NC0003425_Correspondence_20200529

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
S. DANIEL SMITH
Director
NORTH CAROLINA
Environmental Quality
May 29, 2020
Mr. Paul Draovitch, Senior Vice President EH&S
Duke Energy Carolinas, LLC
Mail Code: EC13K
P.O. Box 1006
Charlotte, NC 28201-1006
Subject:
Dear Mr. Draovitch:
Final NPDES Permit Renewal
Permit NC0003425
Roxboro Steam Electric Plant
Person County
Facility Class II
Division personnel have reviewed and approved your application for renewal of the subject permit.
Accordingly, we are forwarding the attached NPDES permit. 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 Division made the following additional changes to the Draft Permit:
• Monitoring for Fecal Coliforms and BOD were eliminated from Outfall 012B and Outfall 012C
to correct an error, these parameters are monitored at Outfall 008 (domestic package plant).
The final permit maintains the following significant changes identified in the letter sent on January
22, 2020:
• The special condition addressing the discharge from seepage was eliminated. Seeps will be
addresses through Special Order by Consent EMC SOC WQ S 18-005.
• Outfall 001 discharge location and monitoring requirements were modified. This outfall is
described as the discharge of the East Ash Basin Extension and stormwater runoff. The outfall
location was established at the UT to Hyco Lake. The monitoring frequency during the removal of
the ash from the east ash basin extension was modified to weekly.
• The RPA for outfall 003 was revised using updated thallium criteria, as a result the limits for
thallium were eliminated.
• For clarification, the identification of outfall 003 was modified to heated water discharge pond.
• Monitoring frequency for arsenic, selenium and mercury at outfall 003 was increased to weekly
during dewatering.
• The note for outfall 002 that contains the requirement to use physical -chemical treatment during
decanting and dewatering was modified. The installation of physical/chemical treatment is not
required unless necessary to meet the water quality standards.
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• The groundwater monitoring well construction and sampling condition was eliminated from the
permit.
• pH limits were eliminated from internal outfalls.
• The flow page for 0.15 MGD for the domestic treatment system (outfall 008) was eliminated
since the WWTP was upgraded to 0.25 MGD.
• Monitoring for arsenic, mercury, antimony, copper, molybdenum and selenium were added to
Outfall 012A due to the contribution from ash basin closure flows and treated groundwater.
• Outfall 006 requirements were modified to reflect the nature of the discharge. This pond
discharge is episodic, it only discharges if there is a heavy rain event, therefore limits were
implemented as daily maximums.
• Special Condition A. (28) Compliance Boundary was added to the permit. Groundwater
compliance boundary maps were added to the permit as Attachments A and B. Attachment A
describes the current compliance boundary and Attachment B describes the compliance boundary
once the ash is removed from the East Ash Basin Extension.
• Special condition for instream sampling was modified to require monthly sampling, to add
sulfides to the list of monitored parameters and to specify a sampling location.
• The Fish Tissue Monitoring Near Ash Pond special conditions was modified to clarify
requirements.
• The special condition for 316(b) requirements was modified to include a schedule to submit the
information by May 31, 2022.
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 demand is made, this decision 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 concerning this permit, please contact Sergei Chernikov at [phone] or via
email at [e-mail].
Sincerely,
S. Daniel Smith, Director
Division of Water Resources, NCDEQ
Hardcopy: NPDES Files
Central Files
Raleigh Regional Office/Water Quality
E-copy: US EPA Region IV
DWR/Aquatic Toxicology Branch