NC0004987_Final Permit_20220411

ROY COOPER.
Governor
ELIZABETH S. BISER
Secretary
S. DANIEL SMITH
Director
NORTH CAROLINA
Environmental Quality
April 11, 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 Permit
Permit NC0004987
Marshall Steam Station
Catawba County
Facility Grade PC-II/WW-III
Dear Ms. Bednarcik:
The Division of Water Resources is forwarding herewith the Final Permit for Marshall Steam
Station. This permit 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 Permit contains the following significant changes from your Draft Permit:
• Limits for Total Arsenic have been re -instated in the permit based on the results of the
updated Reasonable Potential Analysis (Outfall 002).
The Final Permit maintains the following significant changes contained in the Draft
Permit:
• The Effluent Page for the decanting (Outfall 002) was removed from the permit since the
facility transitioned to the dewatering process.
• The monitoring frequency for the Total Copper, Total Selenium, Total Iron, and Total
Mercury was reduced from Weekly to Monthly based on the results of the Reasonable
Potential Analysis (Outfall 002).
• Limits for Total Copper have been converted from Water -Quality Based Limits to Technology
Based Limits based on the results of the Reasonable Potential Analysis (Outfall 005).
• The Instream Waste Concentrations for the Whole Effluent Toxicity Test was changed based
on the highest reported flow data (Outfall 002 and Outfall 005).
• Limits for Total Iron and Total Copper and Total Iron have been removed from Outfall 002
since ash basin no longer receives any wastewater.
NORTH 1:tE
nepertment of Environmental CAROLINA
ouat�
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

• The Outfall 003 status was changed from internal to external to reflect the current conditions
at the facility.
• The monitoring for the Total Cadmium, Total Chromium, Total Iron, Total Lead, Total
Nickel, Total Silver, and Total Zinc have been removed from the permit based on the results
of the Reasonable Potential Analysis (Outfall 005).
• The monitoring frequency for the Sulfates, Chloride, Bromide, TDS, and Total Hardness was
reduced from Monthly to Quarterly based on the results of the Reasonable Potential Analysis
and review of the effluent data (Outfall 005).
• The Chronic Toxicity monitoring frequency was reduced from Monthly to Quarterly to be
consistent with other major industrial permits (Outfall 005).
• The Section A. (19.) entitled Ash Settling Basin was removed from the permit since wastewater
is no longer discharged to the Ash Basin.
• The Section A. (20.) entitled Chemical Metal Cleaning Waste was removed from the permit
since wastewater is no longer discharged to the Ash Basin.
• The instream monitoring frequency was reduced from Monthly to Quarterly based on the
review of the instream data that demonstrated a lack of noticeable impact from the facility on
the receiving stream.
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
Mooresville Regional Office/Water Quality
WSS/Aquatic Toxicology Unit (e-copy)
EPA Region IV (e-copy)
NORTH
Department of Emb,nmentel Wally
Sincerely,
PotArtvAL
for Ricliarci t . t gers, Director
Division of Water Resources
DocuSigned by:
r
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