NC0024406_24406 Final Cover Major Mod 2021 signed_20210311

ROY COOPER
Governor
DIONNE DELLI-GATTI
Secretary
S. DANIEL SMITH
Director
NORTH CAROLINA
Environmental Quality
March 10, 2021
Mr. Paul Draovitch, Senior Vice President
Environmental, Health and Safety
Duke Energy Carolinas, LLC
Mail Code EC13K
P.O. Box 1006
Charlotte, North Carolina 28201-1006
Dear Mr. Draovitch:
Subject: Final NPDES Major
Modification
Permit NC0024406
Belews Steam Station
Stokes County
Facility Class I
The Division of Water Resources is forwarding herewith the Final Major Modification for Belews
Steam Station. 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 pH footnote for domestic wastewater discharge (Internal Outfall 009) was rewritten to
correct an error.
The Final Major Modification maintains the following significant changes contained
in the Draft Permit:
• The Technology Based Effluent Limits for Total Arsenic, Total Mercury, Total Selenium,
and Nitrate/nitrite as N have been updated to reflect the latest EPA changes to the Effluent
Guidelines per 40 CFR 423 (Internal Outfall 002).
• The TSS limits at Internal Outfall 009 have been increased from 30 mg/L to 90 mg/L
(Monthly Average) and from 45.0 mg/L to 135.0 mg/L (daily maximum) to reflect the fact
the facility is using a lagoon for treating domestic waste and these limits meet the
requirements of 15A NCAC 2B .406. In addition, monitoring for ammonia nitrogen, pH,
and temperature have been add to Internal Outfall 009 per 15A NCAC 2B .406.
NORTH DE
Department o/ Envlmnmentel Main
North Carolina Department of Environmental Quality j Division of Water Resources
512 North Salisbury Street 11617 Mail Service Center I Raleigh, North Carolina 27699-1617
919.707.9000

• Leachate flow has been added to the Lined Retention Basin (Outfall 006) to accommodate
treatment of future leachate flows from the CCR landfill that will be constructed at the site.
• Monitoring for Total Iron have been removed from Outfall 003 and Outfall 006a since all
the wastewater flows have been rerouted from the Ash Basin to the Lined Retention Basin.
• The bottom ash purge water was added to the list of the contributing sources of wastewater
to the Lined Retention Basin (Outfall 006). 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.
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].
Sincerely,
-DocuSigned by:
-8FB198649DD2478...
for S. Daniel Smith, Director
Division of Water Resources
cc: Central Files
NPDES Files
Winston-Salem Regional Office/Water Quality
WSS/Aquatic Toxicology Unit (e-copy)
EPA Region IV (e-copy)
NORTH DE
Department o/ Envlr,nmentel Main
North Carolina Department of Environmental Quality j Division of Water Resources
512 North Salisbury Street 11617 Mail Service Center I Raleigh, North Carolina 27699-1617
919.707.9000