NC0003425_Correspondence_20210625 (3)

ROY COOPER.
Governor
JOHN NICHOLSON
Interim Secretory
S. DANIEL SMITH
Director
NORTH CAROLINA
Environmental Quality
June 25, 2021
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
Dear Ms. Bednarcik:
Subject: Final NPDES Major
Modification
Permit NC0003425
Roxboro Steam Electric
Generating Plant
Person County
Facility Class I
The Division of Water Resources is forwarding herewith the Final Major Modification for
Roxboro 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 the following significant changes from your Draft
Permit:
• The optimization requirement and the reopener clause were added for the FGD Effluent
Pages (Internal Outfall 010 and Internal Outfall 011) in response to the SELC comments.
The Final Major Modification maintains the following significant changes contained
in the Draft Permit:
1). The bottom ash purge water was added to the list of the contributing sources of wastewater to the
Lined Retention Basin. Per updated 40 CFR 423.13(k)(2)(i)(A) (updated on 10/13/2020), the
discharge of pollutants in bottom ash transport water from a properly installed, operated, and
maintained bottom ash system is authorized to maintain system water chemistry where installed
equipment at the facility is unable to manage pH, corrosive substances, substances or conditions
causing scaling, or fine particulates to below levels which impact system operation or maintenance.
NORTH 1:tE
nepertment of Environmental jolek"
CAROLINA
North Carolina Department of Environmental Quality Division of Water Resources
512 North Salisbury Street 11617 Mail Service Center I Raleigh, North Carolina 27699-1617
919.707.9000

2). The Technology Based Effluent Limits for Total Arsenic, Total Mercury, Total Selenium, and
Nitrate/nitrite as N were adjusted for Internal Outfall 010 and Internal Outfall 011 (FGD wastewater)
in accordance with updated 40 CFR 423.13(g)(1)(i).
3). The flow limit for the Internal Outfall 002 was increased from 2.0 MGD to 3.0 MGD to
accommodate large storm events. In addition, the interstitial flow volume reporting was added to this
outfall.
4). The header for the Condition A. (1) was corrected to allow for the complete ash excavation from
the East Ash Basin Extension and for the discharge of industrial stormwater from the landfill.
5). The monthly instream monitoring location name was changed from 6B to F2 (Special Condition
A. (18)).
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.
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
Raleigh Regional Office/Water Quality
WSS/Aquatic Toxicology Unit (e-copy)
EPA Region IV (e-copy)
NORTH D `E�
Department of &Mronme�l euellty�
Sincerely,
cDocuSigned by:
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itffrtAi eeupant
8FB19B649DD2478...
for S. Daniel Smith, Director
Division of Water Resources
North Carolina Department of Environmental Quality 1 Division of Water Resources
512 North Salisbury Street 11617 Mail Service Center I Raleigh, North Carolina 27699-1617
919.707.9000