NC0000396_Correspondence_20220209

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
S. DANIEL SMITH
Director
NORTH CAROLINA
Environmental Quality
February 3, 2022
Ms. Jessica Bednarcik, Senior Vice President
Environmental, Health and Safety
Duke Energy Carolinas, LLC
Mail Code EC13K
P.O. Box 1006
Charlotte, North Carolina 28201-1006
Subject: Final NPDES Major
Modification
Permit NC0000396
Asheville Steam Electric Generating Plant
Buncombe County
Facility Class I
Dear Ms. Bednarcik:
The Division of Water Resources is forwarding herewith the Final Major Modification for Mayo
Steam Electric Generating Plant. This modification is issued pursuant to the requirements of
North Carolina General Statute 143-215.1 and the Memorandum of Agreement between North
Carolina and the U.S. Environmental Protection Agency dated October 15, 2007 (or as
subsequently amended).
The Final Major Modification contains no significant changes from your Draft Major
Modification.
The Final Major Modification maintains the following significant changes contained
in the Draft Major Modification:
• The description of Outfall 101 was amended as follows: Following excavation of the 1964 ash
basin, Outfall 101 flows will consist of flows from existing toe drains, groundwater removed via
underdrains installed in the footprint of the 1964 ash basin and storm water runoff.
If any parts, measurement frequencies, or sampling requirements contained in this permit are
unacceptable to you, you have the right to an adjudicatory hearing upon written request within thirty
(30) days following receipt of this letter. This request must be in the form of a written petition,
conforming to Chapter 150B of the North Carolina General Statutes, and filed with the office of
Administrative Hearings, 6714 Mail Service Center, Raleigh, North Carolina 27699-6714. Unless such
a demand is made, this permit shall be final and binding.
�D_E
NORTH CAROLINA
Department of Environmental Quality
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11617 Mail Service Center I Raleigh, North Carolina 27699-1617
919.707.9000

Please note that this permit is not transferable except after notice to the Division. The Division may
require modification or revocation and reissuance of the permit. This permit does not affect the legal
requirements to obtain other permits which may be required by the Division of Water Resources or
any other Federal, State, or Local governmental regulations.
If you have any questions or need additional information, please contact Sergei Chernikov, telephone
number [phone] or email- [e-mail].
cc: Central Files
NPDES Files
Asheville Regional Office/Water Quality
WSS/Aquatic Toxicology Unit (e-copy)
EPA Region IV (e-copy)
G=D_E
NORTH CAROIJNA
Department al Environmental Quality
Sincerely,
S. Daniel Smith, Director
Division of Water Resources
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11617 Mail Service Center I Raleigh, North Carolina 27699-1617
919.707.9000