NC0001422_Electronic Reporting Requirements_20160219

fi(tisDUKEHarry K.Sideris
Senior Vice President
ENERGY® Environmental,Health&Safety
526 S. Church Street
Mail Code:EC3XP
Charlotte, NC 28202
[phone]
February 16, 2016
Mr. Jeffrey 0. Poupart
North Carolina Department of Environmental Quality—DWR
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
RECEIVED/
Subject: Duke Energy Progress, LLC. EQ/DWR
L. V. Sutton Energy Complex FEB 19 2016
NPDES Permit NC0001422 •
New Hanover CountyF Water Qualir;,
armm tinStactlotl
Dear Mr. Poupart:
Duke Energy Progress, LLC (Duke Energy)will soon commence removal of interstitial water from
the ash basins at the L.V. Sutton Energy Complex (Sutton). In order to meet the newly issued
NPDES permit requirements associated with the discharge of interstitial water from these
basins,the existing wastewater treatment process will be supplemented to include temporary,
mobile treatment units. These units will serve to provide additional treatment of the
interstitial water remaining in the basins. The purpose of this letter is to provide a courtesy
notification of the planned temporary changes and a simplified schematic of this additional
treatment process for your information and files.
As you are aware, and as described in Sutton's current NPDES Permit NC0001422, the existing
wastewater treatment system for waste flows from Sutton's former coal generating facility
consists of sedimentation and neutralization processes provided by the two site ash ponds.
That wastewater treatment system will be temporarily supplemented to include the following
treatment:
• Ballasted flocculation;
• Catalytic oxidation media filters;
• Coagulant, polymer, and additive feed systems;
• Ion exchange resin;
• Reverse osmosis system;
• Filter press trailers and sludge holding tanks
The treated effluent from the expanded wastewater treatment system will be routed to the
1984 ash pond diverter structure along the normal discharge path for final discharge to the

Cape Fear River through outfall 001. Any low volume wastes (such as reject streams or
backwash processes) resulting from this additional treatment will be recycled to various points
within the wastewater treatment system (temporary treatment units and/or the ash ponds).
Potential industrial stormwater from the area containing this equipment will be routed to the
ash pond in accordance with the NPDES permit and consistent with the handling of all other
industrial stormwater generated onsite. Sludge will be collected and properly disposed of
offsite. The vendor selected to provide these temporary units will be providing additional
operational support staff for the treatment equipment.
In accordance with NCGS 143-215.1(a6)1, and because all activity is authorized under the
facility's existing NPDES permit, no authorization to construct is required to be issued before
the temporary systems can be utilized, and no NPDES permit modification will be necessary.
Duke Energy remains committed to safely closing ash basins at all of our North Carolina sites.
We look forward to continuing to work with staff from your agency in a collaborative manner to
facilitate this work. If there are any questions, please feel free to contact LeToya Ogallo, EHS
CCP Permitting and Compliance, at LeToya.Ogallo@Duke-Energy .com or [phone].
Sincerely,
Harry Sideris, Senior Vice President
Environment, Health and Safety
Enclosures
cc:
Jim Gregson, Supervisor,Surface Water Protection Section, Wilmington Regional Office
Steve Reid, Supervisor, NC Operator Certification Program ,
Sergei Chernikov, Complex NPDES Permitting Unit
Jay Huntley, Sutton Station Manager
Kent Tyndall, Sutton Site Environmental Professional
LeToya Ogallo, EHS-CCP Permitting and Compliance
1 North Carolina General Statutes 143-215.1(a6)reads,"No permit shall be required to enter into a contract for the construction,
installation,or alteration of any treatment works or disposal system or to construct,install,or alter any treatment works or
disposal system within the State when the system's or work's principal function is to conduct, treat,equalize,neutralize,
stabilize,recycle,or dispose of industrial waste or sewage from an industrial facility and the discharge of the industrial waste or
sewage is authorized under a permit issued for the discharge of the industrial waste or sewage into the waters of the State."

Duke Energy Progress, LLC NPDES Permit NC0001422
L.V.Sutton Electric Plant Interstitial Wastewater Treatment Flow Chart
< 1971 (Old)
Outfall 002-not to be used Ash Pond
during dewatering Mobile Wastewater Treatment
Interstitial water
aJ 1984 Mobile" -
> Media
Clarifier >
fD (New) Ash filters
-J Pond - -
C Low volume wastes
o and storm water
4-1 Pathway not - V
D to be used Ion Reverse, •
during " Exchange- '< _ Osmosis - -
dewatering " Units Units "
V -
Ash pond _-
' discharge V_ _
Outfall 004-not to be used diverter Treated ash pond Filter'press ` - >- "
structure _Offsite - osal_
during dewatering effluent sludge 9 disposal
Outfall 001 to Cape Fear River