NC0000396_Draft_20200415

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
S. DANIEL SMITH NORTH CAROLINA
Director Environmental Quality
February 3, 2020
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
Subject: Draft NPDES Major
Modification
Permit NC0000396
Asheville Steam Electric Plant
Buncombe County
Facility Class I
Dear Mr. Draovitch:
Enclosed with this letter is a copy of the draft Major Modification for your facility. Please review
the draft very carefully to ensure thorough understanding of the conditions and requirements it
contains.
The draft Major Modification contains the following significant changes from your current
permit:
• To accommodate changes required for conversion to Combined Cycle Plant, evaporator
system discharge was added to Outfall 002 and once -through cooling water for coal units was
removed.
• Measurement frequency for flow and temperature was reduced from Daily to Monthly due to
the significant flow reduction (Outfall 002).
• Monitoring for the Total Residual Chlorine and the Time of Chlorine Addition was removed
from Outfall 2 due to the cessation of Chlorine addition.
• Monitoring for Total Copper and Total Chromium were added to Outfall 002 based on the
review of the effluent data provided by the facility.
Please provide any comments you have regarding the draft permit to this office by March 3,
2020. At this time, the Division is also publishing a notice in the newspapers of general circulation
in Buncombe County, inviting public comment on the draft major modification. Following the 30-
day comment period, we will review all pertinent comments received and take appropriate action on
the permit modification.
DE Q�� North Carolina Department of Environmental Quality I Division of Water Resources
_ 512 North Salisbury Street 1 1617 Mail Service Center I Raleigh, North Carolina 27699-1617
NORTH CAROLINA
U'V' eMMElww1e 1Uual1 /`� 919.707.9000

The NPDES Standard Conditions (Parts II, III, and M are not included with this draft. They can
be found at the following link if you would like to review them in conjunction with this draft permit.
hags: / /bit.1y/2BZ4xxx
If you have any questions about the NPDES permit process, please contact me at the following e-
mail address: sergei.chernikov&ncdenr.gov, or telephone number: 919-707-3606.
Sincerely,
Sergei Chernikov, Ph.D.
Environmental Engineer III
Complex NPDES Permitting Unit
cc: NPDES Files
EPA Region IV (e-copy)
Asheville Regional Office / Surface Water Protection (e-copy)
Aquatic Toxicology Unit (e-copy)
TACU (e-copy)