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Home My WebLink AboutNC0003425_Correspondence_20210625ROY COOPER Governor JOHN NICHOLSON Interim Secretary S. DANIEL SMITH Director NORTH CAROLINA Environmental Quality June 25, 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 Dear Ms. Bednarcik: Subject: Final NPDES Major Modification Permit NC0003425 Roxboro Steam Electric Generating Plant Person County Facility Class I The Division of Water Resources is forwarding herewith the Final Major Modification for Roxboro 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 the following significant changes from your Draft Permit: • The optimization requirement and the reopener clause were added for the FGD Effluent Pages (Internal Outfall 010 and Internal Outfall 011) in response to the SELC comments. The Final Major Modification maintains the following significant changes contained in the Draft Permit: 1). The bottom ash purge water was added to the list of the contributing sources of wastewater to the Lined Retention Basin. Per updated 40 CFR 423.13(k)(2)(i)(A) (updated on 10/13/2020), the discharge of pollutants in bottom ash transport water from a properly installed, operated, and maintained bottom ash system is authorized to maintain system water chemistry where installed equipment at the facility is unable to manage pH, corrosive substances, substances or conditions causing scaling, or fine particulates to below levels which impact system operation or maintenance. G=D.E NORTH CAROIJNA Department a/ Environmental Duality 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 2). The Technology Based Effluent Limits for Total Arsenic, Total Mercury, Total Selenium, and Nitrate/nitrite as N were adjusted for Internal Outfall 010 and Internal Outfall 011 (FGD wastewater) in accordance with updated 40 CFR 423.13(g)(1)(i). 3). The flow limit for the Internal Outfall 002 was increased from 2.0 MGD to 3.0 MGD to accommodate large storm events. In addition, the interstitial flow volume reporting was added to this outfall. 4). The header for the Condition A. (1) was corrected to allow for the complete ash excavation from the East Ash Basin Extension and for the discharge of industrial stormwater from the landfill 5). The monthly instream monitoring location name was changed from 6B to F2 (Special Condition A. (18)). 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