NC0086665_Fact Sheet_20220502

FACT SHEET
EXPEDITED - PERMIT RENEWAL
NPDES NC0086665
Basic Information for Expedited Permit Renewal
Permit Writer/Date
Sergei Chernikov, Ph.D. / 26 April 2022
Permit Number — County - Region
NC0086665 —Rockingham County - WSRO
Facility Name
Rockingham Combustion Turbine Station (Gas Fired)
Basin Name/Sub-basin number
Roanoke / 03-02-02
Receiving Stream
UT to Little Jacobs Creek [segment 22-32-2]
Stream Classification in Permit
C
Does permit need Daily Max NH3 limits?
No
Does permit need TRC limits/language?
No
Does permit have toxicity testing?
Yes
Does permit have Special Conditions?
No
Does permit have instream monitoring?
No
Is the stream impaired (on 303(d) list)?
No
Any obvious compliance concerns?
No
Any permit MODs since last permit?
No
Request for Renewal
October 10, 2021
Current expiration date
April 30, 2022
Comments:
COGEN classified "minor" industry
(see Renewal; Approach).
Facility Description. Rockingham Combustion Turbine Station dispatches backup and peaking power
in support of the regular Duke Energy system. The station consists of five (5) simple -cycle gas turbine
generators designed to produce about 180 megawatts each, for a total possible 900 MGW. Wastewater
treatment begins with an oil/water separator (OWS) followed by a coalescing filter (11,600-gallon
capacity). Principal fuel consumption includes natural gas and #2 diesel.
Renewal Approach. This facility is not coal-fired, but natural-gas fired with self-contained backup
storage of #2 diesel. In deference to Federal categorical 40 CFR 423, North Carolina has never
considered this facility a "major" industry, but permitted it as a "minor" industrial discharger. Treated
wastewater and stormwater drain to a single outfall (001) requiring compliance monitoring. No
changes recommended, except as follows.
When operating, the facility discharges a very low volume of water, typically less than 0.011 MGD.
Toxicity: The Permittee passed all annual Whole Effluent Toxicity (WET) tests since 2018, please see
attached.
Compliance: During this past permit cycle, this facility's database shows no violations, please see
attached.
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Renewal Summary:
1. updated Whole Effluent Toxicity special condition
2. updated eDMR text
Schedule to Issue:
Public Notice May 3, 2022
Approximate Issue Date . July 5, 2022
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