WI0400198_Monitoring (Report)_20161214

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ARCADIS Design sr Consultancy
fornaturaland
built assets
Mr. Michael Rogers
UIC Program Manager
NCDEQ — DWR
1636 Mail Service Center
Raleigh, North Carolina 27699
Subject:
Groundwater Monitoring Report — 2016
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 Groundwater Monitoring Report — 2016 dated December 3, 2016 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
Tel [phone]
Fax [phone]
www.arcadis.com
A019INel21tIIA011
Date:
January 4, 2017
Contact:
Paul Goodell
Phone:
919.415.2327
Email:
[e-mail]
Our ref:
GP16BPNA.NC10
Page:
1/1

/aRCADIS design&Consultancy
fornaturaland
built assets
Atlantic Richfield Company
c/o BP Products North America, Inc.
2ND SEMI-ANNUAL MONITORING
REPORT - 2016
'A
Former BP Facility #24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
NCDEQ Incident #6400 (Closed)
Injection Permit #W10400198
'A

2nd Semi -Annual Monitoring Report - 2016
2ND SEMI-ANNUAL
MONIORING REPORT
REPORT - 2016
Prepared for:
1
Atlantic Richfield Company
c/o BP Products North America, Inc.
Alexandra M. Simpson
Mr. Greg Frisch — Project Manager
AFS Task Leader 3
4850 E. 4911 Street
MBC-3 Room 155C
Cuyahoga Heights, Ohio 44125
Tel [phone]
Paul Goodell, E.I.
Prepared by:
AFS Project Manager 5
Arcadis G&M of North Carolina, Inc.
801 Corporate Center Drive
�tIQffiIrr��n
Suite 300
Raleigh, North Carolina 27607
(
C. Scott Boitian, P.E. 3 G
Tel [phone]
North Carolina P.E. No, 25659
Fax [phone]
Senior EngineelE,`"ao � .a.:
�d4j�r:Y �
www.arcadis-us com
�i • o4 .
z %'��y°"nan�wngaan
Environmental
Our Ref.:
GPI6BPNA.NC10
Date:
December 3, 2016
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.
SrC8di5 Gor1i I

2no Semi -Annual Monitoring Report - 2016
2na Semi -Annual Monitoring Report
Former BP Facility #24163
381 Knollwood St
Winston-Salem, Forsyth County, North Carolina
Latitude 361,5' 25.94"N Longitude 800 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:
is
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
c/o BP Products North America,
Inc.
Attn: Greg Frisch
4850 East 49°h Street
MSC-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
1, (_ _ /� (�/ I C/'1_�, a Professional Engineer for ARCADIS G&M of North
Carolina, Inc., do certify that the information c ntained in this report is correct and accurate to the best of
my knowledge. ARCADIS G&M of NorthColina, Inc. is licensed to practice geology and engineering in
North Carolina. The certification•nun�ber.T.&the company are C-155 (geology) and C-1869 (engineering).

2nd Semi -Annual Monitoring Report - 2016
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.
Well Construction Details
Table 2.
Groundwater Elevation Data
Table 3.
Groundwater Quality Field Parameters
Table 4.
Groundwater Analytical Data
FIGUREc'
Figure 1. Site Location Map
Figure 2. Site Map
Figure 3. Potentiometric Surface Map - September 2016
Figure 4. Groundwater Analytical Data Map
Figure 5. Sulfate Isoconcentration Map September 19, 2016
APPENDICES
A- Historical Groundwater Elevation Data
B- Laboratory Analytical Report and Chain -of -Custody Record — September 19, 2016
C- Historical Groundwater Analytical Data
3
4
4
4
5
5
6
7
arcadis.com

2nd Semi -Annual Monitoring Report - 2016
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 monitoring wells associated with Former BP Facility #24163
located at 381 Knollwood Street, in Winston-Salem, Forsyth County, North Carolina (the Site) on
September 19, 2016. 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 September 19, 2016, Arcadis completed a semi-annual groundwater monitoring and sampling
event at the Site. Five (5) groundwater monitoring wells (MW-3, MW-5R, MW-8R, MW-18, and
MW-19) were gauged to determine the depth to water (DTW) and depth to product (DTP), if
present. DTW ranged from 13.75 feet below top of casing (btoc) in groundwater monitoring well
MW-19 to 14.04 feet btoc in groundwater monitoring well MW-18. Free product was not detected
at the Site on September 19, 2016.
On September 19, 2016, groundwater samples were collected from groundwater monitoring wells
MW-3, MW-5R, MW-8R, MW-18, and MW-19. The maximum concentrations of selected
dissolved -phase COCs found during the September 19, 2016 sampling events are summarized in
the table below:
Maximum Groundwater Concentrations (September 19, 2016)
Chemical of
Monitoring Well
Concentration
North Carolina
Concern
ID
(mg/L)
Groundwater
(COC)
Quality (2L)
Standards
Sulfate
MW-5R
2,880
250
Note: Concentration in Bold exceed the applicable North Carolina GCL Standard
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-5R, MW-8R, MW-18, and MW-19.
Arcadis recommends discontinuing semi-annual sampling of groundwater monitoring well MW-3.
Groundwater monitoring well MW-3 has not had a historical dissolved -phase sulfate detection
above the applicable North Carolina 2L Standards since groundwater sampling was initiated at
the Site.
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 2017. Groundwater monitoring wells MW-
5R, MW-8R, MW-18, and MW-19 will be gauged to evaluate the potentiometric surface at the
Site. Groundwater samples will be collected from MW-5R, MW-8R, MW 18, and MW-19 for
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2nd Semi -Annual Monitoring Report - 2016
analysis of sulfate by Standard Method 9056A. A Semi -Annual Groundwater Monitoring Report
documenting the proposed activities for 2017 will be submitted to the NCDEQ for review and
approval within 45-days of receipt of the laboratory analytical report.
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2nd Semi -Annual Monitoring Report - 2016
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 northwest 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). No Further Action (NFA) status was granted for the
subject incident number 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
dissolved -phase sulfate concentrations are no longer detected above the North Carolina Groundwater
Quality (2L) Standards.
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2nd Semi -Annual Monitoring Report - 2016
2.0 GROUNDWATER MONITORING
2.1 Groundwater Gauging
On September 19, 2016, Arcadis G&M of North Carolina, Inc. (Arcadis) personnel gauged
monitoring wells MW-3, MW-5R, MW-8R, MW-18, and MW-19. Gauging was conducted with an
oil/water interface probe (IP) prior to purging and sampling to determine DTB, DTW, and DTP, if
present. The I 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.
Free product was not detected during the September 19, 2016 groundwater monitoring event.
Depth to water ranged from 13.75 btoc in groundwater monitoring well MW-19 to 14.04 feet btoc
in groundwater monitoring well MW-18.
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 Ground water Sampli ng
On September 19, 2016, groundwater monitoring wells MW-3, 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 representative of the water in the aquifer, a
minimum of three well volumes were removed. Using a YSI-556, field parameters for pH, ORP,
Temperature, Dissolved Oxygen, and Specific Conductance were collected for each well after
purging. This data can be found in Table 3.
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 September 19, 2016
groundwater sampling event is included as Appendix B.
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2nd Semi -Annual Monitoring Report - 2016
2.3 Groundwater Analytical Results
Groundwater analytical data from the September 19, 2016 groundwater sampling event indicated
the following:
• Dissolved -phase concentrations of sulfate were detected in concentrations exceeding the
applicable North Carolina 2L Standard of 250 milligrams per liter (mg/L) in groundwater
monitoring wells MW-5R (2,880 mg/L), MW-8R (1,330 mg/L), MW-18 (377 mg/L), and
MW-19 (1,270 mg/ L).
Current groundwater analytical results are presented in Table 4. Historical analytical groundwater
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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2nd Semi -Annual Monitoring Report - 2016
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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2nd Semi -Annual Monitoring Report - 2016
4.0 CONCLUSIONS AND RECOMMENDATIONS
Free Product was not observed at the Site during the September 19, 2016 groundwater
monitoring and sampling event. Dissolved -phase sulfate was detected above the applicable 2L
groundwater quality standard in groundwater monitoring wells MW-5R, MW-8R, MW-18, and
MW-19, exceeding the applicable North Carolina 2L standard of 250 mg/L.
Arcadis recommends discontinuing semi-annual sampling of groundwater monitoring well MW-3.
Groundwater monitoring well MW-3 has not had a historical dissolved -phase sulfate detection
above the applicable North Carolina 2L Standards since groundwater sampling was initiated at
the Site.
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 2017. Groundwater monitoring wells MW-
5R, MW-8R, MW-18, and MW-19 will be gauged to evaluate the potentiometric surface at the
Site. Groundwater samples will be collected from MW-5R, MW-8R, MW18, and MW-19 for
analysis of sulfate by Standard Method 9056A. A Semi -Annual Groundwater Monitoring Report
documenting the proposed activities for 2017 will be submitted to the NCDEQ for review and
approval within 45-days of receipt of the laboratory analytical report.
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2nd Semi -Annual Monitoring Report - 2016
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
Well
Status
Well
Type
TOC
Elevation (2)
Total
Depth ���
Well
Diameter (inches)
Screen
Interval (1)
Avg Screen
Elevation (2)
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
well
Date
Measured
TOC
Elevation
Depath to
LNAPL
Depth to
Groundwater
(btoc)
LNAPL
Thickness
Corrected
Groudwater
Elevation
MW-3
9/19/2016
99.03
ND
13.92
0.00
85.1
MW-5R
9/19/2016
NM
ND
13.99
0.00
NM
MW-8R
9/19/2016
NM
ND
13.91
0.00
NM
MW-18
9/19/2016
NM
ND
14.04
0.00
NM
MW-19
9/19/2016
NM
ND
13.75
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
Groundwater Field Parameter Data, September 2016
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
Well
Date
DTW
pH
(s.u.)
ORP
(mV)
Temperature
(0C)
Specific
Conductance
(MS/CM)
DO
(mg/L)
MW-3
9/19/2016
13.92
6.76
71
24.33
0.884
0.00
MW-5R
9/19/2016
13.99
8.77
-99
23.21
9.04
0.00
MW-8R
9/19/2016
13.91
6.68
12
22.19
4.27
0.00
MW-18
9/19/2016
14.04
7.18
-65
22.91
2.65
12.16
MW-19
9/19/2016
13.75
1 6.13
86
22.60
3.67
0.00
Notes•
ORP - oxidation-reduction potential
DO - dissolved oxygen
s.u. - standard units
mV - millivolts
°C - degrees Celsius
mS/cm - milliSiemens per centimeter
mg/L - milligrams per liter
Page 1 of 1

Table 4
Summary of Groundwater Results, September 2016
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, NC
Sample ID
MW-3
MW-5R
MW-8R
MW-18
MW-19
Date Sampled
9/19/2016
9/19/2016
9/19/2016
9/19/2016
9/19/2016
Units
mg/L
mg/L
mg/L
mg/L
mg/L
Sulfate
21.3
2880
1330
377
1270
Notes
mg/L - milligrams per liter
BOLD text indicates NC groundwater standard 2L exceendance of 250 mg/L
Page 1 of 1

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GROUNDWATER MONITORING WELL
NOTES:
1. MONITORING WELL LOCATIONS ARE APPROXIMATE
2. THE SITE IS A VACANT PARKING LOT. ALL SITE FEATURES EXCEPT
PARKING LOT CURBS AND ROADWAYS REPRESENT FORMER SITE
CHARACTERISTICS.
D 30' IiC
GRAPHIC SCALE
I CEO SP PRODUCT$ NORTH AMERICA, INC,
FORMER BP STATION 24163
381 KNOLLWOOO ST., WINSTON-SALEM, NORTH CRROLINA
SITE MAP
FIGUgE
fh ARCADIS
2

0
a
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LEGEND:
— — — PROPERTY LINE
ABANDONED GROU NOWATER MON ITORI NG WELL
FORMER PRODUCT LINE
OCR CATCH BASIN
O MR. MAN HOLE
w{ AREA LIGHT
0 �P. LmLTTY POLE
Fkl FIRE HYDRANT
-TELEPHONE
C LARGE MANHOLE COVER
GROUNDWATER MONITORING WELL
{B,R.11 j GROUNDWATER ELEVATION [FT AMSLj
- HISTORICAL DEPICTED GROUNDWATER FLAW (FT AMSL) DIRECTION
FT AMSL FEET ABOVE MEAN SEA LEVEL
(NM) NOT MEASURED
O 3W BP
GRAPHIC SCALE

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N
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W
H
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J
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Y
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I
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FORMER 1 1
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LEGEND:
- --
PROPERTYLINE
1
ABANDONED GROUNDWATER MONRORING WELL
FORMER PRODUCT LINE
CATCH BASIN
❑ µN
MAN HOLE
F►
AREA LIGHT
UTILITY POLE
F"
FIRE HYDRANT
TELEPHONE
LARGE MANHOLE COVER
GROUNDWATER MONITORING WELL
mwkL
MILIGRAMS PER LITER
LEGEND
Abbreviation
I Constituent
2L
504
I Sulfate
250
HATE:
1. THE NORTH CAROLINA 2L STANDARD FOR SULFATE IS 250 mot
2. BOLDED VALUES EXCEED NORTH CAROUNA 2L STANDARDS.
6 3W BP
GRAPHIC SCALE

low-+6
FGRASS w
M
pIAF ", .-F..
,y i •t7 1�
�
ASP ALT TRH
AARPOW EHCLr3WRE
8 HED '
SHED
f ' Meru SHED '
FORMER (A -SOIL W
AREA
{ ± FORMER 1
1 9P SERVICE '
� STAIILIN
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mW-$
2.080)
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- awcPr
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ER4OL
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T
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CANDPY
I
FORMER
ETRI
VENC RISERS
-
IN W-"
..
FORMER
VENTRISERS
LEGEND:
— - —
PROPERTYLINE
ABANDON ED GROUNDWATER MONITORING WELL
FORMER PRODUCT LINE
OCB.
CATCH BASIN
Q MN
MAN HOLE
W*
AREA LIGHT
■ LP
UTILITY POLE
4b "'
FIRE HYDRANT
TELEPHONE
LARGE MANHOLE COVER
GROUNDWATER MONITORING WELL
[2,880y
SULFATE CONCENTRATION ¢ngny
ESTIMATED BENZENE CONCENTRATION CONTOUR 2L
STANDARD (MWL)
R1g1I
MILLIGRAMS PER LITER
NOTES:
1. THE NORTH CAROL INA X STANDARD POR SULFATE IS 754 nVL
0 3Y nC
GRAPHIC SCALE

M � � A,��I/A-A,
Historical Groundwater Elevation Data

Appendix A
Historical Groundwater Elevation Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
TOC
Depth to
Depth to
LNAPL
Corrected
Wen
Date
Elevation
LNAPL
Groundwater
Thickness
Groundwater
-1
(feet bloc)
(feet bloc)
(feet)
Elevation (1)(2)
*
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
MW-3
10/31/11
99.03
ND
13.87
0.00
85.16
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
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
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
NM-5R
05/31/13
NS
ND
13.77
0.00
NM
08/28/13
ND
13.83
0.00
NM
11/07/13
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
Page 1 of 5

Appendix A
Historical Groundwater Elevation Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
TOC
Depth to
Depth to
LNAPL
Corrected
Well
Date
Elevation
LNAPL
Groundwater
Thickness
Groundwater
-1
(feet btoc)
(feet bloc)
(feet)
Elevation (1)(2)
*
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
MW 6
03/05/02
98.68
ND
11.02
0.00
87.66
05/12/03
ND
11.10
0.00
87.58
12/09/03
ND
13.49
0.00
85.19
03/23/06
ND
11.79
0.00
86.89
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/O1
ND
18.07
0.00
81.19
09/12/O1
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
*
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
MW 8
*
12/27/O1
97.84
14.47
15.03
0.56
83.26
*
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
Page 2 of 5

Appendix A
Historical Groundwater Elevation Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
TOC
Depth to
Depth to
LNAPL
Corrected
Well
Date
Elevation
LNAPL
Groundwater
Thickness
Groundwater
-1
(feet btoc)
(feet bloc)
(feet)
Elevation (1)(2)
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
MW-8R
05/31/13
NS
ND
13.61
0.00
NM
08/28/13
ND
13.74
0.00
NM
11/07/13
ND
14.42
0.00
NM
02/27/14
ND
13.33
0.00
NM
06/02/14
ND
13.34
0.00
NM
10/16/14
ND
14.18
0.00
NM
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
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/O1
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
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/O1
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
MW-15
05/12/03
99.91
NM
12.75
NM
87.16
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
Page 3 of 5

Appendix A
Historical Groundwater Elevation Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
TOC
Depth to
Depth to
LNAPL
Corrected
Well
Date
Elevation
LNAPL
Groundwater
Thickness
Groundwater
-1
(feet btoc)
(feet bloc)
(feet)
Elevation (1)(2)
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/O1
ND
15.37
0.00
84.63
03/05/02
ND
15.15
0.00
84.85
MW-17
05/12/03
100.00
NM
14.15
NM
85.85
12/09/03
ND
14.50
0.00
85.50
03/23/06
ND
14.45
0.00
85.55
05/08/07
ND
14.22
0.00
85.78
05/14/08
ND
14.22
0.00
85.78
05/28/09
ND
14.12
0.00
85.88
05/27/10
ND
13.90
0.00
86.10
10/31/11
ND
14.72
0.00
85.28
06/02/14
ND
14.14
0.00
85.86
04/28/16
ND
14.36
0.00
85.64
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
MW-18
05/31/13
NS
ND
14.57
0.00
NM
08/28/13
ND
14.33
0.00
NM
11/07/13
ND
14.51
0.00
NM
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
Page 4 of 5

Appendix A
Historical Groundwater Elevation Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
Well
Date
TOC
Elevation
-1
Depth to
LNAPL
(feet btoc)
Depth to
Groundwater
(
LNAPL
Thickness
(feet)
Corrected
Groundwater
Elevation (1)(2)
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
MW-19
NS
08/28/13
ND
13.56
0.00
NM
11/07/13
ND
14.25
0.00
NM
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
Notes:
1. Measured in feet relative to site datum
2. Con. GW Elev. = (ref point elevation) - (depth to groundwater) + (LNAPL thiclmess)(LNAPL specific gravity)
3. LNAPL specific gravity assumed to be 0.73
» Monitoring well MW-3 was previously reported as MW-2, monitoring well MW-6 was previously reported as MW-8, and monitoring well MW-8 was
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

Laboratory Analytical Report and Chain -of -Custody Record —
September 19, 2016

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: 490-112156-1
TestAmerica SDG: 381 Knollwood St, Winston-Salem, NC
Client Project/Site: Former BP Facility #24163
ror:
ARCADIS U.S., Inc.
801 Corporate Center Drive
Suite 300
Raleigh, North Carolina 27607-5073
Attn: Paul Goodell
ie*'_�
Authorized for release by.
101512016 10:01:56 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.
Project/Site: Former BP Facility #24163
TestAmerica Job ID: 490-112156-1
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 ........................................
11
QC Association ...........................................
13
Chronicle................................................
14
Method Summary .........................................
15
Certification Summary ......................................
16
Chain of Custody ..........................................
17
Receipt Checklists .........................................
19
TestAmerica Nashville
Page 2 of 19 10/5/2016

Sample Summary
Client: ARCADIS U.S., Inc.
TestAmerica Job ID: 490-112156-1
Project/Site: Former BP Facility #24163
SDG:
381 Knollwood St, Winston-Salem, NC
Lab Sample ID
Client Sample ID
Matrix
Collected Received
490-112156-1
MW-5R
Ground Water
09/19/16 14:05 09/21/16 09:45
490-112156-2
MW-8R
Ground Water
09/19/16 14:30 09/21/16 09:45
490-112156-3
MW-18
Ground Water
09/19/16 13:15 09/21/16 09:45
490-112156-4
MW-19
Ground Water
09/19/16 15:10 09/21/16 09:45
490-112156-5
MW-3
Ground Water
09/19/16 15:40 09/21/16 09:45
TestAmerica Nashville
Page 3 of 19 10/5/2016

Case Narrative C
Client: ARCADIS U.S., Inc. TestAmerica Job ID: 490-112156-1
Project/Site: Former BP Facility #24163 SDG: 381 Knollwood St, Winston-Salem, NC
Job ID: 490-112156-1
Laboratory: TestAmerica Nashville
Narrative
Job Narrative
490-112156-1
Comments
Sulfate method was switched to 9056A to match the matrix. The Carbon Dioxide and Alkalinity were cancelled per client request.
Receipt
The samples were received on 9/21/2016 9:45 AM; the samples arrived in good condition, properly preserved and, where required, on ice
The temperature of the cooler at receipt was 3.91 C.
HPLC/IC
Method(s) 9056, 9056A: The matrix spike / matrix spike duplicate (MS/MSD) recoveries for analytical batch 490-373905 were outside
control limits. Sample matrix interference and/or non -homogeneity are suspected because the associated laboratory control sample /
laboratory control sample duplicate (LCS/LCSD) recoveries were within the acceptance limits.
Method(s) 9056A: The following samples were diluted due to the nature of the sample matrix: MW-5R (490-112156-1), MW-8R
(490-112156-2), MW-18 (490-112156-3) and MW-19 (490-112156-4). Elevated reporting limits (RLs) are provided.
No additional analytical or quality issues were noted, other than those described above or in the Definitions/Glossary page. C
TestAmerica Nashville
Page 4 of 19 10/5/2016

Client: ARCADIS U.S., Inc.
Project/Site: Former BP Facility #24163
Qualifiers
:I;JIlMC«
Definitions/Glossary C
TestAmerica Job ID: 490-112156-1
SDG: 381 Knollwood St, Winston-Salem, NC
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.
n 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, RA, RE, IN Indicates a Dilution, Re -analysis, Re -extraction, or additional Initial metals/anion analysis of the sample
DLC Decision level concentration
MDA Minimum detectable activity
EDL Estimated Detection Limit
MDC Minimum detectable concentration
MDL Method Detection Limit
MIL 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
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 19 10/5/2016

Client: ARCADIS U.S., Inc.
Project/Site: Former BP Facility #24163
Client Sample ID: MW-5R
Date Collected: 09/19/16 14:05
Date Received: 09/21/16 09:45
Client Sample Results C
TestAmerica Job ID: 490-112156-1
SDG: 381 Knollwood St, Winston-Salem, NC
Method: 9056A - Anions, Ion Chromatography
Analyte Result Qualifier
Sulfate 2880
Lab Sample ID: 490-112156-1
Matrix: Ground Water
RL MDL Unit D Prepared Analyzed Dil Fac
100 mg/L 09/29/16 21:38 100
TestAmerica Nashville
Page 6 of 19 10/5/2016

Client: ARCADIS U.S., Inc.
Project/Site: Former BP Facility #24163
Client Sample Results C
TestAmerica Job ID: 490-112156-1
SDG: 381 Knollwood St, Winston-Salem, NC
Client Sample ID: MW-8R Lab Sample ID: 490-112156-2
Date Collected: 09/19/16 14:30 Matrix: Ground Water
Date Received: 09/21/16 09:45
Method: 9056A - Anions, Ion Chromatography
Analyte Result Qualifier
Sulfate 1330
RL MDL Unit D Prepared Analyzed Dil Fac
100 mg/L 09/29/16 21:49 100
TestAmerica Nashville
Page 7 of 19 10/5/2016

Client: ARCADIS U.S., Inc.
Project/Site: Former BP Facility #24163
Client Sample ID: MW-18
Date Collected: 09/19/16 13:15
Date Received: 09/21/16 09:45
Client Sample Results C
TestAmerica Job ID: 490-112156-1
SDG: 381 Knollwood St, Winston-Salem, NC
Method: 9056A - Anions, Ion Chromatography
Analyte Result Qualifier
Sulfate 377
Lab Sample ID: 490-112156-3
Matrix: Ground Water
RL MDL Unit D Prepared Analyzed Dil Fac
100 mg/L 09/29/16 22:00 100
TestAmerica Nashville
Page 8 of 19 10/5/2016

Client: ARCADIS U.S., Inc.
Project/Site: Former BP Facility #24163
Client Sample ID: MW-19
Date Collected: 09/19/16 15:10
Date Received: 09/21/16 09:45
Client Sample Results C
TestAmerica Job ID: 490-112156-1
SDG: 381 Knollwood St, Winston-Salem, NC
Method: 9056A - Anions, Ion Chromatography
Analyte Result Qualifier
Sulfate 1270
Lab Sample ID: 490-112156-4
Matrix: Ground Water
RL MDL Unit D Prepared Analyzed Dil Fac
100 mg/L 09/29/16 22:12 100
TestAmerica Nashville
Page 9 of 19 10/5/2016

Client: ARCADIS U.S., Inc.
Project/Site: Former BP Facility #24163
Client Sample ID: MW-3
Date Collected: 09/19/16 15:40
Date Received: 09/21/16 09:45
Client Sample Results C
TestAmerica Job ID: 490-112156-1
SDG: 381 Knollwood St, Winston-Salem, NC
Method: 9056A - Anions, Ion Chromatography
Analyte Result Qualifier
Sulfate 21.3
Lab Sample ID: 490-112156-5
Matrix: Ground Water
RL MDL Unit D Prepared Analyzed Dil Fac
1.00 mg/L 09/28/1618:12 1
TestAmerica Nashville
Page 10 of 19 10/5/2016

Client: ARCADIS U.S., Inc.
Project/Site: Former BP Facility #24163
QC Sample Results C
TestAmerica Job ID: 490-112156-1
SDG: 381 Knollwood St, Winston-Salem, NC
Method: 9056A - Anions, Ion Chromatography
Lab Sample ID: MB 490-373905/3
Matrix: Water
Analysis Batch: 373905
MB MB
Analyte
Result Qualifier
Sulfate
ND
Lab Sample ID: LCS 490-373905/4
Matrix: Water
Analysis Batch: 373905
Analyte
Sulfate
Lab Sample ID: LCSD 490-373905/5
Matrix: Water
Analysis Batch: 373905
Analyte
Sulfate
Lab Sample ID: 490-112156-1 MS
Matrix: Ground Water
Analysis Batch: 373905
Sample Sample
Analyte
Result Qualifier
Sulfate
1740 E
Lab Sample ID: 490-112156-1 MSD
Matrix: Ground Water
Analysis Batch: 373905
Sample Sample
Analyte
Result Qualifier
Sulfate
1740 E
Lab Sample ID: MB 490-374278/3
Matrix: Water
Analysis Batch: 374278
MB MB
Analyte
Result Qualifier
Sulfate
ND
Lab Sample ID: LCS 490-374278/4
Matrix: Water
Analysis Batch: 374278
Analyte
Sulfate
Client Sample ID: Method Blank
Prep Type: Total/NA
L
RL
MDL Unit
D Prepared Analyzed Dil Fac
1.06
mg/L
09/28/1616:32 1
Client Sample ID: Lab Control Sample
Prep Type: Total/NA
Spike
LCS
LCS
%Rec.
Added
Result
Qualifier
Unit
D %Rec Limits
10.0
9.425
mg/L
94 80 - 120
Client Sample ID: Lab Control Sample Dup
Prep Type: Total/NA
Spike
LCSD
LCSD
%Rec. RPD
Added
Result
Qualifier
Unit
D %Rec Limits RPD Limit
10.0
9.413
mg/L
94 80 - 120 0 20
Client Sample ID: MW-5R
Prep Type: Total/NA
Spike
MS
MS
%Rec.
Added
Result
Qualifier
Unit
D %Rec Limits
2.00
1453
E 4
mg/L
-1453 80 - 120
7
Client Sample ID: MW-5R
Prep Type: Total/NA
Spike MSD MSD %Rec. RPD
Added Result Qualifier Unit D %Rec Limits RPD Limit
2.00 1452 E 4 mg/L -1457 80 - 120 0 20
4
Client Sample ID: Method Blank
Prep Type: Total/NA
RL MDL Unit D Prepared Analyzed Dil Fac
1.00 mg/L 09/29/1619:36 1
Client Sample ID: Lab Control Sample
Prep Type: Total/NA
Spike LCS LCS %Rec.
Added Result Qualifier Unit D %Rec Limits
10.0 9.861 mg/L 99 80 - 120
Page 11 of 19
TestAmerica Nashville
10/5/2016

QC Sample Results
Client: ARCADIS U.S., Inc.
TestAmerica Job ID: 490-112156-1
Project/Site: Former BP Facility #24163
SDG: 381 Knollwood St, Winston-Salem, NC
Method: 9056A - Anions, Ion Chromatography (Continued)
Lab Sample ID: LCSD 490-37427815
Client Sample ID: Lab Control Sample Dup
Matrix: Water
Prep Type: Total/NA
Analysis Batch: 374278
Spike
LCSD
LCSD
%Rec. RPD
Analyte
Added
Result
Qualifier
Unit D %Rec Limits RPD Limit
Sulfate
10.0
9.892
mg/L 99 80.120 0 20
Lab Sample ID: 490-112667-G-2 MS
Client Sample ID: Matrix Spike
Matrix: Water
Prep Type: Total/NA
Analysis Batch: 374278
Sample
Sample
Spike
MS
MS
%Rec.
Analyte Result
Qualifier
Added
Result
Qualifier
Unit D %Rec Limits
Sulfate 1890
E
2.00
1574
E 4
—
mg/L - 5585 80 - 120
1
Lab Sample ID: 490-112667-G-2 MSD
Client Sample ID: Matrix Spike Duplicate
Matrix: Water
Prep Type: Total/NA
Analysis Batch: 374278
Sample
Sample
Spike
MSD
MSD
%Rec. RPD
Analyte Result
Qualifier
Added
Result
Qualifier
Unit D %Rec Limits RPD Limit
Sulfate 1890
E
2.00
1561
E 4
mg/L -1648 80.120 1 20
9
TestAmerica Nashville
Page 12 of 19 10/5/2016

QC Association Summary
Client: ARCADIS U.S., Inc.
Project/Site: Former BP Facility #24163
TestAmerica Job ID: 490-112156-1
SDG: 381 Knollwood St, Winston-Salem, NC
HPLUC
Analysis Batch: 373905
Lab Sample ID
Client Sample ID
Prep Type
Matrix
Method Prep Batch
490-112156-5
MW-3
Total/NA
Ground Water
9056A
MB 490-373905/3
Method Blank
Total/NA
Water
9056A
LCS 490-373905/4
Lab Control Sample
Total/NA
Water
9056A
LCSD 490-373905/5
Lab Control Sample Dup
Total/NA
Water
9056A
490-112156-1 MS
MW-5R
Total/NA
Ground Water
9056A
490-112156-1 MSD
MW-5R
Total/NA
Ground Water
9056A
Analysis Batch: 374278
Lab Sample ID
Client Sample ID
Prep Type
Matrix
Method Prep Batch
490-112156-1
MW-5R
Total/NA
Ground Water
9056A
490-112156-2
MW-8R
Total/NA
Ground Water
9056A
490-112156-3
MW-18
Total/NA
Ground Water
9056A
490-112156-4
MW-19
Total/NA
Ground Water
9056A
MB 490-374278/3
Method Blank
Total/NA
Water
9056A
LCS 490-374278/4
Lab Control Sample
Total/NA
Water
9056A
LCSD 490-374278/5
Lab Control Sample Dup
Total/NA
Water
9056A
490-112667-G-2 MS
Matrix Spike
Total/NA
Water
9056A
490-112667-G-2 MSD
Matrix Spike Duplicate
Total/NA
Water
9056A
Page 13 of 19
TestAmerica Nashville
10/5/2016

Client: ARCADIS U.S., Inc.
Project/Site: Former BP Facility #24163
Client Sample ID: MW-5R
Date Collected: 09/19/16 14:05
Date Received: 09/21/16 09:45
Batch
Batch
Prep Type Type
Method
Total/NA Analysis
9056A
Client Sample ID: MW-8R
Date Collected: 09/19/16 14:30
Date Received: 09/21/16 09:45
Batch
Batch
Prep Type Type
Method
Total/NA Analysis
9056A
Client Sample ID: MW-18
Date Collected: 09/19/16 13:15
Date Received: 09/21/16 09:45
Lab Chronicle C
TestAmerica Job ID: 490-112156-1
SDG: 381 Knollwood St, Winston-Salem, NC
Lab Sample ID: 490-112156-1
Matrix: Ground Water
Dil Initial Final Batch Prepared
Run Factor Amount Amount Number or Analyzed Analyst Lab
100 374278 09/29/16 21:38 NC TAL NSH
Lab Sample ID: 490-112156-2
Matrix: Ground Water
Dil Initial Final Batch Prepared
Run Factor Amount Amount Number or Analyzed Analyst Lab
100 374278 09/29/16 21:49 NC TAL NSH
Lab Sample ID: 490-112156-3
Matrix: Ground Water
Prep Type
Batch
Type
Batch
Method
Dil Initial
Run Factor Amount
Total/NA
Analysis
9056A
100
Client Sample ID: MW-19
Date Collected: 09/19/16 15:10
Date Received: 09/21/16 09:45
Batch
Prep Type Type
Batch
Method
Total/NA Analysis
9056A
Final Batch Prepared
Amount Number or Analyzed Analyst Lab
374278 09/29/16 22:00 NC TAL NSH
Lab Sample ID: 490-112156-4
Matrix: Ground Water
Dil Initial Final Batch Prepared
Run Factor Amount Amount Number or Analyzed Analyst Lab
100 374278 09/29/16 22:12 NC TAL NSH
Client Sample ID: MW-3 Lab Sample ID: 490-112156-5
Date Collected: 09/19/16 15:40 Matrix: Ground Water
Date Received: 09/21/16 09:45
F Batch Batch Dil Initial Final Batch Prepared
Prep Type Type Method Run Factor Amount Amount Number or Analyzed Analyst Lab
Total/NA Analysis 9056A 1 373905 09/28/16 18:12 LDC TAL NSH
Laboratory References:
TAL NSH = TestAmerica Nashville, 2960 Foster Creighton Drive, Nashville, TN 37204, TEL [phone]
Page 14 of 19
TestAmerica Nashville
10/5/2016

Method Summary
Client: ARCADIS U.S., Inc.
Project/Site: Former BP Facility #24163
TestAmerica Job ID: 490-112156-1
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 15 of 19 10/5/2016

Certification Summary
Client: ARCADIS U.S., Inc.
Project/Site: Former BP Facility #24163
Laboratory: TestAmerica Nashville
The certifications listed below are applicable to this report.
TestAmerica Job ID: 490-112156-1
SDG: 381 Knollwood St, Winston-Salem, NC
F_
Authority Program EPA Region Certification ID Expiration Date
North Carolina (WW/SW) State Program 4 387 12-31-16
TestAmerica Nashville
Page 16 of 19 10/5/2016

TestAmeriaa
490_112156 Chain otCustody ium,,ur
THE Lf_IDER 114 ENVIROWAENTAL TESTING ---"-'�-- -- --.- _
Nashville, TN COOLER RECEIPT FORIM
Cooler Received/Opened On 912112015 a 0945
Time Samples Removed Fi, ooler 10 Time Samples Placed In Storage 145 (2 Hour Window)
Y
1. Tracking # LJ (last 4 digits, FedEx) Courier: _Fed Ex_
]R Gun I❑ 17960357 pH Strip Lot HC551117 Chlorine Strip Lot 040715C
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.t4
4. Were custody seals on outside of cooler? NO.
If yes, how man and where: I —
5. Were the seals intact, signed, and dated correctly? NO...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 and Intact YES.,.NO.,&
Were these signed and dated correctly? YES...No-.-o
8. Packing mat'] used? Bubdlewrap Plastic bag Peanuts Vermiculite Foam Insert Paper Other one
9. Goofing process: Ice Ice -pack ra {direct canto } Dry ice Other None
10. Did all containers arrive in good condition {unbroken}? tS..NO_.NA
11. Were all container labels complete (#, date, signed, pres., etc)7 (D..N0_.NA
12" Did all container labels and tags agree with custody papers? <a".NO... NA
13a. Were VOA vials received? YES,,(S).NA
b. Was there any observable head space present in any VOA vial? YES_NO. [
14. Was there a Trip Blank in this tooter? YE5...NO_9M If multiple coolers, sequence #
I certifV that I unloaded the cooler and answered questions 7.14 (intial) Jo hy" _
15a. On pres'd bottles, did pH test strips suggest preservation reached the correct pH level? YES..NO�
b. Aid the bottle labels Indicate that the correct preservatives were used YES ... NO..9!%:
16. Was residual chlorine present? YES.."NO""C'D
I certify that I cliecked for chlorine and pH as per SOP and answered questions 15-16 (intial) d ►UOM
17. Were custody papers properlyfilled out (ink, signed, etc)? .NO...NA
18. Did you sign the custody papers in the appropriate place? 1 Ec .. O_NA
19. Were correct containers used for the analysis requested? (55.N0...NA
20. Was sufficient amount of sample sent in each container? 0E 1..No...NA
I certify that 1 entered this project into LIMS and answered questions 17-20 (intial) ,.,e, 'I --
I certify that I attached a label with the unique LIMS number to each container lintial) oaj} �
21. Were there Non -Conformance issues at Iog1n7 YES-195was a NCM generated? YES.. +E , #
BIS = $10kL11 in shipment
Cooler llmvipt Furrn,doc i_f'-1 RvvisM 12115115
End of Form
Page 17 of 19 10/5/2016

Loc: 490
112156
N
ll)
O
TestAmeri
515-7264177
C ea Y850 FI11aster Clre ghton
TPhone:
all Free: 300.76541M
SHE LEAOCR IN CNV,RONMENTAL, TESTING-. NashNlle, TN 37204
Fax: 615-72&34114
Consultant Name: ARCADIS
TA Account Ilk
PO#: �
A"rerm 111-DSoneem Lane!
Invoice Te: ACCOUNTSPAYABLE.AUMINISTRATION
ARGAUIS-US.Ct7
CitylftateMp: BLUEKIELD, VA 2460
Report To: Paul Goodell
Consultant Project Mgr. Paul Goodell
Project Name: Former BP Faclll *24163
C onsultam. Telephone Number. 919415-2327
Fax No,: 276322.3946
Retail (MRN ik 24163
Sampler Natne2 (Prin)�x ��
Mgjor Project (AFEJ{k
Sampler Signature: ✓L
site Address 381 Kno,b000d St
City, State, by Winston-Salem. North CamnIna
Regulatory District (CA)
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sanylo ID or Field 14
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Tomoarelure upon Receipt �= `
Sample Contalners Intact? V N
VOCs Frft of NBaogpaco? Y N
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TA Pro eu Manager. Dale:
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d

Login Sample Receipt Checklist
Client: ARCADIS U.S., Inc.
Login Number: 112156
List Number: 1
Creator: McBride, Mike
Question
Job Number: 490-112156-1
SDG Number: 381 Knollwood St, Winston-Salem, NC
List Source: TestAmerica Nashville
Answer Comment
Radioactivity wasn't checked or is </= background as measured by a survey
True
meter.
The cooler's custody seal, if present, is intact.
True
Sample custody seals, if present, are intact.
N/A
The cooler or samples do not appear to have been compromised or
True
tampered with.
Samples were received on ice.
True
Cooler Temperature is acceptable.
True
Cooler Temperature is recorded.
True
COC is present.
True
COC is filled out in ink and legible.
True
COC is filled out with all pertinent information.
True
Is the Field Sampler's name present on COC?
True
There are no discrepancies between the containers received and the COC.
True
Samples are received within Holding Time (excluding tests with immediate
True
HTs)
Sample containers have legible labels.
True
Containers are not broken or leaking.
True
Sample collection date/times are provided.
True
Appropriate sample containers are used.
True
Sample bottles are completely filled.
True
Sample Preservation Verified.
N/A
There is sufficient vol. for all requested analyses, incl. any requested
True
MS/MSDs
Containers requiring zero headspace have no headspace or bubble is
True
<6mm (1/4").
Multiphasic samples are not present.
True
Samples do not require splitting or compositing.
True
Residual Chlorine Checked.
N/A
TestAmerica Nashville
Page 19 of 19 10/5/2016

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
Well
Sample Date
Benzene
Ethyl
benzene
Toluene
Xylenes
(Total)
MTBE
Sulfate
arbon
dioxide
NC GCL:
5,000
84,500
260,000
85,500
20,000
NE
NE
INC 2L
1
600
600
500
20
250
NE
Units:
1
1
1
1
1
m l
Mg/1
MW-3
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
8/14/2012
2
2.1
<0.13
0.4J
17.9
3.6
303
9/19/2012
2.7
0.66
< 0.13
0.33 J
19.8
2.8
459
12/5/2012
11.3
1.2
0.43 J
1.11
19.3
0.78 J
377
2/26/2013
0.23 J
< 0.1
< 0.1
< 0.22
5.4
32.6
338
5/31/2013
0.32 J
< 0.1
< 0.1
< 0.22
10.5
17.9
334
8/28/2013
3.6
0.53
0.12 J
0.31 J
10.3
21.9
457
11/7/2013
4.3
0.27 J
0.13 J
< 0.22
10
21.7
536
2/27/2014
< 0.1
< 0.1
< 0.1
< 0.2
1.3
42.2
198
6/3/2014
0.48 J
0.15 J
< 0.1
< 0.2
3.1
10/16/2014
--
--
--
18.0
372
4/23/2015
--
--
--
22.8
296
9/19/2016
--
--
21.3
MW-5
3/23/2006
11,700
2,440
32,000
13,500
16,100
3/23/2006 "'
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 ("
7,400
1,680
20,100
9,290
9,360
5/14/2008
10,000
2,100
29,000
12,000
18,000
5/14/2008("
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)
1 6,510
2,240
22,100
12,900
6,510
MW-5R
5/27/2010
6,610
2,810
24,300 J
15,700
4,330
5/27/2010 ("
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 ("
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
8/14/2012
201
283
1,050
1,300
48.5
14,700
4,190
9/19/2012
158
181
650
883
114
19,000
3,280
12/5/2012
754
505
2,220
2,380
1,160
13,600
1,840
2/26/2013
1,360
878
3,520
3,940
1,660
8,520
1,530
5/31/2013
1,410
1,380
5,930
6,220
1,150 J
4,680
1,560
8/28/2013
165
178
489
1,380
417
13,900
1,590
11/7/2013
214
131
331
969
651
14,400
1,570
2/27/2014
1 142
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
Well
Sample Date
Benzene
Ethyl
benzene
Toluene
Xylenes
(Total)
MTBE
Sulfate
arbon
dioxide
NC GCL:
5,000
84,500
260,000
85,500
20,000
NE
NE
INC 2L
1
600
600
500
20
250
NE
Units:
1
1
1
1
1
m l
m l
MW-SR
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
9/19/2016
--
--
2,880
MW-6
5/12/2003
< 0.5
0.52 J
< 0.5
< 1
3
12/9/2003
2.3
0.64 J
1.1
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
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
MW-6I
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
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
MW 8
3/23/2006
671
1,340
1,230
8,100
124
5/8/2007
1,160
799
196
2,990
1,440
5/14/2008
600
1,800
700
3,000
190
5/28/2009
1,390
2,050
357
3,310
1,560
MW-8R
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 < 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
1 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
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)
1,540
556 J
3,650
2,630 J
2,640 J
10/16/2014
3,310
883
9,070
1 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
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
Well
Sample Date
Benzene
Ethyl
benzene
Toluene
Xylenes
(Total)
MTBE
Sulfate
arbon
dioxide
NC GCL:
5,000
84,500
260,000
85,500
20,000
NE
NE
INC 2L
1
600
600
500
20
250
NE
Units:
1
1
1
1
1
m l
m l
MW-14
5/12/2003
< 0.5
< 0.5
< 0.5
< 1
0.52 J
12/9/2003
< 0.5
< 0.5
< 0.5
1 < 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
5/14/2008
< 0.5
< 0.8
< 0.7
< 0.8
< 0.5
5/28/2009
< 0.06
< 0.05
0.077 J
< 0.14
< 0.06
5/27/2010
< 0.11
< 0.11
< 0.11
< 0.32
< 0.12
10/31/2011
<0.13
<0.15
< 0.42 U1
<0.3
<0.13
1 43.2
<5
6/3/2014
< 0.1
< 0.1
< 0.1
1 < 0.2
< 0.1
MW-15
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
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
1 < 0.2
< 0.1
10/16/2014
<0.1
<0.1
<0.1
<0.2
<0.1
MW-16
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
10/31/2011
< 0.65
17.2
< 1.4 U
321
< 0.65
194
< 5
11/7/2013
--
--
--
55.4
< 5
6/3/2014
< 0.1
25
0.92
417 J
< 0.1
MW 17
5/13/2003
57.7
< 0.5
< 0.5
< 1
69
5/13/2003
40.8
< 0.5
< 0.5
< 1
63.3
12/9/2003
6.6
0.65 J
< 0.5
< 1
80.6
3/23/2006
1
< 0.5
< 0.5
< 1
58.9
5/8/2007
< 0.5
< 0.5
< 0.5
< 1
17.4
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
MW-18
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
21510
2,970
10,100
8,690
1,140
13.8
500
5/31/2013
2,780
3,070
8,210
5,740
1,000
1 83.3
475
8/28/2013
182
368
730
1,660
139
7,850
2,230
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
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
Well
Sample Date
Benzene
Ethyl
benzene
Toluene
Xylenes
(Total)
MTBE
Sulfate
arbon
dioxide
NC GCL:
5,000
84,500
260,000
85,500
20,000
NE
NE
INC 2L
1
600
600
500
20
250
NE
Units:
1
1
1
1
1
m l
m l
MW-19
10/31/2011
2,390
1,380
8,790
7,040
5,160
1 3.7
425
5/22/2012
2,700
1,560
14,200
7,940
4,880
< 5
310
6/15/2012121
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
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
Notes:
(l) Field duplicate
(2) Alkalinity, sulfate, and carbon dioxide samples were collected 6/14/2012 and volatile organic analysis samples
were collected 6/15/12.
-" - Not sampled or analyzed
< - Not detected at the specified detection limit
µg/l - Micrograms per Liter
GCL - Gross Contamination Level
2L - North Carolina Groundwater Quality (2L) Standard
J - Estimated value
mg/l - 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
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