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HomeMy WebLinkAboutNC0004987_Permit (Issuance)_20210518PERMIT No. NC0004987 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENTAL QUALITY DIVISION OF WATER RESOURCES PERMIT TO DISCHARGE WASTEWATER UNDER THE NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM In compliance with the provisions of North Carolina General Statute 143-215.1, other lawful standards and regulations promulgated and adopted by the North Carolina Environmental Management Commission, and the Federal Water Pollution Control Act, as amended, Duke Energy Carolinas, LLC is hereby authorized to discharge wastewater from a facility located at Marshall Steam Station At the intersection of NC Highway 150 and NCSR 1841 Terrell Catawba County to receiving waters designated as the Catawba River (Lake Norman) in the Catawba River Basin in accordance with effluent limitations, monitoring requirements, and other applicable conditions set forth in Parts I, II, and III hereof. This modification shall become effective June 1, 2021. This permit modification and authorization to discharge shall expire at midnight on September 30, 2021. Signed this day May 18, 2021. ,—DocuSigned by: for D. Daniel Smith, Director Division of Water Resources By Authority of the Environmental Management Commission Page 1 of 3 PERMIT No. NC0004987 SUPPLEMENT TO PERMIT COVER SHEET All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked, and as of this issuance, any previously issued permit bearing this number is no longer effective. Therefore, the exclusive authority to operate and discharge from this facility arises under the permit conditions, requirements, terms, and provisions included herein. Duke Energy Carolinas, LLC is hereby authorized to: 1. Continue to discharge: • Outfall 001: once -through cooling water and intake screen backwash • Outfall 002: treated wastewater (consisting of metal cleaning wastes, coal pile runoff, ash transport water, storm water, low volume wastes, landfill leachate, extracted groundwater from remediation activities, and FGD wet scrubber wastewater) from the ash settling basin. • Outfall 005. Upon completion of construction, discharge from the new lined retention basin. Basin will accept wastes from holding basin (coal pile runoff), ash transport water, various sumps, stormwater runoff, FGD wastewater, bottom ash purge from the submerged flight conveyers (purge volume not to exceed 10% of the water systems volume), and various low volume wastes such as boiler blowdown, oily waste treatment, wastes/backwash from the water treatment processes, plant area wash down water, equipment heat exchanger water, landfill leachate, and ash transport water. Upon completion of construction all waste streams previously discharged to the ash basin, will be re-routed to the new retention basin. During the transition period, wastewater from the ash pond can also be discharged (Outfall 002). • Outfalls 002A and 002B: yard sump overflows. • Outfall 007: the emergency spillway of the Ash Pond. The spillway is designed for a flood greater than 100-year event. Sampling of this spillway is waived due to unsafe conditions associated with sampling during an overflow event. • Internal outfall 001 /001A. Yard sump (wastewater from the yard sump 2, the yard sump 3, the fly ash silo yard sump, and stormwater) discharging to the retention basin. • Internal Outfall 003: non -contact cooling water from the induced draft fan control house to the intake for cooling water pumps. • Internal Outfall 006: treated FGD wet scrubber wastewater to the new lined retention basin. • Internal Outfall 010 from Holding Basin: coal pile runoff, and stormwater to the retention basin. From a facility located at Duke Energy's Marshall Steam Station at the intersection of NC Highway 150 and NCSR 1841 in Terrell, Catawba County; Page 2 of 3 PERMIT No. NC0004987 2. Discharge from said treatment works at the locations specified on the attached map into the Catawba River (Lake Norman) which is classified WS- IV and B CA waters in the Catawba River Basin. Page 3 of 3