MO-4269_13403_G_NORR_20200207_Notice of Regulatory Requirements

ROY COOPER NORTH CAROLINA
Governor Environmental Quality
MICHAEL S. REGAN
Secretary
MICHAEL SCOTT
Director
February 7, 2020
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 January 31, 2020 Monitoring Report on February 5, 2020. The report recommending
continuing semi-annual sampling of monitoring and supply wells (June and December) and sampling
monitoring and supply wells was reviewed and approved on February 7, 2020. 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
source of the MTBE in WSW-1. Due to the no power at the well, WSW-1 was not sampled
during the December 2019 sampling event.
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

• Dissolved phase petroleum constituent compounds were detected in concentrations above the
15A NCAC 2L Groundwater Standards (2L Standards) in monitoring wells MW-IOB, MW-13,
and MW-16.
• The plume appears to be relatively stable. The current contaminant mass has decreased from
approximately 3,400 grams in July 2019 to approximately 1,800 grams in December 2019.
• The concentration of Benzene increased above the 2L Standard in MW-13 since the July 2019
sampling event.
• Diisopropyl ether (IPE) concentrations have decreased to below 2L standards since the July 2019
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 June 2020 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 July 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.Beverlykncdenr. og_v or telephone at [phone].
Sincerely, It
�WQ,t, U
Trudy Beverly, L.G.
Hydrogeologist
Mooresville Regional Office
UST Section, Division of Waste Management, NCDEQ
cc: Mike Downs, Cabarrus County Manager (via email)
Chrystal Swinger, Cabarrus County Environmental Health (via email)
Kevin Stachura & David Stoner, Shield Engineering, Inc. (via email)
pannwY*�` n�ia.nama aal�
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: Friday, February 7, 2020 12:48 PM
To: Robbie Barbour
Cc: David Stoner; Kevin Stachura; Chrystal Swinger; Mike Downs
Subject: Pitt Stop BP - Incident #13403 — Notice of Regulatory Requirements
Attachments: MO-4269_13403_G_NORR_20200207_Notice of Regulatory Requirements.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.
D-. E W Hydrogeologist, Division of Waste Management
North Carolina Department of Environmental Quality
UST Section, Mooresville Regional Office
704.235.2182 (Office)
Trudy.B everly(cbncdenn 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: https://deq.nc.gov/about/divisions/waste-management/ust
Branch's Above Ground Storage Tanks Website Address: https://deg.nc.gov/about/divisions/waste-management/ust/ast-program
INTERACTIVE MAPS WITH DWM SITES AND PERMITTED FACILITIES:
https://dea.nc. eov/about/divisions/waste-management/waste-manaeement-rules-data/waste-manaeement-eis-mans
File Review Procedures:
https://deq.ne. gov/about/divisions/waste-management/ust/file-review-procedures#mooresville-regional-office
ONLINE ACCESS TO UST SECTION DOCUMENTS (Laserfiche):
https: //dea.nc. giov/about/divisions/waste-mana2ement/laserfiche
Document Submittal & UST File Names for Laserfiche Policies:
https://files.ne. gov/ncdeq/ W aste%20Management/D WMIUST/Corrective%2OActionBlectronic%2ODocument%2OSubniittal%2OMemo%2OUpdate.pdf
https://files.nc. gov/ncdeq/Waste%20Management/DWM/UST/Corrective%2OAction/UST%20file%20names%20for%2OLaserfiche.docx