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HomeMy WebLinkAboutNC0038377_SOC WQ S18-005_20190723 • (•s DUKE James Wells ENERGY; Vice President Environmental, Health and Safety Programs& Environmental Sciences 526 South Church Street Mail Code EC13K Charlotte, NC 28202 (980)373-9646 July 23, 2019 Via Overnight Mail Linda Culpepper Director of Water Resources North Carolina Department of Environmental Quality 1617 Mail Service Center Raleigh, NC 27699-1617 Bob Sledge Division of Water Resources North Carolina Department of Environmental Quality 1617 Mail Service Center Raleigh, NC 27699-1617 Subject: Report Under Special Order by Consent — EMC SOC WQ S 18-005 Duke Energy Progress, LLC — Mayo Steam Electric Plant NPDES Permit NC0038377 Dear Ms. Culpepper and Mr. Sledge: On behalf of Duke Energy Progress, LLC (DEP), I am submitting to you the Mayo Steam Electric Plant Progress Report summarizing the work and activities undertaken with respect to closure of coal ash surface impoundment as required by the Mayo Steam Electric Plant NPDES Permit NC0038377 Special Order by Consent (SOC), SOC No. S 18-005 Section 2.c.2). As required by the SOC, 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 fine and imprisonment for knowing violations. 4 Ms. Culpepper and Mr. Sledge July 23, 2019 Page 2 Please direct any questions concerning the Mayo Steam Electric Plant NPDES Permit NC0038377 SOC No. S 18-005 to Lori Tollie at (336) 854-4916. Sincerely, Jame Wells Vice resident, Environment, Health & Safety- Programs and Environmental Sciences Duke Energy CC: Richard Baker, Duke Energy Lori Tollie, Duke Energy Leanne Wilson, Duke Energy George Hamrick, Duke Energy Paul Draovitch, Duke Energy Matt Hanchey, Duke Energy Randy Hart, Duke Energy NPDES PERMIT NC0038377 SPECIAL ORDER BY CONSENT EMC SOC 518-005 QUARTERLY PROGRESS REPORT MAYO STEAM STATION J U LY 23, 2019 Background and Summary On August 15, 2018, Duke Energy Carolinas, LLC(DEC)and the North Carolina Environmental Management Commission entered into a Special Order by Consent — EMC SOC S18-005 (SOC) applicable to the Mayo Steam Station (Mayo). This report is submitted in accordance with Section 2.c.2) of the SOC. In compliance with Section 2.c.2), this report summarizes the work and activities undertaken with respect to decanting work and closure of coal ash surface impoundments at Mayo. The quarterly reports are due no later than the last day of January, April, July, and October for the duration of the SOC, once the decanting process has begun. The Mayo Steam Station is located in Roxboro, NC (Person County), on Mayo Lake. Mayo Lake is a man- made reservoir constructed by the impoundment of the Mayo Creek. The Mayo Steam Station is a single unit, 727-megawatt, coal-fired generating facility, which began commercial operation in 1983. Mayo's ash basin has a single impoundment, which is regulated by the North Carolina Department of Environmental Quality. The ash basin covers approximately 140 acres with a current ash inventory of approximately 6.6 million tons of ash as of April 30, 2019. Mayo historically wet sluiced coal combustion residual (CCR) products into a surface impoundment located on the property. This surface impoundment is known as the Ash Basin, which is impounded by the following dam: • Ash Basin (PERSO-035) The Ash Basin received CCR products from its initial operation in 1983 until 2019. Mayo ceased wet sluicing of bottom ash in May 2013 when the dry bottom ash system became operational. The Ash Basin was removed from service in June 2019 upon the completion of the diversion of all other wastewater flow to a newly lined retention basin. Decanting Status In compliance with this SOC, Duke Energy initiated design and procurement efforts in Q3 2018 for a decanting water treatment system at Mayo. Purchase Orders were awarded in January 2019 for the WWTS pad and electrical infrastructure installations, as well as a Purchase Order for the OEM water treatment supplier. Duke Energy commenced construction of the infrastructure and system in March 2019 and completed it in May 2019. Duke Energy provided advance notice for the projected start date of decanting to NCDEQ on June 20, 2019, as required by the NPDES Permit, and written notification for the initiation of decanting per the SOC on June 27, 2019. Through June 30, 2019, approximately 1 million gallons has been decanted at Mayo. Mayo: 1