NC0086665_Renewal (Application)_20161017

(� DUKE
ENERGY
October 14, 2016
Mr. Tom Belnick, Supervisor
NPDES Complex Permitting
NC DEQ/DWR/WQ Permitting Section
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: Rockingham Combustion Turbine (CT) Station
National Pollutant Discharge Elimination System
NPDES Permit No. NC0086665
Renewal Application
Dear Mr. Belnick:
Rockingham CT Station
240 Earnest Drive
Reidsville, NC 27320
C Bll l �;t,a/1,
OCT 17 2o16
'vi/ater Qtjalif
Permitting SPctr®r,
The current NPDES permit for the Rockingham CT Station expires on April 30, 2017. Duke
Energy Carolinas, LLC hereby requests that the NPDES permit for the facility be reissued.
Enclosed for your consideration and review is NPDES Permit Application Short Form C - Minor
Industrial, in triplicate.
With reissuance of the NPDES permit, Duke Energy Carolina, LLC requests the following:
Removal of Monitoring for Benzene, Toluene, Ethylbenzene and Xylene (BTEX) - Outfall
001
Duke Energy Carolinas, LLC respectfully requests benzene, toluene, ethylbenzene and xylene
(BTEX) be removed from the monitoring requirements associated with Outfall 001. A similar
request had been made during the previous NPDES renewal application process but the
request was not honored due to an insufficient data size (n=7). Following the effective date of
the previous permit (August 1, 2012), Duke Energy Carolinas, LLC proceeded to collect and
analyze additional Outfall 001 effluent BTEX samples. Since October 2012, we have collected
and analyzed twenty-one (21) sets of BTEX samples. Table 1 summarizes the BTEX results.
Table 1 - Rockingham Outfall 1 BTEX Analytical Results
Date
Benzene (ug/1)
Toluene (ug/1)
Ethylbenzene (ug/1)
Xylene (ug/1)
October 2012
<1.0
<1.0
<1.0
3.20
November 2012
<1.0
<1.0
<1.0
2.61
December 2012
<1.0
<1.0
<1.0
1.92
January 2013
<1.0
<1.0
<1.0
<1.0
February 2013
<1.0
<1.0
<1.0
3.68
March 2013
<1.0
<1.0
<1.0
<1.0
April 2013
<1.0
<1.0
<1.0
<1.0
May 2013
<1.0
<1.0
<1.0
<1.0

NC DEQ/DWR/WQ Permitting Section
Page 2 of 2
Table 1 - Rockingham Outfall 1 BTEX Analytical Results (continued)
Date
Benzene (u /1)
Toluene (ug/1)
Eth (benzene (u/I)
Xylene (ug/11)
June 2013
<1.0
<1.0
<1.0
<1.0
July 2013
<1.0
<1.0
<1.0
2.4
August 2013
<1.0
<1.0
<1.0
<1.0
September 2013
<1.0
<1.0
<1.0
<1.0
October 2013
<1.0
<1.0
<1.0
<1.0
November 2013
<1.0
<1.0
<1.0
<1.0
December 2013
<1.0
<1.0
<1.0
<1.0
January 2014
<1.0
<1.0
<1.0
<1.0
July 2014
<1.0
<1.0
<1.0
<1.0
January 2015
<1.0
<1.0
<1.0
<1.0
July 2015
<1.0
<1.0
<1.0
<1.0
August 2015
<1.0
<1.0
<1.0
<1.0
January 2016
<1.0
<1.0
<1.0
<1.0
Maximum Value <1.0 <1.0 <1.0 3.68
Minimum Value <1.0 <1.0 <1.0 <1.0
Average <1.0 <1.0 <1.0 0.60*
Note: *values less than one ugA (<1.0) are considered as zero (0) for calculation of average.
If you have any questions regarding the enclosed information, please contact Mr. Don Safrit,
P.E., at [phone] or Ms. Dana Newcomb at [phone].
I certify, under penalty of law, that this document and all attachments were prepared under my
direction or supervision in accordance with a system designed to assure that qualified
personnel properly gather and evaluate the information submitted. Based on my inquiry of the
person or persons who manage the system, or those persons directly responsible for
gathering the information, the information submitted is, to the best of my knowledge and
belief, true, accurate, and complete. I am aware that there are significant penalties for
submitting false information, including the possibility of fines and imprisonment for knowing
violations.
Sincerely,
5 ez
Lawrence D. Sparks
Dan River CC/Rockingham CT General Manager
Enclosures:
NPDES Permit Application - Short Form C - Minor Industrial
Rockingham Combustion Turbine Water Schematic Diagram
Figure 1 - Rockingham CT Station Discharge Location Map
cc: Ms. Dana Newcomb
Mr. Don Safrit
NC DEQ DWR WSRO

1 NPDES PERMIT APPLICATION - SHORT FORM C - Minor Industrial
Minor industrial, manufacturing and commercial facilities.
Mail the complete application to:
N. C. Department of Environment and Natural Resources
Division of Water Quality / NPDES Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
1. Contact Information:
Owner Name
Facility Name
Mailing Address
City
State / Zip Code
Telephone Number
Fax Number
e-mail Address
NPDES Permit Number INCO086665
Please print or type.
Duke Energy Carolinas, LLC
Rockingham Combustion Turbine Station
240 Earnest Drive
Reidsville
North Carolina 27320
[phone]
[phone]
Lawrence. [e-mail]
2. Location of facility producing discharge:
Check here if same as above
Street Address or State Road
City
State / Zip Code
County
3. Operator Information:
Name of the firm, consultant or other entity that operates the facility. (Note that this is not referring to
the Operator in Responsible Charge or ORC)
Name Duke Energy Carolinas, LLC
Mailing Address 526 South Church Street, EC13K
City
State / Zip Code
Telephone Number
Fax Number
4. Ownership Status:
Federal ❑
Charlotte
North Carolina 28201
[phone]
[phone]
State ❑ Private ® Public ❑
Page 1 of 5 C -MI 10/08

NPDES PERMIT APPLICATION - SHORT FORM C - Minor Industrial
Minor industrial, manufacturing and commercial facilities.
5. Standard Industrial Classification (SIC) code(s): 4911
6. Number of employees: 11
7. Describe the treatment system List all installed waste treatment components with capacities,
describe the processes that generate wastewaters. If the space provided is not sufficient attach a
separate sheet of paper with the system description.
The wastewater system is primarily for the treatment of storm water, process water,
system blow downs, wash downs, air conditioning condensate and other discharges
associated with the operation of the gas turbines. The treatment system is designed to
remove oil/fuel from the wastewater. The treatment system consists of an oil water
separator (OWS) with a coalescing filter that functions as a polishing filter. Wastewater
is collected in the OWS sump passes through the OWS and then is pumped through
one of two polishing filter before discharge to the 001 outfall.
The OWS and coalescing filter have a capacity of 11,600 gallons. The discharees are
primarily influenced by precipitation and plant operations which can vary greatly
seasonally. Design, average, and maximum instantaneous discharge flow rates from the
OWS and 001 outfall range between 100 and 500 gpm respectively depending on if one or
both filters are running. Discharge duration varies from 30 - 60 minutes.
The oil and solids collected by the OWS are pumped out by a contractor and taken off
site for recycling and disposal as needed. These cleanouts occur once a year, with the
last cleaning being completed inMarch of 2016.
S. Is facility covered under federal effluent limitation guidelines? No ® Yes ❑
If yes, specify the category? N/A
9. Principal product(s) produced: Electricity
Principal raw material(s) consumed: Natural gas, #2 diesel fuel, water
Briefly describe the manufacturing process(es):
The plant consists of five simple cvcle gas turbine generator units producin
approximately 180 megawatts each for a total generating capacity of approximately
900 megawatts. The primary fuel consumed is natural gas with #2 diesel fuel as a
secondary fuel. Raw water is processed through portable demineralizer trailers
and stored in a 1.4 million gallon tank.
During the operation of the units, demineralized water is injected into the units for
NOx control.
The plant is dispatched for peaking and back-up power to support the regulated
Duke Energy system.
Page 2 of 5 C -MI 10/08

NPDES PERMIT APPLICATION - SHORT FORM C - Minor Industrial
Minor industrial, manufacturing and commercial facilities:
10. Amount of principal product produced or raw material consumed
;t specific amounts consumed and/or units ofproduction over the last three ears
Product Produced or Raw I Product Produced or Raw I Product Produced or Raw I Product Produced or Raw
Material Consumed 2013-2015 1 Material Consumed 2013-2015 Material Consumed 2013-2015 1 Material Consumed 2013-2015
per Day 69,000 MMBTU of Natural Gas 86,000 MMBTU of Natural Gas 28,500 MMBTU of Fuel Oil 73,000 MMBTU of Fuel Oil
per Month 400,000 MMBTU of Natural Gas 692,000 MMBTU of Natural Gas 57,000 MMBTU of Fuel Oil 170,000 MMBTU of Fuel Oil
per Year 4,800,000 MMBTU of Natural Gas 8,300,000 MMBTU of Natural Gas 228,000 MMBTU of Fuel Oil 510,000 MMBTU of Fuel Oil
11. Frequency of discharge: Continuous ❑ Intermittent
If intermittent:
Days per week discharge occurs: 3-5 Duration: 0.5 - 1 hours
12. Types of wastewater discharged to surface waters only
Discharge
Flow
GALLONS PER DAY
Sanitary - monthly average
N/A - Site has septic tank system.
Utility water, etc. - monthly average
1,000 gpd
Process water - monthly average
N/A - Process water is consumed in the operation of
the units.
Stormwater - monthly average
9,000 - 12,000 gpd per discharge event depending on
rainfall amounts.
Other - monthly average
Explain:
N/A
Monthly Average
31,000 gpd
total discharge (all types)
13. Number of separate discharge points: 1 Outfall Identification number(s) 001
14. Name of receiving stream(s) (Provide a map showing the exact location of each outfall,
including latitude and longitude):
Unnamed tributary of Little Jacobs Creek; flows to Jacob's Creek and ultimately to the Dan River
in the Roanoke River Basin. Outfall is located at 36° 19'42" N and 79° 49'45" W.
Page 3 of 5 C -MI 10/08

NPDES PERMIT APPLICATION - SHORT FORM C - Minor Industrial
Minor industrial, manufacturing and commercial facilities.
15. Effluent Data [for new or proposed discharges]
Provide data for the parameters listed. Temperature and pH shall be grab samples, for all other parameters 24-
hour composite sampling shall be used. If more than one analysis is reported, report daily maximum and
monthly average. If only one analysis is reported, report as daily maximum.
NOTE: Permittees requesting renewal should complete the table ONLY for the parameters
currently monitored. Summarize the past 3 years of effluent data.
Parameter
Daily
Maximum
Monthly
Average
Units of
Measurement
Biochemical Oxygen Demand (BOD5)
Chemical Oxygen Demand (COD)
Total Organic Carbon
Total Suspended Solids
11.0
5.0
mg/l
Ammonia as N
Temperature (Summer)
30.80
23.6°
Degrees Celsius
Temperature (Winter)
25.6°
14.10
Degrees Celsius
pH
Fecal Coliform (If sanitary waste is
present)
Total Residual Chlorine (if chlorine is
used)
Flow (MGD)
0.069
0.031
MGD
Naphthalene
*
*
ug/l
Benzene
<1.0
<1.0
ug/l
Toluene
<1.0
<1.0
ug/l
Ethyl Benzene
<1.0
<1.0
ug/l
Xylene
<1.0
<1.0
ug/l
* - Not currently monitored
16. List all permits, construction approvals and/or applications (check all that apply and provide permit
numbers or check none if not applicable):
Type
Hazardous Waste (RCRA)
UIC (SDWA)
NPDES
PSD (CAA)
Non -attainment program
Permit Number Type
NCR000012930 NESHAPS (CAA)
NCO086665
Ocean Dumping (MPRSA)
Dredge or fill (Section 404 or
Other
Permit
Number
08731T15
FRP04NC440
(Facility Response Plan)
Page 4 of 5 C -MI 10/08

NPDES PERMIT APPLICATION - SHORT FORM C - Minor Industrial
Minor industrial, manufacturing and commercial facilities.
17. List any chemicals that may be discharged (Please list and explain source and potential
amounts.)
Diesel Fuel - Catastrophic failure of fuel system could result in diesel fuel being discharged from
the site. This facility is covered under a Facility Response Plan (FRP). In a worst case scenario, a
maximum of 1.7 million gallons of diesel fuel could be released.
18. Is this facility located on Indian country? (check one)
Yes ❑ No
19. Applicant Certification
I certify that I am familiar with the information contained in the application and that to the
best of my knowledge and belief such information is true, complete, and accurate.
Lawrence D. Sparks Rockingham CT Station Manager
Printed name of Person Signing Title
Signature of Applicant
Date
North Carolina General Statute 143-215.6 (b)(2) provides that: Any person who knowingly makes any false
statement representation, or certification in any application, record, report, plan, or other document files or
required to be maintained under Article 21 or regulations of the Environmental Management Commission
implementing that Article, or who falsifies, tampers with, or knowingly renders inaccurate any recording or
monitoring device or method required to be operated or maintained under Article 21 or regulations of the
Environmental Management Commission implementing that Article, shall be guilty of a misdemeanor
punishable by a fine not to exceed $25,000, or by imprisonment not to exceed six months, or by both. (18
U.S.C. Section 1001 provides a punishment by a fine of not more than $25,000 or imprisonment not more
than 5 years, or both, for a similar offense.)
Page 5 of 5 C -MI 10/08

Community 22
Makeup Walep
i
1
'Potable
Water
Systerri
1
On -Site
Septic
Sys10m
Rockingham Combustion Turbine Water Schematic Diagram
NPOES Permit NCO086665 - Rockingham County
NOx infraction
•Water
300 (only When burning 50 (when burning gas) i 11vaporatsan
liquid fuels)
Demineralizer
Service Water 300 Rental 300 Water Storage 4n -Line CT
Storage Tank1-1 Tank Compfe5Sor
QernineraldzOr
0.5 MG Capacity 1.4 MG Capacity Intermittent Walsh
t
i
3.
i
1
$ 12a
a
Service
'Water,
system
1�
Area i
V'Iashdown i
rdr
Cohdivioner
1
Intermittent
Evap0ralion 1:000 gallyr
1 1055
Int€ written(
816wdoain
Uralls 1.4
20•
InWAir.Evaporaii've
Cooling�Systom
Conlacl Stormwater I l
(from containments, I '01IMVeter
around oil storage Separator
solaces) 25
Intermittent
25
Oily Water
Intermittent
Blowdown
Unit 5
5
OE Une.CT
Compressor
Wash
-J:
Wastewater
Sump
i
1,000 gallyr
Off -Sit. disposal k
Intermittent
IVastcgn^eel
slorri ater
OUTFALL,
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LLQtx The majority of these flows should be considered intermittent Flow Unit— Gatllons Per Minute (gpm)
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DUKE ENERGY
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Dalix'023120111 flOus

Water Resources
ENVIRONMENTAL QUALITY
PAT MCCRORY
Governor
DONALD R. VAN DER VAART
Secretary
S. JAY ZIMMERMAN
Director
November 7, 2016
Mr. Lawrence Sparks
Duke Energy Carolinas, LLC.
240 Easnest Drive
Reidsville, NC 27320
Subject: Permit Renewal
Application No. NCO086665
Rockingham Combustion Turbine Facility
Rockingham County
Dear Permittee:
The Water Quality Permitting Section acknowledges receipt of your permit application and
supporting documentation received on October 17, 2016. The primary reviewer for this renewal
application is Joe Corporon.
The primary reviewer will review your application, and he will contact you if additional
information is required to complete your permit renewal. Per G.S. 150B-3 your current permit
does not expire until permit decision on the application is made. Continuation of the current permit
is contingent on timely and sufficient application for renewal of the current permit.
Please respond in a timely manner to requests for additional information necessary to
complete the permit application. If you have any additional questions concerning- renewal of the
subject permit, please contact Joe Corporon at 919-807-6394 or [e-mail].
Sincerely,
?Am %fecund
Wren Thedford
Wastewater Branch
cc: Central Files
NPDES
Winston-Salem Regional Office
State of North Carolina I Environmental Quality I Water Resources
1617 Mail Service Center I Raleigh, North Carolina 27699-1617
919-807-6300