WI0400164_Monitoring (Report)_20130919

W1 U 'f00 /C�
September 16, 2013
Ms. Sharon Cihak
Guilford County Environmental Health
400 West Market Street, Suite 300
Greensboro, North Carolina 27405
RE: Active Remedial System Monitoring Report: January Through June 2013
Former BP Site No. 013631 TravelCenters of America
1101 NC Highway 61
Whitsett, Guilford County, North Carolina
NCDENR Incident Nos. 6113 (BP), 20054 (TA), and 30318 (TA)
NCDENR Risk Ranking: High
URS Project No. 38436751
Dear Ms. Cihak:
On behalf of BP Products of North America, Inc. (BP), URS Corporation — North
Carolina (URS) is pleased to submit one copy of the Active Remedial System Monitoring
Report: January Through June 2013 for the above referenced Site. The report provides a
summary of groundwater quality data collected on May 21 and 22, 2013.
If you have any questions regarding this submittal, please call me at [phone].
Sincerely,
URS Corporation — North Carolina
l d
Margaret Ness, PG
Project Manager
cc: Greg Frisch, BP (ENFOS)
Project File (electronic)
David L. Goodrich, (NCDENR-Aquifer Protection Section) (Hard Copy)
RECEIVEDIDENR DWQ
SAP 19 2013
Aquifer Protecdon Sect on
URS Corporation — North Carolina
1600 Perimeter Park Drive, Suite 400
Morrisville, NC 27560
Tel: [phone]
Fax: [phone]

ACTIVE REMEDIAL SYSTEM
MONITORING REPORT
JANUARY THROUGH JUNE 2013
FORMER BP SITE NO.01363 &
TRAVELCENTERS OF AMERICA
1101 NC HIGHWAY 61
WHITSETT, GUILFORD COUNTY, NC
NCDENR INCIDENT NOS. 6113 (BP),
20054 (TA), AND 30318 (TA)
NCDENR RISK CLASSIFICATION: HIGH
NCDENR LAND USE: RESIDENTIAL
Prepared for
Atlantic Richfield Company (ARCC)
a BP Products of North America Inc. affiliated company
4850 E. 49th Street
MBC-3 Room 155C
Cuyahoga Heights, CH 44125
September 12, 2013
URS Corporation — North Carolina
1640 Perimeter Park Drive, Suite 400
Morrisville, North Carolina 27560
Tel. [phone]
Fax. [phone]
UR5 Project No. 38436751
hp

TITLE PACE
ACTIVE REMEDIAL SYSTEM MONITORING REPORT
JANUARY THROUGH JUNE 2013
FORMER BP SITE NO.01363 & TRAVELCENTERS OF AMERICA
1101 NC HIGHWAY 61
WHITSETT, GUILFORD COUNTY, NC
Report Date:
September 12, 2013
Responsible Party (RP): Atlantic Richfield Company (ARCO)
a BP Products of North America Inc. affiliated company
4850 E. 49th Street
MBC-3 Room 155C
Cuyahoga Heights, OH 44125
Attn: Greg Frisch
[phone]
F:1
TravelCenters of America
24601 Center Ridge Road
Westlake, OH 44145
Attn, Rob Porges
[phone]
Current Land Owner: TravelCenters of America
24601 Center Ridge Rd., Suite 200
Westlake, Ohio 44145-5634
RP Consultant: URS Corporation — North Carolina
1600 Perimeter Park Drive, Suite 400
Morrisville, North Carolina 27560
[phone]
Site Risk Classification: High
Land Use Classification: Residential
Release Information: Subsurface gasoline release from the automobile dispenser area
discovered in 1990
Release Location: N36°3.808' Latitude: W78° 33.892' Longitude
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TITLE PAGE
This Report was prepared under my direction or supervision in accordance with a system
designed to assure that qualified personnel properly gather and evaluate the information
submitted. Based on my thorough inquiry of the person or persons who manage the system, or
those persons directly responsible for gathering the information, the information submitted is, to
the best of my knowledge and belief, true, accurate, az.dte.
Margaret M. Ness, PG
Project Manager
URS Corporation — North Carolina
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TABLE OF CONTENTS
Section1 Introduction.....................................................................................................................1-1
Section2 Background.....................................................................................................................2-1
2.1 Facility Location and Description...... ....................
2.2 Site History .............................--....................................................... 2-1
2.3 Potable Well Treatment System Installations..................................I....... 2-3
2.4 Local hydrogeologic setting..................................................................... 2-3
Section 3 Sampling and Analysis Procedures..............................................................................3-1
3.1 Groundwater Sampling..............................................._............................ 3-1
3.2 Water Supply Well Sampling ................................................... .............. 3-1
3.3 Remedial System Sampling..................................................................... 3-2
Section 4 Sampling and Analysis Results....................................................................................4-1
4.1 Gauging Results...................................................................................... 4-I
4.2 Groundwater Analytical Results.............................................................. 4-1
4.3 Water Supply Well Analytical Results .................................................... 4-2
...........................
Section5 Remedial System Performance.....................................................................................5-1
Section 6 Risk Classification..........................................................................................................6-1
' Section 7 Well Integrity Inspection................................................................................................M
Section8 Conclusions....................................................................................................................8-1
Section9 Recommendations..........................................................................................................9-1
Section10 References....................................................................................................................10-1
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TABLE OF CONTENTS
TABLES
Table 1
Well Construction Information
Table 2
Groundwater Elevation Data (May 21, 2013)
Table 3
Groundwater Field Parameters (May 21 and 22, 2013)
Table 4
Summary of Groundwater Results Compared to NC 2L Groundwater Quality
Standards
Table 5A
1301 Piney Grove Treatment System Performance Compared to NC 2L
Groundwater Quality Standards
Table 5B
1205 N Hwy 61 Treatment System Performance Compared to NC 2L
Groundwater Quality Standards
Table 6
Potable Well Treatment System Operational Data
Table 7
Sample Plan
FIGURES
Figure 1
Location Map
Figure 2
Site Map
Figure 3
Vicinity Map
Figure 4
Groundwater Contour Map, May 21, 2013
Figure 5
Benzene Concentrations in Groundwater May 2013
Figure 6
IPE Concentrations in Groundwater May 2013
Figure 7
MTBE Concentrations in Groundwater May 2013
Figure 8
Naphthalene Concentrations in Groundwater May 2013
Figure 9
Total Xylenes Concentrations in Groundwater May 2013
Figure 10
Time Trend Graph of Analytical Results and Groundwater Elevations for MW-2R
Figure 11
Time Trend Graph of Analytical Results and Groundwater Elevations for MW-3
APPENDICES
Appendix Al Historical Groundwater Elevation Data (BP Incident No. 6113)
Appendix A2 Historical Groundwater Elevation Data (TA Incident No. 20054)
Appendix A3 Historical Groundwater Elevation Data (TA Incident No. 30318)
Appendix B Laboratory Reports and Chains of Custody
Appendix C1 Historical Summary of Groundwater Analytical Results (BP Incident No. 6113)
Appendix C2 Historical Summary of Groundwater Analytical Results — VOCsISVOCs
(TA incident No. 20054)
Appendix C3 Historical Summary of Groundwater Analytical Results -- VPHIEPH
(TA incident No. 20054)
Appendix C4 Historical Summary of Groundwater Analytical Results (TA Incident No. 30318)
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TABLE OF CONTENTS
Appendix D Receptor Survey
Appendix E Well Abandonment Records
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SECTIONONE Introduction
URS Corporation — North Carolina (URS) presents this report on behalf of Atlantic Richfield
Company (ARCO), a BP Products of North America Inc. (13P) affiliated company, for the
TravelCenters of America (TA) site located atl 101 NC Highway 61 in Whitsett, North Carolina
(Site - BP Site No. 1363, North Carolina Department of Environment and Natural Resources
(NCDENR) Incident No. 6113). This report presents the point -of -entry (POE) remediation
system operation and maintenance (O&M) activities conducted from January through June 2013
and the results of Site groundwater sampling on May 21 and 22, 2013. These activities were
conducted in accordance with the Revised Corrective Action Plan (CAP), prepared by Piedmont
Geologic, P.C. (Piedmont, 2001 b) and Incident No. 20054 as a result of a release discovered in
1990. Due to community releases and NCDENR trust fund issues, TA entered into an agreement
with BP, to address issues for TA's active incident numbers 20054 and 30318.
This report presents the results of groundwater samples collected on May 21 and 22, 2013 from
the three incident numbers. Potable water supply wells are located within 1,500 feet of the Site.
This report also summarizes the carbon treatment systems installed to treat methyl tert-butyl
ether (MTBE) that was detected in the potable wells located at 1301 Piney Grove Road and 1205
NC Highway 61 South and the results of groundwater samples collected on May 21, 2013.
The Site is designated as NCDENR Incident Number 6113, 20054, and 30318, with a current risk
classification of High.
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SECTIONTWO Backurnund
2.1 FACILITY LOCATION AND DESCRIPTION
The Site is located at 1101 NC Highway 61 in Whitsett, Guilford County, North Carolina
(Figure 1), at the northeastern corner of the intersection of NC Highway 61 and Interstates 85140.
The Site property comprises approximately 28 acres and contains the following commercial
establishments:
■ TA facility, including truck diesel dispenser islands, BP -branded automobile gasoline
dispenser islands, restaurant/service center, truck scales, and truck maintenance
garage;
• Daystop Motel;
• Popeye's Restaurant; and
• Burger King Restaurant.
Open areas surrounding the commercial establishments are mostly paved with concrete or asphalt
and are used for truck and automobile parking. Landscaped and other grassy areas are located
along the Site perimeter (Figure 2), The Site topography slopes downward from NC Highway 61
toward the southeast. A storm water retention basin and sanitary sewer lift station are located at
the southeastern corner of the Site.
2.2 SITE HISTORY
The Site was operated by BP as a TA -branded truck stop from 1988 until 1993. TA was a
wholly -owned subsidiary of BP until December 1993, at which time TA and BP became separate
entities. The Site is currently owned and operated by TA.
BP
A petroleum release from a former automobile gasoline dispenser was discovered in 1990 and
was assigned NCDENR Incident No. 6113. A Comprehensive Site Assessment (CSA) was
prepared by Matrix Technologies, Inc. (Matrix, 1993) to document assessment activities
performed at the Site from 1990 to 1993.
The Site was originally assigned a priority ranking of 85E by NCDENR, However, a potable
water supply well was discovered in the Site vicinity around 1997. In an October 28, 1997 letter
to BP, NCDENR reclassified the Site as 85B, a high risk classification.
Following the completion of additional assessment activities in 1998 and 1999, a CSA report
addendum, (CRA Services, 1999) was submitted to NCDENR. A September 26, 2000 letter from
NCDENR to BP granted acceptance of the CSA and CSA Addendum, and requested completion
of a CAP. The initial CAP, dated February 14, 2001 (Piedmont, 2001), proposed soil vapor
extraction to remediate the soils in the automobile dispenser area and monitored natural
attenuation to remediate the groundwater. In an April 2, 2001 letter to BP, NCDENR rejected the
natural attenuation approach and requested submittal of a revised CAP.
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SECTICNTWO Background
A pilot test of combined soil vapor extraction and air sparging was conducted in May 2001 and a
dual -phase vapor extraction (DPVE) pilot test was conducted in June 2001, Batted on the results
of pilot testing, DPVE was selected as the remediation technology for the Site and the Revised
Corrective Action Plan was submitted by Piedmont on July 15, 2001. The DPVE system was
installed between April and June 2002.
The DPVE system was constructed and assembled by Product Recovery Management (PRM) of
North Carolina. An oil -sealed liquid ring pump extracts water and air from three recovery wells
(DP-1 through DP-3). The locations of these recovery points are shown on Figure 2. The
recovered liquid and vapor pass through an air/moisture separator. The vapor passes through a
particulate filter and then through the liquid ring pump before it is discharged to the atmosphere.
The liquid is contained in the moisture separator until the high level float switch activates a
transfer pump to move the fluid into the oil/water separator, where the water is separated from
any LNAPL that may be present. When the water level in the oil/water separator is high enough
to activate a high-level float switch, another transfer pump moves the water through a low -profile
air stripper, which removes approximately 98% of the volatile organics in the water. After
treatment of the water by the air stripper, it passes through a totalizing flow meter prior to being
discharged to the City of Burlington Publicly Owned Treatment Works (POTW). The treated
groundwater is discharged under permit number G0026, issued on December 8, 2008. The
system start-up occurred on June 28, 2002. After several years of operation, asymptotic levels
were reached and the treatment system was shut down in 2012. Remedial measures to advance
the Site toward closure are currently being evaluated.
TA
A diesel fuel release was discovered in the current underground storage tank (UST) area in May
1999 through observations of a light non -aqueous phase liquid (LNAPL) sheen in stormwater
originating from the UST area. An investigation of the release indicated that the source was
broken seals in the UST drop tubes. This release was assigned NCDENR Incident No. 20054.
UST system repairs and initial LNAPL abatement activities were conducted through the
remainder of 1999, resulting in the recovery of a reported 13,212 gallons of diesel fuel from the
UST pit. Approximately 300 tons of soils were removed from the UST area during the UST
repair activities.
Petroleum impacted soil was discovered during piping and dispenser upgrades in April 2006 and
approximately 102 tons of hydrocarbon impacted soil were removed. NCDENR assigned
Incident No. 30318 to this release. At the time of discovery, no active leak was identified and the
source is likely from former fuel dispensing operations. A minor amount of LNAPL was reported
in March 2009, but has not been detected since.
The locations of the Site wells are shown on Figure 2. Monitoring well construction details are
presented on Table 1.
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SECTICNTWO Backuraund
2.3 POTABLE WELL TREATMENT SYSTEM INSTALLATIONS
In a letter dated March 7, 2006, NCDENR requested that BP include the potable well located at
1301 Piney Grove Road in the sampling program due to the presence of MTBE in the water
supply well sample. An additional potable well, located at 1205 NC Highway 61 South, was
identified by BP and was included in the sampling program. Both wells are south of the Site as
shown on Figure 3.
On March 5, 2008, POE systems were installed to treat water pumped from wells located at 1301
Piney Grove Road and 1205 NC Highway 61 South. The Piney Grove well is also referred to as
the Clapp's Chapel well and services both 1301 Piney Grove Road (a residence) and 1305 Piney
Grove Road (Clapp's Chapel). The POE systems were 'installed by Carbonair Environmental
Systems, Inc. (Carbonair), and each include two 12x52-inch Granular Activated Carbon (GAC)
vessels, one UV light treatment unit, dual five micron filters (one before carbon treatment and
one after carbon treatment), one heater unit, and one totalizing meter. Each system is housed in a
small wooden shed.
2.4 LOCAL HYDROGEOLOGIC SETTING
The Site is located within the Piedmont physiographic province. Bedrock in the Whitsett, North
Carolina area is mapped within the Carolina Slate Belt lithologic division of the Piedmont, which
consists of metamorphosed volcanic and sedimentary rocks intruded by igneous plutons and
dikes. According to the Geologic Map of Region G. North Carolina (Carpenter, 1982), bedrock
beneath the Site consists of diorite that is part of a plutonic complex in the Whitsett/Elon College
area.
Bedrock was encountered in Site borings at reported depths ranging from approximately 10 to 20
feet below land surface (ft bls). Saprolite, described as orange -reddish -brown micaceous silt and
clay, overlies the bedrock.
Groundwater in the Piedmont province occurs in the overburden under unconfined (i.e., water
table) conditions, and in the underlying bedrock under both unconfined and confined conditions.
Groundwater in the overburden occurs within pore spaces of the unconsolidated medium. Due to
the typically fine-grained nature of Saprolite, the formation normally possesses a relatively low
permeability and is not usually utilized for groundwater production. The overburden is recharged
by the infiltration of precipitation where the formation is exposed and acts as a storage medium
for groundwater that is slowly released to surface water bodies and the underlying bedrock.
Groundwater in the underlying bedrock occurs along zones of secondary porosity, such as
fractures, bedding planes, foliations, solution voids, etc. Most water supply wells in the Piedmont
are completed in bedrock.
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SECTIOMTHREE Sampling and Analysis Procedures
3.1 GROUNDWATER SAMPLING
Prior to groundwater sampling, depth -to -water in each monitoring well was measured using an
electronic oil/water interface probe, and wells to be sampled were purged of three volumes of
groundwater or until dry with a new disposable polyethylene bailer and nylon line.
Groundwater samples were collected for laboratory analysis from monitoring wells MW-2R,
MW-3, MW-6, MW-8, MW-10, MW-11, MW-15, VE-1, VEW-1, RW-IR, USTMW-1,
USTMW-2, USTMW-4, AGM-RW, CSAMW-1, CSAMW-2, CSAMW-3, CSAMW-4, and
DDMW-2 during the May 21 and 22, 2013 sampling event. Field duplicates were collected from
monitoring wells MW-2R and AGM-RW during the sampling event. Samples were collected
from each well using a dedicated bailer, transferred to laboratory -supplied containers, and were
placed in a cooler and packed in wet ice. Samples were shipped under chain -of -custody via
overnight courier to Accutest Laboratories Southeast [Accutest] in Orlando, Florida. Well
locations are shown on Figure 2.
All groundwater samples were analyzed for the following (Incident No. 6113, 20054, and
30318):
■ Volatile organic compounds (VOCs) by Standard Method 6200B
Groundwater samples collected from AGM-RW, CSAMW-1, CSAMW-2, CSAMW-3,
CSAMW-4, DDMW-2, MW-10, MW-11, MW-15, USTMW-1, USTMW-2, and USTMW-4
were also analyzed for the following (Incident Nos. 20054 and 30318 only):
■ Semi -volatile organic compounds (SVOCs) by EPA 625 and
■ Volatile petroleum hydrocarbons (VPH) and extractable petroleum hydrocarbons
(EPH) by the Massachusetts Department of Environmental Protection (MADEP)
method.
3.2 WATER SUPPLY WELL SAMPLING
Two water supply wells are located within 1,500 feet downgradient of the release area
(Figure 3). One well serves 1205 NC Highway 61 South and the other well serves both 1301 and
1305 Piney Grove Road. Potable wells were purged for ten minutes prior to samples being
collected on November 13, 2012. Influent samples (1301 Piney Grove Road -IN and 1205 NC
Highway 61 South -IN) were collected prior to filtration, mid -stream samples (1301 Piney Grove
Road -MID and 1205 NC Highway 61 South -MID) were collected after the first filter and before
the second, and effluent samples (1301 Piney Grove Road-EFF and 1205 NC Highway 61 South-
EFF) were collected after the third filter, prior to entering the residence. Samples were submitted
to Accutest for laboratory analysis of VOCs by Standard Method 620013, as described above.
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SECTIONTHREE sampling and Analysis Procedures
3.3 REMEDIAL SYSTEM SAMPLING
Remedial system influent and effluent sampling activities were not conducted during the May
2013 event due to system shutdown.
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SECTIOMFOUR
4.1 GAUGING RESULTS
Sampling and Analysis Results
Depth -to -groundwater and groundwater elevation data for the May 2013 event are provided in
Table 2 and historical groundwater elevations are presented in Appendices Al through A3.
Water levels in the monitoring wells ranged from 2.23 (MW-10) to 15,23 (VE-1) feet below top
of casing (ft btoc). Based on these measurements, groundwater flow is toward the southeast as
shown on Figure 4. This direction of groundwater flow is consistent with previous groundwater
gauging events.
4.2 GROUNDWATER ANALYTICAL RESULTS
URS Corporation validated analytical results from the May 2013 groundwater monitoring event
at the Site. The data review was modeled after the USEPA Contract Laboratory Program (CLP)
National Functional Guideline (NFG).fbr Superfund Organic Methods Data Review (EPA, June
2008). Qualitative and quantitative limitations associated with the analytical results were
determined based on the results of specific quality control (QC) criteria. Accuracy was
determined from the review of spike recoveries. Precision was based on the evaluation of
laboratory and field duplicate results. Representativeness was evaluated from the review of
holding times and blank data. Sample results have been qualified based on the results of the data
review process. Qualified data are valid and usable for their intended purpose. Laboratory
analytical reports and chain of custody documents are provided in Appendix B.
A summary of field measurements, including pH, specific conductance, and temperature is
provided in Table 3_ The May 2013 analytical results from the groundwater samples are
Compared to the 15A NCAC 02L .0202 Groundwater Quality (NC 2L) Standards in Table 4. A
historical summary of groundwater analytical results is provided as Appendices C1 through C4.
Concentrations of benzene. isopropyl ether (IPE), MTBE, total xylenes, ethylbenzene, and/or
naphthalene were above their respective NC 2L standards in eight (8) of the 19 monitoring wells
sampled in May 2013. Concentrations of bis(2-Ethylhexyl)phthalate, I-Methyinapthalene,
2-Methylnapthalene, and/or naphthalene were above their respective NC 2L Standards in five (5)
of the twelve (12) monitoring wells sampled for SVOCs. Aliphatics C9-C18 were detected above
NC 2L standards in monitoring wells AGM-RW, DDMW-2, USTMW-1, USTMW-2, and
USTMW-4. Aliphatics C9-C22 were detected above NC 2L in AGM-RW, CSAMW-1,
DDMW-2, MW-10, USTMW-1, USTMW-2, and USTMW-4. Benzene, IPE, MTBE,
naphthalene, and total xylenes isoconcentration maps from the May 2013 sampling event are
presented as Figures 5 through 9, respectively.
Hydrographs of dissolved constituents of concern (COC) concentrations and depth -to -water
versus time for monitoring wells MW-2R and MW-3 are provided as Figures 10 and 11,
respectively. CDC concentrations in both wells have decreased overall; however, some analytes
(naphthalene in MW-3 as well as toluene and MTBE in MW-2R) have slightly increased since
the previous sampling event.
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SECTIONFOUR Sampling and Analysis Results
4.3 WATER SUPPLY WELL ANALYTICAL RESULTS
Tables 5A and SS provide summaries of analytical results of the POE system sampling event (at
1301 Piney Grove Road and 1205 NC Highway 51 South) on May 21, 2013. The only analyte
detected in either well alcove NC 21, Standards was 1,2-dichloroethane in the water supply well
located at I301 Piney Grove Road.
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SECTIQMFIVE Remedial System Perlermance
The DPVE system was started on June 28, 2002, and operated until September 29, 2010.
NCDENR approved the suspension of the DPVE based on previously presented data via email on
October 15, 2010. System O&M site visits and summaries are currently suspended at the Site.
However, based on discussions between HP, URS, and NCDENR in the fall of 2012, the system
may be reactivated in 2013 due to increasing concentrations in MW-2R. URS is evaluating
options for system upgrades or replacement.
The POE systems O&M summaries are included in Table 6. Filters were checked at each POE
system approximately once a month between January and June 2013, and were changed out at
1205 NC Highway 61 South and at 1301/1305 Piney Grove on January 21, February 28, March
28, April 26, and June 27, 2013.
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SECTIONS IX Risk Classification
The current risk classification for the Site is high due to the presence of two private potable water
supply wells (Piedmont Geologic, February 2001 ) located down gradient within 1,500 feet of the
Site, as shown in Appendix D. Seven potable wells are located within 1,000 feet of the Site,
however they are all located up -gradient of the Site. The closest wells are located approximately
550 feet to the north (Appendix D, Parcels 14 and 11).
As shown on Figures S through 9, the results of groundwater samples taken from upgradient
monitoring wells are well below NC 2L Standards and are generally below method detection
limits. The pumping of area water supply wells does not appear to influence groundwater flow
beneath the Site. Current groundwater flow direction is toward the southeast and is consistent
with previous groundwater gauging events. Therefore, the risk to these potential receptors north
of the Site is expected to be low.
An intermittent stream is located approximately 1,000 feet east of the Site. The risk of the release
impacting the stream is estimated to be low based on the distance from the release and overall
decreasing concentrations in groundwater observed in monitoring wells.
The installation of POE systems has decreased the risk to potential receptors associated with
potable wells at 1301 Piney Grove Road and 1205 NC Highway 61 South. Analysis of
groundwater samples collected after treatment at 1301 Piney Grove Road and 1205 NC Hwy 61
South did exhibit an NC 2L Standard exceedence for 1,2-dichloroethane in the water supply well
at 1301 Piney Grove Road. No other analytes were present above the NC 2L Standards prior to
treatment in either supply well.
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sECTICMSEVEN
Well 101e0FRY Inspection
Due to the heavy automobile and truck traffic at the Site, the integrity of many monitoring well
pads and monitoring wells themselves have become compromised. Therefore, between July 9
and 11, 2013 the following activities occurred:
The concrete pads and flush -mount protective covers were replaced on monitoring
wells RW-1R, AGM-RW, VE-1, MW-6, MW-7, and MW-15, and
Monitoring wells MW-Z, MW-4, SV-1, OW-lA, and DW-113 were properly
abandoned with a bentonite grout mixture according to NCDENR regulations.
SAEDACCQ of Fort Mill, South Carolina completed the monitoring well repairs and
abandonments under the supervision of URS staff. The well abandonment records are presented
as Appendix E.
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SECTIONEIGHT
Conclusions
After reviewing the current and historical data, URS has reached the following conclusions:
• Groundwater flow beneath the Site is toward the southeast, consistent with previous
groundwater gauging events.
• Treatment systems installed at 1301 Piney Grove Road and 1205 NC Highway 61
South are working effectively at eliminating contaminant concentrations.
• Benzene, MTBE, and naphthalene remain at concentrations above the NC 2L
standards in the area west of the dispenser island and extending to the southeast at the
Site.
• The farthest down -gradient onsite well. MW-8, has had no detectable concentrations
of dissolved hydrocarbons with the exception of naphthalene in 2000.
• The last exceedance of NC 2L Standards in monitoring well VE-1 was in October
2007 for naphthalene.
■ Monitoring well MW-6 has had no concentrations above NC 2L standards with the
exception of naphthalene, last observed in March 1995.
• Based on the above conclusions, constituents of concern appear to be contained at the
Site.
■ The DPVE system was temporarily suspended on September 29, 2010, due to plume
stabilization and low COC concentrations detected in air and groundwater. However.
sampling events indicate increases in COCs, particularly benzene and MTBE.
UnP:19PI mJo tsVNCM13G3. MN. Wh"L NCO.$ fkUvmbkWanuM to June 1013 C W Bepo3IWP p13lr3 AR.SH Jan -Jun 2013.d" 8-1

SECTION N I NE Recommendatlons
Based on the above conclusions, URS recommends:
+ Continued semi-annual groundwater monitoring of Site wells in accordance with the
Site CAPS and sampling plan presented as Table 7.
+ Reduction from quarterly to semi-annual sampling events for TA wells pertaining to
NCDENR Incident No. 20054. BP and TA will be on the same sampling Schedule,
thus eliminating the need for multiple mobilizations.
Continued operation and maintenance and semi-annual groundwater monitoring
(performance sampling) of the two active downgradient potable water supply wells
located at 1301 Piney Grove Road and 1205 NC Highway 61 South.
+ On -site system reactivation or remedial alternatives should be implemented moving
forward.
■ Removal of ORC socks related to Incident No. 30318 in October 2013, prior to semi-
annual groundwater sampling in November 2013.
I= N:%U"mjmbANC1013f.3. M1% WhiLwu4 ti[-�,s.R DM%erWmVanuan m June 2013 GW Reput%BP141363.ARSM Jan. Jan 21,13.d" 9-1

SECTICNTEN
References
Carpenter, P.A., 1982, Geologic Map of Region G, North Carolina; North Carolina Department of
Natural Resources and Community Development, Division of Land Uses, Geological Survey
Section, Regional Geology Series 2.
CRA Services, 1999, Comprehensive Site Assessment Report Addendum, June 18, 1999,
Matrix Technologies, Inc., I993, Comprehensive Site Assessment, November 15, 1993.
Piedmont Geologic, P.C., 2001 Corrective Action Plan, February 14, 200I .
Piedmont Geologic, P.C., 2001 B, Revised Corrective Action Plan, July 15, 2001.
US EPA, 2008, National Functional Guidelines, for Superfund Organic Methods Data Review, US EPA,
June 2008.
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TABLES

TABLE 1
WELL CONSTRUCTION INFORMATION
Former BP Site No. 01363
1101 NC Highway 61
Whitsett, North Carolina
Well
ID
Date
Completed
Well
Type
Total
Depth (ft bgs)
Casing
Diameter (in)
Screen
Interval (ft bgs)
TOC
Elevevation (ft)
MW-2R
12i 11i00
111
25
4
10-215
93.92
M W-3
10/31 /90
If
26
4
11-26
91.13
MW-4
I W-11-40
14
a _5
4
5-t:+
+W:044
MW-6
6/17/91
11
25
4
5-25
91.28
MW-7
6/12/91
11
24
4
9-24
89.95
M W-8
W 17/91
11
23
4
8-23
87.92
MW-9
114100
11
15
2
10-15
90.43
MW-9❑
115100
I11
50
2
40-50
90.84
MW-10
114100
11
15
2
10-15
91.36
MW-11
114100
11
14
2
10-14
94.21
MW-15
NR
11
NS
2
NS
92.24
RW-1R
NR
11
20
2
10-20
92.17
VE-1
6/18/91
IL
40
2
33-40
90.98
VEW-1
NR
11
15
2
NS
96.29
4
1"224
9 i .0 i
OW !A
5/16,01
II
2-y
-
3-2
41::_'
USTMW-1
NR
NR
12.5
a
NR
NS
USTMW-2
NR
NR
12.4
4
NR
NS
USTMW-4
NR
NR
6.7
4
NR
NS
AGM-RW
NR
II
NS
4
NR
92.70
CSAMW-1
NR
11
31
2
16 - 31
94.18
CSAMW-2
NR
1I1
70
2
60 - 70
97.75
CSAMW-3
N R
11
25
2
10 - 25
98.39
CSAMW-4
NR
111
75
2
65 - 75
99.09
DDMW-2
NR
NR
29.65
2
1518 - 29.65
97.78
NOTES:
TOC = top of well casing
ft bgs = feet below ground surface
in = inches
ft = feet
NS = well not surveyed
NR = no retard
4V 4 = Abandonded 7/9/13
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TABLE 2
GROUNDWATER ELEVATION DATA
May 21, 2013
Former BP Site No. 01363
1101 NC Highway 61
Whitsett, North Carolina
Well TOC . Depth to Depth to LNAPL Groundwater
ID Elevation (ft) LNAPL (ft btoc) Water (ft btoc) Thickness (ft) Elevation tft)
MW-2R
93.92
ND
11.87
ND
82.05
MW-3
91.13
N❑
13.02
N❑
78.11
MW4
100.00
ND
NM
N❑
NM
MW-6
9L28
N❑
8.28
N❑
83.00
MW-8
87.92
ND
11.45
N❑
76.47
RW-1R
92.17
ND
12.66
N❑
79.51
VE-1
90,98
ND
15.23
ND
75.75
VEW-1
96.29
ND
7.92
N❑
88.37
MW-10
91.36
ND
2.23
ND
89.13
MW-11
94,21
N❑
4.34
ND
K87
M W-15
92.24
N D
2.79
ND
89.45
USTMW-1
NS
ND
3.97
ND
NS
USTMW-2
NS
ND
3.49
ND
NS
USTMW-4
NS
N❑
3.52
N❑
NS
AGM-RW
92,70
ND
3.72
ND
88.98
CSAMW-1
94.19
ND
7.33
N❑
86.85
CSAMW-2
97.75
ND
12.47
ND
85.28
CSAMW-3
98.39
N❑
6.91
ND
91.48
CSAMW4
99.09
N❑
11.03
ND
88.06
DDMW-2
97.78
N❑
5.69
ND
92.09
NOTES:
TOC = top of well casing
LNAPL = light non -aqueous phase liquid
ft = feet
ft btoc = feet below top of casing
ND = not detected
NM = not measured
NS = well not surveyed
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