.0 <5.0 <1.0 <2.0 ---<1.0 <5.0 <1.0 <1.0 <1.0
03/09/16 <1.0 <5.0 <1.0 <3.0 ---<1.0 <5.0 <1.0 <1.0 <1.0
05/24/16 NS NS NS NS ---NS NS NS NS NS
09/01/16 NS NS NS NS ---NS NS NS NS NS
03/15/17 NS NS NS NS ---NS NS NS NS NS
10/09/17 NS NS NS NS ---NS NS NS NS NS
04/04/18 NS NS NS NS ---NS NS NS NS NS
10/03/18 NS NS NS NS ---NS NS NS NS NS
09/09/19 NS NS NS NS ---NS NS NS NS NS
03/04/21 NS NS NS NS ---NS NS NS NS NS
01/08/14 NS NS NS NS ---NS NS NS NS NS
06/06/14 NS NS NS NS ---NS NS NS NS NS
04/03/15 <1.0 <1.0 <1.0 <2.0 ---1.4 <5.0 <1.0 <1.0 <1.0
10/13/15 <1.0 <5.0 <1.0 <2.0 ---1.29 <5.0 <1.0 <1.0 <1.0
03/09/16 <1.0 <5.0 <1.0 <3.0 ---1.23 <5.0 <1.0 <1.0 <1.0
05/24/16 NS NS NS NS ---NS NS NS NS NS
09/01/16 NS NS NS NS ---NS NS NS NS NS
03/15/17 NS NS NS NS ---NS NS NS NS NS
10/09/17 NS NS NS NS ---NS NS NS NS NS
04/04/18 NS NS NS NS ---NS NS NS NS NS
10/03/18 NS NS NS NS ---NS NS NS NS NS
09/09/19 NS NS NS NS ---NS NS NS NS NS
03/04/21 NS NS NS NS ---NS NS NS NS NS
NOTES:<X = Not Detected above Laboratory Detection Limit µg/L = Micrograms per liter NC = Not Calculated
NC 2L GW Std. = Title 15A NCAC 2L .0202 Groundwater Standard NA = Not Analyzed J = Estimated result
GCL = Gross Contaminant Level established by NCDEQ.NS = Not Sampled
BOLD concentrations are greater than the 2L Standard.NE = Not Established
BOLD and ITALICIZED concentrations are greater than the GCL.
MW-07
MW-08
Well Location Sample
Date
Ammonia Nitrogen(Method 350.1)Nitrate-Nitrite (Method 353.2)Nitrate (Method 9056A)Nitrite (Method 9056A)Sulfate (Method 9056A)Dissolved Iron (Method 6010D)Dissolved Manganese (Method 6010D)10/03/19 45.0 J <19.7 <22.7 <27.7 23,200 46.1 J 8,540 V
10/03/19 55.0 J <19.7 <22.7 <27.7 11,800 284 6,790
10/03/19 34.0 J <19.7 <22.7 <27.7 151 J 73.5 J 7,450
10/03/19 NS NS NS NS NS NS NS
10/03/19 96.0 J <19.7 <22.7 <27.7 292 J 507 8,500
10/03/19 NS NS NS NS NS NS NS
10/03/19 NS NS NS NS NS NS NS
10/03/19 NS NS NS NS NS NS NS
NOTES:<X = Not Detected above Laboratory Detection Limit
J = Estimated result
V = Concentration too high to evaluate accurate spike recovery.
µg/L = Micrograms per liter
NS = Not Sampled
Natural Attenuation Parameters
Comments / Notes
TABLE 7
SUMMARY OF NATURAL ATTENUATION GROUNDWATER ANALYTICAL RESULTS
FORMER WILCO NO. 154 (SPEEDWAY NO. 6953)
3030 NORTH MAIN STREET, HIGH POINT, NORTH CAROLINA
NCDEQ INCIDENT NO. 44219
ATC ASSOCIATES OF NORTH CAROLINA, P.C. PROJECT NO. SWDP69530
MW-07
MW-08
MW-01
MW-02
MW-03
MW-04
MW-05
MW-06
Monitored Natural Attenuation Report No. 10
Former Wilco No. 154 (Speedway No. 6953)
May 11, 2021

Former Wilco No. 154 (Speedway No.
6953)

FIGURES

N
SITE
LOCATION
SITE LOCATION MAP
DATE:PROJECT NO.:
SCALE:
FIGURE 1
DRAWN BY:
REVIEWED BY:
EMAIL: WWW.ATCGROUPSERVICES.COM
CHARLOTTE, NORTH CAROLINA 28217
PHONE: [phone] FAX: [phone]
ASSOCIATES OF NORTH CAROLINA, P.C.
MW-8MW-7MW-5MW-4MW-6MW-1MW-2MW-3NORTH MAIN STREETOLD WINSTON ROAD= MONITORING WELL LOCATION
MW-8MW-7MW-5MW-4MW-6MW-1MW-2MW-3NORTH MAIN STREETOLD WINSTON ROAD= GROUNDWATER ELEVATION IN FEET= MONITORING WELL LOCATION= GROUNDWATER ELEVATION CONTOUR (DASHED WHERE INFERRED)= GROUNDWATER FLOW DIRECTION82.87967.05967.24968.05970.20971.64970.03968.0968.00969.00970.00971.00969.15
MW-8MW-7MW-5MW-4MW-6MW-1MW-2MW-3NORTH MAIN STREETOLD WINSTON ROAD= MONITORING WELL LOCATION
Monitored Natural Attenuation Report No. 10
Former Wilco No. 154 (Speedway No. 6953)
May 11, 2021

Former Wilco No. 154 (Speedway No.
6953)

APPENDIX A
PREAPPROVED TASK
AUTHORIZATION
Monitored Natural Attenuation Report No. 10
Former Wilco No. 154 (Speedway No. 6953)
May 11, 2021

Former Wilco No. 154 (Speedway No.
6953)

APPENDIX B
LABORATORY ANALYSIS REPORT
GROUNDWATER

ANALYTICAL REPORT
March 19, 2021
ATC Group Services - SC - Speedway
Sample Delivery Group:L1324060
Samples Received:03/06/2021
Project Number:0006953
Description:SW 6953
Site:0006953 0-032388
Report To:Bob Bolton / Donald Hurdle
6904 North Main Street
Suite 107
Columbia, SC 29203
Entire Report Reviewed By:
March 19, 2021
[Preliminary Report]
John Hawkins
Project Manager
Results relate only to the items tested or calibrated and are reported as rounded values. This test report shall not be reproduced, except in full, without written approval of the laboratory. Where applicable, sampling conducted by Pace Analytical National is performed per guidance provided in laboratory standard operating procedures ENV-SOP-MTJL-0067 and ENV-SOP-MTJL-0068. Where sampling conducted by the customer, results relate to the accuracy of the information provided, and as the samples are received.
Pace Analytical National
12065 Lebanon Rd Mount Juliet, TN 37122 615-758-5858 800-767-5859 www.pacenational.com
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
ATC Group Services - SC - Speedway 0006953 L1324060 03/19/21 16:36 1 of 16
March 24, 2021
John Hawkins
Project Manager
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
ATC Group Services - SC - Speedway 0006953 L1324060 03/24/21 09:33 1 of 16
TABLE OF CONTENTS
Cp: Cover Page 1
Tc: Table of Contents 2
Ss: Sample Summary 3
Cn: Case Narrative 4
Sr: Sample Results 5
MW-01 L1324060-01 5
MW-02 L1324060-02 6
MW-03 L1324060-03 7
MW-05 L1324060-04 8
MW-06 L1324060-05 9
Qc: Quality Control Summary 10
Volatile Organic Compounds (GC/MS) by Method 6200B-1997/6200B-2011 10
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 12
Gl: Glossary of Terms 13
Al: Accreditations & Locations 14
Sc: Sample Chain of Custody 15
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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ATC Group Services - SC - Speedway 0006953 L1324060 03/24/21 09:33 2 of 16
SAMPLE SUMMARY
Collected by Collected date/time Received date/time
MW-01 L1324060-01 GW Jacob Miller 03/04/21 13:20 03/06/21 10:10
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 6200B-1997/6200B-2011 WG1633924 100 03/13/21 03:17 03/13/21 03:17 ADM Mt. Juliet, TN
Collected by Collected date/time Received date/time
MW-02 L1324060-02 GW Jacob Miller 03/04/21 12:55 03/06/21 10:10
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 6200B-1997/6200B-2011 WG1633093 1 03/11/21 14:44 03/11/21 14:44 AV Mt. Juliet, TN
Collected by Collected date/time Received date/time
MW-03 L1324060-03 GW Jacob Miller 03/04/21 13:40 03/06/21 10:10
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 6200B-1997/6200B-2011 WG1633093 100 03/11/21 18:30 03/11/21 18:30 AV Mt. Juliet, TN
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 WG1633479 200 03/12/21 19:23 03/12/21 19:23 ADM Mt. Juliet, TN
Collected by Collected date/time Received date/time
MW-05 L1324060-04 GW Jacob Miller 03/04/21 14:55 03/06/21 10:10
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 6200B-1997/6200B-2011 WG1633093 1 03/11/21 15:04 03/11/21 15:04 AV Mt. Juliet, TN
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 WG1633479 5 03/12/21 19:43 03/12/21 19:43 ADM Mt. Juliet, TN
Collected by Collected date/time Received date/time
MW-06 L1324060-05 GW Jacob Miller 03/04/21 14:25 03/06/21 10:10
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 6200B-1997/6200B-2011 WG1633093 1 03/11/21 15:25 03/11/21 15:25 AV Mt. Juliet, TN
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 WG1633479 50 03/12/21 20:04 03/12/21 20:04 ADM Mt. Juliet, TN
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
ATC Group Services - SC - Speedway 0006953 L1324060 03/19/21 16:36 3 of 16
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
ATC Group Services - SC - Speedway 0006953 L1324060 03/24/21 09:33 3 of 16
CASE NARRATIVE
All sample aliquots were received at the correct temperature, in the proper containers, with the
appropriate preservatives, and within method specified holding times, unless qualified or notated within
the report. Where applicable, all MDL (LOD) and RDL (LOQ) values reported for environmental samples
have been corrected for the dilution factor used in the analysis. All Method and Batch Quality Control
are within established criteria except where addressed in this case narrative, a non-conformance form
or properly qualified within the sample results. By my digital signature below, I affirm to the best of my
knowledge, all problems/anomalies observed by the laboratory as having the potential to affect the
quality of the data have been identified by the laboratory, and no information or data have been
knowingly withheld that would affect the quality of the data.
[Preliminary Report]
John Hawkins
Project Manager
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
ATC Group Services - SC - Speedway 0006953 L1324060 03/19/21 16:36 4 of 16
John Hawkins
Project Manager
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
ATC Group Services - SC - Speedway 0006953 L1324060 03/24/21 09:33 4 of 16
SAMPLE RESULTS - 01
L1324060
MW-01
Collected date/time: 03/04/21 13:20
Volatile Organic Compounds (GC/MS) by Method 6200B-1997/6200B-2011
Result Qualifier MDL RDL Dilution Analysis Batch
Analyte ug/l ug/l ug/l date / time
Benzene 11400 9.41 100 100 03/13/2021 03:17 WG1633924
1,2-Dichloroethane 50.6 J 8.19 100 100 03/13/2021 03:17 WG1633924
Di-isopropyl ether 241 10.5 100 100 03/13/2021 03:17 WG1633924
Ethylbenzene 1850 13.7 100 100 03/13/2021 03:17 WG1633924
Methyl tert-butyl ether 793 10.1 100 100 03/13/2021 03:17 WG1633924
Naphthalene 461 J 100 500 100 03/13/2021 03:17 WG1633924
Toluene 4110 27.8 100 100 03/13/2021 03:17 WG1633924
Total Xylenes 8370 17.4 300 100 03/13/2021 03:17 WG1633924
(S) Toluene-d8 105 80.0-120 03/13/2021 03:17 WG1633924
(S) 4-Bromofluorobenzene 103 77.0-126 03/13/2021 03:17 WG1633924
(S) 1,2-Dichloroethane-d4 108 70.0-130 03/13/2021 03:17 WG1633924
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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SAMPLE RESULTS - 02
L1324060
MW-02
Collected date/time: 03/04/21 12:55
Volatile Organic Compounds (GC/MS) by Method 6200B-1997/6200B-2011
Result Qualifier MDL RDL Dilution Analysis Batch
Analyte ug/l ug/l ug/l date / time
Benzene 18.9 0.0941 1.00 1 03/11/2021 14:44 WG1633093
1,2-Dichloroethane 2.80 0.0819 1.00 1 03/11/2021 14:44 WG1633093
Di-isopropyl ether 19.0 0.105 1.00 1 03/11/2021 14:44 WG1633093
Ethylbenzene 7.79 0.137 1.00 1 03/11/2021 14:44 WG1633093
Methyl tert-butyl ether 50.7 0.101 1.00 1 03/11/2021 14:44 WG1633093
Naphthalene 14.2 1.00 5.00 1 03/11/2021 14:44 WG1633093
Toluene 8.46 0.278 1.00 1 03/11/2021 14:44 WG1633093
Total Xylenes 20.3 0.174 3.00 1 03/11/2021 14:44 WG1633093
(S) Toluene-d8 98.3 80.0-120 03/11/2021 14:44 WG1633093
(S) 4-Bromofluorobenzene 100 77.0-126 03/11/2021 14:44 WG1633093
(S) 1,2-Dichloroethane-d4 105 70.0-130 03/11/2021 14:44 WG1633093
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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SAMPLE RESULTS - 03
L1324060
MW-03
Collected date/time: 03/04/21 13:40
Volatile Organic Compounds (GC/MS) by Method 6200B-1997/6200B-2011
Result Qualifier MDL RDL Dilution Analysis Batch
Analyte ug/l ug/l ug/l date / time
Benzene 4690 9.41 100 100 03/11/2021 18:30 WG1633093
1,2-Dichloroethane 82.5 J 8.19 100 100 03/11/2021 18:30 WG1633093
Di-isopropyl ether 466 10.5 100 100 03/11/2021 18:30 WG1633093
Ethylbenzene 1110 13.7 100 100 03/11/2021 18:30 WG1633093
Methyl tert-butyl ether 12100 20.2 200 200 03/12/2021 19:23 WG1633479
Naphthalene 697 100 500 100 03/11/2021 18:30 WG1633093
Toluene 427 27.8 100 100 03/11/2021 18:30 WG1633093
Total Xylenes 1290 17.4 300 100 03/11/2021 18:30 WG1633093
(S) Toluene-d8 104 80.0-120 03/11/2021 18:30 WG1633093
(S) Toluene-d8 95.1 80.0-120 03/12/2021 19:23 WG1633479
(S) 4-Bromofluorobenzene 105 77.0-126 03/11/2021 18:30 WG1633093
(S) 4-Bromofluorobenzene 103 77.0-126 03/12/2021 19:23 WG1633479
(S) 1,2-Dichloroethane-d4 104 70.0-130 03/11/2021 18:30 WG1633093
(S) 1,2-Dichloroethane-d4 126 70.0-130 03/12/2021 19:23 WG1633479
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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SAMPLE RESULTS - 04
L1324060
MW-05
Collected date/time: 03/04/21 14:55
Volatile Organic Compounds (GC/MS) by Method 6200B-1997/6200B-2011
Result Qualifier MDL RDL Dilution Analysis Batch
Analyte ug/l ug/l ug/l date / time
Benzene 3.66 0.0941 1.00 1 03/11/2021 15:04 WG1633093
1,2-Dichloroethane 2.09 0.0819 1.00 1 03/11/2021 15:04 WG1633093
Di-isopropyl ether 90.4 0.525 5.00 5 03/12/2021 19:43 WG1633479
Ethylbenzene 1.41 0.137 1.00 1 03/11/2021 15:04 WG1633093
Methyl tert-butyl ether 170 0.505 5.00 5 03/12/2021 19:43 WG1633479
Naphthalene 2.20 J 1.00 5.00 1 03/11/2021 15:04 WG1633093
Toluene 1.79 0.278 1.00 1 03/11/2021 15:04 WG1633093
Total Xylenes 4.35 0.174 3.00 1 03/11/2021 15:04 WG1633093
(S) Toluene-d8 101 80.0-120 03/11/2021 15:04 WG1633093
(S) Toluene-d8 93.6 80.0-120 03/12/2021 19:43 WG1633479
(S) 4-Bromofluorobenzene 103 77.0-126 03/11/2021 15:04 WG1633093
(S) 4-Bromofluorobenzene 103 77.0-126 03/12/2021 19:43 WG1633479
(S) 1,2-Dichloroethane-d4 105 70.0-130 03/11/2021 15:04 WG1633093
(S) 1,2-Dichloroethane-d4 125 70.0-130 03/12/2021 19:43 WG1633479
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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SAMPLE RESULTS - 05
L1324060
MW-06
Collected date/time: 03/04/21 14:25
Volatile Organic Compounds (GC/MS) by Method 6200B-1997/6200B-2011
Result Qualifier MDL RDL Dilution Analysis Batch
Analyte ug/l ug/l ug/l date / time
Benzene 1.71 0.0941 1.00 1 03/11/2021 15:25 WG1633093
1,2-Dichloroethane 18.3 0.0819 1.00 1 03/11/2021 15:25 WG1633093
Di-isopropyl ether 126 5.25 50.0 50 03/12/2021 20:04 WG1633479
Ethylbenzene 0.678 J 0.137 1.00 1 03/11/2021 15:25 WG1633093
Methyl tert-butyl ether 3810 5.05 50.0 50 03/12/2021 20:04 WG1633479
Naphthalene U 1.00 5.00 1 03/11/2021 15:25 WG1633093
Toluene 1.04 0.278 1.00 1 03/11/2021 15:25 WG1633093
Total Xylenes 2.63 J 0.174 3.00 1 03/11/2021 15:25 WG1633093
(S) Toluene-d8 102 80.0-120 03/11/2021 15:25 WG1633093
(S) Toluene-d8 95.0 80.0-120 03/12/2021 20:04 WG1633479
(S) 4-Bromofluorobenzene 100 77.0-126 03/11/2021 15:25 WG1633093
(S) 4-Bromofluorobenzene 103 77.0-126 03/12/2021 20:04 WG1633479
(S) 1,2-Dichloroethane-d4 118 70.0-130 03/11/2021 15:25 WG1633093
(S) 1,2-Dichloroethane-d4 126 70.0-130 03/12/2021 20:04 WG1633479
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG1633093
Volatile Organic Compounds (GC/MS) by Method 6200B-1997/6200B-2011 L1324060-02,03,04,05
Method Blank (MB)
(MB) R3629921-2 03/11/21 13:01
MB Result MB Qualifier MB MDL MB RDL
Analyte ug/l ug/l ug/l
Benzene U 0.0941 1.00
1,2-Dichloroethane U 0.0819 1.00
Di-isopropyl ether U 0.105 1.00
Ethylbenzene U 0.137 1.00
Methyl tert-butyl ether U 0.101 1.00
Naphthalene U 1.00 5.00
Toluene U 0.278 1.00
Xylenes, Total U 0.174 3.00
(S) Toluene-d8 109 80.0-120
(S) 4-Bromofluorobenzene 106 77.0-126
(S) 1,2-Dichloroethane-d4 102 70.0-130
Laboratory Control Sample (LCS)
(LCS) R3629921-1 03/11/21 11:54
Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier
Analyte ug/l ug/l %%
Benzene 5.00 4.84 96.8 70.0-123
1,2-Dichloroethane 5.00 4.60 92.0 70.0-128
Di-isopropyl ether 5.00 4.66 93.2 58.0-138
Ethylbenzene 5.00 4.73 94.6 79.0-123
Methyl tert-butyl ether 5.00 4.75 95.0 68.0-125
Naphthalene 5.00 4.92 98.4 54.0-135
Toluene 5.00 4.74 94.8 79.0-120
Xylenes, Total 15.0 14.3 95.3 79.0-123
(S) Toluene-d8 101 80.0-120
(S) 4-Bromofluorobenzene 102 77.0-126
(S) 1,2-Dichloroethane-d4 103 70.0-130
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG1633924
Volatile Organic Compounds (GC/MS) by Method 6200B-1997/6200B-2011 L1324060-01
Method Blank (MB)
(MB) R3630343-4 03/13/21 00:13
MB Result MB Qualifier MB MDL MB RDL
Analyte ug/l ug/l ug/l
Benzene U 0.0941 1.00
1,2-Dichloroethane U 0.0819 1.00
Di-isopropyl ether U 0.105 1.00
Ethylbenzene U 0.137 1.00
Methyl tert-butyl ether U 0.101 1.00
Naphthalene U 1.00 5.00
Toluene U 0.278 1.00
Xylenes, Total U 0.174 3.00
(S) Toluene-d8 109 80.0-120
(S) 4-Bromofluorobenzene 97.1 77.0-126
(S) 1,2-Dichloroethane-d4 108 70.0-130
Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD)
(LCS) R3630343-1 03/12/21 22:52 • (LCSD) R3630343-2 03/12/21 23:12
Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits
Analyte ug/l ug/l ug/l %%%%%
Benzene 5.00 4.61 4.57 92.2 91.4 70.0-123 0.871 20
1,2-Dichloroethane 5.00 4.92 4.81 98.4 96.2 70.0-128 2.26 20
Di-isopropyl ether 5.00 4.84 4.50 96.8 90.0 58.0-138 7.28 20
Ethylbenzene 5.00 4.44 4.34 88.8 86.8 79.0-123 2.28 20
Methyl tert-butyl ether 5.00 4.20 4.47 84.0 89.4 68.0-125 6.23 20
Naphthalene 5.00 3.82 3.99 76.4 79.8 54.0-135 4.35 20
Toluene 5.00 4.33 4.30 86.6 86.0 79.0-120 0.695 20
Xylenes, Total 15.0 13.1 13.0 87.3 86.7 79.0-123 0.766 20
(S) Toluene-d8 105 105 80.0-120
(S) 4-Bromofluorobenzene 105 101 77.0-126
(S) 1,2-Dichloroethane-d4 114 110 70.0-130
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG1633479
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 L1324060-03,04,05
Method Blank (MB)
(MB) R3630407-2 03/12/21 16:14
MB Result MB Qualifier MB MDL MB RDL
Analyte ug/l ug/l ug/l
Di-isopropyl ether U 0.105 1.00
Methyl tert-butyl ether U 0.101 1.00
(S) Toluene-d8 94.4 80.0-120
(S) 4-Bromofluorobenzene 102 77.0-126
(S) 1,2-Dichloroethane-d4 120 70.0-130
Laboratory Control Sample (LCS)
(LCS) R3630407-1 03/12/21 15:13
Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier
Analyte ug/l ug/l %%
Di-isopropyl ether 5.00 4.46 89.2 58.0-138
Methyl tert-butyl ether 5.00 5.08 102 68.0-125
(S) Toluene-d8 94.0 80.0-120
(S) 4-Bromofluorobenzene 103 77.0-126
(S) 1,2-Dichloroethane-d4 121 70.0-130
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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GLOSSARY OF TERMS
Guide to Reading and Understanding Your Laboratory Report
The information below is designed to better explain the various terms used in your report of analytical results from the Laboratory. This is not
intended as a comprehensive explanation, and if you have additional questions please contact your project representative.
Results Disclaimer - Information that may be provided by the customer, and contained within this report, include Permit Limits, Project Name,
Sample ID, Sample Matrix, Sample Preservation, Field Blanks, Field Spikes, Field Duplicates, On-Site Data, Sampling Collection Dates/Times, and
Sampling Location. Results relate to the accuracy of this information provided, and as the samples are received.
Abbreviations and Definitions
MDL Method Detection Limit.
RDL Reported Detection Limit.
Rec.Recovery.
RPD Relative Percent Difference.
SDG Sample Delivery Group.
(S)
Surrogate (Surrogate Standard) - Analytes added to every blank, sample, Laboratory Control Sample/Duplicate and
Matrix Spike/Duplicate; used to evaluate analytical efficiency by measuring recovery. Surrogates are not expected to be
detected in all environmental media.
U Not detected at the Reporting Limit (or MDL where applicable).
Analyte The name of the particular compound or analysis performed. Some Analyses and Methods will have multiple analytes
reported.
Dilution
If the sample matrix contains an interfering material, the sample preparation volume or weight values differ from the
standard, or if concentrations of analytes in the sample are higher than the highest limit of concentration that the
laboratory can accurately report, the sample may be diluted for analysis. If a value different than 1 is used in this field, the
result reported has already been corrected for this factor.
Limits
These are the target % recovery ranges or % difference value that the laboratory has historically determined as normal
for the method and analyte being reported. Successful QC Sample analysis will target all analytes recovered or
duplicated within these ranges.
Qualifier
This column provides a letter and/or number designation that corresponds to additional information concerning the result
reported. If a Qualifier is present, a definition per Qualifier is provided within the Glossary and Definitions page and
potentially a discussion of possible implications of the Qualifier in the Case Narrative if applicable.
Result
The actual analytical final result (corrected for any sample specific characteristics) reported for your sample. If there was
no measurable result returned for a specific analyte, the result in this column may state “ND” (Not Detected) or “BDL”
(Below Detectable Levels). The information in the results column should always be accompanied by either an MDL
(Method Detection Limit) or RDL (Reporting Detection Limit) that defines the lowest value that the laboratory could detect
or report for this analyte.
Uncertainty
(Radiochemistry)Confidence level of 2 sigma.
Case Narrative (Cn)
A brief discussion about the included sample results, including a discussion of any non-conformances to protocol
observed either at sample receipt by the laboratory from the field or during the analytical process. If present, there will
be a section in the Case Narrative to discuss the meaning of any data qualifiers used in the report.
Quality Control
Summary (Qc)
This section of the report includes the results of the laboratory quality control analyses required by procedure or
analytical methods to assist in evaluating the validity of the results reported for your samples. These analyses are not
being performed on your samples typically, but on laboratory generated material.
Sample Chain of
Custody (Sc)
This is the document created in the field when your samples were initially collected. This is used to verify the time and
date of collection, the person collecting the samples, and the analyses that the laboratory is requested to perform. This
chain of custody also documents all persons (excluding commercial shippers) that have had control or possession of the
samples from the time of collection until delivery to the laboratory for analysis.
Sample Results (Sr)
This section of your report will provide the results of all testing performed on your samples. These results are provided
by sample ID and are separated by the analyses performed on each sample. The header line of each analysis section for
each sample will provide the name and method number for the analysis reported.
Sample Summary (Ss)This section of the Analytical Report defines the specific analyses performed for each sample ID, including the dates and
times of preparation and/or analysis.
Qualifier Description
J The identification of the analyte is acceptable; the reported value is an estimate.
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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Pace Analytical National 12065 Lebanon Rd Mount Juliet, TN 37122
Alabama 40660 Nebraska NE-OS-15-05
Alaska 17-026 Nevada TN000032021-1
Arizona AZ0612 New Hampshire 2975
Arkansas 88-0469 New Jersey–NELAP TN002
California 2932 New Mexico ¹TN00003
Colorado TN00003 New York 11742
Connecticut PH-0197 North Carolina Env375
Florida E87487 North Carolina ¹DW21704
Georgia NELAP North Carolina ³41
Georgia ¹923 North Dakota R-140
Idaho TN00003 Ohio–VAP CL0069
Illinois 200008 Oklahoma 9915
Indiana C-TN-01 Oregon TN200002
Iowa 364 Pennsylvania 68-02979
Kansas E-10277 Rhode Island LAO00356
Kentucky ¹ ⁶KY90010 South Carolina 84004002
Kentucky ²16 South Dakota n/a
Louisiana AI30792 Tennessee ¹ ⁴2006
Louisiana LA018 Texas T104704245-20-18
Maine TN00003 Texas ⁵LAB0152
Maryland 324 Utah TN000032021-11
Massachusetts M-TN003 Vermont VT2006
Michigan 9958 Virginia 110033
Minnesota 047-999-395 Washington C847
Mississippi TN00003 West Virginia 233
Missouri 340 Wisconsin 998093910
Montana CERT0086 Wyoming A2LA
A2LA – ISO 17025 1461.01 AIHA-LAP,LLC EMLAP 100789
A2LA – ISO 17025 ⁵1461.02 DOD 1461.01
Canada 1461.01 USDA P330-15-00234
EPA–Crypto TN00003
ACCREDITATIONS & LOCATIONS

¹ Drinking Water ² Underground Storage Tanks ³ Aquatic Toxicity ⁴ Chemical/Microbiological ⁵ Mold ⁶ Wastewater n/a Accreditation not applicable
* Not all certifications held by the laboratory are applicable to the results reported in the attached report.
* Accreditation is only applicable to the test methods specified on each scope of accreditation held by Pace Analytical.
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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Monitored Natural Attenuation Report No. 10
Former Wilco No. 154 (Speedway No. 6953)
May 11, 2021

Former Wilco No. 154 (Speedway No.
6953)

APPENDIX C
CHEMICAL CONCENTRATIONS IN GROUNDWATER VS TIME

0
5,000
10,000
15,000
20,000
25,000
30,000
35,000
Benzene (ug/L)Date
MW-01 Dissolved Phase Benzene Concentration Versus Time
Benzene
Linear (Benzene)
0
2,000
4,000
6,000
8,000
10,000
12,000
14,000
16,000
18,000
20,000
Toluene (ug/L)Date
MW-01 Dissolved Phase Toluene Concentration Versus Time
Toluene
Linear (Toluene)
2,000
2,500
3,000
3,500
4,000
4,500
Ethylbenzene (ug/L)Date
MW-01 Dissolved Phase Ethylbenzene Concentration Versus Time
Ethylbenzene
Linear
(Ethylbenzene)
0
5,000
10,000
15,000
20,000
25,000
Total Xylenes (ug/L)Date
MW-01 Dissolved Phase Total Xylenes Concentration Versus Time
Xylenes
Linear (Xylenes)
0
200
400
600
800
1000
1200
1400
Napthalene (ug/L)Date
MW-01 Dissolved Phase Napthalene Concentration Versus Time
Napthalene
Linear (Napthalene)
500
2,500
4,500
6,500
8,500
10,500
12,500
14,500
16,500
MTBE (ug/L)Date
MW-01 Dissolved Phase MTBE Concentration Versus Time
MTBE
Linear (MTBE)
0
1,000
2,000
3,000
4,000
5,000
6,000
Benzene (ug/L)Date
MW-02 Dissolved Phase Benzene Concentration Versus Time
Benzene
Linear (Benzene)
-200
0
200
400
600
800
1,000
1,200
1,400
1,600
1,800
Toluene (ug/L)Date
MW-02 Dissolved Phase Toluene Concentration Versus Time
Toluene
Linear (Toluene)
0
200
400
600
800
1,000
1,200
1,400
1,600
1,800
2,000
Ethylbenzene (ug/L)Date
MW-02 Dissolved Phase Ethylbenzene Concentration Versus Time
Ethylbenzene
Linear
(Ethylbenzene)
0
1,000
2,000
3,000
4,000
5,000
6,000
7,000
Total Xylenes (ug/L)Date
MW-02 Dissolved Phase Total Xylenes Concentration Versus Time
Xylenes
Linear (Xylenes)
0
50
100
150
200
250
300
350
400
450
Napthalene (ug/L)Date
MW-02 Dissolved Phase Napthalene Concentration Versus Time
Napthalene
Linear (Napthalene)
-500
0
500
1,000
1,500
2,000
2,500
3,000
MTBE (ug/L)Date
MW-02 Dissolved Phase MTBE Concentration Versus Time
MTBE
Linear (MTBE)
0
2,000
4,000
6,000
8,000
10,000
12,000
Benzene (ug/L)Date
MW-03 Dissolved Phase Benzene Concentration Versus Time
Benzene
Linear (Benzene )
0
2,000
4,000
6,000
8,000
10,000
12,000
14,000
Toluene (ug/L)Date
MW-03 Dissolved Phase Toluene Concentration Versus Time
Toluene
Linear (Toluene)
0
500
1,000
1,500
2,000
2,500
3,000
Ethylbenzene (ug/L)Date
MW-03 Dissolved Phase Ethylbenzene Concentration Versus Time
Ethylbenzene
Linear
(Ethylbenzene)
0
2,000
4,000
6,000
8,000
10,000
12,000
14,000
Total Xylenes (ug/L)Date
MW-03 Dissolved Phase Total Xylenes Concentration Versus Time
Xylenes
Linear (Xylenes)
0
200
400
600
800
1000
1200
1400
Napthalene (ug/L)Date
MW-03 Dissolved Phase Napthalene Concentration Versus Time
Napthalene
Linear (Napthalene)
0
5,000
10,000
15,000
20,000
25,000
30,000
MTBE (ug/L)Date
MW-03 Dissolved Phase MTBE Concentration Versus Time
MTBE
Linear (MTBE)