NCS000548_Modification Request for New Outfall SW026_20200709

COGS DUKE Marshall Steam Station
8320 East NC Hwy 150
E ENERGY, Terrell, NC 28682
828.478.7700
July 8, 2020
North Carolina Dept. of Environmental Quality
Attention: Annette Lucas
Division of Water Resources
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: Duke Energy Carolinas, LLC.
New Industrial Stormwater Outfall
Marshall Steam Station (NCS000548) - Catawba County
Dear Ms. Lucas:
Duke Energy plans to add a new industrial stormwater outfall (SW026) at Marshall
Steam Station in order to redirect approximately 200 acres of drainage area from
entering the ash basin. This new outfall is necessary to re-route stormwater away from
the ash basin and to assist in the closure of the ash basin. SW026 will discharge to a
cove of Lake Norman northeast of the ash basin. The stormwater will be re-routed by
clean closing portions of the ash basin and backfilling with soil to establish grades to
construct a stormwater diversion channel and lined stormwater pond. The diversion
channel will be partially grass lined and partially riprap lined. The stormwater pond will
be lined with a 40-mil linear low -density polyethylene geomembrane. The discharge
pipe will be a 48-inch diameter reinforced concrete pipe with a reinforced concrete
energy dissipator structure at the proposed outfall. Attached is a figure that shows the
drainage area for this outfall. It is requested that this outfall be included in stormwater
permit NCS000548 as it is currently being renewed.
If you have questions or need additional information, please contact Robert Wylie at
[phone].
Sincerely,
itr
General Manager III
Marshall Steam Station
cc: Bethany Georgoulias - Via Email
Zahid Khan - Via Email
Attachment: Figure of SW026 Drainage Area

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MAR-152 DRAINAGE AREA
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-———— ———— — -
REV. A
LEGEND
PROPOSED MAJOR TOPOGRAPHIC CONTOUR
PROPOSED MINOR TOPOGRAPHIC CONTOUR
PROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY (APPROXIMATE)
EXISTING SITE FEATURE BOUNDARY (APPROXIMATE)
DRAINAGE AREA BOUNDARY
PROPOSED MAR-152 STORMWATER DISCHARGE PIPE
NOTES_
1. DURING LANDFILL OPERATIONS, CONTACT WATER IN THE EXPOSED
CCR WORKING FACE IS CONTAINED AND CONVEYED TO THE
LEACHATE COLLECTION SYSTEM AND LINED RETENTION BASIN
(NPDES NC0004987) WHILE STORMWATER ON SOIL COVERED AND
VEGETATED SIDE SLOPES WILL BE CONVEYED TO THE PROPOSED
STORMWATER OUTFALL.
L=com
N MAR-152 DRAINAGE MAP
MARSHALL STEAM STATION
CLOSURE BY EXCAVATION CLOSURE PLAN
CATAWBA COUNTY, NORTH CAROLINA
FOR ISSUED FOR APPROVAL
SCALE: AS SHOWN
DUKE
DWG TYPE: .DWG
i
JOB NO: 60572849
N Enlk%fko.7** DATE : 06/17/2020
FILENAME: MAR-152 Drainage Map.dwg
0 500 1000 1500 DWG SIZE DRAWING NO.
ANSI D FIGURE 1
GRAPHIC SCALE (IN FEET) 22.0"x34.0"
7 8
DES: JW
DFTR: MW
CHKD: RJB
ENGR: RJB
APPD: JIB
REVISION
A
A--�
M