NCS000575_Modification Request Letter for SW009-SW012_20200416

4DUKE
ENERGY,
PROGRESS
Sent via UPS
File 12520R
January 29, 2020
North Carolina Department of Environmental Quality
Attention: Annette Lucas
Division of Water Resources
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: Asheville Steam Electric Station
Industrial Storm Water Permit NCS00057S
Permit Modification Request
Dear Ms. Lucas:
Antonio D. Price, PE
Plant General Manager
Asheville Combined Cycle Station
Duke Energy Progress
ASYL PLT 146 Duke Energy Lane
Arden, NC 26704
o: 828-650.0620
t 828-650.0701
antonioprice @duke•energy.com
RECEIVED
C'B 6 4 2020
DENI?-LAND QUALITY
STC)RIOVVATER PERMITTING
Asheville Steam Electric Station requests the subject industrial storm water permit be modified in order to permit
four additional storm water outfalls. Two of these outfalls are associated with the operation of the Combined
Cycle. The other two outfalls are associated with a proposed industrial landfill for the disposal of coal ash.
Eight storm water outfalls were previously permitted under the subject permit for the Asheville Steam Electric
Station. Outfalls SW002, SW004, SW005 and SW006 were eliminated since the industrial activity for those outfalls
ceased. Outfalls SW007 and SW008 were planned but not installed. Therefore the outfalls being requested for
this permit modification are identified as SW009 through SW012.
Enclosed is the following:
1. A description of the outfalls that need to be permitted.
2. A aerial map showing the locations of these outfalls.
3. Two drawings that show the two areas to be permitted.
4. A check for $260.00 to cover the modifcation.
If you have questions or need additional information, please contact Robert Wylie at [phone].
1 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,
Antonio D. Price, PE, General Manager II
Asheville Steam Electric Station
Enclosures

Asheville Combined Cycle Station
Industrial Storm Water Permit Modification Request
January 2020
Introduction:
The Asheville Combined Cycle Station is finishing construction and soon to be turned over to
Duke Energy Progress for operation. The site's land disturbing activities are in the final stages
for stabilization. In addition to the combined cycle a new landfill is proposed for the site to go
into operation in early 2021 for the disposal of coal combustion residual (CCR). Construction of
this landfill is anticipated to begin in the first quarter of 2020. The following provides a
description of storm water activities and outfalls associated with the combined cycle and the
proposed landfill.
Asheville Combined Cycle:
Stormwater collected in the transformer containments are sent to the wastewater sump
through turbine bldg. drains tank then to OWS. The water treatment chemical unloading
containment drains directly to waste water sump and also has downspouts feeding the
containment from water treatment roof drains.
At the Asheville Combined Cycle Station the storm water within the power house (e.g. turbine
building drains, transformer containments, water treatment chemical unloading drains etc.)
gets collected and sent to a wastewater sump which discharges out an NPDES permitted outfall.
All exterior stormwater drains adjacent to the stations power house drains into two storm
water collection basins. These basins discharge into the same wetland area that the water
ultimately flows into the French Broad River. The outfalls leaving these basins are identified as
SW009 and SW010.
SW009 discharge is from the collection basin referred to as the East Storm Water Collection
Basin. This basin collects rainfall run-off from approximately 58 acres. Approximately 12 acres
is impervious.
SW010 discharge is from the collection basin referred to as the West Storm Water Collection
Basin. This basin collects rainfall run-off from approximately 31 acres. Approximately 25 acres
is impervious.
Asheville CCR Landfill:
Construction of a new landfill is scheduled to begin in the first quarter of 2020. This landfill is
being built for the disposal of ash from the 64-ash basin. The landfill is scheduled to go into
operation the first quarter of 2021 and is to be closed in 2023. The storm water that falls
directly on the landfill will be collected in chimney drains and processed as leachate which will
be discharged to the Metropolitan Sewage District of Buncombe County. Storm water that falls
Page 1 of 2

Asheville Combined Cycle Station
Industrial Storm Water Permit Modification Request
January 2020
on the landfill's access roads will flow into trenches that drain into storm water collection
basins. There are two storm water collection basins. These basins' outfalls are identified as
SWO11 and SW012. The basins discharge into an energy dissipater and then flows to the
French Broad River.
The drainage basin for SWO11 collects rainfall run-off from approximately 2.7 acres.
Approximately 1.6 acres is impervious.
The drainage basin for SWO12 collects rainfall run-off from approximately 5 acres.
Approximately 2.5 acres is impervious.
Page 2 of 2