WI0400198_Monitoring (Report)_20210804

p ARCADIS Designrnaturaland&Consultancy
fo
built assets
Mr. Michael Rogers Arcadis U.S.,Inc.
UIC Program Manager 111-D Sanders Lane
NCDEQ— DWR Bluefield,VA 24605
1636 Mail Service Center Tel [phone]
Raleigh, North Carolina 27699 Fax [phone]
www.arcadis.com
Subject:
1st Semi-Annual Groundwater Monitoring Report—2021
Former BP Facility#24163
381 Knollwood Street ENVIRONMENT
Winston-Salem, North Carolina 27103
Incident Number: 6400 (Closed)
Date:
Risk Classification: Low (No Further Action)
June 25, 2021
Dear Mr. Rogers:
Contact:
On behalf of Atlantic Richfield Company (ARCO), a BP Products North America,
Inc. (BP) affiliated company, Arcadis G&M of North Carolina is submitting the Hardik Patel
attached 1st Semi-Annual Groundwater Monitoring Report—2021 for the above
referenced site.
Phone:
Please contact me at [phone] with any questions or concerns related to
the Report or this incident number. 919.328.5605
Sincerely,
Arcadis G&M of North Carolina, Inc. Email:
[e-mail]
INAS "A'/4
Our ref:
Hardik Patel 30013560
AFS Project Manager (GP16BPNA.NC10)
Copies:
File— BP #24163

ARCADIS !)esign&Consultancy
for naturaland
Built assets
Atlantic Richfield Company
c/o BP Products North America, Inc.
1ST SEMI-ANNUAL MONITORING
REPORT - 2021
Former BP Facility #24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
NCDEQ Incident #6400 (Closed)
Injection Permit #WI0400198
June 2021

1st Semi-Annual Monitoring Report-2021
1ST SEMI-ANNUAL
MONITORING REPORT
- 2021
Prepared for:
Atlantic Richfield Company
c/o BP Products North America, Inc.
Mr. Kyle Christie—Project Manager
Pa/AS 1919 Mariposa Lane
Fullerton,CA 92833
Hardik Patel Tel [phone]
AFS Project Manager
Prepared by:
Arcadis G&M of North Carolina, Inc.
5420 Wade Park Blvd.
Suite 350
Raleigh, North Carolina 27607
Tel [phone]
■ •17.t Fax [phone]
C. Scott Bostian, P.- tEAL
North Carolina f E. o. 2 www.arcadis-us.com
Senior Engineer ��
.'� tt‘ea„ Environmental Our Ref.:
-04
30013560
Date:
June 10,2021
This document is intended only for the use of
the individual or entity for which it was
prepared and may contain information that is
privileged, confidential and exempt from
disclosure under applicable law. Any
dissemination, distribution or copying of this
document is strictly prohibited.
arcadis.com ES-1

1st Semi-Annual Monitoring Report- 2021
1st Semi-Annual Monitoring Report—2021
Former BP Facility#24163
381 Knollwood St
Winston-Salem, Forsyth County, North Carolina
Latitude 36°5' 25.94"N Longitude 80° 17' 11.79"W
(Reference Figure 1)
Groundwater Incident#: 6400 (Closed)
Risk Classification: Low(No Further Action)
Reason for Risk Classification: Dissolved-phase Sulfate
concentrations above
groundwater quality standards
(2L)
Land Use Category: Industrial/Commercial
Source of Release: Former gasoline UST system(s)
Date of Release Discovery: 1983
Estimated Quantity of Release: Unknown
Cause of Release: Former UST System
Responsible Party Atlantic Richfield Company
c/o BP Products North America,
Inc.
Attn: Kyle Christie
1919 Mariposa Lane
Fullerton, CA 92833
[phone]
Property Owner Mr. Charles Sherren
Thruway Shopping Center, LLC.
7501 Wisconsin Ave., Suite 1500
Bethesda, Maryland, 20814
[phone] ext.215
,:r
I, �- 44V1 a Professional Engineer for Arcadis G&M of North
Carolina, Inc., do cerli,that tft- • ''A ion contained in this report is correct and accurate to the best of
my knowledge. Arc dis g� N. -'f . a=rolina, Inc. is licensed to practice geology and engineering in
North Carolina. T i cer�gn nt, nbers of the company are C-155 (geology)and C-1869 (engineering).
PE
f iti;o, t,!vX,-,0",-:4.r.!. ,.:.f A'
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1st Semi-Annual Monitoring Report- 2021
CONTENTS
1.0 Site History and Characterization 5
2.0 Groundwater Monitoring 6
2.1 Groundwater Gauging 6
2.2 Groundwater Sampling 6
2.3 Groundwater Analytical Results 7
3.0 Site Remediation 7
3.1 Remediation Activities to Date 7
4.0 Conclusions and Recommendations 8
TABLES
Table 1. Monitoring Well Construction Data
Table 2. Groundwater Elevation Data
Table 3. Summary of Groundwater Analytical Data
FIGURES
Figure 1. Site Location Map
Figure 2. Site Map
Figure 3. Potentiometric Surface Map—April 2, 2021
Figure 4. Groundwater Analytical Data—August 2018—April 2021
Figure 5. Sulfate Isoconcentration Map—April 2, 2021
APPENDICES
A—Historical Groundwater Elevation Data
B— Laboratory Analytical Report and Chain-of-Custody Record—April 21, 2021
C— Historical Groundwater Analytical Data
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1st Semi-Annual Monitoring Report- 2021
EXECUTIVE SUMMARY
On behalf of Atlantic Richfield Company(ARCO), a BP Products North America, Inc. (BP) affiliated
company, Arcadis G&M of North Carolina, Inc. (Arcadis) personnel performed the semi-annual
groundwater sampling of groundwater monitoring wells associated with Former BP Facility#24163 located
at 381 Knollwood Street, in Winston-Salem, Forsyth County, North Carolina (the Site)on April 2, 2021. All
groundwater monitoring activities were conducted in response to the final project evaluation requirement
specified in Part VII, Item 5 of the Renewal Issuance of Injection Permit WI0400198 from the North
Carolina Department of Environmental Quality(NCDEQ) Division of Water Quality—Aquifer Protection
Section in April 2013.
On April 2, 2021, Arcadis completed a semi-annual groundwater monitoring and sampling event at the
Site. Two (2)groundwater monitoring wells (MW-8R and MW-6)were gauged to determine the depth to
water(DTW). DTW ranged from 12.16 feet below top of casing (btoc) in groundwater monitoring well MW-
8R to 9.55 feet btoc in groundwater monitoring well MW-6. The historical groundwater flow direction for the
Site is towards the southeast.
On April 2, 2021, groundwater samples were collected from groundwater monitoring wells MW-8R and
MW-6. The maximum concentrations of selected dissolved-phase COCs found during the April 2021
sampling events are summarized in the table below:
Maximum Groundwater Concentrations (April 2, 2021)
Chemical of Monitoring Well Concentration North Carolina
Concern ID (mg/L) Groundwater
(COC) Quality(2L)
Standards
Sulfate MW-8R 306 250
Note:Concentration in Bold exceeds the applicable North Carolina GCL Standard
mg/L: milligrams per liter
Dissolved phase sulfate concentrations decreased compared to historical groundwater analytical data.
Dissolved phase sulfate was detected above the applicable North Carolina Groundwater Quality(2L)
Standard at groundwater monitoring well MW-8R only.
Arcadis recommends continuing the semi-annual groundwater monitoring and sampling program at the
Site to document the natural attenuation of sulfate. The next semi-annual groundwater monitoring and
sampling event is scheduled for November 2021. Groundwater monitoring wells MW-8R and MW-6 will be
gauged to evaluate the potentiometric surface at the Site. Groundwater samples will be collected from
MW-8R and MW-6 for analysis of sulfate by Standard Method 9056A. A Semi-Annual Groundwater
Monitoring Report documenting the proposed activities for 2021 will be submitted to the NCDEQ for review
and approval within 45-days of receipt of the laboratory analytical report.
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1st Semi-Annual Monitoring Report- 2021
1 .0 SITE HISTORY AND CHARACTERIZATION
Former BP Facility#24163 is located at 381 Knollwood Street, Winston-Salem, Forsyth County, North
Carolina (the Site). The Site is currently owned by Thruway Shopping Center, LLC. and serves as a
parking lot adjacent to surrounding retail stores. The site property is approximately 0.5 acres, covered by
asphalt and concrete, and was formerly developed as a retail fueling station which housed gasoline,
diesel, waste oil, and kerosene Underground Storage Tanks (USTs). A site location map is presented as
Figure 1 and a site map is shown as Figure 2.
The North Carolina Department of Environmental Quality (NCDEQ) issued groundwater incident number
6400 due to a subsurface release of gasoline that occurred on or before September 14, 1983 from a
ruptured product line associated with the UST system. The quantity of the release remains unknown.
One (1) 10,000-gallon steel gasoline UST, three (3) 6,000-gallon steel gasoline USTs, and one (1)
10,000-gallon steel diesel UST were removed from the site in 1990. Three (3) 10,000-gallon gasoline
USTs, one (1) 10,000-gallon diesel UST, and one (1) 550-gallon waste oil UST were subsequently
installed at the site and the site was purchased by M. M. Fowler, Inc. in January 1994 and continued
operation until 2004. The remaining five USTs were removed before 2005 and the site was razed.
Site geology and hydrogeology include surficial deposits immediately underlying the site are described
generally as sandy silts that grade upward to clayey silts and silty clays. Bedrock beneath the site is
mapped as a strongly foliated biotite gneiss and schist. The maximum depth of investigation at the site
has been approximately 55 feet below ground surface (bgs); bedrock has not been encountered during
site investigation work. Historically, the range for shallow groundwater beneath the site is approximately
11 to 14 feet bgs, and groundwater flow direction is toward the southeast with an apparent horizontal
gradient of approximately 0.012 feet per foot(ft/ft). The calculated groundwater seepage velocity for
shallow groundwater beneath the site is approximately 2.8 feet per year.
Two activated sodium persulfate injections were performed at the Site on June 4—9, 2012 and June 3—
6, 2013 under Underground Injection Control (UIC) Permit#W10400198 which was issued by the NCDEQ
Division of Water Quality on August 9, 2011. Approximately 11,237-gallons of sodium persulfate and
6,826-gallons of sodium persulfate were injected at the Site on June 4—9, 2012 and June 3—6, 2013,
respectively.
The NCDEQ Risk Classification for this site was reduced to "Low" on January 23, 2015 after issuing a
request for Notice of Residual Petroleum (NORP). The NORP was recorded with the Forsyth County
Register of Deeds on March 18, 2015 and imposed the following perpetual restriction on the Site
property:
• Groundwater: Groundwater from the site is prohibited from use as a water supply. Water supply
wells of any kind shall not be installed or operated on the site.
No Further Action (NFA)status was granted for the subject incident number by the NCDEQ on April 28,
2015.
In accordance with UIC Permit#WI0400198, dissolved-phase concentrations of sulfate are being
monitored on a semi-annual basis at the Site. Closure of UIC Permit#WI0400198 will be requested once
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1st Semi-Annual Monitoring Report- 2021
dissolved-phase sulfate concentrations are no longer detected above the North Carolina Groundwater
Quality (2L) Standards.
2.0 GROUNDWATER MONITORING
2.1 Groundwater Gauging
On April 2, 2021, Arcadis G&M of North Carolina, Inc. (Arcadis) personnel gauged groundwater
monitoring wells MW-8R and MW-6. Groundwater monitoring well MW-19 was paved over and
presumed destroyed when Arcadis arrived on site. Arcadis contacted NCDEQ and got approval to
sample MW-6 in lieu of MW-19. Gauging was conducted with a water interface probe (IP) prior to
purging and sampling to determine DTB and DTW. The IP and attached tape, marked in 0.01-foot
increments, were properly decontaminated before each use with Alconox soap and rinsed with
distilled water. The DTW was measured from the marked survey point on the top of well casing
(TOC). All measurements were recorded to the nearest 0.01-foot increment.
The DTW ranged from 12.16 btoc in groundwater monitoring well MW-8R to 9.55 feet btoc in
groundwater monitoring well MW-6.
Groundwater monitoring well construction details are included in Table 1. Current groundwater
elevations are summarized in Table 2. Historical groundwater gauging data is provided in
Appendix A. A potentiometric surface map depicting historical groundwater flow direction is
provided as Figure 3.
2.2 Groundwater Sampling
On April 2, 2021, groundwater monitoring wells MW-8R and MW-6 were purged of stagnant water
to prepare for groundwater sampling. Prior to purging, the amount of water to be removed was
calculated using the following formula:
3.1415 x r2 x (TD-DTW)x 7.481 = gallons of water(1 well volume)
Where: r= radius of well (in feet)
TD =total depth of well (in feet)
DTW= depth to water(in feet)
In order to ensure that the water in the wells after purging is representative of the water in the
aquifer, a minimum of three well volumes were removed.
Groundwater samples obtained from the groundwater monitoring well were collected from
disposable polyethylene bailers using new nylon rope. Groundwater samples were placed in
laboratory supplied containers and shipped on wet ice to TestAmerica Inc. in Pensacola, Florida,
for analysis of Sulfate (SO4) by Standard Method 9056A. Groundwater samples submitted for
sulfate analysis were collected in 250-milliliter plastic bottles.
The laboratory analytical report and chain-of-custody record for the April 2, 2021 groundwater
sampling event is included as Appendix B.
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1st Semi-Annual Monitoring Report- 2021
2.3 Groundwater Analytical Results
Groundwater analytical data from the April 2, 2021 groundwater sampling event indicated the
following:
• Dissolved-phase concentrations of sulfate were detected in concentrations exceeding the
applicable North Carolina 2L Standard of 250 milligrams per liter(mg/L) in groundwater
monitoring well MW-8R (306 mg/L).
Current groundwater analytical results are presented in Table 3. Historical groundwater analytical
data can be found in Appendix C. A dissolved phase concentration map is presented as Figure
4. A sulfate isoconcentration map depicting the dissolved-phase extent of sulfate exceeding the
applicable 2L groundwater quality standard is presented in Figure 5.
3.0 SITE REMEDIATION
3.1 Remediation Activities to Date
Summarized in the table below is a chronology of remediation activities performed at the site to
date:
Date Activity
September 14, 1983 Subsurface release of gasoline from a ruptured product line
associated with the UST system
December 1990 UST systems associated with release removed; 500 tons of
contaminated soil removed during UST closure
1992 Vacuum Extraction System Installed
1992 - 1994 Vacuum Extraction System Operation
1994 -2011 Monitoring of site
June 4—9, 2012 Activated Sodium Persulfate (ASP) injection event.
Approximately 11,237-gallons of sodium persulfate injected.
June 3—6, 2013 ASP injection event. Approximately 6,826-gallons of sodium
persulfate injected.
2013 - Present Monitored Natural Attenuation
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1st Semi-Annual Monitoring Report- 2021
4.0 CONCLUSIONS & RECOMMENDATIONS
Dissolved-phase sulfate was detected above the applicable 2L groundwater quality standard for
sulfate of 250 mg/L in only groundwater monitoring well MW-8R on April 2, 2021.
Arcadis recommends continuing the semi-annual groundwater monitoring and sampling program
at the Site to document the natural attenuation of sulfate. The next semi-annual groundwater
monitoring and sampling event is scheduled for September 2021. Groundwater monitoring wells
MW-8R and MW-6 will be gauged to evaluate the potentiometric surface at the Site.
Groundwater samples will be collected from MW-8R and MW-6 for analysis of sulfate by
Standard Method 9056A. A Semi-Annual Groundwater Monitoring Report documenting the
proposed activities for 2021 will be submitted to the NCDEQ for review and approval within 45-
days of receipt of the laboratory analytical report.
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Tables

Table 1 A ARCJ�D I S
Design 8 Consultancy
Monitoring Well Construction Data for natural and
Former BP Service Station No.24163 built assets
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
Well TOC Total Well Screen Avg Screen
Well Status Type Elevation Depth Diameter(inches) Interval Elevation
MW-3 In Use Type II 99.03 20 2 NA - NA NA
MW-5 Abandoned Type II 99.39 25.5 4 10.5 - 25.5 81.4
MW-5R In Use Type II NS 20 2 10 - 20 NA
MW-6 In Use Type II 98.68 25.5 4 10.5 - 25.5 80.7
MW-6i In Use Type III 99.26 55 2 50 - 55 46.8
MW-8 Abandoned Type II 97.84 24 6 NA - NA NA
MW-8R In Use Type II NS 20 2 10 - 20 NA
MW-14 In Use Type II 100.44 22 4 7 - 22 85.9
MW-15 In Use Type II 99.91 22 4 7 - 22 85.4
MW-16 In Use Type II 97.42 25 2 10 - 25 79.9
MW-17 In Use Type II 100.00 22 4 7 - 22 85.5
MW-18 In Use Type II NS 20 2 10 - 20 NA
MW-19 Destroyed(6) Type II NS 20 2 10 - 20 NA
Notes:
1. Reported in feet below grade
2. Measured in feet relative to site datum
3. Conestoga Rover and Associates,a former consultant for this Site, previously reported that no reference was found to the following wells:
MW-1, MW-9,MW-10,MW-11,MW-12 or MW-13.These wells are presumed to be abandoned.
4. Monitoring wells MW-5 and MW-8 were abandoned on 5/19/2010 and replaced with monitoring wells MW-5R and MW-8R the same day.
5. Monitoring wells MW-18 and MW-19 were installated on October 25,2011.
6. Monitoring well MW-19 was paved over and presumed destroyed on 3/25/2020.
NA=Not Applicable/Available
NS=Not Surveyed
TOC=Top of Casing
Page 1 of 1

Table 2 JR�IJ I ,Mnsultancy
Groundwater Elevation Data for natural and
Former BP Service Station No.24163 built assets
381 Knollwood Street
Winston-Salem,Forsyth County,North Carolina
"1121111Date TOC Depth to Depth to LNAPL Corrected
Groundwater Groundwater
Measured Elevation LNAPL btoc) Thickness Elevation
MW-8R 4/2/2021 NS ND 12.16 0.00 NM
MW-6 4/2/2021 98.68 ND 9.55 0.00 89.13
Notes:
1. Measured in feet relative to site datum
2. Corr.GW Elev.=(ref.point elevation)-(depth to groundwater)+(LNAPL thickness)(LNAPL specific gravity)
3. LNAPL specific gravity assumed to be 0.73
LNAPL=Light non-aqueous phase liquid
ND=Not Detected
NM=Not Measured
NS=Not Surveyed
TOC=Top of casing
btoc=below top of casing
Page 1 of 1

Table 3
Summary of Groundwater Analytical Data j R 2l DIS Desnaral ignu&Consultancy
Former BP Service Station No. 24163 built
381 Knollwood Street
Winston-Salem, Forsyth County, NC
Sample ID MW-8R MW-6
Date Sampled 4/2/2021 4/2/2021
Units mg/L mg/L
Sulfate 306 24.0
Notes:
mg/L-milligrams per liter
BOLD text indicates exceendance of NC groundwater
standard 2L for sulfate(250 mg/L).
Page 1 of 1

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AARCADIS I 5

APPENDIX A
Historical Groundwater Elevation Data

Appendix A Historical Groundwater Elevation Data A i (�^
R i DIS for natural and
Former BP Service Station No.24163 built
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 ND 13.31 0.00 85.72
05/27/10 ND 13.07 0.00 85.96
MW-3 10/31/11 99.03 ND 13.87 0.00 85.16
05/22/12 ND 13.55 0.00 85.48
06/14/12 ND 13.53 0.00 85.50
07/09/12 ND 13.98 0.00 85.05
08/14/12 ND 14.24 0.00 84.79
09/19/12 ND 14.08 0.00 84.95
12/05/12 ND 14.42 0.00 84.61
02/26/13 ND 13.55 0.00 85.48
05/31/13 ND 13.58 0.00 85.45
08/28/13 ND 13.57 0.00 85.46
11/07/13 ND 14.30 0.00 84.73
02/27/14 ND 13.28 0.00 85.75
06/02/14 ND 13.34 0.00 85.69
10/16/14 ND 14.18 0.00 84.85
04/23/15 ND 13.54 0.00 85.49
04/28/16 ND 13.51 0.00 85.52
09/19/16 ND 13.92 0.00 85.11
03/03/17 ND NM 0.00 NM
06/24/93 ND 13.51 0.00 85.88
08/23/94 ND 13.82 0.00 85.57
03/21/95 ND 13.71 0.00 85.68
08/05/96 ND 13.54 0.00 85.85
11/17/98 ND 14.08 0.00 85.31
_ 06/19/01 NM NM NM NM
09/12/01 ND 14.46 0.00 84.93
MW-5 12/27/01 99.39 14.51 15.07 0.56 84.73
03/05/02 14.45 14.88 0.43 84.82
_ 05/12/03 NM NM NM NM
12/09/03_ 13.18 13.60 0.42 86.10
_ 03/23/06 ND 13.67 0.00 85.72
05/08/07- ND 13.45 0.00 85.94
05/14/08 _ ND 13.51 0.00 85.88
05/28/09 ND 13.39 0.00 86.00
Page 1 of 5

Appendix A Historical Groundwater Elevation Data A i (�^
R i DIS for natural and
Former BP Service Station No.24163 built
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 13.70 0.00 NM _
10/31/11 ND 13.97 0.00 NM
05/22/12 ND 13.66 0.00 NM
06/14/12 ND 13.73 0.00 NM
07/09/12 ND 14.18 0.00 NM
08/14/12 ND 14.45 0.00 NM
09/19/12 ND 14.35 0.00 NM
12/05/12 ND 14.68 0.00 NM
02/26/13 ND 13.89 0.00 NM
05/31/13 ND 13.77 0.00 NM
08/28/13 ND 13.83 0.00 NM
MW-5R 11/07/13 NS ND 14.53 0.00 NM
02/27/14 ND 13.39 0.00 NM
06/02/14 ND 13.47 0.00 NM
10/16/14 ND 14.32 0.00 NM
04/23/15 ND 13.69 0.00 NM
10/13/15 ND 14.19 0.00 NM
04/28/16 ND 13.61 0.00 NM
09/19/16 ND 13.99 0.00 NM
03/03/17 ND 14.01 0.00 NM
09/20/17 ND 13.67 1.00 NM
03/01/18 ND 13.62 0.00 NM
08/20/18 ND 13.61 0.00 NM _
* 06/24/93 ND 12.31 0.00 86.37
* 08/23/94 ND 12.61 0.00 86.07
* 03/21/95 ND 13.15 0.00 85.53
* 08/05/96 ND 12.39 0.00 86.29
* 11/17/98 ND 13.16 0.00 85.52
* 06/19/01 NM NM NM NM
* 09/12/01 ND 13.51 0.00 85.17
* 12/27/01 ND 13.61 0.00 85.07
* 03/05/02 ND 11.02 0.00 87.66
05/12/03 ND 11.10 0.00 87.58
MW-6 12/09/03 98.68 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
03/25/20 ND 11.50 0.00 87.18
09/01/20 ND 11.80 0.00 86.88
04/02/21 ND 9.55 0.00 89.13 _
06/24/93 ND NM 0.00 NM
08/23/94 ND NM 0.00 NM
03/21/95 ND 14.75 0.00 84.51
08/05/96 ND 14.13 0.00 85.13
11/17/98 ND 14.09 0.00 85.17
06/19/01 ND 18.07 0.00 81.19
09/12/01 ND 16.60 0.00 82.66
12/27/01 ND 14.61 0.00 84.65 _
03/05/02 ND 14.96 0.00 84.30 _
MW-6i 05/12/03 99.26 ND 15.17 0.00 84.09
12/09/03 ND 13.55 0.00 85.71
03/23/06 ND 13.55 0.00 85.71
05/08/07 ND 12.93 0.00 86.33
05/14/08 ND 13.22 0.00 86.04
05/28/09 ND 13.39 0.00 85.87
05/27/10 ND 13.23 0.00 86.03
10/31/11 ND 13.90 0.00 85.36
06/02/14 ND 13.35 0.00 85.91
04/28/16 ND 13.55 0.00 85.71
Page 2 of 5

Appendix A Historical Groundwater Elevation Data A i (�^
R i DIS for natural and
Former BP Service Station No.24163 built
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)
* 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 1 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 I 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 I ND 11.95 0.00 85.89
05/28/09 ND 11.70 0.00 86.14 _
05/27/10 ND 12.97 0.00 NM
10/31/11 ND 13.34 0.00 NM
05/22/12 ND 13.69 0.00 NM
06/14/12 ND 14.94 0.00 NM
07/09/12 ND 14.08 0.00 NM
08/14/12 ND 14.29 0.00 NM
09/19/12 ND 14.08 0.00 NM
12/05/12 ND 14.53 0.00 NM
02/26/13 ND 13.80 0.00 NM
05/31/13 ND 13.61 0.00 NM
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
MW-8R 06/02/14 NS ND 13.34 0.00 NM
10/16/14 ND 14.18 0.00 NM
04/23/15 I ND 13.57 0.00 NM
10/13/15 ND 14.08 0.00 NM
04/28/16 ND 13.53 0.00 NM
09/19/16 ND 13.91 0.00 NM
03/03/17 ND 13.92 0.00 NM
09/20/17 ND 13.61 0.00 NM
03/01/18 ND 13.63 0.00 NM
08/20/18 ND 13.52 0.00 NM
03/15/19 ND 13.35 0.00 NM
10/08/19 ND 13.54 0.00 NM
03/25/20 ND 12.59 0.00 NM
09/01/20 ND 12.72 0.00 NM
04/02/21 I ND 12.16 0.00 NM
06/24/93 NM NM NM NM
08/23/94 NM NM NM NM
03/21/95 ND 13.55 0.00 86.89
08/05/96 ND 13.64 0.00 86.80
11/17/98 ND 14.26 0.00 86.18
06/19/01 ND 14.55 0.00 85.89
09/12/01 ND 14.81 0.00 85.63
12/27/01 ND 14.85 0.00 85.59
03/05/02 ND 14.64 0.00 85.80
MW-14 05/12/03 100.44 ND 13.41 0.00 87.03
12/09/03 ND 13.51 0.00 86.93
03/23/06 ND 13.82 0.00 86.62
05/08/07 ND 13.54 0.00 86.90 _
05/14/08 ND 13.64 0.00 86.80 _
05/28/09 ND 13.47 0.00 86.97
05/27/10 ND 13.00 0.00 87.44
10/13/11 _ ND 14.14 0.00 86.30
06/02/14 ND 13.42 0.00 87.02
04/28/16 ND 13.65 0.00 86.79
Page 3 of 5

Appendix A Historical Groundwater Elevation Data A i (�^
R i DIS for natural and
Former BP Service Station No.24163 built
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 12.83 0.00 87.08
08/05/96 ND 12.77 0.00 87.14
11/17/98 ND 13.58 0.00 86.33
06/19/01 ND 13.80 0.00 86.11
09/12/01 ND 14.18 0.00 85.73
12/27/01 ND 14.29 0.00 85.62
03/05/02 ND 13.98 0.00 85.93
MW-it 05/12/03 99.91 NM 12.75 NM 87.16
12/09/03 ND 12.89 0.00 87.02
03/23/06 ND 13.14 0.00 86.77
05/08/07 ND 12.90 0.00 87.01
05/14/08 ND 13.12 0.00 86.79
05/28/09 ND 12.90 0.00 87.01
05/27/10 ND 12.25 0.00 87.66
10/31/11 ND 13.61 0.00 86.30
06/02/14 ND 12.82 0.00 87.09
10/16/14 ND 13.91 0.00 86.00
04/28/16 ND 13.15 0.00 86.76 _
06/24/93 NM NM NM NM
08/23/94 NM NM NM NM
03/21/95 ND 12.06 0.00 85.36
08/05/96 ND 12.09 0.00 85.33 _
11/17/98 ND 12.60 0.00 84.82 _
06/19/01 ND 12.74 0.00 84.68 _
09/12/01 ND 12.98 0.00 84.44 _
12/27/01 NM NM NM NM
03/05/02 ND 12.83 0.00 84.59 _
MW-16 05/12/03 97.42 NM NM NM NM
12/09/03 ND 12.13 0.00 85.29 _
03/23/06 ND 12.18 0.00 85.24
05/08/07 NM NM NM NM
05/14/08 ND 12.03 0.00 85.39 _
05/28/09 ND 11.96 0.00 85.46 _
05/27/10 ND 11.69 0.00 85.73 _
10/31/11 ND 12.45 0.00 84.97 _
11/07/13 ND 12.88 0.00 84.54
06/02/14 ND 11.97 0.00 85.45 _
06/24/93 NM NM NM NM
08/23/94 NM NM NM NM
03/21/95 ND 14.42 0.00 85.58
08/05/96 ND 14.46 0.00 85.54
11/17/98 ND 14.91 0.00 85.09 _
06/19/01 ND 15.03 0.00 84.97 _
09/12/01 ND 15.28 0.00 84.72
12/27/01 ND 15.37 0.00 84.63 _
03/05/02 ND 15.15 0.00 84.85
MW-17 05/12/03 100.00 NM 14.15 NM 85.85
12/09/03 ND 14.50 0.00 85.50
03/23/06 ND 14.45 0.00 85.55
05/08/07 ND 14.22 0.00 85.78
05/14/08 ND 14.22 0.00 85.78
05/28/09 ND 14.12 0.00 85.88
05/27/10 ND 13.90 0.00 86.10
10/31/11 ND 14.72 0.00 85.28
06/02/14 ND 14.14 0.00 85.86
04/28/16 ND 14.36 0.00 I 85.64
Page 4 of 5

Appendix A Historical Groundwater Elevation Data A i (�^
R i DIS for natural and
Former BP Service Station No.24163 built
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)
10/31/11 ND 13.95 0.00 NM
05/22/12 ND 14.10 0.00 NM
06/14/12 ND 13.61 0.00 NM
07/09/12 ND 14.05 0.00 NM
08/14/12 ND 14.43 0.00 NM
09/19/12 ND 14.34 0.00 NM
12/05/12 ND 14.62 0.00 NM
02/26/13 ND 14.67 0.00 NM
05/31/13 ND 14.57 0.00 NM
08/28/13 ND 14.33 0.00 NM
MW-18 11/07/13 NS ND 14.51 0.00 NM
02/27/14 ND 13.76 0.00 NM
06/02/14 ND 13.55 0.00 NM
10/16/14 ND 14.37 0.00 NM
04/23/15 ND 13.84 0.00 NM
10/13/15 ND 14.81 0.00 NM
04/28/16 ND 13.62 0.00 NM
09/19/16 ND 14.04 0.00 NM
03/03/17 ND 14.08 0.00 NM
09/20/17 ND 13.21 0.00 NM
03/01/18 ND 13.60 0.00 NM
08/20/18 ND 13.42 0.00 NM
-
10/31/11 ND 13.75 0.00 NM
05/22/12 ND 13.37 0.00 NM
06/14/12 ND 13.39 0.00 NM
07/09/12 ND 13.89 0.00 NM
08/14/12 ND 14.13 0.00 NM
09/19/12 ND 14.02 0.00 NM
12/05/12 ND 14.39 0.00 NM
02/26/13 ND 13.62 0.00 NM
05/31/13 ND 13.47 0.00 NM
08/28/13 ND 13.56 0.00 NM
11/07/13 ND 14.25 0.00 NM
02/27/14 ND 13.17 0.00 NM
MW-19 06/02/14 NS ND 13.14 0.00 NM
10/16/14 ND 14.03 0.00 NM
04/23/15 ND 13.46 0.00 NM
10/13/15 ND 14.01 0.00 NM
04/28/16 ND 13.38 0.00 NM
09/19/16 ND 13.75 0.00 NM
03/03/17 ND 13.79 0.00 NM
09/20/17 ND 13.48 0.00 NM
03/01/18 ND 13.42 0.00 NM
08/20/18 ND 13.38 0.00 NM
03/15/19 ND 12.22 0.00 NM
10/08/19 ND 13.27 i 0.00 NM
03/25/20 Paved Over-Destroyed(4)
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
4. MW-19 was paved over and presumed destroyed on 3/25/2020.
-Prior to URS'work at this Site,monitoring well MW-3 has previously been reported as MW-2,monitoring well MW-
6 has previously been reported as MW-8,and monitoring well MW-8 has previously been reported as MW-6.
LNAPL=Light non-aqueous phase liquid
ND=Not detected
NM=Not measured
NS=Not Surveyed
TOC=Top of casing
btoc=below top of casing
-During the May 2003 sampling event LNAPL was observed in MW-5. Depth to groundwater and thickness of
LNAPL were not measured.
Page 5 of 5

APPENDIX B
Laboratory Analytical Report and Chain-of-Custody Record — April 21,
2021

El
ti% eurofins
• Environment Testing
America
ANALYTICAL REPORT
Eurofins TestAmerica, Pensacola
dm 3355 McLemore Drive
Pensacola, FL 32514
Tel: [phone]
::.,,. _w. Laboratory Job ID: 400-201649-1
Client Project/Site: BP 24163
r:
ARCADIS U.S., Inc.
5420 Wade Park Boulevard
Milk, Suite 350
Raleigh, North Carolina 27607
r-
'` Attn: Hardik Patel
Y2 >
Authorized for release by:
4/21/2021 11:15:41 AM
Leah Klingensmith, Senior Project Manager
[phone]
[e-mail]
LINKS
rRe►►iew your project
results through
NrTota Access A
r Have a Question?
Lim Ask
T e The test results in this report meet all 2003 NELAC, 2009 TNI, and 2016 TNI requirements for
accredited parameters, exceptions are noted in this report. This report may not be reproduced
Ex e r t except in full,and with written approval from the laboratory.For questions please contact the
G�° Project Manager at the e-mail address or telephone number listed on this page.
Ar This report has been electronically signed and authorized by the signatory.Electronic signature is
intended to be the legally binding equivalent of a traditionally handwritten signature.
Visit us at:
www.Burofinsus.COmlEnv Results relate only to the items tested and the sample(s)as received by the laboratory.

Client:ARCADIS U.S., Inc. Laboratory Job ID:400-201649-1
Project/Site: BP 24163
Table of Contents
Cover Page 1
Table of Contents 2
Sample Summary 3
Case Narrative 4
Definitions 5
Client Sample Results 6
QC Sample Results 8
QC Association 10
Chronicle 11
Method Summary 13
Certification Summary 14
Chain of Custody 15
Receipt Checklists 16
Eurofins TestAmerica, Pensacola
Page 2 of 16 4/21/2021

Sample Summary
Client: ARCADIS U.S., Inc. Job ID: 400-201649-1
Project/Site: BP 24163
Lab Sample ID Client Sample ID Matrix Collected Received Asset ID
400-201649-1 MW-6-040221 Water 04/02/21 11:30 04/07/21 09:40
400-201649-2 MW-8R-040221 Water 04/02/21 10:05 04/07/21 09:40
Eurofins TestAmerica, Pensacola
Page 3 of 16 4/21/2021

Case Narrative
Client: ARCADIS U.S., Inc. Job ID: 400-201649-1
Project/Site: BP 24163
Job ID: 400-201649-1
Laboratory: Eurofins TestAmerica, Pensacola 4
Narrative
Job Narrative
400-201649-1
Comments
No additional comments.
Receipt
The samples were received on 4/7/2021 9:40 AM. Unless otherwise noted below,the samples arrived in good condition, and where
required, properly preserved and on ice. The temperature of the cooler at receipt was 0.7°C.
HPLC/IC
No analytical or quality issues were noted, other than those described in the Definitions/Glossary page.
Eurofins TestAmerica, Pensacola
Page 4 of 16 4/21/2021

Definitions/Glossary
Client: ARCADIS U.S., Inc. Job ID: 400-201649-1
Project/Site: BP 24163
Glossary
Abbreviation These commonly used abbreviations may or may not be present in this report.
tt Listed under the"D"column to designate that the result is reported on a dry weight basis
%R Percent Recovery
CFL Contains Free Liquid
CFU Colony Forming Unit
CNF Contains No Free Liquid
DER Duplicate Error Ratio(normalized absolute difference)
Dil Fac Dilution Factor
DL Detection Limit(DoD/DOE)
DL,RA,RE, IN Indicates a Dilution,Re-analysis,Re-extraction,or additional Initial metals/anion analysis of the sample
DLC Decision Level Concentration(Radiochemistry)
EDL Estimated Detection Limit(Dioxin)
LOD Limit of Detection(DoD/DOE)
LOQ Limit of Quantitation(DoD/DOE)
MCL EPA recommended"Maximum Contaminant Level"
MDA Minimum Detectable Activity(Radiochemistry)
MDC Minimum Detectable Concentration(Radiochemistry)
MDL Method Detection Limit
ML Minimum Level(Dioxin)
MPN Most Probable Number
MQL Method Quantitation Limit
NC Not Calculated
ND Not Detected at the reporting limit(or MDL or EDL if shown)
NEG Negative/Absent
POS Positive/Present
PQL Practical Quantitation Limit
PRES Presumptive
QC Quality Control
RER Relative Error Ratio(Radiochemistry)
RL Reporting Limit or Requested Limit(Radiochemistry)
RPD Relative Percent Difference,a measure of the relative difference between two points
TEF Toxicity Equivalent Factor(Dioxin)
TEQ Toxicity Equivalent Quotient(Dioxin)
TNTC Too Numerous To Count
Eurofins TestAmerica, Pensacola
Page 5 of 16 4/21/2021

Client Sample Results
Client: ARCADIS U.S., Inc. Job ID: 400-201649-1
Project/Site: BP 24163
Client Sample ID: MW-6-040221 Lab Sample ID: 400-201649-1
Date Collected: 04/02/21 11:30 Matrix: Water
Date Received: 04/07/21 09:40
Method: 9056-Anions, Ion Chromatography
Analyte Result Qualifier RL MDL Unit D Prepared Analyzed Dil Fac
Sulfate 24.0 1.00 mg/L 04/19/21 17:58 1
6
Eurofins TestAmerica, Pensacola
Page 6 of 16 4/21/2021

Client Sample Results
Client: ARCADIS U.S., Inc. Job ID: 400-201649-1
Project/Site: BP 24163
Client Sample ID: MW-8R-040221 Lab Sample ID: 400-201649-2
Date Collected: 04/02/21 10:05 Matrix: Water
Date Received: 04/07/21 09:40
Method: 9056-Anions, Ion Chromatography
Analyte Result Qualifier RL MDL Unit D Prepared Analyzed Dil Fac
Sulfate 306 10.0 mg/L 04/21/21 03:28 10
6
Eurofins TestAmerica, Pensacola
Page 7 of 16 4/21/2021

QC Sample Results
Client: ARCADIS U.S., Inc. Job ID: 400-201649-1
Project/Site: BP 24163
Method: 9056 - Anions, Ion Chromatography
Lab Sample ID: MB 400-528204/4 Client Sample ID: Method Blank
Matrix: Water Prep Type: Total/NA
Analysis Batch: 528204
MB MB
Analyte Result Qualifier RL MDL Unit D Prepared Analyzed Dil Fac
Sulfate ND 1.00 mg/L 04/19/21 16:19 1
Lab Sample ID: LCS 400-528204/6 Client Sample ID: Lab Control Sample ITI
Matrix: Water Prep Type: Total/NA
Analysis Batch: 528204
Spike LCS LCS %Rec.
Analyte Added Result Qualifier Unit D %Rec Limits
Sulfate 10.0 9.919 mg/L 99 90-110
Lab Sample ID: LCSD 400-528204/7 Client Sample ID: Lab Control Sample Dup
Matrix: Water Prep Type: Total/NA
Analysis Batch: 528204
Spike LCSD LCSD %Rec. RPD
Analyte Added Result Qualifier Unit D %Rec Limits RPD Limit
Sulfate 10.0 9.817 mg/L 98 90-110 1 15
Lab Sample ID: MRL 400-528204/5 Client Sample ID: Lab Control Sample
Matrix: Water Prep Type: Total/NA
Analysis Batch: 528204
Spike MRL MRL %Rec.
Analyte Added Result Qualifier Unit D %Rec Limits
Sulfate 1.00 ND mg/L 87 50-150
Lab Sample ID: 400-201649-1 MS Client Sample ID: MW-6-040221
Matrix: Water Prep Type: Total/NA
Analysis Batch: 528204
Sample Sample Spike MS MS %Rec.
Analyte Result Qualifier Added Result Qualifier Unit D %Rec Limits
Sulfate 24.0 10.0 34.96 mg/L 110 80-120
Lab Sample ID: 400-201649-1 MSD Client Sample ID: MW-6-040221
Matrix: Water Prep Type: Total/NA
Analysis Batch: 528204
Sample Sample Spike MSD MSD %Rec. RPD
Analyte Result Qualifier Added Result Qualifier Unit D %Rec Limits RPD Limit
Sulfate 24.0 10.0 35.36 mg/L 114 80-120 1 20
Lab Sample ID: MB 400-528453/4 Client Sample ID: Method Blank
Matrix: Water Prep Type: Total/NA
Analysis Batch: 528453
MB MB
Analyte Result Qualifier RL MDL Unit D Prepared Analyzed Dil Fac
Sulfate ND 1.00 mg/L 04/20/21 16:43 1
Lab Sample ID: LCS 400-528453/6 Client Sample ID: Lab Control Sample
Matrix: Water Prep Type: Total/NA
Analysis Batch: 528453
Spike LCS LCS %Rec.
Analyte Added Result Qualifier Unit D %Rec Limits
Sulfate 10.0 9.926 mg/L 99 90-110
Eurofins TestAmerica, Pensacola
Page 8 of 16 4/21/2021

QC Sample Results
Client: ARCADIS U.S., Inc. Job ID: 400-201649-1
Project/Site: BP 24163
Method: 9056 - Anions, Ion Chromatography
Lab Sample ID: LCSD 400-528453/7 Client Sample ID: Lab Control Sample Dup
Matrix: Water Prep Type: Total/NA
Analysis Batch: 528453
Spike LCSD LCSD %Rec. RPD
Analyte Added Result Qualifier Unit D %Rec Limits RPD Limit
Sulfate 10.0 9.918 mg/L 99 90-110 0 15
Lab Sample ID: MRL 400-528453/5 Client Sample ID: Lab Control Sample ri
Matrix: Water Prep Type: Total/NA
Analysis Batch: 528453
Spike MRL MRL %Rec.
Analyte Added Result Qualifier Unit D %Rec Limits
Sulfate 1.00 ND mg/L 88 50-150
Lab Sample ID: 400-201733-D-1 MS Client Sample ID: Matrix Spike
Matrix: Water Prep Type: Total/NA
Analysis Batch: 528453
Sample Sample Spike MS MS %Rec.
Analyte Result Qualifier Added Result Qualifier Unit D %Rec Limits
Sulfate 10.1 10.0 20.60 mg/L 105 80-120
Lab Sample ID: 400-201733-D-1 MSD Client Sample ID: Matrix Spike Duplicate
Matrix: Water Prep Type: Total/NA
Analysis Batch: 528453
Sample Sample Spike MSD MSD %Rec. RPD
Analyte Result Qualifier Added Result Qualifier Unit D %Rec Limits RPD Limit
Sulfate 10.1 10.0 20.54 mg/L 104 80-120 0 20
Eurofins TestAmerica, Pensacola
Page 9 of 16 4/21/2021

QC Association Summary
Client: ARCADIS U.S., Inc. Job ID: 400-201649-1
Project/Site: BP 24163
HPLC/IC
Analysis Batch: 528204
Lab Sample ID Client Sample ID Prep Type Matrix Method Prep Batch
400-201649-1 MW-6-040221 Total/NA Water 9056
MB 400-528204/4 Method Blank Total/NA Water 9056
LCS 400-528204/6 Lab Control Sample Total/NA Water 9056
LCSD 400-528204/7 Lab Control Sample Dup Total/NA Water 9056
MRL 400-528204/5 Lab Control Sample Total/NA Water 9056
400-201649-1 MS MW-6-040221 Total/NA Water 9056
400-201649-1 MSD MW-6-040221 Total/NA Water 9056
8
Analysis Batch: 528453
Lab Sample ID Client Sample ID Prep Type Matrix Method Prep Batch
400-201649-2 MW-8R-040221 Total/NA Water 9056
MB 400-528453/4 Method Blank Total/NA Water 9056
LCS 400-528453/6 Lab Control Sample Total/NA Water 9056
LCSD 400-528453/7 Lab Control Sample Dup Total/NA Water 9056
MRL 400-528453/5 Lab Control Sample Total/NA Water 9056
400-201733-D-1 MS Matrix Spike Total/NA Water 9056
400-201733-D-1 MSD Matrix Spike Duplicate Total/NA Water 9056
Eurofins TestAmerica, Pensacola
Page 10 of 16 4/21/2021

Lab Chronicle
Client: ARCADIS U.S., Inc. Job ID: 400-201649-1
Project/Site: BP 24163
Client Sample ID: MW-6-040221 Lab Sample ID: 400-201649-1
Date Collected: 04/02/21 11:30 Matrix: Water
Date Received: 04/07/21 09:40
Batch Batch Dil Initial Final Batch Prepared
Prep Type Type Method Run Factor Amount Amount Number or Analyzed Analyst Lab
Total/NA Analysis 9056 1 528204 04/19/21 17:58 TAJ TAL PEN
Client Sample ID: MW-8R-040221 Lab Sample ID: 400-201649-2
Date Collected: 04/02/21 10:05 Matrix: Water
Date Received: 04/07/21 09:40
Batch Batch Dil Initial Final Batch Prepared
Prep Type Type Method Run Factor Amount Amount Number or Analyzed Analyst Lab
Total/NA Analysis 9056 10 528453 04/21/21 03:28 TAJ TAL PEN 9
Client Sample ID: Method Blank Lab Sample ID: MB 400-528204/4
Date Collected: N/A Matrix: Water
Date Received: N/A
Batch Batch Dil Initial Final Batch Prepared
Prep Type Type Method Run Factor Amount Amount Number or Analyzed Analyst Lab
Total/NA Analysis 9056 1 528204 04/19/21 16:19 TAJ TAL PEN
Client Sample ID: Method Blank Lab Sample ID: MB 400-528453/4
Date Collected: N/A Matrix: Water
Date Received: N/A
Batch Batch Dil Initial Final Batch Prepared
Prep Type Type Method Run Factor Amount Amount Number or Analyzed Analyst Lab
Total/NA Analysis 9056 1 528453 04/20/21 16:43 TAJ TAL PEN
Client Sample ID: Lab Control Sample Lab Sample ID: LCS 400-528204/6
Date Collected: N/A Matrix: Water
Date Received: N/A
F Batch Batch Dil Initial Final Batch Prepared
LPrep Type Type Method Run Factor Amount Amount Number or Analyzed Analyst Lab
Total/NA Analysis 9056 1 528204 04/19/21 17:09 TAJ TAL PEN
Client Sample ID: Lab Control Sample Lab Sample ID: LCS 400-528453/6
Date Collected: N/A Matrix: Water
Date Received: N/A
rBatch Batch Dil Initial Final Batch Prepared
Prep Type Type Method Run Factor Amount Amount Number or Analyzed Analyst Lab
Total/NA Analysis 9056 1 528453 04/20/21 17:32 TAJ TAL PEN
Client Sample ID: Lab Control Sample Dup Lab Sample ID: LCSD 400-528204/7
Date Collected: N/A Matrix: Water
Date Received: N/A
Batch Batch Dil Initial Final Batch Prepared
Prep Type Type Method Run Factor Amount Amount Number or Analyzed Analyst Lab
Total/NA Analysis 9056 1 528204 04/19/21 17:33 TAJ TAL PEN
Eurofins TestAmerica, Pensacola
Page 11 of 16 4/21/2021

Lab Chronicle
Client: ARCADIS U.S., Inc. Job ID: 400-201649-1
Project/Site: BP 24163
Client Sample ID: Lab Control Sample Dup Lab Sample ID: LCSD 400-528453/7
Date Collected: N/A Matrix: Water
Date Received: N/A
Batch Batch Dil Initial Final Batch Prepared
Prep Type Type Method Run Factor Amount Amount Number or Analyzed Analyst Lab
Total/NA Analysis 9056 1 528453 04/20/21 17:57 TAJ TAL PEN
Client Sample ID: Lab Control Sample Lab Sample ID: MRL 400-528204/5
Date Collected: N/A Matrix: Water
Date Received: N/A
Batch Batch Dil Initial Final Batch Prepared
Prep Type Type Method Run Factor Amount Amount Number or Analyzed Analyst Lab
Total/NA Analysis 9056 1 528204 04/19/21 16:44 TAJ TAL PEN 9
Client Sample ID: Lab Control Sample Lab Sample ID: MRL 400-528453/5
Date Collected: N/A Matrix: Water
Date Received: N/A
Batch Batch Dil Initial Final Batch Prepared
Prep Type Type Method Run Factor Amount Amount Number or Analyzed Analyst Lab
Total/NA Analysis 9056 1 528453 04/20/21 17:08 TAJ TAL PEN
Client Sample ID: MW-6-040221 Lab Sample ID: 400-201649-1 MS
Date Collected: 04/02/21 11:30 Matrix: Water
Date Received: 04/07/21 09:40
Batch Batch Dil Initial Final Batch Prepared
Prep Type Type Method Run Factor Amount Amount Number or Analyzed Analyst Lab
Total/NA Analysis 9056 1 528204 04/19/21 18:23 TAJ TAL PEN
Client Sample ID: MW-6-040221 Lab Sample ID: 400-201649-1 MSD
Date Collected: 04/02/21 11:30 Matrix: Water
Date Received: 04/07/21 09:40
F Batch Batch Dil Initial Final Batch Prepared
LPrep Type Type Method Run Factor Amount Amount Number or Analyzed Analyst Lab
Total/NA Analysis 9056 1 528204 04/19/21 18:48 TAJ TAL PEN
Client Sample ID: Matrix Spike Lab Sample ID: 400-201733-D-1 MS
Date Collected: N/A Matrix: Water
Date Received: N/A
rBatch Batch Oil Initial Final Batch Prepared
Prep Type Type Method Run Factor Amount Amount Number or Analyzed Analyst Lab
Total/NA Analysis 9056 1 528453 04/20/21 18:47 TAJ TAL PEN
Client Sample ID: Matrix Spike Duplicate Lab Sample ID: 400-201733-D-1 MSD
Date Collected: N/A Matrix: Water
Date Received: N/A
Batch Batch Dil Initial Final Batch Prepared
Prep Type Type Method Run Factor Amount Amount Number or Analyzed Analyst Lab
Total/NA Analysis 9056 1 528453 04/20/21 19:12 TAJ TAL PEN
Laboratory References:
TAL PEN=Eurofins TestAmerica, Pensacola,3355 McLemore Drive, Pensacola, FL 32514,TEL[phone]
Eurofins TestAmerica, Pensacola
Page 12 of 16 4/21/2021

Method Summary
Client: ARCADIS U.S., Inc. Job ID: 400-201649-1
Project/Site: BP 24163
Method Method Description Protocol Laboratory
9056 Anions, Ion Chromatography SW846 TAL PEN
Protocol References:
SW846="Test Methods For Evaluating Solid Waste, Physical/Chemical Methods",Third Edition,November 1986 And Its Updates.
Laboratory References:
TAL PEN=Eurofins TestAmerica,Pensacola,3355 McLemore Drive, Pensacola,FL 32514,TEL[phone]
10
Eurofins TestAmerica, Pensacola
Page 13 of 16 4/21/2021

Accreditation/Certification Summary
Client: ARCADIS U.S., Inc. Job ID: 400-201649-1
Project/Site: BP 24163
Laboratory: Eurofins TestAmerica, Pensacola
Unless otherwise noted,all analytes for this laboratory were covered under each accreditation/certification below.
Authority Program Identification Number Expiration Date
North Carolina(WW/SW) State 314 12-31-21
The following analytes are included in this report,but the laboratory is not certified by the governing authority. This list may include analytes for which
the agency does not offer certification.
Analysis Method Prep Method Matrix Analyte
9056 Water Sulfate
m
Eurofins TestAmerica, Pensacola
Page 14 of 16 4/21/2021

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Page 15 of 16 4/21/2021

Login Sample Receipt Checklist
Client:ARCADIS U.S., Inc. Job Number:400-201649-1
Login Number: 201649 List Source: Eurofins TestAmerica, Pensacola
List Number: 1
Creator: Whitley,Adrian
Question Answer Comment
Radioactivity wasn't checked or is</=background as measured by a survey N/A
meter.
The cooler's custody seal, if present, is intact. N/A
Sample custody seals, if present, are intact. N/A
The cooler or samples do not appear to have been compromised or True
tampered with.
Samples were received on ice. True
Cooler Temperature is acceptable. True
Cooler Temperature is recorded. True 0.7°C IR7
COC is present. True
COC is filled out in ink and legible. True
COC is filled out with all pertinent information. True
Is the Field Sampler's name present on COC? True
There are no discrepancies between the containers received and the COC. True
Samples are received within Holding Time(excluding tests with immediate True
HTs)
Sample containers have legible labels. True
Containers are not broken or leaking. True
Sample collection date/times are provided. True
Appropriate sample containers are used. True
Sample bottles are completely filled. True
Sample Preservation Verified. N/A
There is sufficient vol.for all requested analyses, incl. any requested True
MS/MSDs
Containers requiring zero headspace have no headspace or bubble is N/A
<6mm (1/4").
Multiphasic samples are not present. True
Samples do not require splitting or compositing. True
Residual Chlorine Checked. N/A
Eurofins TestAmerica, Pensacola
Page 16 of 16 4/21/2021

APPENDIX C
Historical Groundwater Analytical Data

Appendix C �^
Historical Groundwater Analytical Summary j R f.\DIS D sran&Cons ltancy
Former BP Service Station No.24163 built assets
381 Knollwood Street
Winston-Salem,Forsyth County,North Carolina
1 - I
Carbon
Well Sample Date Benzene Ethylbenzene Toluene Xylenes(Total) MTBE Sulfate Dioxide
NC GCL: 5,000 84,500 260,000 85,500 20,000 NE NE -
NC 2L 1 600 600 500 20 250 NE -
Units: pg/I pg/I pg/I pg/I pg/I mg/I mg/I
5/13/2003 8.5 0.98 J 0.61 J 1.7 J 8_ -- --
12/9/2003 47.4 14.3 1.9 8.1 r 37.3 -- --
3/23/2006 4.5 J <0.5 <0.5 UJ <1 UJ 5.5 -- --
5/8/2007 40.4 3.7 1.4 2 J 13.1 -- --
5/14/2008 4.3 J <0.8 <0.7 <0.8 14 -- --
5/28/2009 5.4 0.44 J 0.14 J 0.49 J 5.6 -- --
5/27/2010 0.44 J <0.11 0.3 J <0.32 4.8 -- -- _
10/31/2011 5.5 0.76 <0.17 U 0.38 J 19.1 8.4 405 _
5/22/2012 <0.43 U <0.2 <0.2 <0.52 4.6 15.3 378 _
6/14/2012 12.1 6.7 0.72 4.7 15.4 6.6 J 344 _
7/9/2012 2.2 1.6 2.6 3 14.7 9.9 393 _
MW-3 8/14/2012 2 2.1 <0.13 0.4 J 17.9 3.6 303 _
9/19/2012 2.7 0.66 <0.13 0.33 J 19.8 2.8 459 _
12/5/2012 11.3 1.2 0.43 J 1.1 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 _
9/19/2016 21.3 --
3/23/2006 11,700 2,440 32,000 13,500 16,100 -- --
3/23/2006(1) 11,000 2,370 30,700 13,200 15,400 -- --
5/8/2007 I. 7,410 1,590 21,100 8,920 8,830 -- I -- _
MW-5 5/8/2007 i1i g 7,400 1,680 20,100 9,290 9,360 -- --
-
5/14/2008 10,000 2,100 29,000 12,000 18,000 -- -- -
5/14/2008I1) 10,000 2,100 30,000 12,000 18,000 -- --
5/28/2009 7,390 2,330 25,700 13,400 6,920 -- --
5/28/2009(1) 6,510 2,240 22,100 12,900 6,510 -
_ --
-
5/27/2010 6,610 2,810 24,300 J 15,700 4,330 -- --
5/27/2010(1) 6,090 2,380 30,100 J 13,300 4,250 -- --
10/31/2011 7,960 2,660 28,000 13,800 3,830 <1 <5
10/31/2011(1) III 8,360 2,870 24,600 14,800 4,070 -- --
5/22/2012 IL 7,980 3,470 32,200 19,200 3,820 <5 179
6/15/2012(2) 244 227 1,190 1,120 36.9 6,070 1,820
7/9/2012 336 J 481 J 2,010 J 2,400 J 48.4 J 6,470 2,620
MW-5R 8/14/2012 201 283 1,050 1,300 48.5 14,700 4,190
9/19/2012 158 181 650 _883 114 19,000 3,280
12/5/2012 754 505 2,220 2,380 1,160 13,600 1,840
2/26/2013 1,360 878 3,520 3,940 1,660 8,520 1,530
5/31/2013 1,410 1,380 5,930 6,220 1,150 J 4,680 1,560
8/28/2013 165 178 489 1,380 417 13,900 1,590
11/7/2013 214 131 331 969 651 14,400 1,570
2/27/2014 142 177 328 1,060 240 2,990 807
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-SR 9/19/2016 -- -- -- _ -- -- 2,880
3/3/2017 _ -- -- -- - -- 3,570 --
-
9/20/2017 - - 1,060 --
3/1/2018 163 -- _
8/20/2018 147
Page 1 of 4

Appendix C �^
Historical Groundwater Analytical Summary j R f.\DIS D sran&Cons ltancy
Former BP Service Station No.24163 built assets
381 Knollwood Street
Winston-Salem,Forsyth County,North Carolina
Carbon
Well Sample Date Benzene Ethylbenzene Toluene Xylenes(Total) MTBE Sulfate Dioxide
NC GCL: 5,000 84,500 260,000 85,500 20,000 NE NE -
NC 2L 1 600 600 500 20 250 NE _
Units: pg/I pg/I pg/I pg/I pg/I mg/I mg/I _
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 -- --
MW-6 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 -- --
3/25/2020 -- -- -- -- -- 25.2 --
9/1/2020 -- -- -- _ -- -- 38.6 --
4/2/2021 -- -- -- -- -- 24.0 --
5/12/2003 <0.5 <0.5 <0.5 1.1 J <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 -- --
MW-61 5/14/2008 5.2 J <2 <1.8 <2 3,400 -- --
5/28/2009 2.5_ <0.05 <0.06 <0.14 1,150 -- --
5/27/2010 1.6 J <1.1 <1.1 <3.2 492 -- --
10/31/2011 0.41 J <0.36 <0.32 <0.75 122 <1 76.1
6/2/2014 <0.1 <0.1 <0.1 <0.2 3.3 -- --
3/23/2006 671 1,340 1,230 8,100 124 -- --
MW 8 5/8/2007 1,160 799 196 2,990 _ 1,440 -- --
5/14/2008 600 1,800 700 3,000 190 -- --
5/28/2009 1,390 2,050 357 3,310 1,560 -- -- _
5/27/2010 Mr 8,570 2,870 31,700 15,700 6,260 -- --
10/31/2011 r 8,000 3,180 32,100 17,200 3,170 <1 <5
5/22/2012 8,270 4 3,360 1 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 A 3,040 i 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 -- -- _
MW-8R 6/2/2014(1) 1,540 556 J 3,650 2,630 J 2,640 J -- --
10/16/2014 3,310 883 9,070 4,990 3,910 3,560 842 _
4/23/2015 -- -- -- _ -- 2,050 812 _
10/13/2015 -- -- -- -- 1,600 --
4/29/2016 -- -- -- _ -- -- 1,640 --
9/19/2016 _ -- 1,330 --
3/3/2017 -- -- -- _ -- -- 1,720 --
9/20/2017 -- -- -- _ -- -- 797 --
3/1/2018 -- -- -- _ -- -- 677
8/20/2018 -- 436 --
3/15/2019 -- -- -- -- -- 60 --
10/8/2019 -- 475 --
3/25/2020 -- -- -- -- -- 450 --
I 9/1/2020 -- -- -- -- -- 442 --
I 4/2/2021 -- -- -- -- -- 306 --
5/12/2003 <0.5 _ <0.5 <0.5 <1 0.52 J -- --
12/9/2003 <0.5 <0.5 <0.5 <1 5.9 -- --
3/23/2006 <0.5 <0.5 <0.5 <1 <0.5 -- _ -
5/8/2007 <0.5 <0.5 <0.5 _ <1 <0.5 -- -
MW-14 5/14/2008 <0.5 <0.8 <0.7 <0.8 <0.5 -- -
5/28/2009 <0.06 <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 <0.2 <0.1 -- -
Page 2 of 4

Appendix C �^
Historical Groundwater Analytical Summary j R f.\DIS D sran&Cons ltancy
Former BP Service Station No.24163 built assets
381 Knollwood Street
Winston-Salem,Forsyth County,North Carolina
Carbon
Well Sample Date Benzene Ethylbenzene Toluene Xylenes(Total) MTBE Sulfate Dioxide
NC GCL: 5,000 84,500 260,000 85,500 20,000 NE NE -
NC 2L 1 600 600 500 20 250 NE -
Units: pg/I pg/I pg/I pg/I pg/I mg/I mg/I _
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 -- -
M W-15 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 <0.2 <0.1 -- -
10/16/2014 <0.1 <0.1 <0.1 <0.2 <0.1 -- --
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 -- --
MW-16 5/27/2010 3.6 54.7 J 5.1 525 J 1.3 -- --
10/31/2011 <0.65 17.2 <1.4 U 321 <0.65 194 <5
11/7/2013 -- -- -- -- -- 55.4 <5
6/3/2014 <0.1 25 0.92 417 J <0.1 -- --
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 -- --
M W-17 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 -- -- -
10/31/2011 3,140 998 11,100 8,950 1,140 8.2 446 _
5/22/2012 2,280 2,790 18,200 12,000 789 <5 307
6/15/2012(2) 373 910 4,800 3,910 114 10,600 3,410
7/9/2012 1,730 J 2,170 J 15,000 J 9,750 J 676 J 2,300 835
8/14/2012 3,020 2,990 24,400 12,800 1,090 758 580
9/19/2012 3,190 3,090 22,600 14,000 1,240 322 542
12/5/2012 3,370 2,970 20,100 12,800 1,380 32 436
2/26/2013 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 1 730 1,660 139 7,850 2,230
MW-18 11/7/2013 1,140 727 4,910 3,250 694 2,640 1,370
2/27/2014 16.6 109 20.2 _ 45.8 18.5 4,310 1,270
6/2/2014 26.2 J 125 J 37.5 J 31.6 J 37.4 J -- --
10/16/2014 359 388 244 138 364 1,540 513
4/23/2015 -- -- - -- -- 780 1,100
10/13/2015 -- -- -- -- -- 516 --
4/29/2016 -- 79.4 --
9/19/2016 -- -- -- -- -- 377 --
3/3/2017 -- 295 --
9/20/2017 -- -- -- -- -- 257 -
3/1/2018 -- -- -- -- -- 253 -
8/20/2018 -- -- -- -- -- 173 --
Page 3 of 4

Appendix C �^
Historical Groundwater Analytical Summary j R f.\DIS r0fran&Consultancy
Former BP Service Station No.24163 built assets
381 Knollwood Street
Winston-Salem,Forsyth County,North Carolina
II
Carbon
Well Sample Date Benzene Ethylbenzene Toluene Xylenes(Total) MTBE Sulfate Dioxide
NC GCL: 5,000 84,500 260,000 85,500 20,000 NE NE
NC 2L 1 600 600 500 20 250 NE
Units: pg/I pg/I pg/I pg/I pg/I mg/I mg/I
10/31/2011 2,390 1,380 8,790 7,040 5,160 3.7 425
5/22/2012 2,700 1,560 14,200 7,940 4,880 <5 310
6/15/2012(2) 4,020 1,440 18,200 7,940 3,290 1,090 6,520
7/9/2012 5,130 2,910 30,400 J 16,300 5,330 232 991
8/14/2012 2,420 1,650 14,200 8,370 4,090 469 1,080
9/19/2012 2,090 1,630 12,900 8,640 3,960 260 690
12/5/2012 2,320 1,810 15,200 10,400 4,010 58.8 588
2/26/2013 2,210 1,110 10,600 6,990 3,890 169 503
5/31/2013 1,830 894 8,820 5,250 3,120 1,530 606
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
MW-19 6/2/2014 2,370 1,260 11,900 _ 7,260 2,830 -- --
10/16/2014 -- -- -- _ -- -- 2,340 632
4/23/2015 -- -- -- _ -- -- 2,540 514
10/13/2015 -- -- -- _ -- -- 1,960 -
4/28/2016 -- -- - _ -- -- 1,780 -
9/19/2016 -- -- -- _ -- -- 1,270 -
3/3/2017 -- -- -- _ -- -- 941 -
9/20/2017 -- -- -- _ -- -- 1,020 -
3/1/2018 -- -- -- -- -- 745 -
8/20/2018 -- -- - -- -- 806 --
3/15/2019 -- 1,150 --
10/8/2019 -- -- -- -- -- 783 I --
3/25/2020 Paved Over-Destroyed
Notes:
(1(Field duplicate
(2)Alkalinity,sulfate,and carbon dioxide samples were collected 6/14/2012 and volatile organic analysis samples were collected 6/15/12.
-"-Not sampled or analyzed
<-Not detected at the specified detection limit
pg/I-Micrograms per Liter
GCL-Gross Contamination Level
2L-North Carolina Groundwater Quality(2L)Standard
J-Estimated value
mg/I-Milligrams per Liter
MTBE-Methyl ten-Butyl Ether
NE-Not established
U-Not present above the associated level;blank contamination exists
UJ-Not detected and the detection limit is estimated
BOLD text indicates 2L exceedance
Bold cell with green highlight indicates GCL exceedence
Activated sodium persulfate injections were performed at the site from June 4,2012,to June 9,2012,and from June 3,2013,to June 6,2013.
Page 4 of 4

i RCAD I S Design&Consultancy
for natural and
built assets
Arcadis U.S., Inc.
111-D Sanders Lane
Bluefield, Virginia 24605
Tel [phone]
Fax [phone]
www.arcadis.com