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HomeMy WebLinkAboutNC0004987_Final Permit_20220411ROY COOPER. Governor ELIZABETH S. BISER Secretary S. DANIEL SMITH Director NORTH CAROLINA Environmental Quality April 11, 2022 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 Permit Permit NC0004987 Marshall Steam Station Catawba County Facility Grade PC-II/WW-III Dear Ms. Bednarcik: The Division of Water Resources is forwarding herewith the Final Permit for Marshall Steam Station. This permit 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 Permit contains the following significant changes from your Draft Permit: • Limits for Total Arsenic have been re -instated in the permit based on the results of the updated Reasonable Potential Analysis (Outfall 002). The Final Permit maintains the following significant changes contained in the Draft Permit: • The Effluent Page for the decanting (Outfall 002) was removed from the permit since the facility transitioned to the dewatering process. • The monitoring frequency for the Total Copper, Total Selenium, Total Iron, and Total Mercury was reduced from Weekly to Monthly based on the results of the Reasonable Potential Analysis (Outfall 002). • Limits for Total Copper have been converted from Water -Quality Based Limits to Technology Based Limits based on the results of the Reasonable Potential Analysis (Outfall 005). • The Instream Waste Concentrations for the Whole Effluent Toxicity Test was changed based on the highest reported flow data (Outfall 002 and Outfall 005). • Limits for Total Iron and Total Copper and Total Iron have been removed from Outfall 002 since ash basin no longer receives any wastewater. NORTH 1:tE nepertment of Environmental CAROLINA ouat� North Carolina Department of Environmental Quality Division of Water Resources 512 North Salisbury Street 11617 Mail Service Center I Raleigh, North Carolina 27699-1617 919.707.9000 • The Outfall 003 status was changed from internal to external to reflect the current conditions at the facility. • The monitoring for the Total Cadmium, Total Chromium, Total Iron, Total Lead, Total Nickel, Total Silver, and Total Zinc have been removed from the permit based on the results of the Reasonable Potential Analysis (Outfall 005). • The monitoring frequency for the Sulfates, Chloride, Bromide, TDS, and Total Hardness was reduced from Monthly to Quarterly based on the results of the Reasonable Potential Analysis and review of the effluent data (Outfall 005). • The Chronic Toxicity monitoring frequency was reduced from Monthly to Quarterly to be consistent with other major industrial permits (Outfall 005). • The Section A. (19.) entitled Ash Settling Basin was removed from the permit since wastewater is no longer discharged to the Ash Basin. • The Section A. (20.) entitled Chemical Metal Cleaning Waste was removed from the permit since wastewater is no longer discharged to the Ash Basin. • The instream monitoring frequency was reduced from Monthly to Quarterly based on the review of the instream data that demonstrated a lack of noticeable impact from the facility on the receiving stream. 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 Mooresville Regional Office/Water Quality WSS/Aquatic Toxicology Unit (e-copy) EPA Region IV (e-copy) NORTH Department of Emb,nmentel Wally Sincerely, PotArtvAL for Ricliarci t . t gers, Director Division of Water Resources DocuSigned by: r 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