WI0400198_Semi-Annual Report_20150624

June 24, 2015
Mr. Charles Sherren
Thruway Shopping Center, LLC.
7501 Wisconsin Avenue, Suite 1500
Bethesda, Maryland, 20814
RE: Semi -Annual 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: 60426590
Dear Mr. Sherren:
Please find enclosed a CD containing an electronic copy of the Semi -Annual 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 the
undersigned at [phone] or [e-mail].
Sincerely,
URS Corporation — North Carolina
Jasen Zinna, PE
Project Manager
Enclosure
URS Corporation — North Carolina
1600 Perimeter Park Drive, Suite 400
Morrisville, NC 27560
Tel: [phone]
Fax: [phone]

June 24, 2015
UIC Program Staff
DWQ — Aquifer Protection Section
1636 Mail Service Center
Raleigh, NC 27699-1636
DWQ — Aquifer Protection Section
Winston-Salem Regional Office
585 Waughton Street
Winston-Salem, NC 27107
RE: Semi -Annual 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: 60426590
Dear Mr. Slusser:
Please find enclosed the Semi -Annual Report for the above referenced site. The report
documents injection performance monitoring activities including the most recent
groundwater sampling event performed in April 2015.
The enclosed report is intended to continue the semi-annual reporting schedule proposed
in the site Corrective Action Plan (CAP). Should you have any questions regarding this
submittal, please do not hesitate to contact the undersigned at [phone] or
[e-mail].
Sincerely,
URS Corporation — North Carolina
Jasen Zinna, PE
Project Manager
Enclosure
cc: Charles Sherren, Thruway Shopping Center, LLC (CD); ENFOS, BP (electronic);
Project File (electronic)
URS Corporation — North Carolina
1600 Perimeter Park Drive, Suite 400
Morrisville, NC 27560
Tel: [phone]
Fax: [phone]

SEMI-ANNUAL STATUS REPORT
FORMER KNOLLWOOD GULF STATION (BP 24163)
381 KNOLLWOOD STREET
WINSTON-SALEM, FORSYTH COUNTY, NORTH CAROLINA
INCIDENT NO.: 6400
RISK RANK: LOW
LAND USE CLASSIFICATION: INDUSTRIAL/COMMERCIAL
AECOM PROJECT NO.: 60426590
Prepared for:
Atlantic Richfield Company (ARCO)
A BP Products North America Inc. 1�p
affiliated company
4850 East 49t' Street
MBC-3 Room 155C x
Cuyahoga Heights, Ohio 44125
June 24, 2015
Prepared by:
URS Corporation — North Carolina
1600 Perimeter Park Drive, Suite 400
Morrisville, North Carolina 27560 UM
Tel. [phone]
Fax [phone]

Table of Contents
Section1 Introduction.....................................................................................................................1-1
1.1 Site Description........................................................................................ 1-1
1.2 Project Background.................................................................................. 1-1
Section 2 Injection Performance Monitoring................................................................................2-1
2.1 Groundwater Sampling Procedures......................................................... 2-1
Section 3 Results and Discussion.................................................................................................3-1
3.1 Groundwater Sampling Results............................................................... 3-1
3.2 Performance Monitoring Discussion....................................................... 3-1
Section 4 Statement of Limitations................................................................................................4-1
Section5 References...................................................................................................................... 5-1
TABLES
Table 1 Monitoring Well Construction Data
Table 2 Summary of Groundwater Results Compared to NC Gross Contamination Levels,
April 23, 2015
Table 3 Groundwater Field Parameter Data, April 23, 2015
FIGURES
Figure 1 Location Map
Figure 2 Site Map
APPENDICES
Appendix A Historical Groundwater Elevation Data
Appendix B Historical Groundwater Analytical Summary
Appendix C Laboratory Analytical Report
Appendix D Historical Groundwater Field Parameter Data
Appendix E Performance Monitoring Parameter Time -Trend Graphs
I= ii

Certification Page
FORMER KNOLLWOOD GULF STATION (BP 24163)
381 KNOLLWOOD STREET
WINSTON-SALEM, FORSYTH COUNTY, NC
Report Date:
June 24, 2015
Groundwater Incident Number:
6400
Land Use Category:
Industrial/Commercial
Risk Classification:
Low (No Further Action)
Responsible Party:
Atlantic Richfield Company
% BP Products North America, Inc
4850 East 49th Street
MBC-3 Room 155C
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
[phone]
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: 36°05'25.94"N (Topographical Map)
Longitude: 80' l T 11.79"W
I, Jasen Zinna, a licensed engineer for URS Corporation -- North Carolina, do attest that the
information contained in this report is corre, j10 "urate to the best of my knowledge.
0 i
O�Q E S s � oyi2
�:Q SEAL
040228
Jasen Z' P.E. �� . Date
URS Co ration — rih Carolina %�''ys �!�
URS Corporation — North Carolina is licensed to practice geology/engineering in North Carolina -
The certification numbers of the corporation are C-328 and C-2243, respectively.

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 Groundwater
Monitoring Report for Former BP Station No. 24163 located at 381 Knollwood Street, Winston-
Salem, Forsyth County, North Carolina (site). This report is intended to satisfy the final project
evaluation reporting requirement specified in Part VII, Item 5 of the Renewal Issuance of
Injection Permit WI0400198 (NCDENR, 2013). This report presents the procedures and results
for the groundwater sampling event performed in April 2015.
1.1 SITE DESCRIPTION
The site is located on the eastern side of Knollwood Street, southeast of the intersection with
Interstate 40 Business in Winston-Salem, North Carolina. A USGS topographic map depicting
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
Tank (UST). All UST systems and buildings have been removed from the site and the property is
currently utilized 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 Corrective Action Plan (CAP)(URS 2011).
A site map illustrating 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 persulfate (ASP) injections were performed at the site in accordance with
the CAP which was approved by the North Carolina Department of Natural Resources
(NCDENR) Division of Waste Management (DWM) UST Section (NCDENR, 2011 a). An
Underground Injection Control (UIC) permit application, summarizing the proposed injection
activities, was submitted to the NCDENR Division of Water Quality (DWQ) on July 5, 2011.
Injection Permit No. WI0400198 was issued by the DWQ on August 9, 2011 (NCDENR,
201 lb).
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 Permit 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).

SECTIONONE Introduction
Groundwater sampling events performed in December 2012 and February 2013 were
documented in a Semi -Annual Data Report (URS, 2013b).
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.
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 Quarterly Status
Report submitted in August 2013 (URS, 2013c). Quarterly groundwater sampling events were
conducted in August 2013, November 2013, February 2014, and June 2014 following the second
injection. Sampling data for these events were documented in Quarterly Status Reports submitted
in December 2013, February 2014, May 2014, and December 2014, respectively (URS, 2013d;
URS, 2014a; URS, 2014b; URS, 2014c).
NCDENR issued a request for Notice of Residual Petroleum (NORP) on January 23, 2015 and
reduced the risk classification to low. The NORP was recorded with Forsyth County Register of
Deeds and public notice letters were sent to the respective parties. A Notice of No Further
Action was issued by NCDENR on April 28, 2015.
US 1-2

SECTIONTWO Injection Performance Monitoring
2.1 GROUNDWATER SAMPLING PROCEDURES
Groundwater sampling was performed on April 23, 2015. The event included sampling of
monitoring wells MW-3, MW-5R, MW-8R, MW-18, and MW-19 in accordance with the
injection well permit.
Prior to sampling, groundwater levels were gauged in each monitoring well utilizing a water
level meter decontaminated with soap and water prior to each measurement. April 2015 water
level measurements are presented along with historical gauging data in Appendix A. A water
table elevation contour map based on the measurements is depicted on Figure 3.
Following gauging, each well was sampled utilizing low -flow techniques with new tubing. After
stabilization criteria were met, groundwater from each well was transferred to pre -labeled,
laboratory -prepared containers and promptly placed on ice in a cooler with a temperature and trip
blank. The samples were shipped under chain -of -custody via overnight courier to Accutest
Laboratories Southeast and analyzed for sulfate utilizing EPA Method 300 and carbon dioxide
utilizing Sample Method 4500.
Groundwater pH, dissolved oxygen, temperature, oxidation-reduction potential, and specific
conductance were measured in the field at each well utilizing a calibrated Yellow Springs
Instrument YSI-5569 water quality meter. Purged groundwater was discharged onto a permeable
area of the site in accordance with the UST Section Guidelines for Sampling (NCDENR, 2008a).
um 2-1

SECTIONTHREE Results and Discussion
3.1 GROUNDWATER SAMPLING RESULTS
Groundwater laboratory analytical results for the April 2015 sampling events are presented in
Table 2. Historical analytical data are presented in Appendix B. The laboratory analytical report
for the April 2015 groundwater sampling events are included in Appendix C. Groundwater field
parameter data for the April 2015 sampling events are presented in Table 3. Historical field
parameters are presented in Appendix D. Time -trend graphs of various parameters associated
with injection performance monitoring are included in Appendix E.
URS Corporation validated analytical results from the April 2015 groundwater monitoring event
at the Site. The data review was modeled after the USEPA Contract Laboratory Program
National Functional Guideline for Superfund Organic Methods Data Review (USEPA, 2008).
Qualitative and quantitative limitations associated with the analytical results were determined
based on the results of specific quality control criteria. Accuracy was determined from the
review of spike recoveries and calibration data. Precision was based on the evaluation of field
and laboratory duplicate results. Representativeness was evaluated from the review of holding
times and blank data. Sample results have been qualified based on the results of the data review
process. The overall completeness objective for the project was met. A copy of the data
validation report is available upon request.
3.2 PERFORMANCE MONITORING DISCUSSION
Performance monitoring results through 2014 are discussed in detail in the Quarterly Status
Report submitted in December 2014 (URS, 2014c). The following list provides a brief summary
of notable performance monitoring trends.
• April 2015 groundwater field parameter results were consistent with historical
monitoring events. The pH levels in the monitoring wells ranged from 5.49 (MW-19)
to 8.64 (MW-5R) and appear to be stabilizing.
• Sulfate concentrations in MW-5R, MW-8R, MW-18, and MW-19 are above the
groundwater quality standard of 250 mg/L.
Based on these conclusions, URS recommends the following course of action:
• It is recommended to continue collecting groundwater samples from MW-5R, MW-
8R, MW-18, and MW-19 and have them analyzed for sulfate on a semi-annual basis
until sulfate concentrations are below the groundwater quality standard. Additionally,
groundwater field parameters will be collected during each sampling event. It is
recommended to discontinue collecting groundwater samples from MW-3 for sulfate
since concentrations have never exceeded the groundwater quality standard.
Furthermore, it is recommended to discontinue analyzing for carbon dioxide since
there is no applicable groundwater quality standard.
tS 3-1

SECTIONFOUR 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 utilized 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.
The failure of URS 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.
US 4-1

SECTIONFIVE References
NCDENR, 2008a. Guidelines for Sampling. UST Section, North Carolina Department of
Environment and Natural Resources Division of Waste Management. July 15, 2008
Version.
NCDENR, 2011 a. Notice of Regulatory Requirements, 15A 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, 201lb. 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, 2012.
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. Semi -Annual 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.
URS, 2013c. 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.
URS, 2013d. RE: Quarterly Status Report, Former Knollwood Gulf Station (BP 24163), 381
Knollwood Street, Winston-Salem, NC. Submitted to North Carolina Department of
tS 5-1

SECTIONFIVE References
Environment and Natural Resources, Division of Water Quality. URS Corporation -North
Carolina. December 11, 2013.
URS, 2014a. 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. February 14, 2014.
URS, 2014b. 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. May 20, 2014.
URS, 2014c. RE: Final 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. December 15, 2014.
USEPA, 2008. USEPA Contract Laboratory Program (CLP) National Functional Guidelines
(NFG) for Superfund Organic Methods Data Review and USEPA CLP NFG Inorganic
Superfund Data Review.
tS 5-2

TABLES

Table 1
Monitoring Well Construction Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
Well
Status
Well
Type
TOC
Elevation (2)
Total
Depth )
Well
Diameter (inches)
Screen
Interval (1)
Avg Screen
Elevation (2)
MW-3
In Use
Type II
99.03
20
2
NA NA
NA
MW-5
Abandoned
Type II
99.39
25.5
4
10.5 25.5
81.4
MW-5R
In Use
Type ll
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 111
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 ll
NS
20
2
10 20
NA
MW-14
In Use
Type ll
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. 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 DENR 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.
5. 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.
6. Monitoring wells MW-18 and MW-19 were installated on October 25, 2011.
NA = Not Applicable / Available
NS = Not Surveyed
TOC = Top of Casing
P:TP\Pr je \NC\24163, SZ, W-$ 381 Knollwood S-65.0 Deliv bles\5.1 Draft- Interim Deliverables\4.28 April 2015 GW Rq-\Tables\Tables, Appeadi-, avd Graphv july 13Wells Conetr (Table 1)6i2V20152:36 PM

Table 2
Summary of Groundwater Results
Compared to Groundwater Quality Standards,
April 23, 2015
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, NC
NC 21,
Groundwater
Sample ID:
MW-03
MW-05R
MW-08R
MW-18
MW-19
Standards +
Interim (IMACs)
Collection Date:
4/23/2015
4/23/2015
4/23/2015
4/23/2015
4/23/2015
Parameters
NCDENR 04/13
Units
Miscellaneous
Alkalinit , Total
NE
m
271
1740
442
1,120
120
Carbon dioxide
NE
1
m /L
296
1510
812
1,100
514
Sulfate
250
m /L
1 22.8
1 5,980
1 2,050
1 780
1 2,540
Notes:
GCL - Gross Contamination Level
J - Estimated value
mg/L - Milligrams per Liter
NE - Not established
SVOC - Semivolatile organic compounds
UJ - Not detected and the limit is estimated
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 Contract Laboratory Program (CLP) National Functional Guidelines (NFG) for Superfund Organic Methods Data
Review (EPA, June 2008).
Gross Contamination Levels, effective April 16, 2012, obtained from the NCDENR, Division of Waste Management, UST Section. A cell with a
bold border and green highlight indicates the sample concentration is greater than the GCL.
P:\BP\Projects\NC\24163, JZ, W-S, 381 Knollwood Street\5.0 Deliverables\5.1 Draft - Interim Deliverables\4.28 April 2015 GW Report\Tables\Table 2
6/22/2015, 2:38 PM

Table 3
Groundwater Field Parameter Data, April 23, 2015
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
Specific
DTW
pH
ORP
Temperature
DO
Well
Conductance
feet
(s.u.)
(mV)
(GC)
(MS/CM)
(mg/L)
MW-3
13.54
6.64
-71.9
18.64
0.679
3.31
MW-5R
13.69
8.64
-232.9
18.72
10.400
0.77
MW-8R
13.57
6.19
-79.4
18.12
3.939
1.33
MW-18
13.84
7.02
-187.4
19.15
3.242
1.82
MW-19
13.46
5.49
-77.4
18.81
4.276
1.21
Notes:
ORP - oxidation-reduction potential
DO - dissolved oxygen
s.u. - standard units
mV - millivolts
DC - degrees Celsius
mS/cm - milliSiemens per centimeter
mg/L - milligrams per liter
P:\BP\P jects\NC\24163, JZ, W-S, 381 Knollwood Street\5.0 Delivembles\5.1 Draft -Interim Delivembles\4.28 April 2015 GW Report\Tables\Tablea, Appendices, and Graphs july 13 1 of 1

FIGURES

a
SITE LOCATION
I:\BP\CADD URS\24163\24163—TOPO.DWG
SCALE IN FEET
QUADRANGLE LOCATION
0 2000
SOURCE: USGS 7.5' TOPOGRAPHIC QUADRANGLES
WINSTON-SALEM WEST, NC - DATED 1950, REVISED 1994
FIGURE 1. LOCATION MAP
FORMER BP STATION NO. 24163
WINSTON-SALEM, NORTH CAROLINA
Prepared tor:
BP PRODUCTS
PRO
DRAWN BY: TSH
RW NOR1H CAROl1N427560
DATE: 25AUG03
Fig.

O M.H.
LEGEND
o
•
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•
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D.P.
— PROPERTY LINE
• U.P.
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I
MW-5R
M -14
O
Y
W
1
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-'
FORMER PUM
NOTES:
4F,H,
L 11 IMW-8R
ISLAND (TYP) FORMER
M —6i
CANOPY
1. MONITORING WELL LOCATIONS ARE
APPROXIMATE.
PARKING
I
2. THE SITE IS A VACANT PARKING LOT.
I
ALL SITE FEATURES EXCEPT PARKING
--'
M
LOT RB D WAYS REPRESENT
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F I
SITE CDS
FORMER ARACD ER STI
M
pRM
S
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I
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0 30
•
0 0 0
o CANOPY
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�
m
O
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I
SCALE DESIGNED BY
AS SHOWN
DATE
Figure 2.Site
Map
C.B.
FORMER
VENT RISERS
CDPFIDENTIAL-ALL RIGHTS RESERVED -PROPERTY CF DRAWN BY
DATE
Former BP Station
No, 24163
PRL
05NOV12
Winston—Salem,
North Carolina
CHECKED BY
DATE
UNO,
S D H
05 N OV 12
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o M.H.
APPROVED BY
C K
DATE
05 N OV 12
38436693
FI
FIGURE-2 0
ROD NORTH CAROLINA 275fi0

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
LNAPL
Corrected
Well
Date
Elevation
LNAPL
Groundwater
Thickness
Groundwater
(1)
(feet btoc)
(feet bloc)
(feet)
Elevation (1)(2)
*
06/24/93
ND
13.89
0.00
85.14
*
08/23/94
ND
14.36
0.00
84.67
03/21/95
ND
13.58
0.00
85.45
*
08/05/96
ND
13.54
0.00
85.49
11/17/98
ND
14.09
0.00
84.94
*
06/19/01
ND
14.11
0.00
84.92
09/12/01
ND
14.41
0.00
84.62
*
12/27/01
ND
14.51
0.00
84.52
03/05/02
ND
14.29
0.00
84.74
05/13/03
ND
14.35
0.00
84.68
12/09/03
ND
13.63
0.00
85.40
03/23/06
ND
13.64
0.00
85.39
05/08/07
ND
13.40
0.00
85.63
05/14/08
ND
13.42
0.00
85.61
05/28/09
99.03
ND
13.31
0.00
85.72
05/27/10
ND
13.07
0.00
85.96
MW-3
10/31/11
ND
13.87
0.00
85.16
05/22/12
ND
13.55
0.00
85.48
06/14/12
ND
13.53
0.00
85.50
07/09/12
ND
13.98
0.00
85.05
08/14/12
ND
14.24
0.00
84.79
09/19/12
ND
14.08
0.00
84.95
12/05/12
ND
14.42
0.00
84.61
02/26/13
ND
13.55
0.00
85.48
05/31/13
ND
13.58
0.00
85.45
08/28/13
ND
13.57
0.00
85.46
11/07/13
ND
14.30
0.00
84.73
02/27/14
ND
13.28
0.00
85.75
06/02/14
ND
13.34
0.00
85.69
10/16/14
ND
14.18
0.00
84.85
04/23/15
ND
13.54
0.00
85.49
06/24/93
ND
13.51
0.00
85.88
08/23/94
ND
13.82
0.00
85.57
03/21/95
ND
13.71
0.00
85.68
08/05/96
ND
13.54
0.00
85.85
11/17/98
ND
14.08
0.00
85.31
06/19/01
NM
NM
NM
NM
09/12/01
ND
14.46
0.00
84.93
MW-5
12/27/01
99.39
14.51
15.07
0.56
84.73
03/05/02
14.45
14.88
0.43
84.82
05/12/03
NM
NM
NM
NM
12/09/03
13.18
13.60
0.42
86.10
03/23/06
ND
13.67
0.00
85.72
05/08/07
ND
13.45
0.00
85.94
05/14/08
ND
13.51
0.00
85.88
05/28/09
ND
13.39
0.00
86.00
05/27/10
ND
13.70
0.00
NM
10/31/11
ND
13.97
0.00
NM
05/22/12
ND
13.66
0.00
NM
06/14/12
ND
13.73
0.00
NM
07/09/12
ND
14.18
0.00
NM
08/14/12
ND
14.45
0.00
NM
09/19/12
NS
ND
14.35
0.00
NM
12/05/12
ND
14.68
0.00
NM
MW-5R
02/26/13
ND
13.89
0.00
NM
05/31/13
ND
13.77
0.00
NM
08/28/13
ND
13.83
0.00
NM
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
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Appendix A
Historical Groundwater Elevation Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
TOC
Depth to
Depth to
LNAPL
Corrected
Well
Date
Elevation
LNAPL
Groundwater
Thickness
Groundwater
(1)
(feet btoc)
(feet btoc)
(feet)
Elevation (1)(2)
*
06/24/93
ND
12.31
0.00
86.37
*
08/23/94
ND
12.61
0.00
86.07
03/21/95
ND
13.15
0.00
85.53
*
08/05/96
ND
12.39
0.00
86.29
11/17/98
ND
13.16
0.00
85.52
*
06/19/01
NM
NM
NM
NM
09/12/01
ND
13.51
0.00
85.17
*
12/27/01
ND
13.61
0.00
85.07
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
99.26
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
06/02/14
ND
13.35
0.00
85.91
08/23/94
ND
12.14
0.00
85.70
*
03/21/95
ND
12.02
0.00
85.82
*
08/05/96
ND
11.99
0.00
85.85
*
11/17/98
ND
12.53
0.00
85.31
*
06/19/01
NM
NM
NM
NM
*
09/12/01
ND
12.67
0.00
85.17
MW 8
*
12/27/01
97.84
14.47
15.03
0.56
83.26
*
03/05/02
12.42
12.60
0.18
85.38
05/12/03
NM
NM
NM
NM
12/09/03
13.32
13.56
0.24
84.47
03/23/06
ND
12.15
0.00
85.69
05/08/07
ND
11.90
0.00
85.94
05/14/08
ND
11.95
0.00
85.89
05/28/09
ND
11.70
0.00
86.14
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Appendix A
Historical Groundwater Elevation Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
TOC
Depth to
Depth to
LNAPL
Corrected
Well
Date
Elevation
LNAPL
Groundwater
Thickness
Groundwater
(1)
(feet btoc)
(feet btoc)
(feet)
Elevation (1)(2)
05/27/10
ND
12.97
0.00
NM
10/31/11
ND
13.34
0.00
NM
05/22/12
ND
13.69
0.00
NM
06/14/12
ND
14.94
0.00
NM
07/09/12
ND
14.08
0.00
NM
08/14/12
ND
14.29
0.00
NM
09/19/12
NS
ND
14.08
0.00
NM
12/05/12
ND
14.53
0.00
NM
MW-SR
02/26/13
ND
13.80
0.00
NM
05/31/13
ND
13.61
0.00
NM
08/28/13
ND
13.74
0.00
NM
11/07/13
ND
14.42
0.00
NM
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
06/24/93
NM
NM
NM
NM
08/23/94
NM
NM
NM
NM
03/21/95
ND
13.55
0.00
86.89
08/05/96
ND
13.64
0.00
86.80
11/17/98
ND
14.26
0.00
86.18
06/19/O1
ND
14.55
0.00
85.89
09/12/01
ND
14.81
0.00
85.63
12/27/O1
ND
14.85
0.00
85.59
03/05/02
ND
14.64
0.00
85.80
MW 14
100.44
05/12/03
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
06/24/93
NM
NM
NM
NM
08/23/94
NM
NM
NM
NM
03/21/95
ND
12.83
0.00
87.08
08/05/96
ND
12.77
0.00
87.14
11/17/98
ND
13.58
0.00
86.33
06/19/O1
ND
13.80
0.00
86.11
09/12/01
ND
14.18
0.00
85.73
12/27/O1
ND
14.29
0.00
85.62
03/05/02
ND
13.98
0.00
85.93
99.91
MW-15
05/12/03
NM
12.75
NM
87.16
12/09/03
ND
12.89
0.00
87.02
03/23/06
ND
13.14
0.00
86.77
05/08/07
ND
12.90
0.00
87.01
05/14/08
ND
13.12
0.00
86.79
05/28/09
ND
12.90
0.00
87.01
05/27/10
ND
12.25
0.00
87.66
10/31/11
ND
13.61
0.00
86.30
06/02/14
ND
12.82
0.00
87.09
10/16/14
ND
13.91
0.00
86.00
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Appendix A
Historical Groundwater Elevation Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
TOC
Depth to
Depth to
LNAPL
Corrected
Well
Date
Elevation
LNAPL
Groundwater
Thickness
Groundwater
(1)
(feet btoc)
(feet btoc)
(feet)
Elevation (1)(2)
06/24/93
NM
NM
NM
NM
08/23/94
NM
NM
NM
NM
03/21/95
ND
12.06
0.00
85.36
08/05/96
ND
12.09
0.00
85.33
11/17/98
ND
12.60
0.00
84.82
06/19/01
ND
12.74
0.00
84.68
09/12/01
ND
12.98
0.00
84.44
12/27/01
NM
NM
NM
NM
03/05/02
ND
12.83
0.00
84.59
MW-16
05/12/03
97.42
NM
NM
NM
NM
12/09/03
ND
12.13
0.00
85.29
03/23/06
ND
12.18
0.00
85.24
05/08/07
NM
NM
NM
NM
05/14/08
ND
12.03
0.00
85.39
05/28/09
ND
11.96
0.00
85.46
05/27/10
ND
11.69
0.00
85.73
10/31/11
ND
12.45
0.00
84.97
11/07/13
ND
12.88
0.00
84.54
06/02/14
ND
11.97
0.00
85.45
06/24/93
NM
NM
NM
NM
08/23/94
NM
NM
NM
NM
03/21/95
ND
14.42
0.00
85.58
08/05/96
ND
14.46
0.00
85.54
11/17/98
ND
14.91
0.00
85.09
06/19/01
ND
15.03
0.00
84.97
09/12/01
ND
15.28
0.00
84.72
12/27/01
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
10/31/11
ND
13.95
0.00
NM
05/22/12
ND
14.10
0.00
NM
06/14/12
ND
13.61
0.00
NM
07/09/12
ND
14.05
0.00
NM
08/14/12
ND
14.43
0.00
NM
09/19/12
ND
14.34
0.00
NM
12/05/12
NS
ND
14.62
0.00
NM
02/26/13
ND
14.67
0.00
NM
MW-18
05/31/13
ND
14.57
0.00
NM
08/28/13
ND
14.33
0.00
NM
11/07/13
ND
14.51
0.00
NM
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
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Appendix A
Historical Groundwater Elevation Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
Well
Date
TOC
Elevation
(1)
Depth to
LNAPL
(feet bloc)
Depth to
Groundwater
(feet bloc)
LNAPL
Thickness
(feet)
Corrected
Groundwater
Elevation (1)(2)
10/31/11
ND
13.75
0.00
NM
05/22/12
ND
13.37
0.00
NM
06/14/12
ND
13.39
0.00
NM
07/09/12
ND
13.89
0.00
NM
08/14/12
ND
14.13
0.00
NM
09/19/12
ND
14.02
0.00
NM
12/05/12
NS
ND
14.39
0.00
NM
02/26/13
ND
13.62
0.00
NM
MW 19
05/31/13
ND
13.47
0.00
NM
08/28/13
ND
13.56
0.00
NM
11/07/13
ND
14.25
0.00
NM
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
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.
- 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 NCDENR by others and is included only for ease of referece; 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.
LNAPL = Light non -aqueous phase liquid
ND = Not detected
NM - Not measured
NS = Not Surveyed
TOC = Top of casing
blue = 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.
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APPENDIX B
HISTORICAL GROUNDWATER ANALYTICAL SUMMARY

Appendix B
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
y enes
(Total)
MTBE
Sulfate
Carbon
dioxide
NC GCL:
5,000
84,500
260,000
85,500
20,000
NE
NE
Units:
1
1
/1
1
1
Mg/1
Mg/1
MW-03
5/13/2003
8.5
0.98 J
0.61 J
1.7 J
8
--
--
12/9/2003
47.4
14.3
1.9
1 8.1
37.3
1--
--
3/23/2006
4.5 J
< 0.5
< 0.5 UJ
< 1 UJ
5.5
--
--
5/8/2007
40.4
3.7
1.4
2 J
13.1
--
--
5/14/2008
4.3 J
< 0.8
< 0.7
< 0.8
14
--
--
5/28/2009
5.4
0.44 J
0.14 J
0.49 J
5.6
--
--
5/27/2010
0.44 J
< 0.11
0.3 J
< 0.32
4.8
--
--
10/31/2011
5.5
0.76
< 0.17 U1
0.38 J
19.1
1 8.4
405
5/22/2012
< 0.43 U
< 0.2
< 0.2
< 0.52
4.6
15.3
378
6/14/2012
12.1
6.7
0.72
4.7
15.4
6.6 J
344
7/9/2012
2.2
1.6
2.6
3
14.7
9.9
393
8/14/2012
2
2.1
< 0.13
0.4 J
17.9
3.6
303
9/19/2012
2.7
0.66
< 0.13
0.33 J
19.8
2.8
459
12/5/2012
11.3
1.2
0.43 J
1.1 J
19.3
0.78 J
377
2/26/2013
0.23 J
< 0.1
< 0.1
< 0.22
5.4
32.6
338
5/31/2013
0.32 J
< 0.1
< 0.1
< 0.22
10.5
17.9
334
8/28/2013
3.6
0.53
0.12 J
0.31 J
10.3
21.9
457
11/7/2013
4.3
0.27 J
0.13 J
< 0.22
10
21.7
536
2/27/2014
< 0.1
< 0.1
< 0.1
< 0.2
1.3
42.2
198
6/3/2014
0.48 J
0.15 J
< 0.1
< 0.2
3.1
-
--
10/16/2014
--
--
--
--
--
18.0
372
4/23/2015
--
--
--
--
--
22.8
296
MW-05
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 (')
71400
1,680
20,100
9,290
9,360
--
-
5/14/2008
10,000
2,100
29,000
12,000
18,000
--
--
5/14/2008 (')
10,000
2,100
30,000
12,000
18,000
--
-
5/28/2009
7,390
2,330
25,700
13,400
6,920
--
--
5/28/2009 (')
6,510
1 2,240
22,100
1 12,900
6,510
--
-
MW-05R
5/27/2010
6,610
2,810
24,300 J
15,700
4,330
--
--
5/27/2010 (')
6,090
2,380
30,100 J
13,300
4,250
--
--
10/31/2011
7,960
2,660
28,000
13,800
3,830
< 1
< 5
10/31/2011
8,360
2,870
24,600
14,800
4,070
1--
-
5/22/2012
7,980 1
3,470
32,200
19,200
3,820
< 5
179
6/15/2012 (2)
244
227
1,190
1,120
36.9
6,070
1,820
7/9/2012
336 J
481 J
2,010 J
2,400 J
48.4 J
6,470
2,620
8/14/2012
201
283
1,050
1,300
48.5
14,700
4,190
9/19/2012
158
181
650
883
114
19,000
3,280
12/5/2012
754
505
2,220
2,380
1,160
13,600
1,840
2/26/2013
1,360
878
3,520
3,940
1,660
8,520
1,530
5/31/2013
1,410
1,380
5,930
6,220
1,150 J
4,680
1,560
8/28/2013
165
178
489
1,380
417
13,900
1,590
11/7/2013
214
131
331
969
651
14,400
1,570
2/27/2014
142
1 177
328
1,060
1 240
2,990
807
P:\BP\Projects\NC\24163, JZ, W-S, 381 Knollwood Street\5.0 Deliverables\5.1 Draft - Interim Deliverables\4.28 April 2015 GW Report\Appendices\Appendix B
6/2/2015, 7:55 AM

Appendix B
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
y enes
(Total)
MTBE
Sulfate
Carbon
dioxide
NC GCL:
5,000
84,500
260,000
85,500
20,000
NE
NE
Units:
1
1
/1
1
1
Mg/1
Mg/1
MW-05R
6/2/2014
256
436
1040
2520
519 J
--
--
10/16/2014
--
-
--
--
--
9,950
1,390
4/23/2015
--
--
--
--
--
5,980
1,510
MW-06
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
--
--
5/14/2008
< 0.5
< 0.8
< 0.7
< 0.8
< 0.5
--
--
5/28/2009
< 0.06
< 0.05
< 0.06
< 0.14
0.17 J
--
--
5/27/2010
< 0.11
0.13 J
0.38 J
0.46 J
< 0.12
-
--
10/31/2011
8.7 J
11.7 J
27.5 J
132 J
< 0.26 UJ
131
2,130
6/2/2014
17.6 J
59.4 J
31.6 J
99.4 J
783 J
-
--
MW-06I
5/12/2003
< 0.5
< 0.5
< 0.5
1.11
< 0.5
--
--
12/9/2003
< 2.5
< 2.5
< 2.5
< 5
< 2.5
--
--
3/23/2006
49.7
18.9
48.7
443
3,560
--
-
5/8/2007
< 25
< 25
< 25
< 50
6,910
--
--
5/14/2008
5.2 J
< 2
< 1.8
< 2
3,400
-
--
5/28/2009
2.5
< 0.05
< 0.06
< 0.14
1,150
--
--
5/27/2010
1.6 J
< 1.1
< 1.1
< 3.2
492
--
--
10/31/2011
0.41 J
< 0.36
< 0.32
< 0.75
122
< 1
76.1
6/2/2014
< 0.1
< 0.1
< 0.1
< 0.2
3.3
--
--
MW-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
1--
--
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
--
--
10/31/2011
8,000
3,180
32,100
17,200
3,170
< 1
< 5
5/22/2012
8,270
3,360
36,400 J
17,800
3,920
< 5
119
6/15/2012 (2)
726
47 J
760
242 J
96.3 J
4,760
22,200
7/9/2012
4,540 J
1,870 J
17,100 J
10,800 J
1,530 J
6,570
4,500
8/14/2012
4,370
1,610
19,300
8,780
2,000
7,010
1,560
9/19/2012
4,780
1,800
20,900
10,400
2,600
6,700
1,100
12/5/2012
7,760
2,440
31,900
13,800
4,560
2,410
635
2/26/2013
7,310
2,480
30,500
13,400
4,530
959
590
5/31/2013
6,540
3,040
30,500
12,500
4,200
439
437
8/28/2013
1,600
628
5,390
3,990
1,380
4,770
703
11/7/2013
1,130
329
2,440
1,830
1,770
7,460
766
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 (t)
1,540
1 556 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
P:\BP\Projects\NC\24163, JZ, W-S, 381 Knollwood Street\5.0 Deliverables\5.1 Draft - Interim Deliverables\4.28 April 2015 GW Report\Appendices\Appendix B
6/2/2015, 7:55 AM

Appendix B
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
y enes
(Total)
MTBE
Sulfate
Carbon
dioxide
NC GCL:
5,000
84,500
260,000
85,500
20,000
NE
NE
Units:
1
1
/1
1
1
Mg/1
Mg/1
MW-14
5/12/2003
< 0.5
< 0.5
< 0.5
< 1
0.52 J
--
--
12/9/2003
< 0.5
< 0.5
< 0.5
1 < 1
5.9
--
--
3/23/2006
< 0.5
< 0.5
< 0.5
< 1
< 0.5
--
--
5/8/2007
< 0.5
< 0.5
< 0.5
< 1
< 0.5
--
--
5/14/2008
< 0.5
< 0.8
< 0.7
< 0.8
< 0.5
--
--
5/28/2009
< 0.06
< 0.05
0.077 J
< 0.14
< 0.06
-
--
5/27/2010
< 0.11
< 0.11
< 0.11
< 0.32
< 0.12
--
--
10/31/2011
<0.13
<0.15
<0.42U
<0.3
<0.13
43.2
<5
6/3/2014
< 0.1
< 0.1
< 0.1
1 < 0.2
< 0.1
--
--
MW-15
3/23/2006
0.63 J
2.1
< 0.5
18.6
1.6
-
--
5/8/2007
< 0.5
< 0.5
< 0.5
2.2 J
< 0.5
--
--
5/14/2008
< 0.5
< 0.8
< 0.7
3.7 J
< 0.5
--
--
5/27/2010
< 0.11
< 0.11
< 0.11
< 0.32
< 0.12
--
--
10/31/2011
<0.13
<0.15
<0.13
<0.3
<0.13
<1
<5
6/3/2014
< 0.1
< 0.1
< 0.1
1 < 0.2
< 0.1
--
--
10/16/2014
<0.1
<0.1
<0.1
<0.2
<0.1
-
--
MW-16
3/23/2006
< 2.5
90.8
15.8
836
2.8 J
--
--
5/14/2008
< 0.5
160
15
1,600
4.1 J
--
--
5/27/2010
3.6
54.7 J
5.1
525 J
1.3
-
--
10/31/2011
< 0.65
17.2
< 1.4 U
321
< 0.65
194
< 5
11/7/2013
--
--
--
1--
--
55.4
< 5
6/3/2014
< 0.1
25
0.92
417 J
< 0.1
--
--
MW-17
5/13/2003
57.7
< 0.5
< 0.5
< 1
69
--
--
5/13/2003
40.8
< 0.5
< 0.5
< 1
63.3
--
--
12/9/2003
6.6
0.65 J
< 0.5
< 1
80.6
--
--
3/23/2006
1
< 0.5
< 0.5
< 1
58.9
--
--
5/8/2007
< 0.5
< 0.5
< 0.5
< 1
17.4
--
--
5/14/2008
3.7 J
< 0.8
< 0.7
< 0.8
19
--
--
5/28/2009
7
< 0.05
0.076 J
< 0.14
14.5
--
--
5/27/2010
5.7
< 0.11
< 0.11
< 0.32
12.4
--
--
10/31/2011
0.51
0.16 J
< 0.81 U
0.57 J
8.9
< 1
422
6/3/2014
< 0.1
< 0.1
< 0.1
< 0.2
4.1
--
--
MW-18
10/31/2011
3,140
998
11,100
8,950
1,140
1 8.2
446
5/22/2012
2,280
2,790
18,200
12,000
789
< 5
307
6/15/2012 (21
373
910
4,800
3,910
114
10,600
3,410
7/9/2012
1,730 J
2,170 J
15,000 J
9,750 J
676 J
2,300
835
8/14/2012
3,020
2,990
24,400
12,800
1,090
758
580
9/19/2012
3,190
3,090
22,600
14,000
1,240
322
542
12/5/2012
3,370
2,970
20,100
12,800
1,380
32.2
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
8/28/2013
182
368
730
1,660
139
7,850
2,230
11/7/2013
1,140
727
4,910
3,250
694
2,640
1,370
2/27/2014
16.6
109
20.2
45.8
18.5
4,310
1,270
6/2/2014
26.2 J
125 J
37.5 J
31.6 J
37.4 J
--
--
10/16/2014
359
388
244
138
364
11540
513
4/23/2015
--
-
--
--
--
780
1,100
P:\BP\Projects\NC\24163, JZ, W-S, 381 Knollwood Street\5.0 Deliverables\5.1 Draft - Interim Deliverables\4.28 April 2015 GW Report\Appendices\Appendix B
6/2/2015, 7:55 AM

Appendix B
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
y enes
(Total)
MTBE
Sulfate
Carbon
dioxide
NC GCL:
5,000
84,500
260,000
85,500
20,000
NE
NE
Units:
1
1
/1
1
1
mg/1
m 1
MW-19
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
1 < 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
1 169
503
5/31/2013
1,830
894
8,820
5,250
3,120
1,530
606
8/28/2013
2,710 J
1,190 J
13,100
7,420 J
3,240 J
2,660
525
11/7/2013
2,020
984
9,850
5,620
2,260
2,890
255
2/27/2014
2,550
1,400
10,900
7,880
3,320
2,790
322
6/2/2014
2,370
1,260
11,900
7,260
2,830
--
-
10/16/2014
--
--
--
--
--
2,340
632
4/23/2015
--
--
--
--
--
2,540
514
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
µg/1- Micrograms per Liter
GCL - Gross Contamination Level
J - Estimated value
mg/l - Milligrams per Liter
MTBE - Methyl tert-Butyl Ether
NE - Not established
U - Not present above the associated level; blank contamination exists
UJ - Not detected and the detection limit is estimated
Bold cell with a green highlight indicates GCL exceedance.
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.
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 Contract Laboratory Program (CLP) National
Functional Guidelines (NFG) for Superfund Organic Methods Data Review (EPA, June 2008) and USEPA CLP
NFG for Inorganic Superfund Data Review (USEPA, January 2010).
Gross Contamination Levels, effective April 16, 2012, obtained from the NCDENR, Division of Waste
Management, UST Section.
P:\BP\Projects\NC\24163, JZ, W-S, 381 Knollwood Street\5.0 Deliverables\5.1 Draft - Interim Deliverables\4.28 April 2015 GW Report\Appendices\Appendix B
6/2/2015, 7:55 AM

APPENDIX C
LABORATORY ANALYTICAL REPORT

e-Hardcopy 2.0
Automated Report
Southeast
■ ,o,.ccuTEST
L n Q O R A T 0 R f E S
am I
Technical Report for
Atlantic Richfield Company
URSNCM:S/S 24163: 381 Knollwood St, Winston-Salem, NC
24163-38436889-104080
Accutest Job Number: FA23838
Sampling Date: 04/23/ 15
Report to:
OM, INC.
[e-mail]
TTN: Kelly Brannigan
Total number of pages in report: 23
�e ACC%.
Test results contained within this data package meet the requirements
of the National Environmental Laboratory Accreditation Program
and/or state specific certification programs as applicable.
07
Norm Farmer
Technical Director
Client Service contact: Heather Wandrey 407-425-6700
Certifications: FL (E83510), LA (03051), KS (E-10327), IA (366), IL (200063), NC (573), NJ (FL002), SC (96038001)
DoD ELAP (L-A-B L2229), CA (2937), TX (T104704404), PA (68-03573), VA (460177),
AK, AR, GA, KY, MA, NV, OK, UT, WA
This report shall not be reproduced, except in its entirety, without the written approval of Accutest Laboratories.
Test results relate only to samples analyzed.
Southeast ° 4405 Vineland Road • Suite C-15 • Orlando, FL 32811 • tel: [phone] ° fax: [phone] ° http://www.accutest.com
1 of 23
Accutest Laboratories is the sole authority for authorizing edits or modifications to this M4I.MMU-rE0-r
document. Unauthorized modification of this report is strictly prohibited. FA23838

E ACCUTEST
L A B a RAT O R IF S
May 13, 2015
Ms. Martha Meyers -Lee
AECOM/URS
1600 Perimeter Park Drive
Morrisville, NC
RE: Accutest job FA23838 Re -Issue
Dear Ms. Meyers -Lee,
The final report for job number FA23838 has been edited to reflect requested corrections.
These edits have been incorporated into the revised report.
The report has been revised to correct a comment in the CN for the CO2.
Accutest apologies for any inconvenience this may have caused. Please feel free to contact
us if we can be of further assistance.
Sincerely,
Accutest Laboratories, SE
Florida ♦ 4405 Vineland Road ♦ Suite C-15 ♦ Orlando, FL 32811 ♦ tel: [phone] ♦ fax: [phone] ♦ htpp:hwww.accutest.corrn
■R 2 of 23
M ACCUTEST.
FA23838 "tl`pnTtl""0

Sections:
Table of Contents
6e
Section1: Sample Summary...................................................................................................
4
Section 2: Case Narrative/Conformance Summary..............................................................
5
Section3: Summary of Hits....................................................................................................
8
Section 4: Sample Results........................................................................................................
9
4.1: FA23838-1: MW-3........................................................................................................
10
4.2: FA23838-2: MW-5R.....................................................................................................
11
4.3: FA23838-3: MW-8R.....................................................................................................
12
4.4: FA23838-4: MW-18......................................................................................................
13
4.5: FA23838-5: MW-19......................................................................................................
14
Section5: Misc. Forms............................................................................................................
15
5.1: Chain of Custody...........................................................................................................
16
Section 6: General Chemistry - QC Data Summaries..........................................................
19
6.1: Method Blank and Spike Results Summary..................................................................
20
6.2: Duplicate Results Summary..........................................................................................
21
6.3: Matrix Spike Results Summary.....................................................................................
22
6.4: Matrix Spike Duplicate Results Summary....................................................................
23
■R 3 of 23
A U-rEST.
FA23838 "tl'pn tl"i0

Accutest LabLink@159684 08:24 14-May-2015
Sample Summary
Atlantic Richfield Company
Job No: FA23838
URSNCM: S/S 24163: 381 Knollwood St, Winston-Salem, NC
Project No: 24163-38436889-104080
Sample
Collected
Matrix
Client
Number
Date Time By
Received Code Type
Sample ID
FA23838-1 04/23/15 11:37 JM 04/24/15 AQ Ground Water MW-3
FA23838-2 04/23/15 09:46 JM 04/24/15 AQ Ground Water MW-5R
FA23838-3 04/23/15 08:55 JM 04/24/15 AQ Ground Water MW-8R
FA23838-4 04/23/15 10:40 JM 04/24/15 AQ Ground Water MW-18
FA23838-5 04/23/15 08:05 JM 04/24/15 AQ Ground Water MW-19
■w 4 of 23
E AMMU-rEO-r
FA23838 "O`nnitl"10

SAMPLE DELIVERY GROUP CASE NARRATIVE
Client: Atlantic Richfield Company Job No: FA23838
Site: URSNCM: S/S 24163: 381 Knollwood St, Winston-Salem, NC Report Date 4/29/2015 9:24:32 AM
5 Samples were collected on 04/23/2015 and were received at Accutest SEon 04/24/2015 properly preserved, at 2.6 Deg. C and intact.
These Samples received an Accutest job number of FA23838. 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.
Wet Chemistry By Method EPA 300/SW846 9056A
Matrix: AQ Batch ID: GP25875
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) JB92931-13AAMS, JB92931-13AAMSD were used as the QC samples for Sulfate.
Wet Chemistry By Method SM2320 B-11
Matrix: AQ Batch ID: GN66068
All samples were analyzed within the recommended method holding time.
All method blanks for this batch meet method specific criteria.
Sample(s) FA23838-3DUP was used as the QC samples for Alkalinity, Total as CaCO3.
Matrix: AQ
Batch ID: GN66069
All samples were analyzed within the recommended method holding time.
All method blanks for this batch meet method specific criteria.
Sample(s) FA23664-13DUP was used as the QC samples for Alkalinity, Total as CaCO3.
Accutest Laboratories Southeast (ALSE) certifies that this report meets the project requirements for analytical data produced for the
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 responsible for any assumptions of data quality if partial data packages are used
Narrative prepared by:
Date: April 29, 2015
Lovelie Metzgar, QA Officer (signature on file)
Narrative revised by:
Date: April 29, 2015
Svetlana Izosimova, QA Officer (signature on file)
Wednesday, April 29, 2015 Page 1 of 1
■R 5 of 23
FA23838 "tl`pnTtl""0

Laboratory Report Glossary
Client Sample ID: Normally refers to a point of collection — a monitoring well, discharge outfall, treatment facility
intake, soil core grid location and depth, or any other identification client assigns to a sample.
Lab Sample ID: Letter prefix identifies one of Accutest laboratories and the rest is a consecutive number of the job (or
SDG) received. Number after dash is a sample number and it is unequivocally linked in the LIMS to the Client Sample
ID (see above).
Matrix (Matrix Code):
• AQ-Water Samples
• SO- Soil/Solid Samples
• LIQ- Non -Water Liquid Samples
• OIL- Oil Samples
Matrix Type:
• SW for Surface Water
• SO for Soil/Sediment
• GW for Ground Water
• DW for Drinking Water
All available definitions are found on Chain of Custody form.
Deg. C: Degrees Celsius, measurement of temperature.
Method: Analytical and preparation methods used for the analysis, with the version or revision identified.
Date Sampled: This information is entered from Chain of Custody at the time of login for every sample.
Date Received: When the job was received by Accutest Laboratories.
Percent Solids: Applicable only to SO matrix. For other matrices this field defaults to "n/a".
Run #: Provides information how many attempts were made in the analysis of the sample. LIMS can merge information
from several attempts and lists all of them, including dilution, confirmation, etc. #1 designation is assigned to the
analytical run with majority of analytes reported from it, not necessarily in chronological order.
File ID: Actual instrument data acquisition file that produced the final result. Letter prefix identifies the instrument; the
rest is a consecutive injection number for that instrument.
DF (Dilution Factor): Most common reasons are either to fit into the range of the calibration, or alleviate matrix
interference. DF other than 1 are accompanied with a comment at the end of the sample report.
Analyzed: Date of analysis.
By: Field Technician or Analyst uniquely identified by initials.
Prep Date: Date of sample preparation. If hold time is 72 hours or less, time of preparation is also indicated.
Prep Batch: Letter prefix OP followed by a consecutive number. For VOC analysis preparation happens at the time of
analysis, therefore analytical batch and preparation batch are the same. Size of prep batch is limited to 20 field samples
of similar matrix and the entire batch should be completed within 12 hour time.
Analytical Batch: Letter prefix identifies the instrument and is followed by a consecutive number. Not limited by a
number of samples.
Initial Weight or Initial Volume: Raw sample size used for preparation.
Final Volume: Final volume of extract. If different from method -prescribed volume, reasons are reflected in the
comments at the end of the report form.
CAS Number: Chemical Abstracts Service (CAS), a division of the American Chemical Society.
Compound: Most commonly used names of chemical compounds.
Result: Depending on project requirements, this field could be set up as text, such as ND (for Non Detected) or a
number. The number may be reported with a qualifier.
MDL (Method Detection Limit): This value is defined as 99% probability that analyte above this concentration is
positively (qualitatively) identified.
RL (Reporting Limit): This value is supported by the low calibration standard and defines lowest point of quantitative
identification of analyte.
DL (Detection Limit): The smallest analyte concentration that can be demonstrated to be different from zero or a blank
concentration with 99% confidence. At the DL, the false positive rate (Type I error) is 1%.
LOD (Limit of Detection): The smallest concentration of a substance that must be present in a sample in order to be
detected at the DL with 99% confidence. At the LOD, the false negative rate (Type II error) is 1%.
LOQ (Limit of Quantitation): The smallest concentration that produces a quantitative result with known and recorded
precision and bias.
■R 6 of 23
FA23838 "tl`pnTtl""0

Units: ug/l (micrograms per liter) for aqueous samples and ug/kg (micrograms per kilogram) for solids (or ppb — parts
per billion). The units could be set according to project or state -specific requirements, such as mg/1(milligrams per liter),
or mg/kg (milligrams per kilogram).
Qualifiers (Q): Definitions of most often used qualifiers are found at the bottom of each result page. Applied depending
on the program — state -specific (Florida A.C. 62-160), CLP-like, AFCEE, DOD QSM, etc.
Tentatively Identified Compound (TIC): Used when client requests a search for analytes that are not part of
instrument calibration. Unknown peaks are compared with published spectral libraries and best match is reported as TIC.
Surrogate (S1, S2, S3 etc.): are positive controls that are used in most organics methods to ascertain preparation
efficiency and matrix effect in individual samples. These chemicals mimic common method constituents but are unlikely
to be found in real samples. Recoveries can be reported for every analytical run used in the analysis.
IS (Internal Standard IS1, IS2, IS3, etc): quantitative reference used to adjust for instrument performance
fluctuations.
Area (of chromatographic peak): signal intensity directly related to compound concentration.
RT (Retention Time): time required for analyte to traverse the length of analytical column. Used for compound
identification.
ICAL (Initial Calibration): Must pass calibration criteria established by method.
ICV (Independent Calibration Verification): Used to verify ICAL preparation and concentration of calibration points.
CCV (Continuing Calibration Verification): Used to assess calibration status of the instrument and must recover
within established acceptance criteria.
MB (Method Blank): is a negative batch control. MB is an aliquot of matrix free of analyte of interest (either ASTM
Type II water or appropriate solid substance) that is put through all the preparation and possible clean-up steps alongside
investigative (field) samples. MB should be free of interferences above a set level.
BS (Blank Spike, Laboratory Fortified Blank - LFB, Laboratory Control Sample - LCS): is a positive control used
to determine method accuracy - in clean matrix, i.e. matrix free of analytes of interest.
BSD (Blank Spike Duplicate): Used to assess recovery reproducibility - method precision — per analytical method
requirement. %Recovery and Relative Percent Difference (%RPD) are compared with the established acceptance criteria.
MS and/or MSD (Matrix Spike and Matrix Spike Duplicate): positive batch controls which indicate matrix effect on
the precision and accuracy of the method in given sample matrix. Results are expressed in %Recovery and Relative
Percent Difference (%RPD), and compared with the established acceptance criteria.
DUP (Matrix Duplicate): Positive batch control, a way of assessing laboratory's precision; however, the composition
of the samples is unknown and may not yield meaningful results.
REC (Recovery in Percent): expresses method accuracy.
RPD (Relative Percent Difference): expresses method precision.
Limits: Recovery limits for surrogates and spikes
■R 7 of 23
FA23838 "tl`pnTtl""0

Summary of Hits Page 1 of I
Job Number:
FA23838
Account:
Atlantic Richfield Company
Project:
URSNCM:S/S 24163: 381 Knollwood St, Winston-Salem, NC
Collected:
04/23/ 15
Lab Sample ID Client Sample ID Result/
Analyte Qual RL MDL Units Method
FA23838-1 MW-3
Alkalinity, Total as CaCO3
271
5.0
2.5
mg/l
SM2320 B-11
Carbon Dioxide
296
5.0
5.0
mg/l
SM45000O2 D-11
Sulfate
22.8
2.0
0.60
mg/1
EPA 300/SW846 9056A
FA23838-2 MW-5R
Alkalinity, Total as CaCO3
1740
25
13
mg/l
SM2320 B-11
Carbon Dioxide
1510
5.0
5.0
mg/l
SM45000O2 D-11
Sulfate
5980
200
60
mg/l
EPA 300/SW846 9056A
FA23838-3 MW-8R
Alkalinity, Total as CaCO3
442
5.0
2.5
mg/1
SM2320 B-11
Carbon Dioxide
812
5.0
5.0
mg/l
SM45000O2 D-11
Sulfate
2050
100
30
mg/l
EPA 300/SW846 9056A
FA23838-4 MW-18
Alkalinity, Total as CaCO3
1120
25
13
mg/l
SM2320 B-11
Carbon Dioxide
1100
5.0
5.0
mg/l
SM45000O2 D-11
Sulfate
780
50
15
mg/l
EPA 300/SW846 9056A
FA23838-5 MW-19
Alkalinity, Total as CaCO3
120
5.0
2.5
mg/l
SM2320 B-11
Carbon Dioxide
514
5.0
5.0
mg/l
SM45000O2 D-11
Sulfate
2540
100
30
mg/l
EPA 300/SW846 9056A
■w 8 of 23
E AMMU-rEO-r
FA23838 "O`nnitl"10

Section 4
. Southeast
w ACCUTEEBT
L A 9 4 R A 7 0 R f R S
Sample Results
Report of Analysis
■■ 9 of 23
M ACCU-rEO-r
FA23838 ""`nnitlpi°

Accutest LabLink@159684 08:24 14-May-2015
Report of Analysis
Client Sample ID: MW-3
Lab Sample ID: FA23838-1 Date Sampled: 04/23/15
Matrix: AQ - Ground Water Date Received: 04/24/15
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 l
Result
RL
MDL
Units
DF
Analyzed By Method
271
5.0
2.5
mg/1
1
04/25/15 12:20 TF SM2320 B-11
296
5.0
5.0
mg/l
1
04/25/15 15:00 TF SM4500002 D-11
22.8
2.0
0.60
mg/1
1
04/25/15 14:51 VK EPA 300/SW846 9056A
RL = Reporting Limit
MDL = Method Detection Limit
U = Indicates a result < MDL
B = Indicates a result > = MDL but < RL
■ 10of23
N AMMU-rEO-r
FA23838 "O`nnitl"10

Accutest LabLink@159684 08:24 14-May-2015
Report of Analysis
Client Sample ID: MW-5R
Lab Sample ID: FA23838-2 Date Sampled: 04/23/15
Matrix: AQ - Ground Water Date Received: 04/24/15
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 l
Result
RL
MDL
Units
DF Analyzed By Method
1740
25
13
mg/1
1 04/25/15 11:00 TF SM2320 B-11
1510
5.0
5.0
mg/l
1 04/25/15 15:00 TF SM4500002 D-11
5980
200
60
mg/l
100 04/25/15 15:07 VK EPA 300/SW846 9056A
RL = Reporting Limit
MDL = Method Detection Limit
U = Indicates a result < MDL
B = Indicates a result > = MDL but < RL
■ 11 of 23
N AMMU-rEO-r
FA23838 "O`nnitl"10

Accutest LabLink@159684 08:24 14-May-2015
Report of Analysis
Client Sample ID: MW-8R
Lab Sample ID: FA23838-3 Date Sampled: 04/23/15
Matrix: AQ - Ground Water Date Received: 04/24/15
Percent Solids: n/a
Project: URSNCM:S/S 24163: 381 Knollwood St, Winston-Salem, NC
General Chemistry
Analyte
Result
Alkalinity, Total as CaCO3
442
Carbon Dioxide
812
Sulfate
2050
RL = Reporting Limit
MDL = Method Detection Limit
Page 1 of l
RL
MDL
Units
DF
Analyzed By Method
5.0
2.5
mg/1
1
04/25/15 12:20 TF SM2320 B-11
5.0
5.0
mg/l
1
04/25/15 15:00 TF SM4500002 D-11
100
30
mg/l
50
04/25/15 15:23 VK EPA 300/SW846 9056A
U = Indicates a result < MDL
B = Indicates a result > = MDL but < RL
■ 12of23
N AMMU-rEO-r
FA23838 "O`nnitl"10

Accutest LabLink@159684 08:24 14-May-2015
Report of Analysis
Client Sample ID: MW-18
Lab Sample ID: FA23838-4 Date Sampled: 04/23/15
Matrix: AQ - Ground Water Date Received: 04/24/15
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 l
Result
RL
MDL
Units
DF
Analyzed By Method
1120
25
13
mg/1
1
04/25/15 11:00 TF SM2320 B-11
1100
5.0
5.0
mg/l
1
04/25/15 15:00 TF SM4500002 D-11
780
50
15
mg/1
25
04/25/15 15:39 VK EPA 300/SW846 9056A
RL = Reporting Limit
MDL = Method Detection Limit
U = Indicates a result < MDL
B = Indicates a result > = MDL but < RL
■ 13of23
N AMMU-rEO-r
FA23838 "O`pnitl"10

Accutest LabLink@159684 08:24 14-May-2015
Report of Analysis
Client Sample ID: MW-19
Lab Sample ID: FA23838-5 Date Sampled: 04/23/15
Matrix: AQ - Ground Water Date Received: 04/24/15
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 l
Result
RL
MDL
Units
DF
Analyzed By Method
120
5.0
2.5
mg/1
1
04/25/15 12:20 TF SM2320 B-11
514
5.0
5.0
mg/l
1
04/25/15 15:00 TF SM4500002 D-11
2540
100
30
mg/l
50
04/25/15 15:55 VK EPA 300/SW846 9056A
RL = Reporting Limit
MDL = Method Detection Limit
U = Indicates a result < MDL
B = Indicates a result > = MDL but < RL
■ 14of23
N AMMU-rEO-r
FA23838 "O`nnitl"10

Section 5
Southeast
■ ,o,.ccuTEST
L A E3 0 R A 7 O R f E S
Misc. Forms
Custody Documents and Other Forms
Includes the following where applicable:
• Chain of Custody
■w 15 of 23
E AMMU-rE^.ST.
FA23838 "O`nnitl"10

by Laboratory Management Program LaMP Chain of Custody RecorFAjrm 6P Site Node Path: 24163 Req Due Date [mrnlddlyy]: 10U-6u8,esadaya nwt nlwgl Rush TAT: Yes— No %
BP Facility No7 Lab Work alder Number:
ad Now; Accutast-Southeast
Facility Address: 381 Krlollwood Orryo
CansuliapWM tmcor t1RS Carperwhan- Forth Carolina
-sib Addmsa: 4406 Vlrlalend Road, 9ulte C-5, Odandp. FL =11
City, Blale, Ap Code; Winston Salem, NC
Consultanl/CoN aCWr Prot No: 24163.38436e89.104000
Ah PAt: Neathar WanNey
Lead Regulmory Agency. NCdPNR owu . UST SecElnn
Address: IEOO Parimalar Park Road. SWIo 400, ?,"rlmulla. NC: 27 W
at. Phvna; 407-426-07DO
CGLfomie Giohal 10 No.:
:WtaJillCpnlfeplpr PM: Jason 21nna
,all Stuppfng Acenu ACCulasl: 1823-20165
Enrpa PFOP0001 NO: IX174aF-001 1
plhow 91"151-1m Finad; NCChemirTs�ws.com
at. Bowe Order No; 55aU
Apso=Etl U Abdo: Prwaiun X OOC-Bl1 _ CaGRM _
Email. EOO To: NCChami&lsQur&com +b.m�aevw�no.
DOW Milo;
Sm9e: 40 Acuvlty. 80 - Operate I Project Spa nd
Inwlue To: BP contmectof _ [L
iP PrgaCl Ater Greg Frlsah
Matrix
No. Contafeeis f Preaervativu
Requested Analyzes
Rapon Type 3 QC Level
3P PM Phone, 216 OeO232
a
Standard �
Full Oata p4cka9e �—
iP FAA EmaA; Grag.Frbwd by-p
Lab
No.
Sample Description
Date
Time
Gommenta
Noe: n earnaa n w4_wd. rnlraw
SampW n mmmer& are akVWe k. and
ag p"rd aompn
137
x
x1
1
1
x
15
- R
U SQ5
1
Zx
$amp4e&Nama: Jerry Mao Wwakt
Relinqulshed By IAFf!IiatAon
Date
Time
Ac ceptad By ANil WV on
Date
Trme
32mptarp Canpeny. LIRS Cprpolailon - Nonh C,ardha
—
�V
-�}
3hpmanlM61nvd: Fade( WData: _.13'
o Y�
Sh4 m 1 Trosking No:
Spacial Instructions: Rafar t0 attached Sample KH Request for anaiytipal *cope at work.
Contact Martha Mwyerr•Lae (412 461.16111) r.g.rding all aam9a r 1pt and analytlaal non-canfa mancg Isoups.
THJS I,INE - UV8 USE ONLY: Custody 8eala In Plscar Yea 1 No I Temp Blanku Yes r No I cooler Tamp .. R. -ipk EPIC Tdp Blank: Yes 1 W I MSIMSO Sampie Su6miued: Yen, No
Ertps Work Release WR288209 BP Remedlalm Management COC - Effeelrva calm; Augusl23, 2011• June 30, 2012 00 tamp cDC Rev- 7, Aug 4 7e1+
FA23838: Chain of Custody
Page 1 of 3
■R 16 of 23
M A U-rEST.
FA23838 "tl`pnTtl""0

. ACCUTEST LABORATORIES SAMPLE RECEIPT CONnRMATION
ACCUTEST'S JOB NT FMBER: CLIENT: PROJECT:
DATEITIME RECEIVED: • ti --[ 6 (MWDDIYY E4:00) NUMBER OF COOLERS RECEVIE+D:�� _
ME7 HOD OF DELIVERY:U DEX UPS ACCUTEST COURIER DELIVERY OTHER:
AIRBILL NUMBERS: 7 Ca f L4
COOLER EffORMATION
CUSTODY SEAL NOT PRESENT OR NOT INTACT
CHAIN OF CUSTODY NOT RECEIVED (COC)
ANALYSIS REQUESTED IS UNCLEAR OR MISSING
SAMPLE DATES OR TIMES UNCLEAR OR MISSING
TEMPERATURE CRITERIA NOT MET
TRIP BLANIx INFORMATION
BLANK PROVIDED
TRIP BLANK NOT PROVIDED
TRIP BLANK NOT ON COC
TRIP BLANK INTACT
TRIP BLANK NOT INTACT
RECEIVED WATER TRIP BLANK
RECEIVED SOIL TRIP BLANK
SC.INFORMA ION
NUMBER OF ENCORES ? ZS_GRAM S-GRAM
NUMBER OF 5035 FIELD KITS?
NUMBER OF LAB FILTERED METALS 7
pH PAPER LOT#s WIDE RANGE A436172
SUMMARY OF COMMENTS-
TECHWICIAN 5)GNATUREIIIA
NF 10114
TEMPERATURE INFORMATION
IRTWUCRM ID__ ] CORR. FACTOR —1�R—
OBSERVED TEMPS:
CORRECTED TEMPS:
SAMPLE ❑yFOIRMATiON
INCORRECT NUMBER OF CONTAINERS USED
SAMPLE RECEIVED IMPROPERLY PRESERVED
INSUFFICIENT VOLUME FOR ANALYSIS
DATESi1 Mm ON COC DO NOT MATCH SAMPLE LABEL
1D'5 ON COC DO NOT (HATCH LABEL
NVOC VIALS HAVE HEADSPACE (MACRO BUBBLES)
BOTTLES RECEIVED BUT ANALYSIS NOT REQUESTED
D BOTTLES RECEIVED FOR ANALYSIS REQUESTED
UNCLEAR FILTERING OR COMPOSITING INSTRUCTIONS
SANIPLE CONTAINER(S) RECEIVED BROKEN
5439 FIELD KITS NOT RECEIVED WITHIN 48 HOURS
BULK VOA SOIL JARS NOT RECEIVED W ITHN 48 HOURS
SOLIDSJAR NOT RECEIVED
SIDUAL CHLORINE PRESENT LOT#
(APPLICABLE TO EPA 690 SERIES OR NORTH CAROLMA ORGAMCS]
NARROW RANGE_ HC42I754 OTHER(spi!dfy) 401-230010
` UVIXWERSIGNATUH
receipt ranTirmatiaR 102914.xis
-a ,,_
FA23838: Chain of Custody
Page 2 of 3
■R 17 of 23
FA23838 "O`pnTtlp"°

0
3
FA23838: Chain of Custody
Page 3 of 3
■R 18 of 23
E A U-rEST.
FA23838 `—tl ` 1. "" °

Section 6
Southeast
■ ,o,.ccuTEST
L A E3 0 R A 7 O R f E S
General Chemistry
QC Data Summaries
Includes the following where applicable:
• Method Blank and Blank Spike Summaries
• Duplicate Summaries
• Matrix Spike Summaries
■w 19 of 23
E AMMU-rEO-r
FA23838 "O`nnitl"10

METHOD BLANK AND SPIKE RESULTS SUMMARY
GENERAL CHEMISTRY
Login Number: FA23838
Account: BPAMSS - Atlantic Richfield Company
Project: URSNCM:S/S 24163: 381 Knollwood St, Winston-Salem, NC
MB Spike BSP BSP QC
Analyte Batch ID RL Result Units Amount Result %Recov Limits
Alkalinity, Total as CaCO3
GN66068
5.0
0.0
mg/1
250
252
100.8
90-113%
Alkalinity, Total as CaCO3
GN66069
25
0.0
mg/1
250
248
99.0
90-113%
Chloride
GP25875/GN66075
2.0
0.0
mg/1
50
51.2
102.4
90-110%
Sulfate
GP25875/GN66075
2.0
0.0
mg/1
50
50.3
100.6
90-110%
Associated Samples:
Batch GN66068: FA23838-1,
FA23838-3, FA23838-5
Batch GN66069: FA23838-2,
FA23838-4
Batch GP25875: FA23838-1,
FA23838-2, FA23838-3,
FA23838-4,
FA23838-5
•
(*) Outside of QC limits
Page 1
■w 20 of 23
M AMMU-rE0-r
FA23838 "O`nnitl"10

DUPLICATE RESULTS SUMMARY
GENERAL CHEMISTRY
Login Number: FA23838
Account: BPAMSS - Atlantic Richfield Company
Project: URSNCM:S/S 24163: 381 Knollwood St, Winston-Salem, NC
QC Original DUP QC
Analyte Batch ID Sample Units Result Result RPD Limits
Alkalinity, Total as CaCO3 GN66068 FA23838-3 mg/1 442 427 3.4 0-20%
Alkalinity, Total as CaCO3 GN66069 FA23664-13 mg/1 875 850 2.9 0-20%
Associated Samples:
Batch GN66068: FA23838-1, FA23838-3, FA23838-5
Batch GN66069: FA23838-2, FA23838-4 IV
(*) Outside of QC limits
Page 1
1
■A 21 of 23
E AMMU-rE0-r
FA23838

MATRIX SPIKE RESULTS SUMMARY
GENERAL CHEMISTRY
Login Number: FA23838
Account: BPAMSS - Atlantic Richfield Company
Project: URSNCM:S/S 24163: 381 Knollwood St, Winston-Salem, NC
QC Original Spike MS QC
Analyte Batch ID Sample Units Result Amount Result %Rec Limits
Chloride GP25875/GN66075 JB92931-13AA mg/1 34.7 50 85.4 101.4 90-110%
Sulfate GP25875/GN66075 JB92931-13AA mg/1 53.3 50 104 101.4 90-110%
Associated Samples:
Batch GP25875: FA23838-1, FA23838-2, FA23838-3, FA23838-4, FA23838-5
(*) Outside of QC limits
W
(N) Matrix Spike Rec. outside of QC limits
Page 1
1
■R 22 of 23
E AMMU-rE0-r
FA23838 "Oon"'tl"i°0

MATRIX SPIKE DUPLICATE RESULTS SUMMARY
GENERAL CHEMISTRY
Login Number: FA23838
Account: BPAMSS - 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 RPD Limit
Chloride GP25875/GN66075 JB92931-13AA mg/1 34.7 50 85.0 0.5 20%
Sulfate GP25875/GN66075 JB92931-13AA mg/1 53.3 50 104 0.0 20%
Associated Samples:
Batch GP25875: FA23838-1, FA23838-2, FA23838-3, FA23838-4, FA23838-5
(*) Outside of QC limits
(N) Matrix Spike Rec. outside of QC limits
Page 1
i
■w 23 of 23
M AMMU-rE0-r
FA23838 "O`pnitl"10

APPENDIX D
HISTORICAL GROUNDWATER FIELD PARAMETER DATA

Appendix D
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
MS/CM
mg/I.
3/23/06
6.97
-44
19.1
0.696
0.48
5/8/07
7.00
-190.8
20.30
0.388
1.00
5/14/08
6.18
19.0
0.668
5/28/09
7.20
19.7
0.452
5/27/10
6.84
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
20.32
0.708
4.6
6/14/12
ND
6.84
21.7
20.53
0.854
0.5
7/9/12
ND
7.08
-7
21.42
0.753
3.6
8/14/12
ND
7.02
-51.9
1 22.43
0.552
2.7
MW-3
9/19/12
0.07'
7.00
-125.9
22.06
0.854
0.9
12/5/12
6.89
-66.6
20.65
0.774
1.3
2/26/12
6.61
-72.5
16.30
0.573
1.3
5/31/13
6.82
-10.6
19.81
0.823
3.8
8/28/13
6.65
-21.3
22.43
0.855
1.93
11/7/13
ND
6.44
-17.5
21.15
0.752
2.08
2/27/14
7.36
-58.2
14.23
0.522
6.92
6/3/14
6.71
67.3
19.28
0.615
0.42
10/16/14
6.60
-39.9
21.35
0.750
2.83
4/23/15
6.64
-71.9
18.64
0.679
3.31
3/23/06
5.67
5.0
18.44
0.144
0.77
5/8/07
5.15
143.2
20.60
0.076
0.65
MW-5
5/14/08
3.45
19.5
0.104
5/28/09
6.11
19.7
0.328
5/27/10
2.624
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
0.078
1.1
6/14/12
ND
13.08
8.9
23.57
37.82
0.5
7/9/12
ND
13.10
39.9
22.42
35.02
7.2
8/14/12
0.07'
13.38
144.1
23.36
34.91
0.3
9/19/12
ND
13.36
39.9
23.12
46.21
0.2
12/5/12
12.39
1.2
22.79
27.87
0.6
MW-5R
2/26/12
11.66
-44.7
15.14
16.44
1.2
5/31/13
10.76
-60.4
20.03
11.25
0.7
8/28/13
11.42
165.1
22.12
29.66
3.01
11/7/13
3.94
10.61
110.1
21.59
24.82
2.00
2/27/14
ND
9.42
128
16.26
5.735
4.53
6/2/14
8.61
143.2
21.87
11.109
0.61
10/16/14
8.99
46.7
22.00
19.220
0.39
4/23/15
8.64
-232.9
18.72
10.400
1 0.77
3/23/06
6.18
217
18.19
0.656
0.3
5/8/07
6.59
67.7
19.22
0.683
2.01
5/14/08
5.40
18.2
0.382
MW-6
5/28/09
4.51
19.3
0.325
5/27/10
5.97
88.4
17.91
0.311
3.07
10/31/11
13.772
-184.7
20.71
49.87
1.25
6/2/14
7.54
9.4
20.86
4.19
1.30
A.,mm�me�a.,aaw„aI-R�-­­­.A.a,.,..w wn, rya 1 of 3

Appendix D
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
MS/CM
mg/I.
3/23/06
6.08
-32
18.3
0.277
0.25
5/8/07
6.67
-123.5
19.66
0.169
0.40
5/14/08
6.32
18.3
0.159
MW-6I
5/28/09
6.43
19.4
0.132
5/27/10
5.35
10.3
18.57
0.060
0.67
10/31/11
6.89
-32.5
18.85
0.184
1.40
6/2/14
5.62
90.3
21.11
0.181
2.23
3/23/06
6.95
-150
17.93
0.601
0.14
5/8/07
7.05
-118.0
19.88
0.556
0.36
MW 8
5/14/08
5.91
19.3
0.445
5/28/09
6.49
19.5
0.469
5/27/10
4.03
105.1
18.38
0.090
2.55
10/31/11
4.80
198.1
21.88
0.250
1.9
5/22/12
ND
4.59
250.4
19.80
0.158
0.8
6/14/12
32.18
13.32
17.2
22.80
194.5
17.163
7/9/12
8.4
13.38
116.7
21.56
68.5
32.853
8/14/12
3.64
13.09
171
21.75
20.15
42.283
9/19/12
0.665
12.74
123.9
21.92
19.1
13.973
12/5/12
ND
11.34
25.4
22.10
6.993
2.1
MW-8R
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
11/7/13
0.96
7.03
262.9
21.01
14.96
1.43
2/27/14
1.86
7.64
149.7
16.53
11.65
3.81
6/2/14
6.40
149.7
19.88
10.153
0.17
10/16/14
6.42
141.9
21.35
7.601
0.97
4/23/15
6.19
-79.4
18.12
3.939
1.33
3/23/06
4.62
257
18.99
0.081
0.39
5/8/07
4.46
196.8
19.09
0.060
0.95
5/14/08
4.49
18.8
0.079
MW-14
5/28/09
4.75
19.9
0.077
5/27/10
1.564
253.3
18.82
0.169
2.97
10/31/11
4.59
260.9
21.31
0.157
2.84
6/3/14
4.24
161.1
19.31
0.093
0.24
3/23/06
4.48
294
17.85
0.048
0.06
5/8/07
4.31
-134.4
19.34
0.042
0.32
5/14/08
3.40
18.3
0.042
5/28/09
MW-15
5/27/10
3.46
119.5
17.03
0.130
2.99
10/31/11
4.44
254.1
19.32
0.061
2.80
6/3/14
4.23
198.4
17.31
0.076
1.76
10/16/14
4.99
175.8
18.27
0.080
1.92
3/23/06
4.33
529
18.07
6.81
5/8/07
5/14/08
3.83
17.7
0.736
5/28/09
MW-16
5/27/10
3.97
99.9
17.32
0.687
1.60
10/31/11
4.44
244.9
19.62
0.706
3.20
11/7/13
ND
4.27
210.1
18.91
0.533
1.30
6/3/14
4.13
191.3
17.26
0.725
1.84
I-R�-­­­.�a 2 of 3

Appendix D
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
mS/cm
mg/L
3/23/06
4.21
488
18.86
--
4.63
5/8/07
6.46
-14.4
20.06
0.392
1.15
5/14/08
4.98
20.1
0.391
MW-17
5/28/09
6.11
19.6
0.310
5/27/10
5.25
57.9
18.43
0.287
0.57
10/31/11
6.31
-90.5
20.80
0.556
0.66
6/3/14
6.00
-35.4
18.64
0.407
0.14
10/31/11
6.86
12.9
22.47
0.117
2.4
5/22/12
ND
6.20
30.7
21.43
0.001
3.0
6/14/12
ND
13.12
5
21.06
54.11
1 0.3
7/9/12
ND
11.92
40.4
21.29
10.05
1.2
8/14/12
ND
10.88
-35
22.59
2.533
0.2
9/19/12
ND
11.09
-35
22.59
3.301
0.2
12/5/12
6.91
-68.1
22.85
0.859
0.7
2/26/12
6.11
-84.2
14.86
0.589
1.0
MW-18
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
11/7/13
ND
9.84
158.7
20.02
6.111
1.82
2/27/14
7.24
-101
13.93
6.157
4.26
6/2/14
7.01
-98.3
20.39
8.162
0.13
10/16/14
6.96
-212.9
22.56
4.798
0.49
4/23/15
7.02
-187.4
19.15
3.242
1.82
10/31/11
5.37
190
21.81
0.193
3.9
5/22/12
ND
4.62
131.7
19.89
0.103
0.9
6/14/12
6.615
13.30
-15.8
21.57
117.8
22.383
7/9/12
ND
12.75
46.9
21.91
13.4
25.793
8/14/12
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
12/5/12
9.99
20.1
23.03
1.537
5.2
2/26/12
8.14
-41.9
16.85
1.511
0.8
MW-19
5/31/13
7.50
192.5
19.86
5.885
2.7
8/28/13
6.20
213.1
21.16
5.29
3.30
11/7/13
ND
5.84
229.2
21.01
5.124
3.48
2/27/14
6.21
95.7
16.11
4.303
3.65
6/2/14
5.82
160.8
20.70
5.681
2.19
10/16/14
5.76
64.9
22.42
4.739
0.20
4/23/15
5.49
-77.4
18.81
4.276
1.21
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 consistant with historic values and may be the result of instrument malfunction.
3.) Dissolved oxygen results above saturation (approximately 9.1 mg/L at 20C) 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
by 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 NM-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
°C - degrees Celsius
mS/cm - milliSiemens per centimeter
mg/L - milligrams per liter
--' = Not Measured
ND - Not Detected
Temp. - temperature
Specific Cond. - specific conductance
3 of 3

APPENDIX E
ASP INJECTION PERFORMANCE MONITORING
PARAMETER TIME -TREND GRAPHS

pH over Time
14.0
12.0
10.0
Mi
vi
2
CL
6.0
EXi]
0.0
P:TP\Prjects\NC\24163, 1Z, W-S, 381 Knoll—od Street\5.0 Deli-rables\5.1 Draft - Interim Deliwrablcs\4.28 April 2015 GW Report\Tables\Tables, Appendices, and Graphsjuly 13

Carbon Dioxide over Time
10000
8000
7000
J
6000
a�
C 5000
a
c
O
4000
M
U
3000
2000
1000

20000
Iniartinn Fvant
IVIIZIZI]
16000
14000
12000
J
UA
E
10000
3
N 8000
UIIIII]
2000
0
Sulfate over Time
MW-3 (control)
MW-5R
MW-8R
MW-18
MW-19
c-I
—i
N
N
N
N
N
N
M
M
M
M
M
M
ItT
Ln
Ln
c-I
--�
ci
rl
--I
c-I
ci
rl
ci
ci
rl
ci
ci
ci
rl
ci
ci
rl
ri
ci
ci
ci
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
r-I
r-I
a)
O
O
r-I
r-I
r-I
00
O
O
r-I
r-I
r-I
00
O
O
r-I
r-I
r-I
00
O
M
M
N
M
M
M
M
M
N
M
M
M
M
M
N
M
M
M
M
M
N
M
\
O
\
N
\
N
\
-tT
\
lD
\
00
\
O
\
N
\
N
\
\
lD
\
00
\
O
\
N
\
N
\
\
lD
\
00
\
O
\
N
\
N
\
�
ci
rl
ci
rl
ci
ci
rl
ci
Date

Specific Conductivity over Time
200
160
140
E
v
N
120
3 100
c
0
U
80
'v
GJ
CL
40
20
MW-3 (control)
MW-5R
M W-8R
MW-18
MW-19
0
-
rl
ri
N
N
N
N
N
N
M
M
M
M
M
M
Ln
Ln
r-I
r-I
r-I
r-I
�--�
ci
ci
ci
�--�
rl
ri
ci
ci
ci
rl
ri
ci
ci
ci
�--�
ci
ci
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
\-I\-I
0)
O
O
00
O
O
00
O
O
00
O
M
M
N
M
M
M
M
M
N
M
M
M
M
M
N
M
M
M
M
M
N
M
\
O
\
N
\
N
\
\
lD
\
00
\
O
\
N
\
N
\
\
lD
\
00
\
O
\
N
\
N
\
\
lD
\
00
\
O
\
N
\
N
\
r-I
r-I
ci
ci
ci
ci
ci
rl
Date