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Home My WebLink AboutNCS000548_Permit MINOR MOD to Remove SW006 SW009 SW023_20190620ROY COOPER Governor MICHAEL S. REGAN Secretary S. DANIEL SMITH interim Director Mr. Rick Roper, General Manager Duke Energy Carolinas, LLC Marshall Steam Station 8320 East NC Highway 150 Terrell, NC 28682 Dear Mr. Roper: NORTH CAROLINA Environmental Quality June 20, 2019 Subject: NPDES Stormwater Permit Permit No. NCS000548 Minor Modification Marshall Steam Station Catawba County Your request to revise permit no. NCS000548 was received by the Mooresville Regional Office of the Division of Energy, Mineral, and Land Resources on April 17, 2019. Regional Office staff conducted an inspection on May 13, 2019 and concurred with the request to remove the specified outfalls. The modification request was forwarded to the Central Office on May 15, 2019. The Division has reviewed your request to remove Stormwater Outfalls SW006, SW009, and SW023 from Marshall Steam Station's permit and approved the modification. The revised permit pages reflect that stormwater flows from these outfalls have been redirected through the lined retention basin (LRB) to NPDES Wastewater Outfall 005 and to Outfall 003 under permit No. NC0004987. If flow routing or other circumstances change that reintroduce discharges associated with industrial activity from these drainage areas to separate stormwater outfalls, requirements in NCS000548 will apply. This modification includes the following changes from your current permit: • Modifications to the permit in Part II on page 8 of 17, to remove stormwater outfall SWO06 in monitoring requirements. • Modifications to the permit in Part II on pages 9 of 17, to remove stormwater outfall SWO09 in monitoring requirements. • Modifications to the permit in Part II on pages 10 of 17, to remove stormwater outfall SW023 in monitoring requirements. • Revisions to the permit cover page to reflect the latest amendment date. Please replace these pages in the current permit with the revised pages and discard the older pages. NN 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 NORTH CAROI.INA oenamneffl ml 919.707.9200 All other conditions and schedules in the previous permit remain in place and in effect. Per the requirements of the Catawba Riparian Buffer Rule, all stormwater drainage from portions of this site that have been constructed after June 30, 2001, must be discharged through a correctly designed level spreader or another device that meets diffuse flow requirements per 15A NCAC 213.0243. 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. If you have any questions or comments concerning this correspondence, contact Bethany Georgoulias at (919) 707-3641 or at bethany.georgouliasOncdenr gov. Sincerely, for S. Daniel' mith, Director Division of Energy, Mineral, and Land Resources cc: Mooresville Regional Office, DEMLR Stormwater Program Sam Sampath, Ph.D., EPA Region IV, 61 Forsyth Street, Atlanta, GA 30303 Robert Wylie, Duke Energy (via email) Sergei Chernikov, DWR NPDES Complex Permitting Stormwater Program Enclosure Permit No. NCS000580 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES 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 Carolinas, LLC is hereby authorized to discharge stormwater from a facility located at Marshall Steam Station 8320 East NC Highway 150 Terrell, NC Catawba County to receiving waters designated as the Catawba River, a class WS-IV, B, CA stream in the Catawba 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 May 15, 2015. This permit and the authorization to discharge shall expire at midnight on April 30, 2020. Originally issued the 15th day of May 2015; amended and signed this 20th day of June 2019. S. Daniel Smith, Director Division of Energy, Mineral, and Land Resources By the Authority of the Environmental Management Commission Permit No. NCS000548 The following parameters shall be monitored during a measurable storm event from the northern portion of the Warehouse areap designated as outfall SW006 and discharging to the Catawba River (Lake Norman) until this outfall is removed. June 20, 2019: Outfall SW006 has been removed and drainage was redirected to a lined retention basin that discharges through NPDES wastewater Outfall OOS (see Permit No. NC0004987). Table 3 Analvtical Monitoring RenuiremPntc fnr clArnnA Discharge Characteristics Units Measurement Fre uenc 1 Sample Tyve2 Sample Location3 Total Suspended Solids (TSS) m L semi-annual Grab SDO H standard semi-annual Grab SDO Total Rainfa114 inches semi-annual Rain Gauge - Footnotes: 1-4 Refer to Table 1, Footnotes 1-4 The following parameters shall be monitored during a measurable storm event from the switchyard area. paved Powerhouse yard areas and areas extending west to the gypsum haul road, designated as outfall SW007 and discharging to the Catawba River (Lake Norman). Table 4 Analvtical Monitoring ReauiremPntc fnr cwnn7 Discharge Characteristics Units Measurement Fre uenc 1 Sample TVVe2 Sample Location3 PCBs1 µg/l semi-annual Grab SDO Total Suspended Solids (TSS) m L semi-annual Grab SDO H standard semi-annual Grab SDO Non -Polar Oil & Grease by EPA Method 1664 SGT-HEM mg/L semi-annual Grab SDO 40 CFR Part 423 Appendix A: Priority Pollutant Metals - Ag, As, Be, Cd, Cr, Cu, Hg, Ni, Pb, Sb, Se, Tl, Zn5 mg/L semi-annual Grab SDO Boron m L semi-annual Grab SDO Total Rainfa114 inches semi-annual I Rain Gauge - Footnotes: 1-4 Refer to Table 1, Footnotes 1-4. Monitoring for PCB may be discontinued after the first year if results are below detection. 5 Mercury shall be measured by EPA Method 1631E. Part II Page 8 of 17 Permit No. NCS000548 The following parameters shall be monitored during a measurable storm event from the area east of the Powerhouse designated as outfall SW008 and discharging to the Catawba River (Lake Norman). Table 5 Analvtical Monitoring ReauiremPntc fnr cwnnp Discharge Characteristics Units Measurement Fre uenc 1 Sample Type2 Sample Location3 Total Suspended Solids (TSS) m L semi-annual Grab SDO H standard semi-annual Grab SDO Total Rainfa114 inches semi-annual 7rRain Gauge - Footnotes: 1-4 Refer to Table 1, Footnotes 1-4 Stormwater outfall SWO08A is abandoned. As long as this outfall does not discharge, no analytical sampling is required. The following parameters shall be monitored during a measurable storm event from the Powerhouse roof, the precipitators 3 and 4 building roof and the trailer and laydown areas used during power outages designated as outfall SW009 and discharging to the Catawba River (Lake Norman) until this outfall is removed or no longer receives stormwater associated with industrial activity. Access to the discharge point in the intake canal can be difficult at times of high water. The permittee shall monitor the stormwater runoff from this subdrainage area prior to commingling with the ID fan non -contact cooling water flow. June 20, 2019: Drainage from this area has been redirected and discharges through NPDES wastewater Outfalls 003 or 005 (see Permit No. NC0004987). Table 6 Analvtical Monitoring Requirements for SW009 Discharge Characteristics Units Measurement Fre uenc 1 Sample Tvpe2 Sample Location3 PCBs1 µgel semi-annual Grab SDO Total Suspended Solids (TSS) m L semi-annual Grab SDO H standard semi-annual Grab SDO Total Rainfal14 inches semi-annual Rain Gauge - Footnotes: 1-4 Refer to Table 1, Footnotes 1-4. Monitoring for PCB may be discontinued after the first year if results are below detection. Stormwater flows from the contributing surface area shall be sampled prior to commingling with any other waters, including once -through cooling water. Part II Page 9 of 17 Permit No. NCS000548 Stormwater outfall SWO10 is abandoned. As long as this outfall does not discharge, no analytical sampling is required. The following parameters shall be monitored during a measurable storm event from the raw water storage tank area designated as outfall SWO11 and discharging to the Catawba River (Lake Norman). Table 7 Analytical Monitoring Requirements for mign l cwni Discharge Characteristics Units Measurement Fre uenc 1 V Sample Type2 Sample Location3 Total Suspended Solids m L semi-annual Grab SDO H standard semi-annual Grab SDO Cadmium, Total Recoverable m L semi-annual Grab SDO Chromium, Total Recoverable m L semi-annual Grab SDO Lead, Total Recoverable m L semi-annual Grab SDO Zinc, Total Recoverable m L semi-annual Grab SDO Total Rainfal14 inches semi-annual Rain au e - Footnotes: 1-4 Refer to Table 1, Footnotes 1-4 The following parameters shall be monitored during a measurable storm event from the gravel yard areas north and west of the FGD installation, designated as outfalls SWO12, SWO12A, and SW023, until this outfall is removed or no longer receives stormwater associated with industrial activity, and discharging to the Catawba River (Lake Norman). June 20, 2019: Drainage from this area has been redirected to a lined retention basin that discharges through NPDES wastewater Outfall OOS (see Permit No. NC0004987). Table 8 Analytical Monitoring Requirements for swni 7_ cwnI ?A Ind c1AM92 Discharge Characteristics Units Measurement Fre uenc 1 Sample Type2 Sample Location3 Total Suspended Solids (TSS) m L semi-annual Grab SDO H standard semi-annual Grab SDO Total Rainfal14 inches semi-annual Rain Gauge - Footnotes: 1-4 Refer to Table 1, Footnotes 1-4 Part II Page 10 of 17