WI0400198_Monitoring (Report)_20190507

ARCADIS Design sr Consultancy
fornaturaland
built assets
Mr. Michael Rogers
UIC Program Manager
NCDEQ — DWR
1636 Mail Service Center
Raleigh, North Carolina 27699
Subject:
1st Semi -Annual Groundwater Monitoring Report — 2019
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:
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
attached 1 st Semi -Annual Groundwater Monitoring Report — 2019 for the above
referenced site. An electronic copy of this report including the associated
laboratory analytical report is included with the attached CD.
Please contact me at [phone] with any questions or concerns related to
the Report or this incident number.
Sincerely,
Arcadis G&M of North Carolina, Inc.
r
Paul Goodell, E.I.
AFS Project Manager 5
Copies:
File — BP #24163
Arcadis U.S., Inc.
111-D Sanders Lane
Bluefield, VA 24605
Tel [phone]
Fax [phone]
www.arcadis.com
A019Ide7►1tIIA0II
Date:
May 7, 2019
Contact:
Paul Goodell
Phone:
919.415.2327
Email:
[e-mail]
Our ref:
GP16BPNA.NC10
Page:
1/1

ARCADIS ')',sign&Consultancy
far naturaand
Built assetls
Atlantic Richfield Company
c/o BP Products North America, Inc.
SEMI-ANNUAL MONITORING
REPORT - 2019
Former BP Facility #24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
NCDEQ Incident #6400 (Closed)
Injection Permit #W10400198
May 2019

1 1 Semi -Annual Monitoring Report - 2019
�'4dv &I,
Hardik Patel
AFS Task Manager
�.�,•f�tvbt's.�'�f
Paul Goodell, E.I.
Certified Project Manager
E,
1 ST SEMI-ANNUAL
MONITORING REPORT
-2019
Prepared for:
Atlantic Richfield Company
c/o BP Products North America, Inc.
Mr, Greg Frisch — Project Manager
4850 E. 49", Street
MEC-3 Room 155C
Cuyahoga Heights, Ohio 44125
Tel 216,416.1232
Prepared by:
Arcadis G&M of North Carolina, Inc.
5420 Wade Park Blvd.
Suite 350
Raleigh, North Carolina 27607
Tel [phone]
Fax 919.854,5448
www.areadi.s-u5.com
Environmental
Our fie(.:
GPI6BPNA.NC10
Date:
May 6, 2019
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,
ES-1

1"1 Semi -Annual Monitoring Report - 2019
1' Semi -Annual Monitoring Report - 2019
Former BP Facility #24163
381 Knollwood St
Winston-Salem, Forsyth County, North Carolina
Latitude 3611 5' 25.94"N Longitude 8011 17' 11.79"W
(Reference Figure 1 )
Groundwater Incident #:
Risk Classification:
Reason for Risk Classification:
Land Use Category:
Source of Release:
Date of Release Discovery:
Estimated Quantity of Release:
Cause of Release:
Responsible Party:
Property Owner
6400 (Closed)
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
clo BP Products North America,
Inc.
Attn: Greg Frisch
4850 East 4Vh Street
MBC-3 Room 155C
Cuyahoga Heights, Ohio 44125
[phone]
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
Ih the information contained in this report is correct and accurate to the test of
G&M of North Carolina, Inc. is licensed to practice geology and engineering in
iljfatlon numbers of the company are C-155 (geology) and C-1869 (engineering).
ES-2

1st Semi -Annual Monitoring Report - 2019
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 - March 15, 2019
Figure 4. Groundwater Analytical Data - September 2017 - March 2019
Figure 5. Sulfate Isoconcentration Map - March 15, 2019
APPENDICES
A- Historical Groundwater Elevation Data
B- Laboratory Analytical Report and Chain -of -Custody Record — March 28, 2019
C- Historical Groundwater Analytical Data
5
7
7
7
7
8
8
9
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1s' Semi -Annual Monitoring Report - 2019
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 March 15, 2019.
All groundwater monitoring activities were conducted in response to the final project evaluation
requirement specified in Part VI I, 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 March 15, 2019, Arcadis completed a semi-annual groundwater monitoring and sampling event at the
Site. Two (2) groundwater monitoring wells (MW-8R and MW-19) were gauged to determine the depth to
water (DTW). DTW ranged from 12.22 feet below top of casing (btoc) in groundwater monitoring well MW-
19 to 13.35 feet btoc in groundwater monitoring well MW-8R. The historical groundwater flow direction for
the Site is towards the southeast.
On March 15, 2019, groundwater samples were collected from groundwater monitoring wells MW-8R and
MW-19. The maximum concentrations of selected dissolved -phase COCs found during the March 15, 2019
sampling events are summarized in the table below:
Maximum Groundwater Concentrations (March 15, 2019)
Chemical of
Monitoring Well
Concentration
North Carolina
Concern
ID
(mg/L)
Groundwater
(COC)
Quality (2L)
Standards
Sulfate
MW-19
1,150
250
Note: Concentration in Bold exceeds the applicable North Carolina GCL Standard
mg/L: milligrams per liter
Dissolved phase sulfate concentrations decreased compared to historical groundwater analytical data.
Dissolved phase sulfate was detected above the applicable North Carolina Groundwater Quality (2L)
Standard at groundwater monitoring well MW-19, 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 September 2019. Groundwater monitoring wells MW-8R and MW-19 will
be gauged to evaluate the potentiometric surface at the Site. Groundwater samples will be collected from
MW-8R, and MW-19 for analysis of sulfate by Standard Method 9056A. A Semi -Annual Groundwater
Monitoring Report documenting the proposed activities for 2019 will be submitted to the NCDEQ for review
and approval within 45-days of receipt of the laboratory analytical report.
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15t Semi -Annual Monitoring Report - 2019
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 #W10400198, 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
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15t Semi -Annual Monitoring Report - 2019
dissolved -phase sulfate concentrations are no longer detected above the North Carolina Groundwater
Quality (2L) Standards.
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15t Semi -Annual Monitoring Report - 2019
2.0 GROUNDWATER MONITORING
2.1 Groundwater Gauging
On March 15, 2019, Arcadis G&M of North Carolina, Inc. (Arcadis) personnel gauged
groundwater monitoring wells MW-8R and MW-19. 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 12.22 btoc in groundwater monitoring well MW-19 to 13.35 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 March 15, 2019, groundwater monitoring wells MW-8R and MW-19 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 Nashville,
Tennessee, 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 the March 15, 2019 groundwater
sampling event is included as Appendix B.
2.3 Groundwater Analytical Results
Groundwater analytical data from the March 15, 2019 groundwater sampling event indicated the
following:
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15t Semi -Annual Monitoring Report - 2019
• 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-19 (1,150 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 isoconcentration 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
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15t Semi -Annual Monitoring Report - 2019
4.0 CONCLUSIONS & RECOMMENDATIONS
Dissolved -phase sulfate was detected above the applicable 2L groundwater quality standard for
sulfate of 250 mg/L in groundwater monitoring well MW-19, only on March 15, 2019.
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 September 2019. Groundwater monitoring wells
MW-8R and MW-19 will be gauged to evaluate the potentiometric surface at the Site.
Groundwater samples will be collected from MW-8R and MW-19 for analysis of sulfate by
Standard Method 9056A. A Semi -Annual Groundwater Monitoring Report documenting the
proposed activities for 2019 will be submitted to the NCDEQ for review and approval within 45-
days of receipt of the laboratory analytical report.
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15t Semi -Annual Monitoring Report - 2019
TABLES
arcadis.com 10

Table 1
Monitoring Well Construction Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
Design b iat�c �
04ARCADISIfor ltancy
MW-3
In Use
Type II
99.03
20
2
NA -
NA
NA
MW-5
Abandoned
Type II
99.39
25.5
4
10.5 -
25.5
81.4
MW-5R
In Use
Type II
NS
20
2
10 -
20
NA
MW-6
In Use
Type II
98.68
25.5
4
10.5 -
25.5
80.7
MW-6i
In Use
Type III
99.26
55
2
50 -
55
46.8
MW-8
Abandoned
Type II
97.84
24
6
NA -
NA
NA
MW-8R
In Use
Type II
NS
20
2
10 -
20
NA
MW-14
In Use
Type II
100.44
22
4
7 -
22
85.9
MW-15
In Use
Type II
99.91
22
4
7 -
22
85.4
MW-16
In Use
Type II
97.42
25
2
10 -
25
79.9
MW-17
In Use
Type II
100.00
22
4
7 -
22
85.5
MW-18
In Use
Type II
NS
20
2
10 -
20
NA
MW-19
In Use
Type II
NS
20
2
10 -
20
NA
Notes:
1. Reported in feet below grade
2. Measured in feet relative to site datum
3. Conestoga Rover and Associates, a former consultant for this Site, previously reported that no reference was found to the following wells:
MW-1, MW-9, MW-10, MW-11, MW-12 or MW-13. These wells are presumed to be abandoned.
4. Monitoring wells MW-5 and MW-8 were abandoned on 5/19/2010 and replaced with monitoring wells MW-5R and MW-8R the same day.
5. Monitoring wells MW-18 and MW-19 were installated on October 25, 2011.
NA = Not Applicable / Available
NS = Not Surveyed
TOC = Top of Casing
Page 1 of 1

Table 2
Groundwater Elevation Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
04 ARC AU S Wft. $ Consaltgncy
fornatu and
hum assets
MW-8R 3/15/2019 NS ND 13.35 0.00 NM
MW-19 3/15/2019 NS ND 12.22 0.00 NM
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:
onsultEncy
wid
PARCADIS' Muilt.,,M
3/15/2019 3/15/2019
mg/L mg/L
60 1,150
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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1st SEMI-ANNUAL MONITORING REPORT-2019
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1st SEMI-ANNUAL MONITORING REPORT - 2019
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Design&Consultancy I
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r-/aRCJaDIS bd@assets

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381 KNOLLWOOD ST., WINSTON-SALEM, NORTH CAROLINA
1ST SEMI-ANNUAL MONITORING REPORT - 2019
MW-15 ' FORMER
VENT RISERS POTENTIOMETRIC SURFACE MAP
MARCH 15, 2019
O M.H.
FIGURE
Design&Consultancy I
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r-/aRCJaDIS bd@assets

•��
W
W
0
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8/20/2018
3/15/2019
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3/1/2018
8/20/2018
3/15/2019
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LEGEND:
— — —
PROPERTY LINE
ABANDONED GROUNDWATER MONITORING WELL
FORMER PRODUCT LINE
C.B.
CATCH BASIN
O M.H.
MAN HOLE
AREA LIGHT
• U.P.
UTILITY POLE
F.H.
FIRE HYDRANT
TELEPHONE
LARGE MANHOLE COVER
GROUNDWATER MONITORING WELL
mg/L
MILLIGRAMS PER LITER
LEGEND
Abbreviation
Constituent
2 L
SO4
Sulfate
250
NOTE:
1. THE NORTH CAROLINA 2L STANDARD FOR SULFATE IS 250 mg/L
2. VALUES IN BOLD EXCEED NORTH CAROLINA 2L STANDARDS.
0 30' 60'
GRAPHIC SCALE

O M.H.
O
O
UP
• up
1S411V'o
U.P.
ONCRETE
GRASS
EL CTRIC
PARKING M TER
LEGEND:
Mi -17
PROPERTY LINE
`
®
ABANDONED GROUNDWATER MONITORING WELL
FORMER PRODUCT LINE
'
C.B.
Q
CATCH BASIN
ASPHALT
TRASH
O M.H.
MAN HOLE
PARKING
ENCLOSURE
`
AREA LIGHT
MW-3
METAL
• U.P.
UTILITY POLE
F_
r
— — — — — —
SHED
METAL SHE
�Zo
F H
FIRE HYDRANT
LU
I
TELEPHONE
W
I
LARGE MANHOLE COVER
I
FORMER GASOLINE
FORMER
`
GROUNDWATER MONITORING WELL
'^
V/
UST AREA I
B SERVICE
(1,150)
SULFATE CONCENTRATION (mg/L)
STATION
0
— — — — —
MW-18 CONCRETE
`
250
ESTIMATED SULFATE CONCENTRATION CONTOUR
2L STANDARD (mg/L)
O
0
PAD
0,
e
o`
(mg/L)
MILLIGRAMS PER LITER
Fmw_5
MW-5R
MW-14
J
/S�9LO
MW-16
O
Z
FORMERPUMP
F.H. MIN l ISLAND (TYP)
MW-6i W-8R
(60)
I
FORMER
CANOPY
O
PARKING
NOTE:
1. THE NORTH CAROLINA 2L STANDARD FOR SULFATE IS 250 mg/L
2. SHADED VALUES EXCEED NORTH CAROLINA 2L STANDARDS.
.� MW-19
lr(1,150)1
J
I • FORMER
—
(��
I-(�I'9}
DIESEL UST
MW-6
AREA
FORMER PUMP
ISLAND(TYP)
II I
I CONCRETE
FO ER
TAN OLD
0 0 0 0
TT
0 30' 60'
FORMER
0 0 0 o
CANOPY
I
GRAPHIC SCALE
FORMER
VENT RISERS
ATLANTIC RICHFIELD COMPANY
00
C/O BP PRODUCTS NORTH AMERICA, INC.
p000
FORMER BP STATION 24163
381 KNOLLWOOD ST., WINSTON-SALEM, NORTH CAROLINA
1ST SEMI-ANNUAL MONITORING REPORT - 2019
MW-15 '
FORMER
VENT RISERS
SULFATE ISOCONCENTRATION MAP
MARCH 15, 2019
O M.H.
FIGURE
Design&Consultancy I
r /aRCICOIS Porftmseland 5
bd@assets

APPENDIX A
Historical Groundwater Elevation Data

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

Appendix A rn
Historical Groundwater Elevation Data. /aRCJaDIS tarnatur�tana
Former BP Service Station No. 24163 e� tafs
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
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
MW-5R
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
MW-6
98.68
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
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
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
MW-61
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 /��V1D� a
5 Historical Groundwater Elevation Data tir��u�ia�a��
Former BP Service Station No. 24163 a�u..
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
08/23/94
ND
12.14
0.00
85.70
03/21/95
ND
12.02
0.00
85.82
08/05/96
ND
11.99
0.00
85.85
11/17/98
ND
12.53
0.00
85.31
06/19/01
NM
NM
NM
NM
09/12/01
ND
12.67
0.00
85.17
12/27/01
14.47
15.03
0.56
83.26
MW 8
97.84
03/05/02
12.42
12.60
0.18
85.38
05/12/03
NM
NM
NM
NM
12/09/03
13.32
13.56
0.24
84.47
03/23/06
ND
12.15
0.00
85.69
05/08/07
ND
11.90
0.00
85.94
05/14/08
ND
11.95
0.00
85.89
05/28/09
ND
11.70
0.00
86.14
05/27/10
ND
12.97
0.00
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
MW-8R
NS
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
04/23/15
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
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 rn
Historical Groundwater Elevation Data. /aRCJaDIS tarnatur�tana
Former BP Service Station No. 24163 e� tafs
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
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
MW-15
9991
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
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
MW-16
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
NM
14.15
NM
85.85
MW-17
100.00
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 rn
Historical Groundwater Elevation Data. /aRCJaD I S tarnatu 31ana
Former BP Service Station No. 24163 e� tafs
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
-.-.
, • •,
10/31/11
ND
13.95
0.00
NM
05/22/12
ND
14.10
0.00
NM
06/14/12
ND
13.61
0.00
NM
07/09/12
ND
14.05
0.00
NM
08/14/12
ND
14.43
0.00
NM
09/19/12
ND
14.34
0.00
NM
12/05/12
ND
14.62
0.00
NM
02/26/13
ND
14.67
0.00
NM
05/31/13
ND
14.57
0.00
NM
08/28/13
ND
14.33
0.00
NM
11/07/13
ND
14.51
0.00
NM
MW-18
NS
02/27/14
ND
13.76
0.00
NM
06/02/14
ND
13.55
0.00
NM
10/16/14
ND
14.37
0.00
NM
04/23/15
ND
13.84
0.00
NM
10/13/15
ND
14.81
0.00
NM
04/28/16
ND
13.62
0.00
NM
09/19/16
ND
14.04
0.00
NM
03/03/17
ND
14.08
0.00
NM
09/20/17
ND
13.21
0.00
NM
03/01/18
ND
13.60
0.00
NM
08/20/18
ND
13.42
0.00
NM
10/31/11
ND
13.75
0.00
NM
05/22/12
ND
13.37
0.00
NM
06/14/12
ND
13.39
0.00
NM
07/09/12
ND
13.89
0.00
NM
08/14/12
ND
14.13
0.00
NM
09/19/12
ND
14.02
0.00
NM
12/05/12
ND
14.39
0.00
NM
02/26/13
ND
13.62
0.00
NM
05/31/13
ND
13.47
0.00
NM
08/28/13
ND
13.56
0.00
NM
11/07/13
ND
14.25
0.00
NM
MW-19 02/27/14
NS ND
13.17
0.00
NM
06/02/14
ND
13.14
0.00
NM
10/16/14
ND
14.03
0.00
NM
04/23/15
ND
13.46
0.00
NM
10/13/15
ND
14.01
0.00
NM
04/28/16
ND
13.38
0.00
NM
09/19/16
ND
13.75
0.00
NM
03/03/17
ND
13.79
0.00
NM
09/20/17
ND
13.48
0.00
NM
03/01/18
ND
13.42
0.00
NM
08/20/18
ND
13.38
0.00
NM
03/15/19
ND
12.22
0.00
NM
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
* - 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
ND = 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 — March
28, 2019

TestAmerica
THE LEADER IN ENVIRONMENTAL TESTING
ANALYTICAL REPORT
TestAmerica Laboratories, Inc.
TestAmerica Nashville
2960 Foster Creighton Drive
Nashville, TN 37204
Tel: [phone]
TestAmerica Job ID: 490-170333-1
TestAmerica SDG: 381 Knollwood St. Winston-Salem, North
Carolina
Client Project/Site: Former BP Facility #24163
For:
ARCADIS U.S., Inc.
5420 Wade Park Boulevard
Suite 350
Raleigh, North Carolina 27607
Attn: Paul Goodell
ie"ma..�,
Authorized for release by.
3/28/2019 11:22:45 PM
Jennifer Huckaba, Project Manager II
[phone]
[e-mail]
The test results in this report meet all 2003 NELAC and 2009 TNI requirements for accredited
parameters, exceptions are noted in this report. This report may not be reproduced except in full,
and with written approval from the laboratory. For questions please contact the Project Manager
at the e-mail address or telephone number listed on this page.
This report has been electronically signed and authorized by the signatory. Electronic signature is
intended to be the legally binding equivalent of a traditionally handwritten signature.
Results relate only to the items tested and the sample(s) as received by the laboratory.

Client: ARCADIS U.S., Inc. TestAmerica Job ID: 490-170333-1 F
Project/Site: Former BP Facility #24163 SDG: 381 Knollwood St. Winston-Salem, North Carolina
Table of Contents
CoverPage ..............................................
1
Table of Contents .........................................
2
Sample Summary .........................................
3
Case Narrative ...........................................
4
Definitions...............................................
5
Client Sample Results ......................................
6
QC Sample Results ........................................
8
QC Association ...........................................
9
Chronicle ................................................
10
Method Summary .........................................
11
Certification Summary ......................................
12
Chain of Custody ..........................................
13
TestAmerica Nashville
Page 2 of 14 3/28/2019

Sample Summary
Client: ARCADIS U.S., Inc. TestAmerica Job ID: 490-170333-1
Project/Site: Former BP Facility #24163 SDG: 381 Knollwood St. Winston-Salem, North Carolina
Lab Sample ID Client Sample ID Matrix Collected Received
490-170333-1 MW-8R Water 03/15/19 10:30 03/16/19 09:40
490-170333-2 MW-19 Water 03/15/19 10:00 03/16/19 09:40
TestAmerica Nashville
Page 3 of 14 3/28/2019

Case Narrative C
Client: ARCADIS U.S., Inc. TestAmerica Job ID: 490-170333-1
Project/Site: Former BP Facility #24163 SDG: 381 Knollwood St. Winston-Salem, North Carolina
Job ID: 490-170333-1
Laboratory: TestAmerica Nashville
Narrative
Job Narrative
490-170333-1
Comments
No additional comments.
Receipt
The samples were received on 3/16/2019 9:40 AM; the samples arrived in good condition, properly preserved and, where required, on ice
The temperature of the cooler at receipt was 2.00 C.
HPLC/IC
Method(s) 9056A: The matrix spike / matrix spike duplicate (MS/MSD) recoveries for 490-583274 were within the acceptance limits for
sulfate. However, the sample results exceeded the calibration curve limits: (490-170333-A-1 MS) and (490-170333-A-1 MSD).
No additional analytical or quality issues were noted, other than those described above or in the Definitions/Glossary page.
TestAmerica Nashville
Page 4 of 14 3/28/2019

Definitions/Glossary
Client: ARCADIS U.S., Inc. TestAmerica Job ID: 490-170333-1
Project/Site: Former BP Facility #24163 SDG: 381 Knollwood St. Winston-Salem, North Carolina
Qualifiers
HPLCAC
Qualifier Qualifier Description
4 MS, MSD: The analyte present in the original sample is greater than 4 times the matrix spike concentration; therefore, control limits are not
applicable.
E 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
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)
MDA Minimum Detectable Activity (Radiochemistry)
MDC Minimum Detectable Concentration (Radiochemistry)
MDL Method Detection Limit
ML Minimum Level (Dioxin)
NC Not Calculated
ND Not Detected at the reporting limit (or MDL or EDL if shown)
PQL Practical Quantitation Limit
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)
TestAmerica Nashville
Page 5 of 14 3/28/2019

Client Sample Results
Client: ARCADIS U.S., Inc.
Project/Site: Former BP Facility #24163
Client Sample ID: MW-8R
Date Collected: 03/15/19 10:30
Date Received: 03/16/19 09:40
Method: 9056A - Anions, Ion Chromatography
Analyte Result Qualifier RL
Sulfate 60.0 10.0
TestAmerica Job ID: 490-170333-1
SDG: 381 Knollwood St. Winston-Salem, North Carolina
Lab Sample ID: 490-170333-1
Matrix: Water
MDL Unit D Prepared
mg/L
Analyzed Dil Fac
03/26/19 07:06 10
TestAmerica Nashville
Page 6 of 14 3/28/2019

Client Sample Results
Client: ARCADIS U.S., Inc.
Project/Site: Former BP Facility #24163
Client Sample ID: MW-19
Date Collected: 03/15/19 10:00
Date Received: 03/16/19 09:40
Method: 9056A - Anions, Ion Chromatography
Analyte Result Qualifier RL
Sulfate 1150 50.0
TestAmerica Job ID: 490-170333-1
SDG: 381 Knollwood St. Winston-Salem, North Carolina
Lab Sample ID: 490-170333-2
Matrix: Water
MDL Unit D Prepared
mg/L
Analyzed Dil Fac
03/26/19 07:41 50
TestAmerica Nashville
Page 7 of 14 3/28/2019

QC Sample Results C
Client: ARCADIS U.S., Inc. TestAmerica Job ID: 490-170333-1
Project/Site: Former BP Facility #24163 SDG: 381 Knollwood St. Winston-Salem, North Carolina
Method: 9056A - Anions, Ion Chromatography
Lab Sample ID: MB 490-583274/3
Client Sample ID: Method Blank
Matrix: Water
Prep Type: Total/NA
Analysis Batch: 583274
L
MB MB
Analyte Result Qualifier
RL
MDL Unit D Prepared Analyzed Dil Fac
Sulfate
ND
1.00
mg/L 03/26/19 05:29 1
Lab Sample ID: LCS 490-583274/4
Client Sample ID: Lab Control Sample
Matrix: Water
Prep Type: Total/NA
Analysis Batch: 583274
Spike
LCS
LCS %Rec.
Analyte
Added
Result
Qualifier Unit D %Rec Limits
Sulfate
5.01
4.533
mg/L 91 80 -120
Lab Sample ID: LCSD 490-583274/5
Client Sample ID: Lab Control Sample Dup
Matrix: Water
Prep Type: Total/NA
Analysis Batch: 583274
Spike
LCSD
LCSD %Rec. RPD
Analyte
Added
Result
Qualifier Unit D %Rec Limits RPD Limit
Sulfate
5.01
4.533
mg/L 91 80 -120 0 20
Lab Sample ID: 490-170333-1 MS
Client Sample ID: MW-8R
Matrix: Water
Prep Type: Total/NA
Analysis Batch: 583274
Sample
Sample
Spike
MS
MS %Rec.
Analyte Result
Qualifier
Added
Result
Qualifier Unit D %Rec Limits
Sulfate 75.8
E
5.01
81.70
E 4 mg/L 118 80 -120
Lab Sample ID: 490-170333-1 MSD
Client Sample ID: MW-8R
Matrix: Water
Prep Type: Total/NA
Analysis Batch: 583274
Sample
Sample
Spike
MSD
MSD %Rec. RPD
Analyte Result
Qualifier
Added
Result
Qualifier Unit D %Rec Limits RPD Limit
Sulfate 75.8
E
5.01
81.55
E 4 mg/L 115 80 -120 0 20
TestAmerica Nashville
Page 8 of 14 3/28/2019

QC Association Summary
Client: ARCADIS U.S., Inc.
Project/Site: Former BP Facility #24163
HPLC/IC
Analysis Batch: 583274
Lab Sample ID
490-170333-1
490-170333-2
MB 490-583274/3
LCS 490-583274/4
LCSD 490-583274/5
490-170333-1 MS
490-170333-1 MSD
TestAmerica Job ID: 490-170333-1
SDG: 381 Knollwood St. Winston-Salem, North Carolina
Client Sample ID
Prep Type
Matrix
Method
MW-8R
Total/NA
Water
9056A
MW-19
Total/NA
Water
9056A
Method Blank
Total/NA
Water
9056A
Lab Control Sample
Total/NA
Water
9056A
Lab Control Sample Dup
Total/NA
Water
9056A
MW-8R
Total/NA
Water
9056A
MW-8R
Total/NA
Water
9056A
Prep Batch
0
TestAmerica Nashville
Page 9 of 14 3/28/2019

Client: ARCADIS U.S., Inc.
Project/Site: Former BP Facility #24163
Client Sample ID: MW-8R
Date Collected: 03/15/19 10:30
Date Received: 03/16/19 09:40
Lab Chronicle C
TestAmerica Job ID: 490-170333-1
SDG: 381 Knollwood St. Winston-Salem, North Carolina
Lab Sample ID: 490-170333-1
Matrix: Water
Batch
Batch
Dil Initial
Final Batch
Prepared
Prep Type
Type
Method
Run Factor Amount
Amount Number
or Analyzed Analyst Lab
Total/NA
Analvsis
9056A
10
583274
03/26/19 07:08 SW1 TAL NSH
Client Sample ID: MW-19 Lab Sample ID: 490-170333-2
Date Collected: 03/15/19 10:00 Matrix: Water
Date Received: 03/16/19 09:40
Batch Batch Dil Initial Final Batch Prepared
Prep Type Type Method Run Factor Amount Amount Number or Analyzed Analyst Lab
Total/NA Analysis 9056A 50 583274 03/26/19 07:41 SW1 TAL NSH
Laboratory References:
TAL NSH = TestAmerica Nashville, 2960 Foster Creighton Drive, Nashville, TN 37204, TEL [phone]
0
L
Page 10 of 14
TestAmerica Nashville
3/28/2019

Method Summary C
Client: ARCADIS U.S., Inc. TestAmerica Job ID: 490-170333-1
Project/Site: Former BP Facility #24163 SDG: 381 Knollwood St. Winston-Salem, North Carolina
Method Method Description Protocol Laboratory
9056A Anions, Ion Chromatography SW846 TAL NSH
Protocol References:
SW846 = "Test Methods For Evaluating Solid Waste, Physical/Chemical Methods", Third Edition, November 1986 And Its Updates.
Laboratory References:
TAL NSH = TestAmerica Nashville, 2960 Foster Creighton Drive, Nashville, TN 37204, TEL [phone]
TestAmerica Nashville
Page 11 of 14 3/28/2019

Accreditation/Certification Summary
Client: ARCADIS U.S., Inc.
Project/Site: Former BP Facility #24163
TestAmerica Job ID: 490-170333-1
SDG: 381 Knollwood St. Winston-Salem, North Carolina
Laboratory: TestAmerica Nashville
All accreditations/certifications held by this laboratory are listed. Not all accreditations/certifications are applicable to this report.
Authority
Program
EPA Region
Identification Number
Expiration Date
A2LA
ISO/IEC 17025
0453.07
12-31-19
Alaska (UST)
State Program
10
UST-087
06-30-19
Arizona
State Program
9
AZ0473
05-05-19
Arkansas DEQ
State Program
6
88-0737
04-25-19
California
State Program
9
2938
06-30-19
Connecticut
State Program
1
PH-0220
12-31-19
Florida
NELAP
4
E87358
06-30-19
Georgia
State Program
4
NA: NELAP & A2LA
12-31-19
Illinois
NELAP
5
200010
12-09-18'
Iowa
State Program
7
131
04-01-20
Kansas
NELAP
7
E-10229
10-31-19
Kentucky (UST)
State Program
4
19
06-30-19
Kentucky (WW)
State Program
4
90038
12-31-19
Louisiana
NELAP
6
30613
06-30-19
Maine
State Program
1
TN00032
11-03-19
Maryland
State Program
3
316
03-31-20
Massachusetts
State Program
1
M-TN032
06-30-19
Minnesota
NELAP
5
047-999-345
12-31-19
Mississippi
State Program
4
N/A
06-30-19
Nevada
State Program
9
TN00032
07-31-19
New Hampshire
NELAP
1
2963
10-09-19
New Jersey
NELAP
2
TN965
06-30-19
New York
NELAP
2
11342
03-31-19
North Carolina (WW/SW)
State Program
4
387
12-31-19
North Dakota
State Program
8
R-146
06-30-19
Ohio VAP
State Program
5
CL0033
07-06-19
Oklahoma
State Program
6
9412
08-31-19
Oregon
NELAP
10
TN200001
04-26-19
Pennsylvania
NELAP
3
68-00585
07-31-19
Rhode Island
State Program
1
LAO00268
12-30-19
South Carolina
State Program
4
84009 (001)
02-28-19 "
Tennessee
State Program
4
2008
02-23-20
Texas
NELAP
6
T104704077
08-31-19
USDA
Federal
P330-13-00306
12-01-19
Utah
NELAP
8
TN00032
07-31-19
Virginia
NELAP
3
460152
06-14-19
Washington
State Program
10
C789
07-19-19
West Virginia DEP
State Program
3
219
02-28-19'
Wisconsin
State Program
5
998020430
08-31-19
Wyoming (UST)
A2LA
8
453.07
12-31-19
" Accreditation/Certification renewal pending - accreditation/certification considered valid.
TestAmerica Nashville
Page 12 of 14 3/28/2019

Test medca
THE LEADER IN ENVIRONIv1ENTAL TESTING
Nashville, TN COOLER RECEIPT FORM 490-170333 Chain of Custody
Cooler Received/Opened On 03-16-2019_@_09:40
1 11r/
Time Samples Removed From Cooler is Time Samples Placed In Storage ` Iv (2 Hour Window)
1. Tracking # ( (last 4 digits, FedEx) Courier: _FedEx_
IR Gun ID_31470368 pH Strip Lot1Y1114 Chlorine Strip Lot
2. Temperature of rep. sample or temp blank when opened:""% - D Degrees Celsius
3. If Item #2 temperature is 0°C or less, was the representative sample or temp blank rozen?
YY/E''S�� NO...O
4. Were custody seals on outside of cooler?
KES..NO... NA
If yes, how many and where: %d"
5. Were the seals intact, signed, and dated correctly?
6E.. N0...NA
6. Were custody papers inside cooler?
NO NA
I certify that I opened the cooler and answered questions 1-6 (intial)
7. Were custody seals on containers: YES 490 and Intact
YES ... NO..(!!�
Were these signed and dated correctly?
YES ... NO.. 1&
8. Packing mat'I used? bble p PlasticbagPeanuts Vermiculite Foam Insert Paper Other None
9. Cooling process: -lee Ice -pack Ice (direct contact) Dry ice
Other None
10. Did all containers arrive in good condition (unbroken)?
..NO ... NA
11. Were all container labels complete (#, date, signed, pres., etc)?
&...NO ... NA
12, Did all container labels and tags agree with custody papers?
FS.?.NO... NA
13a. Were VOA vials received? YES..(...NA
b. Was there any observable headspace present in any VOA vial? YES ... NO. &
AMIL
UP 40 Larger than this.
14. Was there a Trip Blank in this cooler? YES... 61NA If multiple coolers, sequence #
I certify that I unloaded the cooler and answered questions 7-14 (intial)
15a. On pres'd bottles, did pH test strips suggest preservation reached the correG pH level? YES ... NO.,ddZA
b. Did the bottle labels indicate that the correct preservatives were used )?S... NO ... NA
16. Was residual chlorine present? YES ... NO ... to
I certify that I checked for chlorine and pH as per SOP and answered questions 15-16 (intial) �!
17. Were custody papers properly filled out (ink, signed, etc)? /rrSNO ..NA
18. Did you sign the custody papers in the appropriate place? � ...
. NO ... NA
19. Were correct containers used for the analysis requested? �...NO...NA
20. Was sufficient amount of sample sent in each container? ... NO ... NA
I certify that 1 entered this project into LIMS and answered questions 17-20 (intial) / l
1 certifv that I attached a label with the unique LIMS number to each container (intial)
21. Were there Non -Conformance issues at login? YES...t t) Was a NCM §enerated? YES. ... #
B1S = Broken in shipment
Cooler Receipt Fonn.doc LF-1
End of Fonn
Revised 8/23/17
I
i
3/28/2019
Page 13 of 14

CD
O
W
N
of
N
O
Loc: 490
170333
%stAmer ica Nash
"A�'
Creighton
Creighton
177
Phoee:800-765-0980
Faster
2960 Foster
Toll Free: 800-768.0980
THE LEADER IN ENVIRONMENTAL TESTING Nashville, TN 37204
Fax: [phone]
Consultant Name: ARCADIS
TA Account#: PO#:
Address: 111-D Sanders Lane
Invoice To: ACCOUNTSPAYABLE ADMINISTRATION(a�ARCADIS-US.COM
City/Statelzp: BLUEFIELD, VA 24605
Report To: Paul Goodell
Consultant Project Mgr. Paul Goodell
Project Name: Former RP Facility 424163
Consultant Telephone Number. 919-4152327
Fax No.: 276-322-3946
Retail # (MRN #): 24163
Sampler Name: (Print) - "Wl'L;.'1t
'. s..
Major Project (AFE#):
Sampler Signature:
Site Address 381 Knolhwocd St
2J
City, State, rip Winston-Salem, North Carolina
Regulatory District (CA)
-
N
❑
a.
y
@
N
a
w
E
6
o
$-
o
y
z
o
=
z
N
F
=
F-
x
OA
m
Sample ID or Field ID
❑
F-
Q
U
-
U�
i
—
O
y
¢
LL
❑'
ji
01V
MW-8R
1
x
1
x
MW-19�
/
1
x
1
x
Comments/Special Instructions:
Laboratory Comments: �j(
Temperature Upon Receipt of /� 9
Sample Containers Intact? N
VOCs Free of Headspace? Y N
QC Deliverables (please cimla one)
Level Levc13 Level4 Other
Rey ish
®
Date
Time
C
Received by:
Date
Tme
y
_i j P7
f/
Relirga ed by
Date
Time
Received by:
Date
Time
tf
' It Ail be the responsibility of BP or its
ca
consultantto notifythe TestAmeriProject Manager
by ph --fax that a rush sample willbe submitted.
Relinquished by:
Date
Time
Received by TestA dca:
Date
34w �) .�
Tme
lC;,,//"J
1�l
f
(J
TA Project Manager. Date:
7�

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
P ARCADIS (ornaturalanA
hullr assets
NC GCL:
5,000
84,500
260,000
85,500
20,000
NE
NE
NC 2L
1
600
600
500
20
250
NE
Units:
Ng/I
Ng/I
Ng/I
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
0.4 J
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
1.1 J
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
3/23/2006 i1i
11,000
2,370
30,700
13,200
15,400
5/8/2007
7,410
1,590
21,100
8,920
8,830
5/8/2007 (1)
7,400
1,680
20,100
9,290
9,360
MW-5
5/14/2008
10,000
2,100
29,000
12,000
18,000
5/14/2008 (1)
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 (1)
6,510
2,240
22,100
12,900
6,510
5/27/2010
6,610
2,810
24,300 J
15,700
4,330
5/27/2010 (1)
6,090
2,380
30,100 J
13,300
4,250
10/31/2011
7,960
2,660
28,000
13,800
3,830
< 1
< 5
10/31/2011 (1)M
8,360
2,870
1 24,600
14,800
4,070
5/22/2012
IL 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
1,1501
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
3/1 /2018
163
8/20/2018
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
P ARCADIS (ornaturalanA
hullr assets
NC GCL:
NC 2L
Units:
5,000
1
Ng/I
84,500
600
Ng/I
260,000
600
Ng/I
85,500
500
Ng/I
20,000
20
Ng/I
NE
250
mg/I
NE
NE
mg/I
5/12/2003
< 0.5
0.52 J
< 0.5
< 1
3
12/9/2003
2.3
0.64 J
1.1
3.6
17.6
12/9/2003
2.4
0.68 J
1.1
3.8
18
3/23/2006
0.76 J
0.59 J
3.6
2.8 J
1.1
5/8/2007
< 0.5
< 0.5
< 0.5
< 1
< 0.5
MW-6
5/14/2008
< 0.5
< 0.8
< 0.7
< 0.8
< 0.5
5/28/2009
< 0.06
< 0.05
< 0.06
< 0.14
0.17 J
5/27/2010
< 0.11
0.13 J
0.38 J
0.46 J
< 0.12
10/31/2011
8.7 J
11.7 J
27.5 J
132 J
< 0.26 UJ
131
2,130
6/2/2014
17.6 J
59.4 J
31.6 J
99.4 J
783 J
5/12/2003
< 0.5
< 0.5
< 0.5
1.1 J
< 0.5
12/9/2003
< 2.5
< 2.5
< 2.5
< 5
< 2.5
3/23/2006
49.7
18.9
48.7
443
3,560
5/8/2007
< 25
< 25
< 25
< 50
6,910
MW-61
5/14/2008
5.2 J
< 2
< 1.8
< 2
3,400
5/28/2009
2.5
< 0.05
< 0.06
< 0.14
1,150
5/27/2010
1.6 J
< 1.1
< 1.1
< 3.2
492
10/31/2011
0.41 J
< 0.36
< 0.32
< 0.75
122
< 1
76.1
6/2/2014
< 0.1
< 0.1
< 0.1
< 0.2
3.3
3/23/2006
671
1,340
1,230
8,100
124
5/8/2007
1,160
799
196
2,990
1,440
MW 8
5/14/2008
600
1,800
700 3,,000
190
5/28/2009
1,390
2,050
357
_3,310
1,560
5/27/2010
8,570
2,870
31,700
15,700
6,260
10/31/2011
8,000
3,180
32,100
17,200
3,170
<1
<5
5/22/2012
8,270 +
3,360
36,400 J
17,800
3,920
< 5
119
6/15/2012 (2)
726
47 J
760
242 J
96.3 J
4,760
22,200
7/9/2012
4,540 J
1,870 J
17,100 J
10,800 J
1,530 J
6,570
4,500
8/14/2012
4,370
1,610
19,300
8,780
2,000
7,010
1,560
9/19/2012
4,780
1,800
20,900
10,400
2,600
6,700
1,100
12/5/2012
7,760
2,440
31,900
13,800
4,560
2,410
635
2/26/2013
7,310
2,480
30,500
13,400
4,530
959
590
5/31/2013
6,540 ,
3,040
30,500
12,500
4,200
439
437
8/28/2013
1,600
628
5,390
3,990
1,380
4,770
703
11/7/2013
1,130
329
2,440
1,830
1,770
7,460
766
MW-8R
2/27/2014
1,020
603
3,200
3,430
1,190
7,670
940
6/2/2014
1,360 J
680 J
3,510 J
3,330 J
2,110 J
6/2/20141'i
1,540
556 J
3,650
2,630 J
2,640 J
10/16/2014
3,310
883
9,070
4,990
3,910
3,560
842
4/23/2015
2,050
812
10/13/2015
1,600
4/29/2016
1,640
9/19/2016
1,330
3/3/2017
--
--
--
--
--
1,720
--
9/20/2017
--
797
3/1/2018
--
677
8/20/2018
--
436
3/15/2019
60
5/12/2003
< 0.5
_--
< 0.5
< _--
0.5
< 1
_
0.5271
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
<0.42U
<0.3
<0.13
43.2
<5
6/3/2014
<0.1
<0.1
<0.1
<0.2
<0.1
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
P ARCADIS (ornaturalanA
hullr assets
NC GCL:
5,000
84,500
260,000
85,500
20,000
NE
NE
NC 2L
1
600
600
500
20
250
NE
Units:
Ng/I
Ng/I
Ng/I
Ng/I
Ng/I
mg/I
mg/I
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
<01
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
0.92
417 J
< 0.1
5/13/2003
57
_25
<.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
MW-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
--
9/20/2017
257
3/1 /2018
253
8/20/2018
173
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
P ARCADIS (ornaturalanA
hullr assets
INC GCL:
5,000
84,500
260,000
85,500
20,000
NE
NE
INC 2L
1
600
600
500
20
250
NE
Units:
pg/I
pg/I
pg/I
pg/I
pg/I
mg/I
mg/I
10/31/2011
2,390
1,380
8,790
7,040
5,160
3.7
425
5/22/2012
2,700
1,560
14,200
7,940
4,880
<5
310
6/15/201212i
4,020
1,440
18,200
7,940
3,290
1,090
6,520
7/9/2012
5,130
2,910
30,400 J
16,300
5,330
232
991
8/14/2012
2,420
1,650
14,200
8,370
4,090
469
1,080
9/19/2012
2,090
1,630
12,900
8,640
3,960
260
690
12/5/2012
2,320
1,810
15,200
10,400
4,010
58.8
588
2/26/2013
2,210
1,110
10,600
6,990
3,890
169
503
5/31/2013
1,830
894
8,820
5,250
3,120
1,530
606
8/28/2013
2,710 J
1,190 J
13,100
7,420 J
3,240 J
2,660
525
11/7/2013
2,020
984
9,850
5,620
2,260
2,890
255
MW-19 2/27/2014
2,550
1,400
10,900
7,880
3,320
2,790
322
6/2/2014
2,370
1,260
11,900
7,260
2,830
10/16/2014
2,340
632
4/23/2015
2,540
514
10/13/2015
1,960
4/28/2016
1,780
9/19/2016
1,270
3/3/2017
941
9/20/2017
1,020
3/1 /2018
745
8/20/2018
806
3/15/2019
1,150
Notes:
I'i Field duplicate
i21Alkalinity, 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
-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

04ARCADIS5deign&Consultancy
for naturaland
built assets
Arcadis U.S., Inc.
111-D Sanders Lane
Bluefield, Virginia 24605
Tel [phone]
Fax [phone]
www.arcadis.com