NC0001422_Correspondence (Permit Mod)_20200616

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
June 12, 2020
Subject: Permit Major Modification
Permit NC0001422
L.V. Sutton Energy Complex
New Hanover County
Facility Class I
We have received your request for a Major Modification of the subject facility. The request has been
granted.
Enclosed with this letter is modified permit. Please replace the existing permit with the modified
permit.
The permit modification contains the following significant changes from your current
permit:
• Copper and Nickel Compliance Schedule for Outfall 001/004 was eliminated. The facility
submitted a CORMIX model and limits for Copper (limit was eliminated), Nickel, Arsenic, and
Selenium were recalculated.
• Special conditions for continuous pH and TSS monitoring were removed from the permit since
the facility completed excavation of the ash.
• Copper compliance schedule for Outfall 008 was extended by 2 years to allow the facility to
conduct a Water Effect Ratio study.
• Wastewater from the Lay of the Land Ares (LOLA) was added to Outfall 001 to facility
excavation of coal ash from LOLA.
• Whole Effluent Toxicity monitoring frequency was reduced to Quarterly from Monthly due to
the completion of the coal ash excavation.
• Internal Outfalls 005, 006, 007, and 009 were removed from the permit since all the wastewater
from these Outfalls is monitored at Outfall 008.
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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

• Outfalls 002 and 004 were removed from the permit since both ash ponds have been completely
excavated.
• Limit for Copper (Outfall 001) was removed from the permit based on the results of the
Reasonable Potential Analysis that considered a new dilution derived from the CORMIX model.
• Limits for Arsenic, Selenium, and Nickel (Outfall 001) have been recalculated based on the
results of the Reasonable Potential Analysis that considered a new dilution derived from the
CORMIX model.
• Acute toxicity testing requirements have been changed to Chronic Quarterly testing
requirements at 22% based on the CORMIX model.
No other changes have been made. This permit 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.
Please take notice that this permit is not transferable. Part II, E.4. addresses the requirements to be
followed in case of change in ownership or control of this discharge.
If you have any questions or need additional information, please contact Sergei Chernikov, telephone
number [phone] or email: [e-mail].
Sincerely,
S. Daniel Smith, Director
Division of Water Resources
cc: Central Files
NPDES Files
Wilmington Regional Office/Water Quality
WSS/Aquatic Toxicology Unit (e-copy)
EPA Region IV (e-copy)