NC0003425_Fact Sheet_20210625

DEPARTEMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES No. NC0003425
Facility Information
Applicant/Facility Name:
Duke Energy Progress/Roxboro Steam Electric Generating Plant
Applicant Address:
1700 Dunnaway Rd., Semora, NC 27343
Facility Address:
1700 Dunnaway Rd., Semora, NC 27343
Permitted Flow
Not limited
Type of Waste:
99.8 % Industrial, 0.2% - domestic
Facility/Permit Status:
Existing/Modification
County:
Person
Miscellaneous
Receiving Stream:
Hyco Reservoir
Stream Classification:
WS-V, B
Subbasin:
03-02-05
303(d) Listed?:
No
Drainage Area (mi2):
N/A
Primary SIC Code:
4911
Summer 7Q10 (cfs)
0
Regional Office:
RRO
30Q2 (cfs):
0
Quad
Olive Hill
Average Flow (cfs):
0
Permit Writer:
Sergei Chernikov, Ph.D.
IWC (%):
100%
Date:
02/18/2021
SUMMARY
The Roxboro Steam Electric Plant is an electric generating facility that uses steam turbine
generation via four coal-fired units with a with a combined electric generating output of 2558
MW: Unit No. 1 (385 MWe), Unit No. 2 (670 MWe), Unit No. 3 (707MWe) and Unit No. 4 (700
MWe).
This facility is subject to EPA effluent guideline limits per 40 CFR 423 - Steam Electric Power
Generating Point Source Category which were amended November 3, 2015. The facility is also
subject to the Cooling Water Intake Structures Rules (40 CFR 125) effective October 14, 2014. The
intake flow is > 125 MGD.
The facility has a long-term retirement schedule:
1,053 MW Roxboro Units 1-2 in December 2028
1,409 MW Roxboro Units 3-4 in December 2033
This permit is being modified to make the following changes:
1). Add the bottom ash purge to the list of the contributing sources of wastewater to the Lined
Retention Basin. Per updated 40 CFR 423.13(k)(2)(i)(A) (updated on 10/13/2020), the discharge
of pollutants in bottom ash transport water from a properly installed, operated, and
maintained bottom ash system is authorized to maintain system water chemistry where installed
equipment at the facility is unable to manage pH, corrosive substances, substances or conditions
causing scaling, or fine particulates to below levels which impact system operation or
maintenance.

NPDES PERMIT FACT SHEET Roxboro Steam Electric Plant
Page 2
NPDES No. NC00003425
2). Adjust the Technology Based Effluent Limits for Total Arsenic, Total Mercury, Total Selenium,
and Nitrate/nitrite as N for Internal Outfall 010 and Internal Outfall 011 (FGD wastewater) in
accordance with updated 40 CFR 423.13(g)(1)(i). Please see the table below for details.
Both changes are based on the October 13, 2020 update to the 40 CFR 423 (BAT).
Pollutant
Existing monthly average - daily
maximum limit
Modified monthly average - daily
maximum limit
Arsenic
8.0 µg/L -11.0 µg/L
8.0 µg/L -18.0 µg/L
Selenium
12.0 µg/L - 23.0 µg/L
29.0 µg/L - 70.0 µg/L
Mercury
356.0 µg/L - 788.0 µg/L
34.0 µg/L -103.0 µg/L
Nitrate/Nitrite
4.4 mg/L -17.0 mg/L
3.0 mg/L - 4.0 mg/L
3). Increase flow limit from 2.0 MGD to 3.0 MGD on the Internal Outfall 002 to accommodate
large storm events. In addition, the interstitial flow volume reporting was added to this outfall.
4). Correct header for the Condition A. (1) to allow for the complete ash excavation from East Ash
Basin Extension and for the discharge of industrial stormwater from the landfill.
5). Change the name of the monthly instream monitoring from 6B to F2 (Special Condition A.
(18)).
PROPOSED SCHEDULE
Draft Permit to Public Notice:
Permit Scheduled to Issue:
March 9, 2021 (est.)
April 26, 2021 (est.)
STATE CONTACT
If you have any questions on any of the above information or on the attached permit, please
contact Sergei Chernikov at [phone] or [e-mail].
CHANGES IN THE FINAL MODIFICATION
• The optimization requirement and the reopener clause were added for the FGD Effluent
Pages (Internal Outfall 010 and Internal Outfall 011) in response to the SELC comments.
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