MO-4269_13403_G_NORR_20190924_NORR

ROY COOPER NORTH CAROLINA
Governor Environmental Quality
MICHAEL S. REGAN
Secretary
MICHAEL SCOTT
Director
September 24, 2019
Carolina Oil Company
Attn: Robbie Barbour
Post Office Box 5010
Concord, NC 28027
(via Email)
Re: Notice of Regulatory Requirements
15A NCAC 2L .0407(b)
Risk -based Assessment and Corrective
Action for Petroleum Underground
Storage Tanks
Pitt Stop BP
3609 Highway 29 S., Concord
Cabarrus County
Incident number: 13403
Risk Classification: High
Dear Mr. Barbour:
The UST Section, Division of Waste Management (DWM), Mooresville Regional Office (MRO)
received the July 31, 2019 Monitoring Report on August 2, 2019 and the September 13, 2019 Receptor
Survey Update on September 17, 2019. The report recommending continuing semi-annual sampling of
monitoring and supply wells (June and December) and sampling monitoring and supply wells prior to the
recommended Mobile Multi -Phase Extraction (MMPE) of in July and January was reviewed and
approved on September 17, 2019. The receptor survey requesting lowering the risk of the site was
reviewed and approved on September 18, 2019. The paper report copy will be maintained in the MRO.
The electronic copy has been loaded to the DWM's electronic document storage system (Laserfiche).
The report indicates:
• The site is a High Risk site because of supply well WSW-1 being located within 500 feet
of the site. WSW -1 has also been historically impacted with MTBE. There are other
petroleum fueling stations at this traffic intersection so we are uncertain of the true
North Carolina Department of Environmental Quality I Division of Waste Management
Mooresville Regional Office 1 610 East Center Avenue, Suite 301 1 Mooresville, North Carolina 28115
704.663.1699

source of the MTBE in WSW-1. Due to the no power at the well, WSW-1 was not sampled
during the July 2019 sampling event.
• Dissolved phase petroleum constituent compounds were detected in concentrations above the
15A NCAC 2L Groundwater Standards (2L Standards) in monitoring wells MW-IOB, MW-16,
and MW-17.
• The current contaminant mass, as calculated from the July 2, 2019 routine sampling event and
areal plume area (combination of benzene and MTBE plumes) is approximately 3,368 grams and
4,950 square feet, respectively. This contaminant mass is an increase from the January 2019
sampling event which was approximately 538 grams.
• The total VOC concentrations prior to the most recent MMPE event for the monitoring wells with
select contaminant levels above the 2L Standards decreased in MW-IOB, MW-13, MW-16 and
slightly increased in MW-17 since the previous routine sampling event.
Per this Notice of Regulatory Requirements:
• Continue semi-annual monitoring (June and December) by conducting a groundwater
sampling event of all the incident monitoring and supply wells in December 2019 to
monitor plume stability and WSW-1 contaminant concentrations. Sample Monitoring
wells MW-2, MW-6, MW-IOB, MW-13, MW-14, MW-15, MW-16, MW-17, and well
WSW-1.
• The next monitoring report is due by January 31, 2020.
Please note that sampling and correction action must be conducted in accordance with the
Guidelines for Assessment and Corrective Action for UST Releases. Failure to comply in the manner and
time specified may result in the assessment of civil penalties and/or the use of the other enforcement
mechanisms.
If you have any questions regarding trust fund eligibility or reimbursement from the Commercial
or Noncommercial Leaking Petroleum Underground Storage Tank Cleanup Funds, please contact the
UST Section Trust Fund Branch at [phone]. If you have any questions regarding the actions that
must be taken or the rules mentioned in this letter, please contact me by email at
Trudy.Beverly(&ncdenr.gov or telephone at [phone].
Sincerely,
y'C &+
Trudy Beverly, L.G.
Hydrogeologist
Mooresville Regional Office
UST Section, Division of Waste Management, NCDEQ
cc: Mike Downs, Cabarrus County Manager (via email)
David Troutman, Cabarrus County Health Department (via email)
Danny Hefner, James Gamertsfelder & David Stoner, Shield Engineering, Inc. (via email)
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North Carolina Department of Environmental Quality I Division of Waste Management
Mooresville Regional Office 1 610 East Center Avenue, Suite 301 1 Mooresville, North Carolina 28115
704.663.1699

Beverly, Trudy
From: Beverly, Trudy
Sent: Tuesday, September 24, 2019 11:33 AM
To: Robbie Barbour
Cc: David Stoner; Mike Downs; David M Troutman; Danny Hefner; James
Gamertsfelder
Subject: Pitt Stop BP - Incident #13403 — Notice of Regulatory Requirements
Attachments: MO-4269_13403_G_NORR_20190924_NORR.pdf
Mr. Barbour,
Please see the attached Notice of Regulatory requirements for Pitt Stop BP (Incident #13403) located at 3609
Highway 29 S., Concord, Cabarrus County, NC.
Trudy
Trudy Beverly, L.G.
Hydrogeologist, Division of Waste Management
North Carolina Department of Environmental Quality
UST Section, Mooresville Regional Office
704.235.2182 (Office)
Trudy. B ev erly(d nc denr. gov
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
Office Mailing Address:
610 East Center Avenue, Suite 301
Mooresville, NC 28115
Branch's Underground Storage Tanks Website Address: hops://deg.nc.gov/about/divisions/waste-management/ust
Branch's Above Ground Storage Tanks Website Address: https://deq.nc.gov/about/divisions/waste-management/ust/ast-program
INTERACTIVE MAPS WITH DWM SITES AND PERMITTED FACILITIES:
https://dea.nc. gov/about/divisions/waste-management/waste-management-rules-data/waste-management-gis-mans
File Review Procedures:
https://deq.nc. gov/about/divisions/waste-management/ust/file-review-procedures#mooresville-regional-office
ONLINE ACCESS TO UST SECTION DOCUMENTS (Laserfiche):
httos://edocs.dea.nc. gov/WasteManagement/Search.asox
Document Submittal & UST File Names for Laserfiche Policies:
https:Hfiles.nc.gov/ncdeq/Waste%2OManaizement/DViM/UST/Corrective%2OAction/Electronic%2ODocument%2OSubmittal%2OMemo%2OUpdate.pdf
https:Hfiles.nc.gov/ncdeq/Waste%20Management/DWMfUST/Corrective%2OAction/UST%2Ofile%20names%20for%2OLaserf che.docx