WI0400198_Monitoring (Report)_20171031

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 — 2017
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 — 2017 dated October
31, 2017 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
A019Ide7►1tIIA011
Date:
October 31, 2017
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 - 2017
Former BP Facility #24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
NCDEQ Incident #6400 (Closed)
Injection Permit #W10400198
October 2017

2"d Semi -Annual Monitoring Report - 2017
lr
Alexandra M. Simpson
AFS Task Manager 3
Paul Goodell, E.I.
AFS Project Manager 5
C. Scott Bostian, P.E. 154.' Z �
North Carolina P-zk. Nt., 5669
Senior Engineer �VJge f � �
N
''fir o as
i%
2ND SEMI-ANNUAL
MONITORING REPORT
REPORT - 2017
Prepared for:
Atlantic Richfield Company
c/o BP Products North America, Inc.
Mr. Greg Frisch — Project Manager
4850 E. 4911 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 [phone]
Fax [phone]
www.arcadis-us com
Environmental
Our Ref:
GPI6BPNA.NC10
Date:
October 24, 2017
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.
arcades com

2nd Semi -Annual Monitoring Report - 2017
2nd Semi -Annual Monitoring Report - 2017
Former BP Facility #24163
381 Knollwood St
Winston-Salem, Forsyth County, North Carolina
Latitude 361, 5' 25.94"N Longitude 801) 17' 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 system(s)
1983
Unknown
Former UST System
Atlantic Richfield Company
c/o BP Products North America,
Inc.
Attn: Greg Frisch
4850 East 49h Street
MBC-3 Room 155C
Cuyahoga Heights, Ohio 44125
[phone]
Mr, Charles Sherren
Thruway Shopping Center, LLC.
7501 Wisconsin Ave., Suite 1500
Bethesda, Maryland, 20814
[phone] ext. 215
,p
a Professional Engineer for Arcadis G&M of North
ter,
Carolina, trio., do-certi�rti�t the information contained in this report is correct and accurate to the best of
my knowledge, At'eadis G&M of North Carolina, Inc. is licensed to practice geology and engineering in
North C, rQlin J-TWcerWication numbers of the company are C-155 (geology) and C-1869 (engineering).
>r
ANr waaoc
� ­10F. LO�II

2nd Semi -Annual Monitoring Report - 2017
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 - September 20, 2017
Figure 4. Groundwater Analytical Data - September 2016 - September 2017
Figure 5. Sulfate Isoconcentration Map - September 20, 2017
APPENDICES
A- Historical Groundwater Elevation Data
B- Laboratory Analytical Report and Chain -of -Custody Record — September 20, 2017
C- Historical Groundwater Analytical Data
2
4
4
4
4
5
6
7
arcadis.com

2"d Semi -Annual Monitoring Report - 2017
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 September 20, 2017. 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 20, 2017, 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 13.21 feet below top of
casing (btoc) in groundwater monitoring well MW-18 to 13.67 feet btoc in groundwater monitoring
well MW-5R. The historical groundwater flow direction for the Site is towards the southeast.
On September 20, 2017, 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 September 20, 2017 sampling events are summarized in the table below:
Maximum Groundwater Concentrations (September 20, 2017)
Chemical of
Monitoring Well
Concentration
North Carolina
Concern
ID
(mg/L)
Groundwater
(COC)
Quality (2L)
Standards
Sulfate
MW-5R
1,060
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-5R, MW-8R, MW-18, and MW-19.
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 2018. 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
analysis of sulfate by Standard Method 9056A. A Semi -Annual Groundwater Monitoring Report
documenting the proposed activities for 2018 will be submitted to the NCDEQ for review and
approval within 45-days of receipt of the laboratory analytical report.
arcadis.com ES-1

2"d Semi -Annual Monitoring Report - 2017
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 - 2017
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 - 2017
2.0 GROUNDWATER MONITORING
2.1 Groundwater Gauging
On September 20, 2017 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 13.21 btoc in groundwater monitoring well MW-18 to 13.67 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 Ground water Sampli ng
On September 20, 2017, 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 r2 x (TD-DTW) x 7.481 = gallons of water (1 well volume)
Where: r = radius of well (in feet)
TD = total depth of well (in feet)
DTW = depth to water (in feet)
In order to ensure that the water in the wells after purging is representative of the water in the
aquifer, a minimum of three well volumes were removed.
Groundwater samples obtained from the groundwater monitoring well were collected from
disposable polyethylene bailers using new nylon rope. Groundwater samples were placed in
laboratory supplied containers and shipped on wet ice to TestAmerica Inc. in Nashville,
Tennessee, for analysis of Sulfate (SO4) by Standard Method 9056A. Groundwater samples
submitted for sulfate analysis were collected in 250-milliliter plastic bottles.
The laboratory analytical report and chain -of -custody record for the September 20, 2017
groundwater sampling event is included as Appendix B.
2.3 Groundwater Analytical Results
Groundwater analytical data from the September 20, 2017 groundwater sampling event indicated
the following:
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2"d Semi -Annual Monitoring Report - 2017
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 (1,060 mg/L), MW-8R (797 mg/L), MW-18 (257 mg/L), and MW-
19 (1,020 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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2nd Semi -Annual Monitoring Report - 2017
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 - 2017
4.0 CONCLUSIONS AND RECOMMENDATIONS
Dissolved -phase sulfate was detected above the applicable 2L groundwater quality standard for
sulfate of 250 mg/L in groundwater monitoring wells MW-5R, MW-8R, MW-18, and MW-19 on
September 20, 2017.
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 2018. 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
analysis of sulfate by Standard Method 9056A. A Semi -Annual Groundwater Monitoring Report
documenting the proposed activities for 2018 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 - 2017
TABLES
arcadis.com

Table 1
Monitoring Well Construction Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
ARCADI Design & CnnsuLYancy
00 � for naturaland
built assets
7MW-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
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MW-5R
9/20/2017
NM
ND
13.67
0.00
NM
MW-8R
9/20/2017
NM
ND
13.61
0.00
NM
MW-18
9/20/2017
NM
ND
13.21
0.00
NM
MW-19
9/20/2017
NM
ND
13.48
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
ARCADISA15
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Sample. �.
Date Sampled 9/20/2017 9/20/2017 9/20/2017 9/20/2017
Units mg/L mg/L mg/L mg/L
Sulfate 1,060 797 257 1,020
Notes:
mg/L - milligrams per liter
BOLD text indicates exceendance of NC groundwater standard 2L for sulfate (250 mg/L).
Page 1 of 1

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2nd SEMI-ANNUAL MONITORING REPORT - 2017
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'
ISLAND (TYP)
I
CONCRETE
FO ER
TAN OLD
0 0
T
0 30 60
FORMER
0 0
• UO uI'Fbi
CANOPY
aaaaaaaal
I
GRAPHIC SCALE
❑
-
I
FORMER
VENT RISERS
00
ATLANTIC RICHFIELD COMPANY
C/O BP PRODUCTS NORTH AMERICA, INC.
pp0
FORMER BP STATION 24163
381 KNOLLWOOD ST., WINSTON-SALEM, NORTH CAROLINA
2nd SEMI-ANNUAL MONITORING REPORT - 2017
MW-15 00
FORMER
OG0
VENT RISERS
POTENTIOMETRIC SURFACE MAP
SEPTEMBER 20, 2017
O M.H.
FIGURE
for natural. and
PARCADIS Wil
I
lmlsset.

O M.H.
O
• U.P. • U.P.
• UP ONCRETE LEGEND:
— — — PROPERTY LINE
GRASS E CTRIC ABANDONED GROUNDWATER MONITORING WELL
PARKING M TER
MW 17 FORMER PRODUCT LINE
Oc.6.
` CATCH BASIN
Q M.H. MAN HOLE
' AREA LIGHT
• U.P. UTILITY POLE
ASPHALT
TRASH F.H. FIRE HYDRANT
PARKING ENCLOSU
` TELEPHONE
MW-3 METAL in LARGE MANHOLE COVER
SHED �
Zo GROUNDWATER MONITORING WELL
W F — — — — — METAL SHED mg/L MILLIGRAMS PER LITER
���Lu I •
FORME ASCLINE I FORMER `
'^ AREA I BP SERVICE
V / STAT
E]
Q I MW-18 — — �
CONCRETE
0 PA NOTE:
0 1. THE NORTH CAROLINA 2L STANDARD FOR SULFATE IS 250 mg/L
MW-S--- MW-5R MW-14
J I 2. VALUES IN BOLD EXCEED NORTH CAROLINA 2L STANDARDS.
M W-8
MW-16 F.H. ��, FORMER PUMP �Q
0 ' �T M W - 8 R ISLAND(( Y') `
FORMER
Z MW-6i I CANOPY
PARKING
I JMW-1I —_
��_� 11:
FORMER DIESEL11
I#-s.USTiREAMW-6
' FORMER PUMP
ISLAND(TYP)
I
CONCRETE
FO ER
TAN OLD
0 0 0 o FORMER T 0 30 60
0 0 0 0 CANOPY
•
❑ I — I GRAPHIC SCALE
FORMER
VENT RISERS ATLANTIC RICHFIELD COMPANY
C/O BP PRODUCTS NORTH AMERICA, INC.
00o FORMER BP STATION 24163
381 KNOLLWOOD ST., WINSTON-SALEM, NORTH CAROLINA
2nd SEMI-ANNUAL MONITORING REPORT - 2017
OG0 MW-15 FORMER
VENT RISERS GROUNDWATER ANALYTICAL DATA
SEPTEMBER 2016 - SEPTEMBER 2017
O M.H. /� /�
A`VADIS for natural. Willmassets�d._ I FIGURE
MW-8R
Date
9/19/2016
3/3/2017
9/20/2017
SO4
1,330
1,720
797
MW-18
Date
9/19/2016
3/3/2017
9/20/2017
SO4
377
295
257
MW-5R
Date
9/19/2016
3/3/2017
9/20/2017
SO4
2,880
3,570
1,060
MW-19
Date
9/19/2016
3/3/2017
9/20/2017
SO4
1,270
941
1,020
LEGEND
Abbreviation
Constituent
2 L
SO4
Sulfate
250

O M.H.
O
U.P. • U.P.
U.P.
ONCRETE
GRASS ELECTRIC
PARKING M TER
I LEGEND:
MW-17
— — — PROPERTY LINE
`
f ABANDONED GROUNDWATER MONITORING WELL
FORMER PRODUCT LINE
' QC.B. CATCH BASIN
ASPHALT TRASH O M.H. MAN HOLE
PARKING ENCLOSURE
` AREA LIGHT
MW-3 METAL N� • U.P. UTILITY POLE
SHED
vo � F.H.
FIRE HYDRANT
r — — — — — — METAL SHED
W
I TELEPHONE
W
I LARGE MANHOLE COVER
w
I I GROUNDWATER MONITORING WELL
FORMER GASOLINE FORMER `
co
UST AREA I BP SERVICE (1,060) SULFATE CONCENTRATION (mg/L)
`��
STATION
` 250 ESTIMATED SULFATE CONCENTRATION CONTOUR 2L
coNCRETE STANDARD (mg/L)
PAD
O
` 0 °m (mg/L) MILLIGRAMS PER LITER
N/ M257)8
O
o°
MW-5 MW-5R MW-14
J
I (1,os0)
MW- — — — O sly NOTE:
�Q
MW-16
O
F.H. FORMER PUMP I
MW-8R ISLAND (TYP) ` FORMER 1. THE NORTH CAROLINA 2L STANDARD FOR SULFATE IS 250 mg/L
Z
1
MW-6i 797 CANOPY 2. SHADED VALUES EXCEED NORTH CAROLINA 2L STANDARDS.
PARKING
I �I
_
MW-19 _
(1,02U) FOR DIESEL —
`i I IREA I I `
_
MW-6
FORMER PUMP
'
ISLAND(TYP)
CONCRETE
FO ER
TAN OLD
0 00 30' 60'
FORMER
0 o
CANOPY aaaaaaaal
UO
I GRAPHIC SCALE
❑
— I
FORMER
VENT RISERS ATLANTIC RICHFIELD COMPANY
00 C/O BP PRODUCTS NORTH AMERICA, INC.
�p0 FORMER BP STATION 24163
381 KNOLLWOOD ST., WINSTON-SALEM, NORTH CAROLINA
2nd SEMI-ANNUAL MONITORING REPORT - 2017
Mw-15 00
FORMER
0°0
VENT RISERS SULFATE ISOCONCENTRATION MAP
SEPTEMBER 20, 2017
O M.H.
FIGURE
PARCADIS for natural.
builtaassetsnd I

APPENDIX A
Historical Groundwater Elevation Data

Appendix A
Historical Groundwater Elevation Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
P ARCAD I S Oesign 8 rmisul[a uy
firmtwaland
nulttamts
* 06/24/93
ND
13.89
0.00
85.14
08/23/94
ND
14.36
0.00
84.67
03/21/95
ND
13.58
0.00
85.45
08/05/96
ND
13.54
0.00
85.49
11/17/98
ND
14.09
0.00
84.94
06/19/01
ND
14.11
0.00
84.92
09/12/01
ND
14.41
0.00
84.62
12/27/01
ND
14.51
0.00
84.52
03/05/02
ND
14.29
0.00
84.74
05/13/03
ND
14.35
0.00
84.68
12/09/03
ND
13.63
0.00
85.40
03/23/06
ND
13.64
0.00
85.39
05/08/07
ND
13.40
0.00
85.63
05/14/08
ND
13.42
0.00
85.61
05/28/09
ND
13.31
0.00
85.72
05/27/10
ND
13.07
0.00
85.96
10/31/11
ND
13.87
0.00
85.16
MW-3
99.03
05/22/12
ND
13.55
0.00
85.48
06/14/12
ND
13.53
0.00
85.50
07/09/12
ND
13.98
0.00
85.05
08/14/12
ND
14.24
0.00
84.79
09/19/12
ND
14.08
0.00
84.95
12/05/12
ND
14.42
0.00
84.61
02/26/13
ND
13.55
0.00
85.48
05/31/13
ND
13.58
0.00
85.45
08/28/13
ND
13.57
0.00
85.46
11/07/13
ND
14.30
0.00
84.73
02/27/14
ND
13.28
0.00
85.75
06/02/14
ND
13.34
0.00
85.69
10/16/14
ND
14.18
0.00
84.85
04/23/15
ND
13.54
0.00
85.49
04/28/16
ND
13.51
0.00
85.52
09/19/16
ND
13.92
0.00
85.11
03/03/17
ND
NM
0.00
NM
06/24/93
ND
13.51
0.00
85.88
08/23/94
ND
13.82
0.00
85.57
03/21/95
ND
13.71
0.00
85.68
08/05/96
ND
13.54
0.00
85.85
11/17/98
ND
14.08
0.00
85.31
06/19/01
NM
NM
NM
NM
09/12/01
ND
14.46
0.00
84.93
MW-5 12/27/01
99.39 14.51
15.07
0.56
84.73
03/05/02
14.45
14.88
0.43
84.82
05/12/03
NM
NM
NM
NM
12/09/03
13.18
13.60
0.42
86.10
03/23/06
ND
13.67
0.00
85.72
05/08/07
ND
13.45
0.00
85.94
05/14/08
ND
13.51
0.00
85.88
05/28/09
ND
13.39
0.00
86.00
Page 1 of 5

Appendix A
Historical Groundwater Elevation Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
AAFRCJaDIS OfinwdnalandeIIgtE ''1ta ry
FE05/27/101
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
MW-5R 08/28/13
NS
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
03/03/17
ND
14.01
0.00
NM
09/20/17
ND
13.67
0.00
NM
06/24/93
ND
12.31
0.00
86.37
08/23/94
ND
12.61
0.00
86.07
03/21/95
ND
13.15
0.00
85.53
08/05/96
ND
12.39
0.00
86.29
11/17/98
ND
13.16
0.00
85.52
06/19/01
NM
NM
NM
NM
09/12/01
ND
13.51
0.00
85.17
12/27/01
ND
13.61
0.00
85.07
03/05/02
ND
11.02
0.00
87.66
MW-6
98.68
05/12/03
ND
11.10
0.00
87.58
12/09/03
ND
13.49
0.00
85.19
03/23/06
ND
11.79
0.00
86.89
05/08/07
ND
12.50
0.00
86.18
05/14/08
ND
12.16
0.00
86.52
05/28/09
ND
10.64
0.00
88.04
05/27/10
ND
11.84
0.00
86.84
10/31/11
ND
12.95
0.00
85.73
06/02/14
ND
12.38
0.00
86.30
06/24/93
ND
NM
0.00
NM
08/23/94
ND
NM
0.00
NM
03/21/95
ND
14.75
0.00
84.51
08/05/96
ND
14.13
0.00
85.13
11/17/98
ND
14.09
0.00
85.17
06/19/01
ND
18.07
0.00
81.19
09/12/01
ND
16.60
0.00
82.66
12/27/01
ND
14.61
0.00
84.65
03/05/02
ND
14.96
0.00
84.30
MW-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 5

Appendix A
Historical Groundwater Elevation Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
AAFRCJaDIS OfinwdnalandeIIgtE ''1ta ry
=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
MW-8R 08/28/13
NS
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
03/03/17
ND
13.92
0.00
NM
09/20/17
ND
13.61
0.00
NM
06/24/93
NM
NM
NM
NM
08/23/94
NM
NM
NM
NM
03/21/95
ND
13.55
0.00
86.89
08/05/96
ND
13.64
0.00
86.80
11/17/98
ND
14.26
0.00
86.18
06/19/01
ND
14.55
0.00
85.89
09/12/01
ND
14.81
0.00
85.63
12/27/01
ND
14.85
0.00
85.59
03/05/02
ND
14.64
0.00
85.80
MW-14 05/12/03
100.44
ND
13.41
0.00
87.03
12/09/03
ND
13.51
0.00
86.93
03/23/06
ND
13.82
0.00
86.62
05/08/07
ND
13.54
0.00
86.90
05/14/08
ND
13.64
0.00
86.80
05/28/09
ND
13.47
0.00
86.97
05/27/10
ND
13.00
0.00
87.44
10/13/11
ND
14.14
0.00
86.30
06/02/14
ND
13.42
0.00
87.02
04/28/16
ND
13.65
0.00
86.79
Page 3 of 5

Appendix A
Historical Groundwater Elevation Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
AAFRCJaDIS OfinwdnalandeIIgtE ''1ta ry
FM06/24/931
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
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
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
AAFRCJaDIS OfinwdnalandeIIgtE ''1ta ry
101 1/11
ND
13.95
0.00
NM
05 212112
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
MW-18
NS
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
03/03/17
ND
14.08
0.00
NM
09/20/17
ND
13.21
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
MW-19
NS
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
03/03/17
ND
13.79
0.00
NM
09/20/17
ND
13.48
0.00
NM
Notes:
1. Measured in feet relative to site datum
2. Corr. GW Elev. _ (ref. point elevation) - (depth to groundwater) + (LNAPL thickness)(LNAPL specific gravity)
3. LNAPL specific gravity assumed to be 0.73
* - Prior to URS' work at this Site, monitoring well MW-3 has previously been reported as MW-2, monitoring well MW-6
has previously been reported as MW-8, and monitoring well MW-8 has previously been reported as MW-6.
LNAPL = Light non -aqueous phase liquid
ND = Not detected
NM = Not measured
NS = Not Surveyed
TOC = Top of casing
btoc = below top of casing
- During the May 2003 sampling event LNAPL was observed in MW-5. Depth to groundwater and thickness of LNAPL were not measured.
Page 5 of 5

APPENDIX B
Laboratory Analytical Report and Chain -of -Custody Record —
September 20, 2017

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: 490-137200-1
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
q4*jujces��
Authorized for release by.
9/29/2017 10:33:43 PM
Heather Wagner, Project Manager 1
[phone]
[e-mail]
Designee for
Jennifer Huckaba, Project Manager 11
[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: 490-137200-1
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
Receipt Checklists .........................................
17
TestAmerica Nashville
Page 2 of 17 9/29/2017

Sample Summary
Client: ARCADIS U.S., Inc.
TestAmerica Job ID: 490-137200-1
Project/Site: BP #24163 - Winston-Salem, NC
SDG: 381 Knollwood St, Winston-Salem, NC
Lab Sample ID Client Sample ID
Matrix
Collected Received
490-137200-1 MW-5R
Water
09/20/17 15:15 09/22/17 09:40
490-137200-2 MW-8R
Water
09/20/17 15:00 09/22/17 09:40
490-137200-3 MW-18
Water
09/20/17 15:30 09/22/17 09:40
490-137200-4 MW-19
Water
09/20/17 14:45 09/22/17 09:40
TestAmerica Nashville
Page 3 of 17 9/29/2017

Case Narrative
Client: ARCADIS U.S., Inc.
Project/Site: BP #24163 - Winston-Salem, NC
Job ID: 490-137200-1
Laboratory: TestAmerica Nashville
Narrative
TestAmerica Job ID: 490-137200-1
SDG: 381 Knollwood St, Winston-Salem, NC
0
Job Narrative
490-137200-1
Comments
No additional comments.
Receipt
The samples were received on 9/22/2017 9:40 AM; the samples arrived in good condition, properly preserved and, where required, on ice
The temperature of the cooler at receipt was 0.21 C.
HPLC/IC
No analytical or quality issues were noted, other than those described in the Definitions/Glossary page.
TestAmerica Nashville
Page 4 of 17 9/29/2017

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: 490-137200-1
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 17 9/29/2017

Client: ARCADIS U.S., Inc.
Project/Site: BP #24163 - Winston-Salem, NC
Client Sample ID: MW-5R
Date Collected: 09/20/17 15:15
Date Received: 09/22/17 09:40
Client Sample Results C
TestAmerica Job ID: 490-137200-1
SDG: 381 Knollwood St, Winston-Salem, NC
Method: 9056A - Anions, Ion Chromatography
Analyte Result Qualifier RL
Sulfate 1060 100
Lab Sample ID: 490-137200-1
Matrix: Water
MDL Unit D Prepared
mg/L
Analyzed Dil Fac
09/29/17 03:18 100
TestAmerica Nashville
Page 6 of 17 9/29/2017

Client Sample Results C
Client: ARCADIS U.S., Inc. TestAmerica Job ID: 490-137200-1
Project/Site: BP #24163 - Winston-Salem, NC SDG: 381 Knollwood St, Winston-Salem, NC
Client Sample ID: MW-8R Lab Sample ID: 490-137200-2
Date Collected: 09/20/17 15:00 Matrix: Water
Date Received: 09/22/17 09:40
Method: 9056A - Anions, Ion Chromatography
Analyte Result Qualifier RL
Sulfate 797 50.0
MDL Unit D Prepared Analyzed Dil Fac
mg/L 09/29/17 03:36 50
TestAmerica Nashville
Page 7 of 17 9/29/2017

Client Sample Results C
Client: ARCADIS U.S., Inc. TestAmerica Job ID: 490-137200-1
Project/Site: BP #24163 - Winston-Salem, NC SDG: 381 Knollwood St, Winston-Salem, NC
Client Sample ID: MW-18 Lab Sample ID: 490-137200-3
Date Collected: 09/20/17 15:30 Matrix: Water
Date Received: 09/22/17 09:40
Method: 9056A - Anions, Ion Chromatography
Analyte Result Qualifier
Sulfate 257
RL MDL Unit D Prepared Analyzed Dil Fac
25.0 mg/L 09/29/17 04:13 25
TestAmerica Nashville
Page 8 of 17 9/29/2017

Client Sample Results C
Client: ARCADIS U.S., Inc. TestAmerica Job ID: 490-137200-1
Project/Site: BP #24163 - Winston-Salem, NC SDG: 381 Knollwood St, Winston-Salem, NC
Client Sample ID: MW-19 Lab Sample ID: 490-137200-4
Date Collected: 09/20/17 14:45 Matrix: Water
Date Received: 09/22/17 09:40
Method: 9056A - Anions, Ion Chromatography
Analyte Result Qualifier
Sulfate 1020
RL MDL Unit D Prepared Analyzed Dil Fac
100 mg/L 09/29/17 04:31 100
TestAmerica Nashville
Page 9 of 17 9/29/2017

QC Sample Results
Client: ARCADIS U.S., Inc.
Project/Site: BP #24163 - Winston-Salem, NC
Method: 9056A - Anions, Ion Chromatography
Lab Sample ID: MB 490-464215/3
Matrix: Water
Analysis Batch: 464215
MB MB
Analyte Result Qualifier RL
Sulfate ND 1.00
Lab Sample ID: LCS 490-464215/4
Matrix: Water
Analysis Batch: 464215
TestAmerica Job ID: 490-137200-1
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 09/29/17 02:24 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
10.0
10.41
mg/L
104
—
80 -120
Lab Sample ID: LCSD 490-464215/5
Client Sample
ID: Lab Control Sample Dup
Matrix: Water
Prep Type: Total/NA
Analysis Batch: 464215
Spike
LCSD
LCSD
%Rec. RPD
Analyte
Added
Result
Qualifier Unit
D %Rec
Limits RPD Limit
Sulfate
10.0
10.50
mg/L
105
80-120 1 20
TestAmerica Nashville
Page 10 of 17 9/29/2017

QC Association Summary
Client: ARCADIS U.S., Inc.
Project/Site: BP #24163 - Winston-Salem, NC
TestAmerica Job ID: 490-137200-1
SDG: 381 Knollwood St, Winston-Salem, NC
HPLC/IC
Analysis Batch: 464215
Lab Sample ID Client Sample ID
Prep Type
Matrix
Method Prep Batch
490-137200-1 MW-5R
Total/NA
Water
9056A
490-137200-2 MW-8R
Total/NA
Water
9056A
490-137200-3 MW-18
Total/NA
Water
9056A
490-137200-4 MW-19
Total/NA
Water
9056A
MB 490-464215/3 Method Blank
Total/NA
Water
9056A
LCS 490-464215/4 Lab Control Sample
Total/NA
Water
9056A
LCSD 490-464215/5 Lab Control Sample Dup
Total/NA
Water
9056A
TestAmerica Nashville
Page 11 of 17 9/29/2017

Client: ARCADIS U.S., Inc.
Project/Site: BP #24163 - Winston-Salem, NC
Client Sample ID: MW-5R
Date Collected: 09/20/17 15:15
Date Received: 09/22/17 09:40
Batch Batch
Prep Type Type Method Run
Total/NA Analysis 9056A
Client Sample ID: MW-8R
Date Collected: 09/20/17 15:00
Date Received: 09/22/17 09:40
Batch Batch
Prep Type Type Method Run
Total/NA Analysis 9056A
Client Sample ID: MW-18
Date Collected: 09/20/17 15:30
Date Received: 09/22/17 09:40
Lab Chronicle C
TestAmerica Job ID: 490-137200-1
SDG: 381 Knollwood St, Winston-Salem, NC
Lab Sample ID: 490-137200-1
Matrix: Water
Dil
Initial
Final
Batch Prepared
Factor
Amount
Amount
Number or Analyzed Analyst Lab
100
464215 09/29/17 03:18 JHS TAL NSH
Lab Sample ID: 490-137200-2
Matrix: Water
Dil
Initial
Final
L
Batch Prepared
Factor
Amount
Amount
Number or Analyzed Analyst Lab
50
464215 09/29/17 03:36 JHS TAL NSH
Lab Sample ID: 490-137200-3
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
25
464215
09/29/17 04:13 JHS TAL NSH
Client Sample ID: MW-19
Date Collected: 09/20/17 14:45
Date Received: 09/22/17 09:40
Lab Sample ID: 490-137200-4
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 100 464215 09/29/17 04:31 JHS TAL NSH
Laboratory References:
TAL NSH = TestAmerica Nashville, 2960 Foster Creighton Drive, Nashville, TN 37204, TEL [phone]
Page 12 of 17
TestAmerica Nashville
9/29/2017

Method Summary
Client: ARCADIS U.S., Inc.
Project/Site: BP #24163 - Winston-Salem, NC
TestAmerica Job ID: 490-137200-1
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 17 9/29/2017

Accreditation/Certification Summary C
Client: ARCADIS U.S., Inc. TestAmerica Job ID: 490-137200-1
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 12-31-17
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 17 9/29/2017

Test medca
THE LEADER IN ENVIRONMENTAL TESTING
�������1�(�ii iif111lull IIIII
Nashville, TN COOLER RECEIPT FORM
490-137200 Chain of Custody
Cooler Received/Opened On_9/22/17 0940
Time Samples Removed From Cooler Time Samples Placed In Storage
I
(2 Hour Window)
Z3
1. Tracking # I(last 4 digits, FedEx) Courier: _FedEx_
IR Gun ID_17960353 pH Strip Lot Chlorine Strip Lot
2. Temperature of rep, sample or temp blank when opened: Degrees Celsius
i
3. If Item #2 temperature is 0°C or less, was the representative sample or temp blank frozen?
YES NO... 1� JJJIi
4. Were custody seals on outside of cooler?
E ...NO...NA
If yes, how many and where:
5. Were the seals intact, signed, and dated correctly?
ES..NO... NA i
6. Were custody papers inside cooler?...NO...NA
I certifV that I opened the cooler and answered questions 1-6/6''(intial)
7. Were custody seals on containers: YES QO/ and Intact
YES ... NO.0
Were these signed and dated correctly?
YES ... NO.S�l i
8. Packing mat'I used? Bubblewrap Plastic b Peanuts Vermiculite Foam Insert Paper Other None 1
9. Cooling process: Ic Ice -pack Ice (direct contact) Dry ice
Other None
10, Did all containers arrive in good condition (unbroken)?
3E ..NO ... NA
11. Were all container labels complete (#, date, signed, pres., etc)?
YE ... NO ... NA
12. Did all container labels and tags dgree with custody papers?
... NO ... NA
13a. Were VOA vials received?
YES.<N ..NA
b. Was there any observable headspace present in any VOA vial?
YES ...NO.,
® On Larger than this.
14. Was there a Trip Blank in this cooler? YES. .9..NA If muitipil co r� sequence #_ IA
1 certify that I unloaded the cooler and answered questions 7-14 (intial) //�
15a. On pres'd bottles, did pH test strips suggest preservation reached th c rre level? ...
NO ... NA
b. Did the bottle labels indicate that the correct preservatives were used V...NO... NA
16. Was residual chlorine present? YES..A... NA
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)? dft... NO...NA
18. Did you sign the custody papers in the appropriate place? ...NO ... NA
19. Were correct containers used for the analysis requested? NO ... NA
20. Was sufficient amount of sample sent in each container?/ ft-NO...NA
I certify that I entered this project into LIMS and answered questions 17-20 (intial) AN
21. Were there Non -Conformance issues at login? YES.. NO Was a NCM generated? YES..4... #
BIS = Broken in shipment
Cooler Receipt Fonn.doc LF-1 Revised 8/23/17
End of Fonn
Page 15 of 17
9/29/2017

N
N
O
TestAmerica Nashville
2960 Foster Creighton Drive
Nashville, TN 37204
Phone [phone] Fax [phone]
Chain of Custody Record
TestAmedca
THE LEADER IN ENVIRONMENTAL TESTENG
Client Information
Sampler,
�vJ • rr;(
Lab PM:
Huckaba, Jennifer
[[e-mail]
Carrier Tracking No(s):
COC No:
490-71997-22130.1
Client Contact:
l:
Paul Goodell
Phone `7 +
. -aa . Q3 d j
E-mail:
Page
Page)of
Company:
ARCADIS U.S., Inc.
Analysis Requested
Job*
Address:
801 Corporate Center Drive Suite 300
Due Date Requested: -.. 1
o
? $
m
}•
m
E I
= 'yya
—
lZ ..
a ,
—
rn
J
Hi
o
e
Loc: 490
13720a
m
5
0
E
0
z.
R
F° .
Preservation Codes:
A - HCL M -Hexane
6 - NaOH N - None
C - Zn Acetate O - AsNa02
D - Nitric Acid P - Na2O4S
E - NaHSO4 0 - Na2SO3
F - McOH R - Na2S203
G-Amcrnor S -Hzsoa
H -Ascorbic Acid T -TSP Dodecahydrate
I - Ice U - Acetone
K- EDTAter W pH 4 5
L -EDA Z- other(specify)
Other:
City:
Raleigh
TAT Requested (days):
/pr d(1/
/ V f� a
J
State, Zip:
NC, 27607-5073
Phone:
919-415-2299(Tel)
PO #:
Purchase Order not required
Email:
[e-mail]
WO #:
Project Name:
BP #24163 - Winston-Salem, NC
Project#:
49011104
Site:
381 Knollwood St, Winston-Salem, NC
SSOW#.
Sample Identification
Sample Date
Sample
Time
Sample
Type
Yp
(C=comp,
G=grab)
Matrix
(#=Meter.
s=.atd,
o=wesrercn,
aT=resee,A=A,r
S ecial Instructions/Note:
Presefvatinn Codei"'
•^
;.
F
167
It
Possible Hazard Identification I�
��'' Non -Hazard =Flammable kin Irritant `Poison B �nknown radiological
Sample Disposal (A fee maybe sensed if samples are retained longer than 1 month)
Return To Client maybe
By Lab =rchive For Months
Deliverable Requested: I, II, 111, IV, Other (specify)
Special Instructions/QC Requirements:
Empty Kit Relinquished by: Date: Time: Method of Shipment:
Relinquishedb L
rD+aate/Time: J
V4, l �- /�DS
Comp
'S
Repeiivo Q
� t ` � 1 Z y 3 I
Date Time: /�
O9,a) (� ��VS�
Co�m-p-an _
! f J L�
Relinquished by,
Daterrime:
Company
Received by:
Datenime.
Company
Relinquished by,
DateRme:
Company
Rec etl ny:
Datemme:
Com� j
Custody Seals Intact:
A Yes A No
Custody Seal No.:
Cooler Temperature(411pjAd Other marks:
F-1

Login Sample Receipt Checklist
Client: ARCADIS U.S., Inc.
Login Number: 137200
List Number: 1
Creator: Abernathy, Eric
Question
Job Number: 490-137200-1
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
N/A
meter.
The cooler's custody seal, if present, is intact.
True
Sample custody seals, if present, are intact.
True
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 17 of 17 9/29/2017

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
AARCADI {ar atu a{andd any
krn tumi
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
2 J
13.1
5/14/2008
4.3 J
< 0.8
_1.4
< 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
4/23/2015
22.8
296
9/19/2016
21.3
3/23/2006
11,700
2,440
32,000
13,500
16,100
3/23/2006 (1)
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
1,150 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
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
AARCADI {ar atu a{andd any
krn tumi
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
MW-5R
4/28/2016
2,980
9/19/2016
2,880
3/3/2017
3,570
9/20/2017
1,060
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
< 75
12/9/2003
< 2.5
< 2.5
< 2.5
< 5
< 2.5
3/23/2006
49.7
18.9
48.7
443
3,560
5/8/2007
< 25
< 25
< 25
< 50
6,910
MW-61
5/14/2008
5.2 J
< 2
< 1.8
< 2
3,400
5/28/2009
2.5
< 0.05
< 0.06
< 0.14
1,150
5/27/2010
1.6 J
< 1.1
< 1.1
< 3.2
492
10/31/2011
0.41 J
< 0.36
< 0.32
< 0.75
122
< 1
76.1
6/2/2014
< 0.1
< 0.1
< 0.1
< 0.2
3.3
3/23/2006
671
1,340
1,230
8,100
124
5/8/2007
1,160
799
196
2,990
1,440
MW 8
5/14/2008
600
1,800
700
3,000
190
5/28/2009
1,390
2,050
1
3,310
1,560
5/27/2010
8,570
2,870
_357
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
2,600
7,010
1,560
9/19/2012
4,780
1,800
20,900
10,400
2,&0
6,700
1,100
12/5/2012
7,760
2,440
31,900
13,800
4,560
2,410
635
2/26/2013
7,310
2,480
30,500
13,400
4,530
959
590
5/31/2013
6,540
3,040
30,500
12,500
4,200
439
437
8/28/2013
1,600
628
5,390
1,380
4,770
703
MW-8R
11/7/2013
1,130
329
2,440
_3,990
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
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
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
< 6.05
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
MW-15
MW-16
MW-17
MW-18
NC GCL: 5,000
NC 2L 1
Units: ua/I
5/8/2007
5/14/2008
5/27/2010
10/31/2011
6/3/2014
10/16/2014
3/23/2006
5/14/2008
5/27/2010
10/31/2011
11/7/2013
6/3/2014
5/13/2003
5/13/2003
12/9/2003
3/23/2006
5/8/2007
5/14/2008
5/28/2009
5/27/2010
10/31/2011
6/3/2014
10/31/2011
5/22/2012
6/15/2012 (2)
7/9/2012
8/14/2012
9/19/2012
12/5/2012
2/26/2013
5/31 /2013
8/28/2013
11/7/2013
2/27/2014
6/2/2014
10116I2014
4/23/2015
10/13/2015
4/29/_2016
19/ 9/2016
3/3/2017
< 0.5
< 0.5
< 0.11
< 0.13
< 0.1
<0.1
< 2.5
< 0.5
3.6
< 0.65
< 0.1
57.7
40.8
6.6
1
< 0.5
3.7 J
7
5.7
0.51
< 0.1
3,140
2,280
373
1,730 J
3,020
3,190
3,370
2,510
2,780
182
1,140
16.6
26.2 J
359
AARCADI {ar atu a{anddlanav
krn tumi
84,500 260,000 85,500 20,000 NE NE
600 600 500 20 250 NE
2.1
< 0.5
18.6
< 0.5
< 0.5
2.2 J
< 0.8
< 0.7
3.7 J
<0.11
<0.11
<0.32
< 0.15
< 0.13
< 0.3
< 0.1
< 0.1
< 0.2
<0.1
<0.1
<0.2
90.8
15.8
836
160
15
1,600
54.7 J
5.1
525 J
17.2
< 1.4 U
321
25
0.92
417 J
< 0.5
< 0.5
< 1
< 0.5
< 0.5
< 1
0.65 J
< 0.5
< 1
< 0.5
< 0.5
< 1
< 0.5
< 0.5
< 1
< 0.8
< 0.7
< 0.8
< 0.05
0.076 J
< 0.14
<0.11
<0.11
<0.32
0.16J
<0.81 U
0.57J
< 0.1
< 0.1
< 0.2
998
11,100
8,950
2,790
18,200
12,000
910
4,800
3,910
2,170 J
15,000 J
9,750 J
2,990
24,400
12,860
3,090
22,600
14,000
2,970
20,100
12,800
2,970
10,100
8,690
3,070
8,210
5,740
368
730
1,660
727
4,910
3,250
109
20.2
45.8
125J
37.5J
31.6J
388
244
138
< 0.5
< 0.5
< 0.12
<0.13
<1
<5
<0.1
2.8 J
4.1 J
1.3
< 0.65
194
< 5
55.4
< 5
< 0.1
69
63.3
80.6
58.9
17.4
19
14.5
12.4
8.9
< 1
422
4.1
1,140
8.2
446
789
< 5
307
114
10,600
3,410
676 J
2,300
835
1,090
758
580
1,240
322
542
1,380
32
436
1,140
13.8
500
1,000
83.3
475
139
7,850
2,230
694
2,640
1,370
18.5
37.4 J
4,310
1,270
364
1,540
513
780
1,100
516
79.4
377
295
257
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
AARCADI {ar atu a{andd any
krn tumi
NC GCL:
NC 2L
Units:
5,000
1
Ng/I
84,500
600
pg/I
260,000
600
ug/I
85,500
500
pg/I
20,000
20
Ng/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
MW 19 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
3/3/2017
941
9/20/2017
1.020
Notes:
(1) Field duplicate
(2)Alkalinity, sulfate, and carbon dioxide samples were collected 6/14/2012 and volatile organic analysis
samples were collected 6/15/12.
-" - Not sampled or analyzed
< - Not detected at the specified detection limit
pg/I - Micrograms per Liter
GCL - Gross Contamination Level
2L - North Carolina Groundwater Quality (2L) Standard
J - Estimated value
mg/I - Milligrams per Liter
MTBE - Methyl tert-Butyl Ether
NE - Not established
U - Not present above the associated level; blank contamination exists
UJ - Not detected and the detection limit is estimated
BOLD text indicates 2L exceedance
Bold cell with green highlight indicates GCL exceedence
Activated sodium persulfate injections were performed at the site from June 4, 2012, to June 9, 2012, and from June 3,
2013, to June 6, 2013.
Page 4 of 4

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