NC0005088_Fact Sheet_20210618 (2)

DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES No. NC0005088
Facility Information
Applicant/Facility
Duke Energy Carolinas, LLC / Rogers Energy Complex
Applicant Address:
526 Church St., Charlotte, NC 28202
Facility Address:
573 Duke Power Road, Mooresboro, NC 28024
Permitted Flow (MGD):
Not limited
Type of Waste:
Industrial & domestic
Facility Classification:
I
Permit Status:
Major Modification
County:
Rutherford & Cleveland
Miscellaneous
Receiving Stream:
Broad River/UT to Broad
River (Outfall 106)
State Grid:
G11NE
Stream Classification:
WS-IV
USGS Quad:
Chesnee
Drainage Area (mi2):
849 - Broad River
Basin/Subbasin:
Broad/03-08-02
Summer 7Q10 (cfs)
287 Broad River
303(d) Listed?
No
Winter 7Q10 (cfs):
440 Broad River
HUC:
03050105
30Q2 (cfs)
635 Broad River
Regional Office:
Asheville
Average Flow (cfs):
1460 Broad River
Permit Writer:
Sergei Chernikov,
Ph.D.
IWC (%):
7.7 (002)
3.1 (005)
Date:
3/30/2020
SUMMARY
Duke Energy Carolinas operates the Rogers Energy Complex (REC); formerly known as Cliffside
Steam Station; a two -unit coal fired steam electric generating facility. Units 1-4 have been removed
from service. The station now operates only two units; Units 5 and 6. The total combined output is
1500 megawatts. Each unit has a Flue Gas Desulfurization (FGD) system. The site has an industrial
landfill for combustion byproducts where fly ash, bottom ash, gypsum and WWTP sludge is
deposited.
Water for cooling is withdrawn from the Broad River. Both units use cooling towers for heat
dissipation. Blowdown from Unit 5 is discharged to the ash basin. Blowdown from Unit 6 can be used
in the unit's make up water or discharged to the ash basin.
The receiving water is the Broad River, class WS-IV waters in the Broad River Basin. Previous
permits had this section classified as C. The correct classification is WS-IV and it will be modified in
the permit.
Fact Sheet
NPDES NC0005088 Renewal
Page 1

REC is subject to EPA effluent guideline limits per 40 CFR 423 - Steam Electric Power Generating
Point Source Category. The facility is also subject to the Cooling Water Intake Structures Rules (40
CFR 125) effective October 14, 2014 and to the North Carolina Senate Bill 729 - Coal Ash Management
Act.
This permit is being modified to make the following changes:
1). To adjust the Technology Based Effluent Limits for Total Arsenic, Total Mercury, Total Selenium,
and Nitrate/nitrite as N for Internal Outfall 004 (FGD wastewater) in accordance with updated 40
CFR 423.13(g)(1)(i). Please see the table below for details.
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
2). To extend compliance schedule for FGD wastewater from 12/31/2021 to 6/30/2022. This time is
needed to properly initiate biological treatment system and adjust physical/chemical equipment for
consistent performance. The request is based on the experience with the similar systems at Roxboro,
Marshall, and Allen facilities.
3). To reduce instream temperature monitoring frequency at Outfall 005 from Weekly to Quarterly.
Currently, the facility operates cooling towers on the remaining two power generating units. The
recent report demonstrated that the existing conditions defining the temperature mixing zone and
effluent temperature limits are being met. Furthermore, the facility is complying with the state
temperature standard and frequent instream monitoring is no longer necessary.
All the remaining terms and conditions of the permit remain unchanged.
PROPOSED SCHEDULE
Draft Permit to Public Notice:
Permit Scheduled to Issue:
February 23, 2021 (est.)
April 2, 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].
Fact Sheet
NPDES NC0005088 Renewal
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