NC0000396_Correspondence_20220209 (5)

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FedEx tracking: 775171340634
File: 12520B/ENV-30-32
November 10, 2021
Dr. Sergei Chernikov, PhD
North Carolina Department of Environmental Quality
Division of Water Resources
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: Asheville Steam Electric Generating Plant
NPDES Permit NC0000396
Request to modify NPDES permit
Dear Dr. Chernikov:
Keith Dauthit
Plant General Manager
Asheville Combined Cycle Station
Duke Energy Progress
ASVL PLT 146 Duke Energy Lane
Arden, NC 28704
o: 828-650-0620
t. 828-650-0701
ke ith. do u thi t @ duke -energy. com
The Asheville Steam Electric Generating Plant coal units retired in January of 2020,concurrent to the
natural gas combined cycle station completing commissioning. Decommissioning of the retired generation
units are well underway. Excavation of the 1964 ash basin is proceeding well and is projected to be
completed by the date required by the Mountain Energy Act.
The final basin closure processes will require additions to and physical modifications of outfall 101.
We do not anticipate the chemical characteristics of the typical releases from the modified outfall
101 to be different from the current discharge.
As part of the final excavation and closure of the 1964 ash basin, Duke Energy will be installing
underdrains to collect and direct groundwater within the footprint of the 1964 basin. A conceptual
drawing identifying the location and extent of the underdrain system and its outlet pathway to
outfall 101 is attached to the correspondence.
Further, post -excavation stormwater flows will naturally drain to and be a component of outfall 101.
These stormwater flows will consist of water from the former basin footprint and construction
stormwater during the forthcoming construction project. The facility will be required to "notch" the
1964 ash basin dam such that it will not impound water. Flow volumes will be attenuated as
required by local ordinance.
We are respectfully requesting the description of outfall 101 in our NPDES permit application to be
amended as follows:
"Following excavation of the 1964 ash basin,outfall 101 flows will consistofflows from
existing toe drains, groundwater removed via underdrains installed in the footprint of the 1964
ash basin and storm -water runoff."

Dr. Sergei Chernikov
NCDEQ Division of Water Resources
November 10, 2021
Duke Energy requests that the NPDES permit be modified to include this updated description of
outfall 101. A check in the amount of $1,030 is included for the modification fee. Should you
have questions or need additional information please contact Don Safrit at 919-546-6146.
Sincerely,
Keith Douthit
Asheville Plant Manager
Attachments:
A- Flow diagram
B - Conceptual post closure diagram
cc: Landon Davidson, DEQ, Asheville Regional Office - FedEx tracking 775171212080
Teresa Williams, Duke Energy
Cynthia Winston, Duke Energy
Don Safrit, Duke Energy
Shannon Langley, Duke Energy

Dr. Sergei Chernikov
NCDEQ Division of Water Resources
November 10, 2021
Asheville Steam Electric Generating Plant
NPDES Permit NC0000396
Attachment A — Flow Diagram

Post Coal plant shutdown and Ash basin closure Q3.2022
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Dr. Sergei Chernikov
NCDEQ Division of Water Resources
November 10, 2021
Asheville Steam Electric Generating Plant
NPDES Permit NC0000396
Attachment B — Conceptual Post Closure Diagram

Asheville Plant
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Date: 11/04/2021
Check #: 1000189637
Payment Amount: 1,030.00
Vendor #: 0000071949
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1. Use the 'Print' button on this page to print your label to your laser or inkjet printer.
2. Fold the printed page along the horizontal line.
3. Place label in shipping pouch and affix it to your shipment so that the barcode portion of the label can be read and scanned.
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Use of this system constitutes your agreement to the service conditions in the current FedEx Service Guide, available on fedex.com.FedEx will not
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