WS-4593_14899_CA_MRP_20221111

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

November 11, 2022

Ms. Christina Schroeter
North Carolina Department of Environmental Quality
Winston-Salem Regional Office
Division of Waste Management-UST Section
450 West Hanes Mill Road
Winston-Salem, North Carolina 27105

Subject: Groundwater Monitoring Report
Former Conoco Store #33075 (RM #6143)
3488 Robinhood Road
Winston Salem, Forsyth County, North Carolina
Incident No. 14899
ATC Project No.: P666143707

Dear Ms. Schroeter:

ATC Associates of North Carolina, P.C., on behalf of Phillips 66 Company, is submitting this Groundwater
Monitoring Report for the Former Conoco Store #33075 located in Winston Salem, North Carolina. The
report summarizes laboratory analytical results for the groundwater-sampling event conducted in August
2022.

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

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

Laura I. de Sousa Gabriel Araos, P.E.
Staff Scientist Branch Manger
Direct Line: 919-948-3554 Direct Line: 919-573-1205
Email: [e-mail] Email: [e-mail]

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

Prepared for:

PHILLIPS 66 COMPANY

GROUNDWATER MONITORING REPORT
3488 ROBINHOOD ROAD
WINSTON SALEM, NORTH CAROLINA

NCDEQ INCIDENT NO. 14899

ATC Project No. P666143707

Prepared by:

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

Laura I. de Sousa
Staff Scientist
Direct Line: 919-948-3554
Email: [e-mail]

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

November 11, 2022

Former Conoco Store #33075 (RM #6143)
November 11, 2022
Page i

ATC Project No. P666143955 Phillips 66 Company
Table of Contents
1.0 SITE IDENTIFICATION .......................................................................................................................... 1
2.0 INTRODUCTION ..................................................................................................................................... 2
3.0 BACKGROUND ...................................................................................................................................... 2
4.0 SITE DESCRIPTION .............................................................................................................................. 3
5.0 GROUNDWATER CHARACTERIZATION ........................................................................................... 3
5.1 GROUNDWATER LEVELS...................................................................................................................................... 3
5.2 GROUNDWATER QUALITY ................................................................................................................................... 4
6.0 CONCLUSIONS AND RECOMMENDATIONS .................................................................................... 4

TABLES:
Table 1 – Groundwater Elevation Data
Table 2 – Groundwater Analytical Data
Table 3 – Historical Groundwater Analytical Data

FIGURES:
Figure 1 – Site Topographic Map
Figure 2 – Site Map
Figure 3 – Site Vicinity Map
Figure 4 – Groundwater Elevation Contour Map
Figure 5 – Other Contaminants of Concern in Groundwater

APPENDICES:
Appendix A – Laboratory Analytical Report

Former Conoco Store #33075 (RM #6143)
November 11, 2022
Page 2 of 4

ATC Proposal (or Project #) No. P666143955 Phillips 66 Company
2.0 INTRODUCTION

ATC Associates of North Carolina, P.C. (ATC) was retained by Phillips 66 Company to conduct site
monitoring activities at the Former Conoco Store #33075 (Incident No. 14899). The site is located at 3488
Robinhood Road in Winston Salem, Forsyth County, North Carolina. The site was formerly a gasoline
station with convenience store but currently operates as a Walgreens pharmacy store. A site topographic
map is presented as Figure 1 and a site map is presented as Figure 2. This report documents groundwater
sampling activities conducted in August 2022.

3.0 BACKGROUND

The site operated as Conoco Store #33075 from May 1969 until February 1989. The underground storage
tank system (UST) consisted of three 10,000-gallon gasoline USTs that were removed in 1989. The site
then operated as Crown Fast Fare #753 with three new 10,000-gallon gasoline USTs and one 4,000-gallon
kerosene UST.

Between July 1995 and January 1996, Brown & Root Environmental conducted a Preliminary Site
Assessment at the site. Direct-push soil samples were collected from seven boring locations around the
UST system and dispenser islands. The soil analytical results indicated exceedances of the Soil-to-Water
Maximum Soil Contaminant Concentrations (MSCCs) in two soil samples. Based on the soil exceedances,
a release was reported to the North Carolina Department of Environmental Quality (NCDEQ) in July 1995.
In December 1995, five groundwater monitoring wells (MW-1, MW-2, MW-3, MW-4 and MWD-5) were
installed at the site.

Between July 1999 and September 2000, Dahl & Associates, Inc. (DAHL) conducted a Phase II Limited
Site Assessment at the site. Two direct-push soil samples were collected and select monitoring wells were
sampled. The Phase II report documented exceedances of the gross contaminant levels (GCLs) for
benzene and 1,2-dibromoethane (EDB) in MW-1.

Between September 2000 and May 2002, EPOCH Environmental Group, LLC conducted Comprehensive
Site Assessment (CSA) activities at the site. Monitoring wells MW-3, MW-4 and MWD-5 were abandoned
due to historical analytical concentrations below the laboratory detection limits and dry water table
conditions. Two new shallow monitoring wells (MW-6 and MW-7) were installed off-site to delineate the
extent of the groundwater plume. The CSA concluded that no water supply wells were located within 1,500
feet of the site and that the site should be ranked intermediate due to the benzene and EDB exceedances
of the GCLs in MW-1. The CSA also documented that the historical soil analytical results were below the
Industrial/Commercial MSCCs but that ethylbenzene, naphthalene and 1,2,4-trimethylbenezene exceeded
the Residential MSCCs.

In March 2003, the property was sold by Winnella Duncan to Robinhood Development Co., LLC. The former
UST system consisting of three 10,000-gallon gasoline USTs and one 4,000-gallon kerosene UST were
removed and building was demolished. An Underground Storage Tank Assessment Report prepared by
Excel Civil & Environmental Associates was submitted to NCDEQ on April 4, 2003. The report documented
that the soils were not impacted by the closed UST system. Subsequently, the property was renovated into
a Walgreens pharmacy. During site renovations, monitoring wells MW-1, MW-2, MW-6, MW-8, and MW-
9D were destroyed. Monitoring well MW-7 was found intact during a subsequent site inspection by ATC.

In September 2003, ATC was retained by ConocoPhillips to continue environmental assessment and
remediation services at the referenced site. ATC installed four new shallow monitoring wells (MW-1 through
MW-4) at the site and performed a groundwater-sampling event in August 2006. ACT submitted a
Groundwater Sampling Report on October 3, 2006.

On May 1, 2012, ConocoPhillips separated into two companies, ConocoPhillips and Phillips 66 Company.
The environmental remediation activities associated with this site are managed by Phillips 66 Company.

Former Conoco Store #33075 (RM #6143)
November 11, 2022
Page 3 of 4

ATC Proposal (or Project #) No. P666143955 Phillips 66 Company
ATC submitted a Groundwater Monitoring Report on July 11, 2012, documenting groundwater sampling
activities and an updated receptor survey. Based on the updated receptor survey there are no surface
water bodies within 500 feet of the site and there are no water supply wells within 1,000 feet of the site.
The site was classified as an intermediate risk site due to the presence of benzene above the GCLs for
groundwater. A site vicinity map is included as Figure 3.

ATC performed subsequent sampling events in January 2013 and July 2013 and Aggressive Fluid Vapor
Extraction (AFVR) events in April, May and June 2013. The AFVR events were performed in order to
reduce the GCLs in monitoring well MW-1.

ATC submitted a Groundwater Monitoring Report on February 25, 2014, documenting groundwater-
sampling activities. Benzene concentrations in MW-1 exceeded the GCLs and the site met the criteria for
Intermediate risk.

Groundwater assessment activities were not performed at the site between 2014 and April due to site
access delays with the current property owner.

ATC submitted a Groundwater Monitoring Report on June 10, 2021, documenting groundwater-sampling
activities. Several volatile organic compounds were reported at concentrations in exceeding the 2L
Standards in MW-1 but were below the GCLs. The site was previously ranked intermediate due to GCL
exceedances in MW-1. Based on the reported constituent concentrations, the site was a candidate for
closure and ATC recommended conducting a confirmatory sampling event in August 2021.

ATC Submitted a Groundwater Monitoring Report on January 4, 2022, documenting groundwater-sampling
activities conducted in September and October 2021. Laboratory analytical results from groundwater
samples during the event revealed several volatile organic compounds (VOCs) reported at concentrations
exceeding the 2L Groundwater Standards in monitoring well MW-1. In addition, the 1,2-Dibromoethane
concentration revealed in well MW-1 exceeded the corresponding GCL.

ATC performed a groundwater sampling event in April 2022. Laboratory analytical results from groundwater
samples during the event revealed several volatile organic compounds (VOCs) reported at concentrations
exceeding the 2L Groundwater Standards in monitoring well MW-1. Based on the results of the groundwater
sampling event, ATC recommended continued sampling of the monitoring well network to monitor plume
stability.

4.0 SITE DESCRIPTION

The site is currently operated as a Walgreens pharmacy. No USTs are currently located on the property.

5.0 GROUNDWATER CHARACTERIZATION

5.1 GROUNDWATER LEVELS

Groundwater levels were measured in monitoring wells MW-1, MW-2, MW-4, and MW-7 on August 30,
2022. MW-3 could not be located during previous sampling events and is assumed destroyed. Depth to
water was measured from the top of each well casing. Monitoring well construction details are included in
Table 1. The depth to groundwater across the site during the August 30, 2022, sampling event ranged from
22.22 feet below ground surface (bgs) in MW-7 to 32.41 feet bgs in MW-2. Light non-aqueous phase liquid
(LNAPL) was not encountered during the sampling event. Groundwater elevations for the sampling event
are listed in Table 1. A groundwater elevation contour map based on the August 30, 2022, sampling event
is included as Figure 4. The inferred groundwater flow direction within the surficial aquifer at the site is to
the southwestern direction.

Former Conoco Store #33075 (RM #6143)
November 11, 2022
Page 4 of 4

ATC Proposal (or Project #) No. P666143955 Phillips 66 Company
5.2 GROUNDWATER QUALITY

ATC collected groundwater samples from MW-1, MW-2, MW-4, and MW-7 on August 30, 2022.
Groundwater samples were collected using a dedicated polyethylene disposable bailer. Prior to sampling,
a minimum of three well volumes of groundwater were removed from each monitoring well. Groundwater
samples were collected into laboratory-approved containers, packed in ice and delivered under chain-of-
custody protocol to SGS Laboratories in Scott, Louisiana for analysis. Groundwater samples were analyzed
for volatile organic compounds (VOCs) via EPA Method 6200B and EPA Method 504.1. A copy of the
laboratory analytical report is included in Appendix A.

Groundwater quality results exceeded the NCDEQ Groundwater Quality 2L Standards for the following
constituents and monitoring well locations:

• Benzene (2L Standard of 1 µg/L) in well MW-1 (3,080 µg/L)
• Benzene (2L Standard of 1 µg/L) in well MW-7 (3.4 µg/L)
• Toluene: (2L Standard of 600 µg/L) in well MW-1 (43,800 µg/L)
• Ethylbenzene: (2L Standard of 600 µg/L) in well MW-1 (2,440 µg/L)
• Total Xylenes: (2L Standard of 500 µg/L l) in well MW-1 (15,200 µg/L)
• Naphthalene: (2L Standard of 6 µg/L) in well MW-1 (726 µg/L)
• n-Propylbenzene: (2L Standard of 70 µg/L) in well MW-1 (187J µg/L)
• 1,1,2-Trichloroethane: (2L Standard of 0.6 µg/L) in well MW-1 (121J µg/L)
• 1,2,4-Trimethylbenzene: (2L Standard of 400 µg/L) in well MW-1 (1,670 µg/L)
• 1,2-Dibromoethane: (2L Standard of 0.02 µg/L) in well MW-1 (63.8 µg/L)

1,2-Dibromoethane (63.8 µg/L) was detected and exceeds the GCLs in MW-1 during the August 30, 2022,
sampling event. Constituents reported with “J” values indicate estimated values below the standard
reporting limits. Groundwater analytical results for the August 2022 sampling event are summarized in
Table 2, and historical groundwater analytical results are summarized in Table 3. Figure 5 illustrates the
groundwater sample locations and a summary of the laboratory analytical results.

6.0 CONCLUSIONS AND RECOMMENDATIONS

ATC has performed groundwater assessment activities at the Former Conoco Store #33075 in Winston
Salem, North Carolina. The purpose of the groundwater-sampling event was to confirm if the dissolved
constituent concentrations were below their respective GCL standards. Based on field activities,
observations, and groundwater analytical results, ATC concludes the following:

 The site was formerly a gasoline station with convenience store but currently operates as a Walgreens
pharmacy store;

 Historical soil analytical results indicated that ethylbenzene, naphthalene and 1,2,4-trimethylbenezene
exceeded the Residential MSCCs but were below the Industrial/Commercial MSCCs;

 Based on previous receptor surveys, there are no surface water bodies within 500 feet of the site and
there are no water supply wells within 1,000 feet of the site. The site was previously ranked
intermediate due to GCL exceedances in MW-1;

 The groundwater flow at the site within the surficial aquifer is in the southwestern direction. LNAPL was
not encountered during the August 2022 sampling event; and

 Several petroleum constituents were reported at concentrations exceeding the 2L Groundwater
Standards in monitoring well MW-1. 1,2-Dibromoethane concentrations in MW-1 exceed the CGLs.

Former Conoco Store #33075 (RM #6143)
November 11, 2022
Page 5 of 4

ATC Proposal (or Project #) No. P666143955 Phillips 66 Company
Based on the results of the August 2022 groundwater-sampling event, ATC recommends continued
sampling of the monitoring well network to monitor plume stability. If VOC concentrations remain stable,
the site is a candidate for site closure.

ATC Project No. P666143955 Phillips 66 Company
TABLES

Former Conoco Store #33075 (RM #6143)
TABLE 1
GROUNDWATER ELEVATION DATA
FORMER CONOCO STORE #33075 (RM #6143)
3488 ROBINHOOD ROAD
WINSTON SALEM, NORTH CAROLINA
4/22/2021 27.50 920.54
9/3/2021 28.42 919.62
10/13/2021 28.61 919.43
4/6/2022 29.21 918.83
8/30/2022 30.36 917.68
4/22/2021 29.58 919.43
9/3/2021 33.50 915.51
10/13/2021 30.78 918.23
4/6/2022 31.53 917.48
8/30/2022 32.41 916.60
4/22/2021 NM NM
9/3/2021 NM NM
10/13/2021 NM NM
4/6/2022 NM NM
4/22/2021 28.66 920.58
9/3/2021 29.05 920.19
10/13/2021 29.37 919.87
4/6/2022 30.32 918.92
8/30/2022 30.98 918.26
4/22/2021 19.07 919.84
9/3/2021 20.28 918.63
10/13/2021 20.75 918.16
4/6/2022 20.73 918.18
8/30/2022 22.22 916.69
Notes:
1. TOC = Top of casing.
2. ATC could not locate monitoring well MW-3.
3. NM = Not Measured.
Depth to Water
(feet)
Groundwater
Elevation (feet)Well Construction
Date
Well Diameter
(inches)
Slot Size
(inches)
948.93MW-3 8/10/2006 2
Total Well
Depth (feet)
Screen Interval
(feet)Date Measured TOC Elevation
(feet)
4. Depth to groundwater measured from top of casing.
MW-4 8/11/2006
0.010 40 20-40
40 20-40 949.01
MW-1 8/10/2006 2 0.010 40 20-40
MW-7 1/8/2002 2 0.010 37
948.04
MW-2 8/11/2006 2 0.010
25-37 938.91
2 0.010 40 20-40 949.24
Page 1 of 1
TABLE 2
GROUNDWATER ANALYTICAL DATA
FORMER CONOCO STORE #33075 (RM #6143)
3488 ROBINHOOD ROAD
WINSTON SALEM, NORTH CAROLINA
504.1
Monitoring
Well Date
BenzeneTolueneEthylbenzeneXylene (total)BTEXMethyl Tert Butyl EtherDi-Isopropyl EtherNaphthaleneAcetoneIsopropylbenzeneEthanoln-Propylbenzene1,1,2-Trichloroethane1,2,4-Trimethylbenzene1,3,5-Trimethylbenzene1,2-Dibromoethane1 600 600 500 NE 20 70 6 6,000 70 4,000 70 0.6 400 400 0.02
5,000 260,000 80,000 50,000 NE 20,000 70,000 6,000 6,000,000 30,500 4,000,000 26,100 600 28,500 24,100 50
MW-1 8/30/2022 3,080 43,800 2,440 15,200 64,520 <250 <250 726 855 J <250 <25000 187 J 121 J 1,670 377 63.8
MW-2 8/30/2022 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <10 <0.50 11.4 J <0.50 <0.30 <0.50 <0.50 <0.020
MW-4 8/30/2022 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <10 <0.50 <50 <0.50 <0.30 <0.50 <0.50 <0.021
MW-7 8/30/2022 3.4 <0.50 <0.50 0.34 J 3.74 2.8 0.29 J 0.30 J <10 0.20 J <50 <0.50 <0.30 <0.50 <0.50 <0.021
Notes:
1. "<" or ND = Not detected at or above the laboratory detection limit.
2. Concentrations are reported in micrograms per liter (µg/l) = parts per billion.
3. 2L Standard = Title 15A NCAC 2L .0202 Groundwater Standard.
4. Concentrations in BOLD print equal or exceed the NCDEQ 2L Standard (2L).
5. Concentrations in Italics exceed GCLs.
6. GCL = GCL = Gross Contaminant Level established by NCDEQ.
7. NE = Not Established.
8. BTEX = Benzene, Toluene, Ethylbenzene, and Total Xylenes.
2L Standard
GCL
6200BAnalytical Method:
Page 1 of 1
TABLE 3
HISTORICAL GROUNDWATER ANALYTICAL DATA
FORMER CONOCO STORE #33075 (RM #6143)
3488 ROBINHOOD ROAD
WINSTON SALEM, NORTH CAROLINA
Ethyl-Total Total
benzene Xylenes BTEX
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
8/25/2006 8,800 27,000 1,900 11,000 48,700 960 33 890 68
5/10/2012 6,300 30,000 2,300 12,800 51,400 480 30 750 27
1/10/2013 5,600 25,000 2,100 11,400 44,100 420 <100 550 <100
7/9/2013 4,600 22,000 1,800 9,600 38,000 230 16J 510 17J
11/21/2013 6,700 37,000 2,500 13,900 60,100 310 <100 660 34J
4/22/2021 763 9,050 1,540 8,730 20,083 <100 <100 440 <100
9/3/2021 2,640 35,400 2,310 12,700 53,050 75.8 J <100 842 57.9 J
10/13/2021 NA NA NA NA NA NA NA NA 84.2*
4/6/2022 1,390 12,100 1,430 7,890 22,810 <100 <100 299 6.3*
8/30/2022 3,080 43,800 2,440 15,200 64,520 <250 <250 726 63.8*
8/25/2006 <0.5 <0.7 <0.8 <0.8 ND <0.5 <0.8 <1 <1
6/12/2012 <0.5 <0.5 <0.5 <0.5 ND <0.5 <0.5 <0.5 <0.5
1/10/2013 <0.5 <0.5 <0.5 <0.5 ND <0.5 <0.5 <0.5 <0.5
7/9/2013 <0.5 <0.5 <0.5 <0.5 ND <0.5 <0.5 <0.5 <0.5
11/21/2013 <0.5 <0.5 <0.5 <0.5 ND <0.5 <0.5 <0.5 <0.5
4/22/2021 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
9/3/2021 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
10/13/2021 NA NA NA NA NA NA NA NA <0.020*
4/6/2022 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.020*
8/30/2022 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.020
8/25/2006 0.8 4 <0.8 0.8 4.8 <0.5 <0.8 <1 <1
6/12/2012
1/10/2013
7/9/2013
11/21/2013
4/22/2021
9/3/2021
10/13/2021
4/6/2022
Notes:
1. "<" or ND = Not detected at or above the laboratory detection limit.
2. Concentrations are reported in micrograms per liter (µg/l) = parts per billion.
3. 2L Standard = Title 15A NCAC 2L .0202 Groundwater Standard.
4. Concentrations in BOLD print equal or exceed the NCDEQ 2L Standard (2L).
5. Concentrations in Italics exceed GCLs.
6. EDB = Ethylene dibromide (1,2-dibromoethane).
7. GCL = Gross Contaminantion Level are referenced in the "Guidelines for Assessment and Corrective Action", dated October 2020.
8. NE = Not Established.
9. BTEX = Benzene, Toluene, Ethylbenzene, and Total Xylenes.
10. MTBE = Methyl Tertiary Butyl Ether.
11. IPE = Isopropyl Ether.
12. NA = Not Analyzed.
13. J = Concentration detected below reporting limit.
14. * = Sample analyzed by Method 504.1 (EDB)
Not Sampled/Could Not Locate
Date
Not Sampled/Could Not Locate
Toluene MTBE
Not Sampled/Could Not Locate
MW-2
Not Sampled/Could Not Locate
IPEMonitoring Well
Not Sampled/Could Not Locate
Not Sampled/Could Not Locate
NaphthaleneBenzene
MW-1
2L Standard
GCL
MW-3
EDB
Not Sampled/Could Not Locate
Not Sampled/Could Not Locate
Page 1 of 2
TABLE 3
HISTORICAL GROUNDWATER ANALYTICAL DATA
FORMER CONOCO STORE #33075 (RM #6143)
3488 ROBINHOOD ROAD
WINSTON SALEM, NORTH CAROLINA
Ethyl-Total Total
benzene Xylenes BTEX
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
Date Toluene MTBE IPEMonitoring Well NaphthaleneBenzene
2L Standard
GCL
EDB
1/10/2013 <0.5 <0.5 <0.5 <0.5 ND <0.5 <0.5 <0.5 <0.5
7/9/2013 <0.5 <0.5 <0.5 <0.5 ND <0.5 <0.5 <0.5 <0.5
11/21/2013 <0.5 <0.5 <0.5 <0.5 ND <0.5 <0.5 <0.5 <0.5
4/22/2021 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
9/3/2021 <0.50 <0.50 <0.50 <0.50 ND <0.50 <0.50 <0.50 <0.50
10/13/2021 NA NA NA NA NA NA NA NA <0.020*
4/6/2022 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.020*
8/30/2022 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.021*
1/24/2002 500 9.7 5.1 150 664.8 <25 <25 NA <0.02
6/4/2002 430 10 <10 140 580 <50 <50 NA <0.02
8/13/2002 450 13 9.2 190 662.2 560 <25 NA <0.02
8/25/2006 660 16 28 440 1,144 150 10 36 <1
5/10/2012 240 <2.5 0.6J 76 316.6 39 2.6 19 <2.5
1/10/2013 220 <2.5 <2.5 29.3 249.3 29 <2.5 14 <2.5
7/9/2013 8.1 <0.5 <0.5 4.8 12.9 23 1.4 1.3 <0.5
11/21/2013 29 <0.5 0.1J 9.5 38.6 17 1.1 3.6 <0.5
4/22/2021 <0.50 <0.50 <0.50 <0.50 ND 4.1 <0.50 <0.50 <0.50
9/3/2021 2.8 <0.50 <0.50 0.32 J 3.1 3.3 0.30 J 0.28 J <0.50
10/13/2021 NA NA NA NA NA NA NA NA <0.020*
4/6/2022 <0.50 <0.50 <0.50 <0.50 <0.50 3 <0.50 <0.50 <0.020*
8/30/2022 3.4 <0.50 <0.50 0.34 J 3.74 2.8 0.29 J 0.30 J <0.021*
Notes:
1. "<" or ND = Not detected at or above the laboratory detection limit.
2. Concentrations are reported in micrograms per liter (µg/l) = parts per billion.
3. 2L Standard = Title 15A NCAC 2L .0202 Groundwater Standard.
4. Concentrations in BOLD print equal or exceed the NCDEQ 2L Standard (2L).
5. Concentrations in Italics exceed GCLs.
6. EDB = Ethylene dibromide (1,2-dibromoethane).
7. GCL = Gross Contaminantion Level are referenced in the "Guidelines for Assessment and Corrective Action", dated October 2020.
8. NE = Not Established.
9. BTEX = Benzene, Toluene, Ethylbenzene, and Total Xylenes.
10. MTBE = Methyl Tertiary Butyl Ether.
11. IPE = Isopropyl Ether.
12. NA = Not Analyzed.
13. J = Concentration detected below reporting limit.
14. * = Sample analyzed by Method 504.1 (EDB)
MW-7
MW-4
Page 2 of 2

ATC Project No. P666143955 Phillips 66 Company
FIGURES

Former Conoco Store #33075 (RM #6143)
2725 E. Millbrook Road, Suite 121
Raleigh, NC 27604
[phone]
FIGURE 1:
SITE TOPOGRAPHIC MAP
PROJECT NO: 45.75118.6143
REVIEWED BY:GA SCALE: NTS DATE: 08/2022
FORMER CONOCO STORE #33075 (RM #6143)
3488 ROBINHOOD ROAD
WINSTON SALEM, NORTH CAROLINA
NCDENR INCIDENT No. 14899
SOURCE:USGS 7.5’ WINSTON SALEM-WEST QUADRANGLE, NC. CREATED IN 1950, UPDATED 1994.
SITE
N
ROBINHOOD ROADLEINBACH PLAZA DRIVESCALE: 1" = 40'40010203040NROBINHOODMEDICALPLAZAKANGAROOEXPRSSTEDDY G'SGRILLBANKVACANTWALGREENSFORMERBUILINGFORMERCANOPYFORMERUSTMW-1MW-4MW-3MW-2MW-7LEGEND:SITE PROPERTY LINENOTE: ALL LOCATIONS ARE APPROXIMATEPARCEL LINEMW-1MONITORING WELLWell IdentificationFigure:Drawing File:
Project Number:
Ckd. By:
Drn. By:
App'd By:
Ckd. Date:Scale:Date:H:\2021\OTHER OFFICES\NORTH CAROLINA\NCDEQ-STATE LEAD\PHILLIP 66\RM #6143\P666143707-SITE.DWG, FIG2
SITE MAP11/22/2021SEE LOWER LEFTFORMER CONOCO STORE #33075 (RM #6143)
3488 ROBINHOOD ROAD
WINSTON - SALEM, NORTH CAROLINA
P666143707AS SHOWNDH
CH2NOTES:
1.Features shown are not an authoritative location, nor are they presented
to a stated accuracy.
COORDINATE SYSTEM:
NAD 1983 NORTH CAROLINA STATE PLANE FIPS 3200, US SURVEY FEET
2725 E. Millbrook Road, Suite 121
Raleigh, NC 27604
[phone]
FIGURE 3:
SITE VICINITY MAP
PROJECT NO: 45.75118.6143
REVIEWED BY:GA SCALE: 1” = 333’DATE: 08/2022
FORMER CONOCO STORE #33075 (RM #6143)
3488 ROBINHOOD ROAD
WINSTON SALEM, NORTH CAROLINA
NCDENR INCIDENT No. 14899
SOURCE: Forsyth County GIS
N
Water Supply Well
500 Foot Radius
1,000 Foot Radius
SITE
ROBINHOOD ROADLEINBACH PLAZA DRIVESCALE: 1" = 40'40010203040NROBINHOODMEDICALPLAZAKANGAROOEXPRSSTEDDY G'SGRILLBANKVACANTWALGREENSFORMERBUILINGFORMERCANOPYFORMERUSTMW-1MW-4MW-3MW-2MW-7LEGEND:SITE PROPERTY LINENOTE: ALL LOCATIONS ARE APPROXIMATEPARCEL LINE917.5GROUNDWATER ELEVATION CONTOUR(DASHED WHERE INFERRED) (ft)GROUNDWATER FLOW DIRECTIONMW-2918.23MONITORING WELLWell IdentificationRelative Groundwater Elevation (ft)918.26917.68916.69916.60NM918.0917.5917.0Figure:Drawing File:
Project Number:
Ckd. By:
Drn. By:
App'd By:
Ckd. Date:Scale:Date:H:\2022\1 OTHER OFFICES\NORTH CAROLINA\NCDEQ-STATE LEAD\PHILLIP 66\RM #6143\P666143254-POT.DWG, FIG4
GROUNDWATER ELEVATION CONTOUR MAP10/04/2022SEE LOWER LEFTFORMER CONOCO STORE #33075 (RM #6143)
3488 ROBINHOOD ROAD
WINSTON - SALEM, NORTH CAROLINA
P666143254AS SHOWNDH
LS4NOTES:
1.Features shown are not an authoritative location, nor are they presented
to a state d accuracy.
2.Groundwater elevations measured on 08/30/2022.
3.NM = Not Measured
COORDINATE SYSTEM:
NAD 1983 NORTH CAROLINA STATE PLANE FIPS 3200, US SURVEY FEET
ROBINHOOD ROADLEINBACH PLAZA DRIVESCALE: 1" = 40'40010203040NROBINHOODMEDICALPLAZAKANGAROOEXPRSSTEDDY G'SGRILLBANKVACANTWALGREENSFORMERBUILINGFORMERCANOPYFORMERUSTMW-1MW-4MW-3MW-2MW-7LEGEND:SITE PROPERTY LINENOTE: ALL LOCATIONS ARE APPROXIMATEPARCEL LINEMW-1MONITORING WELLWell IdentificationFigure:Drawing File:
Project Number:
Ckd. By:
Drn. By:
App'd By:
Ckd. Date:Scale:Date:H:\2022\1 OTHER OFFICES\NORTH CAROLINA\NCDEQ-STATE LEAD\PHILLIP 66\RM #6143\P666143254-GW.DWG, FIG5
OTHER CHEMICAL OF CONCERN
IN GROUNDWATER10/04/2022SEE LOWER LEFTFORMER CONOCO STORE #33075 (RM #6143)
3488 ROBINHOOD ROAD
WINSTON - SALEM, NORTH CAROLINA
P666143254AS SHOWNDH
LS5NOTES:
1.Features shown are not an authoritative location, nor are they presented
to a stated accuracy.
2.Groundwater samples collected on 08/30/2022.
3.µg/L = microgram per liter
COORDINATE SYSTEM:
NAD 1983 NORTH CAROLINA STATE PLANE FIPS 3200, US SURVEY FEET

ATC Project No. P666143955 Phillips 66 Company
APPENDIX A

LABORATORY ANALYTICAL REPORT

Former Conoco Store #33075 (RM #6143)
09/21/22
Technical Report for
Atlas
RM #6143-Winston-Salem, NC
SGS Job Number: LA82834
Sampling Date: 08/30/22
Report to:
ATC Group Services LLC.
2725 East Millbrook Road Suite 121
Raleigh, NC 27604
[e-mail]; [e-mail]
ATTN: Gabe Araos
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 09/21/22
e-Hardcopy 2.0
Automated Report
37
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 37
LA82834
Table of Contents
-1-
Sections:
Section 1: Sample Summary ...................................................................................................3
Section 2: Summary of Hits ....................................................................................................4
Section 3: Sample Results ........................................................................................................5
3.1: LA82834-1: MW-1 .......................................................................................................6
3.2: LA82834-2: MW-2 .......................................................................................................10
3.3: LA82834-3: MW-4 .......................................................................................................14
3.4: LA82834-4: MW-7 .......................................................................................................18
Section 4: Misc. Forms ............................................................................................................22
4.1: Chain of Custody ...........................................................................................................23
Section 5: MS Volatiles - QC Data Summaries .....................................................................25
5.1: Method Blank Summary ................................................................................................26
5.2: Blank Spike/Blank Spike Duplicate Summary ..............................................................29
5.3: Matrix Spike/Matrix Spike Duplicate Summary ...........................................................32
Section 6: GC Volatiles - QC Data Summaries .....................................................................35
6.1: Method Blank Summary ................................................................................................36
6.2: Blank Spike/Blank Spike Duplicate Summary ..............................................................37 1234562 of 37
LA82834
SGS North America Inc.
Sample Summary
Atlas
Job No:LA82834
RM #6143-Winston-Salem, NC
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
LA82834-1 08/30/22 10:50 CH 09/06/22 AQ Ground Water MW-1
LA82834-2 08/30/22 10:15 CH 09/06/22 AQ Ground Water MW-2
LA82834-3 08/30/22 10:35 CH 09/06/22 AQ Ground Water MW-4
LA82834-4 08/30/22 09:35 CH 09/06/22 AQ Ground Water MW-7
3 of 37
LA828341
Summary of Hits Page 1 of 1
Job Number:LA82834
Account:Atlas
Project:RM #6143-Winston-Salem, NC
Collected:08/30/22
Lab Sample ID Client Sample ID Result/
Analyte Qual RL MDL Units Method
LA82834-1 MW-1
Acetone 855 J 5000 620 ug/l SM 6200B
Benzene 3080 250 140 ug/l SM 6200B
Ethylbenzene 2440 250 100 ug/l SM 6200B
Naphthalene 726 250 50 ug/l SM 6200B
n-Propylbenzene 187 J 250 110 ug/l SM 6200B
Toluene 43800 250 150 ug/l SM 6200B
1,1,2-Trichloroethane 121 J 150 87 ug/l SM 6200B
1,2,4-Trimethylbenzene 1670 250 73 ug/l SM 6200B
1,3,5-Trimethylbenzene 377 250 81 ug/l SM 6200B
m,p-Xylene 10000 500 170 ug/l SM 6200B
o-Xylene 5210 250 74 ug/l SM 6200B
Xylene (total)15200 250 81 ug/l SM 6200B
1,2-Dibromoethane 63.8 1.0 0.19 ug/l EPA 504.1
LA82834-2 MW-2
Ethyl Alcohol 11.4 J 50 8.4 ug/l SM 6200B
LA82834-3 MW-4
No hits reported in this sample.
LA82834-4 MW-7
Benzene 3.4 0.50 0.27 ug/l SM 6200B
Di-Isopropyl Ether 0.29 J 0.50 0.073 ug/l SM 6200B
Isopropylbenzene 0.20 J 0.50 0.13 ug/l SM 6200B
Methyl Tert Butyl Ether 2.8 0.50 0.068 ug/l SM 6200B
Naphthalene 0.30 J 0.50 0.10 ug/l SM 6200B
o-Xylene 0.34 J 0.50 0.15 ug/l SM 6200B
Xylene (total)0.34 J 0.50 0.16 ug/l SM 6200B
4 of 37
LA828342
SGS North America Inc.
Sample Results
Report of Analysis
Scott, LA
Section 3
5 of 37
LA828343
SGS North America Inc.
Report of Analysis Page 1 of 3
Client Sample ID:MW-1
Lab Sample ID:LA82834-1 Date Sampled:08/30/22
Matrix:AQ - Ground Water Date Received:09/06/22
Method:SM 6200B Percent Solids:n/a
Project:RM #6143-Winston-Salem, NC
File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
Run #1 1Q0144301.D 500 09/12/22 13:21 MB n/a n/a V1Q3126
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 855 5000 620 ug/l J
71-43-2 Benzene 3080 250 140 ug/l
108-86-1 Bromobenzene ND 250 91 ug/l
74-97-5 Bromochloromethane ND 250 61 ug/l
75-27-4 Bromodichloromethane ND 250 90 ug/l
75-25-2 Bromoform ND 250 50 ug/l
104-51-8 n-Butylbenzene ND 250 46 ug/l
135-98-8 sec-Butylbenzene ND 250 71 ug/l
98-06-6 tert-Butylbenzene ND 250 79 ug/l
56-23-5 Carbon Tetrachloride ND 100 46 ug/l
108-90-7 Chlorobenzene ND 250 82 ug/l
75-00-3 Chloroethane ND 250 28 ug/l
67-66-3 Chloroform ND 250 47 ug/l
95-49-8 o-Chlorotoluene ND 250 82 ug/l
106-43-4 p-Chlorotoluene ND 250 100 ug/l
124-48-1 Dibromochloromethane ND 100 37 ug/l
96-12-8 1,2-Dibromo-3-chloropropane ND 250 64 ug/l
106-93-4 1,2-Dibromoethane ND 250 120 ug/l
75-71-8 Dichlorodifluoromethane ND 250 61 ug/l
541-73-1 m-Dichlorobenzene ND 250 32 ug/l
95-50-1 o-Dichlorobenzene ND 250 98 ug/l
106-46-7 p-Dichlorobenzene ND 250 110 ug/l
75-34-3 1,1-Dichloroethane ND 250 52 ug/l
107-06-2 1,2-Dichloroethane ND 100 61 ug/l
75-35-4 1,1-Dichloroethylene ND 250 47 ug/l
156-59-2 cis-1,2-Dichloroethylene ND 250 55 ug/l
156-60-5 trans-1,2-Dichloroethylene ND 250 77 ug/l
78-87-5 1,2-Dichloropropane ND 150 63 ug/l
142-28-9 1,3-Dichloropropane ND 250 100 ug/l
594-20-7 2,2-Dichloropropane ND 250 40 ug/l
563-58-6 1,1-Dichloropropene ND 250 58 ug/l
10061-01-5 cis-1,3-Dichloropropene ND 100 51 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 37
LA8283433.1
SGS North America Inc.
Report of Analysis Page 2 of 3
Client Sample ID:MW-1
Lab Sample ID:LA82834-1 Date Sampled:08/30/22
Matrix:AQ - Ground Water Date Received:09/06/22
Method:SM 6200B Percent Solids:n/a
Project:RM #6143-Winston-Salem, NC
VOA Special List
CAS No.Compound Result RL MDL Units Q
10061-02-6 trans-1,3-Dichloropropene ND 100 28 ug/l
108-20-3 Di-Isopropyl Ether ND 250 37 ug/l
64-17-5 Ethyl Alcohol ND 25000 4200 ug/l
100-41-4 Ethylbenzene 2440 250 100 ug/l
591-78-6 2-Hexanone ND 500 210 ug/l
87-68-3 Hexachlorobutadiene ND 100 55 ug/l
98-82-8 Isopropylbenzene ND 250 66 ug/l
99-87-6 p-Isopropyltoluene ND 250 65 ug/l
74-83-9 Methyl Bromide ND 250 110 ug/l
74-87-3 Methyl Chloride ND 250 33 ug/l
74-95-3 Methylene Bromide ND 250 57 ug/l
75-09-2 Methylene Chloride ND 250 40 ug/l
78-93-3 Methyl Ethyl Ketone ND 13000 140 ug/l
108-10-1 4-Methyl-2-pentanone ND 250 120 ug/l
1634-04-4 Methyl Tert Butyl Ether ND 250 34 ug/l
91-20-3 Naphthalene 726 250 50 ug/l
103-65-1 n-Propylbenzene 187 250 110 ug/l J
100-42-5 Styrene ND 250 63 ug/l
630-20-6 1,1,1,2-Tetrachloroethane ND 250 92 ug/l
79-34-5 1,1,2,2-Tetrachloroethane ND 100 62 ug/l
127-18-4 Tetrachloroethylene ND 250 110 ug/l
108-88-3 Toluene 43800 250 150 ug/l
87-61-6 1,2,3-Trichlorobenzene ND 250 80 ug/l
120-82-1 1,2,4-Trichlorobenzene ND 250 85 ug/l
71-55-6 1,1,1-Trichloroethane ND 250 82 ug/l
79-00-5 1,1,2-Trichloroethane 121 150 87 ug/l J
79-01-6 Trichloroethylene ND 250 90 ug/l
75-69-4 Trichlorofluoromethane ND 250 37 ug/l
96-18-4 1,2,3-Trichloropropane ND 250 11 ug/l
95-63-6 1,2,4-Trimethylbenzene 1670 250 73 ug/l
108-67-8 1,3,5-Trimethylbenzene 377 250 81 ug/l
108-05-4 Vinyl Acetate ND 250 34 ug/l
75-01-4 Vinyl Chloride ND 50 38 ug/l
m,p-Xylene 10000 500 170 ug/l
95-47-6 o-Xylene 5210 250 74 ug/l
1330-20-7 Xylene (total)15200 250 81 ug/l
CAS No.Surrogate Recoveries Run# 1 Run# 2 Limits
17060-07-0 1,2-Dichloroethane-D4 99%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
7 of 37
LA8283433.1
SGS North America Inc.
Report of Analysis Page 3 of 3
Client Sample ID:MW-1
Lab Sample ID:LA82834-1 Date Sampled:08/30/22
Matrix:AQ - Ground Water Date Received:09/06/22
Method:SM 6200B Percent Solids:n/a
Project:RM #6143-Winston-Salem, NC
VOA Special List
CAS No.Surrogate Recoveries Run# 1 Run# 2 Limits
2037-26-5 Toluene-D8 104%70-130%
460-00-4 4-Bromofluorobenzene 111%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 37
LA8283433.1
SGS North America Inc.
Report of Analysis Page 1 of 1
Client Sample ID:MW-1
Lab Sample ID:LA82834-1 Date Sampled:08/30/22
Matrix:AQ - Ground Water Date Received:09/06/22
Method:EPA 504.1 EPA 504 Percent Solids:n/a
Project:RM #6143-Winston-Salem, NC
File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
Run #1 LI136928.D 50 09/15/22 22:15 TA 09/13/22 08:15 OP21361 GLI1206
Run #2
Initial Volume Final Volume
Run #1 35.0 ml 2.0 ml
Run #2
CAS No.Compound Result RL MDL Units Q
106-93-4 1,2-Dibromoethane 63.8 1.0 0.19 ug/l
CAS No.Surrogate Recoveries Run# 1 Run# 2 Limits
348-51-6 1-Chloro-2-fluorobenzene 562% a 70-130%
(a) Outside control limits due to dilution.
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 37
LA8283433.1
SGS North America Inc.
Report of Analysis Page 1 of 3
Client Sample ID:MW-2
Lab Sample ID:LA82834-2 Date Sampled:08/30/22
Matrix:AQ - Ground Water Date Received:09/06/22
Method:SM 6200B Percent Solids:n/a
Project:RM #6143-Winston-Salem, NC
File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
Run #1 1Q0144298.D 1 09/12/22 11:58 MB n/a n/a V1Q3126
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
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
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
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
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
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 37
LA8283433.2
SGS North America Inc.
Report of Analysis Page 2 of 3
Client Sample ID:MW-2
Lab Sample ID:LA82834-2 Date Sampled:08/30/22
Matrix:AQ - Ground Water Date Received:09/06/22
Method:SM 6200B Percent Solids:n/a
Project:RM #6143-Winston-Salem, NC
VOA Special List
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
64-17-5 Ethyl Alcohol 11.4 50 8.4 ug/l J
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
CAS No.Surrogate Recoveries Run# 1 Run# 2 Limits
17060-07-0 1,2-Dichloroethane-D4 99%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 37
LA8283433.2
SGS North America Inc.
Report of Analysis Page 3 of 3
Client Sample ID:MW-2
Lab Sample ID:LA82834-2 Date Sampled:08/30/22
Matrix:AQ - Ground Water Date Received:09/06/22
Method:SM 6200B Percent Solids:n/a
Project:RM #6143-Winston-Salem, NC
VOA Special List
CAS No.Surrogate Recoveries Run# 1 Run# 2 Limits
2037-26-5 Toluene-D8 101%70-130%
460-00-4 4-Bromofluorobenzene 111%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
12 of 37
LA8283433.2
SGS North America Inc.
Report of Analysis Page 1 of 1
Client Sample ID:MW-2
Lab Sample ID:LA82834-2 Date Sampled:08/30/22
Matrix:AQ - Ground Water Date Received:09/06/22
Method:EPA 504.1 EPA 504 Percent Solids:n/a
Project:RM #6143-Winston-Salem, NC
File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
Run #1 LI136910.D 1 09/15/22 10:15 TA 09/13/22 08:15 OP21361 GLI1205
Run #2
Initial Volume Final Volume
Run #1 34.9 ml 2.0 ml
Run #2
CAS No.Compound Result RL MDL Units Q
106-93-4 1,2-Dibromoethane ND 0.020 0.0038 ug/l
CAS No.Surrogate Recoveries Run# 1 Run# 2 Limits
348-51-6 1-Chloro-2-fluorobenzene 99%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
13 of 37
LA8283433.2
SGS North America Inc.
Report of Analysis Page 1 of 3
Client Sample ID:MW-4
Lab Sample ID:LA82834-3 Date Sampled:08/30/22
Matrix:AQ - Ground Water Date Received:09/06/22
Method:SM 6200B Percent Solids:n/a
Project:RM #6143-Winston-Salem, NC
File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
Run #1 1Q0144299.D 1 09/12/22 12:26 MB n/a n/a V1Q3126
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
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
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
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
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
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 37
LA8283433.3
SGS North America Inc.
Report of Analysis Page 2 of 3
Client Sample ID:MW-4
Lab Sample ID:LA82834-3 Date Sampled:08/30/22
Matrix:AQ - Ground Water Date Received:09/06/22
Method:SM 6200B Percent Solids:n/a
Project:RM #6143-Winston-Salem, NC
VOA Special List
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
64-17-5 Ethyl Alcohol ND 50 8.4 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
CAS No.Surrogate Recoveries Run# 1 Run# 2 Limits
17060-07-0 1,2-Dichloroethane-D4 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
15 of 37
LA8283433.3
SGS North America Inc.
Report of Analysis Page 3 of 3
Client Sample ID:MW-4
Lab Sample ID:LA82834-3 Date Sampled:08/30/22
Matrix:AQ - Ground Water Date Received:09/06/22
Method:SM 6200B Percent Solids:n/a
Project:RM #6143-Winston-Salem, NC
VOA Special List
CAS No.Surrogate Recoveries Run# 1 Run# 2 Limits
2037-26-5 Toluene-D8 104%70-130%
460-00-4 4-Bromofluorobenzene 111%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
16 of 37
LA8283433.3
SGS North America Inc.
Report of Analysis Page 1 of 1
Client Sample ID:MW-4
Lab Sample ID:LA82834-3 Date Sampled:08/30/22
Matrix:AQ - Ground Water Date Received:09/06/22
Method:EPA 504.1 EPA 504 Percent Solids:n/a
Project:RM #6143-Winston-Salem, NC
File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
Run #1 LI136911.D 1 09/15/22 10:53 TA 09/13/22 08:15 OP21361 GLI1205
Run #2
Initial Volume Final Volume
Run #1 33.5 ml 2.0 ml
Run #2
CAS No.Compound Result RL MDL Units Q
106-93-4 1,2-Dibromoethane ND 0.021 0.0040 ug/l
CAS No.Surrogate Recoveries Run# 1 Run# 2 Limits
348-51-6 1-Chloro-2-fluorobenzene 103%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 37
LA8283433.3
SGS North America Inc.
Report of Analysis Page 1 of 3
Client Sample ID:MW-7
Lab Sample ID:LA82834-4 Date Sampled:08/30/22
Matrix:AQ - Ground Water Date Received:09/06/22
Method:SM 6200B Percent Solids:n/a
Project:RM #6143-Winston-Salem, NC
File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
Run #1 1Q0144300.D 1 09/12/22 12:53 MB n/a n/a V1Q3126
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
71-43-2 Benzene 3.4 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
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
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
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
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
18 of 37
LA8283433.4
SGS North America Inc.
Report of Analysis Page 2 of 3
Client Sample ID:MW-7
Lab Sample ID:LA82834-4 Date Sampled:08/30/22
Matrix:AQ - Ground Water Date Received:09/06/22
Method:SM 6200B Percent Solids:n/a
Project:RM #6143-Winston-Salem, NC
VOA Special List
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 0.29 0.50 0.073 ug/l J
64-17-5 Ethyl Alcohol ND 50 8.4 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 0.20 0.50 0.13 ug/l J
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 2.8 0.50 0.068 ug/l
91-20-3 Naphthalene 0.30 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 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 0.34 0.50 0.15 ug/l J
1330-20-7 Xylene (total)0.34 0.50 0.16 ug/l J
CAS No.Surrogate Recoveries Run# 1 Run# 2 Limits
17060-07-0 1,2-Dichloroethane-D4 100%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
19 of 37
LA8283433.4
SGS North America Inc.
Report of Analysis Page 3 of 3
Client Sample ID:MW-7
Lab Sample ID:LA82834-4 Date Sampled:08/30/22
Matrix:AQ - Ground Water Date Received:09/06/22
Method:SM 6200B Percent Solids:n/a
Project:RM #6143-Winston-Salem, NC
VOA Special List
CAS No.Surrogate Recoveries Run# 1 Run# 2 Limits
2037-26-5 Toluene-D8 107%70-130%
460-00-4 4-Bromofluorobenzene 112%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
20 of 37
LA8283433.4
SGS North America Inc.
Report of Analysis Page 1 of 1
Client Sample ID:MW-7
Lab Sample ID:LA82834-4 Date Sampled:08/30/22
Matrix:AQ - Ground Water Date Received:09/06/22
Method:EPA 504.1 EPA 504 Percent Solids:n/a
Project:RM #6143-Winston-Salem, NC
File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
Run #1 LI136912.D 1 09/15/22 11:33 TA 09/13/22 08:15 OP21361 GLI1205
Run #2
Initial Volume Final Volume
Run #1 33.5 ml 2.0 ml
Run #2
CAS No.Compound Result RL MDL Units Q
106-93-4 1,2-Dibromoethane ND 0.021 0.0040 ug/l
CAS No.Surrogate Recoveries Run# 1 Run# 2 Limits
348-51-6 1-Chloro-2-fluorobenzene 87%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
21 of 37
LA8283433.4
SGS North America Inc.
Misc. Forms
Custody Documents and Other Forms
Includes the following where applicable:
• Chain of Custody
Scott, LA
Section 4
22 of 37
LA828344
LA82834: Chain of Custody
Page 1 of 2
23 of 37
LA8283444.1
LA82834: Chain of Custody
Page 2 of 2
24 of 37
LA8283444.1
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
25 of 37
LA828345
Method Blank Summary Page 1 of 3
Job Number:LA82834
Account:ATCNCR Atlas
Project:RM #6143-Winston-Salem, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
V1Q3126-MB1 1Q0144297.D 1 09/12/22 MB n/a n/a V1Q3126
The QC reported here applies to the following samples:Method: SM 6200B
LA82834-1, LA82834-2, LA82834-3, LA82834-4
CAS No.Compound Result RL MDL Units Q
67-64-1 Acetone ND 10 1.2 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
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
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
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
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
64-17-5 Ethyl Alcohol ND 50 8.4 ug/l
100-41-4 Ethylbenzene ND 0.50 0.20 ug/l
26 of 37
LA8283455.1.1
Method Blank Summary Page 2 of 3
Job Number:LA82834
Account:ATCNCR Atlas
Project:RM #6143-Winston-Salem, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
V1Q3126-MB1 1Q0144297.D 1 09/12/22 MB n/a n/a V1Q3126
The QC reported here applies to the following samples:Method: SM 6200B
LA82834-1, LA82834-2, LA82834-3, LA82834-4
CAS No.Compound Result RL MDL Units Q
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
27 of 37
LA8283455.1.1
Method Blank Summary Page 3 of 3
Job Number:LA82834
Account:ATCNCR Atlas
Project:RM #6143-Winston-Salem, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
V1Q3126-MB1 1Q0144297.D 1 09/12/22 MB n/a n/a V1Q3126
The QC reported here applies to the following samples:Method: SM 6200B
LA82834-1, LA82834-2, LA82834-3, LA82834-4
CAS No.Surrogate Recoveries Limits
17060-07-0 1,2-Dichloroethane-D4 99%70-130%
2037-26-5 Toluene-D8 105%70-130%
460-00-4 4-Bromofluorobenzene 109%70-130%
28 of 37
LA8283455.1.1
Blank Spike/Blank Spike Duplicate Summary Page 1 of 3
Job Number:LA82834
Account:ATCNCR Atlas
Project:RM #6143-Winston-Salem, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
V1Q3126-BS1 1Q0144294.D 1 09/12/22 MB n/a n/a V1Q3126
V1Q3126-BSD1 1Q0144295.D 1 09/12/22 MB n/a n/a V1Q3126
The QC reported here applies to the following samples:Method: SM 6200B
LA82834-1, LA82834-2, LA82834-3, LA82834-4
Spike BSP BSP BSD BSD Limits
CAS No.Compound ug/l ug/l %ug/l %RPD Rec/RPD
67-64-1 Acetone 50 64.9 130 64.6 129 0 70-130/30
71-43-2 Benzene 20 23.1 116 21.7 109 6 70-130/30
108-86-1 Bromobenzene 20 21.8 109 21.3 107 2 70-130/30
74-97-5 Bromochloromethane 20 23.8 119 23.4 117 2 70-130/30
75-27-4 Bromodichloromethane 20 23.6 118 23.3 117 1 70-130/30
75-25-2 Bromoform 20 20.8 104 20.6 103 1 70-130/30
104-51-8 n-Butylbenzene 20 22.8 114 21.8 109 4 70-130/30
135-98-8 sec-Butylbenzene 20 22.9 115 22.0 110 4 70-130/30
98-06-6 tert-Butylbenzene 20 22.4 112 21.1 106 6 70-130/30
56-23-5 Carbon Tetrachloride 20 23.2 116 23.0 115 1 70-130/30
108-90-7 Chlorobenzene 20 21.5 108 21.1 106 2 70-130/30
75-00-3 Chloroethane 20 18.3 92 16.5 83 10 60-140/30
67-66-3 Chloroform 20 21.7 109 21.4 107 1 70-130/30
95-49-8 o-Chlorotoluene 20 22.5 113 21.4 107 5 70-130/30
106-43-4 p-Chlorotoluene 20 22.7 114 21.6 108 5 70-130/30
124-48-1 Dibromochloromethane 20 21.2 106 20.8 104 2 70-130/30
96-12-8 1,2-Dibromo-3-chloropropane 20 18.5 93 18.0 90 3 70-130/30
106-93-4 1,2-Dibromoethane 20 22.6 113 22.7 114 0 70-130/30
75-71-8 Dichlorodifluoromethane 20 21.6 108 21.3 107 1 60-140/30
541-73-1 m-Dichlorobenzene 20 22.0 110 21.0 105 5 70-130/30
95-50-1 o-Dichlorobenzene 20 21.7 109 20.7 104 5 70-130/30
106-46-7 p-Dichlorobenzene 20 21.5 108 20.3 102 6 70-130/30
75-34-3 1,1-Dichloroethane 20 20.9 105 20.3 102 3 70-130/30
107-06-2 1,2-Dichloroethane 20 21.9 110 21.3 107 3 70-130/30
75-35-4 1,1-Dichloroethylene 20 21.0 105 20.8 104 1 70-130/30
156-59-2 cis-1,2-Dichloroethylene 20 21.5 108 21.3 107 1 70-130/30
156-60-5 trans-1,2-Dichloroethylene 20 19.7 99 19.4 97 2 70-130/30
78-87-5 1,2-Dichloropropane 20 22.2 111 21.6 108 3 70-130/30
142-28-9 1,3-Dichloropropane 20 23.0 115 22.7 114 1 70-130/30
594-20-7 2,2-Dichloropropane 20 27.8 139* a 27.2 136* a 2 70-130/30
563-58-6 1,1-Dichloropropene 20 23.3 117 22.8 114 2 70-130/30
10061-01-5 cis-1,3-Dichloropropene 20 21.9 110 21.3 107 3 70-130/30
10061-02-6 trans-1,3-Dichloropropene 20 19.4 97 19.3 97 1 70-130/30
108-20-3 Di-Isopropyl Ether 20 18.2 91 18.0 90 1 70-130/30
64-17-5 Ethyl Alcohol 400 371 93 379 95 2 70-130/30
100-41-4 Ethylbenzene 20 23.3 117 22.8 114 2 70-130/30
* = Outside of Control Limits.
29 of 37
LA8283455.2.1
Blank Spike/Blank Spike Duplicate Summary Page 2 of 3
Job Number:LA82834
Account:ATCNCR Atlas
Project:RM #6143-Winston-Salem, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
V1Q3126-BS1 1Q0144294.D 1 09/12/22 MB n/a n/a V1Q3126
V1Q3126-BSD1 1Q0144295.D 1 09/12/22 MB n/a n/a V1Q3126
The QC reported here applies to the following samples:Method: SM 6200B
LA82834-1, LA82834-2, LA82834-3, LA82834-4
Spike BSP BSP BSD BSD Limits
CAS No.Compound ug/l ug/l %ug/l %RPD Rec/RPD
591-78-6 2-Hexanone 50 56.8 114 56.3 113 1 70-130/30
87-68-3 Hexachlorobutadiene 20 21.7 109 20.9 105 4 70-130/30
98-82-8 Isopropylbenzene 20 23.7 119 22.7 114 4 70-130/30
99-87-6 p-Isopropyltoluene 20 24.3 122 23.1 116 5 70-130/30
74-83-9 Methyl Bromide 20 16.5 83 15.3 77 8 60-140/30
74-87-3 Methyl Chloride 20 18.7 94 18.1 91 3 60-140/30
74-95-3 Methylene Bromide 20 21.0 105 20.2 101 4 70-130/30
75-09-2 Methylene Chloride 20 18.1 91 17.8 89 2 70-130/30
78-93-3 Methyl Ethyl Ketone 50 67.9 136* a 53.8 108 23 70-130/30
108-10-1 4-Methyl-2-pentanone 50 57.4 115 56.0 112 2 70-130/30
1634-04-4 Methyl Tert Butyl Ether 20 20.9 105 21.2 106 1 70-130/30
91-20-3 Naphthalene 20 21.8 109 21.3 107 2 70-130/30
103-65-1 n-Propylbenzene 20 21.5 108 21.1 106 2 70-130/30
100-42-5 Styrene 20 18.5 93 18.2 91 2 70-130/30
630-20-6 1,1,1,2-Tetrachloroethane 20 23.3 117 22.9 115 2 70-130/30
79-34-5 1,1,2,2-Tetrachloroethane 20 23.6 118 22.8 114 3 70-130/30
127-18-4 Tetrachloroethylene 20 16.7 84 16.1 81 4 70-130/30
108-88-3 Toluene 20 22.6 113 22.5 113 0 70-130/30
87-61-6 1,2,3-Trichlorobenzene 20 20.3 102 19.8 99 2 70-130/30
120-82-1 1,2,4-Trichlorobenzene 20 20.4 102 19.8 99 3 70-130/30
71-55-6 1,1,1-Trichloroethane 20 22.6 113 22.9 115 1 70-130/30
79-00-5 1,1,2-Trichloroethane 20 21.9 110 22.1 111 1 70-130/30
79-01-6 Trichloroethylene 20 21.3 107 20.5 103 4 70-130/30
75-69-4 Trichlorofluoromethane 20 18.1 91 17.2 86 5 60-140/30
96-18-4 1,2,3-Trichloropropane 20 20.0 100 19.7 99 2 70-130/30
95-63-6 1,2,4-Trimethylbenzene 20 22.9 115 21.9 110 4 70-130/30
108-67-8 1,3,5-Trimethylbenzene 20 21.3 107 20.5 103 4 70-130/30
108-05-4 Vinyl Acetate 20 21.4 107 20.9 105 2 70-130/30
75-01-4 Vinyl Chloride 20 19.7 99 19.8 99 1 60-140/30
m,p-Xylene 40 51.4 129 50.0 125 3 70-130/30
95-47-6 o-Xylene 20 22.9 115 22.5 113 2 70-130/30
1330-20-7 Xylene (total)60 74.3 124 72.4 121 3 70-130/30
* = Outside of Control Limits.
30 of 37
LA8283455.2.1
Blank Spike/Blank Spike Duplicate Summary Page 3 of 3
Job Number:LA82834
Account:ATCNCR Atlas
Project:RM #6143-Winston-Salem, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
V1Q3126-BS1 1Q0144294.D 1 09/12/22 MB n/a n/a V1Q3126
V1Q3126-BSD1 1Q0144295.D 1 09/12/22 MB n/a n/a V1Q3126
The QC reported here applies to the following samples:Method: SM 6200B
LA82834-1, LA82834-2, LA82834-3, LA82834-4
CAS No.Surrogate Recoveries BSP BSD Limits
17060-07-0 1,2-Dichloroethane-D4 98%102%70-130%
2037-26-5 Toluene-D8 88%88%70-130%
460-00-4 4-Bromofluorobenzene 106%104%70-130%
(a) Outside control limits biased high. Analyte not detected in associated samples.
* = Outside of Control Limits.
31 of 37
LA8283455.2.1
Matrix Spike/Matrix Spike Duplicate Summary Page 1 of 3
Job Number:LA82834
Account:ATCNCR Atlas
Project:RM #6143-Winston-Salem, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
LA82834-1MS 1Q0144314.D 1000 09/12/22 MB n/a n/a V1Q3126
LA82834-1MSD 1Q0144315.D 1000 09/12/22 MB n/a n/a V1Q3126
LA82834-1 1Q0144301.D 500 09/12/22 MB n/a n/a V1Q3126
The QC reported here applies to the following samples:Method: SM 6200B
LA82834-1, LA82834-2, LA82834-3, LA82834-4
LA82834-1 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 855 J 50000 60700 120 50000 59800 118 1 70-130/20
71-43-2 Benzene 3080 20000 28500 127 20000 28800 129 1 70-130/20
108-86-1 Bromobenzene ND 20000 21900 110 20000 21700 109 1 70-130/20
74-97-5 Bromochloromethane ND 20000 23500 118 20000 24100 121 3 70-130/20
75-27-4 Bromodichloromethane ND 20000 23200 116 20000 23800 119 3 70-130/20
75-25-2 Bromoform ND 20000 19900 100 20000 20200 101 1 70-130/20
104-51-8 n-Butylbenzene ND 20000 21300 107 20000 21300 107 0 70-130/20
135-98-8 sec-Butylbenzene ND 20000 21900 110 20000 22500 113 3 70-130/20
98-06-6 tert-Butylbenzene ND 20000 21000 105 20000 21300 107 1 70-130/20
56-23-5 Carbon Tetrachloride ND 20000 22800 114 20000 24300 122 6 70-130/20
108-90-7 Chlorobenzene ND 20000 21700 109 20000 21400 107 1 70-130/20
75-00-3 Chloroethane ND 20000 17000 85 20000 16100 81 5 60-140/20
67-66-3 Chloroform ND 20000 21900 110 20000 23200 116 6 70-130/20
95-49-8 o-Chlorotoluene ND 20000 21400 107 20000 21600 108 1 70-130/20
106-43-4 p-Chlorotoluene ND 20000 21500 108 20000 22000 110 2 70-130/20
124-48-1 Dibromochloromethane ND 20000 20400 102 20000 20800 104 2 70-130/20
96-12-8 1,2-Dibromo-3-chloropropane ND 20000 18000 90 20000 17800 89 1 70-130/20
106-93-4 1,2-Dibromoethane ND 20000 22800 114 20000 23000 115 1 70-130/20
75-71-8 Dichlorodifluoromethane ND 20000 20900 105 20000 23000 115 10 60-140/20
541-73-1 m-Dichlorobenzene ND 20000 21400 107 20000 21400 107 0 70-130/20
95-50-1 o-Dichlorobenzene ND 20000 21200 106 20000 21200 106 0 70-130/20
106-46-7 p-Dichlorobenzene ND 20000 20400 102 20000 20600 103 1 70-130/20
75-34-3 1,1-Dichloroethane ND 20000 21000 105 20000 21800 109 4 70-130/20
107-06-2 1,2-Dichloroethane ND 20000 21800 109 20000 22200 111 2 70-130/20
75-35-4 1,1-Dichloroethylene ND 20000 21700 109 20000 22300 112 3 70-130/20
156-59-2 cis-1,2-Dichloroethylene ND 20000 21500 108 20000 22700 114 5 70-130/20
156-60-5 trans-1,2-Dichloroethylene ND 20000 20200 101 20000 20600 103 2 70-130/20
78-87-5 1,2-Dichloropropane ND 20000 22000 110 20000 22600 113 3 70-130/20
142-28-9 1,3-Dichloropropane ND 20000 23000 115 20000 23200 116 1 70-130/20
594-20-7 2,2-Dichloropropane ND 20000 24500 123 20000 26600 133* a 8 70-130/20
563-58-6 1,1-Dichloropropene ND 20000 23500 118 20000 23800 119 1 70-130/20
10061-01-5 cis-1,3-Dichloropropene ND 20000 20900 105 20000 21600 108 3 70-130/20
10061-02-6 trans-1,3-Dichloropropene ND 20000 18900 95 20000 19300 97 2 70-130/20
108-20-3 Di-Isopropyl Ether ND 20000 13300 67* a 20000 10600 53* a 23* a 70-130/20
64-17-5 Ethyl Alcohol ND 400000 409000 102 400000 360000 90 13 70-130/20
100-41-4 Ethylbenzene 2440 20000 28100 128 20000 27900 127 1 70-130/20
* = Outside of Control Limits.
32 of 37
LA8283455.3.1
Matrix Spike/Matrix Spike Duplicate Summary Page 2 of 3
Job Number:LA82834
Account:ATCNCR Atlas
Project:RM #6143-Winston-Salem, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
LA82834-1MS 1Q0144314.D 1000 09/12/22 MB n/a n/a V1Q3126
LA82834-1MSD 1Q0144315.D 1000 09/12/22 MB n/a n/a V1Q3126
LA82834-1 1Q0144301.D 500 09/12/22 MB n/a n/a V1Q3126
The QC reported here applies to the following samples:Method: SM 6200B
LA82834-1, LA82834-2, LA82834-3, LA82834-4
LA82834-1 Spike MS MS Spike MSD MSD Limits
CAS No.Compound ug/l Q ug/l ug/l %ug/l ug/l %RPD Rec/RPD
591-78-6 2-Hexanone ND 50000 55200 110 50000 53600 107 3 70-130/20
87-68-3 Hexachlorobutadiene ND 20000 20700 104 20000 21200 106 2 70-130/20
98-82-8 Isopropylbenzene ND 20000 23400 117 20000 23400 117 0 70-130/20
99-87-6 p-Isopropyltoluene ND 20000 23200 116 20000 23300 117 0 70-130/20
74-83-9 Methyl Bromide ND 20000 15300 77 20000 15000 75 2 60-140/20
74-87-3 Methyl Chloride ND 20000 18400 92 20000 19100 96 4 60-140/20
74-95-3 Methylene Bromide ND 20000 20600 103 20000 20700 104 0 70-130/20
75-09-2 Methylene Chloride ND 20000 18400 92 20000 18700 94 2 70-130/20
78-93-3 Methyl Ethyl Ketone ND 50000 53700 107 50000 52000 104 3 70-130/20
108-10-1 4-Methyl-2-pentanone ND 50000 56700 113 50000 54100 108 5 70-130/20
1634-04-4 Methyl Tert Butyl Ether ND 20000 21700 109 20000 21900 110 1 70-130/20
91-20-3 Naphthalene 726 20000 22700 110 20000 22400 108 1 70-130/20
103-65-1 n-Propylbenzene 187 J 20000 21200 105 20000 21700 108 2 70-130/20
100-42-5 Styrene ND 20000 18500 93 20000 18300 92 1 70-130/20
630-20-6 1,1,1,2-Tetrachloroethane ND 20000 23400 117 20000 23400 117 0 70-130/20
79-34-5 1,1,2,2-Tetrachloroethane ND 20000 23000 115 20000 22900 115 0 70-130/20
127-18-4 Tetrachloroethylene ND 20000 16600 83 20000 17100 86 3 70-130/20
108-88-3 Toluene 43800 20000 99200 277* b 20000 100000 281* b 1 70-130/20
87-61-6 1,2,3-Trichlorobenzene ND 20000 19800 99 20000 20100 101 2 70-130/20
120-82-1 1,2,4-Trichlorobenzene ND 20000 19900 100 20000 19900 100 0 70-130/20
71-55-6 1,1,1-Trichloroethane ND 20000 22900 115 20000 24400 122 6 70-130/20
79-00-5 1,1,2-Trichloroethane 121 J 20000 22200 110 20000 22200 110 0 70-130/20
79-01-6 Trichloroethylene ND 20000 21200 106 20000 21600 108 2 70-130/20
75-69-4 Trichlorofluoromethane ND 20000 18400 92 20000 17500 88 5 60-140/20
96-18-4 1,2,3-Trichloropropane ND 20000 20100 101 20000 19900 100 1 70-130/20
95-63-6 1,2,4-Trimethylbenzene 1670 20000 25900 121 20000 25800 121 0 70-130/20
108-67-8 1,3,5-Trimethylbenzene 377 20000 21200 104 20000 21400 105 1 70-130/20
108-05-4 Vinyl Acetate ND 20000 21900 110 20000 21100 106 4 70-130/20
75-01-4 Vinyl Chloride ND 20000 19000 95 20000 20600 103 8 60-140/20
m,p-Xylene 10000 40000 74200 161* a 40000 73900 160* a 0 70-130/20
95-47-6 o-Xylene 5210 20000 32200 135* a 20000 32900 138* a 2 70-130/20
1330-20-7 Xylene (total)15200 60000 106000 151* a 60000 107000 153* a 1 70-130/20
* = Outside of Control Limits.
33 of 37
LA8283455.3.1
Matrix Spike/Matrix Spike Duplicate Summary Page 3 of 3
Job Number:LA82834
Account:ATCNCR Atlas
Project:RM #6143-Winston-Salem, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
LA82834-1MS 1Q0144314.D 1000 09/12/22 MB n/a n/a V1Q3126
LA82834-1MSD 1Q0144315.D 1000 09/12/22 MB n/a n/a V1Q3126
LA82834-1 1Q0144301.D 500 09/12/22 MB n/a n/a V1Q3126
The QC reported here applies to the following samples:Method: SM 6200B
LA82834-1, LA82834-2, LA82834-3, LA82834-4
CAS No.Surrogate Recoveries MS MSD LA82834-1 Limits
17060-07-0 1,2-Dichloroethane-D4 103%105%99%70-130%
2037-26-5 Toluene-D8 90%90%104%70-130%
460-00-4 4-Bromofluorobenzene 107%106%111%70-130%
(a) Outside control limits due to matrix interference.
(b) Outside control limits due to high level in sample relative to spike amount.
* = Outside of Control Limits.
34 of 37
LA8283455.3.1
SGS North America Inc.
GC Volatiles
QC Data Summaries
Includes the following where applicable:
• Method Blank Summaries
• Blank Spike Summaries
• Matrix Spike and Duplicate Summaries
Scott, LA
Section 6
35 of 37
LA828346
Method Blank Summary Page 1 of 1
Job Number:LA82834
Account:ATCNCR Atlas
Project:RM #6143-Winston-Salem, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
OP21361-MB LI136906.D 1 09/15/22 TA 09/13/22 OP21361 GLI1205
The QC reported here applies to the following samples:Method: EPA 504.1
LA82834-1, LA82834-2, LA82834-3, LA82834-4
CAS No.Compound Result RL MDL Units Q
106-93-4 1,2-Dibromoethane ND 0.020 0.0038 ug/l
CAS No.Surrogate Recoveries Limits
348-51-6 1-Chloro-2-fluorobenzene 97%70-130%
36 of 37
LA8283466.1.1
Blank Spike/Blank Spike Duplicate Summary Page 1 of 1
Job Number:LA82834
Account:ATCNCR Atlas
Project:RM #6143-Winston-Salem, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
OP21361-BS LI136907.D 1 09/15/22 TA 09/13/22 OP21361 GLI1205
OP21361-BSD LI136908.D 1 09/15/22 TA 09/13/22 OP21361 GLI1205
The QC reported here applies to the following samples:Method: EPA 504.1
LA82834-1, LA82834-2, LA82834-3, LA82834-4
Spike BSP BSP BSD BSD Limits
CAS No.Compound ug/l ug/l %ug/l %RPD Rec/RPD
106-93-4 1,2-Dibromoethane 0.251 0.25 99 0.23 91 8 70-130/20
CAS No.Surrogate Recoveries BSP BSD Limits
348-51-6 1-Chloro-2-fluorobenzene 105%70-130%
348-51-6 1-Chloro-2-fluorobenzene 104%97%70-130%
* = Outside of Control Limits.
37 of 37
LA8283466.2.1