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HomeMy WebLinkAboutNC0090000_Public Hearing Summary_20230316 F,NE STATE o p.173 O ti � ti ROY COOPER Governor ELIZABETH S.BISER Secretary *farQmM'410 RICHARD E.ROGERS,JR. NORTH CAROLINA Director Environmental Quality Colonial Pipeline NPDES Permit #NC0090000 Summary Colonial Pipeline has applied to the Division of Water Resources for a National Pollution Discharge Elimination System (NPDES) permit. The proposed permit is required for full implementation of a fuel recovery and groundwater remediation plan that would allow the discharge of treated groundwater to North Prong Clark Creek in the Yadkin-Pee Dee River basin. The proposed permit is part of enforcement actions undertaken by the Department of Environmental Quality (DEQ) against Colonial Pipeline and outlined in a Consent Order resulting from the August 14, 2020 fuel spill in Mecklenburg County, N.C. Cleanup efforts and remediation have been ongoing, with oversight by DEQ's Division of Waste Management. The Consent Order identifies Colonial Pipeline as the responsible party for the spill and subsequent cleanup. The Consent order included a $4.75 million-dollar civil penalty. The permit application required an engineering alternatives analysis be undertaken to ensure the best possible alternative for cleaning up the site is selected. Possible alternatives included: 1) connection to a publicly owner treatment works (POTW), 2) pumping and hauling the treated effluent offsite, 3) land application of treated wastewater, 4) infiltration galleries, 5) closed-loop remediation wells, 6) and a surface water discharge. D E Q�� North Carolina Department of Environmental Quality I Division of Water Resources MSC 1617 1 512 N.Salisbury Street I Raleigh,North Carolina 27699-1617 NORTHCAROLINA 919-707-9000 U¢paNmpn�of EnvlrpnnMp�el apel� Connection to Charlotte Water is prohibited by a sewer use ordinance. Pumping and hauling the treated water would require approximately 115 trucks per day that will be operating 24 hours a day in a residential area. The other alternatives were deemed technically infeasible due to engineering restrictions, lack of available land, and protection of groundwater. Thus, the identified best alternative would be a discharge to surface waters. The groundwater remediation system includes a recovery well system, an oil/water separator with skimmed storage tank for recovered oil, a bag filter bank, an air stripper unit, a thermal oxidizer unit or granular activated carbon units, liquid phase granular activated carbon vessels, and an outfall structure. The draft permit is crafted to protect all appropriate water quality standards by treating for identified petroleum hydrocarbons, toxicants and chlorinated solvents present in the groundwater post spill. Initial groundwater data reviewed for this application indicated that PFAS was not present above practical quantitation limits. Additional data is being collected and analyzed for PFAs contaminant prior to possible issuance of a final permit. Comments received during the public hearing process will be incorporated into the final analysis and decision-making process. ALL DOCUMENTS RELATED TO THIS PERMIT CAN BE FOUND BY ACCESSING THIS QR CODE. ti 'F :n•�ri • L D E Q North Carolina Department of Environmental Quality I Division of Water Resources 512 N.Salisbury Street I Raleigh,North Carolina 27699-1617 NORTH CAROLINA oepa"mem or Enelmnme,01 oearcy 919-707-9000