NC0038377_Daft Permit-Comments_20180307

� DUKE Mayo Steam Electric
ENERGY
10660 Boston Re
Roxboro NC,27574
March 7, 2018
Sergei Chernikov, PhD RECEIVE®/DENRJDWR
Division of Water Resources MAR
1617 Mail Service Center 4 Zo1�
Raleigh, NC 27699-1617 Water Res®urCes
Permitting Section
Subject Comments on DRAFT NPDES Permit for Mayo Steam Electric Plant
Permit No NC0038377
Person County
Dear Dr Chernikov
Duke Energy Progress, LLC (Duke Energy)submits the following comments on the draft NPDES Permit for
Mayo Steam Electric Plant These comments are in addition to all previous comments submitted by
Duke Energy and in addition to the meeting with Division staff on February 21, 2018 The following
comments and requests specifically summarize the February 21, 2018 meeting
The Division agreed to address all comments from the letter Comments on DRAFT NPDES Permit for
Mayo Steam Electric Plant dated February 21, 2017 with the exception of
• Mayo Creek will not be added to the list of receiving streams
o Thallium will not be removed from outfall 002
• Emergency Overflow will not be permitted for the FGD system
Duke Energy further requests the following
• Addition of an internal outfall to the domestic package plant Domestic wastewater limits have
been applied to this flow, and the plant understands that the domestic package plant will be
operated and maintained at all times to meet secondary treatment standards as specified by the
Division
• Removal of BOD and fecal sampling at outfall 002 with the inclusion of BOD and fecal sampling
at the new internal outfall associated with the domestic package plant
• Removal of the option to send monofill leachate to the new Lined Retention Basin (internal
outfall 11 can be removed) Monofill leachate will be processed via the thermal
evaporators Supplemental analytical data characterizing the leachate was submitted May 9,
2017 via email

- -- I2
• Addition of permit language to allow 12 months for the 0 24 ppb thallium limit to become
effective at outfall 002 This will allow sufficient time for a treatment system to be put in place
and become operational
• Removal of limits associated with footnote 8 (ELG's are currently remanded) at outfall 002
• Removal of language associated with discharge of chemical metal cleaning waste to the ash
pond, instead insert language for this flow to be discharged to the Lined Retention Basin
• Removal of Seep language for ww outfalls 004 and 005
• Removal of Attachment 1 & 2 and removal of Conditions A(23),A(31),A(33) and A(34)
Duke Energy welcomes any further discussion on these comments or the Draft Permit If you have any
questions, please contact Lori Tollie at 336 854 4916 or at Ion tollie@duke-energy corn.
Sincerely,
{ R
WIPP
Tom Copolo—Station Manager
Duke Energy
Cc. Mr John Hennessey—Mayo Public Hearing officer
1617 Mail Service Center
Raleigh, NC 27699-1617