WI0400198_Semi-Annual_20160617

June 17, 2016
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
NCDEQ Incident No. 6400
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 17, 2016
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
Dear Mr. Rogers:
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.
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.: 60486285
Prepared for:
Atlantic Richfield Company (ARCO) 1�p
A BP Products North America Inc.
affiliated company
1114 North Court St. # 125
Medina, Ohio 44256 0
June 17, 2016
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 Groundwater Quality Standards,
April 2016
Table 3 Groundwater Field Parameter Data, April 2016
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

Certification Page
FORMER I NOLLWOOD GULF STATION (BP 24163)
381 KNOLLWOOD STREET
WINSTON-SALEM, FORSYTH COUNTY, NC
Report Date:
June 17, 2016
Groundwater Incident Number:
6400
Land Use Category:
Industrial/Commercial
Risk Classification:
Low (No Further Action)
Responsible Party:
Atlantic Richfield Company
1/n BP Products North America, Inc
11114 North Court St. #125
Medina, Ohio 44256
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 c�jreW hildfyo�rcurate to the best of my knowledge. C A f?0' /,fir
0-.E55�
Q SEAL r�
044228
Jasen i a, P.E �'•F'N c�� Q.� Date
URS rpvratio —North Carolina J'f/9S�cN p Z���1
►�w
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.
UM i ii

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 2016.
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
Tanks (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,
2011b).
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).
Groundwater sampling events performed in December 2012 and February 2013 were
documented in a Semi -Annual Data Report (URS, 2013b).

SECTIONONE 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.
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.
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 28 and 29, 2016. The sampling was not
completed in one day because the peristaltic pump broke on day one and a backup pump was not
available. The event included sampling of monitoring wells MW-5R, MW-8R, MW-18, and
MW-19 in accordance with the injection well permit and recent correspondence with DWQ.
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. The current water
level measurements are presented along with historical gauging data in Appendix A.
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.
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, 2008).
tS 2-1

SECTIONTHREE
Results and Discussion
3.1 GROUNDWATER SAMPLING RESULTS
Groundwater laboratory analytical results for the April 2016 sampling event are presented in
Table 2. Historical analytical data is presented in Appendix B. The laboratory analytical report
for the groundwater sampling event is included in Appendix C. Groundwater field parameter
data for the sampling event is 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.
3.2 PERFORMANCE MONITORING DISCUSSION
The following list provides a brief summary of notable performance monitoring trends.
• The current groundwater field parameter results were consistent with historical
monitoring events. The pH levels in the monitoring wells ranged from 5.61 (MW-19)
to 8.61 (MW-5R).
• The sulfate concentration in MW-18 was below the groundwater quality standard of
250 mg/L while the sulfate concentrations in MW-5R, MW-8R, and MW-19 were
above the groundwater quality standard; however, the concentrations continue to
decrease.
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 for two
consecutive sampling events. Additionally, groundwater field parameters will be
collected during each sampling event.
um 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.
tS 4-1

SECTIONFIVE References
NCDENR, 2008. Guidelines for Sampling. UST Section, North Carolina Department of
Environment and Natural Resources Division of Waste Management. July 15, 2008
Version.
USEPA, 2008. USEPA Contract Laboratory Program National Functional Guidelines for
Superfund Organic Methods Data Review and USEPA CLP NFG Inorganic Superfund
Data Review.
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.
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.
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.
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, 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.
um 5-1

SECTIONFIVE
References
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. December 11, 2013.
US 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\Proje \NC\24163, 3Z, W-S, 381 Knollwood S-65.0 D,liv bl,,\5.1 Draft- Interim Delive bl.\4.28 April 2015 GW Rq-\Tables\Tables, Appendiw , and Graphsjuly 13We11. Ca (Table I)6/22/20152:36 PM

Table 2
Summary of Groundwater Results
Compared to Groundwater Quality Standards,
April 2016
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, NC
NC 2L
Groundwater
Sample ID:
MW-5R
MW-811
MW-18
MW-19
Standards +
Interim (IMACs)
Collection Date:
4/28/2016
4/29/2016
4/29/2016
4/28/2016
Parameters
NCDENR 04/13
Units
Miscellaneous
Sulfate 250 mg/L 2,980 1,640
79.4
1,780
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\4.30 April 2016 GW
Report\Tables\Table 2
5/20/2016, 12:48 PM

Table 3
Groundwater Field Parameter Data, April 2016
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-5R
13.61
8.61
40.7
20.58
6.639
0.55
MW-8R
13.53
6.36
67.8
20.24
3.347
1.16
MW-18
13.62
6.54
-15.6
21.75
0.317
2.26
MW-19
13.38
5.61
81.3
20.71
3.571
0.55
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 Delivemblee\4.30 April 2016 GW Report\Tables\Tables, 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
•
U.P.
•
U.P. �S
Cg10
D.P.
— PROPERTY LINE
• U.P.
CONCRETE
ABANDONED GROUNDWATER
GRASS
EL CTRIC
MONITORING WELL
PARKING
METER
P FORMER PRODUCT LINE
MN�-17
�B 0 CATCH BASIN
101
®
o NH• MAN HOLE
`
X�=o AREA LIGHT
ASPHALT
TRASH
• U.P. UTILITY POLE
IPARKING
ENCLOSURE
MW-3
METAL iP
SHED
F.H.FIRE HYDRANT
❑ T TELEPHONE
r
0
� METAL SHED
U.P.,`
LARGE MANHOLE COVER
FORMER GASOLINE
UST AREA I
GROUNDWATER MONITORING WELL
LLB LLJ
FORMER
BP SERVICE
�
STATION
(n
MW-18+
CONCRETE
PAD
O
2.0
I
MW-5R
M -14
O
Y
W
1
MW-8
-'
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
—19
F I
SITE CDS
FORMER ARACD ER STI
M
pRM
S
DIES L
R
FORMER PUMP
ISLAND (TYP)
I
CON CR E TE7
/
FO ER
TANK HOLD
T
0 0 0
o FORMER T
0 30
•
0 0 0
o CANOPY
UP.
APPROX. SCALE, ft.
�
m
O
.00
O�p0
MW-15
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
CONTRACT
DRAWING NO. REV.
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 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
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
04/28/16
ND
13.51
0.00
85.52
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
02/26/13
ND
13.89
0.00
NM
MW-5R
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
10/13/15
ND
14.19
0.00
NM
04/28/16
ND
13.61
0.00
NM
P �aP �,�mwc�a�aa.rz.w-s.,e�I--s...ns.o--­.1o.,R.,�4�m c.��.�.,n�.a�uo.,���o�e cw,�w��*an�a�ren�.a.,�a�ce..em capnsm�r �,c- E1- wPO Ar 5-01612A,- Page 1 of

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
99.26
MW-6i
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
04/28/16
ND
13.55
0.00
85.71
08/23/94
ND
12.14
0.00
85.70
03/21/95
ND
12.02
0.00
85.82
08/05/96
ND
11.99
0.00
85.85
*
11/17/98
ND
12.53
0.00
85.31
*
06/19/01
NM
NM
NM
NM
*
09/12/01
ND
12.67
0.00
85.17
*
12/27/01
14.47
15.03
0.56
83.26
MW-8
97.84
*
03/05/02
12.42
12.60
0.18
85.38
05/12/03
NM
NM
NM
NM
12/09/03
13.32
13.56
0.24
84.47
03/23/06
ND
12.15
0.00
85.69
05/08/07
ND
11.90
0.00
85.94
05/14/08
ND
11.95
0.00
85.89
05/28/09
ND
11.70
0.00
86.14
P­,u­a­. w.8.381I--8-0--. 1o.,R.,�4�mo.�,.�.,e�.,�..30.,���o�bow�.,��r,e�a�re�...,�a,ce..,w�n,m�r�31,,,ow11-wPoAr5-01612A,- Page 2of5

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
02/26/13
ND
13.80
0.00
NM
MW-8R
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
10/13/15
ND
14.08
0.00
NM
04/28/16
ND
13.53
0.00
NM
06/24/93
NM
NM
NM
NM
O8/23/94
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/O1
ND
14.81
0.00
85.63
12/27/O1
ND
14.85
0.00
85.59
03/05/02
100.44
ND
14.64
0.00
85.80
MW-14
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
04/28/16
ND
13.65
0.00
86.79
06/24/93
NM
NM
NM
NM
08/23/94
NM
NM
NM
NM
03/21/95
ND
12.83
0.00
87.08
08/05/96
ND
12.77
0.00
87.14
11/17/98
ND
13.58
0.00
86.33
06/19/O1
ND
13.80
0.00
86.11
09/12/01
ND
14.18
0.00
85.73
12/27/01
ND
14.29
0.00
85.62
03/05/02
ND
13.98
0.00
85.93
99.91
05/12/03
NM
12.75
NM
87.16
MW-15
12/09/03
ND
12.89
0.00
87.02
03/23/06
ND
13.14
0.00
86.77
05/08/07
ND
12.90
0.00
87.01
05/14/08
ND
13.12
0.00
86.79
05/28/09
ND
12.90
0.00
87.01
05/27/10
ND
12.25
0.00
87.66
10/31/11
ND
13.61
0.00
86.30
06/02/14
ND
12.82
0.00
87.09
10/16/14
ND
13.91
0.00
86.00
04/28/16
ND
13.15
0.00
86.76
P �aP �,umwcva�aa, rz, w-s.,e� I-- s... 0 en-. 1 o.,R-,�4�m en�.�.,m.a�..,o A,�� �me cw w„�,ran�a rem.. A�a�ceo, em capnsm�r �,c- 11-(A,, A) 5-01612A, - Page 3 of 5

Appendix A
Historical Groundwater Elevation Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
TOC
Depth to
Depth to
LNAPL
Corrected
Well
Date
Elevation
LNAPL
Groundwater
Thickness
Groundwater
(1)
(feet btoc)
(feet 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
05/12/03
100.00
NM
14.15
NM
85.85
MW-17
12/09/03
ND
14.50
0.00
85.50
03/23/06
ND
14.45
0.00
85.55
05/08/07
ND
14.22
0.00
85.78
05/14/08
ND
14.22
0.00
85.78
05/28/09
ND
14.12
0.00
85.88
05/27/10
ND
13.90
0.00
86.10
10/31/11
ND
14.72
0.00
85.28
06/02/14
ND
14.14
0.00
85.86
04/28/16
ND
14.36
0.00
85.64
10/31/11
ND
13.95
0.00
NM
05/22/12
ND
14.10
0.00
NM
06/14/12
ND
13.61
0.00
NM
07/09/12
ND
14.05
0.00
NM
08/14/12
ND
14.43
0.00
NM
09/19/12
ND
14.34
0.00
NM
12/05/12
NS
ND
14.62
0.00
NM
02/26/13
ND
14.67
0.00
NM
05/31/13
ND
14.57
0.00
NM
MW 18
08/28/13
ND
14.33
0.00
NM
11/07/13
ND
14.51
0.00
NM
02/27/14
ND
13.76
0.00
NM
06/02/14
ND
13.55
0.00
NM
10/16/14
ND
14.37
0.00
NM
04/23/15
ND
13.84
0.00
NM
10/13/15
ND
14.81
0.00
NM
04/28/16
ND
13.62
0.00
NM
1 �aP �,umwcva�a3. 3. w.6. 3811--66.. 0on­. I-- 1- on­­.301, 12016c aw­a�ra A. d­ a 31- E1- (A,, A) 5a 01612A,- Page 4 of 5

Appendix A
Historical Groundwater Elevation Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
Well
Date
TOC
Elevation
(1)
Depth to
LNAPL
(feet btoc)
Depth to
Groundwater
(feet btoc)
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
05/31/13
ND
13.47
0.00
NM
MW-19
08/28/13
ND
13.56
0.00
NM
11/07/13
ND
14.25
0.00
NM
02/27/14
ND
13.17
0.00
NM
06/02/14
ND
13.14
0.00
NM
10/16/14
ND
14.03
0.00
NM
04/23/15
ND
13.46
0.00
NM
10/13/15
ND
14.01
0.00
NM
04/28/16
ND
13.38
0.00
NM
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
btoc = below top of casing
- During the May 2003 sampling event LNAPL was observed in MW-5. Depth to groundwater and thickness of LNAPL were not measured.
P�aP�,umw�a��.rz,w.:.,aI­­:-ooe1--I 201ow�­ar,M...�a,ce. c IP Iy31,,,ow11-(A,,A)5-0161=:a,PM Page 5of5

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
11700
2,440
32,000
13,500
16,100
--
--
3/23/2006
11,000
2,370
30,700
13,200
15,400
--
--
5/8/2007
7,410
1,590
21,100
8,920
8,830
--
-
5/8/2007 ("
7,400
1,680
20,100
9,290
9,360
--
--
5/14/2008
10,000
2,100
29,000
12,000
18,000
--
-
5/14/2008 (')
10,000
2,100
30,000
12,000
18,000
--
--
5/28/2009
7,390
2,330
25,700
13,400
6,920
--
--
5/28/2009 (')
61510
2,240
22,100
12,900
6,510
1--
--
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
--
--
5/22/2012
7,980
3,470
32,200
19,200
3,820
< 5
179
6/15/2012 (2)
244
227
1,190
1,120
36.9
6,070
1,820
7/9/2012
336 J
481 J
2,010 J
2,400 J
48.4 J
6,470
2,620
8/14/2012
201
283
1,050
1,300
48.5
14,700
4,190
9/19/2012
158
181
650
883
114
19,000
3,280
12/5/2012
754
505
2,220
2,380
1,160
13,600
1,840
2/26/2013
1,360
878
3,520
3,940
1,660
8,520
1,530
5/31/2013
1,410
1,380
5,930
1 6,220
1,150 J
4,680
1,560
8/28/2013
165
1 178
489
1,380
417
13,900
1,590
11/7/2013
214
131
331
969
651
14,400
1,570
2/27/2014
142
177
328
1,060
240
2,990
1 807
P:\BP\Projects\NC\24163, JZ, W-S, 381 Knollwood Street\5.0 Deliverables\5.1 Draft - Interim Deliverables\4.30 April 2016 GW Report\Appendices\Appendix B
6/16/2016, 12:40 PM

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
10/13/2015
--
--
--
--
--
5,790
-
4/28/2016
--
--
--
--
--
2,980
--
MW-06
5/12/2003
< 0.5
0.52 J
< 0.5
< 1
3
--
--
12/9/2003
2.3
0.64 J
1.1
1 3.6
17.6
1--
--
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
1--
--
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
1560
--
--
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
45540 J
15870 J
17,100 J
105800 J
15530 J
65570
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
125500
45200
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
15020
603
3,200
3,430
1,190
7,670
940
6/2/2014
1,360 J
680 J
3,510 J
3,330 J
2,110 J
--
--
6/2/2014 (1)
1,540
556 J
3,650
2,630 J
2,640 J
--
--
10/16/2014
35310
883
9,070
45990
35910
35560
842
4/23/2015
--
--
--
--
--
2,050
812
10/13/2015
--
--
--
-
--
1,600
--
4/29/2016
--
--
--
--
--
1,640
-
P:\BP\Projects\NC\24163, JZ, W-S, 381 Knollwood Street\5.0 Deliverables\5.1 Draft - Interim Deliverables\4.30 April 2016 GW Report\Appendices\Appendix B
6/16/2016, 12:40 PM

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
1,540
513
4/23/2015
--
-
--
--
--
780
1,100
10/13/2015
--
--
--
--
--
516
-
4/29/2016
--
--
--
--
--
79.4
--
P:\BP\Projects\NC\24163, JZ, W-S, 381 Knollwood Street\5.0 Deliverables\5.1 Draft - Interim Deliverables\4.30 April 2016 GW Report\Appendices\Appendix B
6/16/2016, 12:40 PM

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-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 ("
4,020
1,440
18,200
7,940
3,290
1,090
6,520
7/9/2012
5,130
2,910
30,400 J
16,300
5,330
232
991
8/14/2012
2,420
1,650
14,200
8,370
4,090
469
1,080
9/19/2012
2,090
1,630
12,900
8,640
3,960
260
690
12/5/2012
2,320
1,810
15,200
10,400
4,010
58.8
588
2/26/2013
2,210
1,110
10,600
6,990
3,890
169
503
5/31/2013
1,830
894
8,820
5,250
3,120
1,530
606
8/28/2013
2,710 J
1,190 J
13,100
7,420 J
3,240 J
2,660
525
11/7/2013
2,020
984
9,850
5,620
2,260
2,890
255
2/27/2014
1 2,550
1,400
10,900
7,880
3,320
2,790
322
6/2/2014
2,370
1,260
11,900
7,260
21830
--
I-
10/16/2014
--
--
--
--
--
2,340
632
4/23/2015
--
--
--
--
--
21540
514
10/13/2015
--
--
--
--
--
1,960
-
4/28/2016
--
--
--
--
--
1,780
--
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\4.30 April 2016 GW Report\Appendices\Appendix B
6/16/2016, 12:40 PM

APPENDIX C
LABORATORY ANALYTICAL REPORT

5MI
ACCUTEST
Southeast
SGS ACCUTEST I5 PART Of SGS, THE WORLD'S LEADING INSPECTION,
VERIFICATION, TESTING AND CERTIFICATION COMPANY.
Technical Report for
e-Hardcopy 2.0
Automated Report
Atlantic Richfield Company
URSNCM:S/S 24163: 381 Knollwood St, Winston-Salem, NC
60486285.106081
SGS Accutest Job Number: FA33584
Sampling Dates: 04/28/ 16 - 04/29/ 16
Report to:
AECOM, INC.
1600 Perimeter Park Drive Suite 400
Morrisville, NC 27560
ncchemistsnurs. corn
ATTN: Martha Meyers -Lee / Jasen Zinna
Total number of pages in report: 20
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.
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 (FLO02), 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 SGS Accutest.
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
SGS , 40
SGS Accutest is the sole authority for authorizing edits or modifications to this document. ACCUTEST
Unauthorized modification of this report is strictly prohibited. FA33584

Table of Contents
1
Section1: Sample Summary...................................................................................................
Section 2: Case Narrative/Conformance Summary..............................................................
Section3: Summary of Hits....................................................................................................
Section4: Sample Results........................................................................................................
4.1: FA33584-1: MW-5R.....................................................................................................
4.2: FA33584-2: MW-8R.....................................................................................................
4.3: FA33584-3: MW-18......................................................................................................
4.4: FA33584-4: MW-19......................................................................................................
Section5: Misc. Forms............................................................................................................
5.1: Chain of Custody...........................................................................................................
Section 6: General Chemistry - QC Data Summaries..........................................................
6.1: Method Blank and Spike Results Summary..................................................................
6.2: Matrix Spike Results Summary.....................................................................................
6.3: Matrix Spike Duplicate Results Summary....................................................................
Sections:
3
7
9
10
11
12
13
14
17
18
19
20
0
0
0
SGSACCUTEST
FA33584

SGS Accutest
Sample Summary
Atlantic Richfield Company
Job No: FA33584
URSNCM: S/S 24163: 381 Knollwood St, Winston-Salem, NC
Project No: 60486285.106081
Sample Collected Matrix Client
Number Date Time By Received Code Type Sample ID
FA33584-1 04/28/16 13:41 AC 04/30/16 AQ Ground Water MW-5R
FA33584-2 04/29/16 10:47 AC 04/30/16 AQ Ground Water MW-8R
FA33584-3 04/29/16 12:11 AC 04/30/16 AQ Ground Water MW-18
FA33584-4 04/28/16 12:33 AC 04/30/16 AQ Ground Water MW-19
SGSACCUTEST
FA33584

SAMPLE DELIVERY GROUP CASE NARRATIVE
Client: Atlantic Richfield Company Job No: FA33584
Site: URSNCM: S/S 24163: 381 Knollwood St, Winston-Salem, NC Report Date 5/4/2016 4:04:20 PM
4 Samples were collected on/between 04/28/2016 and 04/29/2016 and were received at SGS Accutest Southeast (SASE) on 04/30/2016
properly preserved, at 3.4 Deg. C and intact. These Samples received an SASE job number of FA33584. A listing of the Laboratory
Sample ID, Client Sample ID and dates of collection are presented in the Results Summary Section.
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: GP27884
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) FA33584-3MS, FA33584-3MSD were used as the QC samples for Sulfate.
SGS Accutest (SASE) certifies that this report meets the project requirements for analytical data produced for the samples as received at
SASE and as stated on the COC. SASE certifies that the data meets the Data Quality Objectives for precision, accuracy and completeness
as specified in the SASE Quality Manual except as noted above. This report is to be used in its entirety. SASE is not responsible for any
assumptions of data quality if partial data packages are used
Narrative prepared by:
Date: May 4, 2016
Lovelie Metzgar, QA Officer (signature on file)
Wednesday, May 04, 2016
Page 1 of 1
SGSACCUTEST
FA33584

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.
SGSACCUTEST
FA33584

Units: ug/1 (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): Defmitions 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 (Sl, 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 ISl, 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
SGSACCUIEST
FA33584

Summary of Hits Page 1 of 1
Job Number: FA33584
Account: Atlantic Richfield Company
Project: URSNCM: S/S 24163: 381 Knollwood St, Winston-Salem, NC
Collected: 04/28/16 thru 04/29/16
Lab Sample ID Client Sample ID Result/
Analyte Qual RL MDL Units Method
FA33584-1
MW-5R
Sulfate
FA33584-2
MW-8R
Sulfate
FA33584-3
MW-18
Sulfate
FA33584-4
MW-19
Sulfate
2980
100
30
mg/l
EPA 300/SW846 9056A
1640
50
15
mg/l
EPA 300/SW846 9056A
79.4
2.0
0.60
mg/l
EPA 300/SW846 9056A
1780
20
6.0
mg/1
EPA 300/SW846 9056A
SGS ACCUIEST
FA33584

ACCUTEST
Southeast
Sample Results
Report of Analysis
Section 4
SGS ACCUTEST
FA33584

SGS Accutest
Report of Analysis
Client Sample ID: MW-5R
Lab Sample ID: FA33584-1 Date Sampled: 04/28/16
Matrix: AQ - Ground Water Date Received: 04/30/ 16
Percent Solids: n/a
Project: URSNCM:S/S 24163: 381 Knollwood St, Winston-Salem, NC
General Chemistry
Analyte Result RL MDL Units DF
Sulfate 2980 100 30 mg/1 50
RL = Reporting Limit
MDL = Method Detection Limit
Page 1 of 1
Analyzed By Method
05/03/16 21:48 LJ EPA 300/SW846 9056A
U = Indicates a result < MDL
B = Indicates a result > = MDL but < RL
SGS ACCUTEST
FA33584

SGS Accutest
Report of Analysis
Client Sample ID: MW-8R
Lab Sample ID: FA33584-2 Date Sampled: 04/29/16
Matrix: AQ - Ground Water Date Received: 04/30/ 16
Percent Solids: n/a
Project: URSNCM:S/S 24163: 381 Knollwood St, Winston-Salem, NC
General Chemistry
Analyte Result RL MDL Units DF
Sulfate 1640 50 15 mg/1 25
RL = Reporting Limit
MDL = Method Detection Limit
Page 1 of 1
Analyzed By Method
05/03/16 22:06 LJ EPA 300/SW846 9056A
U = Indicates a result < MDL
B = Indicates a result > = MDL but < RL
SGS ACCUTEST
FA33584

SGS Accutest
Report of Analysis
Client Sample ID: MW-18
Lab Sample ID: FA33584-3 Date Sampled: 04/29/16
Matrix: AQ - Ground Water Date Received: 04/30/ 16
Percent Solids: n/a
Project: URSNCM:S/S 24163: 381 Knollwood St, Winston-Salem, NC
General Chemistry
Analyte Result RL MDL Units DF
Sulfate 79.4 2.0 0.60 mg/1 1
RL = Reporting Limit
MDL = Method Detection Limit
Page 1 of 1
Analyzed By Method
05/03/16 22:24 LJ EPA 300/SW846 9056A
U = Indicates a result < MDL
B = Indicates a result > = MDL but < RL
SGS ACCUTEST
FA33584

SGS Accutest
Report of Analysis
Client Sample ID: MW-19
Lab Sample ID: FA33584-4 Date Sampled: 04/28/16
Matrix: AQ - Ground Water Date Received: 04/30/ 16
Percent Solids: n/a
Project: URSNCM:S/S 24163: 381 Knollwood St, Winston-Salem, NC
General Chemistry
Analyte Result RL MDL Units DF
Sulfate 1780 20 6.0 mg/1 10
RL = Reporting Limit
MDL = Method Detection Limit
Page 1 of 1
A
46
0
Analyzed By Method
05/03/16 23:18 LJ EPA 300/SW846 9056A
U = Indicates a result < MDL
B = Indicates a result > = MDL but < RL
SGS ACCUTEST
FA33584

ACCUTEST
Southeast
Misc. Forms
Custody Documents and Other Forms
Includes the following where applicable:
• Chain of Custody
Section 5
SGS ACCUTEST
FA33584

Accutest Laboratories Southeast TC �Q!
MMR Chain of Custody gccutest JOB # ` A 3 3 PA__,�--_„ -_OF r
ACCIJTEST 4405 Vineland Road, Suite G Orlando, 32811
LABORATORIES TEL. [phone] • FAX: [phone]
Www.accutest.com
ccutest Quote
Client f Reporting Intonation 777777777
Project Information
AnalOwl
Information
.. ,n
Matrix Codes
CompanyName u�
Project Name: Z�
o
VO
In
Dw- Drinking Water
GW- Ground Water
WW - Water
SW - Surlaca Water
SW
so - soll
GL- Sludge
a -al
O.Other Liqu d
AIR-ar
S0Other Solid
WP
Y�Ix Address % c Ld T�<• qat01YB81
3<{{
city state NL zip 229'J.
I
city state
Project Contact E-mail
Sasec Ziw a T' GG lA
project# /
W Z E
Pnona#
cm 6 -!l
Fax #
Sampler(.) Names) (Primed)
AM ety
Client Puase Orer
a'ccu'c"
e #
Field ID! Point of Collection
SAMPLED
MATPI%
o1L#
?
8 3
-
W -S 2a
l6
rwl
xX
S — t{�t9%rb
I oWy
�I.7c63
TURNAROUND TIME Business D a s
Dala
Deliverabl
Informstion
Comments
l
R emarks
Approved By:! Rush Code
ET'10 Days Standard
❑ 7 Day RUSH _
❑ 5 Day 9USH
❑ 3 Day EMERGENCY
❑ 2Day EMERGENCY
❑ 1 Day EMERGENCY __ __ _
❑ OTHER
Emsrgsncy or Rush T!a Data Available VIA Email or Labllnk
COMMERCIAL "A" (RESULTS ONLY)
� COMMERCIAL "B" (RESULTS PLUS QC)
REDT1 (EPA LEVEL 3)
�FULT1 (EPA LEVEL 4)�-v__.
EDD'S
_
CMUDII
l rt+,e„-:mn,1:a m
V
t be
a t dach
time samples chance wv
Relinq h tl by S mpler:
1 iuf(Ib
Date Time:
j 3 s9 z
Re eiv :. R In u
Date'11me:
/ :Oo
Rec '
a
Relinquished by: ,�/n,,'�"
5 1. \.
Date Time:
AL'-d20-- t 6
Re wed By: Relinquished
6. . �O 7
by:
Date Time:
Received By:
1 8
Lab Use Only: Custody Seal in Place: Y N Temp Blank Provider: Y N Preserved where Applicable: Y N Total # of Coolers:: Gooier Temperature s Celsius:
FA33584: Chain of Custody
Page 1 of 3
Ln
3
SGSACCUTEST
FA33584

ACCUTEST LABORATORIES SAMPLE RECEIPT CONFIRMATION
ACCUTEST'S JOB NUMBER: EA 33 S �4 _ CLIENT: A EdoM PROJECT:_[ ,Q_416 S
DATE/TIMERECEIVED: )�
'C O^ ( 6 {MM/DD/YY 24:00) NUMBER OF COOLERS RECEIVED:_
METHOD OF DELIVERY: FEDEX UPS ACCUTEST COURIER DELIVERY OTHER:
AHMILL NUMBERS: 1762 2 S.S V to o 9
COOLER INFORMATION
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 BLANK INFORMATION
TRIP BLANK PROVIDED
TRIP BLANK NOT PROVIDED
TRliP BLANK NOT ON COC
TRIP BLANK INTACT
TRW BLANK NOT INTACT
RECEIVED WATER TRIP BLANK
RECEIVED SOIL TRIP BLANK
MISC. INFORMATION
NUMBER OF ENCORES ? 25-GRAM 5-GRAM
NUMBER OF 5035 FIELD KITS ?
NUMBER OF LAB FILTERED METALS ?
TEST STRIP LOTps pH 0-3_230315
SUMMARY OF
TECHNICIAN SIGNA
NF 11/15
TEMPERATURE INFORMATION
IR THERM ID� I CORR. FACTOR •'O, 2
OBSERVED TEMPS: 3. L
CORRECTED TEMPS: 3 ­4 (USED FOR LIMS)
SAMPLE INFORMATION
INCORRECT NUMBER OF CONTAINERS USED
SAMPLE RECEIVED IMPROPERLY PRESERVED
INSUFFICIENT VOLUME FOR ANALYSIS
DATESITIMES ON COC DO NOT MATCH SAMPLE LABEL
ID'S ON COC DO NOT MATCH LABEL
VOC VIALS HAVE HEADSPACE (MACRO BUBBLES)
BOTTLES RECEIVED BUT ANALYSIS NOT REQUESTED
NO BOTTLES RECEIVED FOR ANALYSIS REQUESTED
UNCLEAR FILTERING OR COMPOSITING INSTRUCTIONS
SAMPLE CONTAINER(S)RECEIVED BROKEN
5035 FIELD KITS NOT RECEIVED WITHIN 48 HOURS
BULK VOA SOIL JARS NOT RECEIVED WITHIN 48 HOURS
SOLIDS JAR NOT RECEIVED
RESIDUAL CHLORINE PRESENT LOTS
(APPLICABLE TO EPA 600 SERIES OR NORTH CAROLINA ORGANICS)
PH 10-12 _219813A OTHER (specify)
-- ,;� —/ u REVIEWER SIGNATURE/DA
RECEI PTLOG040416.xls
FA33584: Chain of Custody
Page 2 of 3
SGSACCUTEST
FA33584

48g££tld
OZ bo 96
L0
£ 30 £ a2lud
Spoisna jo uivuji, :b8S££V3
X 1�
O N V
� V
p N M
n.rrnrr_ �
CO
m
� v
z
A p
� C
F7 Z1
N < a
a
f7 O° Q o
Oy 1 v
I
Cn
+^rmcnl'1�
2a (AZMM
art r.. -4 m
1-1M CO
nz m MO
Im M
q v C)I
rn
o
$grn
�mm
540JM042f/27F
https://www.fedex.coiTVshipping(htmi/eWPrir,tiFranie.hMnl
After printing this label:
1. Use the'Print' button on this page to print your label to your laser or inkjet printer.
2. Fold the printed page along the horizontal line.
3. Place label in shipping pouch and affix it to your shipment so that the barcode portion of the label can be read and scanned.
Warning: Use only the printed original label for shipping. Using a photocopy of this label for shipping purposes is fraudulent and could result in additional billing charges, along with the cancellation
of your FeclE..x account number.
Use of this system constitutes your agreement to the service conditions in the current FedEx Service Guide, available on fedexcom.FedEx will not be responsible for any claim in excess of $100 per
package, whether the result of loss, damage, delay, non-delivery,misdelivery,or misinformation, unless you declare a higher value, pay an additional charge; document your actual loss and file a
timely claim. Limitations found in the current FedEx Service Guide apply. Your right to recover from FedEx for any loss, including intrinsic value of the package, loss of sales, income interest, profit,
attorney's fees, costs, and other forms of damage whether direct, incidental,consequenbel, or special is limited to the greater of $100 or the authorized declared value. Recovery cannot exceed
actual documented Ioss.Mapmum for items of extraordinary value is $1,000, e.g. jewelry, precious metals, negotiable instruments and other items listed in our ServiceGuide. Written claims must be
filed within strict time limits, see current FedEx Service Guide. `
I of 7 4/29/2016 9:57 AM

FMI
ACCUTEST
Southeast
General Chemistry
QC Data Summaries
Includes the following where applicable:
• Method Blank and Blank Spike Summaries
• Duplicate Summaries
• Matrix Spike Summaries
��A
Section 6
0
SGSACCUTEST
FA33584

METHOD BLANK AND SPIKE RESULTS SUMMARY
GENERAL CHEMISTRY
Login Number: FA33584
Account: BPAMSS - Atlantic Richfield Company
Project: URSNCM:S/S 24163: 381 Knollwood St, Winston-Salem, NC
ME
Spike BSP BSP QC
Analyte Batch ID RL Result Units Amount Result %Recov Limits
Chloride
GP27884/GN70789
2.0
0.0
mg/l
50
51.7
103.4
Fluoride
GP27884/GN70789
0.20
0.0
mg/l
2.5
2.60
104.0
Nitrogen, Nitrate
GP27884/GN70789
0.10
0.0
mg/l
2.5
2.32
92.8
Sulfate
GP27884/GN70789
2.0
0.0
mg/l
50
53.1
106.2
Associated Samples:
Batch GP27884: FA33584-1,
FA33584-2, FA33584-3,
FA33584-4
(*) Outside of QC limits
Page 1
90-110%
90-110%
90-110%
90-110%
Q1
i
SGS ACCUTEST
FA33584

MATRIX SPIKE RESULTS SUMMARY
GENERAL CHEMISTRY
Login Number: FA33584
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
GP27884/GN70789
FA33584-3
mg/l
Fluoride
GP27884/GN70789
FA33584-3
mg/l
Nitrogen, Nitrate
GP27884/GN70789
FA33584-3
mg/1
Sulfate
GP27884/GN70789
FA33584-3
mg/l
Associated Samples:
Batch GP27884: FA33584-1,
FA33584-2, FA33584-3,
FA33584-4
(*) Outside of QC limits
(N) Matrix Spike Rec. outside of QC limits
Page 1
5.8
50
57.7
103.8
90-110%
0.13 B
2.5
2.7
102.8
90-110%
0.050 U
2.5
2.4
96.0
90-110%
79.4
50
130
101.2
90-110%
O�
N
1
SGSACCUTEST
FA33584

MATRIX SPIKE DUPLICATE RESULTS SUMMARY
GENERAL CHEMISTRY
Login Number: FA33584
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
GP27884/GN70789
FA33584-3
mg/l
Fluoride
GP27884/GN70789
FA33584-3
mg/l
Nitrogen, Nitrate
GP27884/GN70789
FA33584-3
mg/l
Sulfate
GP27884/GN70789
FA33584-3
mg/l
Associated Samples:
Batch GP27884: FA33584-1,
FA33584-2, FA33584-3,
FA33584-4
(*) Outside of QC limits
(N) Matrix Spike Rec. outside of QC limits
Page 1
5.8 50 57.9 0.3 200
0.13 B 2.5 2.8 3.6 200
0.050 U 2.5 2.4 0.0 20%
79.4 50 130 0.0 20e
SGSACCUTEST
FA33584

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/L
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
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
1 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 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'
1 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
1 22.79
27.87
0.6
2/26/12
11.66
-44.7
15.14
16.44
1 1.2
MW-5R
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
1 8.61
143.2
21.87
11.109
0.61
10/16/14
8.99
46.7
1 22.00
19.220
0.39
4/23/15
8.64
-232.9
18.72
10.400
0.77
10/13/15
7.86
-122.0
23.52
12.430
0.41
4/28/16
8.61
40.7
20.58
6.639
0.55
3/23/06
6.18
217
18.19
0.656
0.3
5/8/07
1 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.w:.- oo.­., --,.gym - w_.a.­ . I 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
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
32.85'
8/14/12
3.64
1 13.09
171
21.75
20.15
42.28'
9/19/12
0.665
12.74
123.9
21.92
19.1
13.97'
12/5/12
ND
11.34
25.4
22.10
6.993
2.1
2/26/12
10.02
-59.2
15.35
2.298
0.7
MW-8R
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
1 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
10/13/15
5.10
-24.9
23.25
4.131
0.26
4/29/16
6.36
67.8
20.24
3.347
1.16
3/23/06
1 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
1 4.48
294
1 17.85
0.048
1 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
1 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
a.w:.- oo.­w --,.gym ­- . ,1 - w_.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
1 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
5/31/13
6.42
-117.2
19.62
1.036
1.0
MW-18
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
10/13/15
6.21
-107.4
26.42
3.289
0.23
4/29/16
6.54
-15.6
21.75
0.317
1 2.26
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
1 12.50
162
22.57
10.21
25.463
9/19/12
0.07'
11.71
157
22.47
3.424
1 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
5/31/13
7.50
192.5
19.86
5.885
2.7
MW-19
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
1 6.21
95.7
16.11
4.303
3.65
6/2/14
5.82
160.8
1 20.70
5.681
1 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
10/13/15
4.57
-61.8
24.60
4.446
0.25
4/28/16
5.61
81.3
20.71
3.571
0.55
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 2(°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
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 MW-6.
Subsequent elevated pH measurements in MW-5R, MW-8R, MW-18, and NM-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
= Not Measured
ND - Not Detected
Temp. - temperature
Specific Cond. - specific conductance
mS/cm - milliSiemens per centimeter
mg/L - milligrams per liter
a.w:.- oo.­­-.,.gym - w_.a.­ . 3 of 3

APPENDIX E
ASP INJECTION PERFORMANCE MONITORING
PARAMETER TIME -TREND GRAPHS

14.0
12.0
10.0
M1
V1
2
Q
6.0
EXI]
pH over Time
-1 —1 N N N N N N M M M M M cn cn cn 1n cn cn 1n �D �D
O O O O O O 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 N N N N N N
-1 a) O O "1 r-I r-I 00 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 M O
M M N M M M 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 Rt lD 00 O N N lD 00 O N N lD 00 O N N
ci ci ci ci ci ci ci ci ci c-I
Date
MW-3 (control)
MW-5R
MW-8R
MW-18
M W-19
P:\BP\Prjer,ts\NC\24163, JZ, W-S, 381 Knollwood Street\5.0 Deli-rables\5.1 Draft - Interim Deli-rables\4.30 April 2016 GW Report\Tables\Tables, Appendices, and Graphsjuly 13

Sulfate over Time
20000
Iniection Event MW-3 (control)
E R-IZIZI]
16000
14000
12000
J
dA
E
a) 10000
f0
3
N 8000
-
4000
0

200
160
140
E
v
N
120
3 100
c
0
U
80
'v
GJ
CL
40
20
0
Specific Conductivity over Time
i -1 N N N N N N M M M M M cn M in Ln Ln in Ln �O �o
O O O O O O 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 N N N N N N
rl -1 a) O O -1 -1 -1 00 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 a> O
M M N M M M 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 �t lD 00 O N N Rt lD 00 O N N -Zt lD 00 O N N -tt lD 00 O N N R*
r-I ci ci rl ci rl ci ci ci ci
Date
MW-3 (control)
MW-5R
M W-8R
MW-18
MW-19