NC0005088_Draft Permit_20180502

ROY COOPER
Governor
MICHAEL S.REGAN
Secretary
Water Resources LINDA CULPEPPER
Environmental Quality Interim Director
May 2,2018
Mr.Paul Draovitch, Senior Vice President EH&S
Duke Energy Carolinas,LLC
526 Church St.
Mail Code: EC3XP
Charlotte,NC 28202
Subject: Draft NPDES Permit Renewal
Permit NC0005088
Rogers Energy Complex
Cleveland&Rutherford Counties
Class II Facility—Sanitary WWTP
Dear Mr. Draovitch:
Enclosed with this letter is a copy of the Draft NPDES permit renewal for your facility. Please review this
draft carefully to ensure thorough understanding of the requirements and conditions it contains. There are
several changes from the draft permit transmitted on September 21,2016,including the following:
• Wastewater descriptions on the Supplement to Permit Cover Sheet were clarified to reflect the
wastewater flows that will be routed to the proposed wastewater basins.
• Effluent Limitations and Monitoring Requirements for Outfalls 102, 103, 110, 111, 113,114, 115,
116, 117, 121, 127, 128, 129, 130, 131,and 132 were eliminated from the permit.These seeps will
be covered under a Special Order of Consent.
• A statement was added to condition A. (6)Effluent Limitations and Monitoring Requirements for
outfall 005 to require submittal of Form 2C Parts V and VI within 180 days of commencement of
operations.
• The Division reevaluated the temperature mixing zone requirements carried over from the
previous permit.After reviewing effluent data and current operations the Division believes it is
appropriate to remove the mixing zone for outfall 002.
• A mixing zone was established for outfall 005 based on the Cormix model. See Special Condition
A. (27).
• Added limits for 126 pollutants for outfall 005 since the cooling tower blowdown will be routed to
this outfall.
• The RPA for outfall 005 was revised using the new thallium criteria. As a result of the RPA the
limit for thallium was eliminated from outfall 005.
• The requirement to use physical-chemical treatment for decanting and dewatering was eliminated
from the permit. The permittee shall install physical-chemical treatment if necessary to meet the
water quality standards.
— Nothing Compares
State of North Carolina I Environmental Quality
1611 Mail Service Center I Raleigh,North Carolina 27699-1611
919-707-9000

• The groundwater monitoring well construction and sampling condition was eliminated from the
permit.
• Special Condition A. (30) Compliance Boundary special condition was added to the permit. The
groundwater compliance boundary map was added to the permit.
• The Instream Monitoring and Fish Tissue Monitoring Near Ash Pond special conditions were
modified to clarify requirements,please see A.(13)and A. (14).
Concurrent with this notification the Division is publishing a notice in a newspaper having circulation in
the general Rutherford/Cleveland Counties area, soliciting public comments on this draft permit.Please
provide any written comments you may have to the following:NCDEQ/DWR,NPDES Permitting
Branch, 1617 Mail Service Center,Raleigh,NC 27699-1617 no later than 30 days after receipt of this
draft permit.
Following the 30-day public comment period,the Division will review all pertinent comments and take
appropriate action prior to issuing a final permit. If you have questions concerning this draft permit,
please call me at(919) 807-6387or by email at [e-mail].
Sincerely,
Teresa Rodriguez,Engineer
NPDES Complex Permitting Unit
Hardcopy: NPDES Files
Ecopy: US EPA Region 4
DWR/Wastewater Operator Certification/Maureen Kinney
DWR/Aquatic Toxicology Branch/Susan Meadows
DWR/Asheville Regional Office/Water Quality

Permit No.NC0005088
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provisions of North Carolina General Statute 143-215.1,other lawful standards and
regulations promulgated and adopted by the North Carolina Environmental Management Commission,
and the Federal Water Pollution Control Act,as amended,
Duke Energy Carolinas,LLC
is hereby authorized to discharge wastewater from a facility located at
Rogers Energy Complex
573 Duke Power Rd
Mooresboro
Cleveland& Rutherford County
to receiving waters designated as the Broad River in the Broad River Basin
in accordance with effluent limitations,monitoring requirements,and other conditions set forth in Parts I,
II,and III hereof.
This permit shall become effective.
This permit and authorization to discharge shall expire at midnight on.
Signed this day .
Linda Culpepper,Interim Director
Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 28

Permit No.NC0005088
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility,whether for operation or discharge are hereby
revoked. As of this permit issuance,any previously issued permit bearing this number is no longer
effective.Therefore,the exclusive authority to operate and discharge from this facility arises under the
permit conditions,requirements,terms,and provisions included herein.
Duke Energy Carolinas, LLC is hereby authorized to:
1. Continue to operate the following systems located at the Rogers Energy Complex,573 Duke Power Rd,
Mooresboro,in Rutherford&Cleveland Counties:
• Outfall 002-Ash Basin Treatment System.Continue to discharge treated wastewater from the ash basin
through outfall 002, containing low volume wastes, coal pile runoff, metal cleaning wastes, treated
domestic wastewater,chemical metal cleaning wastes,water treatment system wastewaters,ash transport
water, landfill leachate (landfill contains fly and bottom ash, and gypsum from FGD system), cooling
towers blowdown,runoff from limestone stacking area and gypsum stacking area. Upon commencement
of the discharge from Outfall 005 Wastewater Treatment System discharge treated wastewater from the
ash basin decanting and dewatering.
• Internal Outfall 004 - Flue Gas Desulfurization Treatment System. Continue to operate a FGD wet
scrubber treatment system consisting of equalization tank,reaction tank,clarifier,filters,and effluent tank
discharging to the ash basin (Outfall 002). Upon commencement of the discharge from Outfall 005
Wastewater Treatment System discharge the effluent from the FGD treatment system and the heat
exchanger non-contact cooling water combined with the effluent of the Wastewater Treatment System
(outfall 005).
• Outfall 005 - Wastewater Treatment System (WWTS). Upon commencement of the discharge from the
new Wastewater Treatment System, discharge holding basin effluent (Outfall 002C - Unit 5 fly ash silo
sump,coal pile runoff,gypsum pile runoff and limestone pile runoff),Basement Basin effluent(RO reject,
Unit 5 process and stormwater and Unit 6 sanitary system), Unit 6 cooling tower blowdown, landfill
leachate, Unit 6 process sump (mechanical drag chain overflow, and cooling tower raw water treatment
wastwaters, Unit 5 process sump (sanitary system, low volume wastes, mechanical drag chain overflow
and cooling tower blowdown), ash basin dewatering/decanting. The FGD WWTS discharge (Internal
Outfall 004) and heat exchanger non-contact cooling water will be combined with the discharge from the
WWTS before discharge to the Broad River.
• Outfall 002B - Basement Basin Overflow. Discharge overflow from a 100 yr 24 hr storm event. The
Basement Basin receives wastewater from the Unit 6 sanitary system,Unit 5 stormwater and low volume
wastes and RO reject.
• Outfall 002C-Holding Basin Emergency Overflow. Discharge overflow from a 100 yr 24 hr storm event
from the Holding Basin. The Holding Basing receives wastewater from the coal pile runoff,gypsum pile
runoff,limestone pile runoff,Unit 5 fly ash silo sump and Basement Basin auxiliary basin overflow.
• Outfalls 104 and 106-Constructed Seeps.Continue to discharge seepage from outfall 104(lat 35°13'3.5"
long 81°45'9.3")and outfall 106 (lat 35°13'6.3" long 81°44'53.7').
Page 2 of 28

Permit No.NC0005088
2. Discharge from said treatment works at the location specified on the attached map into the Broad River
classified as WS-IV water in the Broad River Basin.
Dom,
•
Page 3 of 28

Permit No. NC0005088
PART I
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [15A NCAC 02B .0400 et seq., 02B
.0500 et seq.]
During the period beginning on the effective date of the permit and lasting until commencement of dewatering or
expiration,the Permittee is authorized to discharge from outfall 002-ash pond effluent(decanting the free water
above the settled ash layer that does not involve mechanical disturbance of the ash). Such discharges shall be
limited and monitored1 by the Permittee as specified below:
Discharge Limitations Monitoring Requirements
Effluent Characteristics Monthly Daily Measurement Sample
Average Maximum Frequency Sample Type 2
g q cY Location
Flow(MGD) Weekly Calculation or E
similar readings
Oil and Grease 15.0 mg/L 20.0 mg/L Monthly Grab E
Total Suspended Solids3.4 30.0 mg/L 50.0 mg/L Monthly Grab E
Total Copper 102µg/L 111 µg/L See Note 5 Grab E
Total Iron 1.0 mg/L 1.0 mg/L See Note 5 Grab E
Total Chromium 0.2 mg/L 0.2 mg/ Monthly Grab E
Y
Total Zinc 1.0 mg/L 1.0 mg/L Monthly Grab E
Total Residual Chlorine6 28µg/L 2/Month Grab E
Total Selenium,µg/L Monthly Grab E
Total Cadmium,µg/L Monthly Grab E
Total Mercury 7,ng/L Monthly Grab E
Total Arsenic,µg/L Monthly Grab E
Total Lead,µg/L Monthly Grab E
Total Thallium Monthly Grab E
PH 8 6.0 to 9.0 S.U. 2/Month Grab E
Total Dissolved Solids Monthly Grab E
Hardness-Total as Quarterly Grab E
[CaCO3or(Ca+ Mg)] mg/L
Turbidity 9,NTU Monthly Grab E
BODS 30 mg/1 45 mg/1 Monthly Grab E
Fecal Coliform 200/100 mL 400/100 mL Monthly Grab E
Total Nitrogen
(NO2+NO3+TKN) Quarterly Grab E
Total Phosphorus Quarterly Grab E
Chronic Toxicity 10 Quarterly Grab E
Temperature Weekly Grab E
126 pollutants contained in
chemicals added for cooling
tower maintenance(except No detectable amounts 11 Annual Grab E
Total chromium and Total
Zinc)
Page 4 of 28

Permit No.NC0005088
Notes:
1. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application
system.See Special Condition A.(28).
2. Sample Locations:E-Effluent;Effluent sampling shall be conducted at the discharge from the ash settling pond
prior to mixing with any other waste streams.
3. A total suspended solids monthly average of 50 mg/L is permitted provided that the permittee can satisfactorily
demonstrate that the difference between the monthly average of 30 mg/L and 50 mg/L is the result of the
concentration of total suspended solids in the intake water.
4. The facility shall continuously monitor TSS concentration when the decanting process commences(and the pump
is operating)and the decanting pump shall be shut off automatically when one half of the Daily Maximum limit
(15 minutes average) is exceeded. Pumping will be allowed to continue if interruption might result in a dam
failure or damage.
5. Monitoring shall be per occurrence of chemical metal cleaning and sample shall be from a representative
discharge.
6. The Division shall consider all effluent TRC values reported below 50µg/L to be in compliance with the permit.
However, the permittee shall continue to record and submit all values reported by a North Carolina certified
laboratory(including field certified),even if these values fall below 50µg/L.Neither free available chlorine(FAC)
nor TRC may be discharged from any single generating unit for more than two hours in any single day,and not
more than one unit in the plant may discharge FAC or TRC,unless the discharger demonstrates to the Division
that the unit(s)cannot operate at or below this level of chlorination.
7. The facility shall employ method 1631E.
8. The facility shall continuously monitor pH when the decanting process commences(and the pump is operating)
and the decanting pump shall be shut off automatically when 15 minutes running average pH falls below 6.1
standard units or rises above 8.9 standard units.Pumping will be allowed to continue if interruption might result
in a dam failure or damage.
9. The discharge from this facility shall not cause turbidity in the receiving stream to exceed 50 NTU. If the instream
turbidity exceeds 50 NTU due to natural background conditions,the discharge cannot cause turbidity to increase
in the receiving stream. Therefore, if the effluent measurement exceeds 50 NTU, the Permittee shall sample
• upstream and downstream turbidity in the receiving waterbody, within 24 hours, to demonstrate the existing
turbidity level in the receiving waterbody was not increased.All data shall be reported on the DMRs. (See 15A
NCAC 2B.0211 (21)). NTU-Nephelometric Turbidity Unit
10. Chronic Toxicity(Ceriodaphnia)P/F at 7.7 % quarterly;See condition A. (9)of this permit.
11. Limitations and monitoring requirements for the 126 Priority Pollutants (per 40 CFR Part 423, Appendix A,
exclusive of zinc and chromium) apply only if these substances are added by the permittee for cooling tower
maintenance. Compliance with the limitations for the 126 priority pollutants in 40 CFR 423.13 (d)(1) may be
determined by engineering calculations which demonstrate that the regulated pollutants are not detectable in the
final discharge by the analytical methods in 40 CFR Part 136. All primary industries are required to submit a
priority pollutant analysis in accordance with 40 CFR Part 122 with their application for permit renewal.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
By November 1,2020 there shall be no discharge of pollutants in bottom ash transport waters.This requirement
only applies to bottom ash transport water generated after November 1,2020.
In accordance with N.C.G.S.§130A-309.210,by December 31,2019,the facility shall convert to the disposal of dry
bottom ash,as defined in the Coal Ash Management Act("CAMA").
Fly ash is dry handled at this facility.
The facility is allowed to drawdown the wastewater in the ash pond to no less than three feet above the ash.
Page 5 of 28

Permit No.NC0005088
The facility shall use a floating pump station with free water skimmed from the basin surface using an adjustable
weir.
The limits and conditions in Section A.(2)of the permit apply when water in the ash settling basin is lowered
below the three feet trigger mark,measured at the pump intake.
The facility shall notify via e-mail DWR Complex NPDES Permitting Unit and DWR Asheville Regional Office
seven calendar days prior to the commencement of the dewatering.
The rate for lowering the liquid level in a coal ash pond shall not exceed one(1)foot per day unless a higher rate is
supported to the satisfaction of DEMLR and in accordance with NCAC,Title 15A,Subchapter 2K.
When the facility commences the ash pond decanting/dewatering,the facility shall treat the wastewater discharged
from the ash pond using physical-chemical treatment,if necessary,to assure state Water Quality Standards are not
contravened in the receiving stream.Duke Energy shall notify DWR NPDES Permitting and DWR Asheville
Regional Office,in writing,within seven calendar days of installing additional physical-chemical treatment at this
Outfall.
Page 6 of 28

Permit No.NC0005088
A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [15A NCAC 02B .0400 et seq., 02B
.0500 et seq.]
During the period beginning on the commencement of the dewatering operation and lasting until permit expiration,
the Permittee is authorized to discharge from outfall 002 (Dewatering - removing the interstitial water). Such
discharges shall be limited and monitored'by the Permittee as specified below:
Discharge Limitations Monitoring Requirements
Effluent Characteristics Monthly Daily Measurement Sample
Average Maximum Frequency Sample Type 2
g q cy Location
Flow(MGD) 1 MGD Weekly Calculation or Effluent
similar readings
Oil and Grease 15.0 mg/L 20.0 mg/L Monthly Grab Effluent
Total Suspended Solids3 30.0 mg/L 50.0 mg/L Monthly Grab Effluent
Total Chromium 0.2 mg/L 0.2 mg/L Weekly Grab Effluent
Total Zinc 1.0 mg/L 1.0 mg/L Weekly Grab Effluent
Total Cadmium,µg/L Weekly Grab Effluent
Total Copper,µg/L Weekly Grab Effluent
Total Iron,µg/L Weekly Grab Effluent
Total Lead,µg/L Weekly Grab Effluent
Total Mercury'',ng/L Weekly Grab Effluent
Total Arsenic,µg/L Weekly Grab Effluent
Total Selenium,µg/L Weekly Grab Effluent
Total Molybdenum,µg/L Weekly Grab Effluent
Total Thallium,µg/L Weekly Grab Effluent
Total Dissolved Solids Weekly Grab Effluent
Chronic Toxicity3 Monthly Grab Effluent
Total Nitrogen Effluent
(NO2+NO3+TKN) Quarterly Grab
Total Phosphorus Quarterly Grab Effluent
pH 6 6.0 to 9.0 S.0 2/Month Grab Effluent
Turbidity 7,NTU Weekly Grab Effluent
Hardness-Total as Effluent
[CaCO3 or(Ca+Mg)] mg/L Quarterly Grab
Temperature Weekly Grab Effluent
126 pollutants contained in
chemicals added for cooling
tower maintenance(except No detectable amounts" Annual Grab Effluent
Total chromium and Total
Zinc)
Page 7 of 28

Permit No.NC0005088
Notes:
1. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application
system.See Special Condition A.(28).
2. Sample Locations:Effluent sampling shall be conducted at the discharge from the ash settling pond prior to
mixing with any other waste streams.
3. The facility shall continuously monitor TSS concentration when the dewatering process commences'(and the
pump is operating) and the dewatering pump shall be shut off automatically when one half of the Daily
Maximum limit(15 minutes average)is exceeded.Pumping will be allowed to continue if interruption might
result in a dam failure or damage.
4. The facility shall employ method 1631E.
5. Chronic Toxicity Monthly(Ceriodaphnia)P/F at 0.5 %;See condition A. (10)of this permit.
6. The facility shall continuously monitor pH when the dewatering process commences(and the pump is
operating)and the dewatering pump shall be shut off automatically when 15 minutes running average pH
falls below 6.1 standard units or rises above 8.9 standard units.Pumping will be allowed to continue if
interruption might result in a dam failure or damage.
7. The discharge from this facility shall not cause turbidity in the receiving stream to exceed 50 NTU. If the
instream turbidity exceeds 50 NTU due to natural background conditions, the discharge cannot cause
turbidity to increase in the receiving stream. Therefore, if the effluent measurement exceeds 50 NTU, the
Permittee shall sample upstream and downstream turbidity in the receiving waterbody,within 24 hours,to
demonstrate the existing turbidity level in the receiving waterbody was not increased. All data shall be
reported on the DMRs. (See 15A NCAC 2B.0211 21 .NTU-Nephelometric TurbidityUnit
P ( )) P
8. Limitations and monitoring requirements for the 126 Priority Pollutants(per 40 CFR Part 423,Appendix A,
exclusive of zinc and chromium)apply only if these substances are added by the permittee for cooling tower
maintenance. Compliance with the limitations for the 126 priority pollutants in 40 CFR 423.13(d)(1)may be
determined by engineering calculations which demonstrate that the regulated pollutants are not detectable
in the final discharge by the analytical methods in 40 CFR Part 136. All primary industries are required to
submit a priority pollutant analysis in accordance with 40 CFR Part 122 with their application for permit
renewal.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
By November 1,2020 there shall be no discharge of pollutants in bottom ash transport waters.This requirement
only applies to bottom ash transport water generated after November 1,2020.
In accordance with N.C.G.S.§130A-309.210,by December 31,2019,the facility shall convert to the disposal of dry
bottom ash,as defined in the Coal Ash Management Act("CAMA").
Fly ash is dry handled at this facility.
There shall be no discharge of metal cleaning wastes to the ash basin once the dewatering operations commence.
The facility shall notify via e-mail DWR Complex NPDES Permitting Unit and DWR Asheville Regional Office
seven calendar days prior to the commencement of the dewatering.
The rate for lowering the liquid level in a coal ash pond shall not exceed one(1)foot per day unless a higher rate is
supported to the satisfaction of DEMLR and in accordance with NCAC,Title 15A,Subchapter 2K
When the facility commences the ash pond decanting/dewatering,the facility shall treat the wastewater discharged
from the ash pond using physical-chemical treatment,if necessary,to assure state Water Quality Standards are not
contravened in the receiving stream.Duke Energy shall notify DWR NPDES Permitting and DWR Asheville
Regional Office,in writing,within seven calendar days of installing additional physical-chemical treatment at this
Outfall.
Page 8 of 28

Permit No.NC0005088
A. (3)EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [15A NCAC 02B .0400 et seq.,02B
.0500 et eq.]
During the period beginning upon commencement of operations of the new holding cell and lasting until expiration,
the Permittee is authorized to discharge from outfall 002B-Basement Basin Emergency Overflow. Such discharges
shall be limited and monitored'by the Permittee as specified below:
Discharge Limitations Monitoring Requirements
Effluent Characteristics Monthly Daily Measurement Sample
Average Maximum Frequency Sample Type Location
Flow(MGD) Per discharge Estimate Effluent
event
Oil and Grease 15 mg/L 20 mg/L Per discharge Grab Effluent
event
Total Suspended Solids 30 mg/L 100 mg/L Per discharge Grab Effluent
event
pH 6.0 to 9.0 S.U. Per discharge Grab Effluent
event
BODS 30 mg/L 45 mg/L Per discharge Grab Effluent
event
Fecal Coliform 200/100 mL 400/100 mL Per discharge Grab Effluent
event
Total Copper 102µg/L 111 µg/L See Note 2 Grab Effluent
Total Iron 1.0 mg/L 1.0 mg/L See Note 2 Grab Effluent
Acute Toxicity3 Per discharge Grab Effluent
event
Notes:
1. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application
system. See Special Condition A. (28).
2. Monitor only if the emergency overflow is used when chemical metal cleaning waste is being discharged.
3. Acute Toxicity-Per discharge event,See Special Condition A. (12).
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Episodic sampling is required per occurrence when pond overflows occur for longer than one hour. All
samples shall be of a representative discharge.The Division shall be notified in writing when the basin
discharges and the duration of the discharge.This notification shall be submitted within 10 days of the
discharge to the following address:
Asheville Water Quality Regional Operations Section NPDES Complex Permitting Unit
2090 U.S. 70 Highway 1617 Mail Service Center
Swannanoa,NC 28778-8211 Raleigh,NC 2276994617
Page 9 of 28

Permit No.NC0005088
A. (4) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [15A NCAC 02B .0400 et seq.,02B
.0500 et seq.]
During the period beginning upon commencement of operations of the new holding basin and lasting until
expiration,the Permittee is authorized to discharge from outfall 002C-Holding Basin Emergency Overflow. Such
discharges shall be limited and monitored)by the Permittee as specified below:
Discharge Limitations Monitoring Requirements
Effluent Characteristics Monthly Daily Measurement Sample
Average Maximum Frequency Sample Type Location
Per discharge
Flow(MGD) Estimate Effluent
event
Per discharge Effluent
Oil and Grease 15 mg/L 20 mg/L Grab
event
Per discharge Effluent
Total Suspended Solids 30 mg/L 50 mg/L Grab
event
Per discharge Effluent
pH 6.0 to 9.0 S.U. Grab
event
BODS 30mg/L 45 mg/L Per discharge Grab Effluent
event
Per discharge Effluent
Fecal Coliform 200/100 mL 400/100 mL Grab
event
Total Copper 102µg/L 111 µg/L See Note 2 Grab Effluent
Total Iron 1.0 mg/L 1.0 mg/L See Note 2 Grab Effluent
Acute Toxicity3 Per discharge Grab Effluent
event
Notes:
1. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application
system. See Special Condition A. (28).
2. Monitor only if the emergency overflow is used when chemical metal cleaning waste is being discharged.
3. Acute Toxicity-Per discharge event,See Special Condition A. (12).
Episodic sampling is required per occurrence when pond overflows occur for longer than one hour. All
samples shall be of a representative discharge.The Division shall be notified in writing when the basin
discharges and the duration of the discharge.This notification shall be submitted within 10 days of the
discharge to the following address:
Asheville Water Quality Regional Operations Section NPDES Complex Permitting Unit
2090 U.S.70 Highway 1617 Mail Service Center
Swannanoa,NC 28778-8211 Raleigh,NC 227699-1617
Page 10 of 28

Permit No.NC0005088
A.(5.)EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [15A NCAC 02B.0400 et seq.,
02B .0500 et seq.]
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is
authorized to discharge from internal outfall 004- FGD Wastewater Treatment System. Such discharges shall be
limited and monitored)by the Permittee as specified below:
Discharge Limitations Monitoring Requirements
Effluent Characteristics Monthly Daily Measurement Sample
Average Maximum Frequency Sample Type Location2
Flow Monthly Pump Logs or Effluent
similar readings
Total Suspended Solids 30 mg/L 100 mg/L Quarterly Grab Effluent
Oil and Grease 15 mg/L 20 mg/L Quarterly Grab Effluent
Total Arsenic3 8 pg/L 11 pg/L Quarterly Grab Effluent
Total Mercury3 356 ng/L 788 ng/L Quarterly Grab Effluent
Total Selenium3 12 pg/L 23 pg/L Quarterly Grab Effluent
Nitrate&Nitrite as N3 4.4 mg/L 17 mg/L Quarterly Grab Effluent
pH Quarterly Grab Effluent
Notes:
1. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application
system. See Special Condition A. (28).
2. Samples taken in compliance with the monitoring requirements listed above shall be taken prior to mixing
with other sources of wastewater.
3. In accord with the Steam Electric Effluent Limitations Guidelines for FGD wastewater(40 C.F.R.423),these
limits shall become effective on December 31,2023. This permit may be reopened and modified if changes are
made to 40 C.F.R.423.
Page 11 of 28

Permit No.NC0005088
A. (6.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [15A NCAC 02B .0400 et seq., 02B
.0500 et seq.]
During the period beginning upon commencement of discharge from the new WWTS and lasting until permit
expiration,the Permittee is authorized to discharge from outfall 005-WWTS. Such discharges shall be limited and
monitored)by the Permittee as specified below:
Discharge Limitations Monitoring Requirements
Effluent Characteristics Monthly Daily Measurement Sample
Average Maximum Frequency Sample Type 2
g q cy Location
Flow(MGD) Continuous Recorder3 E
Oil and Grease 15.0 mg/L 20.0 mg/L 2/Month Grab E
Total Suspended Solids 30.0 mg/L 50.0 mg/L 2/Month Composite E
Total Copper 251µg/L 272µg/L See Note 4 Grab E
Total Iron 1.0 mg/L 1.0 mg/L See Note 4 Grab E
Total Chromium 0.2 mg/L 0.2 mg/L Monthly Grab E
Total Zinc 1.0 mg/L 1.0 mg/L Monthly Grab E
Chronic Toxicity5 Quarterly Composite E
Total Nitrogen
(NO2+NO3+TIQV) Quarterly Composite E
Total Phosphorus Quarterly Composite E
pH 6.0 to 9.0 S.U. 2/Month Grab E
Total Residual Chlorine6 28µg/L 2/Month Grab E
BOD,5-day,20°C 30.0 mg/L 45.0 mg/L Monthly Composite E
Fecal Coliform(geo. mean) 200/100 mL 400/100 mL Monthly Composite E
Hardness-Total as
[CaCO3 or(Ca+Mg)] mg/L Quarterly Grab E,U
Temperatures 100"F Weekly Grab E
Temperature Weekly Grab U,D
Total Selenium8,µg/L Monthly/Weekly Grab E
Total Cadmium8,µg/L Monthly/Weekly Grab E
Total Mercury8.9,ng/L Monthly/Weekly Grab E
Total Arsenic8,pg/L Monthly/Weekly Grab E
Total Lead8,µg/L Monthly/Weekly Grab E
Total Thallium8 .tg/L Monthly/Weekly Grab E
Total Molybdenums,µg/L Monthly/Weekly Grab E
Total Dissolved Solids8 Monthly/Weekly Grab E
126 pollutants contained in
chemicals added for cooling
tower maintenance(except No detectable amounts 10 Annual Grab E
Total chromium and Total
Zinc)
Page 12 of 28

Permit No.NC0005088
Notes:
1. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR
application system. See Special Condition A.(28).
2. Sample Locations:E-Effluent from treatment system,U-upstream at the Station Intake,and D-at least 476
feet from the discharge.
3. Flow may be measured by pump logs.
4. Monitoring shall be per occurrence of chemical metal cleaning and sample shall be from a representative
discharge.
5. Chronic Toxicity(Ceriodaphnia)P/F at 3.14%;March,June,September,and December;See Special Condition
A.(11)of this permit.
6. The Division shall consider all effluent TRC values reported below 50 µg/L to be in compliance with the
permit. However,the permittee shall continue to record and submit all values reported by a North Carolina
certified laboratory(including field certified),even if these values fall below 50µg/L. Neither free available
chlorine(FAC)nor TRC may be discharged from any single generating unit for more than two hours in any
single day, and not more than one unit in the plant may discharge FAC or TRC, unless the discharger
demonstrates to the Division that the unit(s)cannot operate at or below this level of chlorination.
7. See Special Condition A.(27)Temperature Mixing Zone.
8. Monthly monitoring is required during decanting,weekly monitoring during dewatering.
9. The facility shall employ method 1631E.
10. Limitations and monitoring requirements for the 126 Priority Pollutants (per 40 CFR Part 423,Appendix A,
exclusive of zinc and chromium)apply only if these substances are added by the permittee for cooling tower
maintenance. Compliance with the limitations for the 126 priority pollutants in 40 CFR 423.13(d)(1)may be
determined by engineering calculations which demonstrate that the regulated pollutants are not detectable
in the final discharge by the analytical methods in 40 CFR Part 136. All ptimary industries are required to
submit a priority pollutant analysis in accordance with 40 CFR Part 122 with their application for permit
renewal.
Within 180 days of the commencement of operations of the treatment system the permittee shall submit Items V
and VI of NPDES application Form 2C.
All domestic wastewater produced at the power plant is to be fully treated through the onsite wastewater treatment
system prior to being discharged.
The permittee shall obtain authorization from the Division prior to using any biocide in the cooling water;see
condition A. (20).
There shall be no discharge of floating solids or foam visible in other than trace amounts.
See Special condition A. (29) Notification of Start-up.
Page 13 of 28

Permit No.NC0005088
A.(7.)EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS Outfall 104 [15A NCAC 02B .0400 et
seq.,02B.0500 et seq.]
During the period beginning on the effective date of this permit and lasting until expiration,the Permittee is
authorized to discharge from outfall 104-constructed seep.Such discharges shall be limited and monitored'by
the Permittee as specified below:
Effluent Discharge Limitations Monitoring Requirements
Characteristics Monthly Daily Measurement Sample Sample
Average Maximum Frequency2 Type Location
Flow,MGD Monthly/Quarterly Estimate Effluent
pH 6.0 to 9.0 S.U. Monthly/Quarterly Grab Effluent
TSS 30.0 mg/L 100.0 mg/L Monthly/Quarterly Grab Effluent
Oil and Grease 15.0 mg/L 20.0 mg/L Monthly/Quarterly Grab Effluent
Fluoride,µg/L Monthly/Quarterly Grab Effluent
Total Mercury3,ng/L Monthly/Quarterly Grab Effluent
Total Barium,mg/L Monthly/Quarterly Grab Effluent
Total Iron,µg/L Monthly/Quarterly Grab Effluent
Total Manganese,µg/L Monthly/Quarterly Grab Effluent
Total Zinc,µg/L Monthly/Quarterly Grab Effluent
Total Arsenic,µg/L Monthly/Quarterly Grab Effluent
Total Cadmium,µg/L Monthly/Quarterly Grab Effluent
Total Chromium,µg/L Monthly/Quarterly Grab Effluent
Total Copper,itg/L Monthly/Quarterly Grab Effluent
Total Lead,µg/L Monthly/Quarterly Grab Effluent
Total Nickel,µg/L Monthly/Quarterly Grab Effluent
Total Selenium,µg/L Monthly/Quarterly Grab Effluent
Nitrate/nitrite as N, Monthly/Quarterly Grab Effluent
mg/L
Sulfates,mg/L Monthly/Quarterly Grab Effluent
Chlorides,mg/L Monthly/Quarterly Grab Effluent
TDS,mg/L Monthly/Quarterly Grab Effluent
Total Hardness,mg/L Monthly/Quarterly Grab Effluent
Turbidity' Monthly/Quarterly Grab Effluent
Temperature,0C Monthly/Quarterly Grab Effluent
Conductivity,µmho/cm Monthly/Quarterly Grab Effluent
Notes:
1. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application
system.See Special Condition A. (28).
2. The facility shall conduct monthly sampling from the effective date of the permit.After one year from the
effective date of the permit the monitoring will be reduced to quarterly.
3. The facility shall use EPA method 1631E.
4. The discharge from this facility shall not cause turbidity in the receiving stream to exceed 50 NTU. If the
instream turbidity exceeds 50 NTU due to natural background conditions,the discharge cannot cause turbidity
to increase in the receiving stream. Therefore,if the effluent measurement exceeds 50 NTU,the Permittee shall
sample upstream and downstream turbidity in the receiving waterbody,within 24 hours,to demonstrate the
existing turbidity level in the receiving waterbody was not increased.All data shall be reported on the DMRs.
(See 15A NCAC 2B.0211 (21)).
Page 14 of 28

Permit No.NC0005088
If no discharge occurs during the reporting period or the Permittee is unable to obtain a representative sample due
to low-flow conditions at the seep, the Permittee shall submit its DMR, as required, and indicate"No Flow" for the
seep outfall(15A NCAC 02B.0506(a)(1)(E)).
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 15 of 28

Permit No.NC0005088
A.(8)EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS Outfall 106 [15A NCAC 02B .0400 et
seq.,02B.0500 et seq.]
During the period beginning on the effective date of this permit and lasting until expiration,the Permittee is
authorized to discharge from outfall 106-constructed seep(Toe Drain).Such discharges shall be limited and
monitored)by the Permittee as specified below:
Effluent Discharge Limitations Monitoring Requirements
Characteristics Monthly Daily Measurement Monthly Daily
Average Maximum Frequency2 Average Maximum
Flow, MGD Monthly/Quarterly Estimate Effluent
pH 6.0 to 9.0 S.U. Monthly/Quarterly Grab Effluent
TSS 30.0 mg/L 100.0 mg/L Monthly/Quarterly Grab Effluent
Oil and Grease 15.0 mg/L 20.0 mg/L Monthly/Quarterly Grab Effluent
Fluoride,µg/L Monthly/Quarterly Grab Effluent
Total Mercury3,ng/L Monthly/Quarterly Grab Effluent
Total Barium,mg/L Monthly/Quarterly Grab Effluent
Total Iron,µg/L Monthly/Quarterly Grab Effluent
Total Manganese,µg/L Monthly/Quarterly Grab Effluent
Total Zinc,µg/L Monthly/Quarterly Grab Effluent
Total Arsenic,µg/L Monthly/Quarterly Grab Effluent
Total Cadmium,µg/L Monthly/Quarterly Grab Effluent
Total Chromium,µg/L Monthly/Quarterly Grab Effluent
Total Copper,µg/L Monthly/Quarterly Grab Effluent
Total Lead,µg/L Monthly/Quarterly Grab Effluent
Total Nickel,µg/L Monthly/Quarterly Grab Effluent
Total Selenium,µg/L Monthly/Quarterly Grab Effluent
Nitrate/nitrite as N, Monthly/Quarterly Grab Effluent
mg/L
Sulfates,mg/L Monthly/Quarterly Grab Effluent
Chlorides,mg/L Monthly/Quarterly Grab Effluent
TDS,mg/L Monthly/Quarterly Grab Effluent
Total Hardness,mg/L Monthly/Quarterly Grab Effluent
Turbidity4 Monthly/Quarterly Grab Effluent
Temperature,°C Monthly/Quarterly Grab Effluent
Conductivity,µmho/cm Monthly/Quarterly Grab Effluent
Notes:
1. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application
system. See Special Condition A.(28).
2. The facility shall conduct monthly sampling from the effective date of the permit.After one year from the
effective date of the permit the monitoring will be reduced to quarterly.
3. The facility shall use EPA method 1631E.
4. The discharge from this facility shall not cause turbidity in the receiving stream to exceed 50 NTU. If the
instream turbidity exceeds 50 NTU due to natural background conditions,the discharge cannot cause turbidity
to increase in the receiving stream. Therefore,if the effluent measurement exceeds 50 NTU,the Permittee shall
sample upstream and downstream turbidity in the receiving waterbody,within 24 hours,to demonstrate the
existing turbidity level in the receiving waterbody was not increased.All data shall be reported on the DMRs.
(See 15A NCAC 2B.0211 (21)).
Page 16 of 28

Permit No.NC0005088
If no discharge occurs during the reporting period or the Permittee is unable to obtain a representative sample due
to low-flow conditions at the seep, the Permittee shall submit its DMR, as required, and indicate"No Flow" for the
seep outfall(15A NCAC 02B .0506(a)(1)(E)).
There shall be no discharge of floating solids or visible foam in other than trace amounts.
A. (9.) CHRONIC TOXICITY PERMIT LIMIT(Quarterly) (Outfall 002-Ash Pond decanting) [15A NCAC
02B .0400 et seq., 02B .0500 et seq.]
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to
Ceriodaphnia dubia at an effluent concentration of 7.7%.
The permit holder shall perform at a minimum,quarterly monitoring using test procedures outlined in the"North
Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised December 2010,or subsequent versions or
"North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised-December 2010)or subsequent
versions.The tests will be performed during the months of January,April,July and October. These months
signify the first month of each three-month toxicity testing quarter assigned to the facility. Effluent sampling for
this testing must be obtained during representative effluent discharge and shall be performed at the NPDES
permitted final effluent discharge below all treatment processes. Effluent sampling for this testing must be
obtained during representative effluent discharge and shall be performed at the NPDES permitted final effluent
discharge below all treatment processes.
If the test procedure performed as the first test of any single quarter results in a failure or ChV below the permit
limit,then multiple-concentration testing shall be performed at a minimum,in each of the two following
months as described in"North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised-
December 2010) or subsequent versions.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form(MR-1)for the months in which tests were performed,using the parameter code TGP3B for the
pass/fail results and THP3B for the Chronic Value. Additionally,DWR Form AT-3(original)is to be sent to the
following address:
Attention: North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh,NC 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Water Sciences Section no later than 30 days after the
end of the reporting period for which the report is made.
Test data shall be complete,accurate,include all supporting chemical/physical measurements and all
concentration/response data,and be certified by laboratory supervisor and ORC or approved designate signature.
Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for
disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is required,the
permittee will complete the information located at the top of the aquatic toxicity(AT)test form indicating the
facility name,permit number,pipe number,county,and the month/year of the report with the notation of"No
Flow" in the comment area of the form. The report shall be submitted to the Water Sciences Section at the address
cited above.
f
Page 17 o 28

Permit No.NC0005088
Should the permittee fail to monitor during a month in which toxicity monitoring is required,monitoring will be
required during the following month.Assessment of toxicity compliance is based on the toxicity testing quarter,
which is the three month time interval that begins on the first day of the month in which toxicity testing is required
by this permit and continues until the final day of the third month.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division of Water
Resources indicate potential impacts to the receiving stream,this permit may be re-opened and modified to include
alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism
survival, minimum control organism reproduction, and appropriate environmental controls, shall constitute an
invalid test and will require immediate follow-up testing to be completed no later than the last day of the month
following the month of the initial monitoring.
A.(10.) CHRONIC TOXICITY PERMIT LIMIT (MONTHLY) (Outfall 002-Ash Pond Dewatering) [15A NCAC
02B.0400 et seq.,02B.0500 et seq.]
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to
Ceriodaphnia dubia at an effluent concentration of 0.5 %.
The permit holder shall perform at a minimum,monthly monitoring using test procedures outlined in the"North
Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised December 2010,or subsequent versions or
"North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised-December 2010)or subsequent
versions. Effluent sampling for this testing must be obtained during representative effluent discharge and shall be
performed at the NPDES permitted final effluent discharge below all treatment processes.
If the test procedure performed as the first test of any single quarter results in a failure or ChV below the permit
limit,then multiple-concentration testing shall be performed at a minimum,in each of the two following
months as described in"North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised-
December 2010)or subsequent versions.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form(MR-1)for the months in which tests were performed,using the parameter code TGP3B for the
pass/fail results and THP3B for the Chronic Value. Additionally,DWR Form AT-3(original)is to be sent to the
following address:
Attention: North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh,NC 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Water Sciences Section no later than 30 days after the
end of the reporting period for which the report is made.
Test data shall be complete,accurate,include all supporting chemical/physical measurements and all
concentration/response data,and be certified by laboratory supervisor and ORC or approved designate signature.
Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for
disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is required,the
permittee will complete the information located at the top of the aquatic toxicity(AT)test form indicating the
facility name,permit number,pipe number,county,and the month/year of the report with the notation of"No
Page 18 of 28

Permit No.NC0005088
How"in the comment area of the form. The report shall be submitted to the Water Sciences Section at the address
cited above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required,monitoring will be
required during the following month.Assessment of toxicity compliance is based on the toxicity testing quarter,
which is the three month time interval that begins on the first day of the month in which toxicity testing is required
by this permit and continues until the final day of the third month.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division of Water
Resources indicate potential impacts to the receiving stream,this permit may be re-opened and modified to include
alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism
survival, minimum control organism reproduction, and appropriate environmental controls, shall constitute an
invalid test and will require immediate follow-up testing to be completed no later than the last day of the month
following the month of the initial monitoring.
A. (11.) CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY) (Outfall 005) [15A NCAC 02B .0400 et seq.,02B
.0500 et seq.]
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to
Ceriodaphnia dubia at an effluent concentration of 3.14 %.
The permit holder shall perform at a minimum,quarterly monitoring using test procedures outlined in the"North
Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure,"Revised December 2010,or subsequent versions or
"North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised-December 2010)or subsequent
versions.The tests will be performed during the months of March,June,September and December. These months
signify the first month of each three-month toxicity testing quarter assigned to the facility. Effluent sampling for
this testing must be obtained during representative effluent discharge and shall be performed at the NPDES
permitted final effluent discharge below all treatment processes.
If the test procedure performed as the first test of any single quarter results in a failure or ChV below the permit
limit,then multiple-concentration testing shall be performed at a minimum,in each of the two following
months as described in"North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised-
December 2010) or subsequent versions.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form(MR-1)for the months in which tests were performed,using the parameter code TGP3B for the
pass/fail results and THP3B for the Chronic Value. Additionally,DWR Form AT-3(original)is to be sent to the
following address:
Attention: North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh,NC 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Water Sciences Section no later than 30 days after the
end of the reporting period for which the report is made.
Test data shall be complete,accurate,include all supporting chemical/physical measurements and all
concentration/response data,and be certified by laboratory supervisor and ORC or approved designate signature.
Page 19 of 28

Permit No.NC0005088
Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for
disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is required,the
permittee will complete the information located at the top of the aquatic toxicity(AT)test form indicating the
facility name,permit number,pipe number,county,and the month/year of the report with the notation of"No
Flow"in the comment area of the form. The report shall be submitted to the Water Sciences Section at the address
cited above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required,monitoring will be
required during the following month.Assessment of toxicity compliance is based on the toxicity testing quarter,
which is the three month time interval that begins on the first day of the month in which toxicity testing is required
by this permit and continues until the final day of the third month.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division of Water
Resources indicate potential impacts to the receiving stream,this permit may be re-opened and modified to include
alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism
survival, minimum control organism reproduction, and appropriate environmental controls, shall constitute an
invalid test and will require immediate follow-up testing to be completed no later than the last day of the month
following the month of the initial monitoring.
A. (12.) ACUTE TOXICITY MONITORING-EPISODIC (Outfalls 002B,002C) [15A NCAC 02B .0400 et seq.,02B
.0500 et seq.]
The permittee shall conduct FIVE acute toxicity tests using protocols defined as definitive in E.P.A.Document
EPA/600/4-90/027 entitled"Methods for Measuring the Acute Toxicity of Effluents to Freshwater and Marine
Organisms."The monitoring shall be performed as a Fathead Minnow(Pimephales promelas)24 hour static test.
Effluent samples for self-monitoring purposes must be obtained below all waste treatment.Sampling and
subsequent testing will occur during the first five discrete discharge events after the effective date of this permit.
After monitoring of the first five toxicity tests,the permittee will conduct one test annually,with the annual period
beginning in January of the next calendar year.The annual test requirement must be performed and reported by
June 30.If no discharge occurs by June 30,notification will be made to the Division within 2 weeks after June 30.
Toxicity testing will be performed on the next discharge event for the annual test requirement.
The parameter code for this test is TAE6C.All toxicity testing results required as part of this permit condition will
be entered on the Effluent Discharge Form(MR-1)for the month in which it was performed,using the appropriate
parameter code.Additionally,DWQ Form AT-1 (original)is to be sent to the following address:
Attention: North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh,North Carolina 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Water Sciences Section no later than 30 days after the
end of the reporting period for which the report is made.
Page 20 of 28

Permit No.NC0005088
Test data shall be complete and accurate and include all supporting chemical/physical measurements performed in
association with the toxicity tests,as well as all dose/response data.Total residual chlorine of the effluent toxicity
sample must be measured and reported if chlorine is employed for disinfection of the waste stream.
Should any test data from either these monitoring requirements or tests performed by the North Carolina Division
of Water Resources indicate potential impacts to the receiving stream,this permit may be re-opened and modified
to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document,such as minimum control organism
survival and appropriate environmental controls,shall constitute an invalid test and will require immediate follow-
up testing to be completed no later than the last day of the month following the month of the initial monitoring.
A.(13.) INSTREAM MONITORING [15A NCAC 02B.0500 ET SEQ.]
The facility shall conduct monthly in-stream monitoring upstream at Alternate Route 221 and downstream at Hwy
150 for total arsenic, total selenium, total mercury, total chromium, dissolved lead, dissolved cadmium, dissolved
copper, dissolved zinc, total bromide, total hardness (as CaCO3), temperature, turbidity, and total dissolved solids
(TDS). The monitoring results shall be reported on the facility's Discharge Monitoring Reports and included with
the NPDES permit renewal application.
A. (14.)FISH TISSUE MONITORING NEAR ASH POND DISCHARGE[NCGS 143-215.3(a)(2)]
The facility shall conduct fish tissue monitoring annually and submit the results with the NPDES permit renewal
application.The objective of this monitoring is to evaluate potential uptake of pollutants by fish tissue near the ash
pond discharge. The parameters analyzed in fish tissue shall include arsenic,selenium,and mercury.The monitoring
shall be conducted in accordance with the sampling plan approved by the Division.The plan should be submitted to
the Division within 180 days from the effective date of the permit. Upon approval,the plan becomes an enforceable
part of the permit.
Copies of the plan and monitoring results shall be submitted to:
Electronic version(CD and PDF)and hard copy:
DWR Water Science Section
1623 Mail Service Center
Raleigh,NC 27699-1623
Electronic version only(CD and PDF):
WQ Permitting Section-NPDES
1617 Mail Service Center
Raleigh,NC 27699-1617Zka',''`�
A. (15.) CHEMICAL DISCHARGES[G.S.143-215,143-215.1]
Discharge of any product registered under the Federal Insecticide, Fungicide, and Rodenticide Act to any waste
stream which may ultimately be released to lakes,rivers,streams or other waters of the United States is prohibited
unless specifically authorized elsewhere in this permit. Discharge of chlorine from the use of chlorine gas,sodium
hypochlorite, or other similar chlorination compounds for disinfection in plant potable and service water systems
and in sewage treatment is authorized. Use of restricted use pesticides for lake management purposes by applicators
licensed by the N.C.Pesticide Board is allowed.
Page 21 of 28

Permit No.NC0005088
A. (16.) ADDITIONAL CONDITIONS AND DEFINITIONS [G.S.143-215.3(a)(2)&143-215.66]
1. EPA methods 200.7 or 200.8(or the most current versions)shall be used for analyses of all metals except for
total mercury(EPA Method 1631E).
2. All effluent samples for all external outfalls shall be taken at the most accessible location after the final
treatment but prior to discharge to waters of the U.S. (40 CFR 122.41(j)).
3. The term low volume waste sources means wastewater from all sources except those for which specific limitations
are otherwise established in this part(40 CFR 423.11 (b)).
4. The term chemical metal cleaning waste means any wastewater resulting from cleaning any metal process
equipment with chemical compounds,including,but not limited to,boiler tube cleaning(40 CFR 423.11 (c)).
5. The term metal cleaning waste means any wastewater resulting from cleaning[with or without chemical cleaning
compounds]any metal process equipment including,but not limited to,boiler tube cleaning,boiler fireside
cleaning,and air preheater cleaning(40 CFR 423.11 (d)).
6. For all outfalls where the flow measurement is to be"estimated" the estimate can be done by using calibrated
V-notch weir,stop-watch and graduated cylinder,or other method approved by the Division.
7. The term"FGD wet scrubber wastewater"means wastewater resulting from the use of the flue-gas
desulfurization wet scrubber.
8. There shall be no discharge of polychlorinated biphenyl compounds.
9. The permittee shall report the presence of cenospheres observed in any samples on the DMRs in the comment
section.
10. Thea applicant ispermitted to discharge chemical metal cleaningwastes to the ash pond.
Pp g
11. Nothing contained in this permit shall be construed as a waiver by the permittee of any right to a hearing it
may have pursuant to State or Federal laws and regulations.
A. (17.) STRUCTURAL INTEGRITY INSPECTIONS OF ASH DAMS [15A NCAC 02K.0208]
The facility shall meet the dam design and dam safety requirements per 15A NCAC 2K.
A. (18.) FLOATING MATERIALS [15A NCAC 02B.0400 et seq.]
The Permittee shall report all visible discharges of floating materials, such as an oil sheen, to the Director when
submitting DMRs.
A.(19.) INTAKE SCREEN BACKWASH[G.S. 143-215. 143-215.11
Continued intake screen backwash discharge is permitted without limitations or monitoring requirements.
A. (20.) BIOCIDE CONDITION [NCGS 143-215.11
The permittee shall not use any biocides except those approved in conjunction with the permit application. The
permittee shall notify the Director in writing not later than ninety(90)days prior to instituting use of any additional
biocide used in cooling systems which may be toxic to aquatic life other than those previously reported to the Division
of Water Resources. Such notification shall include completion of Biocide Worksheet Form 101 and a map locating
the discharge point and receiving stream. Completion of Biocide Worksheet Form 101 is not necessary for those
outfalls containing toxicity testing. Division approval is not necessary for the introduction of new biocides into
outfalls currently tested for whole effluent toxicity.
Page 22 of 28

Permit No.NC0005088
A. (21.) CHEMICAL METAL CLEANING WASTES [40 CFR 423]
It has been demonstrated that under certain conditions it is possible to reduce the concentration of metals in boiler
cleaning wastes in the range of 92 to 99+ percent by treatment in ash ponds. Because of dilution problems,and the
existence of boundary interface layers at the extremities of the plume, it is difficult to prove beyond doubt that the
quantity of iron and copper discharged will always be less than one milligram per liter times the flow of metal
cleaning when treated in this manner.
The application of physical/chemical methods of treating wastes has also been demonstrated to be effective in the
treatment of metal cleaning wastes. However, the effectiveness of ash pond treatment should be considered in
relation to the small differences in effluent quality realized between the two methods.
It has been demonstrated that the presence of ions of copper, iron, nickel, and zinc in the ash pond waters was not
measurably increased during the ash pond equivalency demonstration at the Duke Energy's Riverbend Steam
Station. Therefore, when the following conditions are implemented during metal cleaning procedures, effective
treatment for metals can be obtained at this facility:
1. Large ash basin providing potential reaction volumes in the ratio of 100 to 1.
2. Well-defined shallow ash delta near the ash basin influent.
3. Ash pond pH of no less than 6.5 prior to metal cleaning waste addition.
4. Four days retention time in ash pond with effluent virtually stopped.
5. Boiler volume less than 86,000 gallons.
6. Chemicals for cleaning to include only one or more of the following:
(a) Copper removal step- sodium bromate, NaBrO; ammonium carbonate, (NH)CO; and ammonium
hydroxide,NHOH.
(b) Iron removal step-hydrochloric acid, HC1; and ammonium bifluoride, (NH)BF and proprietary
inhibitors.
7. Maximum dilution of wastes before entering ash pond should not be greater than 6 to 1.
8. After treatment of metal cleaning wastes, if monitoring of basin effluents as required by the permit reveals
discharges outside the limits of the permit. permittee will re-close the basin discharge,conduct such in-basin
sampling as necessary to determine the cause of nonconformance, will take appropriate corrective actions,
and will file a report with EPA including all pertinent data.
A. (22.) TOXICITY REOPENER CONDITION [G.S. 143-215.1(b)]
This permit shall be modified, or revoked and reissued to incorporate toxicity limitations and monitoring
requirements in the event toxicity testing or other studies conducted on the effluent or receiving stream indicate that
detrimental effects may be expected in the receiving stream as a result of this discharge.
A. (23.) DOMESTIC WASTEWATER TREATMENT PLANT [G.S. 143-215,143-215.1]
The permittee shall at all times properly operate and maintain the domestic wastewater treatment plant to meet
secondary treatment standards.
A. (24.) CWA 316(b) REQUIREMENTS [40 CFR 125.95]
The permittee shall comply with the Cooling Water Intake Structure Rule per 40 CFR 125.95.The permittee shall
submit all the materials required by the Rule with the next renewal application.
Page 23 of 28

Permit No.NC0005088
Copies of all applicable materials should be submitted to:
Electronic version(CD and PDF)and hard copy:
DWR Water Science Section
1623 Mail Service Center
Raleigh,NC 27699-1623
Electronic version only(CD and PDF):
WQ Permitting Section-NPDES
1617 Mail Service Center
Raleigh,NC 27699-1617
A.(25.)APPLICABLE STATE LAW(State Enforceable Only) [NCGS 143-215.1(b)]
This facility shall meet the General Statute requirements under NCGS§130A-309.200 et seq.This permit may be
reopened to include new requirements imposed under these Statutes.
A. (26.) ASH POND CLOSURE
The facility shall prepare an Ash Ponds Closure Plan. This Plan shall be submitted to the Division one month prior
to the closure of the ash ponds.
A. (27.)TEMPERATURE MIXING ZONE-OUTFALL 005 [G.S. 143-215.3(a)(2)]
a)The temperature mixing zone is defined as the area extending from outfall 005 to approximately 145 meters(476
feet)downstream and 37 meters(121 feet)wide.The discharge shall not result in acute toxicity to aquatic life,
prevent free passage of aquatic organisms around the mixing zone,result in offensive conditions,produce
undesirable aquatic life or result in a dominance of nuisance species outside of the assigned mixing zone;or
endanger the public health or welfare.
b)The temperature standard of 32°C(89.6°F)and the maximum temperature increase above natural temperature of
2.8°C(5.04°F)shall be met at the end of the mixing zone. The natural water temperature shall be the temperature
measured at the upstream sampling location.The increase in temperature is defined as the difference in
temperature between the upstream and downstream sampling locations.
c)The results of all temperature monitoring shall be reported in the monthly DMRs. When possible,instream
monitoring for temperature shall be performed during times the facility is operating at full loading.
d)After 12 months of temperature data are collected the permittee shall submit a report to the Division to verify the
Cormix model predictions.The report shall include field verification of assumptions used in the model and a
summary of temperature data for effluent,upstream and downstream and shall be submitted to:
Division of Water Resources
WQ Permitting Section-NPDES
1617 Mail Service Center
Raleigh,NC 27699-1617
e)Once during the permit term the permittee shall perform an assessment to verify that the mixing zone does not
prevent the passage of aquatic organisms around the mixing zone.A study plan shall be submitted to the Division
prior to commencement of the study to the following address:
Page 24 of 28

Permit No.NC0005088
Division of Water Resources Division of Water Resources
WQ Permitting Section-NPDES Water Sciences Section
1617 Mail Service Center 1623 Mail Service Center
Raleigh,NC 27699-1617 Raleigh,NC 27699-1623
f)This permit may be reopened to implement alternative temperature limits or requirements based on the results of
the data collected.
A. (28.) ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS [G.S. 143-215.1(b)]
Federal regulations require electronic submittal of all discharge monitoring reports(DMRs)and program reports.
The final NPDES Electronic Reporting Rule was adopted and became effective on December 21,2015.
NOTE: This special condition supplements or supersedes the following sections within Part II of this permit
(Standard Conditions for NPDES Permits):
• Section B. (11.) Signatory Requirements
• Section D. (2.) Reporting
• Section D. (6.) Records Retention
• Section E. (5.) Monitoring Reports
1. Reporting Requirements [Supersedes Section D. (2.)and Section E. (5.) (a)l
The permittee shall report discharge monitoring data electronically using the NC DWR's Electronic Discharge
Monitoring Report(eDMR)internet application.
Monitoring results obtained during the previous month(s)shall be summarized for each month and submitted
electronically using eDMR. The eDMR system allows permitted facilities to enter monitoring data and submit
DMRs electronically using the internet. Until such time that the state's eDMR application is compliant with
EPA's Cross-Media Electronic Reporting Regulation(CROMERR),permittees will be required to submit all
discharge monitoring data to the state electronically using eDMR and will be required to complete the eDMR
submission by printing,signing,and submitting one signed original and a copy of the computer printed eDMR
to the following address:
NC DENR/ Division of Water Resources/ Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh,North Carolina 27699-1617
If a permittee is unable to use the eDMR system due to a demonstrated hardship or due to the facility being
physically located in an area where less than 10 percent of the households have broadband access,then a
temporary waiver from the NPDES electronic reporting requirements may be granted and discharge
monitoring data may be submitted on paper DMR forms(MR 1,1.1,2,3)or alternative forms approved by the
Director. Duplicate signed copies shall be submitted to the mailing address above. See"How to Request a
Waiver from Electronic Reporting" section below.
Regardless of the submission method,the first DMR is due on the last day of the month following the issuance
of the permit or in the case of a new facility,on the last day of the month following the commencement of
discharge.
Page 25 of 28

Permit No.NC0005088
Starting on December 21,2020,the permittee must electronically report the following compliance monitoring
data and reports,when applicable:
• Sewer Overflow/Bypass Event Reports;
• Pretreatment Program Annual Reports;and
• Clean Water Act(CWA)Section 316(b)Annual Reports.
The permittee may seek an electronic reporting waiver from the Division(see"How to Request a Waiver from
Electronic Reporting" section below).
2. Electronic Submissions
In accordance with 40 CFR 122.41(1)(9),the permittee must identify the initial recipient at the time of each
electronic submission. The permittee should use the EPA's website resources to identify the initial recipient for
the electronic submission.
Initial recipient of electronic NPDES information from NPDES-regulated facilities means the entity(EPA or the
state authorized by EPA to implement the NPDES program)that is the designated entity for receiving
electronic NPDES data[see 40 CFR 127.2(b)].
EPA plans to establish a website that will also link to the appropriate electronic reporting tool for each type of
electronic submission and for each state. Instructions on how to access and use the appropriate electronic
reporting tool will be available as well. Information on EPA's NPDES Electronic Reporting Rule is found at:
http://www2.epa.gov/compliance/final-national-pollu tant-discharge-elimination-system-npdes-electronic-
reporting-rule.
Electronic submissions must start by the dates listed in the"Reporting Requirements" section above.
3. How to Request a Waiver from Electronic Reporting
The permittee may seek a temporary electronic reporting waiver from the Division. To obtain an electronic
reporting waiver,a permittee must first submit an electronic reporting waiver request to the Division. Requests
for temporary electronic reporting waivers must be submitted in writing to the Division for written approval at
least sixty(60)days prior to the date the facility would be required under this permit to begin submitting
monitoring data and reports. The duration of a temporary waiver shall not exceed 5 years and shall thereupon
expire. At such time,monitoring data and reports shall be submitted electronically to the Division unless the
permittee re-applies for and is granted a new temporary electronic reporting waiver by the Division. Approved
electronic reporting waivers are not transferrable. Only permittees with an approved reporting waiver request
may submit monitoring data and reports on paper to the Division for the period that the approved reporting
waiver request is effective.
Information on eDMR and the application for a temporary electronic reporting waiver are found on the
following web page:
http://deq.nc.gov/about/divisions/water-resources/edmr
Page 26 of 28

Permit No.NC0005088
4. Signatory Requirements[Supplements Section B. (11.) (b)and Supersedes Section B.(11.) (d)l
All eDMRs submitted to the permit issuing authority shall be signed by a person described in Part H,Section B.
(11.)(a)or by a duly authorized representative of that person as described in Part II,Section B.(11.)(b). A
person,and not a position,must be delegated signatory authority for eDMR reporting purposes.
For eDMR submissions,the person signing and submitting the DMR must obtain an eDMR user account and
login credentials to access the eDMR system. For more information on North Carolina's eDMR system,
registering for eDMR and obtaining an eDMR user account,please visit the following web page:
http://deq.nc.gov/about/divisions/water-resources/edmr
Certification. Any person submitting an electronic DMR using the state's eDMR system shall make the
following certification[40 CFR 122.221 NO OTHER STATEMENTS OF CERTIFICATION WILL BE
ACCEPTED:
"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."
5. Records Retention[Supplements Section D. (6.)1
The permittee shall retain records of all Discharge Monitoring Reports,including eDMR submissions. These
records or copies shall be maintained for a period of at least 3 years from the date of the report. This period
may be extended by request of the Director at any time[40 CFR 122.41].
A. (29.) NOTIFICATION OF START-UP-OUTFALL 005 [G.S.143-215.1(a)]
The permittee shall notify the Asheville Regional Office and the NPDES Permitting Unit in writing,seven(7)
calendar days prior to the commencement of the discharge from the new waste water treatment system(Outfall
005).In addition,the pemittee shall notify if the decanting and/or dewatering of the ash basin will be routed to the
new treatment system.Notification shall be sent to the following addresses:
Division of Water Resources Division of Water Resources
WQ Permitting Section-NPDES Asheville Water Quality Regional Operations Section
1617 Mail Service Center 2090 U.S.70 Highway
Raleigh,NC 27699-1617 Swannanoa,NC 28778-8211
A.(30)COMPLIANCE BOUNDARY [15A NCAC 02L.0107]
The compliance boundary for the disposal system shall be specified in accordance with 15A NCAC 02L.0107(a)or
(b)dependent upon the date permitted. An exceedance of groundwater standards at or beyond the compliance
boundary is subject to remediation action according to 15A NCAC 02L.0106(c),(d),or(e)as well as enforcement
actions in accordance with North Carolina General Statute 143-215.6A through 143-215.6C.The compliance
boundary map for this facility is incorporated herein and attached hereto as Attachment A.
•
Page 27 of 28

Permit No.NC0005088
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106 35° 13'6.3" 81°44'53.7"
Page 28 of 28
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