WI0400198_QUARTERLY STATUS REPORT_20131212

December 11, 2013
Mr. Charles Sherren
Thruway Shopping Center, LLC.
7501 Wisconsin Avenue, Suite 1500
Bethesda, Maryland, 20814
RE: Quarterly Status Report
Former Knollwood Gulf Station (BP 24163)
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
Injection Permit WI0400198
NCDENR Incident No. 6400
URS Project number: 38436760
Dear Mr. Sherren:
RECEIVEDIDENRIDWR
DEC 12 2013
Water Quality Regional
Operations Section
Please find enclosed a CD containing an electronic copy of the Quarterly Status Report
for the above referenced site. A CD has been sent based on your previous request for an
electronic copy of reports for the site. Should you want a paper copy as well, or should
you have any questions regarding this submittal, please do not hesitate to contact me at
[phone] or [e-mail].
Sincerely,
URS Corporation — North Carolina
]as i inna,
P1-t j ct Man er
Enc ❑sure
URS Corporation North Carolina
1600 Perimeter Park Drive, Suite 400
Morrisville, NC 27560
Tel: [phone]
Fax: [phone]

QUARTERLY STATUS REPORT
FORMER KNDLLWDDD GULF STATION (BP 24163)
381 KNOLLWOOD STREET
WINSTON-SALEM, FORSYTH COUNTY, NORTH CAROLINA
INCIDENT NO.: 6400
RISK RANK: INTERMEDIATE
LAND USE CLASSIFICATION: INDUSTRIALICOMMERCIAL
URS PROJECT NO.: 38436760
RECEIVEDIDENRIDVVR
DEC 12 2013
Water Quality Regional
Operations Section
Prepared for:
Atlantic Richfield Company (ARCO)
A BP Products North America Inc. by
affiliated company
850 East 49'h Street
MBC-3 Room 103B
Cuyahoga Heights, Ohio 44125 0
December 11, 2013
Prepared by:
URS Corporation — North Carolina
1600 Perimeter Park Drive, Suite 400
Morrisville, North Carolina 27560 U.&O
Tel. [phone]
Fax [phone]

CERTIFICATION PAGE
FORMER KNOLLWOOD GULF STATION (BP 24163)
381 KNOLLWOOD STREET
WINSTON-SALEM, FORSYTH COUNTY, NC
Report Date:
December 11, 2013
Groundwater Incident Number:
6400
Land Use Category:
Industrial/Commercial
Risk Classification:
Intermediate (Gross Contamination Level Exceedences)
Responsible Party:
Atlantic Richfield Company
"o BP Products North America, Inc
850 East 49 h Street
MBC-3 Room 103B
Cuyahoga Heights, Ohio 44125
Attn: Greg Frisch
Current Property Owner:
Thruway Shopping Center, LLC.
7501 Wisconsin Avenue, Suite 1500
Bethesda, Maryland 20814-6522
[phone]
Attn: Charles Sherren or Zane Zynda
Report Prepared By:
URS Corporation - North Carolina
1600 Perimeter Park Drive, Suite 400
Morrisville, North Carolina 27560
919 461-1100
Release Information:
Release of an unknown quantity of gasoline from an
underground storage tank product line 1 ancillary piping
prior to September 1983.
Release Location:
Latitude: 361105'25.94"N (Topographical Map)
Longitude: 80' 1 T i 1.79"W
I, Jasen Zinna, a licensed engineer for URS CorpoTVion �t�North Carolina, do attest that the
info ation contained in this report is correct aQd aNcaAte ;bJ the best of my knowledge.
-�q 'ESSjQ�f ,
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Jase(Zinna, P _� E�q-. _ Date
UR Corporat n — North Carolina :f f' N •i�� �`
UR Corporation — North Carolina is licensed to pAW( jQogy/engineering in North
Carolina. The certification numbers of the corporation are C-328 and C-2243, respectively.
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TABLE OF CONTENTS
1.0
INTRODUCTION .............................................. ..................................................... ........
1-1
L l Site Description ......................... ...
1-1
1.2 Project Background..............................................................................................
1-1
2.0
INJECTION PERFORMANCE MONITORING............................................................
2-1
2.1 Groundwater Sampling Procedures.....................................................................
2-1
2.2 Purge Water Management....................................................................................
2-1
3.0
RESULTS AND DISCUSSION ............................... ........... ......... ...................................
3-1
3.1 Groundwater Sampling Results...........................................................................
3-1
3.2 Performance Monitoring Discussion...................................................................
3-1
4.0
CONCLUSION AND RECOMMENDATIONS........................................................ ....
4-1
5.0
STATEMENT OF LIMITATIONS.................................................................................
5-1
6.0
REFERENCES................................................................................................................6-1
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TABLE OF CONTENTS
TABLES
Table 1 Monitoring Well Construction Data
Table 2 Summary of August 28, 2013, Groundwater Results Compared to NC Gross
Contamination Levels
Table 3 Groundwater Field Parameter Results, August 28, 2013
FIGURES
Figure 1 Location Map
Figure 2 Site Map
APPENDICES
Appendix A Historical Groundwater Elevation Data
Appendix B Waste Manifests
Appendix C Historical Groundwater Analytical Summary
Appendix D Laboratory Analytical Report
Appendix E Historical Groundwater Field Parameter Data
Appendix F ASP Injection Performance Monitoring Parameter Time -Trend Graphs
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SECTIONONE INTRODUCTION
URS Corporation - North Carolina (URS), on behalf of Atlantic Richfield Company (ARCO), a
BP Products North America Inc. affiliated company, is pleased to submit this Quarterly Data
Report for Former BP Station No. 24163 located at 381 Knollwood Street, Winston-Salem,
Forsyth County, North Carolina (site). The report is intended to continue the semi-annual
reporting schedule proposed in the site Corrective Action Plan (CAP) (URS, 2011). This report is
also intended to satisfy the quarterly reporting schedule requirement specified in Part VII, Item 2
of the Renewal Issuance of Injection Permit W10400198 (NCDENR, 2013). This report presents
the procedures and results for the groundwater sampling event performed in August 2013.
1.1 SITE DESCRIPTION
The site is located on the eastern side of Knollwood Street, southeast of its intersection with
Interstate 40 Business in Winston-Salem, North Carolina. A USGS topographic map showing the
site location and surrounding area is provided as Figure 1. The site property is approximately 0.5
acres, is covered by asphalt and concrete, and was formerly developed as a retail fueling
station/convenience store with gasoline, diesel, waste oil, and kerosene underground storage
tanks (USTs). All UST systems and buildings have been removed from the site and the property
is currently used as a parking lot for an adjacent shopping center. Site geology, hydrogeology,
UST removal history, petroleum release history, environmental investigation and remediation
activity history, surrounding property uses, and site ownership history were presented in detail in
the site CAP (URS, 2011).
A site map showing current and historical site features, including groundwater monitoring well
locations, is provided as Figure 2. Currently, ten Type II monitoring wells (MW-3, MW-5R,
MW-6, MW-8R, and MW-14 through MW-19) and one Type III monitoring well (MW-6i) are
located at the site. Monitoring well construction details are presented in Table 1.
1.2 PROJECT BACKGROUND
Two activated sodium persuifate (ASP) injections were performed at the site in accordance with
the CAP which was approved by the North Carolina Department of Environment and Natural
Resources (NCDENR) Division of Waste Management (DWM) UST Section (NCDENR,
201 la). An Underground Injection Control (UIC) permit application, summarizing the proposed
injection activities, was submitted to the NCDENR Division of Water Quality (DWQ) on July S,
2011. Injection Permit No. W10400198 was issued by the DWQ on August 9, 2011 (NCDENR,
2011 b).
Pre -injection investigation and pilot test activities performed in October 2011 were previously
documented in a summary report, dated April 23, 2012, submitted to both the DWQ and the
DWM UST Section (URS, 2012a). A final ASP injection design, refined based on the results of
the pre -design investigation and pilot test results, was also presented in the April 2012 report.
The first ASP injection event was performed at the site between June 4, 2012 and June 9, 2012.
Injection activities and groundwater sampling performance monitoring were performed in
accordance with the approved CAP and Injection Pen -nit No. WI0400198. Baseline data, June
2012 ASP injection activities, and post -injection sampling data through September 2012 were
documented in the Activated Sodium Persulfate Injection Completion Report (URS, 2012b).
Groundwater sampling events performed in December 2012 and February 2013 were
documented in a Semi -Annual Data Report (URS, 2013b).
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SECTIONON E
INTRODUCTION
A permit renewal application was submitted to NCDENR DWQ on March 26, 2013, (URS,
2013a) in advance of the July 31, 2013, permit expiration date. Renewal Issuance of Injection
Permit WI0400198 was issued by the DWQ on May 24, 2013 (NCDENR, 2013).
The second ASP injection event was performed at the site between June 3, 2013 and June 6,
2013. Injection activities and groundwater sampling performance monitoring were performed in
accordance with the approved CAP and Injection Permit No. WI0400198. Baseline groundwater
data (May 2013) and June 2013 ASP injection activities were documented in the most recent
Quarterly Status Report (URS, 2013d).
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SECTIONTWO INJECTION PERFORMANCE MONITORING
2.1 GROUNDWATER SAMPLING PROCEDURES
Groundwater sampling was performed on August 28, 2013. The event included sampling of
monitoring wells MW-3, MW-5R, MW-8R, MW-18, and MW-19 in accordance with the CAP
and approved UIC monitoring plan. Prior to sampling, groundwater levels were gauged in each
of the five monitoring wells utilizing a water level meter decontaminated with soap and water
prior to each measurement. August 2013 water level measurements are presented along with
historical gauging data in Appendix A.
Following gauging, each well was purged and sampled with a new disposable polyethylene
bailer and nylon line. Groundwater from each well was transferred to pre -labeled, laboratory -
prepared containers and promptly placed on ice with a temperature and trip blank. The samples
were shipped under chain -of -custody via overnight courier to Accutest Laboratories Southeast
(Accutest) and analyzed for benzene, toluene, ethylbenzene, and xylenes (BTEX) and methyl
tert-butyl ether (MTBE) utilizing EPA Method 6200B, sulfate utilizing EPA Method 300, and
carbon dioxide (COI) utilizing EPA Method 4500-CO2.
Groundwater pH, dissolved oxygen (D❑), temperature, oxidation-reduction potential (QRP), and
specific conductance were measured in the field at each well using a calibrated Yellow Springs
Instrument YSI-5569 water quality meter.
2.2 PURGE WATER MANAGEMENT
The purge water for all monitoring wells was containerized in a properly labeled 55-gallon dram
and was picked up on August 28, 2013, by Shamrock Environmental Corporation (Shamrock)
and transported off -site for disposal in accordance with applicable Federal, State, and local
regulations. A waste manifest for the purge water drum is included in Appendix B.
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SECTIONTHREE RESULTS AND DISCUSSION
3.1 GROUNDWATER SAMPLING RESULTS
Groundwater laboratory analytical results for the August 28, 2013, samples are presented in
Table 2. Historical analytical data are presented in Appendix C. The laboratory analytical report
for the August 2013 groundwater sampling event is included as Appendix D_ Groundwater field
parameter data for the sampling event are presented in Table 3. Historical field parameter data
are presented in Appendix E. Time -trend graphs of various parameters associated with injection
performance monitoring are included in Appendix F.
3.2 PERFORMANCE MONITORING DISCUSSION
Performance monitoring results through May 2013 are discussed in detail in the Quarterly Status
Report submitted in August 2013 (URS, 2013d). The following list provides a brief summary of
notable performance monitoring trends between May 2013 and August 2013, following the
second injection.
• Contaminant concentrations, including benzene, in monitoring wells MW-SR, MW-
8R, and MW-18 decreased after the June 2012 injection event. Between July 2012
and May 2013, contaminant concentrations increased and ultimately leveled off at or
below baseline conditions. Following the most recent injection, contaminant
concentrations appear to have decreased and are below the GCL in all sampled
monitoring wells.
• Contaminant concentrations in MW-19 increased after the initial injection and shortly
thereafter returned to near pre -injection conditions. Concentrations have remained
relatively stable since August 2012.
• Sulfate concentrations in key wells MW-SR and MW-SR displayed an increase
following the June injection.
• MW-3, sampled as a downgradient "sentinel" monitoring well, has not exhibited a
notable response as a result of the injection in any of the monitoring parameters
tested.
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SECTIONFOUR CONCLUSIONS AND RECOMMENDATIONS
Based on the observations and data collected at the site through the August 2013, URS presents
the following conclusions,
• Following the second ASP injection, contaminant concentrations were reduced in
monitoring wells MW-SR. MW-8R, and MW-18. All analyzed contaminants in the
sampled monitoring wells are below their respective GCL.
• Due to increased dissolved sulfate concentrations created as a byproduct of the ASP
oxidation reaction, ongoing biological degradation of petroleum constituents by
sulfate reducing bacteria may result in additional contaminant reduction over time.
• Aquifer characteristics affected by the injection, including CO2 concentrations,
sulfate concentrations, specific conductivity, and pH, increased when compared to the
May 2013 sampling event as a result of the June 2013 injection.
• Since groundwater parameters for downgradient monitoring well MW-3 have
remained stable, the effects of the injection appear to have been contained to within
the targeted treatment area.
• Based on these conclusions, URS recommends the following course of action:
■ Continue quarterly sampling of monitoring wells MW-3, MW-5R, MW-8R, MW-18,
and MW-19 with sampling event planned for November 2013.
• Maintain quarterly analytical data and injection status reporting in accordance with
Part VII, Item 2 of the Renewal Issuance of Injection Permit WI0400198.
• Sample monitoring well MW-16 in November 2013 in accordance with Part VII, Item
1 of the Renewal Issuance of Injection Permit WI0400198. MW-16 samples will be
analyzed by a certified laboratory for sulfate by EPA Method 300 and carbon dioxide
by EPA Method 4500-CO2. MW-lb sample water will also be tested for pH in the
field using a calibrated water quality meter and for sodium persulfate utilizing FMC's
Klozurg Field Test Kit K.
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SECTIONFIVE STATEMENT OF LIMITATIONS
This report has been prepared based on assumptions made by URS related to data and site
characterization from previous and proposed site investigations. These assumptions, although
thought to be reasonable and appropriate, may not prove to be true in the future. Data and site
characterization utilized to develop this summary report and injection plan are restricted by the
following limitations.
Background information and other data have been furnished to URS by ARCO, NCDENR and/or
third parties, which URS has used in preparing this report. URS has relied on this information as
furnished, and is neither responsible for nor has confirmed the accuracy of this information. In
addition, it would be extremely expensive, and perhaps not possible, to perform an investigation
which would completely characterize subsurface geological conditions to ensure the detection of
all materials at the site which now are, or in the future might be, considered "contaminants" by
State or federal regulatory agencies. It is possible that any environmental investigation may fail
to reveal the presence of critical subsurface characteristics or contaminants that may be present.
URS' failure to discover hazardous materials or contaminants through reasonable and mutually
agreed -upon scopes of work does not guarantee that hazardous materials or contaminants do not
exist at the site. Finally, opinions presented herein apply to the existing and reasonably
foreseeable site conditions at the time of our assessment. Changes in the condition of this
property may occur with time due to natural processes or works of man at the site or on adjacent
properties. Changes in applicable standards may also occur as a result of legislation or the
broadening of knowledge. Accordingly, the findings of this report may be invalidated, wholly or
in part, by changes beyond our control.
No expressed or implied representation or warranty is included or intended in our reports except
that our services were performed, within the limits prescribed by our clients, with the customary
thoroughness and competence of our profession.
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SECTIONSIX REFERENCES
NCDENR, 2008. Guidelines for Sampling. UST Section, North Carolina Department of
Environment and Natural Resources, Division of Waste Management, July 2008.
NCDENR, 201 la. Notice oj' Regulaton, Requirements, ISA NCAC 2L .0407(c), Risk -based
Assessment and Corrective Action for Petroleum Underground Storage Tanks,
Knollwood Gulf Station (BP 24163), 381 Knollwood Street, Forsyth County. North
Carolina Department of Environment and Natural Resources, Division of Waste
Management — UST Section, Winston-Salem Regional Office. October 27, 2011.
NCDENR, 2011b, Ref; Issuance of Injection Permit WI0400198, Former Knollwood Gulf
Station (BP 24163), Winston-Salem, Forsyth County, North Carolina. North Carolina
Department of Environment and Natural Resources, Division of Water Quality. August 9,
2011.
NCDENR, 2013. Ref Renewal Issuance of Injection Permit WI0400198, Former Knollwood
Gulf Station (BP 24163). Winston-Salem, Forsyth County, North Carolina. North
Carolina Department of Environment and Natural Resources, Division of Water Quality.
May 24, 2013.
URS, 2011. Corrective Action Plan, Former Knollwood Gulf Station (BP 24163), Incident No.
6400, 381 Knollwood Street, Winston-Salem, North Carolina. URS Corporation — North
Carolina. September 7, 2011.
URS, 2012a. RE: Injection Pilot Test and Additional Investigation Results. Letter Report
Submitted to Thomas Moore, North Carolina Department of Environment and Natural
Resources, Division of Waste Management — UST Section. URS Corporation -North
Carolina. April 23, 2012.
URS, 2012b. Activated Sodium Persfulate Injection Completion Report, Former Knollwood Gulf
Station (BP 24163), 381 Knollwood Street, Winston-Salem, Forsyth County, North
Carolina, Incident No.: 6400. URS Corporation -North Carolina. December 5, 2011
URS, 2013a. RE: Injection Permit WI0400198 Renewal Application, Former Knollwood Gulf
Station (BP 24163), 381 Knollwood Street, Winston-Salem, NC. Submitted to North
Carolina Department of Environment and Natural Resources, Division of Water Quality.
URS Corporation -North Carolina. March 26, 2013.
URS, 2013b. Semiannual Data Report, Former Knollwood Gulf Station (BP 24163), 381
Knollwood Street, Winston-Salem, Forsyth County, North Carolina, Incident No.: 6400.
URS Corporation -North Carolina. April 30, 2013.
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SECTIRNSIX REFERENCES
URS, 2013c. RE: Injection Event Record, Injection Completed Under Injection Permit
WI0400198, Former Knollwood Gulf Station (BP 24163), 381 Knollwood Street,
Winston-Salem, NC Submitted to North Carolina Department of Environment and
Natural Resources, Division of Water Quality. URS Corporation -North Carolina.
June 26, 2013.
URS, 2013d. RE: Quarterly Status Report, Former Knollwood Gulf Station (BP 24163). 381
Knollwood Street, Winston-Salem, NC Submitted to North Carolina Department of
Environment and Natural Resources, Division of Water Quality. URS Corporation -North
Carolina. August 8, 2013.
USEPA, 2008. USEPA Contract Laboratory Program National Functional Guidelines for
Superfund Organic Methods Data Review, U.S. Environmental Protection Agency Office
of Superfund Remediation and Technology Innovation. USEPA-540-R-08-01. June 2008.
USEPA, 2010. USEPA Contract Laboratory Program National Functional Guidelines for
Inorganic Superfund Data Review, U.S. Environmental Protection Agency Office of
Superfund Remediation and Technology Innovation. EPA 540-R-10-011. January 2010.
Vironex, 2013_ Injection Services Report, Prepared for: URS, Prepared by: Vironex, Former BP
Station No. 24163, Winston Salem, NC, June 3. 2013 — June 6, 2013. Submitted to URS
June 20, 2013. Vironex, Inc.
YSI, 2009. The Dissolved O;ggen Handbook W39 0909. September 2009. YSI Incorporated.
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TABLES

Table 1
Monitoring Well Construction Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
wen
Status
Well
Type
TDC
Elevation'"'
Total
De th'l1
Well
@iarneler I inch"i
scrern
lnler val '''
Avg Screen
Elevation'j'
MW-3
In Use
Type 11
99,03
21)
2
NA NA
NA
MW-5
Abandoned
Type 11
99.39
25.5
4
10,5 25.5
81.4
MW-5R
In Use
Type 11
NS
20
2
10 20
NA
MW-6
In Use
Type if
98.68
25.5
4
10.5 25.5
80.7
MW-!ri
In Use
Type Elf
99.26
55
2
50 55
46.8
MW-8
Abandoned
Type 11
97.84
14
r,
NA NA
NA
MW-8R
In Use
Type II
NS
20
2
10 - 20
NA
M'a _ 14
In Use
Type if
100.44
22
4
7 22
85.9
MW-I5
In Use
Type 11
99.91
22
4
7 - 22
85.4
MW-16
In Use
Type 11
97.42
25
2
10 - 25
79.9
MW-17
In Use
Type 11
100.00
22
4
7 - 22
85.5
MW-18
In Use
Type 11
NS
20
2
10 - 20
NA
MW-19
In Use
Type 1I
NS
20
2
10 - 20
NA
Notes:
l . Reported in feet below grade
2. Measured in feet relative to site datum
4. Conestoga Rover and Associates. a farmer consultant for this Site. previously reported that no reference was found to the fallowing wells:
MW-1. MW-9. MW-10. MW-11, MW-12 or MW-13. These wells are presumed to be abandoned.
3. URS Corporation is not responsible for data generated by others, Data included on this table not generated by
or on behalf of URS Corporation - North Carolina {URS} has been taken from documents prepared and submitted to the NC DEN by Others and
is included only For ease of reference; URS does not assume or accept any responsibility or liability for the quality. accuracy. or completeness of
the data included on this table that was not generated by or on behalf of URS,
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. 201 1.
NA = Not Applicable 1 Available
NS = Not Surveved
TOC = Top of Casing
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Table 2
Stinunary of August 28, 2a13 Groundwater Results
Com pared to NC Gross Contamination Levels
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, NC
Sample ID:
MW-03
MW-05R
MW-118R
MW-18
MW-19
Parameters
Collection Date:
Standard Units
812812013
812812013
8/28/2013
812812013
W2812613
VOC
Benzene
5000 01
ugll
3.6
161
1,600
182
2,710 J
Toluene
260000 Gl
ug/I
.12 J
489
5,390
730
13,100
Eth lbenzcne
84500 G1
um
J3
178
628
368
1.190 J
X lenes (Total)
85500 G1
ugA
.31 I
1.380
3.990
1.660
7.420 7
Methyl tert-but I ethcr
20000 G1
u!A
103
417
1,380
139
3.240 ] �
Other
Carbon dinxide
I mgll
457
1.590
703
2.230
525 f
5ulfatc
mg11
21.9
13.90t1
4.770
7.850 i
2,660
Notes:
G I - lNC Gross Contamination Levels
µglL - Micrograms per Liter
mg1L - Milligrams per Liter
J - Estimated value
VOC - Volatile organic compounds
This table presents the results of all analytes. Sample results have been qualified by URS based on the results of the data review process. which is modeled after the USEPA Contracr1 Laboratory Program (CLP)
National Functional Guidelines (NFG) for Superftnd Organic Methods Data Review (EPA, June 200) and USEPA CLP NFG far Inorganic Superfund Data Review (USEPA, Januarr 201 t1)-
Gross Contamination Levels, effective April 16, 2012. obtained from the NCDEN R. ❑ivision of Waste Management. UST Section. A bold border indicates the concentration is greater than the NC Gross
Contamination Level.
ClEnvi*o Datai R1 10/4/2013 5:07-01 PM Page: I / 1

Table 3
Groundwater Field Parameter Results, August 28, 2013
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
Specific
pH
ORP
Temperature
DO
Well
Conductance
(s.u.)
(mV)
°C
OnSlcm)
(mglL)
MW-3
6.65
-21.3
22.43
0.855
1.93
MW-5R
11,42
165.1
22.12
29.66
3.01
MW-8R
9.10
173.2
21.96
14.13
3.15
MW-18
9.06
219.9
21.71
16.08
1.79
MW-19
6.20
213.1
21.16
5.29
3.30
Notes:
❑RP - oxidation-reduction potential
DO - dissolved oxygen
s.u. - standard units
mV - millivolts
GC - degrees Celsius
mS/cm - miIIiSiemens per centimeter
mg/L - milligrams per liter
T gir�Ery[.wweti+sin�, [•K. w %. +!I I rxan I— IhlnmMnN 24MI N1T Gw i I 1 of i

FIGURES

"RT-Ag
9

+MW-17
MW-3* I
MW- 1$+
MW-5R*
�MW-SR
MW-6��
MW-19
MW-6
MW-14
y
1
LEGEND
PROPERTY LINE
ABANDONED GROUNDWATER
MONITORING WELL
FORMER PRODUCT LINE
caa
CATCH BASIN N
a ""
MAN HOLE
AREA LIGHT
• MR.UTILITY
POLE
FIRE HYDRANT
n '
TELEPHONE
LARGE MANHOLE COVER
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.
0 30
APPROX, SCALE, ft.

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
TOC
Depth to
Depth to
I.NAPL
Corrected
►yeN
Date
Elevation
LNAPL
Groundwater
Thickness
Groundwater
(1)
(feet htoc)
(feet btoc)
(feet)
Elevation(1)(2)
06/24/93
ND
13.89
0.00
85.14
08/23/94
ND
14.36
0.00
84.67
03121/95
N❑
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
N❑
14.41
0.00
84.62
12/27/01
ND
14.51
0.00
84.52
03/05/02
ND
14.29
0.00
$4.74
05/13/03
ND
14.35
0A0
84.68
12/09/03
ND
13.63
0.00
85.40
03/2366
ND
13.64
0.00
85.39
MNk-1
05/08/07
99.03
ND
13.40
0.00
85.63
05/14M
ND
13.42
0.00
85.61
05/2"
ND
13.31
0.00
95,72
05/27/10
ND
13.07
0.00
85.96
10/31 /1 1
ND
13.87
0.00
85.16
05122/12
ND
13.55
0.00
95.48
06/14/12
ND
13.53
0.00
95.50
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
14A2
0.00
84.61
02C26113
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
85A6
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
85.95
11/17/98
ND
14.08
0.00
85.31
06/19/01
NM
NM
NM
NM
09/12/0)
ND
14.46
0.00
84.93
711 5
12/27/01
y`�- `�
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
13.44
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/Z2112
ND
13.66
O.DO
NM
06/14/12
ND
13.73
0.00
NM
07/09/12
NS
ND
14.18
0.00
NM
MW-5R
08/14/12
ND
14.4,,
0.00
NM
09/19/12
ND
14.35
0.D0
NM
12/05/12
ND
14.68
0.00
NM
02/26/13
ND
13.89
0.00
NM
05/31/13
N❑
13.77
0.D(1
NM
08/28/13
ND
13.83
0.00
1 NM
Pseew weviini rt w S. 191x. ►. Nd s i s o [*r .Warn 1 D-n 1- �. n.i col= aw ¢ �i p. p vR m r.n�. TNk.. yq uxlrr . u r .ds. idy EAm A I inNMw w+i AM 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
TQC
Depth to
Depth to
LNAPL
Corrected
Well
Date
Elevation
LNAPL
Groundwater
Thickness
Groundwater
(l)
(feet htoc)
(Feet htoc)
(feet)
Elevation (1)(2)
06/24/93
ND
12.31
0.00
86.37
*
08/23/94
ND
12.61
0.00
86.07
03/21195
Nil
13.15
0.00
85.53
'
0810519f)
ND
12,39
0.00
86.29
*
1 111719s
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
OM
85.07
03/05/02
ND
11,02
0.00
87.66
05/12/03
ND
11.10
0.00
87.58
12/09/03
ND
13.49
0.00
85.19
03/23M6
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
06/24/93
ND
NM
OM
NM
08/23/94
ND
NM
0.00
NM
03121/95
ND
14.75
0.00
84.51
MOM
ND
14.13
0.00
85.13
11/17/98
ND
14.09
0.00
85.17
06/19/01
ND
18.07
ODD
81.19
09/12/01
ND
16.60
0.00
82.66
12/27/01
ND
14.61
0.00
84.65
MW-6i
03/05/02
99.26
ND
14.96
0.00
84.30
05/12/03
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
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
*
06/19/0)
NM
NM
NM
NM
09/12/01
ND
12.67
0.00
85.17
121271U1
14.47
15.03
0.56
93.26
MW_8
, ,
*
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
03123/06
ND
12.15
0.00
85.69
051MS107
ND
11.90
0.00
85.94
05/14/08
ND
11.95
0.00
85A9
05/28/09
ND
11.70
0.00
86.14
P,B"V ra %KCW 141. ['►. W.5- Saj X b1 j Str Lr 5 0 Dtk­bm.%5 1 DVIh I.- D .w N1 mi za 0 uw u- q. t. Aq.mi %bVF*b Ag�- . ix*il pI IRei M ftr. k IAppA, I tf b D11941 AM Page 2 of 3

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
Li eli
Date
Ele�atinn
LNAPL
Groundwater
Thickness
Groundwater
11 i
[feet 6toc]
(feet htoc)
feet
Elevation (1)(2)
05/27/10
ND
1197
0.0O
NM
10/31/11
NO
13.34
0.00
NM
05/22/12
ND
13.69
0.00
NM
06/14/12
NO
14.94
0.00
NM
07/09/12
ND
14.08
0.00
NM
1y
MW-RR
08/14/12
ND
14.29
0.00
NM
091191I2
ND
14.08
0.00
NM
12MS/l2
ND
14.53
0.00
NM
02126/13
ND
13.80
0.00
NM
05/31/13
ND
13.61
0.00
NM
08/28/13
ND
13.74
0.00
NM
06124193
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
I :.I fi
0.00
86.18
06119M]
ND
14.55
0.00
25.89
09/12/01
NO
14.8 i
0.00
85.63
12/27/01
NO
14.85
0.00
85.59
MW-14
03/05/02
100.44
ND
14.64
GAO
95.80
05/12/03
NO
13.41
0.00
87.03
12/09/03
NO
13.51
0.00
86,93
03/23/06
ND
13.82
0.00
86.62
05/08/07
NO
13.54
0.00
86.90
05/14/08
NO
13.64
0.00
86.80
05/28/09
NO
13.47
0.00
86.97
05/27/10
NO
13.00
0.00
87.44
10/13/11
NO
14.14
0A0
86.30
06/24/93
NM
NM
NM
NM
OM3194
NM
NM
NM
NM
03/21/95
NO
12.83
0.00
87.08
08/05/96
NO
12.77
0.00
87.14
11/17/98
N❑
13,58
0.00
86.33
06/19/01
NO
13.80
0.00
86.11
09/12/01
ND
14.18
0.00
85.73
12/27/01
ND
14.29
0.00
95.62
7111 -1 5
03/05/02
ND
13.98
0.00
85.93
05/12/03
NM
12.75
NM
87.16
12/09/03
NO
12.89
0.00
87.02
03/23/06
NO
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
NO
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
r .M%M,, „ . 1% :+I61. px W-5. 311 K.A.-d _% . a Dµb . „s I rr . I_ pkl.nN4!.0:a M, NIP VW P...ro kW. Ih Pcpwrt.er,,TAn . npp�d ❑r to A I11W f W Ek-r CAM Ai i 1PW2-?j3Y 4i AM Page 3 of 5

Appendix A
Nistorical 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
LNAPt,
Groundwater
Thickness
Groundwater
11
(feet htocl
(feet btor]
(feet)
Elevation (1)(2)
06/24/93
NM
NM
NM
NM
08/23194
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
09A 2101
ND
12.98
O.t70
84.44
12r27/01
NM
NM
NM
NM
MW.16
OM05/02
97.42
ND
12.83
0.00
84.59
05/12/03
NM
NM
NM
NM
12/09/03
ND
1113
0.00
85.29
03/23/06
ND
12.18
0.00
85.24
05/08/07
NM
NM
NM
NM
05A4/08
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
06/24/93
NM
NM
NM
NM
08/23/94
NM
NM
NM
NM
D3i21/95
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
ON19/01
ND
15.03
0.00
84.97
09/12/01
ND
15.28
0.00
8C72
12/27/01
ND
15.37
0.00
84.63
MW-17
03/05/02
MOM
ND
15.15
0.00
84.85
05/12/03
NM
14.15
NM
85.85
12/09/03
ND
14.50
0.00
85.50
03123/06
ND
14A5
0.00
85.55
05/08/07
ND
14.22
0.00
85.78
05/14/08
ND
14.22
0.00
85.78
051281{}9
ND
14.12
0.00
85.88
05/27/10
ND
13.90
0.00
MAO
l0/31/11
ND
14.72
0.00
85.29
10/31/11
ND
13.95
0.00
NM
05/22A 2
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
15
ND
14.43
0.00
NM
MW 18
09/19/12
ND
14.34
0.00
NM
I V05112
ND
14.62
0.00
NM
02/26/13
N❑
I C67
0.00
NM
05/31/13
ND
14.57
0.00
NM
08/28/13
N❑
14.33
0.00
NM
P IBPIProl ft-cob?? rx. A 4, 381 I(e+r. d Soee c b�bmhF.15 1 D-N 1-� [kpelaA •+A.j _013 0W Z: a [jhiy An--" a. awl LkArn- rd. I rHo-, DW Fi. IA* A11ICy 119Ai AN Page 4 of 5

Appendix A
Historical Groundwater Elevation Data
Former BP Service Station No. 24163
381 Knoliwood Street
Winston-Salem, Forsyth County, North Carolina
Well
Date
TOC
Elevation
(1)
depth to
LNAPL
(feet btoc)
Depth to
Groundwater
]feet btoc)
LNAPL
Thickness
(Feet)
Corrected
Groundwater
Elevation (1)(2)
10/31/11
ND
13.75
OM
NM
05/22/12
ND
13.37
0.00
NM
06/14/12
ND
13.39
OM
NM
07/09/12
N❑
13.89
0.00
NM
08/14/12
NS
ND
14,13
0.00
NM
MW • 19
0911 Wl2
ND
14.02
0.00
NM
12105112
ND
14.39
0.00
NM
02/26/13
ND
13.62
0.00
Niel
05/31/13
ND
13.47
0.00
NM
OVUM
ND
13.56
0.00
NM
N001
1. Measured in feet relative to site datum
2. Corr. GW Elev. = (ref. point elevation} - (depth to groundwater) + (LNAPL thickness)(t.NAPL specific gravity)
3. LNAPL specific gravity ",auned to he 0.73
• - Prior to URS' work at this Site, monitoring wet] 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.
- URS Conpuratiou is not responsibte For data generated by others. Data included on this table not generated by or on behalf of URS Corpotation - North
Carolina (URS) has been taken From ducuments prepared and submitted to the NCDENR by others and is included only for ease of referece; URS does not
amitune or accept any responsibility or liability for the quality, accuracy. or completeness of the data incWed on this table that was not generated by or on behalf
of URS.
LNAPL = Light own -aqueous phase liquid
ND = Not detected
NM = Not measured
NS = Not Surveyed
TOC = Top of casing
bloc = below top of racing
• During the May 2003 sampling event LNAPL was observed in MW-5. Depth to groundwater and thickness of LNAPL were not measured.
P IBW'nnm UdO_'4W. (X WA 341 K.oM. d Suatil oeYreubM'•5 I D., I- D,6mN 4 `4 Ag ]PI. nW It— V.4 t- I W.I UW rS A"AL I d x o1:V 41 nM Page 5 of 5

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APPENDIX G
HISTORICAL GROUNDWATER ANALYTICAL SUMMARY

Appendix C
Historical Groundwater Analytical Summary
Former HP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Caroling
Well
Sample date
Benzene
Eth} I
benzene
Toluene
XylenesgOO
Total
Sulfate
Carbon
dioxide
NC GCL:
5,000
94.500
260.000
85.500
NE
NE
Units:
11
!
m A
m
MW-03
5/13/2003
9-5
0-981
0.611
1.71
12/912003
47.4
14.3
1.9 1
8.1
37.3
3123120D6
45 J
< 0.5
< 0.5 Ul
r I U1
5.5
5/8/2007
40.4
3.7
1.4
21
13.I
5114/2008
4.3)
[ 0.8
C 0.7
¢ 0.8
14
5/28/2009
5.4
0.441
0.14 J
0.491
5.6
5/27/2010
0.44 J
¢ 0.1 1
0.3 1
¢ 0.32
4.8
10/31/2011
5.5
0.76
¢ 0.17 U1
0.38)
19.1 1
8.4
405
5/22/2012
< 0,43 U
< 0.2
< 0.2
r 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
"
1-6
2.6
3
14.7
9.9
393
8/14/2012
2
2.1
< 0.13
0.4 J
l 7.9
3.6
303
9/19/2012
2.7
0.66
< 0.13
0.33 J
19.8
2.9
459
12/5/2012
113
1-2
0,43 J
1-1 J
19.3
0.78 J
377
2/26/2013
0.23 J
c 0.1
[ 0.1
[ 0.22
5A
32.6
338
5/31/2013
0.321
< 0,1
¢ 0.1
[ 0,22
10.5
17.9
334
8128/2013
3.6
0,53
0.123
0.31 J
10.3
2 I .11
45-
M1V i1;
3/23/2006
11700
2.440
32,D00
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
51812D07'''
7,4{H)
1.680
20.1(X}
9,290
9.360
5/14/2008
10.000
2.100
29.000
12.000
18.000
5/1412008'''
10,000
2.100
30,000
12,000
18.000
5/28/2009
7,390
2,330
25,700
13.400
6,920
5128120091
6,510
2,240
22,100
12,900
6,510
MW-05R
5/27/2010
6.610
2,810
24,300)
15.7D0
4.330
512712D 10 "'
1 6,090
2,380
30,100 J
13.300
4,250
1013112011
7.960
2.660
28.000
13,800
3,830
< I
< 5
10/31/2011 '"1
8,360
2,970
24,600
14,800
4,070
--
5/22/2012
7,980
3.470
32,200
19.200
3,820
< 5
179
611512012'2'
24-1
227
1.190
1,120
36.9
6,070
1,820
7/9/2012
3361
4811
2,0101
2.400)
48A J
6,470
1620
8/14/2012
201
283
1,050
1,300
48.5
14300
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
1 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
81M812013
165
178
489
1.380
417
13,900
1.590
MW-06
5/12/2003
< 0.5
0.52 J
< 0.5
< 1
3
--
12/9/2003
2.3
0.64 J
l .1
3.6
17.6
12/9/2003
2A
0.681
1,1
3.8
18
3/23/2006
0.76)
0.59 J
3.6
2.8 J
IA
5/8/2007
< 0.5
< 0.5
< 0.5
< 1
< 0.5
-
511412[}O8
¢ 0.5
< 0.8
¢ 0.7
< 0A
< 0 5
5/28/2009
< 0,06
c 0.05
< 0.06
[ 0.14
0.17 J
5/27/2010
< 0.1 1
0.13 J
0,381
0.46 J
< 0.12
10/31/2011
8.71
11.71
27.5 J
l 32 J
< 0.26 UJ
131
2,130
P ePrPi-O*M+N024163. C% W S. 381 KhOIN -d S:feerA 0 Silo gala 4 6 Analyrical TanimSP 24163 W ater H•slwi ' and mleco on Manowfig Summary r12-1420331
1200+2o1 S. 4:11 PM

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
Carbon
dioxide
NC GCI.:
5,OW
84,500
260,000
85,500
20,000
NE
NE
Units-.
WIIpgA
mgl
m tl
MW-061
5/1212003
¢0.5
a0.5
<0.5
I.II
r0.5
12/9/2003
1 ¢ 2.5
< 2.5
¢ 2.5
1 ¢ 5
< 2.5
--
3/23/2006
49.7
18.9
4K7
443
3.560
5/812007
a 25
r 25
¢ _25
< 50
6,9 i0
511412008
5.21
< 2
< 1.9
¢ 2
3,400
5/28/2009
2.5
< 0,05
r 0.06
< 0.14
1,150
5/27/2010
l .6 J
< 1.1
c 1. l
¢ 3.2
492
10131 /201 l
0,41 J
< 0.36
< 0.32
¢ 0.75
122
c. 1
11.1
MW-08
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-08R
5/27/2010
8,570
2,870
31.700
15,700
6,260
10/311201 l
8,000
3,180
32,100
17,200
3,170
< 1
< 5
5/22/2012
8,270
3,360
36,400 J
1.7,800
3,920
< 5
119
611512012 1zi
726
47 J
760
2421
96.3 J
4,760
22,200
719/2012
4,540 J
t,870 J
17,100 J
10,800 J
1,530 J
6,570
4.500
S114/2012
4370
1,610
19,300
8,780
2.000
7,010
1,560
9/19/2012
4,780
1,800
20,900
10,400
2,600
6.700
1.100
12/5/2012
7,760
2,440
31,900
13,800
4,560
2,410
635
2/26/2013
7,310
2,480
30,500
13.400
4,530
959
590
5/31/2013
6,540
3,040
30,500
12.500
4.200
439
437
8/28/2013
1,600
628
5.390
3,990
1,380
4.770
703
MW-14
5/12/2003
¢ 0-5
¢ 0,5
¢ 0.5
¢ 1
0,521
--
--
121912003
<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
-
5/14/2008
< 0-5
< 0.8
¢ 0.7
¢ 0.8
< 0.5
5/28/2009
¢ 6.06
< 0.05
0,0771
< O. [ 4
< 0.06
5/27/2010
¢ 0,11
< 0.11
¢ 0.11
< 0.32
¢ 0.12
--
1013112011
¢0,13
r0.15
¢0.42U
<0.3
<0.13
43.2
<5
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
2.2J
r0.5
-
5/14/2008
< 0.5
< 0.8
< 0-7
3.7 J
< 0.5
5/27/2010
¢0.11
r0.11
C0.11
r0.32
C0.12
--
10/31/2011
1 ¢0.13
<0.15
¢0,13
¢0.3
¢0.13
¢ I
MW-16
3/23/2006
< 2.5
90.8
15.8
836
2.81
5/14/2008
<0.5
160
15
1,600
4.11
5/27/2010
3.6
54.7 J
5.1
525 J
1.3
--
10/31/2011
r 0,65
17.2
¢ 1.4 U
321
¢ 0.65
1 194
r
17
5/13/2003
57.7
< 0.5
< 0.5
< 1
69
5/13/2003
40.8
c 0.5
¢ 0.5
r 1
63.3
12/9/2003
6.6
0,651
< 0.5
< 1
80.6
312N2006
I
< 0.5
¢ 0.5
< 1
58.9
5/8/2007
<0.5
<0.5
[O.5
¢ 1
17.4
5/14/2008
3.7 J
< 0.8
r 0.7
< 0.8
19
--
5/28/2009
7
¢ 0.05
0.076 J
< 0.14
14.5
5/27/2010
5.7
¢ 0.1 i
I < 0.11
[ 0.32
]1,4
1013I1201 l 1
0.51 1
0.16 J<
0.81 U1
0-57 J
8-9
< 1
4
PZPsProJpcle MA163, CK WS, 301 KfbD1Pw d Stleal%A 0 Site Dafa+A.6 AnWic, 1'Iavn&%SP 241 fi.3 - Waler - Hvonnl am Iryecnon Mon, 1DnW Summary 112-10.20131
1211 N2e 13. 4:11 PM

Appendix C
Historical Groundwater Analytical Summary
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
«ell
Sample Date
Benzene
!Ethyl
benzene
Toluene
Xylenes
{Total
NITBE
Sulfate
Carbon
dioxide
NC GCL:
5.000
84,500
260,0[)t)
85,500
20,000
NE
NE
Units
1
m
m
MW-18
10/31/2011
3340
998
1 1. l00
8,950
1.140
8.2
446
5/22/2012
2,280
2,790L2214,400
12,000
789
< 5
307
611512012 t'-'
373
910
3,910
114
10.600
3,410
7!9l2012
1,730 J
1,1701
9,750 J
676 J
2,300
835
8/14/2012
3,020
2,990
12.800
1,090
758
580
4119M12
3,190
3,090
14,000
1,240
322
542
l21512012
3,370
2,970
11800
1.390
32.2
436
2/26/2013
2,510
2,970
10.100
8,690
1,140
13.8
500
5/31/2013
2,780
3.070
8,210
5.740
1,000
83.3
475
9/28/2013
182
368
730
1.660
139
7,850
2.230
MW-19
10/31/2011
2,390
1.380
8,790
7.040
5,166
3.7
425
5/22/2012
2,700
1,560
14,200
7,940
4,880
< 5
310
6115/201?'-'
4.020
1,440
18200
7,940
3,290
1.090
1 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
M612013
2,210
1.110
10.600
6.990
3.
1
3
5/31/2013
1.930
894
9,820
5.250
3,
1,530
65006
2,71❑J
1,190 !
13.1OD
7,420!
3,240 1
2,668l2812013
525
ti UtCs:
Field duplicate
Alkalinity, sulfate. and carbon dioxide samples were collected 6/14/2012 and volatile organic analysis samples
were collected 61I5112.
- " - Not sampled or analyzed
- Not detected at the specified detection limit
pSA - Micrograms per Liter
GCL - Gross Contamination Level
J - Estimated value
mgll - Milligrams per Liter
MTBE - Methyl teri-butyl Ether
NE - Not established
tJ - Nut present above the associated level. blank contamination exists
t7J - Not detected and the detection limit is estimated
Bold cell with a green highlight indicates GCL exceedance.
Activated sodium persulfate injections were performed at the site Irvin June 4. 2012. to June 9, 2012. and From
June 3, 2013, to June 6, 2013,
This table presents the results of all analytes- Sample results have been qualified by URS based on the results of
the data review process, which is modeled after the USEPPA Contract Iaborurory Program [CLP) National
Ftarctionul Guidelines (NFG) for Sleperfuud ❑rganic Methods Data Revirsv {EPA, June 2008) and USEPA CLP
NFG for Irrorganic Superf ind Data Review (USEPA, January 2010).
Gross Contamination Levels, effertive April 16. 2012. obtained from the NCDENR, Division of Waste
Management, UST Section_
P'.9PYPro*C S CG 241r,3. CK. W •5..3$7 KROIIYYpo0 Sn"M p S,Ie DatWA.5 A,W,CBNTO"65'8P fA1b:i Wa!er Nistoeltdl d�tl InIbCUOn MonrtpRnp S4mttuvy {12-10-701a)
12110f2013, 491 PM

APPEN❑IX ❑
LABORATORY ANALYTICAL REPORT

e-Hardeopy 2 0
Aultmtrared Rcnorl
■ Southeast
.4CCUTEST
LA UUFrATORIES mmaw
Technical Report for
Atlantic Richfield Company
URSNCM:SIS 24163. 381 Knollwood St, Winston-Salem, NC
38436760
Accutest Job Number: FA7708
Sampling Date: 08/28/13
Report to:
URS Corporation
martha. meyers-lee@urs. com
TTN: Martha Meyers
Total number of pages in report: 32
i
Test results contained within this data package meet the requirements garrygBellizadi. Ph.D.
of the National Environmental Laboratory Accreditation Conference Laboratory Director
and/or state specific certification programs as applicable.
CIient Service contact: Heather Wandrey 407-425-6700
Certifications: FL (E83510), LA (03051), KS (E-10327), IA (366). IL (200063), NC (573). N] (FL002). SC (96038001)
Dol) ELAP (L-A-13 L2229), CA (04226CA), TX (T104704404), AK, AR. GA, KY. MA, NV, OK, UT, VA. WA, WI
This report shall not be reproduced, except in its entirety, without the written approval of Accutest Laboratories.
Test results relate only to samples analyzed.
Sout Iteast ° 4405 Vineland Road ° Suite C-15 - Orlando. FL 32811 • tel: [phone] ° fax: [phone]
Accutest Laboratories is the sole authority for authorising edits or modifications to this
document. Unauthorized modification of this report is strictly prohibited.
- hupwwww.accutest.com
ME 'I of 32
M,&,MM JTES-r
FA7708

Sections:
Table of Contents
-l-
Section 2:Case Narrative/Conformance Summary ..............................................................
4
Soctiom3- Summary wKUUAks............. .......................... --- ............. .......................................
6
Section 4: Sample Remults.........,...~......~..~..................~.............~..~..~..~.~....~...~.......~......
8
4.1:FA7708-1: TRIP BLANK .............................................................................................
9
4.2: FA7708-2: MW-3 .—.--.--.....~...-........-.............—..........'.......-.—..
O
4-3:FA7708-3: MW-5R.......................................................................................................
12
4.4:FA7708-4: MW-8R.......................................................................................................
14
4.5:IA7700-5.- MW-l8........................................................................................................
16
4.6:FA7708-6: MW-}9........................................................................................................
18
Section 5:Misc. Forms ............................................................................................................
20
5.1:Chain of Custody .---.—_-.--.—.----.—._—__—.—__-.---_.--_
21
Section h:GUMS VolatUem-QCData Summaries ..............................................................
24
6.U:Method Blank Summary ........................................... ................................ ................
25
6.2:IBlmzk Spike Summary ------------_.—__—___--.----__-_---
26
6-3:Matrix Spike/Matrix Spike Duplicate Summary ...........................................................
27
Section 7:General Chemistry -QC Data Summaries ~~~~~...~~~...........,.~..
28
7.1:Method Blank and Spike Results Summary ..................................................................
29
7.2: Duplicate Results Summary -----.--.----.—.--.---.—.---------.
30
7.3:Mmbtx Spike Results Summary ........................................... .........................................
31

Accutest LabLink@09:19 12-Sep-2013
Sample Summary
Atlantic Richfield Company
Job No: FA7708
URSNCM:SIS 24163. 381 Knollwood St, Winston-Salem, NC
Project No: 38436760
Sample Collected Matr ix Client
Number Date Time By Received Code Type Sample ID
FA7708-1 08/28/13 00:00 SH 08/29/13 AQ Trip Blank Water TRIP BLANK
FA7708-2 08/28/13 09:55 SH 08/29/13 AQ Ground Water MW-3
FA7708-3 08/28/13 10:25 SH 08/29/13 AQ Ground Water MW-5R
FA7708-4 08/28/13 10:50 SH 08/29/13 AQ Ground Water MW-8R
FA7708-5 08/28/13 09:00 SH 08/29/13 AQ Ground Water MW-18
FA7708-6 08/28/13 09:35 SH 08/29/13 AQ Ground Water MW-19
EM 3 of 32
■.4ccuTEST
FA7708 "." 1 °

SAMPLE DELIVERY GROUP CASE NARRATIVE
Client: Atlantic Richfield Company Job No: FA7708
Site: URSNCM:SIS 24163: 381 !{nollwood St, Winston-Salem, NC Report Date 9/12/2013 9:13: l6 AM
5 Samples and 1 Trip Blank were collected on 08/28/2013 and were received at Accutest SE on 08/29/2013 properly preserved, at 2.8
Deg. C and intact. These Samples received an Accutestjob number of FA7708. A listing of the Laboratory Sample ID, Client
Sample ID and dates of collection are presented in the Results Summary Section of this report.
Except as noted below, all method specified calibrations and quality control performance criteria were met for this job. For more
information, please refer to QC summary pages.
Volatiles by GCMS By Method 5M 6200B
Matrix: AQ Batch ID: VA1327
All samples were analyzed within the recommended method holding time.
All method blanks for this batch meet method specific criteria.
Sample(sj FA7708-6MS, FA7708-6MSD were used as the QC samples indicated.
Matrix Spike Recovery(s) for Toluene are outside control limits. Outside control limits due to high level in sample relative to
spike amount.
Matrix Spike Duplicate Recovery(s) for Xylene (total) are outside control limits. Probable cause is due to matrix interference. For
method performance in a clean matrix, refer to Blank Spike.
RPD(s) for M S D for Benzene, Ethylbenzerie, Methyl Tert Butyl Ether, Xylcnc (total) are outside control limits for sample
FA7708-6MSD. Probable cause is due to sample non -homogeneity.
FA7708-3: Sample was not preserved to a pig < 2,
FA7708-4: Sample was not preserved to a pH < 2.
FA7708-5: Sample was not preserved to a pH < 2.
Wet Chemistry By Method EPA 3001SW846 9056A
Matrix: AQ Batch ID: GP22434
All samples were prepped within the recommended method holding time.
All samples were analyzed within the recommended method holding time.
All method blanks for this batch meet method specific criteria.
Sample(s) FA7774-3MS, FA7774-3MSD were used as the QC samples for Sulfate.
Wet Chemistry By Method SM19 2320E
Matrix: AQ Batch tD: GN57627
All samples were analyzed within the recommended method holding time.
All method blanks for this batch meet method specific criteria.
Sample(s) FA7708-2DUP was used as the QC samples for Alkalinity. Total as CaCO3.
Matrix: AQ Batch ID: GN57634
All samples were analyzed within the recommended method holding time.
All method blanks for this batch meet method specific criteria.
Samples) FA7621-1DUP was used as the QC samples for Alkalinity, Total as CaCO3,
Thursday, September 12, 2013 Page I of 2
■■ 4 of 32
� ACCIJTESY.
FAM11 •"°"• °•

Accutest Laboratories Southeast ALSE certifies that this report meets the project requirements for analytical data traduced for the
(ALSE) Pn P 1 q Y P
samples as received at ALSE and as stated on the COC. ALSE certifies that the data meets the Data Quality Objectives for precision,
accuracy and completeness as specified in the ALSE Quality Manual except as noted above. This report is to be used in its entirety.
ALSE is not responsiblc for any assumptions of data quality if partial data packages are used
Narrative prepared by:
Lovelie Metzgar, QA Officer (signature on file)
Thursday, September 12, 2013
Date: September 12, 2013
Page 2 of 2
an 5 of 32
N .4CCUTEt3T.
Fa77o9 •••a••••�•••

Summary of Hits Page I of Z
Job Number: FA7708
Account: Atlantic Richfield Company
Project: URSNCM:SIS 24163. 381 Knollwaad St, Winston-Salem, NC
Collected: 08/28/13 ra
Lab Sample ID Client Sample ID Result/
Analyte Qua[ RL MDL Units Method
FA7708-1 TRIP BLANK
No hits reported in this sample.
FA7708-2 MW-3
Benzene
3.6
0.50
0.10
ugll
SM 6200B
Toluene
0.12 j
0.50
0.10
ugll
SM 6200B
Ethylbenzene
0.53
0.50
0.10
ugll
SM 6200B
Xylene {(otal)
0.31 j
1.5
0.22
ugll
SM 6200B
Methyl Teri Butyl Ether
10.3
0.50
0.10
ugll
SM 6200B
Alkalinity, Total as CaCO3
377
5.0
0.60
mg/1
SM19 2320E
Carbon Dioxide
457
5.0
5.0
mgll
SM19 45000O2D
Sulfate
21.9
10
3.0
mgll
EPA 3001SW846 9056A
FA7708-3 MW-SR
Benzene
165
5.0
1.0
ugll
SM 6200B
Toluene
489
5.0
1.0
ugll
SM 6200B
Ethylbenzene
178
5.0
1.0
ugll
SM 6200B
Xylene (total)
1380
15
2.2
ugll
SM 6200B
Methyl Teri Butyl Ether 3
417
100
20
ugll
SM 6200B
Alkalinity. Total as CaCO3
3590
25
3.0
mgll
SM19 2320B
Carbon Dioxide
1590
5.0
5.0
mgll
SM19 45000O2D
Sulfate
13900
1000
300
mg1I
EPA 3001SW846 9056A
FA7708-4 MW-8R
Benzene a
1600
100
20
ugll
SM 6200B
Toluene a
5390
100
20
ugfl
SM 6200B
Ethylbenzene 8
628
100
20
ugll
SM 6200B
Xylene (total) a
3990
300
43
ugll
SM 6200B
Methyl Teri Butyl Ether a
1380
100
20
ugll
SM 6Z00B
Alkalinity, Total as CaCO3
945
25
3.0
mgll
SM19 2320B
Carbon Dioxide
703
5.0
5.0
mg1I
SM19 45000O2D
Sulfate
4770
200
60
mgll
EPA 3001SW846 9056A
FA7708-5 MW-18
Benzene 3
182
10
2.0
ugll
SM 6200B
Toluene a
730
10
2.0
ug11
SM 6200B
Ethylbenzene a
368
10
2.0
ugll
SM 6200B
Xylene (total) a
1660
30
4.3
ugll
SM 6200B
Methyl Tert Butyl Ether a
139
10
2.0
ugll
SM 6Z00B
Alkalinity, Total as CaCO3
2640
25
3.0
mgll
SM19 2320B
■d 6 of 32
� ACCIJTEST.

Summary of Hits Page 2 of 2
.fob Number: FA7708
Account: Atlantic Richfield Company
Project: URSNCM:S/S 24163: 381 Knoliwood St, Winston-Salem, NC
Collected: 08/28/ 13
Lab Sample ID Client Sample I❑ Result/
Analyte Qual RL MDL Units Method
Carbon Dioxide
2230
5.0
5.0
mg/l
SM19 450OCO2D
Sulfate
7850
200
60
mg/l
EPA 300/SW846 9056A
FA7708-6 MW-19
Benzene
2710
100
20
ug/l
SM 6200B
Toluene
13100
250
50
ugll
SM 6200B
Ethylbenzene
1190
100
20
ug/1
SM 6200B
Xylene (total)
7420
300
43
ugll
SM 6200B
Methyl Teri Butyl Ether
3240
100
20
ug/l
SM 6200B
Alkalinity. Total as CaCO3
279
5.0
0.60
mgll
SM19 2320E
Carbon Dioxide
525
5.0
5.0
mgll
SM19 450000ZD
Sulfate
2660
200
60
mg/l
EPA 300/SW846 9056A
(a) Sample was not preserved to a pH < 2.
■■ 7 of 32
■.o.ccuT�sr
FA7708"'° °"'..

Section 4
. Southeast
M ACCUTEST
L n 00 RAT OR I L
Sample Results
Report of Analysis
C
on 8 of 32
0 ACCLJTP-ST.
FA7708 `......,....

Accutest LabLink@09:19 I2-Sep-2013
Report of Analysis
Client Sample ID: TRIP BLANK
Lab Sample ID: FA7708-1 Date Sampled: 08/28/13
Matrix: AQ - Trip Blank Water Date Received: 08/29/13
Method: SM 6200B Percent Solids: nla
Project: URSNCM:SIS 24163: 381 Knollwood St, Winston-Salem, NC
Page 1 of 1
He ID DF Analyzed By Prep Date Prep Batch Analytical Batch
R1111 #1 A0182342.1) 1 09/04/13 TD n1a nla VA1327
12un #2
Purge Volume
Run #1 10.0 ml
Run #2
Purgeable Aromatics, MTBE
GAS No.
Compound
Result
RL
MDL Units Q
71-43-2
Benzene
ND
0.50
0.10 u911
108-88-3
Toluene
N❑
0.50
0.10 ugll
100-41-4
Ethylbenzene
N❑
0.50
0.10 ugll
1330-20-7
Xylene (total)
N❑
1.5
0.22 ugll
1634-04-4
Methyl Tert Butyl Ether
ND
0.50
0.10 ugll
CAS No.
Surrogate Recoveries
Run# 1
Run# 2
Limits
1868-53-7
Dibromofluaromethane
97%
70-130%
17060-07-0
1,2-Dichloroethane-D4
98%
70-130%
2037-26-5
Toluene-D8
102%
70-130%
460-00-4
4-Bromofluorobenzene
104%
70-130%
N❑ = Not detected MDL - Method Detection Limit ] = Indicates an estimated value
RL = Reporting Limit B = Indicates analyte found in associated method blank
E = Indicates value exceeds calibration range N = Indicates presumptive evidence of a compound
A.
i
�■ 9 of 32
AGGIJTEtST.
FA7708

Accutest LabLink@09:19 12-Sep-2013
Report of Analysis
Client Sample ID: MWA
Lab Sample ID: FA7708-2 Date Sampled: 08/28/13
Matrix: AQ - Ground Water Date Received: 08/29/13
Method: SM 6200B Percent Solids: nla
Project: URSNCM:SIS 24163: 381 Knollwood St, Winston-Salem, NC
Page 1 of 1
File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
Run #1 A0182343.13 1 09/04/13 TD nla nla VA1327
Run #2
Purge Volume
Rim #1 10.0 mI
Hun #2
Purgeable Aromatics, MTBE
CAS No.
Compound
71-43-2
Benzene
108-88-3
Toluene
100-41-4
Ethylbenzene
1330-20-7
Xylene (total)
1634-04-4
Methyl Ter( Butyl Ether
CAS No.
Surrogate Recoveries
1868-53-7
Dibromofluoromethane
17060-07-0
1.2-Dichloroe(hane-D4
2037-26-5
Toluene-D8
460-00-4
4-Bromofluorobenzene
Result
RL
MDL
Units Q
3.6
0.50
0.10
ugll
0.12
0.50
0.10
ugll J
0.53
0.50
0.10
ug/l
0.31
1.5
0.22
ugll J
10.3
0.50
0.10
ugll
Run# 1 Run# 2 Limits
99%
70-130%
100%
70-130°%
100°%
70-130%
104%
70-130%
N❑ = Not detected MDL - Method Detection Limit
RL = Reporting Limit
E = Indicates value exceeds calibration range
j = indicates an estimated value
B = Indicates analyte found in associated method blank
N = Indicates presumptive evidence of a compound
ME 10 of 32
■ Aq--CU-rt=_s-r.
FAnoa .......... I.

Accutest LabLink909:19 12-Sep-2013
Report of Analysis
Client Sample ID: MW-3
Lab Sample ID: FA7708-2 Date Sampled: 08/28/13
Matrix: AQ - Ground Water Date Received: 08/29/13
Percent Solids: n/a
Project: URSNCM:S/S 24163: 381 Knollwood St, Winston-Salem. NC
General Chemistry
Analyte
Alkalinity, Total as CaCO3
Carbon Dioxide
Sulfate
Page 1 of 1
Result
RL MDL
Units DF
Analyzed By Method
377
5.0 0.60
mgll 1
09/09/13 14:40 HH SM19 23200
457
5.0 5.0
mg/1 1
09/09/13 14:40 HH 5M19 45000O2D
21.9
10 3.0
mgll 5
09/09/13 15:29 AA EPA 30015W846 9056A
RL = Reporting Limit
MDL = Method Detection Limit
U = Indicates a result < MDL
B = Indicates a result a = MDL but r RL
a
N
MA 11 of 32
w ACCUTEST.

Acculest LabLink@09:19 12-Sep-2013
Report of Analysis Page 1 of l
Client Sample ID.
MW-5R
Lab Sample 1D:
FA7708-3
Date Sampled:
08/28/13
:D.
Matrix:
AQ - Ground Water
Date Received:
08/29/13
Method:
SM 6200B
Percent Solids:
nla
Project:
URSNCM:SIS 24163: 381 Knollwood S(, Winston-Salem. NC
File ID
DF Analyzed By
Prep Date Prep Batch Analytical Batch
'Run #1 A0182349.1)
10 09/04/13 TD
nla nla
VA1327
'Run #2 A0182344.D 200 09/04/13 TD
nla nla
VA1327
Purge Volume
Run # 1 10.0 ml
Run #2 10.0 ml
Purgeable Aromatics, MTBE
CAS No.
Compound
71-43-2
Benzene
108-88-3
Toluene
100-41-4
Ethylbenzene
1330-20-7
Xylene (total)
1634-04-4
Methyl Tert Butyl Ether
CAS No,
Surrogate Recoveries
1868-53-7
Dibromofluoromethane
17060-07-0
1, 2-Dichloroethane-D4
2037-26-5
Toluene-D8
460-00-4
4-Bromofluorobenzene
(a) Sample was not preserved to a pH < 2.
(b) Result is
from Run# 2
Result
RL
MDL
Units Q
165
5.0
1.0
ugll
489
5.0
1.0
ugll
178
5.0
1.0
ugll
1380
15
2.2
ugli
417 b
100
20
ugll
Run# 1 Run# 2 Limits
91%
97%
70-130%
100%
100%
70-130%
100%
102%
70-130%
101%
104%
70-130%
ND = Not detected MDL - Method Detection Limit
RL = Reporting Limit
E = Indicates value exceeds calibration range
J = indicates an estimated value
B = indicates analyte found in associated method blank
N = Indicates presumptive evidence of a compound
■■ 12 of 32
.4CCLJTEST.
FA7708 ... " ""

Accutest LabLink@09:19 12-Sep-2013
Report of Analysis
Client Sample ID. MW-5R
Lab Sample ID: FA7708-3 Date Sampled: 08/28/13
Matrix: AQ - Ground Water Date Received: 08/29/13
Percent Solids: nla
Project: URSNCM:SIS 24163: 381 Knollwood St. Winston-Salem, NC
General Chemistry
Analyze
Alkalinity, Total as CaCO3
Carbon Dioxide
Sulfate
Page 1 of 1
W
a
Result
RL
MDL
Units
DF
Analyzed By Method
3590
25
3.0
mgll
1
09/11/13 17:00 HH SM19 2320E
1590
5.0
5.0
mgll
1
09/11/1317:DD HH SM19 45000O2D
13900
1000
300
mg/1
500
09/09/13 15.45 AA EPA 3001SW846 9056A
RL = Reporting Limit
MDL = Method Detection Limit
U = Indicates a result < MDL
B = Indicates a result > = MDL but < RL
�■ 13 of 32
■ .4CGlJTf=S-r.
FA77DB

Accutest LabLink@09:19 12-Sep-2013
Report of Analysis
Client Sample ID: MW-8R
Lab Sample ID: FA7708-4 Date Sampled: 08/28/13
Matrix: AQ - Ground Water Date Received: 09/29/13
Method: SM 6200B Percent Solids: nla
Project: URSNCM:S/S 24163. 381 Knoliwood St. Winston-Salem, NC
Page IofI
File I❑ DF Analyzed By Prep Date Prep Batch Analytical Batch
Run #1 a A0182345.13 200 09/04/13 TD nla nla VA1327
Run #2
Purge Volume
Run #1 10.0 ml
Run #2
Purgeable Aromatics, MTBE
CAS No.
Compound
Resuit
RL
MDL Units Q
71-43-2
Benzene
1600
100
20
ugll
108-88-3
Toluene
5390
100
20
ugll
100-41-4
Ethylbenxene
628
100
20
ugll
1330-20-7
Xylene (total)
3990
300
43
ugll
1634-04-4
Methyl Ter( Butyl Ether
1380
100
20
ugll
CAS No.
Surrogate Recoveries
Run# 1
Run# 2
Limits
1868-53-7
Dibromofluoromethane
97%
70-130%
17060-07-0
1, 2-Dichloroethane-D4
100%
70-130%
2037-26-5
Toluene-D8
102%
70-130%
460-00-4
4-Bromofluorobenzene
102%
70-130%
(a) Sample was not preserved to a pH < 2.
N❑ = Not detected MDL - Method Detection Limit J = Indicates an estimated value
RL ` Reporting Limit B = Indicates analyte found in associated method blank
E = Indicates value exceeds calibration range N = Indicates presumptive evidence of a compound
Mn 14 of 32
O ACC UTEST.
FA7708 �••�""'"".••

Accutest LabLink@09:19 12-Sep-2013
Report of Analysis
Client Sample ID: MW-8R
Lab Sample ID: FA7708-4 Date Sampled: 08/28/13
Matrix: AQ - Ground Water Date Received: 08/29/13
Percent Solids: nla
Project: URSNCM:S/S 24163: 381 Knoilwood St. Winston-Salem, NC
General Chemistry
Analyte
Alkalinity, Total as CaCO3
Carbon Dioxide
Sulfate
Page 1 of 1
Result
RL
MDL
Units
D)F
Analyzed By Method
945
25
3.0
mg/1
1
09/11/13 17:00 HH SM19 2320$
703
5.0
5.0
mgll
1
09/11/13 17:00 HH SM19 45WCO2D
4770
200
60
n19/1
100
09/09/13 16:01 AA EPA 3001SW846 9056A
RL = Reporting Limit
MDL = Method Detection Limit
U = Indicates a result < MDL
B = Indicates a result > = MDL but < RL
■■ 15 of 32
ACCLJTEST
FA7708

Accutest LabLinkP09:19 12-Sep-2013
Report of Analysis
Client Sample ID: MW-18
Lab Sample ID: FA7708-5 Date Sampled: 08/28/13
Matrix: AQ - Ground Water Date Received: 08/29/13
Method: SM 6Z00B Percent Solids: nla
Project: URSNCM:SIS 24163: 381 Knollwood St, Winston-Salem. NC
Page 1 of 1
File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
Run #1 a A0182350.D 20 09/04/13 TD nla nla VA1327
Run #2
Purge Volume
Run #1 10.0 mi
Run #2
Purgeable Aromatics, MTBE
CAS No.
Compound
Result
RL
MDL Units Q
71-43-2
Benzene
182
10
2.0 ug11
108-88-3
Toluene
730
to
Z.0 ugll
100-41-4
Ethylbenzene
368
10
Z.0 ugll
1330-20-7
Xylene [total]
1660
30
4.3 ugll
1634-04-4
Methyl Tert Butyl Ether
139
10
2.0 ugll
CAS No.
Surrogate Recoveries
Run# 1
Run# 2
Limits
1868-53-7
Dibromofluoromethane
98%
70-130%
17060-07-0
1,2-Dichloroethane-D4
100%
70-130%
2037-26-5
Toluene-D8
101%
70-130%
460-00-4
4-Bromofluorobeazene
101%
70-130%
(a) Sample was not preserved to a pH < 2.
AID = Not detected MDL - Method Detection Limit j = Indicates an estimated value
RL = Reporting Limit B = Indicates analyze found in associated method blank
E = Indicates value exceeds calibration range N = Indicates presumptive evidence of a compound
_' 16 of 32
ACCUTES-r:

Ac.cutest Labl-inkP09:19 I Z-Sep-2013
Report of Analysis
Client Sample ID: MW-18
Lab Sample ID: FA7708-5 Date Sampled: 08/28/13
Matrix: AQ - Ground Water Date Received: 08/29/13
Percent Solids: nla
Project: URSNCM:SIS 24163: 381 Knollwood St, Winston-Salem, NC
General Chemistry
Analytic
Alkalinity, Total as CaCO3
Carbon Dioxide
Sulfate
Page 1 of 1
Result
RL
MDL
Units
DF Analyzed By Method
2640
Z5
3.0
mg/1
I 09/11/13 17:00 HH 5M19 2320E
2230
5.0
5.0
mg/1
1 09/11/13 17:00 HH 5M19 45000O2D
7850
200
60
Ing/1
100 09/09/13 16:17 AA EPA 3001SW$46 9056A
RL = Reporting Limit
MDL = Method Detection Limit
U = Indicates a result < MDL
B = Indicates a result > = MDL but r RL
me 17 of 32
■ ACCU-TE=- T
FA7708

Accutest LabLink@09:19 12-Sep-2013
Report of Analysis
Client Sample ID: MW-19
Lab Sample ID: FA7708-6 Date Sampled: 08/28/13
Matrix: AQ - Ground Water Date Received: 08/29/13
Method: SM 6200B Percent Solids: nla
Project: URSNCM:S/S 24163: 381 Knollwood St, Winston-Salem. NC
Page I of 1
File ID
DF
Analyzed
By
Prep Date
Prep Batch
Analytical Batch
Run #1 A0182347.1)
200
09/04/13
TD
nla
nla
VA1327
Run #2 A0182351.1)
500
09/04/13
TD
nla
nla
VA1327
Purge Volume
Run #1 10.0 ml
Run #2 10.0 ml
Purgeable Aromatics, MTBE
CAS No.
Compound
Result
RL
MDL Units Q
71-43-2
Benzene
2710
100
20
ugll
108-88-3
Toluene
13100 a
250
50
ugll
100-41-4
Ethylbenzene
1190
100
20
ugll
1330-20-7
Xylene (total)
7420
300
43
ugll
1634-04-4
Methyl Teri Butyl Ether
3240
100
20
ugll
CAS No.
Surrogate Recoveries
Run# 1
Run# 2
Limits
1868-53-7
Dibromofluoromethane
97%
98%
70-130%
17060-07-0
1,2-Dichloroethane-D4
100%
100%
70-130%
2037-26-5
Toluene-D8
103%
103%
70-130%
460-00-4
4-Bromofluorobenzene
102%
103%
70-130°%
(a) Result is from Run# 2
ND = Not detected MDL - Method Detection Limit
RL = Reporting Limit
E = Indicates value exceeds calibration range
�I
j = Indicates an estimated value
S = Indicates analyte found in associated method blank
N = Indicates presumptive evidence of a compound
so 18 of 32
ACCLJTEB-T

Accutest Labl.ink@09:19 12-5ep-2013
Report of Analysis
Client Sample ID: MW-19
Lab Sample ID: FA7708-6 Date Sampled: 08/28/13
Matrix: AQ - Ground Water Date Received: 08/29/13
Percent Solids: nla
Project: URSNCM:SIS 24163: 381 Knollwood St, Winston-Salem, NC
General Chemistry
Analyte
Alkalinity, Total as CaCO3
Carbon Dioxide
Sulfate
Pale 1 Ol l
Result
RL
MDL
Units
DF
Analyzed By Method
279
5.0
0.60
mg/l
I
09/09/13 14:40 HH SM19 2320E
525
5.0
5.0
mg/1
1
09/09/13 14:40 HH SM19 45000O2D
2660
200
60
mg1l
100
09/09/13 16:33 AA EPA 3001SW846 9056A
RL = Reporting Limit
MDL = Method Detection Limit
U = Indicates a result < MDL
B = Indicates a result > = MDL but < RL
me 19 of 32
EACCLJ-rE 3-r-
FA7708 ...... """

Section 5
Southeast
AC C U-FFEE EBB T
LAE3❑RATORIE5
Misc. Forms
Custody Documents and Other Forms
Includes the following where applicable:
• Chain of Custody
C _-
on 20 of 32
� ACCIJTEST.
FA7709

FA7708: Chain of Custody
Page 1 of 3
21 of 32
� ,o,ccuTEs�
FA7108 ••�••,�•••

ACCUTEST LABORATORIES SAWLE RECEIPT CONFIRMATION
ACCUTESTS )OBNUMBER: IQ 7roo CLIENT. Ll 1,5 PROJECT: i 4 143
DATE(I IME RECEIVFXA 9 - - f .I o�wII%IIYY 21:00) NIIMBHR OF COOLERS RECUVEIX
METHOD OF DELIVERY; Q� m ACCUMSi COURIER GREYHOUI%w DELIVERY OTHER
AIRBILL NUMBMS: 'l 4 6 5 68'? 9 3 G 1 S
-COOLEkR WO&iTA IaN
CUSTODY SEAL ;TOT PRESENT OR NOT INTACT
CHAIN OF CUSTODY NOT RECEIVED (CDC)
ANALYSES REQUESTED 15 UNCLEAR OR MLSSRVO
SAMPLE DATES OR TIMES UNCLEAR OR NISM40
TEMEPERATURE CRITERIA NOT MET
L_JWET ICE PRESENT
T= BLANK WOxMATIaN
TAM FLANK PROVIDED
TRIP BLANK NOT PROVIDED
TRIP SLANG NOT ON COC
TRIP MAW MrACT
TRW BLANK NOT INTACT
RBCErfED WATER TRIP BLANK Z
L_IRECMZD SOIL TRIP BLANK
N
NUMBER OF ENCORES 7 25-{IRAM 3[4RAM
NUMBER OF "33 FIELD XM 7
NUMBER OF LAB FILTERRD METALS?
SUMMARY OF COMMENTS:
TEMPERATIME DFORMATION
THERM W_ CORR.FACTOR 404
BSERVED TENS
ORRECCED TEMP S:
SAMPLE INFORMATION
SAMPLE LABELS PKE&Wr ON ALL BOTTLES
INCORRECT NUMMER OF CONTAINERS USED
SAMPLE RECEIVED DdFROPERLY PRESERVED
F1CI6NT VOLUME FOR ANALYSIS
TBWIT S ON COC DO NOT MATTE SAMPLE LASH]
S ON Cw DO Nor MATCH LABEL
C VIALS BEAVE BRAIWACE (MACRO BUBBLES)
BOTTLES RECEIVED Bur ANALYSIS NOT REQUESTED
NO 8077LES RECEIVED FOR ANALYSIS REQUESTED
UNCLEAR FTLTBRINO OR COMPOSIT1140 INSTRUCTIONS
SAMPLE CONTAINERM RECEIVED BROKEN
WA SOLIDS IAA MT REC M VBP
"25 FIELD KIT FROZENWrru i 4813ows
SmUAL CHI.OKM PRESENT
]AMCABLE TO EPA 400 92RIE3 OR WORTS CAROLINA OROAMC7j
TECHNICIAN SIGNATURMATE C_ i5- - (3 REVIEWER SIM"TURFMATE 'Z -
NF 17J10
receipt cong"aWn 122910-xb
FA7708: Chain of Custody
Page 2 of 3
ma 22 ❑f 32
AcCLITEST.
FAT108 •••��••�••••

Setx MALL N9.
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ACCUTEST KIT REQUEST FORM
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[lfurt: BE
Cural PM: Grup Friwb
Project: BP 14163
Locallan! 3Si Knoll woal5arr:L W'rnuon-S&M NC
ROM bode: TUD
FNFOS Wmk Reltwin. ;gyp Enfat Project N:
Date Needed:
Sample bete: AW.UM 27 end 20, 2013
lnvu]n Ta: I'RS Curneranrm fou Suk,ntrmL
Arrelrtlratl SOW fber Breast•
Cnn nitanl: [!R,�,S'munrahon
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URN Project A: 38430760.I D4%Q
Vrp.+Jmr 10 A—,u ul Mohr: - WBS ActMty: S
Project Chemise: 6farba hievm-L.e4Morn s.illc - -
Phooe Na.: 9194161-1519
lfumber of Sarimlesp
bwx Meumms
Aeal le else
Reporting r, mh
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Unli Reles
5 primary unpin end I Trip Black
Were
Sludard Mndtodr
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UTEXeel MTBE
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• F-A.nrf Rryxrtreerwd Fvr entrtnn,wr,rmf L,.& amrr Anolyrrrl 5rlmrrx 8i faEnrwvey Monage l PMAn fra,MPt. Admcorr lPmAjWd C—gione• a 8P•
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• CiYidrlinrs,Mr tiernpfuu, YC ❑ENR [1}i 5xtlon..Ynen1 rerun - wAr�F n arrla6k q t�;'lM+.'u'.r,telrrnrx.mrJuflfJr; ilSungc,uWrlytt
Sample rmdts ere to be amilyved at the lowed dlludon prmibIt whi out harm to Um lsatmmeut•, rmd then sl the proper difudon to ensure
that reyulalacy levels are acider'e& Rom ht are 4r3 hr mfxlncd to the Method Dcwceoa Bost. Smopic ennr:cntrsuons shut arc Iris than sere PQL,
t,ur greoer Then the NDL are to }r 3-Flagged.
Ahdytlal TAT. -
Lab Cerliticafioa
F.Irrerlmlr IM hrrahec; to mtY.6fhi4Sonuumlg Care KLns ive. sugj ^r of gouni1r rneks and =miix dd OC n%LlL_ S•_M,le
$ocaptpaR MDr V k. Lad CDC mard_P,DO formatted in Eho1 for the EaviroDwo irovram: =W elediS nir
rtoov fadfl of the inraii--
Electronic Report Dedycred'ru: [phone]
S upplk%'Sreded I per Fvesi
• IN Ulm] VOA real&, pmpreserred wish HU, fir SM 62= anriym of worn 13 rims per wr4,Ie ud v spee,;9 i. Nrrtdlnp nave (HTP gld ds)s -
• 1840-nV VOA vid%Ur,TRFSFR VED. for SM 62WB ef9*5 of water{3 vtok pa Semple ell a spec sco. 1AN', "fag rmfr f Ilflv alma
6 pimus lxotka. wVmc =L of wtrrcinY we fix the dimmatinedion of C42 and SM in W-aaer i I pa Mnnk) CM III., t4h Hrwr Inn hn wlvvrrrf: 51f1i
e Trip 61aak f wren, I per cooler
r lnwpty real& vrel bottle With
• Cuolert n) Isbeird with Iebormary name aril allew
• kenrn c1ri4WS labels, pne pnntexl vAlh the labmimry name: aced alines [ i per cooler)
• Insulation errd ehporkne p"ig tnverivl
Y Tcmpctar nrr beanies (I per cwlcrf
e Hxk(l Farpms air Mils I per ca,lcrl
tihip 5 u pp3 ics Tn:
ke 5te:nhem.Hcumet
URSCurdrratum _
16f10 Pcrimrtcf Park Drive, So" 4M
Mgmsnlle, NC 2756D _
Phnae Ne. 19191 A61-t ] DD
r I I^famel
PLEASE INCUME" 7.i W on the ousels of time ocialeir to WU3tate retrieval from our nodimam.
Kir Retluest Taken By: ICU Cnmplcud By'
Dews: Date lef l:
`Lktaoon I,M% Yarn be knit d= lea PQL M NC roo,01 ee, Pml0.,p1 Smn Wr:t kwKY,6rm,. kwrr
' M%u ,p&Mrsis r rpihr dipbniti,ur;4mair ra hlwltk whm max dun 10 eangle:ue..drnnrd eo ur:a, kr a fnm eras
Conramer rypea aid n f bas Ptr 5rm CaiMi—
P'VSIrd4npe.VaC124163, CK- W S, 381 KnufWns+d Stfar M.O Silt Dociv 6 AnalyucaNknilyl leaf Reyr+e SV 24163 .+kYvtex Kv Request Fenn M.12-13i.ehcx
V1?00I]9:19 PM
L's

Section 6
■ Southeast
E ACCUTEST"
A 13 O R A T 0 R I E S
GUMS Volatiles
QC Data Summaries
Includes the following where applicable:
• Method Blank Summaries
• Blank Spike Summaries
■ Matrix Spike and Duplicate Summaries
■:.: 24 of 32
ACCLITEST.
FA7708

Method Blank Summary Page 1 of 1
.lob Number: FA7708
Account: BPAMSS Atlantic Richfield Company
Project: URSNCM:S/S 24163: 381 Knollwood St, Winston-Salem. NC
Sample
File ID DF
Analyzed
By
Prep Date
Prep Batch
Analytical Batch
VA1327-MB
A0182341.1) 1
09/04/13
TD
nla
nla
VA1327
The QC reported here applies to the following samples: Method: SM 6200B
FA7708-1. FA7708-2, FA7708-3, FA7708-4, FA7708-5, FA7708-6
CAS No.
Compound
Result
RL
MDL
Units Q
71-43-2
Benzene
N➢
0.50
0.10
ugll
100-41-4
Ithylhenzene
ND
0.50
0.10
ugll
1634-04-4
Methyl Tert Butyl Ether
ND
0.50
0.10
ugll
108-88-3
Toluene
ND
0.50
0.10
ugll
1330-20-7
Xylene (total)
N❑
1.5
0.22
ugll
CAS No. Surrogate Recoveries Limits
1868-53-7
Dibromofluoromethane
97%
70-130%
17060-07-0
1,2-Dichloroethane-D4
99%
70-130%
2037-26-5
Toluene-D8
102%
70-130°%
460-00-4
4•Brnmofluorobenaene
104%
70-130%
Qf�
MZ 25 of 32
■ .CC(-_u-TEST.
FA7708 "

Blank Spike Summary Page 1 of 1
Job Number: FA7708
Account: BPAMSS Atlantic Richfield Company
Project: URSNCM:SIS 24163: 381 Knollwood St, Winston-Salem, NC
Sample
File ID DF
Analyzed
By
Prep Date
Prep Batch
Analytical Batch
VA1327-BS
A0182339.1) 1
09/04/13
TD
nla
nla
VA1327
The QC reported here applies to the following samples: Method: Ski 6200B
FA7708-1. FA7708-2, FA7708-3. FA7708-4, FA7708-5. FA7708-6
CAS No. Compound
71-43-2
Benzene
100-41-4
Ethylbenzene
1634-04-4
Methyl Tert Butyl Ether
108-88-3
Toluene
1330-20-7
Xylene ((otal)
CAS No. Surrogate Recoveries
1868-53-7 Dibromofluoromethane
17060-07-0 1,2-Dichloroethane-D4
203746-5 Toluene-D8
460-00-4 4-Bromofluorobenzene
* = Outside of Control Limits.
Spike BSP BSP
ug/l ugll % Limits
10
10.8
108
70-130
10
10.8
108
70-130
10
9.7
97
70-130
10
10.6
106
70-130
30
35.1
117
70-130
BSP Limits
100%
70-130%
101%
70-130%
100%
70-130%
100%
70-130%
no 26 of 32
■ .ar_-cuTF-s-r.
FA7709 `••""••"••••

Matrix Spike/Matrix Spike Duplicate Summary Page 1 of 1
Job Number: FA7708
Account: BPAMSS Atlantic Richfield Company
Project: URSNCM:S/S 24163: 381 Knollwood St, Winston-Salem, NC
Sample
File ID DF
Analyzed
By
Prep Date
Prep Batch
Analytical Batch
FA7708-6MS
A0182353.1) 500
09/04/13
TD
nla
nla
VA1327
FA7708-6MSD
A0182354.1] 500
09/04/13
TD
nla
nla
VA1327
FA7708-6
A0182347.1) 200
09/04/13
TD
nla
nla
VA1327
FA7708-6
A0182351.1) 500
09/04/13
TD
nla
nla
VA1327
The QC reported here applies to the following samples, Method: SM 6200B
FA7708-1, FA7708-2. FA7708-3, FA7708-4, FA7708.5, FA7708-6
FA7709-6
Spike
MS MS
MSD
MSD
Limits
CAS No.
Compound
ugll Q
ugll
ugll %
ug/l
%
RP❑
Red"D
71-43-2
Benzene
2710
5000
7090 88
8840
123
22*
70-130120
100-41-4
Ethylbenzene
1190
5000
5600 88
7390
124
28*
70-130120
1634-04-4
Methyl Ter( Butyl Ether
3240
5000
7090 77
8770
111
21*
70-130120
108-88-3
Toluene
13100 h
5000
16500 68* a
18300
104
10
70-130/20
1330-20-7
Xylene (total)
7420
15000
21600 95
27600
135* 24*
70-130120
CAS No.
Surrogate Recoveries
MS
MSD
FA770"
FA770"
Limits
1868-53-7
Dibromofluoromethane
99%
100%
97%
98%
70-130%
17060-07-0
1,2-Dichloroethane-D4
101%
102°%
100%
100°%
70-130%
2037-26-5
Toluene-D8
100%
99%
103%
103%
70-130%
460-00-4
4-Bromofluorobenzene
101%
100%
102%
103%
70-130%
(a) Outside control limits due to high level in sample relative
to spike
amount.
(b) Result is from Rune #2.
* = Outside of Control Limits.
27 of 32
■ �,ccu-rt=sT
FA7708 ••""•,"°".

Section 7
Southeast
W AC, —CUTEST
L A 6 OR AT O R I E$
General Chemistry
QC Data Summaries
Includes the following where applicable:
• Method Blank and Blank Spike Summaries
■ Duplicate Summaries
• Matrix Spike Summaries
so 28 of 32
E A( --CUTEST
FA7708 I-.-T..-

METHOD BLANK AND SPIKE RESULTS SUMMARY
GENERAL CHEMISTRY
Login Number: FA77QB
Account: BPAM55 - Atlantic Richfield Company
Project: URSNCM:5/5 24163: 381 Knoliwood St, Winston-Salem, NC
MS Spike BSP BSP QC
Analyte Batch 1D RL Result Units Amount Result %Recov Limits
Alkalinity, Total as CaCO3 GN57627
5.0
0.90
mgll
250
I01.0
90-113%
Alkalinity, Total as CaCO3 GN57634
25
0.0
mg/1
250
260
104.0
90-113%
Chloride GF2:434/GN57595
2.0
0.0
mg/I
50
50.7
101.4
90-110%
Sulfate GP22,434/GN57595
2.0
0.0
mg/l
50
50.4
100.8
90-110t
Associated Samples:
Batch GN57627: FA7700-2, FA7708-6
Batch GN57634: FA7706-3, FA7708-4, FA7708-5
Batch GP22434: FA7708-2, FA770i-3, FA7708-4, FA7708-5,
FA7708-6
{*) Outside of ¢C limits
Page 1
M■ 29 of 32
w A.CCLlT1=—C3T.
FA7708 ° "

DUPLICATE RESULTS SUMMARY
GENERAL CHEMISTRY
Login Number: FA7709
ACCnunt: BPAMSS - Atlantic Richfield Company
Project: URSNCM:S/5 24163: 381 Knollwood 5t. Winston-Salem, NC
Oc Original OUP QC
Analyte Batch ID Sample Knits Result Result RPD Limits
Alkalinity, Total as CaCO3 GN57627 FA7708-2 mgll 377 377 0.0 0-20%
Alkalinity, Total as CaCO3 GN57634 FA7621-1 Mg/1 938 935 0.1 0-20%
Associated Samples:
Hatch GN57627: FA7709-2, FA7708-6
Batch GN57634: FA7708-3. FA7708-4, FA7708-5
i*) Outside of QC limits
Fade ]
N
F
■■ 30 of 32
� !-\CCUTEBT.
PA7708

MATRIX SPIKE RESULTS SUMMARY
GENERAL CHEMISTRY
Login Number: FA7748
Account: BPAMSS - Atlantic Richfield Company
Project: URSNCM:S/S 24163: 381 Knollwood St, Winston-Salem, NC
QC Original Spike MS QC
Analyte Batch IB Sample Units Result Amount Rezult 6Rec Limits
Chloride GP22434/GN57595 FA7774-3 rtig/l �8.8 50 77.1 96.6 90-110%
Sulfate GP22434/GN57595 FA7774-3 mg/l 8.7 50 57'l 97.4 94-11QM
Associated Samples:
Batch GP22434: FA7708-2, FA1786-3. FA77Q8-4, FA7708-5, FA7708-6
I•I Outside of QC limits
(NI Matrix Spike Rec. outside of 4C limits
of
so 31 of 32
■ AQCLJTEE—=T.
FA7708 ...... •

MATRIX SPIKE DUPLICATE RESULTS SUMMARY
GENERAL CHEMISTRY
Login Humber: FA7708
Account: BPAYSS - Atlantic Richfield Company
Project; URSNCM:S/S 24163: 381 Knollwood St, Winston-Salem, NC
Qc Original Spike MSD QC
Analyte Batch ID Sample Units Result Amount Result RFD Limit
Chloride GP22434/GN57595 FA7774-3 mg/1 28.8 5❑ 77.3 0.3 209
Sulfate GP22434/GN57595 FA7774-3 mg/l 8.7 SD 56.7 1.2 2D€
Associated Samples:
Batch GP22434: FA7708-2, FA7708-3, FA1708-4, FA7708-5, FA7708-6
(1) Outside of QC limits
M Matrix Spike Rec. outside of QC limits
■■ 32 of 32
■ ,B.CCUTEs-r.
FA7708 `"'""""""'

APPENDIX E
HISTORICAL GROUNDWATER FIELD PARAMETER DATA

Appendix E
Historical Groundwater Field Parameter Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
Well
Date
Sodium
Persulfate
pH
DRP
Temp.
Specific
Cond.
DO
91E.
S.U.
mV
T
Ms/cm
mg/L
MW-03
3123106
-
6.97
-44
19.1
0A96
0.48
518107
-
7.00
-190.8
20.30
0.388
1.00
5114108
--
6.18
--
19.0
0.668
--
5128109
--
7.20
--
19.7
0.452
5/27/10
--
6.94
36.3
19.09
0.390
2.1
10/31/11
--
6.84
-72
22.04
1.171
3.2
5/22/12
0.07
7.13
-5.4
2032
0.708
4.6
6114112
N❑
6.84
21.7
20.53
0.854
0.5
719112
ND
T08
-7
21.42
0.753
3.6
8/14/12
N❑
7.02
-51.9
22.43
0.552
2.7
9/19112
0.07
7.00
-125.9
22.06
0.854
0.9
1215112
--
6.89
-66.6
20.65
0.774
1.3
2126112
--
6.61
-72.5
16.30
0.573
1.3
5/31111
6.82
-10.6
19.81
0.823
3.8
8/28/13
6.65
-21.3
22.43
0.855
1.93
MW-05
3/23/06
--
5.67
5.0
18.44
0-144
0.77
518107
5.15
143.2
20.60
0.076
0.65
5114109
3.45
-
I9.5
0.104
--
5128109
6.11
-
19.7
0.328
--
MW-5R
5127110
2.62a
129.1
18.95
0,193
4.1
10/31/11
4.89
185.6
22.00
0.123
1.7
5/22/12
ND
4.19
153.9
20.04
0.079
1.1
6/14/12
ND
13.08
8.9
23.57
37.82
0.5
719112
ND
13.10
39.9
22.42
35.02
7.2
8/14/12
0.07'
13.38
144.1
23.36
34A]
0.3
9/19112
ND
13.36
39.9
23.12
46.21
0.2
12/5112
--
12.39
1.2
22.79
27.87
0.6
2/26112
--
11.66
-44.7
15.14
W44
1.2
5/31113
--
10.76
-60.4
20.03
1125
0.7
8/28/13
--
11.42
165.1
22.12
29.66
3.01
MW-06
312-3106
--
6.18
217
18.19
0.656
0.3
518107
--
6.59
67.7
19.22
0.683
-101
5/14/08
--
5.40
19.2
0.382
--
5128109
--
4.51
19.3
0.325
-
5127110
--
5.97
88.4
17.91
0.311
10/31/11
--
13.77-
-184.7
20.71
49.97
1.25
Ill-i16i
3/23/06
--
6.08
-32
18.3
0.277
0.25
518107
--
6.67
-123.5
19.66
0.169
0.40
5/14108
--
6.32
--
18.3
0.159
-
5128109
-
6.43
19.4
0.132
-
5127110
--
5.35
10.3
18.57
1
0.060
0.67
1013111 1
--
6.89
-32.5
18.85
0.18
1.40
� JtNrt.'- ... -_-1 f•. 11 W.S UI F.Ik.0 iXwo it rkQ• b1CA%I Dn My rkY.r[a k u2J Ay W]y(W E.w[).w Rq-n Fd.L.'•Y.1. .Aryeeti r Cqi` 1.41. ] 1I

Appendix E
Historical Groundwater Field Parameter Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
Well
Date
Sodium
Persulfate
pH
ORP
Temp.
Specific
Cond.
DO
g/L
s.u.
mV
°C
mSlcm
mg/L
MW-08
312 3106
--
6.95
-150
17.93
0.601
0.14
518107
--
7.05
-118.0
19.88
0.556 1
0.36
5/14/08
5.91
--
19.3
0.445
-
5128109
--
6.49
--
19.5
0.469
--
MW-811
5127110
4.03
105.1
18.38
0.090
2.55
10/31/11
4.80
198.1
21.99
0.250
1.9
5/22/12
ND
4.59
250.4
19.80
0.158
().8
6/ 14/12
32,18
13.32
17.2
22.80
194.5
17. W
719112
8.4
13.38
116.7
2I.56
68.5
32.853
8/14/12
3.64
13.09
171
21.75
20.15
42.28'
9/19/12
0.665
12.74
123.9
21.92
19.1
13.97`
1215112
N❑
11.34
25A
22.10
6.993
2.1
2/26/12
-
10.02
-59.2
15.35
2.298
0.7
5/31 / 13
--
10.18
-25.1
19.66
2.322
0.6
8/28/13
9.10
173.2
21.96
14.13
3.15
MW-14
3/23/06
4.62
257
18.99
0.081
0.39
518107
-
4.46
196.8
19.09
0.060
0.95
5114/08
4.49
--
18.8
0.079
--
5128109
4.75
--
19.9
0.077
--
5127110
1.56'
253.3
18.82
0.169
2.97
10/31/11
4.59
260.9
21,3I
0.157
2.94
MW-15
3/23106
4.48
294
17.85
0.048
0.O6
518107
-
4.31
-134.4
19.34
0.042
0.32
5/14/08
-
3.40
--
19.3
0.042
--
5128109
--
--
--
--
-
5127110
--
3.46
119,5
17.03
0,130
2.99
10/31/11
-
4.44
254.1
19.32
0.060
2.80
MW-16
3/23/06
--
4.33
529
18.07
-
6.81
518107
-
-
--
-
5/14/08
-
3.83
-
17.7
0.730
-
5/28/09
--
-
--
-
5127110
--
3.97
99.9
17.32
0.687
1-60
10/31/11
--
4A4
244.9
19.62
0.706
120
MW-17
3/23/06
4.21
488
18.86
--
4.63
518107
6.46
-14.4
20.06
0.392
1.15
5/14/08
--
4.98
--
20.1
0.391
--
5128109
--
6.11
--
19.6
0.310
-
5127110
5,25
57.9
18.43
0.287
0.57
10/31/11
6.31
-90.5
20.80
0.556
0.66
P 19YS.uXeuwClx. 143. [x w.3. 41 kbc+a.f w. 011eU..rrikn5 1 fk.n w"s o.J­r 2A An M14GW l',"Qk� Apr. a (W-F& ru} 1$ --

Appendix E
Historical Groundwater Field Parameter Data
Former RP Service Station No. 24163
381 KnoIlwood Street
Winston-Salem, Forsyth County, North Carolina
11 ell
Date
Sodium
Persulfate
pH
ORP
Temp.
Specific
Cond.
DO
911-
s.u.
mV
"C
mSlcm
mg/L
MW-18
10/31/11
--
6.86
12.9
22.47
0.117
2.4
5122/12
ND
6.20
30.7
21.43
0.001
3.0
6/14/12
ND
13.12
5
21.06
54.11
0.3
719112
ND
11.92
40.4
21.29
10.05
1.2
8/14/12
ND
10.88
-35
22.59
2.533
0.2
9119112
ND
11.09
-35
22.59
3.301
0.2
1215112
--
6.91
-68.1
27.85
0.859
0.7
2/26/12
6.11
-84.2
14.86
0,599
IA
5/31 / 13
6.42
-117.2
19.62
1.036
1.0
8/28/ 13
-
9.06
219.9
21.71
16.08
1.79
MW-19
10131/11
--
5.37
190
21.81
0.193
3.9
5122/121
ND
4.62
131.7
19.89
0.103
0.9
6/14/12
6.615
13.30
-15.8
21.57
117.8
22.38'
719112
ND
12.75
-16.')
21.91
13.4
25.79)
8114/12
0.07'
12.50
162
22.57
10.21
25.463
9/19/12
0.07'
11.71
157
22.47
3.424
12.93
1 J5112
-
9.99
20.1
23.03
1.537
5.2
2126J12
-
8.14
-41.9
W95
1,511
0.8
5/31/13
-
7.50
192.5
19.86
5.885
2.7
9/28/13
-
6.20
213.1
21.16
5.29
3,30
Notes:
1.) Sodium persulfate test kits results of 0.07 g/L are treated as "non -detections", as they are within the
margin -of -error for detection.
2.) Values are not con sistant with historic values and may be the result of instrument malfunction.
3.) Dissolved oxygen results above saturation (approximately 9.1 mg/L at 20"C) are considered to
represent measurement error and are not considered representative of actual dissolved oxygen
concentration in groundwater. Error in measurements for the sensor used, a steady-state polarographic
sensor, can be caused membrane fouling and interference gases, among other causes (YSI. 2009). The
likelihood of measurement error from these sources may have been heightened by the injection.
4.) Elevated pH is the result of the October 2011 sodium hydroxide pilot test injection adjacent to MW-6.
Subsequent elevated pH measurements in MW-5R, MW-8R, MW-18, and MW-19 are associated with
June 2012 and June 2013 sodium persulfate and sodium hydroxide injections.
- 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.
ORP - oxidation reduction potential
DO - dissolved oxygen
g/L - grams per liter
s.u. - standard units
mV - millivolts
T - degrees Celsius
mSlcm - millisiemens per centimeter
mg1L - milligrams per liter
-- " = Not Measured
ND - Not Detected
Temp. - temperature
Specific Cond. - specific conductance
P �HAPnha+.lYfuWI-K W S. 31 IR Lkl..aih 0l F*O EnWn:_.Aw:FI IkCX 9,e. u.uu> Wps %lAppn .w0.pn 1. P• 3 of 3

APPENDIX F
ASP INJECTION PERFORMANCE MONITORING PARAMETER
TIME-TREN❑ GRAPHS

9000
8000
7000
J
6000
ho
7
C
Q
5000
L
4000
w
C
w
N
y 3000
cc
2000
1000
0
Benzene Concentrations over Time
Date
MW-3 (control)
MW-SR
MW-8R
MW-18
MW-19
— -GCL

40
35
J 30
c
Q
roc 2 5
L
u
O
V 20
d
r.+
m
w
7
L
15
E
Un 10
5
G
Sodium Persulfate Concentrations over Time
❑ate
i
MW-3 (control)
MW-5R
MW-8R
-- MW-18
MW-19

pH over Time
16.0
14.0
12.0
10.0
cn 8. o
6.❑
11Rol
2.0
w
,tib ,tib ,ti0 ,y0 ,ti0 ,tiQ ,ti0 ,yQ ,Lb .tib ,LQ ,LQ .�Q ,yQ ,tiQ .yQ ,y0 ,�O ,tiQ ,y0 ,ti0 ,ti0 ,�O
,�ti1 3b1 ��1 ,��1 ��1 ,��1 ,col ,�til ,�Ql ,��1 ,�til ,�bl ,��1 ,�Q1 ,�ti1 �•,1 ,��1 ,�ti1 ,�Q1 ,��1 ,�Ql ,��1 ,��/
©ate
M W - 3 (control)
MW-SR
MW-$R
MW-18
MW-19
P. ePV-w�% CL'4%3- [ K W S. sRI Rnidi—i SnewLS o tk+M bk kS I Dr ft • IMmm Adi. r NONA-24 Aug 2QI3 GW E-1 Q IY AFT—h e., u.d Grayha iWy It

#m
10000
•rrr
8000
rIM
t G000
cu
.X 5000
O
c
4000
L
U
41816I+1
2000
1000
n
Carbon Dioxide over Time
Date
MW-3 (control)
M W-5R
M W-8R
MW-18
MW-19

20000
18000
16000
14000
12000
J
CC1A
C
� 1Q000
[IS
W
LA 8000
6000
4000
IOICT61
191
Sulfate over Time
Date
MW-3 (control)
MW-5R
BMW-8R
MW-18
MW-19

250
WE
50
C
Specific Conductivity over Time
Date
MW-3 (control)
M W-5R
MW-8R
- MW-18
MW-19