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NCS000546_TIER STATUS CHANGE NOTIF_20210121DUKE ENERGY® January 20, 2021 Mr. Zahid Khan N.C. Department of Environmental Quality Mooresville Regional Office 610 East Center Ave. Suite 301 Mooresville, NC 28115 Subject: NPDES Industrial Stormwater Tier Status Change Allen Steam Station Permit # NCS000546 Gaston County Dear Mr. Khan: Allen Steam Station 253 Plant Allen Roao Belmont, NC28012 In accordance with the requirements of the Industrial Stormwater Permit NCS000546, please accept this letter as written notification that Allen Steam Station is in Tier 3 status at outfall SW020 for Zinc. Storm water samples for SW020 that exceed the Zn benchmark were collected on 6/15/16, 7/21/16, 9/1/16, and 12/14/20. The latest Stormwater analytical results were received 12/29/20. We are currently evaluating Best Management Practices (BMPs) to mitigate benchmark exceedances. If you have any questions or comments regarding this information, please contact Ms. Elizabeth Glenn (980) 373-0530 or Elizabeth.glennQduke-energy.com. 1 certify, under penalty of law, that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. 1 am aware that there are significant penalties for submitting false information, including the possibility of fines and imprisonment for knowing violations. cerelZ Rick Roperr General Manager III Allen Steam Station Fossil/Hydro Operations - Carolinas Coal Generation Page 2 Cc: Randy Gantt/Filenet - via email Elizabeth Glenn - via email UPS Tracking: 1 Z X67 601 42 9498 8899