NCS000580_Mayo FINAL PERMIT Cover Letter_20170127

Fnergy. i ineral &
Land Resources
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ROY COOPER
MICHAEL S_ REGAN
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TRACY DAVIS
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January 27, 2017
Paul Draovitch, Senior Vice President
526 S Church Street
Office 03233
Charlotte, NC 28202
Subject: NPDES Stormwater Permit Application
Mayo Steam Electric Plant
10660 Boston Road in Roxboro, NC
Permit Number NCS000580
Person County
Dear Mr. Draovitch:
In response to your application for coverage under NPDES stormwater permit NCS000580, the
Division of Energy, Mineral, and Land Resources (Division or DEMLR) is forwarding herewith the
subject state - 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).
This final permit includes the following changes from the draft permit posted on our website on
August 31, 2016:
Thank you for your comments submitted on October 31, 2016. Please see our responses below:
1. Duke Energy requested that permit reference Duke Energy Progress, LLC rather than Duke
Energy Progress, Inc. This change has been made in the final permit.
2. Duke Energy noted that outfalls 004, 005, 006c, 006d and 006e have been included in the
wastewater NPDES permit due to potential non-stormwater flows. Because these outfalls will
be covered as wastewater discharges they have been removed from the final stormwater
permit.
3. Duke Energy noted that outfall 006b does not have a point source discharge. Without a point
source, the area is not covered by the federal NPDES stormwater requirements. This outfall has
been removed from the final permit.
4. Duke Energy requested that the monitoring dates in the permit tables be updated to reflect the
effective date of the permit. Since the permits are issued for a five-year cycle, the dates have
been modified to be in line with the final effective date of the permits.
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NPDES NCS00580
January 27, 2017
Page 2
S. Duke Energy requested that copper monitoring be modified or removed because copper is a
commonly occurring ore mineral in the area. DEQ acknowledges that background soil
containing metals may influence discharge values enough to exceed established benchmark
values for metals like copper, zinc, and possibly others that are equally ubiquitous. The Tier
Responses in the permit allow DEQ flexibility to relieve monthly monitoring if the permittee
demonstrates circumstances are appropriate (discharge levels reflect natural background or
background influences beyond the permittee's control, for example) and/or all reasonable
stormwater pollution prevention measures have been attempted but cannot bring levels down.
In these instances, DEQ must also consider whether there are water quality problems in the
receiving waters resulting from these metals before making a decision on whether to grant the
permittee's request for reduced monitoring or to require additional efforts to reduce
concentrations. The permit already provides flexibility for the Duke Energy to work with our
staff on monitoring adjustments as additional information is gathered during permit
implementation.
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, Post Office Drawer 27447, Raleigh, North Carolina 27611-7447.
Unless such demand is made, this decision shall be final and binding.
Please take notice this permit is not transferable. Part III, B.2. addresses the requirements to be
followed in case of change in ownership or control of this discharge. This permit does not affect the
legal requirements to obtain other permits which may be required by the Division of Energy,
Mineral, and Land Resources, or permits required by the Division of Water Resources, Coastal Area
Management Act or any other federal or local governmental permit that may be required.
If you have any questions or comments concerning this permit, contact Mike Randall at (919) 807-
6374 or at [e-mail].
Sincerely
Original Signed by Tracy Davis
Tracy E. Davis, PE, CPM, Director
Division of Energy, Mineral, and Land Resources
cc: Raleigh Regional Office, DEMLR Land Quality Section
Tom Copolo - Mayo Station Manager
Sam Sampath, Ph.D., EPA Region IV, 61 Forsyth Street, Atlanta, GA 30303
Stormwater Permitting Program
Central Files