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Home My WebLink AboutNCS000546_Modified Permit with Cover Letter_20190307ROY COOPER Governor MICHAEL S. REGAN Secretary S. DANIEL SMITH Interim Director Mr. Terry W. Tuck General Manager II Allen Steam Station 253 Plant Allen Road Belmont, NC 28012 Dear Mr. Tuck: NORTH CAROLINA Environmental Quality March 7, 2019 Subject: NPDES Stormwater Permit Permit No. NCS000546 Minor Modification Allen Steam Station Gaston County The Division of Energy, Mineral, and Land Resources' Stormwater Program received your request to revise permit no. NCS000546 on November 21, 2018. 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: Modifications to the permit in Part II on pages 6-7 of 16, to include stormwater outfall SWO15 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. 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. D 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 08�hento1En °^mwuUua;\� 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.georgoulias(@ncdenr.gov. Sincerely, for S. Danie ith, 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 Elizabeth Glenn, Duke Energy (via email) Stormwater Program encl: Amended Permit Pages 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 Allen Steam Station 253 Plant Allen Road Belmont, NC Gaston County to receiving waters designated as Catawba River and South Fork River, a class WS-V, B 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. Amended August 14, 2015, June 20, 2016, December 29, 2016, and March 7, 2019, signed this 71h day of March 2019. Division of Energy, Mineral and Land Resources By the Authority of the Environmental Management Commission Permit No. NCS000546 SECTION B: ANALYTICAL MONITORING REQUIREMENTS Analytical monitoring of stormwater discharges shall be performed as specified in Tables 1-5. All analytical monitoring shall be performed during a measureable storm event at the specified-stormwater discharge outfalls (SDOs) that discharge stormwater associated with industrial activity (See Definitions). A measurable storm event is a storm event that results in an actual discharge from the permitted site outfall. The previous measurable storm event must have been at least 72 hours prior. The 72-hour storm interval does not apply if the permittee is able to document that a shorter interval is representative for local storm events during the sampling period, and the permittee obtains approval from the local DEMLR Regional Engineer. See Definitions. The parameters in Table 1 shall be monitored during a measurable storm event from Outfalls SW001 and SW001A (Drainage Area 1), Outfall SWO02 (Drainage Area 2), Outfall SWO03 (Drainage Area 3), Outfall SWO05 (Drainage Area 5), Outfall SWO07 (Drainage Area 7), Outfall SWO08 (Drainage Area 8), Outfall SWO09 (Drainage Area 9), and Outfall SW010 (Drainage Area 10), Outfall group SWO13 (Drainage Area 13 includes nine, SWO13-7 through SW013-15, 10" stormwater discharge outfalls along the rail line), Outfall SWO15 (Drainage Area 15), Outfall SWO16 (Drainage Area 16), Outfall SWO20 (Drainage Area 20) discharging to the Catawba River. • Outfalls SW001 and SW001A (Drainage Area 1) includes approximately 2,000 linear feet of rail lines and undeveloped wooded areas upland of the rail lines. • Outfall SWO02 (Drainage Area 2) includes approximately 1,000 linear feet of paved road and a 2.5 acre laydown area. • Outfall SWO03 (Drainage Area 3) includes approximately 1,500 linear feet of rail lines. • Outfall SWO05 (Drainage Area 5) is comprised of a gravel laydown yard and vegetated slopes located west and upland of the limestone unloading area. The gravel laydown yard comprises approximately 3 acres. The drainage area also includes approximately 500 linear feet of paved roadway. • Outfall SWO07 (Drainage Area 7) includes approximately 1,500 linear feet of rail lines, and 400 linear feet of gravel roadway and 400 linear feet of limestone conveyor. • Outfall SWO08 (Drainage Area 8) includes approximately 2,400 linear feet of rail lines, and 1000 linear feet of paved road and 400 linear feet of limestone conveyor. • Outfall SWO09 (Drainage Area 9) includes approximately 940 linear feet of rail lines. • Outfall SWO10 (Drainage Area 10) includes approximately 1,280 linear feet of rail lines. • Outfall Group SWO13 (Drainage Area 13) includes nine 10" stormwater discharge outfalls along approximately 1700 linear feet of rail lines and gravel road. • Outfall SWO15 (Drainage Area 15) includes a large soil borrow area, two ash structure fill areas, and approximately a one -mile gravel and dirt road. • Outfall SWO16 (Drainage Area 16) includes approximately 1,700 linear feet of paved access road, 1,000 linear feet of a paved ash haul road, 700 linear feet of paved road south of the access road, 1,000 linear feet of dirt roads and a gravel laydown and equipment parking area north of the access road. Part II Page 6 of 16 Permit No. NCS000546 Outfall SW020 (Drainage Area 20) includes approximately 1,300 linear feet of paved access road, and an earth spoil area and a gravel construction parking area and storage area. Table 1. Analytical Monitoring Requirements for Outfalls SWO01 and SWO01A, SWO02, SWO03, SWO05, SWO07, SWOOB, SWO09, SWO10, Outfall Group SWO131, SWO15, SWO16, and SW020 discharging to the Catawba River Discharge Measurement Sample Sample Characteristics Units Frequencyl Type2 Location3 Total Suspended Solids (TSS) semi-annual (quarterly, during Grab SDO mg/L coal or ash transport only) Total Rainfal14 semi-annual (quarterly, during Rain inches coal or ash - transport only)Gauge 40 CFR Part 423 Appendix A: quarterly, during Priority Pollutant Metals - Ag, As, Be, mg/L coal or ash Grab SDO Cd, Cr, Cu, Hg, Ni, Pb, Sb, Se, Tl, Zn 5 transport only BoronS quarterly, during mg/L coal or ash Grab SDO transport only pH5 quarterly, during standard coal or ash Grab SDO transport only Footnotes: 1 Measurement Frequency: Twice per year (unless other provisions of this permit prompt monthly sampling) during a measureable storm event, until either another permit is issued for this facility or until this permit is revoked or rescinded. If the facility is monitoring monthly because of Tier Two or Three response actions under the previous permit, the facility shall continue a monthly monitoring and reporting schedule in Tier Two or Tier Three status until relieved by the provisions of this permit or the Division. 2 Grab samples shall be collected within the first 30 minutes of discharge. When physical separation between outfalls prevents collecting all samples within the first 30 minutes, sampling shall begin within the first 30 minutes, and shall continue until completed. 3 Sample Location: Samples shall be collected at each stormwater discharge outfall (SDO) specified above unless representative outfall status (ROS) has been granted. The permittee may petition the Director for ROS using DEMLR's ROS Request Form. DEMLR may grant ROS if stormwater discharges from a single outfall are representative of discharges from multiple outfalls. Approved ROS will reduce the number of outfalls where the analytical sampling requirements apply and will be documented in a letter to the permittee. A copy of the Division's letter granting ROS shall be kept on site. 4 For each sampled measureable storm event, the total precipitation must be recorded. An on -site rain gauge is required. Where isolated sites are unmanned for extended periods of time, a local rain gauge reading may be substituted for an on -site reading. 1 Outfall Group 13 (Drainage Area 13) includes nine 10" stormwater discharge outfalls along the rail line. Part II Page 7 of 16