MO-8827_40338_G_NORR_20200214_Notice of Regulatory Requirements

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
MICHAEL SCOTT
Director
SixOOneStop, Inc.
Attn: Marc Glover, Registered Agent
5661 Highway 601 S.
Concord, NC 28025
(via email)
Dear Mr. Glover:
NORTH CAROLINA
Environmental Quality
February 14, 2020
Re: Notice of Regulatory Requirements
15A NCAC 2L .0407(b)
Risk -based Assessment and Corrective Action
for Petroleum Underground Storage Tanks
Six-O-One Stop
5661 South Highway 601, Concord
Cabarrus County
Incident Number: 40338
Risk Classification: High
The UST Section, Division of Waste Management (DWM), Mooresville Regional Office
(MRO) received the March 16, 2018 Monitoring Reports on February 12, 2020. The report
recommending preparation of a full scale CAP designed to reduce dissolved groundwater
concentrations to below the 2L standard was reviewed and approved on February 12, 2020. The
paper report copies will be maintained in the MRO. The electronic copies have been loaded to the
DWM's electronic document storage system (Laserfiche).
The report states:
• On January 21, 2018, CESI collected groundwater samples from eight monitoring wells
(MW-1, MW-2, MW-3, MW-4, MW-5, MW-6, MW-7, and MW-8). Analysis of
groundwater samples from the monitoring wells revealed gasoline parameters greater than
the North Carolina Administrative Code (NCAC) 15A 2L standard in wells MW-1, MW-2,
MW-7, and MW-8. The benzene concentration in well MW-2 was reported at a
concentration greater than the GCL for benzene. None of the other tested parameters
exceeded GCL's.
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

• CESI also collected a groundwater sample from water supply well 2. No parameters were
reported above the sample detection limit. CESI attempted to retrieve a water sample from
the onsite water supply well (well 1) but was unable to lower a bailer because of interference
from the downhole pump cable and discharge line. This well is disconnected from the
electrical supply and has reportedly not been used for many years. The owner of water well
number 3 refused CESI access to the water well. The owner of water well number 4 stated
that the well is not used and is not accessible. Interviews with the owners of water supply
wells 2 and 3 on January 21, 2018, stated that they did not want to connect to municipal
water.
• Depth to groundwater measurements at the site revealed depth to water approximately 23 feet
below grade. Groundwater flow direction is toward the east.
• Free product has not been observed onsite. Based on the groundwater analytical results of
samples collected January 21, 2018, the areal extent of dissolved hydrocarbons appears to be
defined except to the south for benzene and MTBE and to the west for MTBE. However,
based on the low concentrations on the perimeter wells, it appears that the dissolved
hydrocarbon plume has not migrated offsite. The vertical extent of impact has been defined
in the deep screen well MW-8.
• No remediation has been implemented at this site.
Per this Notice of Regulatory Requirements:
• Continue semi-annual groundwater sampling/monitoring. Sample monitoring wells and all
water supply wells within 1,000 feet of the release.
• The next sampling event for the Monitoring Report shall be conducted in March 2020. The
next Monitoring Report is due no later than April 30, 2020.
• Please update the plume stability analysis in the next monitoring report. Include the March
2020 groundwater data in the stability analysis.
• Information was received reporting that a water line does not exist along Cold Springs Road.
The water supply source for these properties remains unclear. Please update the receptor
information to identify all water supply wells within 1,000 feet of the release and provide
clarification for water usage at each property. Include this information in the April 30, 2020
Monitoring Report.
• Connections to public water must be evaluated as a potential cost effective alternative
moving forward to help determine whether corrective action through active remediation is
necessary. The goal of public water connections is to minimize the risk to potentially
threatened water supply wells on nearby properties. You must reasonably attempt to obtain
agreements for connections to public water supply wells used for potable purposes located
within 1,000 feet downgradient of the source area. Additionally, an attempt must be made to
obtain agreements with owners to abandon all water supply wells within 250 feet of the
release.
• Obtaining public water connection agreements is the first step towards determining the
feasibility of a water line extension. Further evaluation will be requested at a later time if
water connections and/or abandonments cannot be completed and alternative active
remediation options would likely be necessary.
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.
D 1E
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

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, Q,
�� Y" '6w U
Trudy Beverly, L.G.
Hydrogeologist
Mooresville Regional Office
UST Section, Division of Waste Management, NCDEQ
cc: Steven Irminger, CESI Civil-Geotechnical-Surveying (via email)
Crystal Swinger, Cabarrus County Environmental Health (via email)
Mike Downs, Cabarrus County Manager (via email)
D F.
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 14, 2020 11:21 AM
To: Marc Glover
Cc: Steven Irminger; Chrystal Swinger; Mike Downs
Subject: Six-O-One Stop - Incident #40338 — Notice of Regulatory Requirements
Attachments: MO-8827_40338_G_NORR_20200214_Notice of Regulatory Requirements.pdf
Please see the attached Notice of Regulatory Requirements letter for Six-O-One Stop located at 5661 South
Highway 601, Concord, Cabarrus County, North Carolina (Incident #40338).
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 everlykncdenr. 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://deq.nc.gov/about/divisions/waste-management/ust/ast-proeram
INTERACTIVE MAPS WITH DWM SITES AND PERMITTED FACILITIES:
https://deo.nc. eov/about/divisions/waste-management/waste-manaeement-rules-data/waste-manaeement-eis-mans
File Review Procedures:
https://deq.nc. gov/about/divisions/waste-manaaement/ust/file-review-procedures#mooresville-regional-office
ONLINE ACCESS TO UST SECTION DOCUMENTS (Laserfiche):
httns://deo.nc. eov/about/divisions/waste-manaeement/laserfiche
Document Submittal & UST File Names for Laserfiche Policies:
htip s: //files.nc. gov/ncdeq/ W aste%2OMana,gement/D W M/U S T/Corrective%2OAction/Electronic%2ODocument%2OSubniittal%2OMemo%2OUpdate.pdf
https:Hfiles.nc. gov/ncdeq/Waste%20Management/DWM/UST/Corrective%2OAction/UST%20filc%20names%20for%2OLaserfiche.docx