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Home My WebLink AboutNCS000580_Permit MODIFICATION to Add SDO 002_20190321ROY COOPER Governor MICHAEL S. REGAN Secretary S. DANIEL SMITH Interim Director Mr. Tom Copolo General Manager, Mayo Steam Station Duke Energy Carolinas, LLC 10660 Boston Road Roxboro, NC 27574 Dear Mr. Copolo: NORTH CAROLINA Environmental Quality March 21, 2019 Subject: NPDES Stormwater Permit Permit No. NCS000580 Minor Modification Mayo Steam Station Person County The Division of Energy, Mineral, and Land Resources' Stormwater Program received your request for a minor modification to permit no. NCS000580 on December 20, 2018. The request was to add a new stormwater discharge outfall, Outfall 002 to Bowes Branch, to the permit. The Division has reviewed and approved your request. 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). This modification includes the following changes from your current permit: Modification to the permit in Part II on Page 6 of 15, to include stormwater Outfall 002 in the monitoring requirements. Revisions to the permit cover page to reflect the additional receiving waters and latest amendment date. Please replace these two pages in the current permit with the revised pages and discard the older pages. If any parts, measurement frequencies, or sampling requirements contained in this modification are unacceptable to you, then you have the right to file a petition for a contested case with the Office of Administrative Hearings within thirty (30) days following receipt of this letter. This petition must conform to the requirements of Chapter 150B of the North Carolina General Statutes. Petitions must be timely filed with the Office of Administrative Hearings, Post Office Drawer 11666, Raleigh, North Carolina 27604. If you do not file a petition within the required time, the agency decision shall be final and binding. Ole �� North Carolina Department of Environmental Quality I Division of Energy, Mineral and Land Resources 512 North Salisbury Street 1 1612 Mail Service Center I Raleigh, North Carolina 27699-1612 NCIPTH CARGI.INA _ oeuanmem of Envimnnlan(al Quai� /*151 919.707.9200 This permit is not transferable except after notice to the Division. Part III, B.2. addresses the requirements to be followed in case of change in ownership or control of this discharge. This permit modification does not affect the legal requirements to obtain other permits which may be required by this Division, or permits required by the Division of Water Resources, Coastal Area Management Act, or any other federal or local governmental permit that may be required. If you have any questions or comments concerning this permit modification, contact Bethany Georgoulias at (919) 707-3641 or at bethany.georgouliasPncdenr gov. Sincerely, for S. Daniel mith, Director Division of Energy, Mineral, and Land Resources cc: Raleigh Regional Office, DEMLR Stormwater Program Sam Sampath, Ph.D., EPA Region IV, 61 Forsyth Street, Atlanta, GA 30303 Lori Tollie, Duke Energy (via email) DEMLR Stormwater Program Permit No. NCS000580 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT QUALITY DIVISION OF ENERGY, MINERAL, AND LAND RESOURCES PERMIT TO DISCHARGE STORMWATER UNDER THE NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM In compliance with the provisions of North Carolina General Statute 143-215.1, other lawful standards and regulations promulgated and adopted by the North Carolina Environmental Management Commission, and the Federal Water Pollution Control Act, as amended, Duke Energy Progress, LLC. is hereby authorized to discharge stormwater from a facility located at Mayo Electric Generating Plant 10660 Boston Road Roxboro, NC 27574 Person County to receiving waters designated as Mayo Reservoir and Bowes Branch, class WS-V and class C waters, respectively, in the Roanoke River Basin, in accordance with the discharge limitations, monitoring requirements, and other conditions set forth in Parts I, II, III, and IV hereof. This permit shall become effective January 27, 2017 This permit and the authorization to discharge shall expire at midnight on December 31, 2021. Amended and signed this 215Y day of March 2019. S. Daniel Smith, Interim Director Division of Energy, Mineral, and Land Resources By the Authority of the Environmental Management Commission Permit No. NCS000580 Outfalls 004, 005 006c, 006d, and 006e are included in wastewater NPDES permit NCO038377 due to potential non-stormwater discharge. Outfall 006b does not have a defined point source discharge. Without a point source this outfall is not covered by the NPDES stormwater program and is not included in this permit. The following parameters shall be monitored during a measurable storm event from Outfall 006a and Outfall 010 to the Mayo Reservoir, and Outfall 002 to Bowes Branch. Table 1. Analytical Monitoring Requirements Outfall 006a, Outfall 010, Outfall 002 Discharge i Measurement Sample Sample Characteristics Units Fre uenc 1 Type2 Location3 PCBs1 µg/1 semi-annual1 Grab SDO Copper, Total Recoverable m L semi-annual Grab SDO Selenium, Total Recoverable m L semi-annual Grab SDO Mercury, Total Recoverable, by mg/L semi-annual Grab SDO EPA Method 1631E Zinc, Total Recoverable m L semi-annual Grab SDO Total Suspended Solids (TSS) semi-annual (quarterly, Grab SDO mg/L during coal or ash transport only) Non -Polar Oil & Grease by EPA Method 1664 SGT-HEM mg/L semi-annual Grab SDO pH semi-annual (quarterly, standard during coal or Grab SDO ash transport only) Total Rainfa114 semi-annual (quarterly, Rain inches during coal or _ ash transport Gauge only) 40 CFR Part 423 Appendix A: semi-annual (quarterly, Additional Priority Pollutant Metals - mg/L during coal or Grab SDO Ag, As, Be, Cd, Cr, Ni, Pb, Sb, Tl5 ash transport only) Boron5 semi-annual (quarterly, mg/L during coal or Grab SDO ash transport only) Footnotes: Part II Page 6 of 15