MO-1810_13400_G_C_20190125_Report Receipt Letter

ROY COOPER NORTH CAROLINA
Governor Environmental Quality
MICHAEL S. REGAN
Secrerary
MICHAEL SCOTT
Director
January 25, 2019
Security Oil Company
Attn: Dale Carpenter
Post Office Box 5028
Concord, NC 28027
Re: Acknowledgement of Report Receipt
Rocky River Grocery
7939 Rocky River Rd., Concord
Cabarrus County
Incident number: 13400
Risk Classification: High
Dear Mr. Carpenter:
The UST Section, Division of Waste Management (DWM), Mooresville Regional Office (MRO)
received the December 19, 2018 Monitoring Report on December 27, 2018. The report recommending
continued semi-annual monitoring and Advanced ORC socks or 0-sox be installed in MW-2A and MW-8 was
reviewed and approved on January 25, 2019. The paper report copy will be maintained in the MRO. The
electronic copy has been loaded to the electronic document storage system (Laserfiche).
The report indicates:
• Free product was not detected in the on -site monitoring wells during the November 2018 sampling event.
MADEP aliphatic (C5-C8) and aromatic (C9-C22) constituent concentrations decreased in monitoring wells
MW-2A and MW-8 when compared to the May 2018 sampling event. Aliphatic (CS- C8) and aromatic (C9-
C22) both exceed their respective 21, Standard in monitoring well MW-2A and MW-8. Only aromatic (C9-
C22) exceeds the 21, Standard in monitoring well MW-8.
• Overall volatile organic compound (VOC) concentrations have slightly increased in monitoring well MW-8
and decreased in monitoring well MW-2A but remain to be below 21, Standards. The Naphthalene
concentration in MW-8 was detected above the 2L Standard during the November 2078 sampling event, an
increase from the previous sampling event.
• Total lead was not detected in any of the monitoring wells sampled during the November 2018 sampling
event. Historically, there does not appear to be a correlation between the total lead detections and
petroleum constituent detections. The presence of total lead is considered to be naturally -occurring.
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North Carolina Department of Environmental Quality I Division of Waste Management
Mooresville Regional 0Mce 1 610 East Center Avenue, Suite 301 1 Mooresville. North Carolina 28115
704.663.1699

• Dissolved phase petroleum constituent compound concentrations have remained non -detect in monitoring
wells MW-1, MW-3A, MW-4A, MW-5A, MW-6A, MW-7, DMW-1 and DMW-2.
The next semi-annual groundwater monitoring event shall occur in May 2019 with the
Groundwater Monitoring Report submittal due to this office by June 30, 2019. 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.
Please note that the AS/SVE remediation system must be properly maintained and the switch ready
in case future use is necessary.
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. BeverlyPncdenr.gov or
telephone at [phone].
Sincerely,
U `�
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)
Matthew Smith & Thomas Witner, 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