WI0400198_Monitoring (Report)_20230217

Mr. Michael Rogers
UIC Program Manager
NCDEQ — DWR
1636 Mail Service Center
Raleigh, North Carolina 27699
Subject:
2nd Semi -Annual Groundwater Monitoring Report — 2022
Former BP Facility #24163
381 Knollwood Street
Winston-Salem, North Carolina 27103
Incident Number: 6400 (Closed)
Risk Classification: Low (No Further Action)
Dear Mr. Rogers:
PARCADIS Uesign & Consultancy
fornaturaland
built assets
Arcadis U.S., Inc.
111-D Sanders Lane
Bluefield, VA 24605
Tel [phone]
Fax [phone]
www.arcadis.com
ENVIRONMENT
Date:
February 17, 2023
Contact:
On behalf of Atlantic Richfield Company (ARCO), a BP Products North America,
Inc. (BP) affiliated company, Arcadis G&M of North Carolina is submitting the Hardik Patel
attached 2nd Semi -Annual Groundwater Monitoring Report — 2022 for the above
referenced site.
Phone:
Please contact me at [phone] with any questions or concerns related to
the Report or this incident number. 919.328.5605
Sincerely,
Arcadis G&M of North Carolina, Inc.
J4 k /��' 0
Hardik Patel
AFS Project Manager
Copies:
File — BP #24163
Email:
[e-mail]
Our ref:
30143397
(GP16BPNA.NC10)

ARCADIS Design&Consultancy
for naturaand
Built assetls
Atlantic Richfield Company
c/o BP Products North America, Inc.
2ND SEMI-ANNUAL MONITORING
REPORT - 2022
I
Former BP Facility #24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
NCDEQ Incident #6400 (Closed)
Injection Permit #W10400198
February 2023

2nd Semi -Annual Monitoring Report —2022
Hardik Patel
AFS Project Manager
C. Scott Bostian, P.E.
North Carolina P.E. No. 25659
Senior Engineer
`L 1$12-c>l3
2ND SEMI-ANNUAL
MONITORING REPORT
- 2022
Prepared for:
Atlantic Richfield Company
do BP Products North America, Inc.
Mr. Kyle Christie — Project Manager
1919 Mariposa Lane
Fullerton, CA 92833
Tel714.815,8971
Prepared by:
Arcadis G&M of North Carolina, Inc.
5420 Wade Park Blvd.
Suite 350
Raleigh, North Carolina 27607
Tel [phone]
Fax [phone]
%v w arcadis,us,,orn
Environmental
Our Ref.:
30143397
Date:
February 8, 2023
This document is intended only for the use of
the individual or entity for which it was
prepared and may contain information that is
privileged, confidential and exempt from
disclosure under applicable law. Any
dissemination, distribution or copying of this
document is strictly prohibited.
arcadls..com ES-1

2nd Semi -Annual Monitoring Report— 2022
211 Semi -Annual Monitoring Report— 2022
Former BP Facility #24163
381 Knollwood St
Winston-Salem, Forsyth County, North Carolina
Latitude 360 5' 25.94'N Longitude 80017' 11.79"W
(Reference Figure 1 )
Groundwater Incident #: 6400 (Closed)
Risk Classification:
Reason for Risk Classification:
Land Use Category:
Source of Release:
Date of Release Discovery:
Estimated Quantity of Release:
Cause of Release:
Responsible Parry:
Property Owner:
Tr
Carol3ia, )ha., do certify
my kaowiedge. YJU9adis
7-1
Low (No Further Action)
Dissolved -phase Sulfate
concentrations above
groundwater quality standards
(2L)
Industrial/Commercial
Former gasoline UST system(s)
1983
Unknown
Former UST System
Atlantic Richfield Company
c/o BP Products North America,
Inc.
Attn: Jim Smith
201 Helios Way
Helios Plaza —6"' Floor
Houston, TX 77079
(832)-619-3585
Mr. Charles Sherren
Thruway Shopping Center, LLC.
7501 Wisconsin Ave., Suite 1500
Bethesda, Maryland, 20814
[phone] ext. 215
a Professional Engineer for Arcadis G&M of North
information contained in this report is correct and accurate to the best of
North Carolina, Inc. is licensed to practice geology and engineering in
numbers of the company are C-155 (geology) and C-1869 (engineering).
ES-2

2"d Semi -Annual Monitoring Report — 2022
CONTENTS
1.0 Site History and Characterization ....
2.0 Groundwater Monitoring ...................
2.1 Groundwater Gauging ...............
2.2 Groundwater Sampling ..............
2.3 Groundwater Analytical Results
3.0 Site Remediation ..............................
3.1 Remediation Activities to Date...
4.0 Conclusions and Recommendations
TABLES
Table 1. Monitoring Well Construction Data
Table 2. Groundwater Elevation Data
Table 3. Summary of Groundwater Analytical Data
FIGURES
Figure 1. Site Location Map
Figure 2. Site Map
Figure 3. Potentiometric Surface Map — December 30, 2022
Figure 4. Groundwater Analytical Data — December 30, 2022
Figure 5. Sulfate Isoconcentration Map — December 30, 2022
APPENDICES
A — Historical Groundwater Elevation Data
B — Laboratory Analytical Report and Chain -of -Custody Record — January 12, 2023
C — Historical Groundwater Analytical Data
5
6
6
6
7
7
7
7
arcadis.com ES-3

2"d Semi -Annual Monitoring Report — 2022
EXECUTIVE SUMMARY
On behalf of Atlantic Richfield Company (ARCO), a BP Products North America, Inc. (BP) affiliated
company, Arcadis G&M of North Carolina, Inc. (Arcadis) personnel performed the semi-annual
groundwater sampling of groundwater monitoring wells associated with Former BP Facility #24163 located
at 381 Knollwood Street, in Winston-Salem, Forsyth County, North Carolina (the Site) on December 30,
2022. All groundwater monitoring activities were conducted in response to the final project evaluation
requirement specified in Part VII, Item 5 of the Renewal Issuance of Injection Permit W10400198 from the
North Carolina Department of Environmental Quality (NCDEQ) Division of Water Quality — Aquifer
Protection Section in April 2013.
On December 30, 2022, Arcadis completed a semi-annual groundwater monitoring and sampling event at
the Site. Two (2) groundwater monitoring wells (MW-8R and MW-6) were gauged to determine the depth
to water (DTW). DTW ranged from 12.30 feet below top of casing (btoc) in groundwater monitoring well
MW-6 to 13.15 feet btoc in groundwater monitoring well MW-8R. The historical groundwater flow direction
for the Site is towards the southeast.
On December 30, 2022, groundwater samples were collected from groundwater monitoring wells MW-8R
and MW-6. The maximum concentrations of selected dissolved -phase COCs found during the December
2022 sampling events are summarized in the table below:
Maximum Groundwater Concentrations (December 30, 2022)
Chemical of
Monitoring Well
Concentration
North Carolina
Concern
ID
(mg/L)
Groundwater
(COC)
Quality (2L)
Standards
Sulfate
MW-8R
381
250
Note: Concentration in Bold exceeds the applicable North Carolina GCL Standard
mg/L: milligrams per liter
Dissolved phase sulfate concentrations remained stable compared to historical groundwater analytical
data. Dissolved phase sulfate was detected above the applicable North Carolina Groundwater Quality (2L)
Standard at the groundwater monitoring well MW-8R only.
Arcadis recommends continuing the semi-annual groundwater monitoring and sampling program at the
Site to document the natural attenuation of sulfate. The next semi-annual groundwater monitoring and
sampling event is scheduled for May 2023. Groundwater monitoring wells MW-8R and MW-6 will be
gauged to evaluate the potentiometric surface at the Site. Groundwater samples will be collected from
MW-8R and MW-6 for analysis of sulfate by Standard Method 9056A. A Semi -Annual Groundwater
Monitoring Report documenting the proposed activities for 2023 will be submitted to the NCDEQ for review
and approval within 45-days of receipt of the laboratory analytical report.
arcadis.com ES-4

2nd Semi -Annual Monitoring Report — 2022
1.0 SITE HISTORY AND CHARACTERIZATION
Former BP Facility #24163 is located at 381 Knollwood Street, Winston-Salem, Forsyth County, North
Carolina (the Site). The Site is currently owned by Thruway Shopping Center, LLC. and serves as a
parking lot adjacent to surrounding retail stores. The site property is approximately 0.5 acres, covered by
asphalt and concrete, and was formerly developed as a retail fueling station which housed gasoline,
diesel, waste oil, and kerosene Underground Storage Tanks (USTs). A site location map is presented as
Figure 1 and a site map is shown as Figure 2.
The North Carolina Department of Environmental Quality (NCDEQ) issued groundwater incident number
6400 due to a subsurface release of gasoline that occurred on or before September 14, 1983 from a
ruptured product line associated with the UST system. The quantity of the release remains unknown.
One (1) 10,000-gallon steel gasoline UST, three (3) 6,000-gallon steel gasoline USTs, and one (1)
10,000-gallon steel diesel UST were removed from the site in 1990. Three (3) 10,000-gallon gasoline
USTs, one (1) 10,000-gallon diesel UST, and one (1) 550-gallon waste oil UST were subsequently
installed at the site and the site was purchased by M. M. Fowler, Inc. in January 1994 and continued
operation until 2004. The remaining five USTs were removed before 2005 and the site was razed.
Site geology and hydrogeology include surficial deposits immediately underlying the site are described
generally as sandy silts that grade upward to clayey silts and silty clays. Bedrock beneath the site is
mapped as a strongly foliated biotite gneiss and schist. The maximum depth of investigation at the site
has been approximately 55 feet below ground surface (bgs); bedrock has not been encountered during
site investigation work. Historically, the range for shallow groundwater beneath the site is approximately
11 to 14 feet bgs, and groundwater flow direction is toward the southeast with an apparent horizontal
gradient of approximately 0.012 feet per foot (ft/ft). The calculated groundwater seepage velocity for
shallow groundwater beneath the site is approximately 2.8 feet per year.
Two activated sodium persulfate injections were performed at the Site on June 4 — 9, 2012 and June 3 —
6, 2013 under Underground Injection Control (UIC) Permit #W10400198 which was issued by the NCDEQ
Division of Water Quality on August 9, 2011. Approximately 11,237-gallons of sodium persulfate and
6,826-gallons of sodium persulfate were injected at the Site on June 4 — 9, 2012 and June 3 — 6, 2013,
respectively.
The NCDEQ Risk Classification for this site was reduced to "Low" on January 23, 2015 after issuing a
request for Notice of Residual Petroleum (NORP). The NORP was recorded with the Forsyth County
Register of Deeds on March 18, 2015 and imposed the following perpetual restriction on the Site
property:
• Groundwater: Groundwater from the site is prohibited from use as a water supply. Water supply
wells of any kind shall not be installed or operated on the site.
No Further Action (NFA) status was granted for the subject incident number by the NCDEQ on April 28,
2015.
In accordance with UIC Permit #WI0400198, dissolved -phase concentrations of sulfate are being
monitored on a semi-annual basis at the Site. Closure of UIC Permit #W10400198 will be requested once
arcadis.com

2nd Semi -Annual Monitoring Report — 2022
dissolved -phase sulfate concentrations are no longer detected above the North Carolina Groundwater
Quality (2L) Standards.
2.0 GROUNDWATER MONITORING
2.1 Groundwater Gauging
On December 30, 2022, Arcadis G&M of North Carolina, Inc. (Arcadis) personnel gauged
groundwater monitoring wells MW-8R and MW-6. Gauging was conducted with a water interface
probe (IP) prior to purging and sampling to determine DTB and DTW. The IP and attached tape,
marked in 0.01-foot increments, were properly decontaminated before each use with Alconox
soap and rinsed with distilled water. The DTW was measured from the marked survey point on
the top of well casing (TOC). All measurements were recorded to the nearest 0.01-foot increment.
The DTW ranged from 12.30 btoc in groundwater monitoring well MW-6 to 13.15 feet btoc in
groundwater monitoring well MW-8R.
Groundwater monitoring well construction details are included in Table 1. Current groundwater
elevations are summarized in Table 2. Historical groundwater gauging data is provided in
Appendix A. A potentiometric surface map depicting historical groundwater flow direction is
provided as Figure 3.
2.2 Groundwater Sampling
On December 30, 2022, groundwater monitoring wells MW-8R and MW-6 were purged of
stagnant water to prepare for groundwater sampling. Prior to purging, the amount of water to be
removed was calculated using the following formula:
3.1415 x r2 x (TD-DTW) x 7.481 = gallons of water (1 well volume)
Where: r = radius of well (in feet)
TD = total depth of well (in feet)
DTW = depth to water (in feet)
In order to ensure that the water in the wells after purging is representative of the water in the
aquifer, a minimum of three well volumes were removed.
Groundwater samples obtained from the groundwater monitoring well were collected from
disposable polyethylene bailers using new nylon rope. Groundwater samples were placed in
laboratory supplied containers and shipped on wet ice to TestAmerica Inc. in Pensacola, Florida,
for analysis of Sulfate (SO4) by Standard Method 9056A. Groundwater samples submitted for
sulfate analysis were collected in 250-milliliter plastic bottles.
The laboratory analytical report and chain -of -custody record for December 30, 2022, groundwater
sampling event is included as Appendix B.
arcadis.com 6

2nd Semi -Annual Monitoring Report — 2022
2.3 Groundwater Analytical Results
Groundwater analytical data from the December 30, 2022, groundwater sampling event indicated
the following:
Dissolved -phase concentrations of sulfate were detected in concentrations exceeding the
applicable North Carolina 2L Standard of 250 milligrams per liter (mg/L) in groundwater
monitoring well MW-8R (381 mg/L).
Current groundwater analytical results are presented in Table 3. Historical groundwater analytical
data can be found in Appendix C. A dissolved phase concentration map is presented as Figure
4. A sulfate iso-concentration map depicting the dissolved -phase extent of sulfate exceeding the
applicable 2L groundwater quality standard is presented in Figure 5.
3.0 SITE REMEDIATION
3.1 Remediation Activities to Date
Summarized in the table below is a chronology of remediation activities performed at the site to
date:
Date
Activity
September 14, 1983
Subsurface release of gasoline from a ruptured product line
associated with the UST system
December 1990
UST systems associated with release removed; 500 tons of
contaminated soil removed during UST closure
1992
Vacuum Extraction System Installed
1992 - 1994
Vacuum Extraction System Operation
1994 - 2011
Monitoring of site
June 4 — 9, 2012
Activated Sodium Persulfate (ASP) injection event.
Approximately 11,237-gallons of sodium persulfate injected.
June 3 — 6, 2013
ASP injection event. Approximately 6,826-gallons of sodium
persulfate injected.
2013 - Present
Monitored Natural Attenuation
4.0 CONCLUSIONS & RECOMMENDATIONS
Dissolved -phase sulfate was detected above the applicable 2L groundwater quality standard for
sulfate of 250 mg/L in only groundwater monitoring well MW-8R on December 30, 2022.
arcadis.com

2nd Semi -Annual Monitoring Report — 2022
Arcadis recommends continuing the semi-annual groundwater monitoring and sampling program
at the Site to document the natural attenuation of sulfate. The next semi-annual groundwater
monitoring and sampling event is scheduled for May 2023. Groundwater monitoring wells MW-8R
and MW-6 will be gauged to evaluate the potentiometric surface at the Site. Groundwater
samples will be collected from MW-8R and MW-6 for analysis of sulfate by Standard Method
9056A. A Semi -Annual Groundwater Monitoring Report documenting the proposed activities for
2023 will be submitted to the NCDEQ for review and approval within 45-days of receipt of the
laboratory analytical report.
arcadis.com 8

Tables

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Table 2
Groundwater Elevation Data
Former BIP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
ARCADIS built &Consultancy
farnatu and
built assets
MW-8R 12/30/2022 NS ND 13.15 0.00 NM
MW-6 12/30/2022 98.68 ND 12.30 0.00 86.38
Notes:
1. Measured in feet relative to site datum
2. Corr. GW Elev. _ (ref. point elevation) - (depth to groundwater) + (LNAPL thickness)(LNAPL specific gravity)
3. LNAPL specific gravity assumed to be 0.73
LNAPL = Light non -aqueous phase liquid
ND = Not Detected
NM = Not Measured
NS = Not Surveyed
TOC = Top of casing
btoc = below top of casing
Page 1 of 1

Table 3
Summary of Groundwater Analytical Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, NC
Date Sampled
Units
Sulfate
Notes:
12/30/2022
mg/L
381
ARCADIS Design&consultancy
for natural and
built assets
12/30/2022
mg/L
33.8
mg/L - milligrams per liter
BOLD text indicates exceendance of NC groundwater
standard 2L for sulfate (250 mg/L).
Page 1 of 1

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APPENDIX A
Historical Groundwater Elevation Data

Appendix A
Historical Groundwater Elevation Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
MW-3
MW-5
06/24/93
08/23/94
03/21 /95
08/05/96
11/17/98
06/19/01
09/12/01
12/27/01
03/05/02
05/13/03
12/09/03
03/23/06
05/08/07
05/14/08
05/28/09
05/27/10
10/31/11
05/22/12
06/14/12
07/09/12
08/14/12
nononq
02/26/13
05/31/13
08/28/13
06/02/14
10/16/14
04/23/15
04/28/16
09/19/16
03/03/17
06/24/93
08/23/94
03/21 /95
08/05/96
11/17/98
06/19/01
noi1 9ini
12/09/03
03/23/06
05/08/07
05/14/08
64 ARCADIS built fo,iaatassetvs ,,
ND
13.89
0.00
85.14
ND
14.36
0.00
84.67
ND
13.58
0.00
85.45
ND
13.54
0.00
85.49
ND
14.09
0.00
84.94
ND
14.11
0.00
84.92
ND
14.41
0.00
84.62
ND
14.51
0.00
84.52
ND
14.29
0.00
84.74
ND
14.35
0.00
84.68
ND
13.63
0.00
85.40
ND
13.64
0.00
85.39
ND
13.40
0.00
85.63
ND
13.42
0.00
85.61
ND
13.31
0.00
85.72
ND
13.07
0.00
85.96
ND
13.87
0.00
85.16
99.03
ND
13.55
0.00
85.48
ND
13.53
0.00
85.50
ND
13.98
0.00
85.05
ND
14.24
0.00
84.79
ND
14.08
0.00
84.95
ND
14.42
0.00
84.61
ND
13.55
0.00
85.48
ND
13.58
0.00
85.45
ND
13.57
0.00
85.46
ND
14.30
0.00
84.73
ND
13.28
0.00
85.75
ND
13.34
0.00
85.69
ND
14.18
0.00
84.85
ND
13.54
0.00
85.49
ND
13.51
0.00
85.52
ND
13.92
0.00
85.11
ND
NM
0.00
NM
ND
13.51
0.00
85.88
ND
13.82
0.00
85.57
ND
13.71
0.00
85.68
ND
13.54
0.00
85.85
ND
14.08
0.00
85.31
NM
NM
NM
NM
ND
14.46
0.00
84.93
99.39 14.51
15.07
0.56
84.73
14.45
14.88
0.43
84.82
NM
NM
NM
NM
13.18
13.60
0.42
86.10
ND
13.67
0.00
85.72
ND
13.45
0.00
85.94
ND
13.51
0.00
85.88
ND
13.39
0.00
86.00
Page 1 of 5

Appendix A
Historical Groundwater Elevation Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
MW-5R
MW-6
MW-6i
PARCADIS �i �and"-
huittasses
05/27/10
ND
13.70
0.00
NM
10/31/11
ND
13.97
0.00
NM
05/22/12
ND
13.66
0.00
NM
06/14/12
ND
13.73
0.00
NM
07/09/12
ND
14.18
0.00
NM
08/14/12
ND
14.45
0.00
NM
09/19/12
ND
14.35
0.00
NM
12/05/12
ND
14.68
0.00
NM
02/26/13
ND
13.89
0.00
NM
05/31/13
ND
13.77
0.00
NM
08/28/13
ND
13.83
0.00
NM
11/07/13 NS
ND
14.53
0.00
NM
02/27/14
ND
13.39
0.00
NM
06/02/14
ND
13.47
0.00
NM
10/16/14
ND
14.32
0.00
NM
04/23/15
ND
13.69
0.00
NM
10/13/15
ND
14.19
0.00
NM
04/28/16
ND
13.61
0.00
NM
09/19/16
ND
13.99
0.00
NM
03/03/17
ND
14.01
0.00
NM
09/20/17
ND
13.67
1.00
NM
03/01/18
ND
13.62
0.00
NM
08/20/18
ND
13.61
0.00
NM
06/24/93
ND
12.31
0.00
86.37
08/23/94
ND
12.61
0.00
86.07
03/21/95
ND
13.15
0.00
85.53
08/05/96
ND
12.39
0.00
86.29
11/17/98
ND
13.16
0.00
85.52
06/19/01
NM
NM
NM
NM
09/12/01
ND
13.51
0.00
85.17
12/27/01
ND
13.61
0.00
85.07
03/05/02
ND
11.02
0.00
87.66
05/12/03
ND
11.10
0.00
87.58
12/09/03
ND
13.49
0.00
85.19
03/23/06
ND
11.79
0.00
86.89
98.68
05/08/07
ND
12.50
0.00
86.18
05/14/08
ND
12.16
0.00
86.52
05/28/09
ND
10.64
0.00
88.04
05/27/10
ND
11.84
0.00
86.84
10/31/11
ND
12.95
0.00
85.73
06/02/14
ND
12.38
0.00
86.30
03/25/20
ND
11.50
0.00
87.18
09/01/20
ND
11.80
0.00
86.88
04/02/21
ND
9.55
0.00
89.13
11/16/21
ND
12.44
0.00
86.24
04/06/22
ND
11.65
0.00
87.03
12/30/22
ND
12.30
0.00
86.38
06/24/93
ND
NM
0.00
NM
08/23/94
ND
NM
0.00
NM
03/21/95
ND
14.75
0.00
84.51
08/05/96
ND
14.13
0.00
85.13
11/17/98
ND
14.09
0.00
85.17
06/19/01
ND
18.07
0.00
81.19
09/12/01
ND
16.60
0.00
82.66
12/27/01
ND
14.61
0.00
84.65
03/05/02
ND
14.96
0.00
84.30
05/12/03 99.26
ND
15.17
0.00
84.09
12/09/03
ND
13.55
0.00
85.71
03/23/06
ND
13.55
0.00
85.71
05/08/07
ND
12.93
0.00
86.33
05/14/08
ND
13.22
0.00
86.04
05/28/09
ND
13.39
0.00
85.87
05/27/10
ND
13.23
0.00
86.03
10/31/11
ND
13.90
0.00
85.36
06/02/14
ND
13.35
0.00
85.91
04/28/16
ND
13.55
0.00
85.71
Page 2 of 5

Appendix A
Historical Groundwater Elevation Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
PARCADIS �i �and"-
huittasses
MW 8
08/23/94
03/21/95
08/05/96
11/17/98
06/19/01
09/12/01
12/27/01
03/05/02
05/12/03
12/09/03
03/23/06
05/08/07
05/14/08
05/28/09
05/27/10
ND
ND
ND
ND
NM
ND
97.84 14.47
12.42
NM
13.32
ND
ND
ND
ND
ND
12.14
12.02
11.99
12.53
NM
12.67
15.03
12.60
NM
13.56
12.15
11.90
11.95
11.70
12.97
0.00
0.00
0.00
0.00
NM
0.00
0.56
0.18
NM
0.24
0.00
0.00
0.00
0.00
0.00
85.70
85.82
85.85
85.31
NM
85.17
83.26
85.38
NM
84.47
85.69
85.94
85.89
86.14
NM
10/31/11
ND
13.34
0.00
NM
05/22/12
ND
13.69
0.00
NM
06/14/12
ND
14.94
0.00
NM
07/09/12
ND
14.08
0.00
NM
08/14/12
ND
14.29
0.00
NM
09/19/12
ND
14.08
0.00
NM
12/05/12
ND
14.53
0.00
NM
02/26/13
ND
13.80
0.00
NM
05/31/13
ND
13.61
0.00
NM
08/28/13
ND
13.74
0.00
NM
11/07/13
ND
14.42
0.00
NM
02/27/14
ND
13.33
0.00
NM
06/02/14
ND
13.34
0.00
NM
10/16/14
ND
14.18
0.00
NM
MW-8R
04/23/15
NS ND
13.57
0.00
NM
10/13/15
ND
14.08
0.00
NM
04/28/16
ND
13.53
0.00
NM
09/19/16
ND
13.91
0.00
NM
03/03/17
ND
13.92
0.00
NM
09/20/17
ND
13.61
0.00
NM
03/01/18
ND
13.63
0.00
NM
08/20/18
ND
13.52
0.00
NM
03/15/19
ND
13.35
0.00
NM
10/08/19
ND
13.54
0.00
NM
03/25/20
ND
12.59
0.00
NM
09/01/20
ND
12.72
0.00
NM
04/02/21
ND
12.16
0.00
NM
11/16/21
ND
13.25
0.00
NM
04/06/22
ND
12.87
0.00
NM
12/30/22
ND
13.15
0.00
NM
06/24/93
NM
NM
NM
NM
08/23/94
NM
NM
NM
NM
03/21/95
ND
13.55
0.00
86.89
08/05/96
ND
13.64
0.00
86.80
11/17/98
ND
14.26
0.00
86.18
06/19/01
ND
14.55
0.00
85.89
09/12/01
ND
14.81
0.00
85.63
12/27/01
ND
14.85
0.00
85.59
03/05/02
ND
14.64
0.00
85.80
MW-14
05/12/03
100.44 ND
13.41
0.00
87.03
12/09/03
ND
13.51
0.00
86.93
03/23/06
ND
13.82
0.00
86.62
05/08/07
ND
13.54
0.00
86.90
05/14/08
ND
13.64
0.00
86.80
05/28/09
ND
13.47
0.00
86.97
05/27/10
ND
13.00
0.00
87.44
10/13/11
ND
14.14
0.00
86.30
06/02/14
ND
13.42
0.00
87.02
04/28/16
ND
13.65
0.00
86.79
Page 3 of 5

Appendix A
Historical Groundwater Elevation Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
MW-15
MW-16
MW-17
64 ARCADIS built fo,iaatassetvs ,,
06/24/93
NM
NM
NM
NM
08/23/94
NM
NM
NM
NM
03/21/95
ND
12.83
0.00
87.08
08/05/96
ND
12.77
0.00
87.14
11/17/98
ND
13.58
0.00
86.33
06/19/01
ND
13.80
0.00
86.11
09/12/01
ND
14.18
0.00
85.73
12/27/01
ND
14.29
0.00
85.62
03/05/02
ND
13.98
0.00
85.93
05/12/03
NM
12.75
NM
87.16
99.91
12/09/03
ND
12.89
0.00
87.02
03/23/06
ND
13.14
0.00
86.77
05/08/07
ND
12.90
0.00
87.01
05/14/08
ND
13.12
0.00
86.79
05/28/09
ND
12.90
0.00
87.01
05/27/10
ND
12.25
0.00
87.66
10/31/11
ND
13.61
0.00
86.30
06/02/14
ND
12.82
0.00
87.09
10/16/14
ND i
13.91
0.00
86.00
04/28/16
ND
13.15
0.00
86.76
06/24/93
NM
NM
NM
NM
08/23/94
NM
NM
NM
NM
03/21/95
ND
12.06
0.00
85.36
08/05/96
ND
12.09
0.00
85.33
11/17/98
ND
12.60
0.00
84.82
06/19/01
ND
12.74
0.00
84.68
09/12/01
ND
12.98
0.00
84.44
12/27/01
NM
NM
NM
NM
03/05/02
ND
12.83
0.00
84.59
05/12/03
97.42 NM
NM
NM
NM
12/09/03
ND
12.13
0.00
85.29
03/23/06
ND
12.18
0.00
85.24
05/08/07
NM
NM
NM
NM
05/14/08
ND
12.03
0.00
85.39
05/28/09
ND
11.96
0.00
85.46
05/27/10
ND
11.69
0.00
85.73
10/31/11
ND
12.45
0.00
84.97
11/07/13
ND
12.88
0.00
84.54
06/02/14
ND
11.97
0.00
85.45
06/24/93
NM
NM
NM
NM
08/23/94
NM
NM
NM
NM
03/21/95
ND
14.42
0.00
85.58
08/05/96
ND
14.46
0.00
85.54
11/17/98
ND
14.91
0.00
85.09
06/19/01
ND
�15.03
0.00
84.97
09/12/01
ND
15.28
0.00
84.72
12/27/01
ND
15.37
0.00
84.63
03/05/02
ND
15.15
0.00
84.85
05/12/03
100.00 NM
14.15
NM
85.85
12/09/03
ND
14.50
0.00
85.50
03/23/06
ND
14.45
0.00
85.55
05/08/07
ND
14.22
0.00
85.78
05/14/08
ND
14.22
0.00
85.78
05/28/09
ND
14.12
0.00
85.88
05/27/10
ND
13.90
0.00
86.10
10/31/11
ND
14.72
0.00
85.28
06/02/14
ND
14.14
0.00
85.86
04/28/16
ND
14.36
0.00
85.64
Page 4 of 5

Appendix A
Historical Groundwater Elevation Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
MW-18
MW-19
10/31/11
05/22/12
O6/14/12
07/09/12
08/14/12
09/19/12
12/05/12
02/26/13
r15/31 /13
UO/Zo/1S
11/07/13
02/27/14
06/02/14
10/16/14
04/23/15
10/13/15
04/28/16
09/19/16
03/03/17
09/20/17
03/01/18
08/20/18
10/31/11
05/22/12
O6/14/12
07/09/12
08/14/12
09/19/12
12/05/12
02/26/13
05/31/13
08/28/13
11/07/13
02/27/14
O6/02/14
10/16/14
04/23/15
10/13/15
04/28/16
09/19/16
03/03/17
09/20/17
03/01/18
08/20/18
03/15/19
10/08/19
03/25/20
NS
NS
64 ARCADIS built Po,inatassetss v,n
NO
13.95
0.00
NM
ND
14.10
0.00
NM
NO
13.61
0.00
NM
ND
14.05
0.00
NM
NO
14.43
0.00
NM
ND
14.34
0.00
NM
NO
14.62
0.00
NM
ND
14.67
0.00
NM
NO
14.57
0.00
NM
ND
14.33
0.00
NM
NO
14.51
0.00
NM
ND
13.76
0.00
NM
NO 1
13.55
0.00
NM
ND
14.37
0.00
NM
NO
13.84
0.00
NM
ND
14.81
0.00
NM
NO
13.62
0.00
NM
ND
14.04
0.00
NM
NO
14.08
0.00
NM
ND
13.21
0.00
NM
NO
13.60
0.00
NM
NO
13.42
0.00
NM
NO
13.75
0.00
NM
ND
13.37
0.00
NM
NO
13.39
0.00
NM
ND
13.89
0.00
NM
NO
14.13
0.00
NM
ND
14.02
0.00
NM
NO
14.39
0.00
NM
ND
13.62
0.00
NM
NO
13.47
0.00
NM
ND
13.56
0.00
NM
NO
14.25
0.00
NM
ND
13.17
0.00
NM
NO
13.14
0.00
NM
ND
14.03
0.00
NM
NO
13.46
0.00
NM
ND
14.01
0.00
NM
NO
13.38
0.00
NM
ND
13.75
0.00
NM
NO
13.79
0.00
NM
ND
13.48
0.00
NM
NO
13.42
0.00
NM
NO
13.38
0.00
NM
NO
12.22
0.00
NM
NO
13.27
0.00
NM
Paved Over - Destroyed (4)
Notes:
1. Measured in feet relative to site datum
2. Corr. GW Elev. _ (ref. point elevation) - (depth to groundwater) + (LNAPL thickness)(LNAPL specific gravity)
3. LNAPL specific gravity assumed to be 0.73
4. MW-19 was paved over and presumed destroyed on 3/25/2020.
* - Prior to URS' work at this Site, monitoring well MW-3 has previously been reported as MW-2, monitoring well MW-6 has previously been
reported as MW-8, and monitoring well MW-8 has previously been reported as MW-6.
LNAPL = Light non -aqueous phase liquid
NO = Not detected
NM = Not measured
NS = Not Surveyed
TOC = Top of casing
btoc = below top of casing
- During the May 2003 sampling event LNAPL was observed in MW-5. Depth to groundwater and thickness of LNAPL were not measured
Page 5 of 5

APPENDIX B
Laboratory Analytical Report and Chain -of -Custody Record — January
12, 2023

•
% eurofins
Environment Testing
W
ANALYTICAL REPORT C
PREPARED FOR
Attn: Hardik Patel
ARCADIS U.S., Inc.
5420 Wade Park Boulevard C
Suite 350
Raleigh, North Carolina 27607
Generated 1/12/2023 2:46:21 PM
JOB DESCRIPTION
BP 24163
JOB NUMBER
400-231370-1

The test results in this report meet all NELAP requirements for accredited parameters, unless otherwise noted, and relate
only to the referenced samples. Pursuant to NELAP, this report may not be reproduced, except in full, without written
approval from the laboratory. For questions please contact the Project Manager at the e-mail address listed on this page, or
the telephone number at the bottom of the page. Eurofins Environment Testing Southeast LLC, Pensacola Certifications and
Approvals: Alabama (40150), Arizona (AZ0710), Arkansas (88-0689), Florida (E81010), Illinois (200041), Iowa (367), Kansas
(E-10253), Kentucky UST (53), Louisiana (30748), Maryland (233), Massachusetts (M-FL094), Michigan (9912), New
Hampshire (250510), New Jersey (FL006), North Carolina (314), Oklahoma (9810), Pennsylvania (68-00467), Rhode Island
(LAO00307), South Carolina (96026), Tennessee (TN02907), Texas (T104704286-10-2), Virginia (00008), Washington
(C2043), West Virginia (136), USDA Foreign Soil Permit (P330-08-00006).
The test results in this report relate only to the samples as received by the laboratory and will meet all requirements of the
methodology, with any exceptions noted. This report shall not be reproduced except in full, without the express written
approval of the laboratory. All questions should be directed to the Eurofins Environment Testing Southeast, LLC Project
Manager.
Generated
1/12/2023 2:46:21 PM
Authorized for release by
Leah Klingensmith, Senior Project Manager
Leah. Klingensmith(a)et.eurofinsus.com
[phone]
Eurofins Pensacola is a laboratory within Eurofins Environment Testing Southeast, LLC, a company within Eurofins Environment Testing Group of Companies
Page 2 of 16 1 /12/2023

Client: ARCADIS U.S., Inc.
Project/Site: BP 24163
Table of Contents
Laboratory Job ID: 400-231370-1 C
Cover Page ..............................................
1
Table of Contents .........................................
3
Sample Summary .........................................
4
Case Narrative ...........................................
5
Definitions ...............................................
6
Client Sample Results ......................................
7
QC Sample Results ........................................
9
QC Association ...........................................
10
Chronicle................................................
11
Method Summary .........................................
13
Certification Summary ......................................
14
Chain of Custody ..........................................
15
Receipt Checklists .........................................
16
Eurofins Pensacola
Page 3 of 16 1/12/2023

Sample Summary
Client: ARCADIS U.S., Inc.
Project/Site: BP 24163
Lab Sample ID Client Sample ID
400-231370-1 MW-8R
Matrix Collected Received
Water 12/30/22 10:45 01/06/23 08:58
400-231370-2 MW-6 Water 12/30/22 12:15 01/06/23 08:58
Job ID: 400-231370-1
Page 4 of 16
Eurofins Pensacola
1 /12/2023

Case Narrative
Client: ARCADIS U.S., Inc.
Project/Site: BP 24163
Job ID: 400-231370-1
Laboratory: Eurofins Pensacola
Narrative
Job Narrative
400-231370-1
Job ID: 400-231370-1
Receipt
The samples were received on 1/6/2023 8:58 AM. Unless otherwise noted below, the samples arrived in good condition, and, where
required, properly preserved and on ice. The temperature of the cooler at receipt time was 0.0°C
HPLC/IC
Method 9056_ORGFM_28D: Due to the high concentration of Sulfate, the matrix spike / matrix spike duplicate (MS/MSD) for analytical
batch 400-607894 could not be evaluated for accuracy and precision. The associated laboratory control sample (LCS) met acceptance
criteria.
Method 9056_ORGFM_28D: The following sample was diluted to bring the concentration of target analytes within the calibration range:
MW-8R (400-231370-1). Elevated reporting limits (RLs) are provided.
No additional analytical or quality issues were noted, other than those described above or in the Definitions/ Glossary page.
Eurofins Pensacola
Page 5 of 16 1 /12/2023

Definitions/Glossary
Client: ARCADIS U.S., Inc. Job ID: 400-231370-1
Project/Site: BP 24163
Qualifiers
HIRMIC
Qualifier
4
E
Qualifier Description
MS, MSD: The analyte present in the original sample is greater than 4 times the matrix spike concentration; therefore, control limits are not
applicable.
Result exceeded calibration range.
Glossary
Abbreviation These commonly used abbreviations may or may not be present in this report.
tt Listed under the "D" column to designate that the result is reported on a dry weight basis
%R Percent Recovery
CFL Contains Free Liquid
CFU Colony Forming Unit
CNF Contains No Free Liquid
DER Duplicate Error Ratio (normalized absolute difference)
Dil Fac Dilution Factor
DL Detection Limit (DoD/DOE)
DL, RA, RE, IN Indicates a Dilution, Re -analysis, Re -extraction, or additional Initial metals/anion analysis of the sample
DLC Decision Level Concentration (Radiochemistry)
EDL Estimated Detection Limit (Dioxin)
LOD Limit of Detection (DoD/DOE)
LOQ Limit of Quantitation (DoD/DOE)
MCL EPA recommended "Maximum Contaminant Level'
MDA Minimum Detectable Activity (Radiochemistry)
MDC Minimum Detectable Concentration (Radiochemistry)
MDL Method Detection Limit
ML Minimum Level (Dioxin)
MPN Most Probable Number
MQL Method Quantitation Limit
NC Not Calculated
ND Not Detected at the reporting limit (or MDL or EDL if shown)
NEG Negative / Absent
POS Positive / Present
PQL Practical Quantitation Limit
PRIES Presumptive
QC Quality Control
RER Relative Error Ratio (Radiochemistry)
RL Reporting Limit or Requested Limit (Radiochemistry)
RPD Relative Percent Difference, a measure of the relative difference between two points
TEF Toxicity Equivalent Factor (Dioxin)
TEQ Toxicity Equivalent Quotient (Dioxin)
TNTC Too Numerous To Count
Eurofins Pensacola
Page 6 of 16 1 /12/2023

Client Sample Results
Client: ARCADIS U.S., Inc.
Project/Site: BP 24163
Client Sample ID: MW-8R
Date Collected: 12/30/22 10:45
Date Received: 01/06/23 08:58
Method: SW846 9056 - Anions, Ion Chromatography
Analyte Result Qualifier
Sulfate 381
F
Job ID: 400-231370-1
Lab Sample ID: 400-231370-1
Matrix: Water
RL MDL Unit D Prepared Analyzed Dil Fac
10.0 mg/L 01/11/2316:27 10
Eurofins Pensacola
Page 7 of 16 1/12/2023

Client Sample Results
Client: ARCADIS U.S., Inc.
Project/Site: BP 24163
Client Sample ID: MW-6
Date Collected: 12/30/22 12:15
Date Received: 01/06/23 08:58
Method: SW846 9056 - Anions, Ion Chromatography
Analyte Result Qualifier
Sulfate 33.8
F
Job ID: 400-231370-1
Lab Sample ID: 400-231370-2
Matrix: Water
RL MDL Unit D Prepared Analyzed Dil Fac
1.00 mg/L 01/10/23 22:34 1
Eurofins Pensacola
Page 8 of 16 1/12/2023

QC Sample Results
Client: ARCADIS U.S., Inc.
Project/Site: BP 24163
Method: 9056 - Anions, Ion Chromatography
Lab Sample ID: MB 400-607894/37
Matrix: Water
Analysis Batch: 607894
MB MB
Analyte Result Qualifier
Sulfate
ND
Lab Sample ID: MB 400-607894/5
Matrix: Water
Analysis Batch: 607894
MB MB
Analyte Result Qualifier
Sulfate
ND
Lab Sample ID: LCS 400-607894/38
Matrix: Water
Analysis Batch: 607894
Spike
Analyte
Added
Sulfate
10.0
Lab Sample ID: LCS 400-607894/6
Matrix: Water
Analysis Batch: 607894
Spike
Analyte
Added
Sulfate
10.0
Lab Sample ID: LCSD 400-607894/39
Matrix: Water
Analysis Batch: 607894
Spike
Analyte
Added
Sulfate
10.0
Lab Sample ID: LCSD 400-607894/7
Matrix: Water
Analysis Batch: 607894
Spike
Analyte
Added
Sulfate
10.0
Lab Sample ID: 280-170841-D-9 MS
Matrix: Water
Analysis Batch: 607894
Sample
Sample
Spike
Analyte Result
Qualifier
Added
Sulfate 108
E
10.0
Lab Sample ID: 280-170841-D-9 MSD
Matrix: Water
Analysis Batch: 607894
Sample
Sample
Spike
Analyte Result
Qualifier
Added
Sulfate 108
E
10.0
Page 9 of 16
F
Job ID: 400-231370-1
Client Sample ID: Method Blank
Prep Type: Total/NA
L
MDL Unit D Prepared Analyzed Dil Fac
mg/L 01/11/23 04:19 1
Client Sample ID: Method Blank
Prep Type: Total/NA
F
MDL Unit D Prepared Analyzed Dil Fac
mg/L 01 /10/23 16:04 1
Client Sample ID: Lab Control Sample
Prep Type: Total/NA
LCS LCS %Rec
Result Qualifier Unit D %Rec Limits
9.862 mg/L 99 90 -110
Client Sample ID: Lab Control Sample
Prep Type: Total/NA
LCS LCS %Rec
Result Qualifier Unit D %Rec Limits
9.941 mg/L 99 90 -110
Client Sample ID: Lab Control Sample Dup
Prep Type: Total/NA
LCSD LCSD %Rec RPD
Result Qualifier Unit D %Rec Limits RPD Limit
9.926 mg/L 99 90 -110 1 15
Client Sample ID: Lab Control Sample Dup
Prep Type: Total/NA
LCSD LCSD %Rec RPD
Result Qualifier Unit D %Rec Limits RPD Limit
9.970 mg/L 100 90 -110 0 15
Client Sample ID: Matrix Spike
Prep Type: Total/NA
MS MS %Rec
Result Qualifier Unit D %Rec Limits
112.6 E 4 mg/L 46 80 -120
Client Sample ID: Matrix Spike Duplicate
Prep Type: Total/NA
MSD MSD %Rec RPD
Result Qualifier Unit D %Rec Limits RPD Limit
112.7 E 4 mg/L 47 80 -120 0 20
Eurofins Pensacola
1 /12/2023

QC Association Summary
Client: ARCADIS U.S., Inc.
Project/Site: BP 24163
HPLCAC
Analysis Batch: 607894
Lab Sample ID
Client Sample ID
400-231370-1
MW-8R
400-231370-2
MW-6
MB 400-607894/37
Method Blank
MB 400-607894/5
Method Blank
LCS 400-607894/38
Lab Control Sample
LCS 400-607894/6
Lab Control Sample
LCSD 400-607894/39
Lab Control Sample Dup
LCSD 400-607894/7
Lab Control Sample Dup
280-170841-D-9 MS
Matrix Spike
280-170841-D-9 MSD
Matrix Spike Duplicate
Job ID: 400-231370-1
Prep Type
Matrix
Method Prep Batch
Total/NA
Water
9056
Total/NA
Water
9056
Total/NA
Water
9056
Total/NA
Water
9056
Total/NA
Water
9056
Total/NA
Water
9056
Total/NA
Water
9056
Total/NA
Water
9056
Total/NA
Water
9056
Total/NA
Water
9056
0
Eurofins Pensacola
Page 10 of 16 1/12/2023

Lab Chronicle
Client: ARCADIS U.S., Inc.
Job ID: 400-231370-1
Project/Site: BP 24163
Client Sample ID: MW-811
Lab Sample ID: 400-231370-1
Date Collected: 12/30/22 10:45
Matrix: Water
Date Received: 01/06/23 08:58
Batch Batch
Dil
Initial
Final
Batch Prepared
Prep Type Type Method
Run
Factor
Amount
Amount
Number or Analyzed Analyst Lab
Total/NA Analysis 9056
10
10 mL
10 mL
607894 01/11/23 16:27 JAW EET PEN
Client Sample ID: MW-6
Lab Sample ID: 400-231370-2
Date Collected: 12/30/22 12:15
Matrix: Water
Date Received: 01/06/23 08:58
Batch Batch
Dil
Initial
Final
Batch Prepared
Prep Type Type Method
Run
Factor
Amount
Amount
Number or Analyzed Analyst Lab
Total/NA Analysis 9056
1
10 mL
10 mL
607894 01/10/23 22:34 JAW EET PEN
Client Sample ID: Method Blank
Lab Sample ID: MB 400-607894/37
Date Collected: N/A
Matrix: Water
Date Received: N/A
Batch Batch
Dil
Initial
Final
Batch Prepared
Prep Type Type Method
Run
Factor
Amount
Amount
Number or Analyzed Analyst Lab
Total/NA Analysis 9056
1
10 mL
10 mL
607894 01/11/23 04:19 JAW EET PEN
Client Sample ID: Method Blank
Lab Sample ID: MB 400-607894/5
Date Collected: N/A
Matrix: Water
Date Received: N/A
Batch Batch
Dil
Initial
Final
Batch Prepared
Prep Type Type Method
Run
Factor
Amount
Amount
Number or Analyzed Analyst Lab
Total/NA Analysis 9056
1
10 mL
10 mL
607894 01/10/23 16:04 JAW EET PEN
Client Sample ID: Lab Control Sample Lab Sample ID: LCS 400-607894/38
Date Collected: N/A Matrix: Water
Date Received: N/A
F Batch Batch Dil Initial Final Batch Prepared
Prep Type Type Method Run Factor Amount Amount Number or Analyzed Analyst Lab
Total/NA Analysis 9056 1 10 mL 10 mL 607894 01/11/23 04:42 JAW EET PEN
Client Sample ID: Lab Control Sample
Lab Sample ID: LCS 400-607894/6
Date Collected: N/A
Matrix: Water
Date Received: N/A
IBatch Batch Dil
Initial
Final
Batch Prepared
Prep Type Type Method Run Factor
Amount
Amount
Number or Analyzed Analyst Lab
Total/NA Analysis 9056 1
10 mL
10 mL
607894 01/10/23 16:27 JAW EET PEN
Client Sample ID: Lab Control Sample Dup
Lab Sample ID: LCSD 400-607894/39
Date Collected: N/A
Matrix: Water
Date Received: N/A
Batch Batch Dil
Initial
Final
Batch Prepared
Prep Type Type Method Run Factor
Amount
Amount
Number or Analyzed Analyst Lab
Total/NA Analysis 9056 1
10 mL
10 mL
607894 01/11/23 05:05 JAW EET PEN
Page 11 of 16
Eurofins Pensacola
1 /12/2023

Lab Chronicle
Client: ARCADIS U.S., Inc.
Project/Site: BP 24163
Client Sample ID: Lab Control Sample Dup
Date Collected: N/A
Date Received: N/A
F
Job ID: 400-231370-1
Lab Sample ID: LCSD 400-607894/7
Matrix: Water
F
Batch Batch
Dil
Initial
Final
Batch Prepared
Prep Type Type Method Run
Factor
Amount
Amount
Number or Analyzed Analyst Lab
Total/NA Analysis 9056
1
10 mL
10 mL
607894 01/10/23 16:50 JAW EET PEN
Client Sample ID: Matrix Spike
Lab Sample ID: 280-170841-D-9 MS
Date Collected: N/A
Matrix: Water
Date Received: N/A
Batch Batch
Dil
Initial
Final
Batch Prepared
Prep Type Type Method Run
Factor
Amount
Amount
Number or Analyzed Analyst Lab
Total/NA Analysis 9056
1
10 mL
10 mL
607894 01/11/23 05:51 JAW EET PEN
Client Sample ID: Matrix Spike Duplicate
Lab Sample ID: 280-170841-D-9 MSD
Date Collected: N/A
Matrix: Water
Date Received: N/A
Batch Batch Dil Initial Final Batch Prepared
Prep Type Type Method Run Factor Amount Amount Number or Analyzed Analyst Lab
Total/NA Analysis 9056 1 10 mL 10 mL 607894 01/11/23 06:14 JAW EET PEN
Laboratory References:
EET PEN = Eurofins Pensacola, 3355 McLemore Drive, Pensacola, FL 32514, TEL [phone]
Page 12 of 16
Eurofins Pensacola
1 /12/2023

Method Summary
Client: ARCADIS U.S., Inc.
Project/Site: BP 24163
Job ID: 400-231370-1
Method Method Description Protocol Laboratory
9056 Anions, Ion Chromatography SW846 EET PEN
Protocol References:
SW846 = "Test Methods For Evaluating Solid Waste, Physical/Chemical Methods", Third Edition, November 1986 And Its Updates.
Laboratory References:
EET PEN = Eurofins Pensacola, 3355 McLemore Drive, Pensacola, FL 32514, TEL [phone]
Eurofins Pensacola
Page 13 of 16 1/12/2023

Accreditation/Certification Summary
Client: ARCADIS U.S., Inc.
Project/Site: BP 24163
Laboratory: Eurofins Pensacola
Unless otherwise noted, all analytes for this laboratory were covered under each accreditation/certification below.
Job ID: 400-231370-1
Authority Program Identification Number Expiration Date
North Carolina (WW/SW) State 314 12-31-23
The following analytes are included in this report, but the laboratory is not certified by the governing authority. This list may include analytes for which
the agency does not offer certification.
Analysis Method Prep Method Matrix Analyte
9056 Water Sulfate
Eurofins Pensacola
Page 14 of 16 1/12/2023

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Page 15 of 16
1 /12/2023

Client: ARCADIS U.S., Inc.
Login Number: 231370
List Number: 1
Creator: Whitley, Adrian
Question
Login Sample Receipt Checklist
Answer Comment
Radioactivity wasn't checked or is </= background as measured by a survey
N/A
meter.
The cooler's custody seal, if present, is intact.
N/A
Sample custody seals, if present, are intact.
N/A
The cooler or samples do not appear to have been compromised or
True
tampered with.
Samples were received on ice.
True
Cooler Temperature is acceptable.
True
Cooler Temperature is recorded.
True
COC is present.
True
COC is filled out in ink and legible.
True
COC is filled out with all pertinent information.
True
Is the Field Sampler's name present on COC?
True
There are no discrepancies between the containers received and the COC.
True
Samples are received within Holding Time (excluding tests with immediate
True
HTs)
Sample containers have legible labels.
True
Containers are not broken or leaking.
True
Sample collection date/times are provided.
True
Appropriate sample containers are used.
True
Sample bottles are completely filled.
True
Sample Preservation Verified.
N/A
There is sufficient vol. for all requested analyses, incl. any requested
True
MS/MSDs
Containers requiring zero headspace have no headspace or bubble is
N/A
<6mm (1/4").
Multiphasic samples are not present.
True
Samples do not require splitting or compositing.
True
Residual Chlorine Checked.
N/A
0.0°C IR9
Job Number: 400-231370-1
List Source: Eurofins Pensacola
Eurofins Pensacola
Page 16 of 16 1/12/2023

APPENDIX C
Historical Groundwater Analytical Data

Appendix C
Historical Groundwater Analytical Summary
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
Design
D
ARCJaDIS &Consultancy
Design raland
builtassets
NC GCL:
5,000
84,500
260,000
85,500
20,000
NE
NE
NC 2L
1
600
600
500
20
250
NE
_
Units:
W1
Ng/I
N9/1
Ng/I
Ng/I
mg/I
mg/I
5/13/2003
8.5
0.98 J
0.61 J
1.7 J
8
-
12/9/2003
47.4
14.3
1.9
8.1
37.3
-
3/23/2006
4.5 J
< 0.5
< 0.5 UJ
< 1 UJ
5.5
--
-
5/8/2007
40.4
3.7
1.4
2 J
13.1
--
-
5/14/2008
4.3 J
< 0.8
< 0.7
< 0.8
14
-
5/28/2009
5.4
0.44 J
0.14 J
0.49 J
5.6
--
--
5/27/2010
0.44 J
< 0.11
0.3 J
< 0.32
4.8
10/31/2011
5.5
0.76
< 0.17 U
0.38 J
19.1
8.4
405
5/22/2012
< 0.43 U
< 0.2
< 0.2
< 0.52
4.6
15.3
378
6/14/2012
12.1
6.7
0.72
4.7
15.4
6.6 J
344
7/9/2012
2.2
1.6
2.6
3
14.7
9.9
393
MW-3
8/14/2012
2
2.1
<0.13
0.4J
17.9
3.6
303
9/19/2012
2.7
0.66
< 0.13
0.33 J
19.8
2.8
459
12/5/2012
11.3
1.2
0.43 J
1.11
19.3
0.78 J
377
2/26/2013
0.23 J
< 0.1
< 0.1
< 0.22
5.4
32.6
338
5/31 /2013
0.32 J
< 0.1
< 0.1
< 0.22
10.5
17.9
334
8/28/2013
3.6
0.53
0.12 J
0.31 J
10.3
21.9
457
11 /7/2013
4.3
0.27 J
0.13 J
< 0.22
10
21.7
536
2/27/2014
< 0.1
< 0.1
< 0.1
< 0.2
1.3
42.2
198
6/3/2014
0.48 J
0.15 J
< 0.1
< 0.2
3.1
10/16/2014
--
--
18.0
372
4/23/2015
22.8
296
9/19/2016
21.3
3/23/2006
11,700
2,440
32,000
13,500
16,100
-
3/23/2006It1
' 11,000
2,370
30,700
13,200
15,400
-
5/8/2007
' 7,410
1,590
21,100
8,830
--
-
5/8/2007 "1
' 7,400
1,680
20,100
_8,920
9,290
9,360
-
MW-5
5/14/2008
10,000
2,100
29,000
12,000
18,000
-
5/14/2008I11
10,000
2,100
30,000
12,000
18,000
-
5/28/2009
7,390
2,330
25,700
13,400
6,920
--
-
5/28/2009 i11
6,510
2,240
22,100
12,900
6,510
-
5/27/2010
6,610
2,810
24,300 J
15,700
4,330
-
5/27/2010I11
6,090
2,380
30,100J
13,300
4,250
-
10/31/2011
7,960
2,660
28,000
13,800
3,830
<1
<5
10/31/2011I11
8,360
2,870
24,600
14,800
4,070
5/22/2012
7,980
3,470
32,200
19,200
3,820
< 5
179
6/15/2012 (2)
244
227
1,190
1,120
36.9
6,070
1,820
7/9/2012
336 J
481 J
2,010 J
2,400 J
48.4 J
6,470
2,620
MW-5R
8/14/2012
201
283
1,050
1,300
48.5
14,700
4,190
9/19/2012
158
181
650
883
114
19,000
3,280
12/5/2012
754
505
2,220
2,380
1,160
13,600
1,840
2/26/2013
1,360
878
3,520
3,940
1,660
8,520
1,530
5/31/2013
1,410
1,380
5,930
6,220
1,150 J
4,680
1,560
8/28/2013
165
178
489
1,380
417
13,900
1,590
11/7/2013
214
131
331
969
651
14,400
1,570
2/27/2014
142
177
328
1,060
240
2,990
807
6/2/2014
256
436
1040
2520
519 J
10/16/2014
-
-
--
--
--
9,950
1,390
4/23/2015
-
-
--
--
--
5,980
1,510
10/13/2015
-
-
--
--
--
5,790
--
4/28/2016
-
-
--
--
--
2,980
--
MW-5R
9/19/2016
-
2,880
3/3/2017
-
3,570
-
9/20/2017
--
-
--
--
--
1,060
- -/20/2
8018
-
147
-
Page 1 of 4

Appendix C
Historical Groundwater Analytical Summary
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
MW-6
MW-61
MW-8
MW-8R
NC GCL:
NC 2L
Units:
5/12/2003
12/9/2003
12/9/2003
3/23/2006
5/8/2007
5/14/2008
5/28/2009
5/27/2010
10/31/2011
6/2/2014
3/25/2020
9/1/2020
4/2/2021
11/16/2021
4/6/2022
12/30/2022
5/12/2003
12/9/2003
3/23/2006
5/8/2007
5/14/2008
5/28/2009
5/27/2010
10/31/2011
6/2/2014
3/23/2006
5/8/2007
5/14/2008
5/28/2009
5/27/2010
10/31/2011
5/22/2012
6/15/2012 (2)
7/9/2012
8/14/2012
9/19/2012
12/5/2012
2/26/2013
5/31/2013
8/28/2013
11/7/2013
2/27/2014
6/2/2014
6/2/2014 i11
10/16/2014
4/23/2015
10/13/2015
4/29/2016
9/19/2016
3/3/2017
9/20/2017
3/1/2018
8/20/2018
3/15/2019
10/8/2019
3/25/2020
9/1/2020
4/2/2021
11/16/2021
4/6/2022
12/30/2022
5,000
1
Ng/I
< 0.5
2.3
2.4
0.76 J
< 0.5
< 0.5
< 0.06
< 0.11
8.7 J
17.6 J
< 0.5
< 2.5
49.7
< 25
5.2 J
2.5
1.6 J
0.41 J
< 0.1
671
1,160
600
1,390
8,570
8,000
8,270
726
4,540 J
4,370
4,780
7,760
7,310
6,540
1,600
1,130
1,020
1,360 J
1,540
3,310
84,500 260,000
600 600
Ng/I Ng/I
0.52 JJ 10.5
0.64 J 1.1
0.68 J 1.1
0.59 J 3.6
< 0.5 < 0.5
< 0.8 < 0.7
< 0.05 < 0.06
0.13 J 0.38 J
11.7 J 27.5 J
59.4 J 31.6 J
< 0.5 < 0.5
< 2.5 < 2.5
18.9 48.7
< 25 < 25
<2 <1.8
< 0.05
< 1.1
< 0.36 < 0.32
< 0.1 < 0.1 _
1,340 1,230
799 196
1,800 700
2,050 357
2,870 31,700
3,180 32,100
3,360 36,400 J
47 J 760
1,870 J 17,100 J
1,610 19,300
1,800 20,900
2,440 31,900
2,480 30,500
3,040 30,500
628 5,390
329 2,440
603 3,200
680 J 3,510 J
556 J 3,650
883 9,070
85,500
20,000
500
20
Ng/I
Ng/I
<1
3
3.6
17.6
3.8
18
2.8 J
1.1
< 1
< 0.5
< 0.8
< 0.5
<0.14
0.17J
0.46J
<0.12
132 J
< 0.26 UJ
99.4 J
783 J
1.111
< 0.5
<< 5
< 2.5
443
3,560
< 50
6,910
< 2
3,400
<0.14
1,150
< 3.2
492
<0.75
122
< 0.2
3.3
8,100
124
2,990
1,440
3,000
190
3,310
1,560
15,700
6,260
17,200
3,170
17,800
3,920
242 J
96.3 J
10,800 J
1,530 J
8,780
2,000
10,400
2,600
13,800
4,560
13,400
4,530
12,500
4,200
3,990
1,380
1,830
1,770
3,430
1,190
3,330 J
2,110 J
2,630 J
2,640 J
4,990
3,910
Design
D
ARCJaDIS &Consultancy
Design raland
builtassets
NE
250
131
25.2
38.6
24.0
33.5
31.1
33.8
<1
<1
<5
4,760
6,570
7,010
6,700
2,410
959
439
4,770
7,460
7,670
3,560
2,050
1,600
1,640
1,330
1,720
797
677
436
60
475
450
442
306
711
696
381
NE
NE
2,130
76.1
<5
119
22,200
4,500
1,560
1,100
635
590
437
703
766
940
842
812
Page 2 of 4

Appendix C
Historical Groundwater Analytical Summary
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
Design
D
ARCJaDIS &Consultancy
Design raland
builtassets
NC GCL:
5,000
84,500
260,000
85,500
20,000
NE
NE
NC 2L
1 1
600
600
500
20
250
NE
_
Units:
Ng/I
Ng/I
Ng/I
Ng/I
Ng/I
mg/I
mg/I
5/12/2003
< 0.5
< 0.5
< 0.5
< 1
0.52 J
-
12/9/2003
< 0.5
< 0.5
< 0.5
< 1
5.9
-
3/23/2006
< 0.5
< 0.5
< 0.5
< 1
< 0.5
--
-
5/8/2007
< 0.5
< 0.5
< 0.5
< 1
< 0.5
--
-
MW-14
5/14/2008
<0.5
<0.8
<0.7
<0.8
<0.5
--
-
5/28/2009
< 0.06
< 0.05
0.077 J
< 0.14
< 0.06
--
-
5/27/2010
< 0.11
< 0.11
< 0.11
< 0.32
< 0.12
-
10/31 /2011
< 0.13
< 0.15
< 0.42 U
< 0.3
< 0.13
43.2
< 5
6/3/2014
< 0.1
< 0.1
< 0.1
< 0.2
< 0.1
-
3/23/2006
0.63 J
2.1
< 0.5
18.6
1.6
-
5/8/2007
< 0.5
< 0.5
< 0.5
2.2 J
< 0.5
-
5/14/2008
< 0.5
< 0.8
< 0.7
3.7 J
< 0.5
--
-
MW-15
5/27/2010
<0.11
<0.11
<0.11
<0.32
<0.12
-
10/31/2011
<0.13
<0.15
<0.13
<0.3
<0.13
<1
<5
6/3/2014
< 0.1
< 0.1
< 0.1
< 0.2
< 0.1
-
10/16/2014
<0.1
<0.1
<0.1
<0.2
<0.1
-
3/23/2006
< 2.5
90.8
15.8
836
2.8 J
-
5/14/2008
<0.5
160
15
1,600
4.1 J
--
-
5/27/2010
3.6
54.7 J
5.1
525 J
1.3
--
-
MW-16
10/31 /2011
< 0.65
17.2
< 1.4 U
321
< 0.65
194
<5
11/7/2013
--
--
--
--
--
55.4
<5
6/3/2014
< 0.1
25
0.92
417 J
< 0.1
-
5/13/2003
57.7
< 0.5
< 0.5
< 1
69
-
5/13/2003
40.8
< 0.5
< 0.5
< 1
63.3
-
12/9/2003
6.6
0.65 J
< 0.5
< 1
80.6
--
-
3/23/2006
1
< 0.5
< 0.5
< 1
58.9
--
-
5/8/2007
< 0.5
< 0.5
< 0.5
< 1
17.4
--
-
M W 17
5/14/2008
3.7 J
< 0.8
< 0.7
< 0.8
19
--
-
5/28/2009
7
< 0.05
0.076 J
< 0.14
14.5
--
-
5/27/2010
5.7
< 0.11
< 0.11
< 0.32
12.4
--
-
10/31 /2011
0.51
0.16 J
< 0.81 U
0.57 J
8.9
< 1
422
6/3/2014
< 0.1
< 0.1
< 0.1
< 0.2_
4.1
10/31/2011
3,140
998
11,100
8,950
1,140
8.2
446
5/22/2012
2,280
2,790
18,200
12,000
789
<5
307
6/15/2012 (2)
373
910
4,800
3,910
114
10,600
3,410
7/9/2012
1,730 J
2,170 J
15,000 J
9,750 J
676 J
2,300
835
8/14/2012
3,020
2,990
24,400
12,800
1,090
758
580
9/19/2012
3,190
3,090
22,600
14,000
1,240
322
542
12/5/2012
3,370
2,970
20,100
12,800
1,380
32
436
2/26/2013
2,510
2,970
10,100
8,690
1,140
13.8
500
5/31/2013
2,780
3,070
8,210
5,740
1,000
83.3
475
8/28/2013
182
368
730
1,660
139
7,850
2,230
MW_18
11/7/2013
1,140
727
4,910
3,250
694
2,640
1,370
2/27/2014
16.6
109
20.2
45.8
18.5
4,310
1,270
6/2/2014
26.2 J
125 J
37.5 J
31.6 J
37.4 J
10/16/2014
359
388
244
138
364
1,540
513
4/23/2015
780
1,100
10/13/2015
516
4/29/2016
79.4
9/19/2016
377
3/3/2017
295
-
018
3
-
8/ 20/2
018
_
173
17
Page 3 of 4

Appendix C
Historical Groundwater Analytical Summary
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
Design
D
ARCJaDIS &Consultancy
Design raland
builtassets
NC GCL:
NC 2L
Units:
5,000
1
pg/I
84,500
600
pg/I
260,000
600
pg/I
85,500
500
pg/I
20,000
20
pg/I
NE
250
mg/I
NE
NE
mg/I
10/31/2011
5/22/2012
6/15/2012 (2)
7/9/2012 _FV_5_,1_3_0-W
8/14/2012
9/19/2012
12/5/2012
2/26/2013
5/31/2013
8/28/2013
11/7/2013
2/27/2014
MW-19 6/2/2014
10/16/2014
4/23/2015
10/13/2015
4/28/2016
9/19/2016
3/3/2017
9/20/2017
3/1/2018
8/20/2018
3/15/2019
10/8/2019
3/25/2020
2,390
1,380
1 8,790
7,040
5,160
3.7
425
2,700
1,560 14,200 7,940 4,880 <5
1,440 18,200 7,940 3,290 1,090
2,910 30,400 J 16,300 5,330 232
1,650 14,200 8,370 4,090 469
1,630 12,900 8,640 3,960 260
1,810 15,200 10,400 4,010 58.8
1,110 10,600 6,990 3,890 169
894 8,820 5,250 3,120 1,530
1,190 J i 13,100 7,420 J 3,240 J 2,660
984 9,850 5,620 2,260 2,890
1,400 10,900 7,880 3,320 2,790
1,260 11,900 7,260 2,830
2,340
2,540
1,960
1,780
1,270
941
1,020
745
806
1,150
783
Paved Over - Destroyed
310
6,520
991
1,080
690
588
503
606
525
255
322
632
514
-
-
-
_
_
_
_
4,020
2,420
2,090
2,320
2,210
1,830
2,710 J
2,020
2,550
2,370
-
-
-
Notes:
(t) Field duplicate
(2)Alkalinity, sulfate, and carbon dioxide samples were collected 6/14/2012 and volatile organic analysis samples were collected 6/15/12.
"- Not sampled or analyzed
< - Not detected at the specified detection limit
pg/I - Micrograms per Liter
GCL - Gross Contamination Level
2L - North Carolina Groundwater Quality (2L) Standard
J - Estimated value
mg/I - Milligrams per Liter
MTBE - Methyl tert-Butyl Ether
NE - Not established
U - Not present above the associated level; blank contamination exists
UJ - Not detected and the detection limit is estimated
BOLD text indicates 2L exceedance
J Bold cell with green highlight indicates GCL exceedence
Activated sodium persulfate injections were performed at the site from June 4, 2012, to June 9, 2012, and from June 3, 2013, to June 6, 2013.
Page 4 of 4

fo
RCADIS
Design &Consultancy
04AnUift....t.
and
Arcadis U.S., Inc.
111-D Sanders Lane
Bluefield, Virginia 24605
Tel [phone]
Fax [phone]
www.arcadis.com