WI0400198_Monitoring (Report)_20181001

ARCADIS Design sr Consultancy
fornaturaland
built assets
Mr. Michael Rogers
UIC Program Manager
NCDEQ — DWR
1636 Mail Service Center
Raleigh, North Carolina 27699
Subject:
2nd Semi -Annual Groundwater Monitoring Report — 2018
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 2nd Semi -Annual Groundwater Monitoring Report — 2018 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:
October 1, 2018
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.
2ND SEMI-ANNUAL MONITORING
REPORT - 2018
Former BP Facility #24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
NCDEQ Incident #6400 (Closed)
Injection Permit #W10400198
September 2018

21 Semi -Annual Monitoring Report - 2018
Hardik Patel
AFS Task Manager 3
Paul Goodell, E.I.
AFS Project Manager 5
C. Scott Bostian, P.E; q IT J.-Z-e j � -
North Carolina P.E. No. 25659 r
Senior Eri�lneer
\K
2N° SEMI-ANNUAL
MONITORING REPORT
-2018
Prepared for.
Atlantic Richfield Company
c/o SP Products North America, Inc.
Mr. Greg Frisch — Project Manager
4850 E. 491h Street
MBC-3 Room 155C
Cuyahoga Heights, Ohio 44125
Tel [phone]
Prepared by:
Arcadis G&M of North Carolina, Inc.
801 Corporate Center Drive
Suite 300
Raleigh, North Carolina 27607
Tel 919.854,1282
Fax [phone]
www arc.edia-us.com
Environmental
Our Ref.:
GPI6BPNA.NC10
Date:
September 18, 2018
This document is intended only for the use of
the individual or entity for which ii 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.
n

2"d Semi -Annual Monitoring Report - 2018
2nd Semi -Annual Monitoring Report - 2018
Former SP Facility #24163
381 Knollwood St
Winston-Salem, Forsyth County, North Carolina
Latitude 360 5' 25.94"N Longitude 80117' 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 Party -
Property Owner.
Low (No Further Action)
Dissolved -phase Sulfate
concentrations above
groundwater quality standards
(2L)
Industrial/Commercial
Former gasoline UST systera(s)
1983
Unknown
Former UST System
Atlantic Richfield Company
c/o BP Products North America,
Inc.
Attn: Greg Frisch
4850 East 49"' 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
(301) 98&2925 ext. 215
a Professional Engineer for Arcadis G&M of North
Carolina; Inc., do cert#yr that .the information contained in this report is correct and accurate to the best of
my knowledge. - Arr-adis G&M of North Carolina, Inc, is licensed to practice geology and engineering in
North-C,brolina. The eedfication numbers of the company are C-155 (geology) and C-1869 (engineering).

2nd Semi -Annual Monitoring Report - 2018
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 - August 20, 2018
Figure 4. Groundwater Analytical Data - March 2017 - August 2018
Figure 5. Sulfate Isoconcentration Map - August 20, 2018
APPENDICES
A- Historical Groundwater Elevation Data
B- Laboratory Analytical Report and Chain -of -Custody Record — August 20, 2018
C- Historical Groundwater Analytical Data
3
5
5
5
5
6
7
8
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2"d Semi -Annual Monitoring Report - 2018
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 August 20, 2018. 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 August 20, 2018, Arcadis completed a semi-annual groundwater monitoring and sampling
event at the Site. Four (4) groundwater monitoring wells (MW-5R, MW-8R, MW-18, and MW-19)
were gauged to determine the depth to water (DTW). DTW ranged from 13.38 feet below top of
casing (btoc) in groundwater monitoring well MW-19 to 13.61 feet btoc in groundwater monitoring
well MW-5R. The historical groundwater flow direction for the Site is towards the southeast.
On August 20, 2018, groundwater samples were collected from groundwater monitoring wells
MW-5R, MW-8R, MW-18, and MW-19. The maximum concentrations of selected dissolved -phase
COCs found during the August 20, 2018 sampling events are summarized in the table below:
Maximum Groundwater Concentrations (August 20, 2018)
Chemical of
Monitoring Well
Concentration
North Carolina
Concern
ID
(mg/L)
Groundwater
(COC)
Quality (2L)
Standards
Sulfate
MW-19
806
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 wells MW-8R and MW-19.
Arcadis recommends discontinuing semi-annual sampling of groundwater monitoring well MW-5R
as dissolved -phase sulfate concentrations at this location have not exceeded the applicable North
Carolina 2L Standards for two or more consecutive semi-annual sampling event. Arcadis
additionally recommends discontinuing semi-annual sampling of groundwater monitoring well
MW-18 as dissolved -phase sulfate concentrations at this location do not currently exceed the
applicable North Carolina 2L Standards.
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 March 2019. Groundwater monitoring wells MW-
8R and MW-19 will be gauged to evaluate the potentiometric surface at the Site. Groundwater
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2"d Semi -Annual Monitoring Report - 2018
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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2"d Semi -Annual Monitoring Report - 2018
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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2"d Semi -Annual Monitoring Report - 2018
dissolved -phase sulfate concentrations are no longer detected above the North Carolina Groundwater
Quality (2L) Standards.
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2"d Semi -Annual Monitoring Report - 2018
2.0 GROUNDWATER MONITORING
2.1 Groundwater Gauging
On August 20, 2018, Arcadis G&M of North Carolina, Inc. (Arcadis) personnel gauged
groundwater monitoring wells MW-5R, MW-8R, MW-18, 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 13.38 btoc in groundwater monitoring well MW-19 to 13.61 feet btoc in
groundwater monitoring well MW-5R.
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 August 20, 2018, groundwater monitoring wells MW-5R, MW-8R, MW-18, 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 rz 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 August 20, 2018 groundwater
sampling event is included as Appendix B.
2.3 Groundwater Analytical Results
Groundwater analytical data from the August 20, 2018 groundwater sampling event indicated the
following:
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2"d Semi -Annual Monitoring Report - 2018
• 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 wells MW-8R (436 mg/L) and MW-19 (806 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.
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2"d Semi -Annual Monitoring Report - 2018
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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2"d Semi -Annual Monitoring Report - 2018
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 wells MW-8R and MW-19 on August 20, 2018.
Arcadis recommends discontinuing semi-annual sampling of groundwater monitoring well MW-5R
as dissolved -phase sulfate concentrations at this location have not exceeded the applicable North
Carolina 2L Standards for two or more consecutive semi-annual sampling event. Arcadis
additionally recommends discontinuing semi-annual sampling of groundwater monitoring well
MW-18 as dissolved -phase sulfate concentrations at this location do not currently exceed the
applicable North Carolina 2L Standards.
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 March 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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2"d Semi -Annual Monitoring Report - 2018
TABLES
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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-5R
8/20/2018
NS
ND
13.61
0.00
NM
MW-8R
8/2012018
NS
ND
13.52
0.00
NM
MW-18
8/20/2018
NS
ND
13.42
0.00
NM
MW-19
8/20/2018
NS
ND
13.38
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 8/20/2018
Units mg/L
Sulfate 147
Notes:
mg/L - milligrams per liter
onsultEncy
wid
PARCADIS' Muilt.,,M
8/20/2018 8/20/2018 8/20/2018
mg/L mg/L mg/L
436 173 806
BOLD text indicates exceendance of NC groundwater standard 2L for sulfate (250 mg/L).
Page 1 of 1

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•
FT AMSL
FEET ABOVE MEAN SEA LEVEL
����Lu/
FORMUSFORMER
GASOLINE
`
T AREAI
BP SERVICE
I_____
STATION
MW-18 CONCRETE
NOTE:
O
(NSVD) PAD
1. MONITORING WELL LOCATIONS ARE APPROXIMATE.
40
0
°
2. THE SITE
IS A VACANT PARKING LOT. ALL SITE FEATURES EXCEPT
PARKING
LOT CURBS AND ROADWAYS REPRESENT FORMER SITE
MW-5-- MW-5R
MW-14*
CHARACTERISTICS.
J
I (NSVD)
MW-8 - - -
-I
O
sI
MW-16
O
Z
F.H. I FORMER PUMP
�` ISLAND (TYP)
� MW-8R
MW-6i YYY (NSVD)
FORMER
CANOPY
�Q
PARKING
I
J
MW-19
FORMER DIESEL
(NSVD) USTiREA
_
L
MW-6 I
FORMER PUMP
'
ISLAND(TYP)
I
CONCRETE
FOF AER
TAN OLD
0 0
0 30' 60'
FORMER
o
•
UO
CANOPY
I
GRAPHIC SCALE
❑
-
I
FORMER
VENT RISERS
ATLANTIC RICHFIELD COMPANY
C/O BP PRODUCTS NORTH AMERICA, INC.
OD0
FORMER BP STATION 24163
381 KNOLLWOOD ST., WINSTON-SALEM, NORTH CAROLINA
2nd SEMI-ANNUAL MONITORING REPORT - 2018
OG0 MW 1+ 00
FORMER
VENT RISERS
POTENTIOMETRIC SURFACE MAP
AUGUST 20, 2018
O M.H.
FIGURE
PARCADIS Wilt�aswtsnd I

MW-16
gm
sm
K z
0
2F
as
0
_O
O 0
O
VU
a0
WV
O
❑a
ga
�m
o
W
W
0
0
J
J
0
Z
MW-8R
Date
3/3/2017
9/20/2017
3/1/2018
8/20/2018
SO4
1,720
797
677
1 436
M.H.
0
MW-18
Date
3/3/2017
9/20/2017
3/1/2018
8/20/2018
SO4
295
1 257
253
173
MW-5R
Date
3/3/2017
9/20/2017
3/1/2018
8/20/2018
SO4
1 3,570
1 1,060
163
147
MW-19
Date
373/2017
9/20/2017
3/1/2018
8/20/2018
SO4
941
1,020
745
806
— — —
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

o0
z o
OM
OQ
Yo
�Z
mo
O M.H.
O
• U.P. • U.P.
/S<ANO
• U.P.
ONCRETE
GRASS EL ECTRIC
PARKING MITER
LEGEND:
M i -17
T
PROPERTY LINE
`
f
ABANDONED GROUNDWATER MONITORING WELL
FORMER PRODUCT LINE
'
C.B.
CATCH BASIN
ASPHALT
TRASH
O M.H.
MAN HOLE
PARKING
ENCLOSURE
`
AREA LIGHT
MW-3
METAL
SHED
r
• U.P.
UTILITY POLE
F — — — — — —
METAL SHED
v2o
F.H.
FIRE HYDRANT
W
I
TELEPHONE
W
I
•
L—I
LARGE MANHOLE COVER
FORMER GASOLINE
FORMER
`
GROUNDWATER MONITORING WELL
UST AREA I
BP SERVICE
(806)
SULFATE CONCENTRATION (mg/L)
STATION
MW-18
Y50
ESTIMATED SULFATE CONCENTRATION CONTOUR
CONCRETE
2L STANDARD (mg/L)
O
(173) PAD
°0
(mg/L)
MILLIGRAMS PER LITER
O
e
-- MW-5R
MW-14*
J
MW-5 (147)
MW 16
J
O
Z
F.H.
(`}r
l
MW-6i
IMW-g FORMER PUMP
i ` ISLAND (TYP)
�
L �� `MW-8R
�(436)
I
FORMER
CANOPY
O s�9yO
`
PARKING
NOTE:
1. THE NORTH CAROLINA 2L STANDARD FOR SULFATE IS 250 mg/L
2. SHADED VALUES EXCEED NORTH CAROLINA 2L STANDARDS.
Is0 MW-19 `
J
—A(806)
�
` FOEMER DIESEL
SST AREA
I
_
I
`
MW-6
FORMERPUMP
'
ISLAND (TYP)
I
CONCRETE
FO ER
TAN OLD
0 0 o
'Fb0
FORMER
T
0 30 60 '
0 o
• UO
CANOPY
I
GRAPHIC SCALE
❑
—
I
FORMER
00
VENT RISERS
ATLANTIC RICHFIELD COMPANY
C/O BP PRODUCTS NORTH AMERICA, INC.
ODp
FORMER BP STATION 24163
381 KNOLLWOOD ST., WINSTON-SALEM, NORTH CAROLINA
2nd SEMI-ANNUAL MONITORING REPORT - 2018
OG0
00
MW 15
FORMER
VENT RISERS
SULFATE ISOCONCENTRATION MAP
AUGUST 20, 2018
O M.H.
FIGURE
PARCADIS Wilt.aswts�d I

APPENDIX A
Historical Groundwater Elevation Data

Appendix A �/�
Historical Groundwater Elevation Data /aRCJaDIS r°'nar"pia"a
Former BP Service Station No. 24163 hulf,°s°ets
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
• Depth
Depth
Well Date
Elevation LNAPL
btoc)
Groundwater
btoc)
Thickness
Groundwater
Elevation
06/24/93
®(feet
ND
(feet
13.89
(feet)
0.00
(1)(2)
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 6

Appendix A �/�
Historical Groundwater Elevation Data /aRCJaDIS r°'nar"pia"a
Former BP Service Station No. 24163 hulf,°s°ets
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
•
Depth
Depth
Well Date
Elevation
®(feet
ILNAPIL
btoc)
Groundwater
(feet btoc)
Thickness
(feet)
Groundwater
Elevation (1)(2)
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
k 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-6i 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 6

Appendix A �/�
Historical Groundwater Elevation Data /aRCJaDIS r°'nar"pia"a
Former BP Service Station No. 24163 hulf,amets
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
•
Depth
Depth
Well Date
Elevation
®(feet
ILNAPIL
btoc)
Groundwater
(feet btoc)
Thickness
(feet)
Groundwater
Elevation (1)(2)
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
MW-8R 11/07/13
NS
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
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
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 6

Appendix A �/�
Historical Groundwater Elevation Data /aRCJaDIS r°'nar"pia"a
Former BP Service Station No. 24163 hulf,amets
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
•
Depth
Depth
Well Date
Elevation
®(feet
ILNAPIL
btoc)
Groundwater
(feet btoc)
Thickness
(feet)
Groundwater
Elevation (1)(2)
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
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
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 6

Appendix A �/�
Historical Groundwater Elevation Data /aRCJaDIS r°'nar"pia"a
Former BP Service Station No. 24163 hulf,°s°ets
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
• Depth
Depth
Well Date
Elevation LNAPL
®(feet btoc)
Groundwater
(feet btoc)
Thickness
(feet)
Groundwater
Elevation (1)(2)
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
NS
02/27/14
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
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
Page 5 of 6

Appendix A
Historical Groundwater Elevation Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
� ARCJ�D I o�,9itassetsii- ' �,11""Y
haA
- During the May 2003 sampling event LNAPL was observed in MW-5. Depth to groundwater and thickness of LNAPL
were not measured.
Page 6 of 6

APPENDIX B
Laboratory Analytical Report and Chain -of -Custody Record — August
20, 2018

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: 490-157783-1
TestAmerica SDG: 381 Knollwood St, Winston-Salem, NC
Client Project/Site: BP #24163 - Winston-Salem, NC
ror:
ARCADIS U.S., Inc.
801 Corporate Center Drive
Suite 300
Raleigh, North Carolina 27607-5073
Attn: Paul Goodell
Authorized for release by.
8/29/2018 11:05:59 AM
Leah Klingensmith, Senior Project Manager
[phone]
[e-mail]
Designee for
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.
Project/Site: BP #24163 - Winston-Salem, NC
TestAmerica Job ID: 490-157783-1
SDG: 381 Knollwood St, Winston-Salem, NC
Table of Contents
CoverPage ..............................................
1
Table of Contents .........................................
2
Sample Summary .........................................
3
Case Narrative ...........................................
4
Definitions...............................................
5
Client Sample Results ......................................
6
QC Sample Results ........................................
10
QC Association ...........................................
11
Chronicle................................................
12
Method Summary .........................................
13
Certification Summary ......................................
14
Chain of Custody ..........................................
15
TestAmerica Nashville
Page 2 of 16 8/29/2018

Sample Summary
Client: ARCADIS U.S., Inc.
TestAmerica Job ID: 490-157783-1
Project/Site: BP #24163 - Winston-Salem, NC
SDG: 381 Knollwood St, Winston-Salem, NC
Lab Sample ID Client Sample ID
Matrix
Collected Received
490-157783-1 MW-5R
Water
08/20/18 13:05 08/21/18 09:30
490-157783-2 MW-8R
Water
08/20/18 12:55 08/21/18 09:30
490-157783-3 MW-18
Water
08/20/18 13:15 08/21/18 09:30
490-157783-4 MW-19
Water
08/20/18 12:45 08/21/18 09:30
TestAmerica Nashville
Page 3 of 16 8/29/2018

Case Narrative
Client: ARCADIS U.S., Inc.
Project/Site: BP #24163 - Winston-Salem, NC
Job ID: 490-157783-1
Laboratory: TestAmerica Nashville
Narrative
TestAmerica Job ID: 490-157783-1
SDG: 381 Knollwood St, Winston-Salem, NC
0
Job Narrative
490-157783-1
Comments
No additional comments.
Receipt
The samples were received on 8/21/2018 9:30 AM; the samples arrived in good condition, properly preserved and, where required, on ice
The temperature of the cooler at receipt was 1.41 C.
HPLC/IC
No analytical or quality issues were noted, other than those described in the Definitions/Glossary page.
TestAmerica Nashville
Page 4 of 16 8/29/2018

Definitions/Glossary
Client: ARCADIS U.S., Inc.
Project/Site: BP #24163 - Winston-Salem, NC
Glossary
Abbreviation
a
% R
CFL
CNF
DER
Dil Fac
DL
DL, RA, RE, IN
DLC
EDL
LOD
LOQ
MDA
MDC
MDL
ML
NC
ND
PQL
QC
RER
RL
RPD
TEF
TEQ
TestAmerica Job ID: 490-157783-1
SDG: 381 Knollwood St, Winston-Salem, NC
These commonly used abbreviations may or may not be present in this report.
Listed under the "D" column to designate that the result is reported on a dry weight basis
Percent Recovery
Contains Free Liquid
Contains No Free Liquid
Duplicate Error Ratio (normalized absolute difference)
Dilution Factor
Detection Limit (DoD/DOE)
Indicates a Dilution, Re -analysis, Re -extraction, or additional Initial metals/anion analysis of the sample
Decision Level Concentration (Radiochemistry)
Estimated Detection Limit (Dioxin)
Limit of Detection (DoD/DOE)
Limit of Quantitation (DoD/DOE)
Minimum Detectable Activity (Radiochemistry)
Minimum Detectable Concentration (Radiochemistry)
Method Detection Limit
Minimum Level (Dioxin)
Not Calculated
Not Detected at the reporting limit (or MDL or EDL if shown)
Practical Quantitation Limit
Quality Control
Relative Error Ratio (Radiochemistry)
Reporting Limit or Requested Limit (Radiochemistry)
Relative Percent Difference, a measure of the relative difference between two points
Toxicity Equivalent Factor (Dioxin)
Toxicity Equivalent Quotient (Dioxin)
TestAmerica Nashville
Page 5 of 16 8/29/2018

Client Sample Results C
Client: ARCADIS U.S., Inc. TestAmerica Job ID: 490-157783-1
Project/Site: BP #24163 - Winston-Salem, NC SDG: 381 Knollwood St, Winston-Salem, NC
Client Sample ID: MW-5R Lab Sample ID: 490-157783-1
Date Collected: 08/20/18 13:05 Matrix: Water
Date Received: 08/21/18 09:30
Method: 9056A - Anions, Ion Chromatography
Analyte Result Qualifier
Sulfate 147
RL MDL Unit D Prepared Analyzed Dil Fac
20.0 mg/L 08/22/1815:08 20
TestAmerica Nashville
Page 6 of 16 8/29/2018

Client Sample Results C
Client: ARCADIS U.S., Inc. TestAmerica Job ID: 490-157783-1
Project/Site: BP #24163 - Winston-Salem, NC SDG: 381 Knollwood St, Winston-Salem, NC
Client Sample ID: MW-8R Lab Sample ID: 490-157783-2
Date Collected: 08/20/18 12:55 Matrix: Water
Date Received: 08/21/18 09:30
Method: 9056A - Anions, Ion Chromatography
Analyte Result Qualifier
Sulfate 436
RL MDL Unit D Prepared Analyzed Dil Fac
100 mg/L 08/22/1815:44 100
TestAmerica Nashville
Page 7 of 16 8/29/2018

Client Sample Results C
Client: ARCADIS U.S., Inc. TestAmerica Job ID: 490-157783-1
Project/Site: BP #24163 - Winston-Salem, NC SDG: 381 Knollwood St, Winston-Salem, NC
Client Sample ID: MW-18 Lab Sample ID: 490-157783-3
Date Collected: 08/20/18 13:15 Matrix: Water
Date Received: 08/21/18 09:30
Method: 9056A - Anions, Ion Chromatography
Analyte Result Qualifier
Sulfate 173
RL MDL Unit D Prepared Analyzed Dil Fac
20.0 mg/L 08/22/1816:20 20
TestAmerica Nashville
Page 8 of 16 8/29/2018

Client Sample Results C
Client: ARCADIS U.S., Inc. TestAmerica Job ID: 490-157783-1
Project/Site: BP #24163 - Winston-Salem, NC SDG: 381 Knollwood St, Winston-Salem, NC
Client Sample ID: MW-19 Lab Sample ID: 490-157783-4
Date Collected: 08/20/18 12:45 Matrix: Water
Date Received: 08/21/18 09:30
Method: 9056A - Anions, Ion Chromatography
Analyte Result Qualifier
Sulfate 806
RL MDL Unit D Prepared Analyzed Dil Fac
200 mg/L 08/22/1816:56 200
TestAmerica Nashville
Page 9 of 16 8/29/2018

QC Sample Results
Client: ARCADIS U.S., Inc.
Project/Site: BP #24163 - Winston-Salem, NC
Method: 9056A - Anions, Ion Chromatography
Lab Sample ID: MB 490-537808/3
Matrix: Water
Analysis Batch: 537808
MB MB
Analyte Result Qualifier RL
Sulfate ND 1.00
Lab Sample ID: LCS 490-537808/4
Matrix: Water
Analysis Batch: 537808
TestAmerica Job ID: 490-157783-1
SDG: 381 Knollwood St, Winston-Salem, NC
Client Sample ID: Method Blank
Prep Type: Total/NA
MDL Unit D Prepared Analyzed Dil Fac
mg/L 08/22/18 10:22 1
Client Sample ID: Lab Control Sample 0
Prep Type: Total/NA F
Spike LCS LCS %Rec. —
Analyte Added Result Qualifier Unit D %Rec Limits
Sulfate 5.01 5.014 mg/L 100 80 -120
Lab Sample ID: LCSD 490-537808/5 Client Sample ID: Lab Control Sample Dup
Matrix: Water Prep Type: Total/NA
Analysis Batch: 537808
Spike LCSD LCSD %Rec. RPD
Analyte Added Result Qualifier Unit D %Rec Limits RPD Limit
Sulfate 5.01 5.025 mg/L 100 80-120 0 20
TestAmerica Nashville
Page 10 of 16 8/29/2018

QC Association Summary
Client: ARCADIS U.S., Inc.
Project/Site: BP #24163 - Winston-Salem, NC
HPLC/IC
Analysis Batch: 537808
Lab Sample ID
490-157783-1
490-157783-2
490-157783-3
490-157783-4
MB 490-537808/3
LCS 490-537808/4
LCSD 490-537808/5
Client Sample ID
MW-8R
MW-18
MW-19
Method Blank
Lab Control Sample
Lab Control Sample Dup
TestAmerica Job ID: 490-157783-1
SDG: 381 Knollwood St, Winston-Salem, NC
Prep Type
Matrix
Method
Total/NA
Water
9056A
Total/NA
Water
9056A
Total/NA
Water
9056A
Total/NA
Water
9056A
Total/NA
Water
9056A
Total/NA
Water
9056A
Total/NA
Water
9056A
Prep Batch
0
Page 11 of 16
TestAmerica Nashville
8/29/2018

Client: ARCADIS U.S., Inc.
Project/Site: BP #24163 - Winston-Salem, NC
Client Sample ID: MW-5R
Date Collected: 08/20/18 13:05
Date Received: 08/21/18 09:30
Lab Chronicle C
TestAmerica Job ID: 490-157783-1
SDG: 381 Knollwood St, Winston-Salem, NC
Batch Batch
Dil
Initial
Prep Type Type Method
Run Factor
Amount
Total/NA Analysis 9056A
20
Client Sample ID: MW-8R
Date Collected: 08/20/18 12:55
Date Received: 08/21/18 09:30
Batch Batch
Dil
Initial
Prep Type Type Method
Run Factor
Amount
Total/NA Analysis 9056A
100
Client Sample ID: MW-18
Date Collected: 08/20/18 13:15
Date Received: 08/21/18 09:30
Lab Sample ID: 490-157783-1
Matrix: Water
Final Batch Prepared
Amount Number or Analyzed Analyst Lab
537808 08/22/18 15:08 SW1 TAL NSH
Lab Sample ID: 490-157783-2
Matrix: Water
Final Batch Prepared
Amount Number or Analyzed Analyst Lab
537808 08/22/18 15:44 SW1 TAL NSH
Lab Sample ID: 490-157783-3
Matrix: Water
Batch
Batch
Dil Initial
Final Batch
Prepared
Prep Type Type
Method
Run Factor Amount
Amount Number
or Analyzed Analyst Lab
Total/NA Analysis
9056A
20
537808
08/22/18 16:20 SW1 TAL NSH
Client Sample ID: MW-19
Date Collected: 08/20/18 12:45
Date Received: 08/21/18 09:30
Lab Sample ID: 490-157783-4
Matrix: Water
Batch Batch Dil Initial Final Batch Prepared
Prep Type Type Method Run Factor Amount Amount Number or Analyzed Analyst Lab
Total/NA Analysis 9056A 200 537808 08/22/18 16:56 SW1 TAL NSH
Laboratory References:
TAL NSH = TestAmerica Nashville, 2960 Foster Creighton Drive, Nashville, TN 37204, TEL [phone]
Page 12 of 16
TestAmerica Nashville
8/29/2018

Method Summary
Client: ARCADIS U.S., Inc.
Project/Site: BP #24163 - Winston-Salem, NC
TestAmerica Job ID: 490-157783-1
SDG: 381 Knollwood St, Winston-Salem, NC
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 13 of 16 8/29/2018

Accreditation/Certification Summary C
Client: ARCADIS U.S., Inc. TestAmerica Job ID: 490-157783-1
Project/Site: BP #24163 - Winston-Salem, NC SDG: 381 Knollwood St, Winston-Salem, NC
Laboratory: TestAmerica Nashville
Unless otherwise noted, all analytes for this laboratory were covered under each accreditation/certification below.
Authority Program EPA Region Identification Number Expiration Date
North Carolina (WW/SW) State Program 4 387 12-31-18
The following analytes are included in this report, but are not accredited/certified under this accreditation/certification:
Analysis Method Prep Method Matrix Analyte
9056A Water Sulfate
TestAmerica Nashville
Page 14 of 16 8/29/2018

TestAmedca
THE LEADER IN ENVIRONMENTAL TESTING 490-157783 Chain of Custody
Nashville, TN COOLER RECEIPT FORM
Cooler Received/Opened On 812112018 @ 9:30
Time Samples Removed From Cooler Time Samples Placed In Storage 1 `
(2 Hour Window)
1. Tracking # (last 4 dtg't , FedEx) Courier: FedEx
IR Gun ID 97310166 pH Strip Lot Chlorine Strip Lot,
2. Temperature of rep. sample or temp blank when opened: Degrees Celsius
3. If Item #2 temperature is 0°C or less, was the representative sample or temp blank frozen?
YES NO.._
4. Were custody seals on outside of cooler?
/1 ES':�V0... NA
If yes, how many and where:
5. Were the seals intact, signed, and dated correctly?
O...NA
6. Were custody papers inside cooler?(_YES
O... NA
I certify that I opened the cooler and answered questions 1-6 (intial) _F9
7. Were custody seals on containers: YES j�0 and Intact
/`
YES ... NO.( AJ
\/
Were these signed and dated correctly?
YES...NO,/.IVA�
8. Packing mat'I used? ubblewrap Plastic bag Peanuts Vermiculite Foam Insert Paper Other None
9. Cooling process: itav) Ice -pack Ice (direct contact) Dry ice
Other None
10. Did all containers arrive in good condition (unbroken)?
Er ... 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?
li'EN_NO ... NA
13a. Were VOA vials received?
YES.. I.&( ...NA
b. Was there any observable headspace present in any VOA vial?
YES ... NO..6
® *
Larger than this.
14. Was there a Trip Blank in this cooler? YES..O...NA 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 correct pH level?
YES...NOd9
b. Did the bottle labels indicate that the correct preservatives were used
YO—NO... NA
16. Was residual chlorine present?
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)?
... NO ... NA
18. Did you sign the custody papers In the appropriate place?
...NO...NA
19, Were correct containers used for the analysis requested?
.f t,/�
/rE ... NO ... NA
20. Was sufficient amount of sample sent in each container?
�O...�O.,NNA
21. Were there Non -Conformance issues at login? YES..( 0� Was a NCM generated? YES. /.NO/..#.
BIS = Broken in shipment
Cooler Receipt Fonn.doc
LF-1
End of Form
Revised 8/23/17
Page 15 of 16
8/29/2018

00
N
Q0
N
O
TestAmerica Nashville
2960 Foster Creighton Drive
Nashville, TN 37204
Phone [phone] Fax (61M 796-34n4
Chain of Custody Record
,,S 1 mein ca
THE LEADER IN ENVIRONMENTAL TESTING.
Client Information
Sampler:it
I) t j �Q
Lab PM:
Cartier Tracking Nc(s):
COC No:
v� AJ P , !L ( o
Huckaba, Jennifer
490-71997-22130.1
Client Contact:
Paul Goodell
Phone:
i , , �I I
O j
E-Mail:
[e-mail]
Page: a
Page/of
Company:
Jab #:
ARCADIS U.S-, lnc.
Analysis Requested
Address:
801 Corporate Center Drive Suite 300
Due Date Requested: 1 1 ,{p!
S o-Y"
Preservation Codes:
A A - M -Hexane
- NaOHCL HCL N - None
City.
Raleigh
TAT Requested (days):
f (�.�
,
C -Zn Acetate 0-AsNa02
D - Nitric Acid P - Na204S
State, Zip:
NC,27607-5073
`
E-NaHSO4 0-Na2S03
F - McOH R - Na2S203
Phone:
PO #:
919-415-2299(Tel)
Purchase Order not required
a,
z'.'
G - Amchlor S - H2SO4
H- Ascorbic Acid T- TSPDodecahydrate
Ice U - Acetone
Email:
WO #:
[e-mail]
".
;�.�'`
J-DIWater V-MCAA
K- EDTA W - pH 4-5
Project Name:
Project#:
"}
BP #24163 - Winston-Salem, NC
49011104
�:^�
N
?
L-EDA Z- other (specity)or,
Other:
Site:
SSOW#:-
381 Knollwood St, Winston-Salem, NC
Sample
Matrix
Type
(wa Pr.
U.of
Sample
C=com
Sample Identification
Sample Date
Time
G= rab
aT=Tmu ,A=AIr
`LL
pfia,
Special Instructions/Note:
Pres�niahon Coale
-
f�f
f
^
s �'
�,0.
W_
7
49C
Loc:
C
157733
All
1'
,r
•^,'?bra,
Pos ble Hazard Identification
Sample Disposal (A fee may be assessed if samples are retained longer than 9 month)
Non -Hazard = Flammable Skin Irritant Poison B Unknown Radiological
Return To Client Disposal By Lab Archive For Months
Deliverable Requested: I, II, III, IV, Other (specify)
Special Instructions/QC Requirements:
Empty Kit Relinquished by: Date:
Time: Method of shipment:
Relinquishedby��
YV•� l
DateTme: tl,�y '�
C) r'2(j,%$ l�co
Company
rcoArS
eceive by)��P f /
� �71��tJT�� ��QC�
Date//rme: C' r y j"{��
c�S,3L1)S /Vct'
Cgompa/IyI-
d�'aly
Relinquished by
Date/Time =
Company
Received by
Date i n
l
ii
Company
Relinquished by
DateTme:
Company
Received by
a eTme:
Complany
Custody Seals Intact:
Custody Seal No.:
Cooler Temperature(s) °C antl Other Remarks:
M
A Yes A No

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:
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
5/13/2003
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
1.11
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
//201
22.
296
9/1919/2016
--
--
_
--
21.3
--
3/23/2006
11,700
2,440
32,000
13,500
16,100
3/23/2006 ('I
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)
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
1,150J
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
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
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-SR
9/19/2016
--
--
--
--
--
2,880
--
3/3/2017
3,570
9/20/2017
1,060
3/1 /2018
163
8/20/2018
147
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
1.11
< 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
t�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
E'7,760
2,440
31,900
13,800
4,560
2,410
635
2/26/2013
M 7,310
2,480
3Q500
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
6/2/2014 ('�
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
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
<0.42U
<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:
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
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
0.92
417 J
_
< 0.1
5/13/2003
57.7
_25
< 6.5
< 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
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
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
6/15/2012 (2)
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
MW-19 11/7/2013
2,020
984
9,850
5,620
2,260
2,890
255
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
AMMI a
ann
Notes:
l'l Field duplicate
IZIAlkalinity, 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
OBold 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