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Home My WebLink AboutNC0004979_20180418_Draft Permit ROY COOPER IN C Governor MICHAEL S.REGAN Secretary Water Resources LINDA CULPEPPER Environmental Quality Intenm Director April 18,2018 Mr. Paul Draovitch, Senior Vice President Environmental, Health and Safety Duke Energy Carolinas,LLC Mail Code EC13K P.O. Box 1006 Charlotte,North Carolina 28201-1006 Subject: Draft NPDES Permit Permit NC0004979 Allen Steam Station Gaston County Facility Class I Dear Mr. Draovitch: Enclosed with this letter is a copy of the draft major modification for your facility. Please review the draft very carefully to ensure thorough understanding of the conditions and requirements it contains. The draft permit contains the following significant changes from your current permit: • The Toe Drains Outfalls 103, 104, 108,and 108B (Please see A. (12.),A. (13.),A. (14.), and A. (15.)) were added to the permit. • The turbidity limit was added to the permit (Outfall 002) to meet the state turbidity standard per 15A NCAC 2B .0211(3) (k). • The pH limits were added to the permit (Outfalls 002A and 002B) to meet the state pH standard per 15A NCAC 2B .0200. • The Technology Based Effluent Limits for Total Arsenic,Total Mercury,Total Selenium, and Nitrate/nitrite as N were added to the permit (Outfall 005) and are based on the requirements of 40 CFR 123. • Monitoring for Chlorides was removed from the permit (Outfall 002) based on the results of Reasonable Potential Analysis. • Monitoring for COD,Total Cadmium,Total Chromium, Chlorides,Total Nickel,Total Silver,Total Zinc and Total Beryllium was removed from the permit (Internal Outfall 005) based on the results of the discharge evaluation. • 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. The requirement to begin reporting discharge Nothing Compares - State of North Carolina I Environmental Quality 1611 Mail Service Center I Raleigh,North Carolina 27699-1611 919-707-9000 monitoring data electronically using the NC DWR's Electronic Discharge Monitoring Report (eDMR) Internet application has been added to your final NPDES permit. [See Special Condition A. (26)] For information on eDMR,registering for eDMR and obtaining an eDMR user account, please visit the following web page: http•//deq nc.gov/about/divisions/water- resources/edmr. For more information on EPA's final NPDES Electronic Reporting Rule,please visit the following web site: https•//www federalregister.gov/documents/2015/10/22/2015- 24954/national-pollutant-discharge-ehmination-system-npdes-electronic-reporting-rule • The Applicable State Law Special Condition was added to the permit to meet the requirements of Senate Bill 729 (Coal Ash Management Act,please see Special Condition A. (27.)). • The Additional Conditions and Definitions Special Condition was added to the permit.Please see Special Condition A. (19). • Monitoring for Bromide was added to the Outfall 002 and the Instream Monitoring Special Condition(Please see A. (24.))to address the comment from the Public Water Supply Section. • Monitoring for Hardness was added to Outfall 002 and the Instream Monitoring Special Condition A. (24.) to assist in implementation of the new dissolved standards. • The Outfall 006 was added to the permit to accommodate a future retention basin discharge. • The IWC for the Whole Effluent Toxicity Test (Outfall 002) was increased to 23.6% based on the new flow data. • The monitoring frequency for the Whole Effluent Toxicity was increased to Monthly(Outfall 002-dewatering) to address the EPA comment. • The monitoring frequency for the Total Arsenic, Total Selenium, and Total Mercury was increased to Weekly (Outfall 002 - dewatering) to address the EPA comment • The monitoring frequency for the Total Arsenic, Total Selenium, Total Mercury, and Nitrate/nitrite was reduced to Quarterly based on the evaluation of the effluent data(Internal Outfall 005). • The daily maximum limit for TSS was reduced to 50 0 mg/L (Outfall 002) to meet the requirements of 40 CFR 423. • The Decanting and Dewatering Special Conditions in the footnotes were added to Outfall 002,please see A. (2.) and A. (3). • The Outfall 008 was added to the permit to accommodate discharge from the emergency spillway of the retired Ash Pond. • The total silver limits were added to the permit (Outfall 002) based on the results of the Reasonable Potential Analysis. • The groundwater compliance boundary map was added to the permit • The Compliance Boundary special condition was added to the permit,please see A. (28.). Please provide any comments you have regarding the draft permit to this office by May 18, 2018. At this time, the Division is also publishing a notice in the newspapers of general circulation in Gaston County,inviting public comment on the draft major modification. Following the 30-day comment period,we will review all pertinent comments received and take appropriate action on the permit renewal. The NPDES Standard Conditions (Parts II, III, and IV) are not included with this draft. They can be found at the following link if you would like to review them in conjunction with this draft permit. http://ncdenr.s3 amazonaws.com/s3fs- pubhc/Water%20Quahty/Surface%20Water%20Protection/NPDES/MISC/NPDES%20Standard %20Conditions-B oilerplate-DWR-SWP-NPDES-20150410.pdf If you have any questions about the NPDES permit process,please contact me at the following e- mail address• sergei.chernikovancdenr.gov, or telephone number: 919-807-6386. Sincerely, c 5-) Sergei Chernikov,Ph.D. Environmental Engineer II Complex NPDES Permitting Unit cc. NPDES Files EPA Region IV(e-copy) Mooresvile Regional Office/ Surface Water Protection (e-copy) Mooresvile Regional Office /Public Water Supply(e-copy) Aquatic Toxicology Unit(e-copy) TACU (e-copy) Permit NC0004979 STA 1'E OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENTAL QUALITY DIVISION OF WATER RESOURCES Draft PERMIT TO DISCHARGE WASTEWATER UNDER THE NATIONAL POLLUTANT DISCHARGE ELIMINATION SYS 1'EM In compliance with the provision 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 the Allen Steam Station 253 Plant Allen Road (NCSR 2525) Belmont Gaston County to receiving waters designated as the Catawba River (Lake Wylie),unnamed tributary to the Catawba River,and South Fork Catawba River in the Catawba River Basin in accordance with effluent limitations,monitoring requirements,and other applicable conditions set forth in Parts I,II,and III This permit shall become effective This permit and authorization to discharge shall expire at midnight on Signed this day DRAFT Linda Culpepper,Interim Director Division of Water Resources By Authority of the Environmental Management Commission Page 1 of 25 Permit NC0004979 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 discharge. • Outfall 001• once through cooling water. • Outfall 002:Ash Basin discharge.This outfall includes domestic wastewater,stormwater from the coal pile area,miscellaneous stormwater flows,ash sluice,wastewater from turbine non-destructive testing,landfill leachate,FGD blowdown,yard drain sump,water treatment filter backwash,treated groundwater,laboratory wastes,and the power house sump at Unit 5 The domestic waste is pre- treated by a septic tank Outfall 002 wastewater is treated using chemical coagulation, settling,and pH neutralization. Outfall 002 and Outfall 006 might be operational at the same time during the transition period • Outfall 002A coal yard sump overflow(discharge from coal handling and storage areas). • Outfall 002B. power house sump overflow(floor wash water,boiler blowdown,water treatment waste, condensates, equipment cooling water,sealing water and miscellaneous leakage). • Outfall 003. miscellaneous equipment non-contact cooling and sealing water. • Outfall 004• miscellaneous non-contact cooling water,vehicle washwater,and intake screen backwash. • Outfall 006 Upon completion of construction of the Retention Basin,discharge domestic wastewater,stormwater from the coal pile area,miscellaneous stormwater flows,ash sluice, wastewater from turbine non-destructive testing,landfill leachate,FGD blowdown,yard drain sump,water treatment filter backwash, treated groundwater,laboratory wastes,and the power house sump at Unit 5. The domestic waste is pre-treated by a septic tank. Outfall 006 wastewater is treated using chemical coagulation, settling,and pH neutralization Outfall 002 and Outfall 006 might be operational at the same time during the transition period. • Outfall 007. the emergency spillway of the new Retention Basin The spillway is designed for a flood greater than 100-year event. Sampling of this spillway is waived due to unsafe conditions associated with sampling during an overflow event • Outfall 008. the emergency spillway of the retired Ash Pond The spillway is designed for a flood greater than 100-year event Sampling of this spillway is waived due to unsafe conditions associated with sampling during an overflow event • Toe Drawn Outfalls 103 (lat.-35°10.512',long -81°0 360'), 104(lat. - 35°10.541';long - 8100 364'), 108 (lat. -35°10.710';long-8100.384'),and 108B (lat -35°10.689',long- 81°0.391')•4 potentially contaminated toe drains From a facihty located at the Plant Allen Steam Station on Plant Allen Road(NCSR 2525), south of Belmont in Gaston County,and 2 Without adding detergents or chemicals of any kind,discharge Asiatic clam/debris filter backwash from the intake filter screen,in accordance with condition A (10.),and 3 Continue to operate a Flue Gas Desulfurization (FGD)wet scrubber wastewater treatment system discharging to the Ash Basin through Internal Outfall 005;consisting of. • A flow equalization tank and a maintenance tank • Feed systems for lime, sulfide,iron addition,polymer,hydrochloric acid,and nutrient addition • Two clarifiers • Dual heat exchangers • Selenium reduction bioreactors Page 2 of 25 Permit NC0004979 • A sludge treatment system including three filter presses;and 4 Discharge from said treatment works at the location specified on the attached map into the Catawba River classified as WS-IV B (outfalls 002,002A,002B,004,006,008, 103, 108,and 108B),the unnamed tributary to Catawba River classified as WS-IV B (Outfall 104),and the South Fork Catawba River classified as WS-V (outfalls 001 and 003),in the Catawba River Basin. Page 3 of 25 Permit NC0004979 Part I A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 001) [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 001- Condenser Cooling Water(CCW) Such discharges shall be limited and monitored2 by the Permittee as specified below: EFFLUENT LIMITS MONITORING REQUIREMENTS CHARACTERISTICS Monthly Daily Measurement Sample Type Sample Location Average Max. Frequency Flow,MGD Daily Pump Logs Effluent Temperature 38 9°C DailyGrab or Effluent (rune 1 —September 30)1 (102°F) Instantaneous Temperature 35°C DailyGrab or Effluent (October 1 —May 31)1 (95°F) Instantaneous Notes: 1 Based upon studies conducted by the permittee and submitted to the Division,it has been determined pursuant to Section 316(a) of the Clean Water Act that the thermal component of the discharge assures the protection and propagation of a balanced,indigenous population of shellfish, fish and wildlife in the receiving water body 2. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application system Please See Special Condition A (26.) Chlorination of the once through condenser cooling water,discharged through outfall 001,is not allowed under this permit. Should Duke Energy Carolinas,LLC wish to chlorinate its condenser cooling water, a permit modification must be obtained beforehand. Page 4 of 25 Permit NC0004979 A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 002-normal operation/decanting) [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 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 monitored4 by the Permittee as specified below: EFFLUENT LIMITS MONITORING REQUIREMENTS CHARACTERISTICS Monthly Daily Measurement Sample Type Sample Average Maximum Frequency Location Flow,MGD Weekly Instantaneous Influent or or Estimate Effluent Oil and Grease 15.0 mg/L 20.0 mg/L Monthly Grab Effluent Total Suspended Sohds8 30.0 mg/L 50 0 mg/L Monthly Grab Effluent Total Copper 1 1.0 mg/L 1.0 mg/L Monthly Grab Effluent Total Iron 1 1.0 mg/L 1 0 mg/L Monthly Grab Effluent BOD,5-day,20°C6 30 0 mg/L 45.0 mg/L Monthly Grab Effluent Fecal Coliform(geo mean)6 200/100 mL 400/100 mL Monthly Grab Effluent Total Selenium,µg/L Monthly Grab Effluent Total Arsenic,µg/L Monthly Grab Effluent Total Silver 0.255 µg/L 1 081 µg/L Monthly Grab Effluent Total Mercury 2,ng/L Monthly Grab Effluent Total Nitrogen (NO2+NO3 +TKN),mg/L Quarterly Grab Effluent Total Phosphorus,mg/L Quarterly Grab Effluent Chronic Toxicity 3 Quarterly Grab Effluent Total Hardness,mg/L Monthly Grab Effluent Turbidntys,NTU Monthly Grab Effluent Bromide,mg/L Monthly Grab Effluent pHA Between 6 0 and 9 0 standard Monthly Grab Effluent units Footnotes. 1. The limits for total copper and total iron only apply when chemical metal cleaning wastewaters are being discharged. 2 Mercury shall be measured using EPA Method 1631E 3 Whole Effluent Toxicity shall be monitored by chronic toxicity(Cenodaphnia)P/F at 23.6%,see Special Condition A. (17). 4. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application system. Please See Special Condition A. (26) 5 The discharge from this facility shall not cause turbidity in the receiving stream to exceed 50 NTU If the mstream 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 Page 5 of 25 Permit NC0004979 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. 6 The limit and monitoring apply only when the domestic wastewater is being discharged to the basin. 7 The facility shall continuously monitor pH when the decanting process commences (and the pump is operating) and the decanting pump shall be shutoff automatically when the 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.The continuous pH monitoring is only required when the pumps are employed for decanting. 8. The facility shall continuously monitor TSS concentration when the decanting process commences (and the pump is operating) and the decanting pump shall be shutoff 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.The continuous TSS monitoring is only required when the pumps are employed for decanting. There shall be no discharge of floating solids or visible foam in other than trace amounts. The facility is allowed to drawdown the wastewater in the ash pond to no less than three feet above the ash. 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. The facility shall use a floating pump suction pipe with free water skimmed from the basin surface using an adjustable weir. Lowering the level below the three feet mark triggers the limits and conditions in Section A. (3.) of the permit. By November 1,2018 there shall be no discharge of pollutants in fly ash transport water.This requirement only applies to fly ash transport water generated after November 1,2018. By December 31,2023 there shall be no discharge of pollutants in bottom ash transport water.This requirement only applies to bottom ash transport water generated after December 31,2023. In accordance with the 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"). This requirement only applies to bottom ash transport water generated after 12/31/2019 or a new date as HB630 may be amended. The facility shall notify via e-mail DWR Complex NPDES Permitting Unit and DWR Mooresville Regional Office,in writing,seven calendar days prior to the commencement of the decanting. When the facility commences the ash pond/ponds decanting,the facility shall treat the wastewater discharged from the ash pond/ponds 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 Mooresville Regional Office,in writing,within seven calendar days of installing additional physical-chemical treatment at this Outfall. Page 6 of 25 Permit NC0004979 A. (3.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 002-dewatering) [15A NCAC 02B .0400 et seq.,02B .0500 et seq] During the period beginning on the commencement of dewatering and lasting until expiration, the Permittee is authorized to discharge from outfall 002—ash pond effluent (dewatering-removing the interstitial water) Such discharges shall be limited and monitored4 by the Permittee as specified below. EFFLUENT LIMITS MONITORING REQUIREMENTS CHARACTERISTICS Monthly Daily Measurement Sample Type Sample Average Maximum Frequency Location Instantaneous Influent or Flow,MGD 1.09 Daily or Estimate Effluent Oil and Grease 15 0 mg/L 20.0 mg/L Weekly Grab Effluent Total Suspended Solids6 30 0 mg/L 50.0 mg/L Weekly Grab Effluent Total Copper 1 1 0 mg/L 10 mg/L Weekly Grab Effluent Total Iron 1 1 0 mg/L 10 mg/L Weekly Grab Effluent BOD,5-day,20°C 7 30 0 mg/L 45 0 mg/L Weekly Grab Effluent Fecal Coliform(geo mean)7 200/100 mL 400/100 mL Weekly Grab Effluent Total Selenium,µg/L Weekly Grab Effluent Total Arsenic,µg/L Weekly Grab Effluent Total Silver 3 74µg/L 15.13µg/L Weekly Grab Effluent Total Mercury 2,ng/L Weekly Grab Effluent Total Nitrogen (NO2+NO3 +TKN),mg/L Weekly Grab Effluent Total Phosphorus,mg/L Weekly Grab Effluent Chronic Toxicity 3 Monthly Grab Effluent Total Hardness,mg/L Weekly Grab Effluent Turbidity5,NTU Weekly Grab Effluent Bromide,mg/L Weekly Grab Effluent Total Chromium,µg/L Weekly Grab Effluent Total Lead,µg/L Weekly Grab Effluent Total Cadmium,µg/L Weekly Grab Effluent Total Zinc,µg/L Weekly Grab Effluent IDS,mg/L Weekly Grab Effluent Between 6 0 and 9 0 standard Grab Weekly pHs Effluent units Footnotes 1 The limits for total copper and total iron only apply when chemical metal cleaning wastewaters are being discharged 2. Mercury shall be measured using EPA Method 1631E. 3 Whole Effluent Toxicity shall be monitored by chronic toxicity (Ceriodaphnia)P/F at 1 6%,see Special Condition A. (17) 4 The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application system. Please See Special Condition A. (26.). Page 7 of 25 Permit NC0004979 5 The discharge from this facility shall not cause turbidity in the receiving stream to exceed 50 NTU. If the mstream 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 6 The facility shall continuously monitor TSS concentration when the dewatering process commences (and the pump is operating) and the dewatering pump shall be shutoff 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.The continuous TSS monitoring is only required when the pumps are employed for dewatering 7 The limit and monitoring apply only when the domestic wastewater is being discharged to the basin 8 The facility shall continuously monitor pH when the dewatering process commences (and the pump is operating) and the dewatering pump shall be shutoff automatically when the 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.The continuous pH monitoring is only required when the pumps are employed for dewatering. 9 The limit applies only when pumping is used for dewatering. There shall be no discharge of floating solids or visible foam in other than trace amounts. 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. The facility shall use a floating pump suction pipe with free water skimmed from the basin surface using an adjustable weir. By November 1,2018 there shall be no discharge of pollutants in fly ash transport water.This requirement only applies to fly ash transport water generated after November 1,2018. By December 31,2023 there shall be no discharge of pollutants in bottom ash transport water.This requirement only applies to bottom ash transport water generated after December 31,2023. In accordance with the 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"). This requirement only applies to bottom ash transport water generated after 12/31/2019 or a new date as HB630 may be amended. The facility shall notify DWR Complex NPDES Permitting Unit and DWR Mooresville Regional Office seven calendar days,in writing,prior to the commencement of the dewatering. When the facility commences the ash pond/ponds dewatering,the facility shall treat the wastewater discharged from the ash pond/ponds 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 Mooresville Regional Office,in writing,within seven calendar days of installing additional physical-chemical treatment at this Outfall. Page 8 of 25 Permit NC0004979 A. (4.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 002A) [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 002A—Coal Yard Sump Overflows. Such discharges shall be limited and monitored2 by the Permittee as specified below: EFFLUENT LIMITS MONITORING REQUIREMENTS CHARACTERISTICS Monthly Daily Measurement Sample Sample Location1 Average Maximum Frequency Type Flow,MGD Per discharge event Estimate Effluent pH Between 6 Olandd 9 0 standard Per discharge event Grab Effluent ts Oil and Grease 15.0 mg/L 20.0 mg/L Per discharge event Grab Effluent Total Suspended Solids 30.0 mg/L 50.0 mg/L Per discharge event Grab Effluent BOD,5-day,20°C4 30.0 mg/L 45.0 mg/L Per discharge event Grab Effluent Fecal Coliform(geo. 200/100 mL 400/100 mL Per discharge event Grab Effluent mean)4 Total Copper3 1.0 mg/L 1.0 mg/L Per discharge event Grab Effluent Total Iron3 1.0 mg/L 1 0 mg/L Per discharge event Grab Effluent Footnotes: 1. Effluent sampling shall be conducted at a point upstream of discharge to the receiving stream. 2. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application system Please See Special Condition A. (26). 3. The limits for total copper and total iron only apply when chemical metal cleaning wastewaters are being discharged. 4. The limit and monitoring apply only when the domestic wastewater is being discharged to the basin. There shall be no discharge of floating solids or visible foam in other than trace amounts. All flows shall be reported on monthly DMRs. If no flow occurs during a given month,the words "no flow"should be clearly written on the front of the DMR. All samples shall be of a representative discharge. Page 9 of 25 Permit NC0004979 A. (5.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 002B) [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 002B—Power House Sump Overflows. Such discharges shall be limited and monitored3 by the Permittee as specified below: EFFLUENT LIMITS MONITORING REQUIREMENTS CHARACTERISTICS Monthly Daily Measurement Sample Type Sample Average Maximum Frequency Locations Flow,MGD Per discharge Estimate Effluent event Between 6 0 and 9 0 standard Per discharge pH units event Grab Effluent Oil and Grease 15.0 mg/L 20.0 mg/L Per discharge Grab Effluent event Total Suspended Solids 30.0 mg/L 100.0 mg/L Per discharge Grab Effluent event Total Copper2 10 mg/L 10 mg/L Per discharge Grab Effluent event Total Iron 1 0 mg/L 1 Omg/L Per discharge Grab Effluent event Footnotes 1. Effluent sampling shall be conducted at a point upstream of discharge to the receiving stream 2 The limits for total copper and total iron only apply when chemical metal cleaning wastewaters are being discharged 3. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application system Please See Special Condition A. (26) There shall be no discharge of floating solids or visible foam in other than trace amounts. All flows shall be reported on monthly DMRs. If no flow occurs during a given month,the words "no flow"should be clearly written on the front of the DMR. All samples shall be of a representative discharge. Page 10 of 25 Permit NC0004979 A. (6.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 003) [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 003—miscellaneous equipment non-contact water and sealing water Such discharges shall be limited and monitoredi by the Permittee as specified below: EFFLUENT LIMITS MONITORING REQUIREMENTS CHARACTERISTICS Monthly Daily Measurement Sample Type Sample Location Average Maximum Frequency Flow,MGD Weekly Estimate Effluent Footnotes: 1. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application system. Please See Special Condition A. (26.). Chlorination of the once through cooling water,discharged through outfall 003,is not allowed under this permit. If Duke Energy Carolinas,LLC wishes to chlorinate this once through cooling water,a permit modification must be obtained beforehand. A. (7.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 004) [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 004-miscellaneous non-contact cooling water,vehicle washwater,and intake screen backwash. Such discharges shall be limited and monitored) by the Permittee as specified below EFFLUENT LIMITS MONITORING REQUIREMENTS CHARACTERISTICS Monthly Daily Measurement Sample Type Sample Average Maximum Frequency Location Flow,MGD Weekly Estimate Effluent • Oil and Grease 15.0 mg/L 20.0 mg/L Quarterly Grab Effluent Footnotes: 1. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application system. Please See Special Condition A. (26.) Chlorination of the once through cooling water,discharged through outfall 004,is not allowed under this permit. If Duke Energy Carolinas,LLC wishes to chlorinate this once through cooling water,a permit modification must be obtained beforehand. Page 11 of 25 Permit NC0004979 A. (8.) EFFLUENT LIMITATIONS IND MONITORING REQUIREMENTS (Internal Outfall 005) [15A NCAC 02B 0400 et seq.,02B 0506 et seq.] During the period beginning on the effechve date of this permit and lasting until permit expiration, the Permittee is authorized to discharge from internal outfall 005-treated FGD wet scrubber wastewater to ash settling basin. Such discharges shall be limited and monitored2 by the Permittee as specified below. EFFLUENT I LIMITS MONITORING REQUIREMENTS CHARACTERISTICS Monthly Daily Measurement Sample Sample Average Maximum Frequency Type Locations Pump logs or Flow,MGD Monitor&Report Monthly similar Effluent 1 readings Total Arsenic 8 0µg%L4 11 0 ig/L4 Quarterly Grab Effluent Total Mercury3,ng/L 356.0 n4/L4 788 0 ng/L4 Quarterly Grab Effluent Total Selenium 12.0 µgr/L4 23.0 ii.g/L4 Quarterly Grab Effluent Nitrate/nitrite as N 4 4 mg4,4 17.0 mg/L4 Quarterly Grab Effluent pH Monthly Grab Effluent Footnotes: 1 "Effluent"shall be defined as the disci\Lrge from the FGD wastewater treatment system prior to commingling with other waste streams. 2 The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application system. Please See Special Condition A. (26.). 3 The facility shall use method 1631E. 4. Beginning on December 31, 2023, tl�e pettnittee will comply with the Steam Electric Effluent Limitations Guidelines for FGD wastewater (40 C.F.R. 423) in effect on December 1,2020. Only monitoring is required until December 31, 2023. This permit shall be reopened and mo i fied to reflect any changes in the 40 CFR 423. All flows shall be reported on monthly DMRs. If no flow occurs during a given month, the words "no flow"shall be clearly written on the front df the DMR. All samples shall be of a representative discharge. The facility shall operate the FGD treatme t system until all coal-fired units are retired. Page 12 of 25 Permit NC0004979 A. (9.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 006) [15A NCAC 02B .0400 et seq.,02B .0500 et seq] During the period beginning upon commencement of operations and lasting until expiration,the Permittee is authorized to discharge from outfall 006—Retention Basin discharge. Such discharges shall be limited and monitoredi by the Permittee as specified below. EFFLUENT DISCHARGE LIMITATIONS MONITORING REQUIREMENTS CHARACTERISTICS Monthly Daily Measurement Sample Sample Average Maximum Frequency Type Location Flow,MGD Weekly Instantaneous Effluent or Estimate pH Between 6.0 and 9 0 standard Monthly Grab Effluent units TSS 30 0 mg/L 100 0 mg/L Monthly Grab Effluent Oil and Grease . 15.0 mg/L 20.0 mg/L Monthly Grab Effluent BOD,5-day,20°C5 30 0 mg/L 45.0 mg/L Monthly Grab Effluent Fecal Coliform(geo mean)5 200/100 mL 400/100 mL Monthly Grab Effluent Fluoride,mg/L Monthly Grab Effluent Total Mercury2,ng/L Monthly Grab Effluent Total Silver 1.17µg/L 4.79µg/L Monthly Grab Effluent Total Iron3 1.0 mg/L 1.0 mg/L Monthly Grab Effluent Total Zinc,µg/L Monthly Grab Effluent Total Arsenic,µg/L Monthly Grab Effluent Total Cadmium,µg/L Monthly Grab Effluent Total Chromium,µg/L Monthly Grab Effluent Total Copper3 10 mg/L 10 mg/L Monthly Grab Effluent Total Lead,µg/L Monthly Grab Effluent Total Nickel,µg/L Monthly Grab Effluent Total Selenium,µg/L Monthly Grab Effluent Total Nitrogen Quarterly Grab Effluent (NO2+NO3 +TKN),mg/L Total Phosphorus,mg/L Quarterly Grab Effluent Sulfates,mg/L Monthly Grab Effluent Chlorides,mg/L Monthly Grab Effluent Bromide,mg/L Monthly Grab Effluent TDS,mg/L Monthly Grab Effluent Total Hardness,mg/L Monthly Grab Effluent Temperature,0C Monthly Grab Effluent Conductivity,µmho/cm Monthly Grab Effluent Chronic Toxicity4 Monthly Grab Effluent Footnotes. 1. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application system. Please See Special Condition A. (26). 2. The facility shall use EPA method 1631E. 3. The limits for total copper and total iron only apply when chemical metal cleaning wastewaters are being discharged. 4. Whole Effluent Toxicity shall be monitored by chronic toxicity(Ceriodaphnia)P/F at 5.1%,see Special Condition A (17.). 5. The limit and monitoring apply only when the domestic wastewater is being discharged to the basin. There shall be no discharge of floating solids or visible foam in other than trace amounts. Page 13 of 25 Permit NC0004979 The facility shall submit EPA Form 2C for Outfall 006 no later than 180 days from the commencement of the discharge.The facility shall notify DWR/NPDES,in writing,30 days prior to the commencement of the discharge from this outfall. A. (10.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 007) [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 007—Emergency spillway of the new Retention Basin.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 Frequency Type Location Flow,MGD Waived Estimate Effluent pH Waived Grab Effluent TSS Waived Grab Effluent Oil and Grease Waived Grab Effluent The emergency spillway is designed for a flood greater than 100-year event in Gaston County. Sampling of this spillway is waived due to unsafe conditions associated with sampling during an overflow event. Monitoring is required for any other rain event that might trigger a discharge. A. (11.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 008) [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 008—Emergency spillway of the retired ash basin. 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 Frequency Type Location Flow,MGD Waived Estimate Effluent pH Waived Grab Effluent TSS Waived Grab Effluent Oil and Grease Waived Grab Effluent The emergency spillway is designed for a flood greater than 100-year event in Gaston County. Sampling of this spillway is waived due to unsafe conditions associated with sampling during an overflow event. Monitoring is required for any other rain event that might trigger a discharge. Page 14 of 25 Permit NC0004979 A. (12.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 103) [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 103—Toe Drain Discharge 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 pH3 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,mg/L Monthly/Quarterly Grab Effluent Total Mercury4,ng/L Monthly/Quarterly Grab Effluent Total Barium,mg/L Monthly/Quarterly Grab Effluent Total Iron,mg/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 as N,mg/L Monthly/Quarterly Grab Effluent Sulfates,mg/L Monthly/Quarterly Grab Effluent Chlorides,mg/L Monthly/Quarterly Grab Effluent 11.)S,mg/L Monthly/Quarterly Grab Effluent Total Hardness,mg/L Monthly/Quarterly Grab Effluent Temperature,0C Monthly/Quarterly Grab Effluent Conductivity,µmho/cm Monthly/Quarterly Grab Effluent Footnotes. 1. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application system. Please See Special Condition A. (26) 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 pH shall not be less than 6 0 standard units nor greater than 9 0 standard units 4 The facility shall use EPA method 1631E 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 toe drain,the Permittee shall submit its DMR, as required, and indicate "No Flow"for the toe drain (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 25 II I Permit NC0004979 I A. (13.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 104) [15A NCAC 02B 0400 et seq,02B .050011 et seq] 1 During the period beginning on the effective date of this permit and lasting until expiration, the Permittee is authorized to discharge from outfall 104 Toe Drain Discharge. 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 pH3 1 Monthly/Quarterly Grab Effluent TSS 30 0 mg/li, 100 0 mg/L Monthly/Quarterly Grab Effluent Oil and Grease 15 0 mg/4 20 0 mg/L Monthly/Quarterly Grab Effluent Fluoride,mg/L Monthly/Quarterly Grab Effluent Total Mercury4,ng/L 1 Monthly/Quarterly Grab Effluent Total Barium,mg/L Monthly/Quarterly Grab Effluent Total Iron,mg/L 1 Monthly/Quarterly Grab Effluent Total Manganese,µg/L 1 Monthly/Quarterly Grab Effluent Total Zinc,µg/L i Monthly/Quarterly Grab Effluent Total Arsenic, µg/L Monthly/Quarterly Grab Effluent Total Cadmium,µg/L 1 Monthly/Quarterly Grab Effluent Total Chromium,µg/L Monthly/Quarterly Grab Effluent Total Copper,pg/L Monthly/Quarterly Grab Effluent Total Lead,µg/L Monthly/Quarterly Grab Effluent Total Nickel,µg/L 1 Monthly/Quarterly Grab Effluent Total Selenium,µg/L 1 Monthly/Quarterly Grab Effluent Nitrate as N,mg/L 1 Monthly/Quarterly Grab Effluent Sulfates,mg/L 1 Monthly/Quarterly Grab Effluent Chlorides,mg/L 1 Monthly/Quarterly Grab Effluent IDS,mg/L I Monthly/Quarterly Grab Effluent Total Hardness,mg/L , Monthly/Quarterly Grab Effluent Temperature,0C Monthly/Quarterly Grab Effluent Conductivity,µmho/cm Monthly/Quarterly Grab Effluent Footnotes 1 The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application system. Please See Special Condition A 1(26). 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 pH shall not be less than 6 0 standard units nor greater than 9.0 standard units. 4. The facility shall use EPA method 1631E\ If no discharge occurs during the reportin period or the Permittee is unable to obtain a representative sample due to low-flow conditions at the toe drain, the Permittee shall submit its DMR, as required,and indicate "No Flow"for the toe drain(15A CAC 02B .0506(a)(1)(E)). There shall be no discharge of floating soli s or visible foam in other than trace amounts. Page 16 of 25 Permit NC0004979 A. (14.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 108) [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 108—Toe Drain Discharge 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 pH3 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,mg/L Monthly/Quarterly Grab Effluent Total Mercury4,ng/L Monthly/Quarterly Grab Effluent Total Barium,mg/L Monthly/Quarterly Grab Effluent Total Iron,mg/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 as N,mg/L Monthly/Quarterly Grab Effluent Sulfates,mg/L Monthly/Quarterly Grab Effluent Chlorides,mg/L Monthly/Quarterly Grab Effluent 'IDS,mg/L Monthly/Quarterly Grab Effluent Total Hardness,mg/L Monthly/Quarterly Grab Effluent Temperature,OC Monthly/Quarterly Grab Effluent Conductivity,µmho/cm Monthly/Quarterly Grab Effluent Footnotes 1. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application system Please See Special Condition A (26) 2 The facihty 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 pH shall not be less than 6 0 standard units nor greater than 9 0 standard units 4 The facility shall use EPA method 1631E 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 toe drain,the Permittee shall submit its DMR, as required, and indicate "No Flow"for the toe drain(15A NCAC 02B .0506(a)(1)(E)). There shall be no discharge of floating solids or visible foam in other than trace amounts. Page 17 of 25 Permit NC0004979 A. (15.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 108B) [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 108B—Toe Drain Discharge 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 pH3 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,mg/L Monthly/Quarterly Grab Effluent Total Mercury4,ng/L Monthly/Quarterly Grab Effluent Total Barium,mg/L Monthly/Quarterly Grab Effluent Total Iron,mg/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 as N,mg/L Monthly/Quarterly Grab Effluent 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 Temperature,°C Monthly/Quarterly Grab Effluent Conductivity,µmho/cm I Monthly/Quarterly Grab Effluent Footnotes 1 The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application system Please See Special Condition A (26) 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 pH shall not be less than 6.0 standard units nor greater than 9.0 standard units 4 The facility shall use EPA method 1631E 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 toe drain, the Permittee shall submit its DMR, as required, and indicate "No Flow" for the toe drain(15A NCAC 02B .0506(a)(1)(E)). There shall be no discharge of floating solids or visible foam in other than trace amounts. Page 18 of 25 Permit NC0004979 A. (16.) SPECIAL CONDITION FOR THE DISCHARGE OF ASIATIC CLAM/DEBRIS FILTER BACKWASH [NCGS 143-215 3 (a) (2) and NCGS 143-215.66] The permittee may backwash the intake filter for Unit 5 condenser cooling water on an as-needed basis It is understood that this wash water will contain materials indigenous to the Catawba River such as Asiatic clams and light debris As these are naturally occurring in the river environment,they may be discharged with no adverse affects to the receiving stream The Permittee may not add any detergent, chemicals or other non-indigenous material to the wash water without explicit permission from the Division of Water Resources. A. (17.) CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QUARTERLY/MONTHLY) (Outfall 002 and Outfall 006) [15A NCAC 02B 0200 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 23.6% for decanting/normal operations (Outfall 002), 5 1% for retention basin discharge (Outfall 006),and 1 6% for dewatermg(Outfall 002) The permit holder shall perform at a minimum,quarterly(for normal operation/decanting at Outfall 002 and Outfall 006),and monthly(for dewatering at Outfall 002)monitoring using test procedures outlined in the"North Carolina Cenodaphnza 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 month 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,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. 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(Al) 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, Page 19 of 25 Permit NC0004979 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 NO 1'F• 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. (18.) BIOCIDE CONDITION [NCGS 143-215 1] 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 A. (19.)ADDITIONAL CONDITIONS AND DEFINITIONS [NCGS 143-215.3 (a) (2) and NCGS 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. 10 The applicant is permitted to discharge chemical metal cleaning wastes to the ash basin 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. (20.) 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. Page 20 of 25 Permit NC0004979 A. (21.) CLEAN WATER ACT SECTION 316 (a)THERMAL VARIANCE [40 CFR 125,Subpart H] The thermal variance granted under Section 316(a) terminates on expiration of this NPDES permit Should the permittee wish a continuation of its 316(a) thermal variance beyond the term of this permit,reapplication for such continuation shall be submitted in accordance with 40 CFR Part 125,Subpart H and Section 122 21(m)(6) not later than 180 days prior to permit expiration Reapphcation shall include a basis for continuation such as a)plant operating conditions and load factors are unchanged and are expected to remain so for the term of the reissued permit,b) there are no changes to plant discharges or other discharges in the plant site area which could interact with the thermal discharges,and c) there are no changes to the biotic community of the receiving water body which would impact the previous variance determination The next 316(a) studies shall be performed in accordance with the Division of Water Resources approved plan The temperature analysis and the balanced and indigenous study plan shall conform to the specifications outlined in 40 CFR 125 Subpart H,the EPA's Draft 316(a) Guidance Manual, dated 1977,and the Region 4 letter to NCDENR, dated June 3,2010 EPA shall be provided an opportunity to review the plan prior to the commencement of the study Copies of all the study plans,study results,and any other applicable materials should be submitted to. 1) Electronic Version Only(pdf and CD) Division of Water Resources WQ Permitting Section-NPDES 1617 Mail Service Center Raleigh,NC 27699-1617 2) Electronic Version (pdf and CD) and Hard Copy Division of Water Resources Water Sciences Section 1623 Mail Service Center Raleigh,NC 27699-1623 A. (22.) CLEAN WATER ACT SECTION 316 (b) [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 Copies of all the study plans,study results, and any other applicable materials should be submitted to 1) Electronic Version Only(pdf and CD) Division of Water Resources WQ Permitting Section-NPDES 1617 Mail Service Center Raleigh,NC 27699-1617 2) Electronic Version (pdf and CD) and Hard Copy Division of Water Resources Water Sciences Section 1623 Mail Service Center Raleigh,NC 27699-1623 A. (23.) 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 apphcatton The objective of this monitoring is to evaluate potential uptake of pollutants by fish tissue near the ash Page 21 of 25 Permit NC0004979 pond discharge The parameters analyzed in fish tissue shall be 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 all the study plans,study results,and any other applicable materials should be submitted to. 1) Electronic Version Only(pdf and CD) Division of Water Resources WQ Permitting Section-NPDES 1617 Mail Service Center Raleigh,NC 27699-1617 2) Electronic Version (pdf and CD) and Hard Copy Division of Water Resources Water Sciences Section 1623 Mail Service Center Raleigh,NC 27699-1623 A. (24.) INSTREAM MONITORING [15A NCAC 02B.0500 ET SEQ.] The facility shall conduct semiannual in-stream monitoring for total arsenic, total selenium, total mercury, total chromium, dissolved lead, dissolved cadmium, dissolved copper, dissolved zinc, total bromide, total hardness (as CaCO3), turbidity, temperature, and total dissolved solids (IDS) The monitoring results shall be reported on the facility's Discharge Monitoring Reports and included with the NPDES permit renewal application The upstream site (Station 250) is approximately 1.1 miles upstream of the discharge and downstream location (Station 238) is approximately 3 miles downstream of the discharge. A. (25.) PRIORITY POLLUTANT ANALYSIS [NCGS 143-215 1 (b)] The permittee shall conduct a priority pollutant analysis (in accordance with 40 CFR Part 136) once per permit cycle at all external outfalls and submit the results with the application for permit renewal A. (26.) 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 NO 1'h. 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)] The permittee shall report discharge monitoring data electronically using the NC DWR's Electronic Discharge Monitoring Report(eDMR)Internet application Page 22 of 25 Permit NC0004979 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 DEQ /Division of Water Resources /Water Quahty 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. 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 facilites 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 https //www federalregister gov/documents/2015/10/22/2015-24954/national-pollutant-discharge- ehmuiation-system-npdes-electronic-reporting-rule Electronic submissions must start by the dates listed in the"Reporting Requirements"section above Page 23 of 25 Permit NC0004979 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 4. Signatory Requirements [Supplements Section B. (11.) (b) and Supersedes Section B. (11.) (d)] All eDMRs submitted to the permit issuing authority shall be signed by a person described in Part II,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 22] NO OTHER STATEMENTS OF CERTIFICATION WILL BE ACCEPTED "I cert,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 forgathering 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)] 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. (27.) APPLICABLE STATE LAW(State Enforceable Only) [NCGS 143-215 1(b)] This facility shall meet the General Statute requirements under NCGS 5 130A-309 200 et seq.This permit may be reopened to include new requirements imposed under these Statutes Page 24 of 25 Permit NC0004979 A. (28.) 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 Page 25 of 25 c M S \ ; s NW— ; `\,,,�/_ -, 1.7';'1---.3( � /_ Q}- 1 _ 2S7S , �_ t 't` lam . •�)�/1 , f R, - v. 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I • *:, -(g C t YI r I ,'� - ••� - J LAKE WYLIE A,L �i ➢ �,7„rrr/s (CATAWBA ,. •-n.•••-•-••—•.--- . •. . RIVER) I-. LEGEND r`. Iw_4 ACTIVE ASH BASIN WASTE BOUNDARY -� _ 400 200 0 400 B00 FIGURE 1 .. EINACTIVE ASH BASIN WASTE BOUNDARY MIMIMIMIL=IGRAPHICSCALE MFEET ASH BASIN WASTE AND ��BASH BASIN COMPLIANCE BOUNDARY 110P145 RIVER STREET.SURE 220 COMPLIANCE BOUNDARIES MILANDFILLBOUNDARY GLL AEERVE s°L""a"°'""2'°°' ALLEN STEAM STATION PRONE 86442,9999 LANDFILL COMPLIANCE BOUNDARY '� . "....•••. DUKE ENERGY CAROLINAS,LLC �I ASH STORAGE AND STRUCTURAL Flit BOUNDARY � erra WN BY101. LL DAME 01/10/201B01/10/201BBELMONT,NORTH CAROLINA ALDRAW PLANT SETS BOUNDARY BJ1,TIV17112'1LTT.Iw.I..N1.1.1 1-.11.1.,.,1....n, roan .0614,.m....sm.: )