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Home My WebLink AboutNCG120101_Special Renewal COC Issuance_20181106ROY COOPER Governor MICHAEL S. REGAN Secretary WILLIAM E. (TOBY) VINSON, JR. Interim Director Mr. Tom Copolo Station Manager Duke Energy Progress, LLC 10660 Boston Road Roxboro, NC 27574 Dear Mr. Copolo: NORTH CAROLINA Environmental Quality November 6, 2018 Subject: General Permit No. NCG120000 -Renewal Mayo Steam Plant Monofill COC No. NCG120101 Person County Please see the attached new Certificate of Coverage (COC) No. NCG120101 for renewed coverage under Stormwater General Permit NCG120000 for this facility. This permit is reissued pursuant to the requirements of North Carolina General Statute 143-215.1 and the Memorandum of Agreement between the state of North Carolina and the U.S. Environmental Protection Agency, dated October 15, 2007 (or as subsequently amended.) We received the company's request for clarification on this COC renewal on September 13, 2018. Renewed coverage under this General Permit is granted with the condition that the permittee performs additional sampling requirements as outlined in the amended conditions to the COC. These requirements are based on the material landfilled at this site. This COC requires you to sample each SDO semi-annually for arsenic, selenium, boron, conductivity, and pH. This COC also does not require fecal coliform monitoring. These monitoring parameters are based on the coal combustion residual material stored, and on monitoring results from 2014 and 2017 that were submitted with the request. Duke Energy indicated it would request a modification to NPDES Industrial Permit No. NCS000580 for Mayo Electric Generating Plant to include stormwater discharges from the Mayo Monofill. The Stormwater Program agrees a modification to that individual permit to include those discharges is preferable to continued coverage under this General Permit. Because General Permit NCG120000 expires on May 31, 2021—six months prior to the expiration of Mayo Plant's individual permit—our staff can coordinate a permit modification with the renewal of the individual permit. NORTH CAROUNAD I O�YO,ront a Fnrha,un W a� �{,� 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 919.707.9200 The permittee is required to apply for renewal no later than 180 days (six months) before the expiration of the Plant's individual permit NCS000580 (per Part III., Section B.): by July 1, 2021 in this case. Because that date occurs after the General Permit expires, we advise the company to request the modification and apply for renewal of NCS000580 by December 31, 2020. This date will give Program staff the opportunity to renew and issue the permit before the COC for the Monofill expires. The General Permit authorizes discharges of stormwater, and it specifies your obligations with respect to discharge controls, management, monitoring, and record keeping. Please review the new permit to familiarize yourself with all changes in the reissued permit. Your facility has six (6) months from receipt of the permit to update your Stormwater Pollution Prevention Plan (SPPP) to reflect any new permit requirements. Enclosed is a copy of the NCG120000 General Permit. When does electronic DMR (eDMR) reporting start, and does it affect this permit? Because this COC requires analytical monitoring, eDMR will affect you. We are working toward on - boarding permittees with NPDES stormwater permits into the DEQ's eDMR system next year. Permittees will receive notification when our eDMR system is ready for permit -holders to register and begin reporting monitoring data electronically. Your coverage under the General Permit is transferable only through the specific action of DEMLR. This permit does not affect the legal requirements to obtain other permits which may be required by the N.C. Department of Environmental Quality (DEQ), nor does it relieve the permittee from responsibility for compliance with any other applicable federal, state, or local law, rule, standard, ordinance, order, judgment, or decree. If you have any questions concerning this permit, please contact Bethany Georgoulias at telephone number (919) 707-3641 or by email bethany.geor og uliaskncdenr.gov. Sincerely, for William . (Toby) Vinson, Jr., P.E., CPM, Interim Director Division of Energy, Mineral, and Land Resources cc: Raleigh Regional Office/ Bill Denton Stormwater Program Files Lori Tollie / Duke Energy (via e-mail) DWR Central Files nio�ni ca.aa�r�aD � Q�� D.P.b M & bllk Mel UwNq� 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 919.707.9200 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENTAL QUALITY DIVISION OF ENERGY, MINERAL, AND LAND RESOURCES GENERAL PERMIT NO. NCG120000 CERTIFICATE OF COVERAGE No. NCG120101 STORMWATER DISCHARGES NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM In compliance with the provision 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, and the North Carolina Administrative Code in NCAC 15A 02H .0114(b)(1), as amended, Duke Energy Progress, Inc. is hereby authorized to discharge stormwater from a facility located at Mayo Steam Electric Plant Monofill 10660 Boston Road Roxboro Person County to receiving waters designated as Bowes Branch, a class C water in the Roanoke River Basin, in accordance with the effluent limitations, monitoring requirements, and other conditions set forth in Parts I, II, III, and IV of General Permit No. NCG120000 as attached, and as amended in pages 2-3 of this Certificate of Coverage. Amended conditions 1. This Certificate of Coverage is an enforceable part of the permit. 2. In accordance with 15A NCAC 02H .0114(b)(1), the monitoring program in Part II Section B Table 1 Analytical Monitoring Requirements of this permit is amended as follows: Table 1 Analvtical Monitoring Requirements Discharge Characteristics Units Measurement Frequencyl Sample Type2 Sample Location3 Chemical Oxygen Demand mg/1 semi-annual Grab SDO Fecal Coliform # per 100 ml not required N/A N/A Total Suspended Solids mg/1 semi-annual Grab SDO Arsenic As 5 mg/1 semi-annual Grab SDO Selenium (Se)5 mg/1 semi-annual Grab SDO Boron (13)5 mg/1 semi-annual Grab SDO H5 S.U. semi-annual Grab SDO Conductivity S m semi-annual Grab SDO Total Rainfa114 inches semi-annual Rain gauge Footnotes: 1 Measurement Frequency: Twice per year, during a measureable storm event. 2 Sample collection must begin within the first 30 minutes of discharge and continue to all outfalls until completed. 3 Sample Location: Samples shall be collected at each stormwater discharge outfall (SDO) unless representative outfall status (ROS) has been granted by NC Division of Energy, Mineral, and Land Resources (DEMLR). A copy of the DEMLR letter granting ROS must be kept on site. DEMLR's ROS letter remains in effect through the subsequent reissuance of this permit and as long as the pertinent site conditions and operations remain unchanged, unless the ROS letter provides for other conditions or duration. 4 For each sampled measureable storm event the total precipitation must be recorded from an on-site rain gauge. (Where isolated sites are unmanned for extended periods, a local rain gauge reading may be substituted for an on-site gauge, upon prior DEMLR written approval.) 5 No benchmark applies for these parameters. However, levels above 0.34 mg/l As, 0.056 mg/1 Se, or outside a pH range of 6.0-9.0 S.0 should be noted on the Stormwater Data Monitoring Report (SDMR) submitted to NC DEQ. This Certificate of Coverage shall become effective November 1, 2018. This Certificate of Coverage shall remain . effect for the duration of the General Permit. for William E. (Toby) Vinson, Jr., P.E., CPM Interim Director, Division of Energy, Mineral, and Land Resources By the Authority of the Environmental Management Commission 2 1 COC No. NCG120101 A effective November 1, 2018 LOCATION MAP: NCG12O1O1 Map Scale 1:24,000 Duke Energy Progress, Inc. Mayo Steam Electric Plant Monofill Latitude: 360 32'00" N Longitude: 780 55' 21" W County: Person Receiving Stream: Bowes Branch Stream Class: C Sub -basin: 03-02-05 (Roanoke River Basin) Facility Location