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HomeMy WebLinkAboutNC0004979_Modification_20200207 (2)ROY COOPER Governor MICHAEL S. REGAN Secretory S. DANIEL SMITH Director Mr. Paul Draovitch, Senior Vice President Environmental, Health and Safety Duke Energy Carolinas, LLC Mail Code EC13K P.O. Box 1006 Charlotte, North Carolina 28201-1006 Dear Mr. Draovitch: NORTH CAROLINA Environmental Quality February 7, 2020 Subject: Permit Major Modification Permit NC0004979 Allen Steam Station Gaston County Facility Class I We have received your request for a Major Modification to extend compliance schedule for FGD wastewater from 02/28/2020 to 11 /01 /2020 due to the latest EPA changes to 40 CFR 423. The request has been granted. Enclosed with this letter is 1 page that includes necessary changes. Please replace the existing permit page with the modified page. The permit modification contains the following significant changes from your current permit: • Extension of compliance schedule for FGD wastewater from 02/28/2020 to 11 /01 /2020 due to the latest EPA changes to 40 CFR 423. No other changes have been made. This permit modification is issued pursuant to the requirements of North Carolina General Statute 143-215.1 and the Memorandum of Agreement between North Carolina and the U.S. Environmental Protection Agency. Please take notice that this permit is not transferable. Part II, E.4. addresses the requirements to be followed in case of change in ownership or control of this discharge. North Carolina Department of Environmental Quality I Division of Water Resources e-�-oPUE 512 North Salisbury Street 1 1617 Mail Service Center I Raleigh, North Carolina 27699-1617 919.707.9000 If you have any questions or need additional information, please contact Sergei Chernikov, telephone number (919) 707-3606 or email: sergei.chernikov@ncdenr.gov. Sincerely, S. aniel Smi elect —or ivision of Water Resources cc: Central Files NPDES Files Mooresville Regional Office/Water Quality WSS/Aquatic Toxicology Unit (e-copy) EPA Region IV (e-copy) Permit NC0004979 A. (8.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Internal Outfall 005) [15A NCAC 02B .0400 et seq., 02B .0500 et seq.] During the period beginning on the effective date of this permit and lasting until permit expiration, the Permittee is authorized to discharge from internal outfall 005- treated FGD wet scrubber wastewater to ash settling basin. Such discharges shall be limited and monitored2 by the Permittee as specified below: EFFLUENT CHARACTERISTICS LIMITS MONITORING REQUIREMENTS Monthly Average Daily I Maximum Measurement Frequency Sample Type Sample Location' Flow, MGD Monitor & Report Monthly Pump logs or similar reading-, Effluent Total Arsenic 8.0 µg/L4 11.0 µg/L4 Quarterly Grab Effluent Total Mercury3, ng/L 356.0 ng/L4 788.0 ng/L4 Quarterly Grab Effluent Total Selenium 12.0 µg/L4 23.0 µg/L4 Quarterly Grab Effluent Nitrate/nitrite as N 4.4 mg/L4 17.0 mg/L4 Quarterly Grab Effluent pH Monthly Grab Effluent Footnotes: 1. "Effluent" shall be defined as the discharge from the FGD wastewater,treatment system prior to commingling with other waste streams. 2. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application system. Please See Special Condition A. (26.). 3. The facility shall use method 1631E. 4. In accord with the Steam Electric Effluent Limitations Guidelines for FGD wastewater (40 C.F.R. 423), these limits shall become effective on November 1, 2020. This permit may be reopened and modified if changes are made to 40 C.F.R. 423. This permit shall be reopened and modified to reflect any changes in the 40 CFR 423. All flows shall be reported on monthly DMRs. If no flow occurs during a given month, the words "no flow" shall be clearly written on the front of the DMR. All samples shall be of a representative discharge. The facilfty shall continue tooperate the FGD treatments stem until all coal-fired units are retired. Page 1 of 1