NC0038377_Comments_20180604

DUKE Mayo Steam Electric
10660 Boston Ro
ENERGY® Roxboro NC,27574
June 4, 2018
Sergei Chernikov, PhD.
Division of Water Resources
1617 Mail Service Center
Raleigh, NC 27699-1617
RECE9VED/DENRIDWR
Subject: Comments on the DRAFT NPDES Permit for Mayo Steam Electric Plant
Permit No.: NC0038377 JUN 11 2018
Person County Water Resources
Permitting Section
Dear Dr. Chernikov:
Duke Energy Progress, LLC (Duke Energy) submits the following comments on the draft NPDES Permit
currently at public notice. 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. Duke Energy further
requests the following:
• The removal of weekly monitoring for BOD,TSS, and fecal coliform at new internal outfall 011
for the domestic package plant. Duke Energy realizes that more frequent monitoring is
appropriate during the first year as this is a new internal outfall, but feels that weekly
monitoring is not warranted.The total flow from the domestic package plant is 12,000 gpd that
comingles with the discharge from the lined retention basin. Duke Energy proposes quarterly
monitoring for the first year,transitioning to annual which is consistent with the Roxboro NPDES
permit.
• The removal of daily temperature monitoring at lined retention basin's internal outfall 002A.
Daily temperature monitoring is required at outfall 002.
• The removal of language in the fact sheet"cooling tower blowdown is usually mixed with ash
sluice water prior to discharge to the ash pond" as no ash sluice water is discharged at outfall
008.
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 [e-mail].
Sincerely,jvCal2tr—
Tom
Copolo—Station Manager
Duke Energy