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NCS000546_TIER STATUS CHANGE NOTIF_20200413S111( 2-- DUKE ' ENERGY Allen Steam Station 253 Plant Allen Rd. Belmont, NC 28012 704 829-2587 April 7, 2020 Mr. Zahid Khan �y N.C. Department of Environmental Quality �C Mooresville Regional Office �� 610 East Center Ave. Mooresville, NC 28115 :r Subject: NPDES Industrial Stormwater Tier Status °�s��0vel�FM Allen Steam Station Permit # NCS000546 Dear Mr. Khan: 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 III status at outfall SW018 for copper. Storm water samples for SW018 that exceeded copper benchmarks were collected on January 15, 2016, September 1, 2016, October 10, 2018 and March 3, 2020 (results received on March 24, 2020). This outfall is already in Tier III status for TSS. Duke Energy has a contract with a consultant to assist with resolutions. If you have any questions or comments regarding this information, please contact Mr. Robert Wylie (704) 562-8258 or Robert.Wylie@duke-energy.com. I 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. I am aware that there are significant penalties for submitting false information, including the possibility of fines and imprisonment for knowing violations. Sincerely, Terry Tuck General Manager II - Regulated Stations UPS tracking: 1Z X67 601 24 9811 9738