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Home My WebLink AboutNC0005363_Update to Permit Application_20170821+• 7 DUKE ENERGY® PROGRESS August 21, 2017 Certified Mail # 7015 1520 0001 8708 1547 (2 copies) Jeff Poupart NCDEQ 1617 Mall Service Center Raleigh, North Carolina 27699-1617 Subject: Duke Energy Progress, LLC Weatherspoon Plant Update to NPDES Permit Application- NC0005363 Dear Mr. Poupart, W H Weatherspoon Plant 491 Power Plant Rd Lumberton, NC 28358 Mailing Address L V Sutton Energy Complex 801 Sutton Steam Plant Rd Wilmington, NC 28401 o 910 341-4750 f 910 341-4790 RECEIVED/NMEWWR AUG 29 2017 Water Quality Permitting Section As a follow-up action identified as a result of Hurricane Matthew response activities, Duke Energy has identified the need to add an emergency spillway to the Weatherspoon cooling pond. This emergency spillway would add a second outlet to draw down the level of the cooling pond more quickly during extreme rainfall events, prevent overtopping and subsequent damage to the cooling pond dike, and ensure a controlled release of waters during all discharge scenarios The Weatherspoon plant operates a 225 acre cooling pond capable of discharging wastewater through outfall 001 to the Lumber River. The cooling pond is bordered by the Lumber River on the west and Jacobs Swamp on the east and southeast. The cooling pond rarely discharges: the last two discharge events were during Hurricane Matthew in 2016 and during Hurricane Floyd in 1999. In both cases floodwaters from Jacobs Swamp overtopped the cooling pond in several locations and the excessive inflow resulted in a discharge through outfall 001. Duke Energy proposes to construct an approximately 200 foot long emergency spillway adjacent to the existing 001 structure (coordinates 34034'57.95"N, 78°58'23.91 "W). Due to the spillway's location and purpose, Duke Energy would characterize this structure as an extension and emergency feature of outfall 001. Wastewaters discharged from outfall 001 would be representative of water discharged over the spillway and the receiving waterbody would remain the Lumber River. Duke Energy requests that the NPDES permit allow discharge through this emergency spillway during extreme rainfall events. Duke Energy would also request that wastewater samples continue to be collected at outfall 001 since the spillway would be inaccessible during a flood: the 001 structure would prevent access from the north and access from the south would likely be unsafe or unpassable to due flooding in Jacobs Swamp. A schematic of the cooling pond and proposed spillway location are included as an attachment to this correspondence. If there are any questions regarding the information provided in this letter, please contact Toya Ogallo, Environmental Specialist in our North Carolina Regional Headquarters at (919) 546-6647, or Kent Tyndall, Environmental Professional for the Weatherspoon Plant, at (910) 341-4775. These staff may also be reached via email at Letoya.Ogallo @ Duke -Energy corn or Kent.Tyndall @ Duke-Energy.com, respectively. Letter to Jeff Poupart Update to WSPN NPDES Permit Application August 21, 2017 Page 2 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 1 am aware that there are significant penalties for submitting false Information, including the possibility of fines and imprisonment for knowing violations Sincerely, Thomas A. Hanes Station Manager Cc via email: Truptl Desai, NCDEQ, Division of Water Resources Teresa Rodriguez, NCDEQ Division of Water Resources Attachment - Schematic of Weatherspoon Plant .ond. R b Ltib �: �' '• `� r' ,+" �;,"'�.�., '� +."V,. -.'`' _ ,,•j.,.. Gem Pudic BoatSubM Rodlo "k ToWe, nd pbnt jjj �• ' .... Y� P J� $ •w^t. �.il` -x' r,!,� ,r-•^'� .. -,. ,. "J � •yam � 1�� /' e • 'Y .. �; ° 1 --�+ inflow s _ 1 ater 1 Emergency --- int '1 flood W � ` .�••'" • Spillway location �'; .� b 1 1 d C -- 1 r0m Ja a SWCIrTIP "107 "� _ �:"� _. � `ti, r (� � ,S • Cem AW , . �. ., J► wMNF� � � � � f, I Y► 4- ern ch�•