MO-6731_27502_G_NORR_20180911_NORR

ROY COOPER
Governor
MICHAEL S. REGAN
Secrerary
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
September 11, 2018
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
July 19, 2018 Groundwater Monitoring and Corrective Action Performance Reports on July 24, 2018. The reports
recommending shutdown of the remediation system at this time, continued semiannual groundwater sampling, and an
evaluation of overall plume stability and associated risk to potential receptors be conducted based on the results from the
next sampling event (November 2018) was reviewed and approved on September 5, 2018. 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 sample collected from monitoring well MW-IOR
was above NCAC 2L standards for benzene. The laboratory analysis further indicates NCAC 2L standards for
ethylbenzene and total xylenes were exceeded in the groundwater sample collected from MW-IOR 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 MW-IOR; and PCE exceeded the NCAC 2L
standard in samples collected from MW-2, MW-4, MW-5, MW-7, MW-9 and MW-12. 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 June 2018 sampling event.
E cew 0- f
NORTH CAROL!NA� �
unry of EmlmmYeHsl 9� r
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

• 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 within 250 feet of the subject property. In addition, according to the USGS, the closest
surface water body appears to be an unnamed tributary of Three Mile Branch located approximately 500 feet
north of the subject property. 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 SVE and AS systems were down during the January and March site visits due to
electrical issues. The system was operational during the June site visit, but is currently down due to broken belts.
The system is currently down awaiting new belts. Based on recovered vapor sampling results, approximately 3.35
pounds of vapor phase hydrocarbons have been recovered.
• 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.
Per this Notice of Regulatory Requirements:
• Continue sampling monitoring wells on a semi-annual basis (next sampling event November 2018).
• The remediation system can remain off at present. The operational status of the remediation system will
be revisited after the next report review.
• The next report should include an evaluation of the overall plume stability and an evaluation of risk to
potential receptors.
• The next remediation monitoring report is due no later than November 30, 2018.
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. Beverl ncdenr.gov or telephone at [phone].
Sincerely,,,
/
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)
NORTH C.4R0.'+1A�E Q�
uf F, r,nn eHs 9Nor
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

Beverly, Trudy
From: Beverly, Trudy
Sent: Tuesday, September 11, 2018 2:39 PM
To: Mike Stanforth ([e-mail]); Donna Farris ([e-mail])
Cc: '[e-mail]'
Subject: Servco 311 - UST Incident #27502
Attachments: MO-6731 _27502_G_NORR_20180911 _NORR.pdf
Mike and Donna,
Please see the attached Notice of Regulatory Requirements letter for Servco 311 located at 24 North Church Street in
Concord, Cabarrus County.
Trudy
Q�5
Trudy Beverly, L.G.
Hydrogeologist, Division of Waste Management
North Carolina Department of Environment Quality
Underground Storage Tanks Section
Corrective Action Branch
Mooresville Regional Office
[phone] (Office)
Trudv.Beve rlv(@ncdenr.gov
Er7k' d Cprr85'porOiar7 to and from this aGdresS iS subject to the
Noah CaralOa Pubko Records Law anal rr;ay be d obscd to third parties.
Branch's Underground Storage Tanks Website Address: https://deg.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://deg.nc.gov/about/divisions/waste-management/waste-management-rules-data/waste-management-gis-maps
File Review Procedures:
https://deg.nc.gov/about/divisions/waste-management/ust/file-review-procedures#mooresville-regional-office
ONLINE ACCESS TO UST SECTION DOCUMENTS (Laserfiche):
https://edocs.deg.nc.gov/WasteManagement/Search.aspx
Document Submittal & UST File Names for Laserfiche Policies:
https://files.nc.aov/ncdea/Waste%20Manaaement/DWM/UST/Corrective%2OAction/Electronic%2ODocument%2OSubmi
ttal%20Memo%20Update.pdf
https://files.nc.eov/ncdea/Waste%20ManaLyement/DWM/UST/Corrective%2OAction/UST%20file%20names%20for%20
Laserfiche.docx