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HomeMy WebLinkAboutNC0038377_Final Cover Letter - 2021_20211215ROY COOPER Governor JOHN NICHOLSON Interim Secretary S. DANIEL SMITH Director NORTH CAROLINA Environmental Quality December 3, 2021 Ms. Jessica Bednarcik, Senior Vice President Environmental, Health and Safety Duke Energy Carolinas, LLC Mail Code EC13K P.O. Box 1006 Charlotte, North Carolina 28201-1006 Subject: Final NPDES Major Modification Permit NC0038377 Mayo Steam Electric Generating Plant Person County Facility Class I Dear Ms. Bednarcik: The Division of Water Resources is forwarding herewith the Final Major Modification for Mayo Steam Electric Generating Plant. This 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 dated October 15, 2007 (or as subsequently amended). The Final Major Modification contains no significant changes from your Draft Major Modification. The Final Major Modification maintains the following significant changes contained in the Draft Major Modification: 1. Landfill leachate from the CCR landfill was added as a contributing flow to the lined retention basin. 2. The flow limit for Outfall 002 was increased from 2.0 MGD to 3.0 MGD to accommodate large storm events. The limit was changed from the Daily Maximum to the Monthly Average to be consistent with other Duke permits. 3. Ammonia conversion maintenance drainage was added as a contributing flow to the lined retention basin. 4. The sampling frequency for the domestic package plant (internal Outfall 011) was changed from Weekly to Quarterly to be consistent with other Duke permits. �D_E NORTH CAROLINA Department of Environmental Quality North Carolina Department of Environmental Quality I Division of Water Resources 512 North Salisbury Street 11617 Mail Service Center I Raleigh, North Carolina 27699-1617 919.707.9000 5. Industrial storm water from the CCR landfill was added as a contributing flow to the lined retention basin. 6. The Water Quality Based Effluent Limits for Total Arsenic, Total Chlorides, Total Fluoride, Total Barium, and Total Antimony were added to the permit (Outfall 002A — lined retention basin) based on the results of RPA. If any parts, measurement frequencies, or sampling requirements contained in this permit are unacceptable to you, you have the right to an adjudicatory hearing upon written request within thirty (30) days following receipt of this letter. This request must be in the form of a written petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the office of Administrative Hearings, 6714 Mail Service Center, Raleigh, North Carolina 27699-6714. Unless such a demand is made, this permit shall be final and binding. Please note that this permit is not transferable except after notice to the Division. The Division may require modification or revocation and reissuance of the permit. This permit does not affect the legal requirements to obtain other permits which may be required by the Division of Water Resources or any other Federal, State, or Local governmental regulations. If you have any questions or need additional information, please contact Sergei Chernikov, telephone number (919) 707-3606 or email: sergei.chernikov@ncdenr.gov. cc: Central Files NPDES Files Raleigh Regional Office/Water Quality WSS/Aquatic Toxicology Unit (e-copy) EPA Region IV (e-copy) G=D_E NORTH CAROIJNA Department al Environmental Quality Sincerely, S. Daniel Smith, Director Division of Water Resources North Carolina Department of Environmental Quality I Division of Water Resources 512 North Salisbury Street 11617 Mail Service Center I Raleigh, North Carolina 27699-1617 919.707.9000