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Home My WebLink AboutNC0003468_Draft Permit_20181030 rs ROY COOPER Governor -'t `� MICHAEL S.REGAN Secretary • Ma 44' LINDA CULPEPPER Interim Director NORTH CAROLINA Environmental Quality October 30,2018 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 Major Modification Permit NC0003468 Dan River Combined Cycle Station Rockingham 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 major modification contains the following significant changes from your current permit: 1. Monitoring and limits for BOD and Fecal Coliforms have been eliminated due to the removal of the domestic wastewater from Outfall 001. 2. The Special Conditions for Ash Pond Working Capacity and Ash Pond Closure have been removed since all the ash will be excavated by August 1, 2019. 3. The Outfall 002A is permanently plugged and has been removed from the permit. 4. The Special Condition Groundwater Monitoring Well has been replaced with the Special Condition Compliance Boundary to be consistent with other Duke Permits. Please provide any comments you have regarding the draft permit to this office by November 30, 2018. At this time, the Division is also publishing a notice in the newspapers of general circulation in Rockingham 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) that are a part of the permit are not included in this draft document(cover,map,and Part I).The conditions are the same as in your current permit except that agency and division names have been updated.The latest version is available at https://bit.ly/2BZ4xxx and can be viewed online or downloaded as a PDF file. Not tat Carvs:?na lit pat ureal of Emit otottetiul Quaky I Ditiston of v lana Resotat cies 512 Nal tit S:rlisbut}t Street lonlail Se-nice Center I Ra"eigPh,North Carolina 27699•6611 fl 914.7073601 If you have any questions about the NPDES permit process,please contact me at the following e-mail address: sergei.chernikov( ncdenr.gov,or telephone number: 919-707-3606. Sincerely, it-'-‘..- Sergei Chernikov,Ph.D. Environmental Engineer II Complex NPDES Permitting Unit cc: NPDES Files EPA Region IV(e-copy) Winston-Salem Regional Office/Surface Water Protection(e-copy) Aquatic Toxicology Unit(e-copy) . TACU (e-copy) Page 2 of 2 Permit NC0003468 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENTAL QUALITY DIVISION OF WATER RESOURCES Draft PERMIT TO DISCHARGE WASTEWATER UNDER THE NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM 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 Dan River Combined Cycle Station 864 South Edgewood Road Eden, NC Rockingham County _ to receiving waters designated as the Dan River in the Roanoke River Basin in accordance with effluent limitations, monitoring requirements, and other applicable 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 November 30, 2021. Signed this day J Linda Culpepper, Interim Director Division of Water Resources By Authority of the Environmental Management Commission Page 1 of 19 Permit NC0003468 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 the following: • Outfall 001: once-through cooling water and codling tower blowdown from the combined cycle unit, intake screen backwash, plant collection sumps (low volume wastes), and treated domestic wastewater; • Internal Outfall 001A (discharges to Outfall 001): wastes from the filtered water plant including miscellaneous wash down water and laboratory wastes (low volume waste sources); • Outfall 002: an ash basin discharge consisting of low volume wastes, boiler cleaning wastewater, ash disposal, stormwater, boiler blowdown, and metal washing wastewater; • Outfall 002A: a yard sump overflow consisting of stormwater runoff, miscellaneous sumps, and coal yard runoff; • Seep Outfalls 102, 103, 104 (Outfall 104 also contains stormwater): 3 potentially contaminated groundwater seeps; and 2. Discharge from said treatment works at the location specified on the attached map into the Dan River (Seep Outfall 104 and Railroad Branch (Seep Outfalls 102 and 103) which is classified C waters in the Roanoke River Basin. • Page 2of19 Permit NC0003468 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 once-through cooling water, intake screen backwash, cooling tower blowdown, plant collections sumps, and treated domestic wastewater from Outfall 001. Such discharges shall be limited and monitoreds by the permittee as specified below: LIMITS MONITORING REQUIREMENTS EFFLUENT Monthly Daily Measureme Sample Sample CHARACTERISTICS Average Maximum nt Type Location' Frequency Flow, MGD Daily Pump Logs Upstream or Effluent Temperature, 35.0 °C Daily Grab Effluent Temperature, 32.0 °C 2 Daily Grab Downstream Temperature, °C 3 Daily Grab Upstream, Effluent Total Iron, mg/L Quarterly Grab Effluent Total Suspended Solids 30.0 mg/L 100.0 mg/L 2/Month Grab Effluent Oil and Grease 15.0 mg/L 20.0 mg/L 2/Month ` Grab Effluent pH 6.0 <_ pH s 9.0 2/Month Grab Effluent Total Residual Chlorine 4 28.0 µg/L 2/Month Grab Effluent Total Mercury6 47.0 ng/L Quarterly Grab Effluent Notes: 1. Sample locations: Upstream-at intake; Downstream-downstream approximately two (2) miles near the NCSR 700 bridge crossing; Effluent - at point downstream of combined wastewaters from the combined cycle turbine unit. 2. In no case should the ambient temperature exceed 32°C as a result of Dan River Steam Station operations. The ambient temperature shall be defined as the daily average downstream water temperature. When the effluent temperature is recorded below 32°C as a daily average, then monitoring and reporting of the downstream water temperature is not required. In cases where the permittee experiences equipment problems and is unable to obtain daily temperatures from the existing temperature monitoring system, temperature monitoring must be reestablished within five working days. 3. The daily average temperature of the effluent shall be such as not to exceed 10°C if the daily average intake temperature is below 2.5°C, and shall not exceed two times the intake temperature (°C) plus 5 if the daily average intake temperature ranges from 2.5°C to 12.8°C. This limitation is in effect only when a single control unit is operating: 4. Total Residual Chlorine compliance is required only if chlorine or chlorine derivative is added to the cooling water. 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 50 µg/L. 5. Starting on December 21, 2016, begin submitting Discharge Monitoring Reports electronically using NC DWR's eDMR application system. Please See Special Condition A. (18.). 6. The facility shall use EPA method 1631E. Annual average limit. The mixing zone is defined as the area extending from the power plant intake to the NCSR 700 bridge crossing (downstream approximately two miles). Page 3 of 19 Permit NC0003468 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. 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 of Water Resources prior to using any biocide in the cooling water; see condition A. (12.). There shall be no discharge of floating solids or foam visible in other than trace amounts. A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall OO1A) [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 wastewater from the filtered water plant including wash down water and laboratory wastes (low volume waste sources) through Internal Outfall OO1A. Such discharges shall be limited and monitored2 by the permittee as specified below: EFFLUENT LIMITS MONITORING REQUIREMENTS CHARACTERISTICS ' Monthly Daily Measurement Sample Sample Average Average Frequency Type Location' Total Suspended Solids 30.0 mg/L 100.0 mg/L 2/Month Grab Effluent . Oil & Grease 15.0 mg/L 20.0 mg/L 2/Month Grab Effluent pH 6.0 s pH 9.0 2/Month Grab Effluent Notes: 1. Effluent sample location shall be at point downstream of the oil separator and prior to mixing with outfall 001. 2. Starting on December 21, 2016, begin submitting Discharge Monitoring Reports electronically using NC DWR's eDMR application system. Please See Special Condition A. (18.). Should no flow occur during a given month, the words "no flow" should be clearly written on the front of the DMR. All samples shall be a representative discharge. There shall be no discharge of floating solids or foam visible in other than trace amounts. • Page 4 of 19 Permit NC0003468 A. (3.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 002-normal operations/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 effluent from Outfall 002 (decanting the free water above the settled ash layer that does not involve mechanical disturbance of the ash) consisting of low volume wastes, boiler cleaning wastewater, ash disposal, stormwater, boiler blowdown, and metal washing wastewater. Such discharges shall be limited and monitored5 by the permittee as specified below: EFFLUENT LIMITS MONITORING REQUIREMENTS CHARACTERISTICS Monthly Daily Measurement Sample Sample Average Maximum Frequency Type Locations Flow, MGD Daily Pump Logs Effluent or estimate pH8 6.0 <_ pH < 9.0 Monthly Grab Effluent Total Suspended Solids6 29.0 mg/L 96.0 mg/L Monthly Grab Effluent Oil and Grease 14.0 mg/L 19.0 mg/L Monthly Grab Effluent Total Kjeldahl Nitrogen Annually Grab Effluent (TKN), mg/L Total Nitrogen (TN), mg/L Annually Calculated Effluent TN = (NO2 + NO3) + TKN Total Phosphorus, mg/L Annually Grab Effluent Chronic Toxicity2 Monthly Grab Effluent Turbidity3, NTU Monthly Grab Effluent Sulfate, mg/L Monthly Grab Effluent Total Hardness, mg/L Monthly Grab, Effluent Total Arsenic, µg/L Weekly Grab Effluent Total Chromium, µg/L Weekly Grab Effluent Total Lead, µg/L Weekly Grab Effluent Total Copper, µg/L Weekly Grab Effluent Total Cadmium, µg/L Weekly Grab Effluent Total Zinc, µg/L Weekly Grab Effluent • Total Dissolved Solids, Weekly Grab Effluent mg/L Total Mercury4 47.0 ng/L Weekly Grab Effluent Total Iron 1.0 mg/L 1.0 mg/L Weekly Grab Effluent Total Selenium, µg/L Weekly Grab Effluent Nitrate/nitrite as N Monthly Grab Effluent Notes: 1. Effluent sampling shall be conducted at the discharge from the ash settling pond prior to mixing with any other waste stream. 2. Chronic Toxicity (Ceriodaphnia dubia) at 1.1%; See Special Condition A. (10.). 3. 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)). 4. The facility shall use EPA method 1631E. Annual average limit. Page 5 of 19 Permit NC0003468 5. Starting on December 21, 2016, begin submitting Discharge Monitoring Reports electronically using NC DWR's eDMR application system. Please See Special Condition A. (18.). 6. The facility shall continuously monitor TSS concentration when the decanting process commences and the pump shall be shutoff automatically when the 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 only required when the pumps are employed. 7. Monitoring for total iron and its discharge limits apply only if wastewater from a boiler chemical cleaning is generated and discharged to the ash basin. 8. The facility shall continuously monitor pH when the decanting process commences and the decanting pump shall be shutoff 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. 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 level of water in the ash pond should not be lowered more than 1 ft/week, unless approved by the DEQ Dam Safety Program. 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. (4.) of the permit apply when water in the ash settling basin is lowered below the three feet trigger mark. The facility shall treat the wastewater discharged from the ash pond/ponds by the physical- chemical treatment facilities. The facility shall submit plans for the proposed treatment technologies to the Complex NPDES permitting unit and the Winston-Salem Regional Office 2 weeks prior to the commencement of the treated discharge. The facility shall notify the Complex NPDES Permitting Unit and the Winston-Salem Regional Office 1 week prior to the commencement of the treated discharge. Page 6 of 19 Permit NC0003468 A. (4.) 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 date of the dewatering operation and lasting until expiration, the Permittee is authorized to discharge effluent from Outfall 002 (dewatering- removing the interstitial water) consisting of low volume wastes, boiler cleaning wastewater, ash disposal, stormwater, boiler blowdown, and metal washing wastewater. Such discharges shall be limited and monitored5 by the permittee as specified below: EFFLUENT LIMITS MONITORING REQUIREMENTS CHARACTERISTICS Monthly Daily Measurement Sample Sample Average, Maximum Frequency Type. Location' Flow 1.5 MGD Weekly Pump Logs Effluent or estimate pH$ 6.0 <_ pH s 9.0 Weekly Grab Effluent Total Suspended Solids6 29.0 mg/L 96.0 mg/L Weekly Grab Effluent Oil and Grease 14.0 mg/L 19.0 mg/L Weekly Grab Effluent Total Kjeldahl Nitrogen Weekly Grab Effluent (TKN), mg/L Total Nitrogen (TN), mg/L Weekly Calculated Effluent TN = (NO2 + NO3) + TKN Total Phosphorus, mg/L _ Weekly Grab Effluent Chronic Toxicity2 Monthly Grab Effluent Turbidity3, NTU Weekly Grab Effluent Sulfate, mg/L Weekly Grab Effluent Total Hardness, mg/L Weekly Grab Effluent Total Arsenic, µg/L Weekly Grab Effluent Total Chromium, µg/L Weekly Grab Effluent Total Lead, µg/L Weekly Grab Effluent Total Copper, µg/L Weekly Grab Effluent Total Cadmium, µg/L Weekly Grab Effluent Total Zinc, µg/L Weekly Grab Effluent Total Dissolved Solids, Weekly Grab Effluent mg/L Total Mercury4 47.0 ng/L Weekly Grab Effluent Total Iron 1.0 mg/L 1.0 mg/L Weekly Grab Effluent Total Selenium, µg/L Weekly Grab Effluent Nitrate/nitrite as N Weekly Grab Effluent Notes: ' 1. Effluent sampling shall be conducted at the discharge from the ash settling pond prior to mixing with any other waste stream. 2. Chronic Toxicity (Ceriodaphnia dubia) at 1.1%; See Special Condition A. (10.). 3. 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)). 4. The facility shall use EPA method 1631E. Annual average limit. 5. Starting on December 21, 2016, begin submitting Discharge Monitoring Reports electronically using NC DWR's eDMR application system. Please See Special Condition A. (18.). Page 7 of 19 Permit NC0003468 6. The facility shall continuously monitor TSS concentration when the dewatering process commences and the dewatering pump shall be shutoff automatically when the 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 only required when the pumps are employed. 7. Monitoring for total iron and its discharge limits apply only if wastewater from a boiler chemical cleaning is generated and discharged to the ash basin. 8. The facility shall continuously monitor pH when the dewatering process commences and the dewatering pump shall be shutoff 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. There shall be no discharge of floating solids or visible foam in other than trace amounts. The level of water in the ash pond should not be lowered more than 1 ft/week, unless approved by the DEQ Dam Safety Program. The facility shall treat the wastewater discharged from the ash pond/ponds by the physical- chemical treatment facilities. The facility shall submit plans for the proposed treatment technologies to the Complex NPDES permitting unit and the Winston-Salem Regional Office 2 weeks prior to the commencement of the treated discharge. The facility shall notify the Complex NPDES Permitting Unit and the Winston-Salem Regional Office 1 week prior to the commencement of the treated discharge. Page 8of19 • Permit NC0003468 A. (5.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 102) [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 102 - Seep Discharge. Such discharges shall be limited and monitored' by the Permittee as specified below: EFFLUENT LIMITS 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 150.0 µg/L 340.0 µg/L Monthly/Quarterly Grab Effluent Total Aluminum 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 2.94 µg/L 75.5 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 Temperature, 0C Monthly/Quarterly Grab Effluent Conductivity, µmho/cm Monthly/Quarterly Grab Effluent Notes: 1. Starting on December 21, 2016, begin submitting Discharge Monitoring Reports electronically using NC DWR's eDMR application system. Please See Special Condition A. (18.). 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 the facility is unable to obtain a seep sample due to the dry or low flow conditions preventing the facility from obtaining a representative sample, then "no flow" should be reported on the DMR. This requirement is established in the Section D of the Standard Conditions and 40 CFR 122.41 U). There shall be no discharge of floating solids or visible foam in other than trace amounts. Page 9 of 19 Permit NC0003468 A. (6.) 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 -Seep Discharge. Such discharges shall be limited and monitored' by the Permittee as specified below: EFFLUENT - LIMITS, MONITORING REQUIREMENTS ` - CHARACTE RISTICS 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 • 150.0 µg/L 340.0 µg/L Monthly/Quarterly Grab Effluent Total Aluminum 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 2.94 µg/L 75.5 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 Temperature, 0C Monthly/Quarterly Grab Effluent Conductivity, µmho/cm Monthly/Quarterly Grab Effluent Notes: 1. Starting on December 21, 2016, begin submitting Discharge Monitoring Reports electronically using NC DWR's eDMR application system. Please See Special Condition A. (18.). 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 the facility is unable to obtain a seep sample due to the dry or low flow conditions preventing the facility from obtaining a representative sample, then "no flow" should be reported on the DMR. This requirement is established in the Section D of the Standard Conditions and 40 CFR 122.41 (j). There shall be no discharge of floating solids or visible foam in other than trace amounts. Page 10 of 19 Permit NC0003468 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-Seep Discharge and stormwater discharge. Such discharges shall be limited and monitored' by the Permittee as specified below: EFFLUENT LIMITS MONITORING REQUIREMENTS CHARACTERISTICS Monthly Dilly Measurement Sample ,Sample °, Average Maximum °Frequency2' - Type Location Flow, MGD Monthly/Quarterly Estimate Effluent pH3 Monthly/Quarterly Grab Effluent TSS 30.0 mg/L 10.0.0 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/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 Temperature, °C Monthly/Quarterly Grab Effluent Conductivity, µmho/cm Monthly/Quarterly Grab Effluent Notes: 1. Starting,on December 21, 2016, begin submitting Discharge Monitoring Reports electronically using NC DWR's eDMR application system. Please See Special Condition A. (18.). 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 the facility is unable to obtain a seep sample due to the dry or low flow conditions preventing the facility from obtaining a representative sample, then "no flow" should be reported on the DMR. This requirement is established in the Section D of the Standard Conditions and 40 CFR 122.41 (j). There shall be no discharge of floating solids or visible foam in other than trace amounts. Page 11 of 19 Permit NC0003468 A. (8.) TOXICITY RE-OPENER CONDITION [15A NCAC 02B .0200 et seq.] This permit shall be modified, or revoked and reissued, to incorporate additional toxicity limitations and monitoring requirements in the event that 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. (9.) SPECIAL CONDITIONS [NCGS 143-215.3 (a) (2) and NCGS 143-215.66] The following special conditions are applicable to all outfalls regulated by this permit: a) There shall be no discharge of polychlorinated biphenyl compounds such as those once commonly used for transformer fluid. _ b) 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 or regulations. c) Discharge of any waste resulting from the combustion of toxic or hazardous waste to any waste stream which ultimately discharges to waters of the United States is prohibited, unless specifically authorized in this permit. d) The permittee shall report all visible discharges of floating materials (such as an oil slick) to the Director when submitting DMRs. e) "Upset," means an exceptional incident in which there is an unintentional and temporary non-compliance with technology-based effluent limitations because of factors beyond the reasonable control of the permittee. An upset does not include noncompliance to the extent cause by operational error, improperly designed treatment facilities, inadequate treatment facilities, lack of preventative maintenance, or improper operations. f) All flows shall be reported on monthly DMRs. Should no flow occur during a given month, the words "no flow" should be clearly written on the front of the DMR. g) EPA methods 200.7 or 200.8 (or the most current versions) shall be used for analyses of all metals except for total mercury. • h) 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)). i) 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)). j) 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)). k) 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)). 1) 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. m) The concentration of asbestos in any wastewater shall not exceed 7 million fibers per liter. A. (10.) CHRONIC TOXICITY LIMIT (Monthly, Outfall 002) [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 1.1 %. 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 Page 12of19 Permit NC0003468 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 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 (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 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.) 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 Page 13 of 19 Permit NC0003468 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. (12.) 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(1) (6) not later than 180 days prior to permit expiration. Reapplication 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 and the EPA's Draft 316(a) Guidance Manual, dated 1977. 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 1621 Mail Service Center Raleigh, NC 27699-1621 A. (13.) 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. A. (14.) STRUCTURAL INTEGRITY INSPECTIONS OF ASH POND DAM [15A NCAC 02K.0208] The facility shall meet the dam design and dam safety requirements per 15A NCAC 2K. A. (15.) INSTREAM MONITORING [15A NCAC 02B.0500 ET SEQ.] The facility shall conduct semiannual instream monitoring (4000 ft. upstream and 10,000 ft. downstream of the Outfall 002 and in the Railroad Branch 50 ft. upstream of the first seep and 50 ft. Page 14 of 19 Permit NC0003468 downstream of the last seep) for dissolved arsenic, dissolved selenium, dissolved mercury (method 1631E), dissolved chromium, dissolved lead, dissolved cadmium, dissolved copper, total hardness, and dissolved zinc. The monitoring results shall be submitted with the NPDES permit renewal application and reported on the DMRs. A. (16.) APPLICABLE STATE LAW(STATE ENFORCEABLE ONLY) [NCGS 143-215.1(b)] This facility shall meet the requirements of Senate Bill 729 (Coal Ash Management Act). This permit may be reopened to include new requirements imposed by Senate Bill 729. A. (17.) DOMESTIC WASTEWATER TREATMENT PLANT [NCGS 143-215.1(b)] The domestic wastewater treatment facility shall be properly operated and maintained at all times. Its effluent must meet secondary limits for domestic wastewater, and not cause contravention of any water quality standards. A. (18.) 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)1 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 Page 15 of 19 Permit NC0003468 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 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-pollutant- 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 Page 16 of 19 Permit NC0003468 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.) OM 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 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." Page 17 of 19 Permit NC0003468 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 maybe extended by request of the Director at any time [40 CFR 122.41]. A. (19.) DISCHARGE FROM SEEPAGE [NCGS 143-215.1(b)] Existing Discharges from Seepage The facility identified 4 unpermitted seeps (all non-engineered) from the ash settling basin. Seep 1, seep 2, and seep 3 discharge to Railroad Branch. Seep 4 discharges to Dan River. The locations of the seeps are identified below and are depicted on the map attached to the permit. Table 1. Discharge Coordinates and Assigned Outfall Numbers Discharge ID Latitude Longitude Outfall number S-1 36.493 -79.711 Not assigned S-2 36.493 -79.711 102 S-3 36.493 -79.711 103 S-4 36.486 -79.719 104 The outfall for these discharges is through an effluent channel meeting the requirements in 15A NCAC 2B .0228. Within 180 days of the effective date of this permit, the permittee shall demonstrate, through in-stream sampling meeting the requirements of condition A. (19.), that the water quality standards in the receiving stream are not contravened. Discharges from Seepage Identified After Permit Issuance The facility shall comply with the "Plan for Identification of New Discharges" as contained in Attachment 2. For any discharge identified pursuant to this Plan, the facility shall, within 90 days of the seep discovery, determine if the discharge seep meets the state water quality standards established in 15A NCAC 2B .0200 and submit the results of this determination to the Division. If the standards are not contravened, the facility shall conduct monitoring for the parameters specified in A. (8.). If any of the water quality standards are exceeded, the facility shall be considered in violation until one of the options below is fully implemented: 1) Submit a complete application for 404 Permit (within 30 days after determining that a water quality standards is exceeded) to pump the seep discharge to one of the existing outfalls, install a pipe to discharge the seep to the Dan River/Railroad Branch, or install an in-situ treatment system. After the 404 Permit is obtained, the facility shall complete the installation of the pump, pipe, or treatment system within 180 days from the date of the 404 permit receipt and begin pumping/discharging or treatment. 2) Demonstrate through modeling that the decanting and dewatering of the ash basin will result in the elimination'of the seep. The modeling results shall be submitted to the Division within 120 days from the date of the seep discovery. Within 180 days from the completion of the dewatering the facility shall confirm that the seep flow ceased. If the seep flow continues, the facility shall choose one of the other options in this Special Condition. 3) Demonstrate that the seep is discharging through the designated "Effluent Channel" and the water quality standards in the receiving stream are not contravened. This demonstration should be submitted to the Division no later than 180 days from the date of the seep discovery. The "Effluent Channel" designation should be established by the DEQ Regional Office personnel prior to the issuance of the permit. This permit shall be reopened for cause to include the "Effluent Channel" in a revised permit. Page 18 of 19 Permit NC0003468 All effluent limits, including water quality-based effluent limits, remain applicable notwithstanding any action by the Permittee to address the violation through one of the identified options, so that any discharge in exceedance of an applicable effluent limit is a violation of the Permit as long as the seep remains flowing. New Identified Seeps If new seeps are identified, the facility shall follow the procedures outlined above. The deadlines for new seeps shall be calculated from the date of the seep discovery. The new identified seep is not permitted until the permit is modified and the new seep included in the permit and the new outfall established for the seep. A. (20.) FISH TISSUE MONITORING NEAR ASH POND DISCHARGE (Outfall 002) [NCGS 143-215.3 (a) (2)] The facility shall conduct fish tissue monitoring annually during the permit term and submit the results with the NPDES permit renewal application. The objective of the monitoring is to evaluate potential uptake of pollutants by fish tissue near the Ash 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. Upon approval, the plan becomes an enforceable part of the permit. A. (21.) 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. 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'-,) \A ‘•• '\' \f-\ 'i,:'..-' \ .) ' . '.'`''::-. )?, : --v 7..,:..,-, . --"„zr . )) • � \i' /2 ��f •.—/ _ rteo1)-.... r ( ,-, (----.! i r 54,„ , ,.. ,\.. ,,,., . ca..._ 4(.°,-11r,e) /P-7-)-) ,,. .. ( . .,-, ,W.../ ,76/67-,T.A--,-ini7,- /---/ i) _ 'ez./ r_Ar., 1 V?".6--4 :- _if-\\E, USGS Quad: B2ONW Southeast Eden, NC �, Outfall 001 Outfall 002 Latitude: 36° 29' 7.9" N 36° 29' 30.1" N Longitude: 79° 43' 13.9"W 79° 42' 39.6"W Subbasin: 03-02-03 HUC: 03010103 North Facility Location Stream Class: C Duke Energy Carolinas - Dan River Station Receiving Stream: Dan River NPDES Permit No. NC0003468 Rockingham County I _