MO-8166_36757_G_NORR_20190325_NORR

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
MICHAEL SCOTT
Director
Monroe Oil Company, Inc.
P.O. Box 1109
Monroe, NC 28111-1109
Attn: Olin Furr
Dear Mr. Furr:
NORTH CAROLINA
Environmental Quality
March 25, 2019
Re: Notice of Regulatory Requirements
15A NCAC 2L .0407(b)
Risk -based Assessment and Corrective Action
for Petroleum Underground Storage Tanks
Amoco #9
7810 Lyles Lane, Concord
Cabarrus County
Incident Number: 36757
Risk Classification: High
The UST Section, Division of Waste Management (DWM), Mooresville Regional Office (MRO) received the
January 18, 2019 Groundwater Monitoring Report on January 25, 2018. The report recommending implementation of the
proposed Corrective Action Plan and continued semiannual groundwater sampling was reviewed and approved on March
25, 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 Amoco #9 site is a retail gasoline and convenience store. A petroleum release occurred at the site in
September 2009, due to a third party motor vehicle colliding with a petroleum dispenser at the site (dispenser #1).
The third party has been identified, and EMC Insurance is investigating the identified third party for insurance
coverage.
Surface water bodies are not located within a 250-foot radius of the site. The closest surface water feature is a
drainage ditch situated approximately 360 feet northwest of the UST basin. The property slopes to the south,
therefore, stormwater from the site and adjacent properties would be expected to flow towards the south. The
surface water body was neither impacted nor significantly threatened by the subject release.
The site is not located within a wellhead protection area. One water supply well, formerly used for irrigation
purposes, is located within 250 feet of the UST basin. Based on information provided by the owner of this well,
the well is damaged and not currently in service. No other water supply wells were identified within 1000 feet of
the site. The subject site and all adjacent properties utilize public water supplies for potable water.
NORTHCAROUNAD_E Q�I
DapRbnant of Environmental Duallry
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

• Groundwater in the shallow aquifer beneath the site has historically been inferred to flow predominantly toward
the south. However, water level data suggests the water table beneath the Amoco #9 property itself is locally
influenced. This is most likely due to natural and/or manmade structures in the subsurface. Local mounding of
the water table near the UST basin is not considered to be unusual, given the differences between the hydraulic
conductivity and porosity of the UST basin backfill materials, and the native soil at the site.
• Historically, the bulk of the dissolved -phase petroleum plume in groundwater beneath the site is situated on the
Amoco #9 site in the vicinity of the initial spill area, with the geometry of the plume being enlarged toward the
South and Southeast.
• HES prepared and submitted a Corrective Action Plan (CAP) that has been reviewed and approved by the
NCDEQ — Mooresville Regional Office. An agreement with the property owner (The Bermuda Corporation) is
being negotiated for the implementation of the CAP.
• Twelve monitoring wells have been installed at the site (I I EPA Type II (MW-1 is 30', MW-I 1 is 44', remainder
are 20'), & 1 EPA Type III (MW-1D is 40')).
• The most recent groundwater monitoring event was completed on December 18, 2018. None of the monitoring
wells contained any free product.
• Monitoring wells MW-1, MW-1D, MW-7, and MW-8 were unable to be sampled during the December 18, 2018
sampling event due to damage caused by repaving activities on the property.
• One dissolved phase petroleum constituent was detected in site during the December 18, 2018 monitoring event
(MW-3 MTBE=43µg/L) at a concentration greater than the respective NCAC 2L Standard.
Per this Notice of Regulatory Requirements:
• Continue sampling monitoring wells on a semi-annual basis (next sampling event June 2019).
• Reinstall monitoring well MW-1 near its current location and reinstall MW-1D (place within the inferred
MTBE plume boundaries).
• Add one new monitoring well on the western side of the MTBE plume in on the Sonny's BBQ property.
• Seek permission to sample the irrigation well located at Sonny's BBQ. Seek permission to abandon the
water supply well. Make sure that this well's location is shown on future site maps.
• Make sure that dates in the report match those of site sampling events and the current year.
• The next remediation monitoring report is due no later than July 31, 2019.
Failure to comply with the State's rules in the manner and time specified may result in the assessment of civil
penalties and/or the use of other enforcement mechanisms.
If you have any questions regarding trust fund eligibility or reimbursement from the Commercial Leaking
Petroleum Underground Storage Tank Cleanup Funds, please contact the UST Section Trust Fund Branch at (919) 707-
8171. 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.Beverlygricdenr. og_v or telephone at [phone].
Sincerely,
dl ,�_/1176 . 31_,flod�,
Trudy Beverly, L.G.
Hydrogeologist
Mooresville Regional Office
UST Section, Division of Waste Management, NCDEQ
cc: Suzie Gibson, EMC Insurance Company, P.O. Box 621210, Charlotte, NC 28262-0120
Joe Beaman & Bill Frederick, Highlands Environmental Solutions, Inc., 8410-D Falls of Neuse Road,
Raleigh, NC 27615 (via email)
Mike Downs, Cabarrus County Manager (via email)
David Troutman, Cabarrus County Health Department (via email)
NQRTHCARQUNAD_E Q��
DBparb—d o/ EnvkW—MI Dual
North Carolina Department of Environmental Quality I Division of Waste Management
Mooresville Regional Office 1 610 East Center Avenue, Suite 301 I Mooresville, North Carolina 28115
704.663.1699

Beverly, Trudy
From: Beverly, Trudy
Sent: Monday, March 25, 2019 12:30 PM
To: 'Joe Beaman'; 'William Frederick'; 'Mike Downs'; 'David Troutman'
Subject: Amoco #9 - UST Incident #36757 - Notice of Regulatory Requirements
Attachments: MO-8166_36575_G_NORR_20190325_NORR.pdf
Please see the attached Notice of Regulatory Requirements letter for Amoco #9 (UST Incident #36757) located at 7810
Lyles Lane in Concord, Cabarrus County.
Trudy
DE
Department,of Ervirmimenlal dual ity
liar i*, Lam.
K
usift im mvalrwAh offm
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-hr
Email correspondence to and from this address is subject to the
North Carolina Public Pecords Law and male be disclosed to third parties.
Office Mailing Address:
610 East Center Avenue, Suite 301
Mooresville, NC 28115
Branch's Underground Storage Tanks Website Address: h!Ws:Hdeq.nc.gov/about/divisions/waste-management/ust
Branch's Above Ground Storage Tanks Website Address: https:Hdeq.nc.gov/about/divisions/waste-management/ust/ast-program
INTERACTIVE MAPS WITH DWM SITES AND PERMITTED FACILITIES:
https://deq.nc.gov/about/divisions/waste-management/waste-management-rules-data/waste-mana eg ment- ig s 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):
hILtps://edocs.deq.nc.gov/WasteManagement/Search.aspx
Document Submittal & UST File Names for Laserfiche Policies:
httDs:Hfiles.nc. eov/ncdea/Waste°/`2OManaeement/DWM/UST/Corrective%2OAction/Electronic%2ODocument%2OSubmittal%2OMe
mo%20Update.pdf
httns:Hfiles.nc. eov/ncdea/Waste%2OManaizement/DWM/UST/Corrective%2OAction/UST%20file%20names%20for/`2OLaserfiche.d
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