RA-3071_20567_CA_MRP_20141205_Terracon FINAL Starflight Self Service Letter Report

SITE VISIT AND RECEPTOR SURVEY UPDATE
LETTER REPORT
Starflight Self Service (Incident #20567)
US Highway 1 and Cedar Lane Road
Cameron, Lee County, North Carolina
December 5, 2014
Terracon Project No. 70149670
Prepared for:
North Carolina Department of Environment and Natural Resources
Division of Waste Management
Raleigh, North Carolina
Prepared by:
Terracon Consultants, Inc.
Raleigh, North Carolina
Terracon Consultants, Inc. 2401 Brentwood Road, Suite 107 Raleigh, NC 27604
P [919] 873 2211 F [919] 873 9555 terracon.com
December 5, 2014
Mr. Mark Petermann
North Carolina Department of Environment and Natural Resources
Division of Waste Management
1637 Mail Service Center
Raleigh, North Carolina 27699-1637
Email:[e-mail]
Re: Site Visit and Receptor Survey Update Letter Report
Starflight Self Service
US Highway 1 and Cedar Lane Road
Cameron, Lee County, North Carolina
UST Incident Number: 20567
Terracon Project No. 70149670
Dear Mr. Petermann:
Terracon Consultants, Inc. (Terracon) is pleased to submit this Letter Report documenting site visit
and receptor survey update activities for the above referenced property. This letter report has been
prepared in general accordance with North Carolina Department of Environment and Natural
Resources (NCDENR), UST Section Guidelines for Assessment and Corrective Action for UST
Releases,dated July 15, 2008, revised December 2013 and Task Authorization No. 01, approved on
October 9, 2014.
The purpose of this letter report is to document site conditions and activities completed by Terracon
during a recent site visit and receptor survey update at the Starflight Self Service site. The site visit
was performed on November 12, 2014 at the Starflight Self Service site located at the intersection of
U.S. Highway 1 (Jefferson Davis Highway) and Cedar Lane Road in Cameron, Lee County, North
Carolina (Figure 1). This letter report was prepared for the site in response to a request by Mr. Mark
Petermann, Incident Manager with the NCDENR Division of Waste Management, State Lead
Program.
The Federal/State-Lead Monitoring Report was prepared in general accordance with the 15A NCAC
2L .0115 regulations and the NCDENR Underground Storage Tank (UST) Section Guidelines for
Assessment and Corrective Action for UST Releases, dated July 15, 2008, revised December 2013,
under the supervision of Mr. Craig D. Eady, a North Carolina licensed professional geologist (North
Carolina License No. 1599).
Starflight Self Service
Cameron, North Carolina
Terracon Project No. 70149670
Incident No. 20567
December 5, 2014
Responsive ■Resourceful ■Reliable 2
Site Setting
The Starflight Self Service site is comprised of undeveloped property located within the North
Carolina Department of Transportation (NCDOT) right-of-way (ROW) on the northeastern quadrant of
the intersection of US Highway 1 and Cedar Lane Road. The site consists of gravel and grassy
areas and is currently being used for the staging of gravel and soil materials by NCDOT.
The surrounding properties primarily consist of undeveloped wooded land with some residential
development. Property to the north and east consists of additional NCDOT ROW property being used
to stage gravel and soil materials followed by wooded land. Property to the south consists of Cedar
Lane Road followed by undeveloped cleared land. Property to the west consists of US Highway 1
followed by undeveloped cleared land. Residential properties are located in the southern and
northwestern vicinities. Rocky Fork Christian Church is located in the eastern vicinity. The site and
surrounding properties are depicted on Figure 2.
Site History
A release from a former on-site UST system was discovered in May 1996 during the completion of a
Preliminary Site Assessment (PSA) by Environmental Investigations, Inc. (EI) on behalf of NCDOT.
According to information contained in the NCDENR UST Section incident file associated with the
site, the site reportedly contained a gasoline retail facility with one 2,000-gallon gasoline, one 2,000-
gallon diesel, one 1,000-gallon gasoline, and two 8,000-gallon gasoline USTs. The EI PSA included
the installation of one groundwater monitoring well, SB-14.
In January 1999, EI supervised the removal of the UST system including the excavation of the on-
site USTs. At the time of the UST system removal, the site contained the abandoned Starflight Self
Service facility. Prior to the excavation of the USTs, approximately 1,190 gallons of residual
materials were pumped from the tanks. Based on field observations of petroleum staining, odors,
and elevated photo-ionization detector (PID) readings, NCDOT authorized EI to excavate additional
soil from around the UST system components (USTs, product lines, and dispenser island). The final
limits of the tank pit excavation measured approximately 60 feet by 45 feet by 9 feet deep, which was
approximately two feet below the observed depth of groundwater, while the final limits of the
dispenser island excavation measured 34 feet by 21 feet, by 9 feet deep. Approximately 262.83 tons
of petroleum-impacted soils were excavated.
Confirmation soil samples were collected from the walls of the UST excavation and from beneath the
dispenser island. Laboratory analysis of the collected samples revealed concentrations of targeted
petroleum compounds to be below the laboratory’s detection limits or below NCDENR’s soil-to-
groundwater Maximum Soil Contaminant Concentrations (MSCCs) with the exception of benzene,
naphthalene, and isopropyl ether (IPE), which were detected slightly above their respective soil-to-
groundwater MSCCs. However, the detected concentrations of these compounds were well below
their respective residential MSCCs.
The only groundwater sample to have been collected at the site consisted of a groundwater sample
collected from SB-14 during the completion of the May 1996 PSA. SB-14 was reportedly installed
Starflight Self Service
Cameron, North Carolina
Terracon Project No. 70149670
Incident No. 20567
December 5, 2014
Responsive ■Resourceful ■Reliable 3
adjacent to the former UST area. Laboratory analytical results of the sample revealed toluene,
ethylbenzene, xylenes, and naphthalene concentrations above NCDENR 2L groundwater standards
(2L standards).
The most recent receptor information, which comes from a January 2009 receptor survey conducted
by ATC Associates, Inc. (ATC), indicates that there are three water supply wells located within 1,000
feet of the source area. One of the wells was reportedly used for irrigation, one was reportedly used
for livestock, and third was reportedly not in use. ATC reported that municipal water is provided to
each of the properties containing the identified water supply wells.
Updated Receptor Survey
Terracon completed an updated receptor survey as part of the recently completed site visit. Four
water-supply wells were identified within 1,500 feet of the UST basin (source area), during
Terracon’s receptor survey. The identified wells were all located over 1,000 feet from the source
area. Two of the wells (WSW-2 and WSW-4) serve as active, potable water sources while one
additional well is active, but is used for irrigation (WSW-3) because the property is connected to
municipal water. The remaining water supply well (WSW-1) is inactive.
Confirmation of the number and location of residences or businesses that utilize well water near the
site was conducted by Terracon during a vehicle/foot reconnaissance along public roads within 1,500
feet of the site. In addition, Terracon contacted the City of Sanford’s Public Works Department, who
provides public water to the area surrounding the site. The City of Sanford’s Public Works
Department provided Terracon with an updated list of public water connections in the vicinity of the
source area. This updated water connection information is presented on Table 1 and is reflected in
the above discussion of active, potable wells in the surrounding vicinity.
Results of the water supply well inventory are presented in Table 1 and well locations are depicted
on Figure 3.
Site Visit Summary
Prior to Terracon’s site visit, an access agreement was obtained from Mr. Marty C. Tillman of
NCDOT. A copy of that agreement is attached to this letter report. Mr. Tillman indicated that the
attached agreement will suffice for site access; however, if future work at the site involves
groundwater monitoring well installation, soils borings, or soil excavations, a NCDOT Encroachment
Agreement will need to be obtained.
Terracon completed a site visit on November 12, 2014. As part of the site visit, Terracon attempted
to locate, gauge, and evaluate the condition of monitoring well SB-14, which had been installed on-
site during the 1996 assessment of the site, as well as document current site conditions and
operations. The site is currently undeveloped and was observed being used by NCDOT to stage
stockpiles of gravel and soil materials. In addition to the stockpiles, the site consists of gravel and
grassy areas.
Starflight Self Service
Cameron, North Carolina
Terracon Project No. 70149670
Incident No. 20567
December 5, 2014
Responsive ■Resourceful ■Reliable 4
At the time of Terracon’ s site visit, indications of monitoring wells or the former locations of the UST
basin, dispenser island, or former service station were not observed. Terracon used historical aerial
photographs and existing site maps to locate such features. It appears that the lone groundwater
sample collected at the site in May 1996 was likely collected from a temporary well location or the
well location has subsequently been destroyed/abandoned.
Conclusions
Terracon has reached the following conclusions based on its review of the existing historical
assessment data gathered at the site along with the information gathered during Terracon’s recent
site visit and receptor survey update:
n Sensitive receptors are not present within 1,000 feet of the identified source area.
n The majority of the contaminated soil encountered during the 1999 UST closure activities
appears to have been excavated as only very low concentrations of benzene, naphthalene,
and IPE were detected in one of the confirmation samples collected following excavation
activities. The identified concentrations of these compounds were well below their respective
residential MSCCs.
n It is possible that petroleum contaminant concentrations remain present in the on-site
groundwater above 2L standards. One groundwater sample has been collected at the site
during an April 1996 assessment, which exhibited concentrations of toluene, ethylbenzene,
total xylenes, and naphthalene above 2L standards. Though it is likely that the
concentrations of these compounds have been greatly reduced on-site due to the excavation
of source area soils during the 1999 UST closure activities and the natural attenuation of
these compounds over the eighteen years since that groundwater sample was collected.
n Existing groundwater monitoring wells were not identified at the site.
Recommendations
Based on the currently available information regarding the site, Terracon recommends the following:
n Based on the lack of sensitive receptors and the relatively low concentrations of petroleum
constituents that may remain in the on-site groundwater, the risk level of the site could be
adjusted to “low” and the site be closed out with a restriction on the use of the groundwater
at the site.
n If NCDENR chooses, an Encroachment Agreement could be obtained from NCDOT for the
installation of temporary or permanent groundwater monitoring wells to verify groundwater
quality at the site prior to pursuing closure of the site. However, locating the precise location
of the former on-site UST system will be difficult due to the demolition of the former Starflight
Self Service facility and the re-grading of the site as part of the realignment of the
intersection of U.S. Highway 1 and Cedar Lane Road.
If you have any questions regarding this report or the assessment activities, please contact us at
919-873-2211.
FIGURES
Copyright:© 2013 National Geographic Society, i-cubed
Site
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1:24,000
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70149670JLF
CMP
JLF
JLF 2401 Brentwood Drive, Suite 107 Raleigh, NC 27612
Phone: [phone] Fax: [phone]
Site Location Map
Starflight Self Service(Incident # 20567)US Highway 1 and Cedar Lane RoadCameron, Lee County, North Carolina
USGS TOPOGRAPHIC MAPMURCHISONTOWN, NC 1957(PHOTOREVISED 1981)
1,000 0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000500Feet
CONTOUR INTERVAL 10 FEET
12/3/2014
SB-14
FORMER
DISPENSER
ISLAND
FORMER SHED
FORMER
AUTO SHOP
FORMER
SERVICE
STATION
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Consulting Engineers and Scientists
Fig No.
2401 BRENTWOOD ROAD, STE. 107 RALEIGH, NC 27604
FAX. [phone]PH. [phone]
SITE PLANJLF
PTK
JLF
JLF
70149670
AS SHOWN
70149670
DECEMBER 2014 2
STARFLIGHT SELF SERVICE (INCIDENT #20567)
US HIGHWAY 1 AND CEDAR LANE ROAD (SR 1182)
CAMERON, LEE COUNTY, NORTH CAROLINA
DIAGRAM IS FOR GENERAL LOCATION ONLY, AND
IS NOT INTENDED FOR CONSTRUCTION PURPOSES
SHALLOW MONITORING WELL FORMER UST
DATA SOURCES:
1) TANK LOCATIONS - ENVIRONMENT INVESTIGATORS
2) IMAGERY - LEE COUNTY GIS
SCALE IN FEET
020 5 2010
500'
1000'
1500'
W
W
W
W
WSW-4
WSW-2
WSW-1
WSW-3
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Date:
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Consulting Engineers and Scientists
Fig No.
2401 BRENTWOOD ROAD, STE. 107 RALEIGH, NC 27604
FAX. [phone]PH. [phone]
WATER SUPPLY WELL LOCATION MAPJLF
PTK
JLF
JLF
70149670
AS SHOWN
70149670
DECEMBER 2014 3
STARFLIGHT SELF SERVICE (INCIDENT #20567)
US HIGHWAY 1 AND CEDAR LANE ROAD (SR 1182)
CAMERON, LEE COUNTY, NORTH CAROLINA
DIAGRAM IS FOR GENERAL LOCATION ONLY, AND
IS NOT INTENDED FOR CONSTRUCTION PURPOSES
WATER SUPPLY WELL DATA SOURCES:
1) IMAGERY - LEE COUNTY GIS
SCALE IN FEET
0500 125 500250W
TABLES
TABLE 1
Water Supply Well Information
Starflight Self Service
Cameron, North Carolina
Terracon Project No. 70149670
NCDENR Incident No. 20567
WSW-1 Wanda K. Requa 4502 Rocky Fork Church Road
Sanford, NC 27330
4502 Rocky Fork Church Road
Sanford, NC 27330 1,150 feet / southeast Inactive 9538-03-9963-00 No municipal water connection
WSW-2 Wanda K. Requa 4502 Rocky Fork Church Road
Sanford, NC 27330
4502 Rocky Fork Church Road
Sanford, NC 27330 1,200 feet / southeast Potable 9538-03-9963-00 No municipal water connection
WSW-3 Rocky Fork Christian Church 4246 Rocky Fork Church Road
Sanford, NC 27330
4204 Rocky Fork Church Road
Sanford, NC 27330 1,325 feet / south Irrigation 9538-14-6866-00 Propety has municipal water connection
WSW-4 Dennis P. Hall 4536 Rocky Fork Church Road
Sanford, NC 27330
4536 Rocky Fork Church Road
Sanford, NC 27330 1,350 feet / south Potable 9538-03-8762-00 No municipal water connection
Well Status/Use Parcel ID NotesWell No.Property Owner Mailing Address Property Address Distance/Directions
from site
ACCESS AGREEMENT
SITE PHOTOGRAPHS
AND FIELD NOTES
Starflight Self Service
Project No. 70149670
Date Photos Taken: November 12, 2014
Photo #1 View of the site from the west Photo #2 View of the site from the north
Photo #3 View of the site from the east Photo #4 View of the site from the south
Photo #5 General view of the site from the
southwest
Photo #6 View of the inactive WSW-1
Starflight Self Service
Project No. 70149670
Date Photos Taken: November 12, 2014
Photo #7 Additional view of the site from
the west
Photo #8 View of the site from the
southeast
Photo #9 View from the site facing south Photo #10 View from the site facing north
Photo #11 View from the site facing east Photo #12 View from the site facing west