MO-6731_27502_G_NORR_20190807_NORR

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
MICHAEL SCOTT
Director
Service Distributing Company, Inc.
Post Office Box 310
Albemarle, NC 28002
Attn: Robert E. Gresham
Dear Mr. Gresham:
NORTH CAROLINA
Environmental Quality
August 7, 2019
Re: Notice of Regulatory Requirements
15A NCAC 2L .0407(b)
Risk -based Assessment and Corrective Action
for Petroleum Underground Storage Tanks
Servco No. 00311
24 North Church Street, Concord
Cabarrus County
Incident Number: 27502
Risk Classification: High
The UST Section, Division of Waste Management (DWM), Mooresville Regional Office (MRO)
received the May 22, 2019 Monitoring Report on May 24, 2019. The report recommending incident
closure through a Notice of Residual Petroleum and issuance of a No Further Action for the incident was
reviewed and approved on August 7, 2019. 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:
• The results of the laboratory data indicate that the groundwater samples collected from
monitoring wells MW-8, MW-9 and MW-IOR were above NCAC 2L standards for benzene and
that samples collected from monitoring well MW-IOR exceeded the NCAC 2B standard for
toluene. The laboratory analysis further indicates NCAC 2L standards for ethylbenzene and total
xylenes were exceeded in the groundwater sample collected from MW-1OR and for naphthalene
in the groundwater samples collected from MW-8 and MW-IOR. MTBE exceeded NCAC 2L
standards in the groundwater samples collected from MW-9; and PCE exceeded the NCAC 2L
standard in samples collected from MW-2, MW-4, MW-5, MW-7 and MW-9. None of the
groundwater samples collected indicated any constituents exceeding Gross Contamination Levels
(GCLs). No free product was measured in the gauged monitoring wells during the May 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

Review of the current data indicates that the predominant groundwater flow at the site is in a
northeasterly direction.
Based on previous receptor surveys completed by ECEA, there is one water supply well utilized
for irrigation purposes only and located approximately 170 feet upgradient of the release source
area. The closest surface water body appears to be an unnamed tributary of Three Mile Branch
located approximately 500 feet north of the subject property based on a review of the USGS
topographic maps. It appears the surface water is classified as class "C" surface water. Based on
the presence of the irrigation well located within 250 feet of the source area, the site is ranked as a
"High" risk site.
The soil and groundwater remediation system, consisting of a soil vapor extraction and air sparge
system was started on June 28, 2010. The system was operational after belts were installed
during the July and August site visits. Based on the TA dated September 13, 2018 Excel shut the
system down on September 27, 2018. The system was off during the May 2019 sampling event.
Current laboratory analytical data indicates that overall dissolved phase hydrocarbon constituents
(primarily BTEX and MTBE) continues to occur at the site and are decreasing with some
seasonal fluctuations. Remaining constituent levels exceed NCAC 2L standards at multiple
locations for various constituents and at one monitor well exceed NCAC 2B standards (benzene
and toluene).
Per this Notice of Regulatory Requirements:
• Sample monitoring wells MW-8, MW-9, and MW-10R for the November 2019 sampling event.
• The remediation system can remain off. The AS/SVE remediation system must be properly
maintained and the switch ready in case future use is necessary.
• The next monitoring report is due no later than November 30, 2019 (letter report).
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,
� 141 4"�_
Trudy Beverly, L.G.
Hydrogeologist
Mooresville Regional Office
UST Section, Division of Waste Management, NCDEQ
cc: Mike Stanforth & Donna Farris, Excel Civil & Environmental Associates, PLLC (via email)
Mike Downs, Cabarrus County Manager (via email)
David Troutman, Cabarrus County Health Department (via email)
Ed Watson, NCDEQ-Division of Water Quality -Regional Operations Section (via email)
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: Wednesday, August 7, 2019 9:48 AM
To: Mike Stanforth ([e-mail]); Donna Farris
([e-mail]); Mike Downs; David Troutman; Watson, Edward M
Subject: Servco No. 00311 - UST Incident #27502 — Notice of Regulatory Requirements
Attachments: MO-6731 _27502_G_NORR_20190807_NORR.pdf
Please see the attached Notice of Regulatory Requirements letter for Servco No. 00311 located at 24 North
Church Street in Concord, Cabarrus County, North Carolina (Incident #27502).
Trudy
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Finail conespondenr a to and from this address is subject to the
North Caroline Public Records Lew 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:Hdeq.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-
rp o,gram
INTERACTIVE MAPS WITH DWM SITES AND PERMITTED FACILITIES:
https://deg.nc.gov/about/divisions/waste-management/waste-management-rules-data/waste-mana e,� ment ig s-maps
File Review Procedures:
hiips: //deq. nc.,gov/about/divisions/waste-management/ust/file-review-procedures#mooresville-regional-office
ONLINE ACCESS TO UST SECTION DOCUMENTS (Laserfiche):
https://edocs.deq.nc.gov/WasteManagement/Search.aspx
Document Submittal & UST File Names for Laserfiche Policies:
httns://files.nc. Gov/ncdea/Waste%2OManaizement/DWMiUST/Corrective%2OAction/Electronic%2ODocument%2OSubmittal
%20Memo%2OUpdate.pdf
httDs:Hfiles.nc. eov/ncdea/Waste%2OManaizement/DWM/UST/Corrective%2OAction/UST%20file%20names%20for%2OLas
erfiche.docx