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Home My WebLink AboutNC0004987_DRAFT Permit_20211228ROY COOPER Governor MICHAEL S. REGAN Secretary S. DANIEL SMITH Director NORTH CAROLINA Environmental Quality December 28, 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: Draft NPDES Permit Permit NC004987 Marshall Steam Station Catawba County Facility Class I Enclosed with this letter is a copy of the Draft Permit for your facility. Please review the draft very carefully to ensure thorough understanding of the conditions and requirements it contains. The draft Permit contains the following significant changes from your current permit: • The Effluent Page for the decanting (Outfall 002) was removed from the permit since the facility transitioned to the dewatering process. • Limits for Total Arsenic have been removed from the permit based on the results of the Reasonable Potential Analysis (Outfall 002). • 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. • The Outfall 003 status was changed from internal to external to reflect the current conditions at the facility. LD_E NORTH CAROLINA Department of Environmental Walk\ s de." 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 • 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, MS, 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. Please provide any comments you have regarding the draft permit to this office by January 31, 2022. At this time, the Division is also publishing a notice in the newspapers of general circulation in Catawba County, inviting public comment on the draft major modification. Following the 30-day comment period, we will review all pertinent comments received and take appropriate action on the permit modification. The NPDES Standard Conditions (Parts II, III, and IV) are not included with this draft. They can be found at the following link if you would like to review them in conjunction with this draft permit. https: / /bit.ly/2BZ4xxx If you have any questions about the NPDES permit process, please contact me at the following e- mail address: sergei.chernikov@a,ncdenr.gov, or telephone number: 919-707-3606. Sincerely, Sergei Chernikov, Ph.D. Environmental Engineer III Complex NPDES Permitting Unit cc: NPDES Files EPA Region IV (e-copy) Mooresville Regional Office / Surface Water Protection (e-copy) Aquatic Toxicology Unit (e-copy) TACU (e-copy)