NC0003433_Outfall Relocation_20160621

(a DUKE Harry K.Sideris
ENERGY® Senior President ty
Environmental, Health
h&Safety
526 S. Church Street
Mail Code:EC3XF
Charlotte, NC 28202
[phone]
June 21, 2016
Mr. Jeffrey O. Poupart RECEIVED/NCDEQ/DVVR
North Carolina Department of Environment and Natural Resources
Division of Water Resources, Wastewater Branch JUN 2 3
1617 Mail Service Center 2016
Raleigh, NC 27699-1617 Water Quality
Pen-nitting Section
Subject: Duke Energy Progress, Inc.
Cape Fear Steam Electric Plant NPDES Permit NC0003433
NPDES Permit Application —Outfall Relocation
Dear Mr. Poupart:
Duke Energy Progress, Inc. (Duke Energy) hereby requests that Outfall 005 in the Cape Fear
Steam Electric Plant's NPDES permit be relocated from its current location to a location along
the discharge canal southeast of the existing Outfall 005. The relocation of this outfall is needed
to support both bulk and interstitial dewatering activities of the 1985 ash basin. In addition Duke
Energy also requests relief from the 1 foot per 7 days drawdown limit in the decant letter dated
17 December 2015.
In order to begin facilitating bulk dewatering of the 1985 ash basin into the discharge canal and
ultimately though Outfall 007, Duke Energy will need to install a waste water treatment system.
The wastewater treatment system is needed to comply with the provision in the decant letter
dated 17 December 2015, that states water quality standards in the receiving stream shall not
be contravened. In this scenario decanted bulk water will be pumped from the basin to a
treatment system approximately 2,000 feet southeast of the Outfall 005 outfall along the
discharge canal. The treated waste water would then be discharged into the effluent channel at
a location near the treatment unit ( see the attached photo). The relocation is needed because
of site constraints for the placement of the treatment unit.
Duke Energy received a COAR from NCDEQ's Dam Safety in May requiring a quick drawdown
of the 1985 basin if the level exceeds elevation 178.0' due to a storm event. The COAR
requires returning the water level in the basin to the approved Dam Safety level within a 15-day
period. This would require lowering the basin at a level of greater than 1-ft per 7 days as stated
in the decant letter dated 17 December 2015. By this letter Duke Energy is requesting relief
from the 1 foot per 7 days drawdown limit to comply with the Dam Safety COAR. This change
would be in alignment with the Sutton NPDES permit that states, "The drawdown rate shall not
exceed 1 foot/week to maintain the integrity of the dams, unless approved by the DEQ Dam
Safety Program"for both bulk dewatering and interstitial dewatering.

Mr. Jeffrey 0. Poupart
Cape Fear Steam Electric Plant NPDES Permit NC0003433
Page 2
If there are any questions regarding this report, Mr. Steve Cahoon via phone at [phone]
or via email at [e-mail].
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. I am aware that them are significant penalties for submitting false information,
including the possibility of fines and imprisonment for knowing violations.
Sincerely, r_
Harry K. Sideris
Senior Vice-President
Environmental, Health & Safety

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