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Home My WebLink AboutNC0003425_Interim date Compliance Submittal_20200211DUKE Duke Energy Progress, LLC ENERGY® Roxboro Stearn Electric Plant 1700 Dunnaway Road PROGRESS Semora, NC 27343 File: 12520 February 11, 2020 Mr. Danny Smith, Director North Carolina Division of Water Resources 1617 Mail Service Center Raleigh, NC 27699-1617 Subject: Duke Energy Progress, LLC. Roxboro Steam Electric Plant RECEIVED Special Order by Consent (SOC) FEB 1.8 2010 EMC SOC WQ S 18-005 Interim date compliance submittal KDEWWRINMES Dear Mr. Smith: In accordance with the NC Environmental Management Commission Special Order by Consent, EMC SOC WQ S 18-005, Duke Energy Progress, LLC. hereby submits this notification related to the completion of decanting of the ash basin in accordance with SOC condition 2.b.2. The subject SOC requires decanting completion by June 30, 2020. While no permit has been issued authorizing decanting as of the date of this letter, as discussed previously with Department staff, all wastewater inflows to the West Ash basin were ceased on April 10, 2019. This occurred with the redirection of plant wastewaters to the site's newly constructed Lined Retention Basin treatment system. Since that time, the level of water in the northern section of the ash basin (area north of the internal filter dike) has been reduced significantly. The water level in the basin has equalized across the north and south sides of the internal filter dike at approximately elevation 447' (see attached picture 1). Attached pictures 2 and 3 show the volume of water that has been removed from the ash basin through natural gravity outflow. Based on elevation changes, the basin has been lowered by approximately 90 million gallons of wastewater through the gravity drainage process. The elevation has been lowered approximately 13'. Due to the design of the basin, this is the total amount of water that can be decanted from the basin without allowing water to flow back through the internal filter dike from south to north. Therefore, as discussed with Department staff, decanting is complete. The area will continue to be maintained at this level and no mechanical removal of water will commence prior to NPDES permit receipt. This notice fulfills our reporting obligation found in section 2.) b. of the subject Order. f� DUKE ENERGY. PROGRESS Duke Energy Progress, LLC Roxboro Steam Electric Plant 1700 Dumuncay Road Semora, NC 27343 If you have any questions, please contact Mr. Shannon Langley at (919) 546-2439. 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 oil 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 imprisonnient for knowing violations. Sincerely, Tom Copolo — Plant Manager Roxboro Steam Electric Plant cc: Jeff Poupart NC Division of Water Resources 1617 Mail Service Center Raleigh, NC 27699-1617 Scott Vinson, Supervisor Raleigh Regional Office 3800 Barrett Drive Raleigh, NC 27608 (� DUKE ENERGY. PROGRESS bc: Robert Howard Lori Tollie/FileNet — via email Shannon Langley — via email Duke Energy Progress, LLC Roxboro Steam Electric Plant 1700 Dunnawav Road Semora, NC 27343 DUKE Duke Energy Progress, LLC ENERGY® Roxboro Steam Electric Plant 1700 Dunnaway Road PROGRESS Senora, NC 27343 Pictures of Roxboro ash basin NC0003425 SOC# WQS 18-05 February 2020 . Decanting completion submittal (' DUKE ENERGY® PROGRESS Picture 1 Water level across internal filter dike Operational level (2016 photo) j January 2020 level Duke Energy Progress, LLC Roxboro Steam Electric Plant 1700 Dunnaway Road Senora, NC 27343 '� >„ Via`. 1'�• �.,, ,,,�, ` �_ `�"' y � L •�� •µto it �\ DUKE ENERGY. PROGRESS Operational level (2016 photo) January 2020 Level (Gravity decanted) Duke Energy Progress, LLC Roxboro Steam Electric Plant 1700 Dunnaway Road Semora, NC 27343 Picture 2 Ash basin looking North rt L ,, Y ► ' �' DUKE ENERGY® PROGRESS Operational level (2016 photo) January 2020 level Picture 3 Ash basin looking South F .. VL�ISAII Duke Energy Progress, LLC Roxboro Steam Electric Plant 1700 Dunnaway Road Semora. NC 27343 F