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HomeMy WebLinkAboutMO-6731_27502_G_NORR_20190807_NORRROY 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 (704) 235-2182. 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 (mstanforth@excelengr.com); Donna Farris (dfarris@excelengr.com); 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 E QW;N RO�INA UepeMxnl�o Environmental Duality Tn* ' *, Lam. Noah Cadn DWKMM 0EMMa==1 Qdky varsedm moarellll & Rgomd Omiee (7" 23S,21i2 (Ol 1Und" 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