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HomeMy WebLinkAboutNC0004987_DRAFT Major Modification_20210209ROY COOPER Governor MICHAEL S. REGAN Secretary 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 9, 2021 Subject: Draft NPDES Major Modification Permit NC0004987 Marshall Steam Station Catawba County Facility Class I The Division has received your request for a Major Modification of the subject permit. Enclosed with this letter is the modified permit. Please review this permit modification carefully to ensure thorough understanding of the conditions and requirements it contains. The draft permit modification contains the following significant changes from your current permit: • The bottom ash purge was added to the list of the contributing sources of wastewater to the Lined Retention Basin (Outfall 005) . Per updated 40 CFR 423.13 (k) (2) (i) (A), 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. • The Technology Based Effluent Limits for Total Arsenic, Total Mercury, Total Selenium, and Nitrate/nitrite as N for Internal Outfall 006 (FGD wastewater) were adjusted in accordance with updated 40 CFR 423.13. • The pH limit for FGD wastewater was eliminated (Internal Outfall 006) to correct an error. LD_E NORTH CAROLINA Department of Environmental Quay 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 Please provide any comments you have regarding the draft permit modification to this office by March 15, 2021. 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 Modification. Following the 30-day comment period, we will review all pertinent comments received and take appropriate action on the permit modification. 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 Industrial NPDES Permitting Unit cc: Central Files NPDES Files EPA Region IV (e-copy) Mooresville Regional Office/Water Quality (e-copy) Mooresville Regional Office/PWS (e-copy) WSS/Aquatic Toxicology Unit (e-copy)