NC0003425_Correspondence_20210625 (2)

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
S. DANIEL SMITH
Director
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:
NORTH CAROLINA
Environmental Quality
March 9, 2021
Subject: Draft NPDES Major Modification
Permit NC0003425
Roxboro Steam Electric Generating Plant
Person County
Facility Class I
The Division has received your request for a Major Modification of the subject permit.
Enclosed with this letter is the modified permit. Please review this permit modification carefully to
ensure thorough understanding of the conditions and requirements it contains.
The draft permit modification contains the following significant changes from your current
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.
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).
LD_E
NORTH CAROLINA
Department of Environmental Walk\ sjp1004...
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

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)).
Please provide any comments you have regarding the draft permit modification to this
office by April 12, 2021. At this time, the Division is also publishing a notice in the newspapers of
general circulation in Person County, inviting public comment on the Draft Modification. Following
the 30-day comment period, we will review all pertinent comments received and take appropriate action
on the permit modification.
If you have any questions about the NPDES permit process, please contact me at the
following e-mail address: [e-mail], or telephone number: 919-707-3606.
Sincerely,
Sergei Chernikov, Ph.D.
Environmental Engineer III
Industrial NPDES Permitting Unit
cc: Central Files
NPDES Files
EPA Region IV (e-copy)
Raleigh Regional Office/Water Quality (e-copy)
Raleigh Regional Office/PWS (e-copy)
WSS/Aquatic Toxicology Unit (e-copy)