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NCS000546_Tier response notification_20230321Young, Brianna A From: Glenn, Elizabeth <Elizabeth.Glenn@duke-energy.com> Sent: Tuesday, March 21, 2023 12:49 PM To: Khan, Zahid Cc: Georgoulias, Bethany; Young, Brianna A Subject: [External] Allen Steam Station NCS000546 - Tier 1 Notification CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to Report Spam. Mr. Khan — As directed by Part D., Section D-5 of the subject permit (NCS000546), notification is required to the Mooresville Regional Office of outfalls entering Tier 1 status. Results were received on 3/7/2023 for the sampling event for Stormwater on 2/17/2023. Tier One status for Total Suspended Solids, Mercury, Selenium, and Copper were triggered by a sample result noted in the table below. Parameter Benchmark SW010 SWO18 TSS 100 mg/L 180 mg/L 140 mg/L Cu 10 ug/L 20.5 ug/L Se Hg 5 ug/L 8.85 ug/L 14.5 ug/L 12 ug/L A stormwater management inspection was conducted on 3/16/23. Construction activities on site and truck traffic on nearby haul roads appear to be contributing factors. A cleanup of roadside ditches and refreshing of rock checks was performed on 3/27/23. Please let me know if you have any questions. Thank you, J. Elizabeth Glenn Permitting & Compliance Duke Energy, Environmental Services Office: (980) 373 0530 1