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Home My WebLink AboutNC0003433_Draft Permit_20180627 ROY COOPER Governor Ar MICHAEL S. REGAN Secretary M LINDA CULPEPPER Water Resources Interim Director ENVIRONMENTAL QUALITY June 27, 2018 Mr. Paul Draovitch Senior Vice President Environmental, Health & Safety Duke Energy Progress, LLC 526 S. Church Street Mail Code: EC3XP Charlotte,North Carolina 28202 Subject: Draft NPDES Permit Modification&Renewal Permit NC0003433 Cape Fear Steam Electric Plant Chatham County Class II Facility SIC 4911 Dear Mr. Draovitch: Enclosed with this letter is a copy of the Draft NPDES permit Modification & Renewal for your facility. Please review this draft carefully to ensure thorough understanding of the requirements and conditions it contains. There are several changes from the existing permit, including the following: • Outfalls 001 and 005 have been repurposed for discharge of episodic emergency overflows from East & West Ash Basins, and flow monitoring requirements have been added to the permit [See Sections A. (1.) and A. (2.)]. • Outfall 007 has been repurposed for discharge of ash pond decanting wastewater, stormwater, emergency episodic discharge from Internal Outfalls 001 and 005, and Constructed French Drain wastewater to the unnamed tributary to the Cape Fear River. Effluent limitations and monitoring requirements for Outfall 007 have been added to the permit [See Section A. (3.)]. • A new Outfall (Outfall 008) has been added to the permit for discharge of ash pond decanting wastewater,dewatering wastewater and groundwater remediation wastewater to the Cape Fear River. Effluent Limitations and monitoring requirements have been added to Outfall 008 [See Sections A. (4.), A. (5.),A. (6.) and A. (7.)]. • A new Outfall (Outfall 008A) has been added to the permit for discharge of episodic emergency overflows from 1963/1970 Ash Basins,and flow monitoring requirements have been added to the permit [See Section A. (8.)]. State of North Carolina I Environmental Quality I Water Resources 512 N.Salisbury Street 11617 Mail Service Center I Raleigh,North Carolina 27699-1617 919 807 6464 Page 12 • A new Outfall (Outfall 009) has been added to the permit for discharge of episodic beneficiation process area wastewater to the Cape Fear River. Effluent Limitations and monitoring requirements have been added to Outfall 009 [See Section A. (9.)]. • Following Sections and Special conditions from existing permit has been removed from this permit renewal: - Effluent Limitations and Monitoring Requirements(Outfall 003) - Intake Screen Backwash - Biocide Condition - Domestic Wastewater Treatment Plant - Section 316 (b)of CWA • Some of the wording has changed in Special Condition A. (10), Chronic Toxicity Limit (Quarterly). In addition, Special Condition A. (11.). Chronic Toxicity Limit(Monthly)has been added to the permit. Please review each paragraph carefully. • Following Special Conditions have been added to the permit,please review each carefully: - A. (12.)Additional Conditions and Definitions - A. (13.) Instream Monitoring - A. (16.) Compliance Boundary - A. (17.)Applicable State Law(State Enforceable Only) - A. (18.)Addition of Other Wastewaters to Ash Basin Treatment System • Some of the wording has changed in Special Condition A. (14.) Structural Integrity Inspections of Ash Basin Dam, please review carefully. • Special Condition A. (15.) Fish Tissue Monitoring Near Ash Basin Discharge has been revised,please review each paragraph carefully. • Federal regulations require electronic submittal of all discharge monitoring reports (DMRs)and program reports. The requirement to continue reporting discharge monitoring data electronically using the NC DWR's Electronic Discharge Monitoring Report(eDMR) interne application has been updated in the permit. [See Special Condition A. (19)]. • Regulatory citations have been added to the permit. 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://portal.ncdenr.org/c/document library/get file?uuid=b32f8a66-541 c-4cf5-8ba6- 03e381 edb2da&groupld=38364 Page 13 Concurrent with this notification the Division is publishing a notice in a newspaper having circulation in the general Chatham County area, soliciting public comments on this draft permit. Please provide any written comments you may have to the following: NCDEQ/DWR, NPDES Permitting Branch, 1617 Mail Service Center,Raleigh,NC 27699-1617 no later than 30 days after receipt of this draft permit. Following the 30-day public comment period,the Division will review all pertinent comments and take appropriate action prior to issuing a final permit. If you have questions concerning this draft permit,please call me at(919) 807-6389 or by email at bing.bai@ncdenr.gov. Sincerely, /;-rs1 Bing Bai, Engineer NPDES Complex Permitting Unit Hardcopy: NPDES Files Ecopy: US EPA Region 4(include Standard Conditions, Fact Sheet, Application) US EPA/Karrie-Joe Shell (include Standard Conditions, Fact Sheet) Email: Shell.Karrie-Joe®epa.gov DWR/PWSS Regional Engineer/Allen Hardy(include approval form) DWR/Regional Operations Section/Eric Smith DWR/Aquatic Toxicology Branch/Susan Meadows DWR/Raleigh Regional Office/Water Quality(include Fact Sheet) DWR/Operator Certification Unit/Maureen Kinney Duke Energy Progress, LLC/Richard Baker Email: Richard.Baker@duke-energy.com Permit NC0003433 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENTAL QUALITY DIVISION OF WATER RESOURCES PERMIT TO DISCHARGE WASTEWATER UNDER THE NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM In compliance with the provisions of North Carolina General Statute 143-215.1,other lawful standards and regulations promulgated and adopted by the North Carolina Environmental Management Commission,and the Federal Water Pollution Control Act, as amended, Duke Energy Progress LLC is hereby authorized to discharge wastewater from a facility located at the Cape Fear Steam Electric Power Plant 500 CP&L Road Moncure Chatham County to receiving waters designated as an unnamed tributary to the Cape Fear River (Outfall 007) and to the Cape Fear River(Outfalls 008, 009) in the Cape Fear 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 tbd. This permit and authorization to discharge shall expire at midnight on June 30, 2023. Signed this day tbd. Draft Linda Culpepper Interim Director, Division of Water Resources By Authority of the Environmental Management Commission Page 1 of 23 Permit NC0003433 SUPPLEMENT TO PERMIT COVER SHEET All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked, and as of this 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 Progress LLC is hereby authorized to: 1. Operate the following modified systems located at the decommissioned Cape Fear Steam Electric Power Plant at 500 CP&L Road near Moncure in Chatham County: • 1978 Ash Basin (Internal Outfall 001).This outfall is designated as an emergency discharge only and will consist of ash basin decanting wastewater. This is limited to discharging excess wastewater above the available treatment plant capacity during an eminent threat of 1978 Ash Basin overflow. • 1985 Ash Basin (Internal Outfall 005).This outfall is designated as an emergency discharge only and will consist of ash basin decanting wastewater. This is limited to discharging excess wastewater above the available treatment plant capacity during an eminent threat of 1985 Ash Basin overflow. • Combined Wastewater to an Unnamed Tributary to the Cape Fear River (Outfall 007). This outfall will discharge collected flows from the effluent channel consisting of ash basin comingled treated decanting wastewater, storm water, constructed seep flows, and episodic emergency flow from Internal Outfalls 001 and 005. • Combined Wastewater to the Cape Fear (Outfall 008). This new outfall will discharge combined flows of treated wastewater from the on-site treatment facility,if necessary,to assure state Water Quality Standards are not contravened in the receiving stream. • 1963/1970 Ash Basins (Outfall 008A). This new outfall is designated as an emergency discharge only and will consist of ash basin decanting wastewater. This is limited to discharging excess wastewater above the available treatment plant capacity during an eminent threat of 1963/1970 Ash Basin overflow. • Ash Beneficiation Retention Pond Wastewater (Outfall 009). This new outfall will discharge episodic wastewater collected from isolated areas of the beneficiation operation consisting of ash storage runoff, truck loading spills, and dust suppression. • Constructed French Drain (Internal Outfall S-05).This internal outfall [Lat: 35° 35' 25"N, Long: 79° 2' 47" W] is for discharge of combined flow from two French Drain sources to effluent channel of Outfall 007. 2. Discharges are to the Cape Fear River and unnamed tributaries to the Cape Fear River,and are classified as WS-IV waters in the Cape Fear River Basin. Page 2 of 23 Permit NC0003433 Part I A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS—Internal Outfall 001 [15A NCAC 02B .0400 et seq., 02B .0500 et seq.] a. During the period beginning on the effective date of this permit and lasting until expiration, the Permittee is authorized to discharge 1 on an emergency basis 1978 (West) Ash Basin decanting wastewater in excess of the facility's treatment capacity of 0.72 MGD to mitigate an eminent 1978 Ash Basin overflow. 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 Frequency 2 Type Location Flow Daily during Estimate Effluent Episodic Event Notes 1. The Permittee shall notify the Raleigh Regional Office(919) 791-4200 no later than the end of the next business day of the occurrence of an emergency discharge event including time of occurrence, duration, and cause. 2. During the duration of an emergency discharge event, the flow shall be reported daily. b. Upon the occurrence of an emergency overflow event, Outfall 007 effluent sampling and reporting shall commence immediately for the limited parameters listed in A.(3.)except for Mercury and Chronic Toxicity, and shall continue once per week for the duration of the emergency discharge event. Results of sampling from this Outfall shall meet the effluent limitations in A. (3.). c. There shall be no discharge of floating solids or visible foam in other than trace amounts. Page 3 of 23 Permit NC0003433 A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS—Internal Outfall 005 [15A NCAC 02B .0400 et seq., 02B .0500 et seq.] a. During the period beginning on the effective date of this permit and lasting until expiration, the Permittee is authorized to discharge ' on an emergency basis 1985 (East) Ash Basin decanting wastewater in excess of the facility's treatment capacity of 0.72 MGD to mitigate an eminent 1985 Ash Basin overflow. 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 Frequency 2 Type Location Flow Daily during Estimate Effluent Episodic Event Notes 1. The Permittee shall notify the Raleigh Regional Office(919) 791-4200 no later than the end of the next business day of the occurrence of an emergency discharge event including time of occurrence and cause. 2. During the duration of a discharge event,the flow shall be reported daily. b. Upon the occurrence of an emergency overflow event, Outfall 007 effluent sampling and reporting shall commence immediately for the limited parameters listed in A.(3.)except for Chronic Toxicity and Mercury, and shall continue once per week for the duration of the emergency discharge event. Results of sampling from this Outfall shall meet the effluent limitations in A. (3.). c. There shall be no discharge of floating solids or visible foam in other than trace amounts. Page 4 of 23 Permit NC0003433 A. (3.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS—Outfall 007 (decanting) [15A NCAC 02B .0400 et seq., 02B .0500 et seq.] a. During the period beginning on the effective date of this permit and lasting until expiration, the Permittee is authorized to discharge from Outfall 007 comingled treated ash basin decanting wastewater (decanting the free water above the settled ash layer that does not involve mechanical disturbance of the ash), stormwater, emergency episodic discharge from Internal Outfalls 001 & 005, and Constructed French Drain wastewater from S-05. 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 0.73 MGD Daily Estimate ' Effluent pH 2 6.0<pH <9.0 S.U. Monthly Grab Effluent Total Suspended Solids 3 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 Total Antimony 5.6 µg/L 5.6 µg/L Monthly Grab Effluent Total Arsenic 10.0 µg/L 340.0 µg/L Weekly Grab Effluent Total Molybdenum 160 µg/L 160 µg/L Monthly Grab Effluent Total Nickel 25.0 µg/L 335.2 µg/L Monthly Grab Effluent Total Selenium 5.0 µg/L 56.0 µg/L Weekly Grab Effluent Total Zinc 125.7 µg/L 125.7 µg/L Monthly Grab Effluent Turbidity 4 50 NTU Monthly Grab Effluent Total Mercury 5 12 ng/L, annual average Weekly Grab Effluent Total Cadmium, µg/L 6 Monthly Grab Effluent Total Copper, µg/L Monthly Grab Effluent Total Lead, µg/L Monthly Grab Effluent Fluoride, mg/L Monthly Grab Effluent Sulfates, mg/L Monthly Grab Effluent Total Dissolved Solids, mg/L Monthly Grab Effluent Thallium, µg/L Monthly Grab Effluent Chronic Toxicity 7 Quarterly Grab Effluent Total Hardness, mg/L Quarterly Grab Effluent Nitrate/Nitrite as N, mg/L Quarterly Grab Effluent Total Kjeldahl Nitrogen, mg/L Quarterly Grab Effluent Total Nitrogen, mg/L8 Quarterly Grab Effluent Total Phosphorus, mg/L Quarterly Grab Effluent Notes: 1. Flow estimate can be based on pumping log if pumps are in service at time of flow. If flow is occurring with no pumps operating then flow measurement is required by using a V-notch weir, stop watch and calibrated cylinder, or other methods approved by the Division (such as flow sensor devices). 2. Thefacility shall continuously monitor pH when the decanting process commences and the pump shall be shutoff automatically when the 15 minutes running average pH falls below 6.1 standard units or rises above 8.9 standards units. Pumping will be allowed to continue if interruption might result in a dam failure or damage. The continuous pH monitoring is only Page 5 of 23 Permit NC0003433 required when the pumps are employed. In the event of a shut-off of the decanting pumps, due to continuous monitoring of pH, decanting may continue once the results of operational samples show the wastewater is back to within the allowable range of the 15 minutes running average for pH. 3. The facility shall continuously monitor TSS concentration when the decanting process commences and the pump shall be shutoff automatically when the 15 minutes running average exceeds 50 mg/L. 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. In the event of a shut-off of the decanting pumps, due to continuous monitoring of TSS,decanting may continue once the results of operational samples show the wastewater is back to within the allowable range of the 15 minutes running average for TSS. 4. The discharge from this facility shall not cause turbidity in the receiving stream to exceed 50 NTU. If the instream turbidity exceeds 50 NTU due to natural background conditions, the discharge cannot cause turbidity to increase in the receiving stream. Therefore,if the effluent measurement exceeds 50 NTU, the Permittee shall sample upstream and downstream turbidity in the receiving waterbody, within 24 hours, to demonstrate the existing turbidity level in the receiving waterbody was not increased. All data shall be reported on the DMRs. (See 15A NCAC 2B .0211 (21)). 5. The facility shall use EPA method 1631E. Annual average shall be the calendar average. 6. Total Cadmium shall be measured to a Practical Quantitation Level of 0.5 µg/L. 7. Chronic Toxicity (Ceriodaphnia dubia) at 90% in February, May, August, and November; See Special Condition A. (10.). 8. Total Nitrogen=Total Kjeldahl Nitrogen+Nitrate/Nitrite as N. b. When the facility commences the ash pond/ponds decanting/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 Raleigh Regional Office, in writing, within seven calendar days of installing additional physical- chemical treatment at this Outfall. c. If one of the pollutants (As, Se, Hg, Ni, and Pb) reaches 85% of the allowable level during the decanting/dewatering, the facility shall immediately discontinue discharge of the wastewater and report it to the Regional Office and Complex NPDES Permitting Branch via telephone and e-mail. d. 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 15 A, Subchapter 2K. e. The facility shall use a floating pump station with free water skimmed from the ash basin wastewater surface using an adjustable weir. f. If no discharge occurs during the reporting period the Permittee shall submit its DMR eDMR), as required, and indicate"No Flow" (15A NCAC 02B .0506(a)(1)(E)). g. There shall be no discharge of floating solids or visible foam in other than trace amounts. Page 6 of 23 Permit NC0003433 A. (4.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS—Outfall 008 (decanting) [15A NCAC 02B .0400 et seq., 02B .0500 et seq.] a. During the period beginning on the effective date of this permit,and lasting until the commencement of ash basin dewatering, or the addition of groundwater remediation treated wastewater, or permit expiration,the Permittee is authorized to discharge from Outfall 008 comingled treated ash basin decanting wastewater(decanting the free water above the settled ash layer that does not involve mechanical disturbance of the ash). 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 1 Flow 0.72 MGD Daily Estimate 2 Effluent pH 3 6.0<_pH<9.0 S.U. Monthly Grab Effluent Total Suspended Solids 4 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 Total Mercury 5 47 ng/L, annual average 5 Weekly Grab Effluent Turbidity 6 50 NTU Monthly Grab Effluent Total Arsenic, µg/L Weekly Grab Effluent Total Selenium, µg/L Weekly Grab Effluent Total Nickel, µg/L Monthly Grab Effluent Total Lead, µg/L _ Monthly Grab Effluent Chronic Toxicity7 Quarterly Grab Effluent Total Hardness,mg/L Quarterly Grab Effluent Nitrite/Nitrate as N,mg/L Quarterly Grab Effluent Total Kjeldahl Nitrogen, mg/L Quarterly Grab Effluent Total Nitrogen, mg/L 8 Quarterly Grab Effluent Total Phosphorus, mg/L Quarterly Grab Effluent Notes: 1. Effluent=comingled sample of the treatment facility's wastewater. 2. Flow estimate can be based on pumping log if pumps are in service at time of flow. If flow is occurring with no pumps operating then flow measurement is required by using a V-notch weir, stop watch and calibrated cylinder, or other methods approved by the Division (such as flow sensor devices). 3. The facility shall continuously monitor pH when the decanting process commences and the pump shall be shutoff automatically when the 15 minutes running average pH falls below 6.1 standard units or rises above 8.9 standards 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. In the event of a shut-off of the decanting pumps, due to continuous monitoring of pH, decanting may continue once the results of operational samples show the wastewater is back to within the allowable range of the 15 minutes running average for pH. 4. The facility shall continuously monitor TSS concentration when the decanting process commences and the pump shall be shutoff automatically when the 15 minutes running average exceeds 50 mg/L. 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. In the event of a shut-off of the decanting pumps, due to continuous Page 7 of 23 Permit NC0003433 monitoring of TSS,decanting may continue once the results of operational samples show the wastewater is back to within the allowable range of the 15 minutes running average for TSS. 5. The facility shall use EPA method 1631E. Annual average shall be the calendar year. 6. 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)). 7. Chronic Toxicity(Ceriodaphnia dubia) at 1.7% in February, May, August, and November; See Special Condition A. (10.). 8. Total Nitrogen=Total Kjeldahl Nitrogen +Nitrate/Nitrite as N. b. When the facility commences the ash pond/ponds decanting/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 Raleigh Regional Office, in writing, within seven calendar days of installing additional physical- chemical treatment at this Outfall. c. If one of the pollutants (As, Se, Hg, Ni, and Pb) reaches 85% of the allowable level during the decanting/dewatering, the facility shall immediately discontinue discharge of the wastewater and report it to the Regional Office and Complex NPDES Permitting Branch via telephone and e-mail. d. 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 15 A, Subchapter 2K. e. The facility shall use a floating pump station with free water skimmed from the ash basin wastewater surface using an adjustable weir. f. If no discharge occurs during the reporting period the Permittee shall submit its DMR (eDMR), as required, and indicate "No Flow" (15A NCAC 02B.0506(a)(1)(E)). g. There shall be no discharge of floating solids or visible foam in other than trace amounts. Page 8 of 23 Permit NC0003433 A. (5.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS —Outfall 008 (dewatering) [15A NCAC 02B .0400 et seq., 02B .0500 et seq.] a. During the period beginning with the start of ash pond dewatering, and lasting until the addition of groundwater remediation treated wastewater, or permit expiration, the Permittee is authorized to discharge from Outfall 008 comingled treated ash basin dewatering wastewater. 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 I Flow 0.72 MGD Daily Estimate 2 Effluent pH 3 6.0<_pH<9.0 S.U. Weekly Grab Effluent Total Suspended Solids 4 30.0 mg/L 100.0 mg/L Weekly Grab Effluent Oil and Grease 15.0 mg/L 20.0 mg/L Weekly Grab Effluent Total Selenium 0.30 mg/L 2.73 mg/L Weekly Grab Effluent Total Mercury 5 47 ng/L, annual average Weekly Grab Effluent Turbidity 6 50 NTU Weekly Grab Effluent Total Aluminum,mg/L Weekly Grab Effluent Total Arsenic, µg/L Weekly Grab Effluent Total Cadmium, .tg/L 7 Weekly Grab Effluent Total Copper, pg/L Weekly Grab Effluent Total Nickel, pg/L Weekly Grab Effluent Total Lead, .tg/L Weekly Grab Effluent Chronic Toxicity 8 Monthly Grab Effluent Total Hardness,mg/L Quarterly Grab Effluent Nitrite/Nitrate as N,mg/L Quarterly Grab Effluent Total Kjeldahl Nitrogen, mg/L Quarterly Grab Effluent Total Nitrogen,mg/L 9 Quarterly Grab Effluent Total Phosphorus, mg/L Quarterly Grab Effluent Notes: 1. Effluent=comingled sample of the treatment facility's treated wastewater. 2. Flow estimate can be based on pumping log if pumps are in service at time of flow. If flow is occurring with no pumps operating then flow measurement is required by using a V-notch weir, stop watch and calibrated cylinder, or other methods approved by the Division (such as flow sensor devices). 3. The facility shall continuously monitor pH when the dewatering process commences and the pump shall be shutoff automatically when the 15 minutes running average pH falls below 6.1 standard units or rises above 8.9 standards 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. In the event of a shut-off of the dewatering pumps, due to continuous monitoring of pH,dewatering may continue once the results of operational samples show the wastewater is back to within the allowable range of the 15 minutes running average for pH. 4. The facility shall continuously monitor TSS concentration when the dewatering process commences and the pump shall be shutoff automatically when the 15 minutes running average exceeds 50 mg/L. 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 Page 9 of 23 Permit NC0003433 are employed. In the event of a shut-off of the dewatering pumps, due to continuous monitoring of TSS, dewatering may continue once the results of operational samples show the wastewater is back to within the allowable range of the 15 minutes running average for TSS. 5. The facility shall use EPA method 1631E. Annual average shall be the calendar year. 6. 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)). 7. Total Cadmium shall be measured to a Practical Quantitation Level of 0.5 µg/L. 8. Chronic Toxicity(Ceriodaphnia dubia) at 1.7%; See Special Condition A. (11.). 9. Total Nitrogen=Total Kjeldahl Nitrogen+Nitrate/Nitrite as N. b. When the facility commences the ash pond/ponds decanting/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 Raleigh Regional Office, in writing,within seven calendar days of installing additional physical- chemical treatment at this Outfall. c. Dewatering is the removal of interstitial water starting when the free water level in the settled ash basin is less than 3 feet, or if the water level is more than 3 feet above the ash starting when mechanical disturbance of the ash occurs. The limits and conditions in A. (5.) shall remain enforced until the groundwater remediation treated discharge has commenced. d. If one of the pollutants (As, Se, Hg, Ni, and Pb) reaches 85% of the allowable level during the decanting/dewatering, the facility shall immediately discontinue discharge of the wastewater and report it to the Regional Office and Complex NPDES Permitting Branch via telephone and e-mail. e. The facility shall submit written notification to the DWR Complex NPDES Permitting Unit and the DWR Raleigh Regional Office of the intent to begin the initial ash basin dewatering activity seven calendar days prior to commencing the dewatering. f. 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. g. If no discharge occurs during the reporting period the Permittee shall submit its DMR (eDMR), as required, and indicate"No Flow" (15A NCAC 02B .0506(a)(1)(E)). h. There shall be no discharge of floating solids or visible foam in other than trace amounts. Page 10 of 23 Permit NC0003433 A. (6.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS—Outfall 008 (dewatering and ground water remediation) [15A NCAC 02B .0400 et seq., 02B .0500 et seq.] a. During the period beginning with the start of groundwater remediation, and lasting until completion/termination of all ash basin dewatering activities,or permit expiration,the Permittee is authorized to discharge from Outfall 008 comingled treated ash pond dewatering wastewater and groundwater remediation wastewater. 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 1 Flow 0.72 MGD Daily Estimate 2 Effluent pH 3 6.0<pH<9.0 S.U. Weekly Grab Effluent Temperature, °C Weekly Grab Effluent Total Suspended Solids 4 30.0 mg/L 100.0 mg/L Weekly Grab Effluent Oil and Grease 15.0 mg/L 20.0 mg/L Weekly Grab Effluent Total Aluminum 385.1 mg/L 385.1 mg/L Weekly Grab Effluent Total Nickel 1.48 mg/L 16.3 mg/L Weekly Grab Effluent Total Selenium 0.30 mg/L 2.73 mg/L Weekly Grab Effluent Total Mercury 5 47 ng/L, annual average 5 Weekly Grab Effluent Turbidity6 50 NTU Weekly Grab Effluent Total Arsenic, µg/L Weekly Grab Effluent Total Beryllium, µg/L Weekly Grab Effluent Total Copper, µg/L Weekly Grab Effluent Total Lead, µg/L Weekly Grab Effluent Total Silver, µg/L 7 Weekly Garb Effluent Total Zinc, µg/L Weekly Grab Effluent Sulfates,mg/L Weekly Grab Effluent Total Dissolved Solids,mg/L Weekly Grab Effluent Chronic Toxicity 8 Monthly Grab Effluent Total Hardness, mg/L Quarterly Grab Effluent Conductivity, µmhos/cm Quarterly Grab Effluent Nitrite/Nitrate as N,mg/L Quarterly Grab Effluent Total Kjeldahl Nitrogen, mg/L Quarterly Grab Effluent Total Nitrogen,mg/L 9 Quarterly Grab Effluent Total Phosphorus, mg/L Quarterly Grab Effluent Notes: 1. Effluent=comingled sample of the treatment facility's treated wastewater. 2. Flow estimate can be based on pumping log if pumps are in service at time of flow. If flow is occurring with no pumps operating then flow measurement is required by using a V-notch weir, stop watch and calibrated cylinder,or other methods approved by the Division(such as flow sensor devices). 3. The facility shall continuously monitor pH when dewatering process commences and the pump shall be shutoff automatically when the 15 minutes running average pH falls below 6.1 standard units or rises above 8.9 standards 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. In the event of a shut-off of the dewatering pumps, Page 11 of 23 Permit NC0003433 due to continuous monitoring of pH, dewatering may continue once the results of operational samples show the wastewater is back to within the allowable range of the 15 minutes running average for pH. 4. The facility shall continuously monitor TSS concentration when the dewatering process commences and the pump shall be shutoff automatically when the 15 minutes running average exceeds 50 mg/L. 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. In the event of a shut-off of the dewatering pumps, due to continuous monitoring of TSS,dewatering may continue once the results of operational samples show the wastewater is back to within the allowable range of the 15 minutes running average for TSS. 5. The facility shall use EPA method 1631E. Annual average shall be the calendar year. 6. 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)). 7. Total Silver shall be measured to a Practical Quantitation Level of 1.0 tg/L. 8. Chronic Toxicity(Ceriodaphnia dubia) at 1.7%; See Special Condition A. (11.). 9. Total Nitrogen =Total Kjeldahl Nitrogen+ Nitrate/Nitrite as N. b. When the facility commences the ash pond/ponds decanting/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 Raleigh Regional Office, in writing, within seven calendar days of installing additional physical- chemical treatment at this Outfall. c. Dewatering is the removal of interstitial water starting when the free water level in the settled ash basin is less than 3 feet, or if the water level is more than 3 feet above the ash starting when mechanical disturbance of the ash occurs. The limits and conditions in A. (6.) shall remain enforced until all ash basins dewatering is completed. d. If one of the pollutants (As, Se, Hg, Ni, and Pb) reaches 85% of the allowable level during the decanting/dewatering, the facility shall immediately discontinue discharge of the wastewater and report it to the Regional Office and Complex NPDES Permitting Branch via telephone and e-mail. e. The facility shall submit written notification to the DWR Complex NPDES Permitting Unit and the DWR Raleigh Regional Office of the intent to begin the addition of groundwater remediation wastewater to the ash basins treatment facility's influent in conjunction with ash basin dewatering wastewater, seven calendar days prior to commencing the addition. See Special Condition A. (18.) for further requirements. f. 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. g. If no discharge occurs during the reporting period the Permittee shall submit its DMR (eDMR), as required, and indicate "No Flow" (15A NCAC 02B .0506(a)(1)(E)). h. There shall be no discharge of floating solids or visible foam in other than trace amounts. Page 12 of 23 Permit NC0003433 A. (7.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS—Outfall 008 (ground water remediation) [15A NCAC 02B .0400 et seq., 02B .0500 et seq.] a. During the period beginning with the completion/termination of all ash pond dewatering activities,and lasting until permit expiration,the Permittee is authorized to discharge from Outfall 008 treated groundwater remediation wastewater. 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 Frequency Type Location Floe 0.72 MGD Weekly Continuous I Effluent <pH<9.0 S.U. WeeklyGrab Effluent 6.0 pH Temperature, °C Weekly Grab Effluent Total Suspended Solids 30.0 mg/L 45.0 mg/L Weekly Grab Effluent Oil and Grease 15.0 mg/L 20.0 mg/L Weekly Grab Effluent Total Aluminum 385.1 mg/L 385.1 mg/L 2/Month Grab Effluent Total Nickel 1.48 mg/L 16.3 mg/L 2/Month Grab Effluent Sulfates 14,811 mg/L 14,811 mg/L 2/Month Grab Effluent Turbidity 2 50 NTU 2/Month Grab Effluent Total Mercury, ng/L 3 2/Month Grab Effluent Total Arsenic, µg/L 2/Month Grab Effluent Total Beryllium, pg/L 2/Month Grab Effluent Total Lead, pg/L 2/Month Grab Effluent Total Selenium, pg/L 2/Month Grab Effluent Total Silver, µg/L 4 2/Month Grab Effluent Total Zinc, pg/L 2/Month Grab Effluent Total Dissolved Solids, mg/L 2/Month Grab Effluent Total Hardness,mg/L Quarterly Grab Effluent Chronic Toxicity 5 Quarterly Grab Effluent Conductivity, µmhos/cm Quarterly Grab Effluent Nitrite/Nitrate as N,mg/L Quarterly Grab Effluent Total Kjeldahl Nitrogen,mg/L Quarterly Grab Effluent Total Nitrogen,mg/L 6 Quarterly Grab Effluent Total Phosphorus,mg/L Quarterly Grab Effluent Notes: 1. Continuous flow measurement is required by using a calibrated V-notch weir,meter,or other methods approved by the Division(such as flow sensor devices). 2. 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)). 3. The facility shall use EPA method 1631E. 4. Total Silver shall be measured to a Practical Quantitation Level of 1.0 µg/L. Page 13 of 23 Permit NC0003433 5. Chronic Toxicity (Ceriodaphnia dubia) at 1.7% in February, May, August, and November; See Special Condition A. (10.). 6. Total Nitrogen =Total Nitrogen + Nitrate/Nitrite as N. g Kjeldahlg b. The facility shall submit written notification to the DWR Complex NPDES Permitting Unit and the DWR Raleigh Regional Office of the intent to continue groundwater wastewater addition to the treatment facility's influent after the completion/termination of all ash basins dewatering activities, seven calendar days prior to completion and termination of all ash basin dewatering. See Special Condition A. (18.) for further requirements. c. If no discharge occurs during the reporting period the Permittee shall submit its DMR (eDMR), as required, and indicate "No Flow" (15A NCAC 02B .0506(a)(1)(E)). d. There shall be no discharge of floating solids or visible foam in other than trace amounts. Page 14 of 23 Permit NC0003433 A. (8.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS —Outfall 008A [15A NCAC 02B .0400 et seq., 02B .0500 et seq.] a. During the period beginning on the effective date of this permit and lasting until expiration, the Permittee is authorized to discharge' from Internal Outfall 008A on an emergency basis 1963/1970 Ash Basin decanting wastewater in excess of the facility's treatment capacity (> 0.72 MGD)to mitigate an eminent 1963/1970 Ash Basin overflow. Such discharges shall be limited and monitored by the Permittee as specified below: LIMITS MONITORING REQUIREMENTS EFFLUENT CHARACTERISTICS Monthly Daily Measurement Sample Sample Average Maximum Frequency Z Type Location Flow Daily Episod d Even t rin Estimate Effluent cNotes 1. The Permittee shall notify the Raleigh Regional Office (919) 791- 4200 no later than the end of the next business day of the occurrence of an emergency discharge event including time of occurrence, duration, and cause. 2. During the duration of an emergency discharge event, the flow shall be reported daily. b. Upon the occurrence of an emergency overflow event where Outfall 008 requirements for either A. (5.) or A. (6.) have not commenced, Outfall 008 effluent sampling and reporting shall commence immediately for the limited parameters listed in A. (4.) except for Chronic Toxicity and Mercury, and shall continue once per week for the duration of the emergency discharge event. This action does not contravene A. (4.) requirements for decanting. Upon the occurrence of an emergency overflow event where Outfall 008 requirements for either A. (5.) or A (.6.) are enforced no additional monitoring is required. c. There shall be no discharge of floating solids or visible foam in other than trace amounts. Page 15 of 23 Permit NC0003433 A. (9.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS—Outfall 009 (Beneficiation miscellaneous wastewater) [15A NCAC 02B .0400 et seq., 02B .0500 et seq.] a. During the period beginning on the effective date of this permit and lasting until expiration, the Permittee is authorized to discharge episodic beneficiation process area miscellaneous wastewater (ash pile run off, wash water, captured dust spills) from Outfall 009. 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 Frequency Type Location I Flow 0.005 MGD Monthly Estimate 2 Effluent Temperature, °C Monthly Grab Effluent pH 6.0<pH<9.0 S.U. Monthly Grab Effluent Total Suspended Solids 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 Turbidity 3 50 NTU Monthly Grab Effluent Total Mercury 4 47 ng/L, annual average Monthly Grab Effluent Total Arsenic, .tg/L Monthly Grab Effluent Total Selenium, µg/L Monthly Grab Effluent Notes: 1. Effluent=comingled sample of facility treated wastewater. 2. Flow estimate can be based on pumping log if pumps are in service at time of flow. If flow is occurring with no pumps operating then flow measurement is required by using a V-notch weir, stop watch and calibrated cylinder, or other methods approved by the Division (such as flow sensor devices). 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 shall be the calendar year. b. If no discharge occurs during the reporting period the Permittee shall submit its DMR (eDMR), as required, and indicate"No Flow" (15A NCAC 02B .0506(a)(1)(E)). c. There shall be no discharge of floating solids or visible foam in other than trace amounts. Page 16 of 23 Permit NC0003433 A.(10.) CHRONIC TOXICITY LIMIT-Outfalls 007 and 008 (Quarterly) [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 90% for Outfall 007 and 1.7% for Outfall 008. The permit holder shall perform, at a minimum, quarterly monitoring using test procedures outlined in the "North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised December 2010, or subsequent versions or "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised- December 2010) or subsequent versions. The tests will be performed during the months of February, May, August, and November. These months signify the first month of each three-month toxicity testing quarter assigned to the facility. Effluent sampling for this testing must be obtained during representative effluent discharge and shall be performed at the NPDES permitted final effluent discharge below all treatment processes. If the test procedure performed as the first test of any single quarter results in a failure or ChV below the permit limit, then multiple-concentration testing shall be performed, at a minimum, in each of the two following months as described in"North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised-December 2010) or subsequent versions. All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge Monitoring Form(MR-1) for the months in which tests were performed,using the parameter code TGP3B for the pass/fail results and THP3B for the Chronic Value. Additionally, DWR Form AT-3 (original)is to be sent to the following address: Attention: North Carolina Division of Water Resources Water Sciences Section/Aquatic Toxicology Branch 1621 Mail Service Center Raleigh,NC 27699-1621 Completed Aquatic Toxicity Test Forms shall be filed with the Water Sciences Section no later than 30 days after the end of the reporting period for which the report is made. Test data shall be complete, accurate, include all supporting chemical/physical measurements and all concentration/response data, and be certified by laboratory supervisor and ORC or approved designate signature. Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for disinfection of the waste stream. Should there be no discharge of flow from the facility during a month in which toxicity monitoring is required, the Permittee will complete the information located at the top of the aquatic toxicity (AT) test form indicating the facility name, permit number, pipe number, county, and the month/year of the report with the notation of"No Flow"in the comment area of the form. The report shall be submitted to the Water Sciences Section at the address cited above. Should the Permittee fail to monitor during a month in which toxicity monitoring is required, monitoring will be required during the following month. Assessment of toxicity compliance is based on the toxicity testing quarter, which is the three month time interval that begins on the first day of the month in which toxicity testing is required by this permit and continues until the final day of the third month. Should any test data from this monitoring requirement or tests performed by the North Carolina Division of Water Resources indicate potential impacts to the receiving stream, this permit may be re-opened and modified to include alternate monitoring requirements or limits. Page 17 of 23 Permit NC0003433 NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism survival, minimum control organism reproduction, and appropriate environmental controls, shall constitute an invalid test and will require immediate follow-up testing to be completed no later than the last day of the month following the month of the initial monitoring. A. (11.) CHRONIC TOXICITY LIMIT- Outfalls 007 and 008 (Monthly) [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 90% for Outfall 007 and 1.7% for Outfall 008. The permit holder shall perform, at a minimum, monthly monitoring using test procedures outlined in the "North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised December 2010, or subsequent versions or "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised- December 2010) or subsequent versions. Effluent sampling for this testing must be obtained during representative effluent discharge and shall be performed at the NPDES permitted final effluent discharge below all treatment processes. If the test procedure performed as the first test of any 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,NC 27699-1621 Completed Aquatic Toxicity Test Forms shall be filed with the Water Sciences Section no later than 30 days after the end of the reporting period for which the report is made. Test data shall be complete, accurate, include all supporting chemical/physical measurements and all concentration/response data, and be certified by laboratory supervisor and ORC or approved designate signature. Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for disinfection of the waste stream. Should there be no discharge of flow from the facility during a month in which toxicity monitoring is required, the Permittee will complete the information located at the top of the aquatic toxicity (AT) test form indicating the facility name, permit number, pipe number, county, and the month/year of the report with the notation of"No Flow"in the comment area of the form. The report shall be submitted to the Water Sciences Section at the address cited above. 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. Page 18 of 23 Permit NC0003433 NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism survival, minimum control organism reproduction, and appropriate environmental controls, shall constitute an invalid test and will require immediate follow-up testing to be completed no later than the last day of the month following the month of the initial monitoring. A. (12.)ADDITIONAL CONDITIONS AND DEFINITIONS [NCGS 143-213.3 (a) (2) and NCGS 143-213.66] 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 1631 E). 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 mean 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 methods approved by the Division(such as flow sensor devices). 7. The term "FGD wet scrubber wastewater" means wastewater resulting from the use of the flue-gas desulfurization wet scrubber. 8. There shall be no discharge of polychlorinated biphenyl compounds. 9. The permittee shall report the presence of cenospheres observed in any samples on the DMRs in the comment section. 10. 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. (13.) INSTREAM MONITORING [G.S. 143-215.3 (a) (2), G.S. 143-215.66] The facility shall conduct monthly 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),temperature,turbidity, and total dissolved solids(TDS). The monitoring results shall be reported on the facility's Discharge Monitoring Reports and included with the NPDES permit renewal application. Instream Sample Description Location Upstream Outfall 008 0.9 miles upstream from Outfall 008 in Cape Fear River Downstream Outfall 008 Approximately 250 meters downstream from Outfall 008 in Cape Fear River Instream monitoring is provisionally waived considering the permittee's participation in the Middle Cape Fear River Basin Association provided the Association agrees to sample for all the parameters listed in this condition and at the specified locations.Instream monitoring shall be conducted as stated in this permit should the permittee end its participation in the Association. Page 19 of 23 Permit NC0003433 A. (14.) STRUCTURAL INTEGRITY INSPECTIONS OF ASH BASIN DAM [15A NCAC 02K .0208] The facility shall meet the dam design and dam safety requirements per 15A NCAC 2K. A. (15.) FISH TISSUE MONITORING NEAR ASH BASIN DISCHARGE OUTFALL 008 [NCGS 143-215.3(a)(2)] The facility shall conduct fish tissue monitoring annually and submit the results with the NPDES permit renewal application. The objective of this monitoring is to evaluate potential uptake of pollutants by fish tissue near the ash pond discharge. The parameters analyzed in fish tissue shall include arsenic, selenium, and mercury. The monitoring shall be conducted in accordance with the sampling plan approved by the Division.The plan should be submitted to the Division within 180 days from the effective date of the permit. Upon approval, the plan becomes an enforceable part of the permit. Copies of 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) andtHard Copy Division of Water Resources Water Sciences Section 1623 Mail Service Center Raleigh,NC 27699-1623 A. (16.) 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. A. (17.) APPLICABLE STATE LAW (State Enforceable Only) [NCGS 143-215.1(b)] This facility shall meet the General Statute requirements under NCGS § 130A-309.200 et seq. This permit may be reopened to include new requirements imposed under these Statutes. Page 20 of 23 Permit NC0003433 A.(18.)ADDITION OF OTHER WASTEWATERS TO ASH BASIN TREATMENT SYSTEM [G.S. 143-214.1 (a)] The Permittee may introduce on-site groundwater remediation wastewater as an additional influent to the 0.72 MGD capacity treatment system discharging only to Outfall 008 provided it does not result in violation of NC water quality standards or EPA criteria. If necessary the Permittee shall determine what additional treatment is required and then have operational prior to the addition of ground water wastewater. The Permittee shall submit to the Division EPA Form 2C for the ground water wastewater addition no later than 180 days after the introduction of the ground water wastewater to the treatment systems. The Division may open upon further evaluation the permit and assign additional effluent limits or conditions. A. (19.) 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. This special condition supplements or supersedes the followingsections within Part II of this NOTE: p pp p 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 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. Page 21 of 23 Permit NC0003433 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 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: Page 22 of 23 Permit NC0003433 http://deq.nc.gov/about/divisions/water-resources/edmr 4. Signatory Requirements [Supplements Section B. (11.) (b) and Supersedes Section B. (11.) (d)l All eDMRs submitted to the permit issuing authority shall be signed by a person described in Part 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." 5. Records Retention [Supplements Section D. (6.)1 The permittee shall retain records of all Discharge Monitoring Reports, including eDMR submissions. These records or copies shall be maintained for a period of at least 3 years from the date of the report. This period may be extended by request of the Director at any time [40 CFR 122.41]. Page 23 of 23 Permit NC0003433 �.\\;• =tea "p •' � , 4.. l l., ��:� , f �-� l i 1 1 ' !) $ ► , , i . .` \ moo*, jL l_� • Sri . 1 ;LI ,: . .// '.4,..„ r1 ,- 1 \ �' •,v• ! Constructed See• S-OS C‘ r 1°Iiir P Ilrfilla 1 \ i ''' ..,'::ti" tif ,. , .___ ' \ 11%. .. _ il ae Outfall 009 11 1 'p'• ~' ; (' "� f _ Internal Outfall 005 r Q/j - ' I ''. IlliL\'‘. ‘ 1111 aki12111111:fr. ..._ ,--/-1k- --.4(-- Internal Outfall1 �� ,\.,, • • •,. . — wri "g, - ,}- .moo �� l �• a'5 �J, , ._ \`� \ \ ��'_ �•, ... 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SCALE: 1:24000 USGS Quad: E22SE Moncure,NC Outfall 007 Outfall 008 Outfall 009 Latitude: 35° 35'3"N 35° 35'37.7" N 35° 35' 37.9" N it -44111111F Longitude: 79° 2'27" W 79° 3'4.6" W 79° 3'4.1" W Stream Class: WS-IV Facility Location North Subbasin: 03-06-07 HUC: 03030002 Cape Fear Steam Electric Plant NC0003433 Receiving Stream: Cape Fear River Chatham County NOTE t 1.AERIAL PHOTOGRAPHY OBTAINED FROM GOOGLE EARTH PRO • ON SEPTEMBER 11,2017.AERIAL DATED OCTOBER 24,2016. ,r. _ r �� 9 . . 1 t F 9 -' i 4 1956 ASH . , V*,✓.. IF i . ti BASIN 4 l , C . A fr. ` ;_ 4 : :, . 1978 ASH `''`0 `i x �, =1963:ASH Z. BASIN .r�r'�''„ . �Y'` I BASIN , ,'',,4 ' I rwi• • . - - 7 < e i1970 ASH �4 • : BASIN .' x , 400 200 0 400 800 FIGURE 1 ,• -•, GRAPHIC SCALE IN FEET WASTE AND COMPLIANCE BOUNDARIES LEGEND '`.... _ ....�10 �REEN��uE,SOU H CAROLNA 29601 CAPE FEAR PLANT 1ASH BASIN WASTE BOUNDARY PHONE 8644219999 DUKE ENERGY PROGRESS, LLC MASH_ �M��//��Terra RO BASIN COMPLIANCE BOUNDARY ,r DRAWN BY:A.FEIGL DATE:02/08/2018 MONCURE, NORTH CAROLINA r , ,.. .� - PROTECT MANAGER:K.WE88 JPLANT BOUNDARYCHECKED Y B.MILLER -1: + P%Duke Ene• P ress 1026%500 Client Marne Prrde,100 ALL SITES\GIS\Ca. ear Mod:Sed 20100207.mxd B' M DEQ/DWR FACT SHEET FOR NPDES PERMIT DEVELOPMENT NPDES PERMIT NC0003433 Facility Information Applicant/Facility Name: Duke Energy Progress LLC—Cape Fear Steam Electric Plant (decommissioned) Applicant Address: 500 CP&L Road, Moncure,NC 27599 _ Facility Address: 500 CP&L Road, Moncure,NC 27599 Permitted Flow: Outfall 007—0.73 MGD Daily Maximum Outfall 008—0.72 MGD Daily Maximum Outfall 009—0.005 MGD Type of Waste: 100% Industrial (Ash basin clean up, remediation) Facility/Permit Status: Class II/Renewal and Major Modification SIC 4911 County: Chatham Miscellaneous Receiving Stream Index 7Q10s QA IWC (cfs) (cfs) (7Q10s) Outfall 007—Unnamed tributary to Cape Fear River 18-(1) 0 0 100% Outfalls 008 & 008A—Cape Fear River 18-(1) 65 3,170 1.7% Outfall 009—Cape Fear River 18-(1) 65 3,170 0.012% Outfalls 001 &005—Internal Outfalls Stream Classification: WS-IV Regional Office: Raleigh 303(d) Listed?: No USGS Topo Quad: E22SE Moncure,NC HUC No.: 03030002 Permit Writer: Bing Bai Subbasin: 03-06-07 Date: June 3,2018 Cape Fear River Stream Statistics—2016 Drainage(mi2): - Summer—7Q10(cfs): 65 Winter—7Q10 (cfs): 89 30Q2 (cfs): 150 QA (cfs): 3,1701 1. Based on USGS recommendation and data Current Status Duke Energy's ceased operation of its combined 400 megawatts,coal-fire and combustion turbine, Cape Fear Steam Electric Plant in 2011. The plant was dismantled and no longer withdraws water from the Cape Fear River nor discharges wastewater as defined for an active operation of a steam electric generation facility.Historically,there were five ash basins,some of which contain a visible water level. As part of the current active NPDES issued in 2011, storm water was separated and is covered under its own permit. In July 2014 Duke Energy submitted a modification application to amend permit conditions to address operation changes and update identified seeps. Duke Energy requested in February 2016 the current modification application under review be accepted as the required permit renewal application.As part of the required data to develop the permit, Duke provided documents and data associated with identified seeps, ash basin bulk water decanting/dewatering analyses, and landfill leachate analyses. Additional groundwater monitoring well analyses were obtained from the Division's ground water unit. Based on the application amendments and data submitted through August 2016, and applicable Division guidance for this type facility, the initial draft permit was Pagel of 16 NPDES PERMIT FACT SHEET Duke Energy Progress LLC- Cape Fear Facility Page 2 NPDES No. NC0003433 issued October 5,2016 with a public hearing held November 28,20016.The hearing officer extend the deadline for receiving public comments to December 5, 2016. The hearing officer final report was delayed pending resolution of compliance boundary issues and changes in seep permitting requirements, and was issued March 2018. The following recommendation from the hearing officer report will be implemented in this draft: 1) There will be only a single treatment system for decanting, dewatering, and groundwater remediation with a rated capacity of 0.72 MGD. 2) All required sampling types will be grab. 3) There will be no monitoring requirements for iron or magnesium. 4) Will revise the instream monitoring special condition to allow sampling to be done by the Middle Cape Fear Basin Association provided it is conducted at the locations specified in this permit. 5) Will apply USGS based flow information for this segment of the Cape Fear River to establish 7Q10, 30Q2, and QA based IWC values for Outfall 008. 6) Will re-evaluate limit requirements as determined by an RPA applying the new implemented IWC values for Outfall 008. 7) Will decrease Chronic Toxicity monitoring frequency when decanting to quarterly. 8) Revised flow measurement type to include pump logs when applicable but must use other methods defined in permit when discharge occurs and no pump are running. The facility began a Division approved ash basin decanting as approved and defined in the Division's December 2015 and July 2016 letters. Discharge of treated decanting wastewater was allowed through existing Outfalls 001,005,and 007 with weekly monitoring for arsenic,selenium, mercury, chromium, lead, cadmium, copper zinc, and total dissolved solids. The decanting-based discharge cannot contravene NC Water Quality Standards(WQS)or EPA criteria. Based on additional changes the Division determined a second draft for public comment was necessary. These changes include using USGS combined upstream flow criteria for this segment of the Cape Fear River to define instream waste concentration, adding a new outfall for proposed beneficiation facility miscellaneous wastewater discharge, removing landfill leachate wastewater criteria from outfall wastewater characterization as no landfill was to be built,limiting treated ash basin wastewater discharge to decanting only for Outfall 007, adding a ground water boundary compliance map, and implementing permit conditions for the Division updated seep strategy. The following is a summary of the final revisions from the active permit reflected in this second draft, the majority of which were originally proposed in the first draft; • Activation of the former 1963/1970 ash basin stormwater Outfall 008 as an NPDES outfall for discharging treated ash basins decanting/dewatering/groundwater remediation wastewater from a treatment facility with a stated maximum design capacity of 0.72 MGD to the Cape Fear River. • Approval to discharge treated ash basin's decanting wastewater from a treatment facility with a stated maximum design capacity of 0.72 MGD, defined engineering seeps, and the episodic emergency discharge from internal Outfalls 001 and 005,to the existing facility's effluent channel Outfall 007. • Approval to discharge 0.005 MGD of beneficiation miscellaneous wastewater from a new Outfall 009 to the Cape Fear River. • Approval to relocate Outfall 005 to a different location on the effluent channel. NPDES PERMIT FACT SHEET Duke Energy Progress LLC- Cape Fear Facility Page 3 NPDES No. NC0003433 • Provisions to allow for the discharge of treated decanting wastewater to Outfall 008. • Provisions to allow for the discharge of treated dewatering wastewater to Outfall 008. • Provisions to allow for the discharge of combined treated dewatering and treated groundwater remediation wastewater to Outfall 008. • Provisions to allow for the discharge of treated groundwater remediation wastewater to Outfall 008, once all dewatering activity is completed. • Provisions for repurposing existing Internal Outfalls 001 and 005 as emergency only overflow discharges for 1985 (East) and1978 (West) Ash Basins decanting wastewater to the existing facility's effluent channel Outfall 007. • Provisions for a new emergency only overflow Outfall 008A for 1963/1970 Ash Basin for discharging decanting wastewater to the Cape Fear River. • Determination of constructed seep (French Drain) status, location, and entry point into effluent channel. • Removal of all permit conditions associated with the operation of an Electric Generation Steam Plant that are no longer applicable. The modified facility will have permitted discharges to two stream locations,an unnamed tributary to the Cape Fear River and directly to the Cape Fear River. All streams are classified as WS-IV and are not listed as impaired on the 2014 303(d)impairment list. Based on review of USGS 2016 recommendation, Outfall 007 receiving stream,the unnamed tributary to the Cape Fear River,has a 7Q10 summer flow considered to be "zero". USGS recommended using 65 cfs flow to approximate the 7Q10 summer and 95 cfs flow to approximate the 7Q10 winter for this portion of the Cape Fear River that are the receiving stream for Outfalls 008 and 009. Additional stream data was used from other nearby NPDES facilities and USGS gauge stations to determine 30 Q2 and QA flows for this segment of the Cape Fear River. This facility is subject to NC Senate Bill 729 (Coal Ash Management Act). Outfall Description for Proposed Permit Internal Outfall 001 — 1978 (West)Ash Basin This existing outfall will be re-designated as requested by the Permittee as an emergency overflow discharge only. This will be limited to discharging excess 1978 ash basin decanting wastewater above the available treatment plant capacity during an eminent threat of 1978 (West) Ash Basin overflow to the facility's effluent channel. The channel discharges through Outfall 007. Internal Outfall 005— 1985 (East)Ash Basin This existing outfall will be relocated and re-designated as requested by the Permittee as an emergency overflow discharge only. This will be limited to discharging excess 1985 ash basin decanting wastewater above the available treatment plant capacity during an eminent threat of 1985 (East) Ash Basin overflow to the facility's effluent channel. The channel will continue to discharge through Outfall 007. Outfall 007 - Combined Wastewater This existing outfall will be re-designated as a comingled wastewater discharge as requested by the Permittee consisting of treated decanting wastewater from the 0.72 MGD capacity treatment facility, area storm water, approved constructed seep, and episodic emergency discharge from Internal Outfalls 001 and 005. Outfall 007 discharges is to an unnamed tributary to the Cape Fear River. NPDES PERMIT FACT SHEET Duke Energy Progress LLC- Cape Fear Facility Page 4 NPDES No. NC0003433 Outfall 008 -Combined Wastewater This outfall was a previous retired 1963/1970 Ash Basin storm water outfall and as requested by the Permittee will be re-activated as a NPDES discharge. It will be designated for comingled wastewater discharge consisting of treated wastewater from the 0.72 MGD capacity treatment facility for either decanting/dewatering/groundwater remediation. Outfall 008 discharges to the Cape Fear River. Outfall 008A- 1963/1970 Ash Basin This will be a new outfall requested by the Permittee and will be designated as an emergency discharge only. This will be limited to discharging excess 1963/1970 ash basin decanting wastewater above the available treatment plant capacity during an eminent threat of 1963/1970 Ash Basin overflow to the Cape Fear River. Outfall 009—Beneficiation Area Miscellaneous Wastewater This will be a new outfall requested by the Permittee to address 0.005 MGD of potential miscellaneous wastewater that may occur in the Beneficiation process consisting of ash pile runoff, dust, and spills. Outfall 009 will discharge to the Cape Fear River. Internal Outfall S-05—Constructed Seep (French Drain) This internal outfall is for discharge of combined French Drain to effluent channel of Outfall 007. Compliance Review During this permit cycle while operating as a steam electric generating facility up to shutting down in May 2014,the facility had two TSS limit violations on Internal Outfall 005 and some monitoring frequency violations. No fines were assessed. 0 A total of 11 chronic toxicity tests at 90% effluent concentration using ceriodaphnia dubia were performed and passed. During this permit cycle samples were taken from 13 monitoring wells for 22 parameters 3/Year. Groundwater violations were noted for Total Manganese, Total Iron, Total Boron, Total Vanadium, TSS, Total Cobalt, Sulfates, Total Selenium, Total Cadmium, Total Chromium, and Total Thallium. As required the Permittee is preparing an Action Plan to address groundwater remediation and a compliance boundary map that will be submitted to the Groundwater Protection Branch for final approval. The map will be attached to the final NPDES permit. Instream Monitoring As part of the required site seep investigation and reporting, instream samples were taken in July 2014 in the Haw River at the mouth of Shaddox Creek, upstream in Shaddox Creek, in the Cape Fear River just upstream of the mouth of the unnamed tributary that receives flow from Outfall 007, and in the Cape Fear River approximately 1.9 miles downstream from the mouth of the unnamed tributary. There was a notable reduction in impact to the concentration of the measured constituents that entered Haw River from Shaddox Creek most likely from dilution.The Cape Fear River samples did not show any significant differences.There were no reported values that violated NC water quality standards or EPA criteria. NPDES PERMIT FACT SHEET Duke Energy Progress LLC- Cape Fear Facility Page 5 NPDES No. NC0003433 Fish Tissue Study Near Ash Basins As required a fish tissue study was conducted in the Cape Fear River in May 2014 to evaluate the uptake of arsenic, mercury, and selenium by fish near the ash basin discharge. There were four fish tissue samples out of the thirty-six sample taken, three upstream and one downstream, that were> the Mercury 2006 NC Health Directors Action Advisory Level of 0.4 µg/g fresh weight. The fish tissue samples Mercury levels ranged from < 0.04 to 0.68 µg/g fresh weight. There was no exceedance of the arsenic or the selenium fish tissue fresh weight criteria for any fish tissue sampled. Proposed Permitting Action In accordance with the 2014 Coal Ash Management Act and additional Division approval, the facility began decanting of the ash basins using a 0.72 MGD capacity treatment system.To comply with the remainder of the act,ash basin dewatering and final disposal of the ash must be completed. As part of this renewal and modified permit, requirement will be developed for treated decanting wastewater,treated dewatering wastewater, and in this case a proposed ash disposal Beneficiation process 0.005 MGD waste sources. In addition, the Permittee has requested as part of the permit modification to include groundwater remediation as part of the dewatering activities to be continued once dewatering activities are completed. Under current Division seep strategy only the constructed seep, S-05, that discharges to the effluent channel will be covered under this permit. Outfall 007 This outfall discharges at the end of the effluent channel and to an unnamed tributary with a"zero" 7Q10 summer flow,thus,has an IWC=100%.Base on evaluation of all the contributing wastewater characteristics associated with this outfall, the ash basin decanting waste water source was the most dominant. A reasonable potential analysis was conducted using 0.73 MGD as the estimated flow and using the ash basin bulk water concentration data collected in October 2014. Based on this analysis,the following permitting actions are proposed for this permit: • Effluent Limit with Monitoring. The following parameters will receive a water quality-based effluent limit(WQBEL)since they demonstrated a reasonable potential to exceed applicable water quality standards/criteria: Arsenic,Antimony,Molybdenum,Nickel, Selenium,Zinc • Monitoring Only. The following parameters will receive a monitor-only requirement since they did not demonstrate reasonable potential to exceed applicable water quality standards/criteria, but the maximum predicted concentration was>50%of the allowable concentration: Cadmium, Copper,Fluoride, Sulfates,TDS,Thallium, Lead • No Limit or Monitoring:The following parameters will not receive a limit or monitoring, since they did not demonstrate reasonable potential to exceed applicable water quality standards/criteria and the maximum predicted concentration was<50%of the allowable concentration: Chlorides,Aluminum,Chromium III,Chromium VI,Total Chromium,Barium To comply with mercury TMDL requirements and minimum ash basin decanting monitoring requirements,monthly monitoring using test method 1631 E, or equivalent, will be required, with an annual average limit of 12 ng/L. Additional decanting monitoring parameters and conditions and other general permit requirements are summarized in Table 1: Outfall 007—Ash Basin Decanting. Table 1: Outfall 007 -Ash Basin Decanting NPDES PERMIT FACT SHEET Duke Energy Progress LLC- Cape Fear Facility Page 6 NPDES No. NC0003433 Monitoring DMR Monitoring Parameter Requirements Frequency Basis Flow 0.73 MGD DM Daily Decanting strategy, 15A NCAC 2B .0505 6.0<_pH<9.0 S.U. Decanting strategy, pH Continuous Monthly 15A NCAC 2B .0200 monitoring/auto shutoff 30.0 mg/L MA 100 mg/L DM Decanting strategy, TSS Monthly EPA requirement, Continuous 40 CFR 423 monitoring/auto shutoff Oil&Grease 15.0 mg/L MA Monthly Decanting strategy, 20.0 mg/L DM 40 CFR 423 Total Antimony 5.6 µg/L MA Monthly RP to exceed NC WQS and 5.6 µg/L DM EPA criteria Total Arsenic 10.0 µg/L MA Weekly RP to exceed NC WQS and 340.0 µg/L DM EPA criteria Total Molybdenum 160µg/L MA Monthly RP to exceed NC WQS and 160 µg/L DM EPA criteria Total Lead Monitor&Report, µg/L Monthly Pollutant of concern Total Nickel 25.0 µg/L MA Monthly RP to exceed NC WQS and 335.2 µg/L DM EPA criteria Total Selenium 5.0 µg/L MA Weekly RP to exceed NC WQS and 56.0 µg/L DM EPA criteria Total Zinc 125.7 µg/L MA Monthly RP to exceed NC WQS and 125.7 µg/L DM EPA criteria Total Mercury 12 ng/L, annual average Weekly Mercury TMDL Total Cadmium Monitor&Report, µg/L Monthly No RP,predicted value> 50%of the Allowable Cw Total Copper Monitor&Report, µg/L Monthly No RP,predicted value> 50%of the Allowable Cw Fluoride Monitor&Report,mg/L Monthly No RP,predicted value>_ 50%of the Allowable Cw No RP,predicted value> Sulfates Monitor&Report,mg/L Monthly 50%of the Allowable Cw Total Dissolved Monitor&Report,mg/L Monthly No RP,predicted value> Solids 50%of the Allowable Cw Total Thallium Monitor&Report, µg/L Monthly No RP,predicted value>_ 50%of the Allowable Cw Turbidity Net Turbidity<_50 NTU Monthly Decanting strategy, EPA requirement Effluent Hardness Monitor&Report,mg/L Quarterly Required to assess dissolved metal limitations Chronic Toxicity 90%concentration,P/F Quarterly Decanting strategy, DEQ Toxicity Policy Nitrate/Nitrite as N Monitor&Report,mg/L Quarterly Needed to calculate TN Total Kjeldahl Monitor&Report,mg/L Quarterly Needed to calculate TN Nitrogen Total Nitrogen Monitor&Report,mg/L Quarterly 15A NCAC 02B .0500 Total Phosphorus Monitor&Report,mg/L Quarterly 15A NCAC 02B .0500 MGD—Million gallons per day,MA—Monthly Average,DM—Daily Max --- NPDES PERMIT FACT SHEET Duke Energy Progress LLC- Cape Fear Facility Page 7 NPDES No. NC0003433 Outfall 008 -Decanting As requested by the Permittee this new outfall will discharge to a segment of the Cape Fear River and based on stream flow data has a 7Q10 summer IWC = 1.7%. A reasonable potential analysis was conducted using the 0.72 MGD capacity of the treatment as the estimated flow and using the highest bulk water concentration data collected in October 2014. Based on this analysis, the following permitting actions are proposed for this permit: • Effluent Limit with Monitoring. The following parameters will receive a water quality-based effluent limit(WQBEL)since they demonstrated a reasonable potential to exceed applicable water quality standards/criteria: NA • Monitoring Only. The following parameters will receive a monitor-only requirement since they did not demonstrate reasonable potential to exceed applicable water quality standards/criteria, but the maximum predicted concentration was>50%of the allowable concentration: Arsenic, Selenium,Lead,Nickel NOTE:Arsenic and Selenium are major decanting pollutants of concern,weekly monitoring is required.Lead and Nickel are pollutants of concern,monthly monitoring is required. • No Limit or Monitoring: The following parameters will not receive a limit or monitoring, since they did not demonstrate reasonable potential to exceed applicable water quality standards/criteria and the maximum predicted concentration was<50%of the allowable concentration: TDS,Cadmium,Chlorides,Aluminum,Chromium III,Chromium VI,Total Chromium, Copper,Fluoride,Molybdenum,Zinc,Antimony,Barium, Sulfates,Thallium. To comply with mercury TMDL requirements and minimum ash basin decanting monitoring requirements, monthly monitoring using test method 1631 E, or equivalent, will be required, with an annual average limit of 47 ng/L. Additional decanting monitoring parameters and conditions and other general permit requirements are summarized in Table 2: Outfall 008—Ash Basin Decanting. Table 2: Outfall 008 -Ash Basin Decanting Monitoring DMR Parameter Monitoring Basis Requirements Frequency Flow 0.72 MGD DM Dail Decanting strategy, y 15A NCAC 2B .0505 6.0<pH<9.0S.U. pH Continuous Monthly Decanting strategy, monitoring/auto shutoff 15A NCAC 2B .0200 30.0 mg/L MA 100 mg/L DM Decanting strategy, TSS Monthly EPA requirement, Continuous 40 CFR 423 monitoring/auto shutoff Oil&Grease 15.0 mg/L MA Monthly Decanting strategy, 20.0 mg/L DM 40 CFR 423 Total Mercury 47 ng/L,annual average Weekly Mercury TMDL Decanting strategy, Total Arsenic Monitor&Report, µg/LWeekly EPA requirement Decanting strategy, Weekly Total Selenium Monitor&Report, µg/L EPA requirement NPDES PERMIT FACT SHEET Duke Energy Progress LLC- Cape Fear Facility Page 8 NPDES No. NC0003433 Total Lead Monitor&Report, µg/L Monthly Pollutant of concern Total Nickel Monitor&Report, gg/L Monthly Pollutant of concern Turbidity Net Turbidity<50 NTU Monthly Decanting strategy, EPA requirement Effluent Hardness Monitor&Report,mg/L Quarterly Required to assess dissolved metal limitations Chronic Toxicity 1.7%concentration,P/F Quarterly Decanting strategy, DEQ Toxicity Policy Nitrate/Nitrite as N Monitor&Report,mg/L Quarterly Needed to calculate TN Total Kjeldahl Nitrogen Monitor&Report,mg/L Quarterly Needed to calculate TN Total Nitrogen Monitor&Report,mg/L Quarterly 15A NCAC 02B .0500 _ Total Phosphorus Monitor&Report, mg/L Quarterly 15A NCAC 02B .0500 MGD—Million gallons per day,MA—Monthly Average,DM—Daily Max Outfall 008 - Dewatering As requested by the Permittee this new outfall will discharge to a segment of the Cape Fear River and based on stream flow data has a 7Q10 summer-based IWC = 1.7%. A reasonable potential analysis was conducted using the 0.72 MGD capacity of the treatment system as the estimated flow and using the highest 1985(East)and 1978(West)Ash Basins interstitial water concentration data collected in January 2015. Based on this analysis, the following permitting actions are proposed for this permit: • Effluent Limit with Monitoring. The following parameters will receive a water quality-based effluent limit(WQBEL)since they demonstrated a reasonable potential to exceed applicable water quality standards/criteria: Selenium NOTE: Arsenic is a major dewatering pollutant of concern,weekly monitoring is required. • Monitoring Only. The following parameters will receive a monitor-only requirement since they did not demonstrate reasonable potential to exceed applicable water quality standards/criteria, but the maximum predicted concentration was>50%of the allowable concentration: Aluminum, Arsenic,Cadmium,Copper, Lead,Nickel • No Limit or Monitoring: The following parameters will not receive a limit or monitoring, since they did not demonstrate reasonable potential to exceed applicable water quality standards/criteria and the maximum predicted concentration was<50%of the allowable concentration: TDS,Chlorides,Chromium III,Chromium VI,Total Chromium,Fluoride, Molybdenum,Barium, Sulfates,Antimony,Zinc,Thallium To comply with mercury TMDL requirements and minimum ash basin dewatering monitoring requirements, weekly monitoring using test method 1631 E, or equivalent, will be required, with an annual average limit of 47 ng/L. The Permittee shall notify the Raleigh Regional Office and the Division seven calendar days prior to commencing ash basin dewatering operation. Additional dewatering monitoring parameters and conditions and other general permit requirements are summarized in Table 3: Outfall 008—Ash Basin Dewatering. NPDES PERMIT FACT SHEET Duke Energy Progress LLC- Cape Fear Facility Page 9 NPDES No. NC0003433 Table 3: Outfall 008 -Ash Basin Dewatering Monitoring DMR Parameter Requirements Monitoring Basis Frequency Flow 0.72 MGD DM DailyDewatering strategy, 15A NCAC 2B .0505 6.0<_pH<9.0 S.U. Dewatering strategy, pH Continuous Weekly 15A NCAC 2B .0200 monitoring/auto shutoff 30.0 mg/L MA Dewatering strategy, TSS 100 mg/L DM Weekly EPA requirement, Continuous 40 CFR 423 monitoring/auto shutoff Oil&Grease 15.0 mg/L MA Weekly Dewatering strategy, 20.0 mg/L DM 40 CFR 423 Total Aluminum Monitor&Report,mg/L Weekly No RP,predicted Cw>_50% of Allowable Cw Total Arsenic Monitor&Report, µg/L Weekly Dewatering strategy, EPA requirement Total Cadmium Monitor&Report, µg/L Weekly No RP,predicted Cw>_50% of Allowable Cw Total Copper 466.9 µg/L MA Weekly RP to exceed NC WQS and 509.9µg/L DM EPA criteria Total Lead 0.17 mg/L MA Weekly RP to exceed NC WQS and 3.68 mg/L DM EPA criteria Total Mercury 47 ng/L, annual average Weekly Mercury TMDL Total Nickel Monitor&Report, µg/L Weekly Pollutant of concern Total Selenium 0.30 mg/L MA Weekly RP to exceed NC WQS and 2.73 mg/L DM EPA criteria Turbidity Net Turbidity 50 NTU Weekly Decanting strategy, EPA requirement Effluent Hardness Monitor&Report,mg/L Quarterly Required to assess dissolved metal limitations Chronic Toxicity 1.7%concentration,P/F Monthly Dewatering strategy, DEQ Toxicity Policy Nitrate/Nitrite as N Monitor&Report,mg/L Quarterly Needed to calculate TN Total Kjeldahl Nitrogen Monitor&Report,mg/L Quarterly Needed to calculate TN Total Nitrogen Monitor&Report,mg/L Quarterly 15A NCAC 02B .0500 Total Phosphorus Monitor&Report,mg/L Quarterly 15A NCAC 02B .0500 MGD—Million gallons per day,MA—Monthly Average,DM—Daily Max Outfall 008—Dewatering/Ground Water Remediation As requested by the Permittee this new outfall will discharge to a segment of the Cape Fear River, and based on stream flow data and a maximum 0.72 MGD treatment system capacity has a 7Q10 summer-based IWC = 1.7%. A reasonable potential analysis was conducted using the 1.7% and using two source data points if available, one data point from the highest 1985 (East) and 1978 (West) Ash Basins interstitial water concentration data collected in January 2015 and a second data point from the highest ground water monitoring wells data collected in 2015 and 2016. Based on this analysis,the following permitting actions are proposed for this permit: • Effluent Limit with Monitoring. The following parameters will receive a water quality-based effluent limit(WQBEL)since they demonstrated a reasonable potential to exceed applicable NPDES PERMIT FACT SHEET Duke Energy Progress LLC- Cape Fear Facility Page 10 NPDES No. NC0003433 water quality standards/criteria: TDS,Aluminum,Copper,Lead,Nickel, Selenium, Silver, Sulfates,Zinc NOTE: Arsenic is a major dewatering pollutant of concern,weekly monitoring is required. • Monitoring Only. The following parameters will receive a monitor-only requirement since they did not demonstrate reasonable potential to exceed applicable water quality standards/criteria, but the maximum predicted concentration was>50%of the allowable concentration: Beryllium, Copper,Cadmium,NOTE: Molybdenum is a major pollutant of interest,will be monitored weekly. • No Limit or Monitoring: The following parameters will not receive a limit or monitoring, since they did not demonstrate reasonable potential to exceed applicable water quality standards/criteria and the maximum predicted concentration was<50%of the allowable concentration: Antimony,Chlorides,Chromium III,Chromium VI,Total Chromium,Fluoride, Barium,Thallium To comply with mercury TMDL requirements and minimum ash basin dewatering monitoring requirements, weekly monitoring using test method 1631E, or equivalent, will be required, with an annual average limit of 47 ng/L. The Permittee shall notify the Raleigh Regional Office and the Division seven calendar days prior to the introduction of remediation ground water with the dewatering wastewater. Additional dewatering monitoring parameters and ground water remediation monitoring parameters and other general permit requirements are summarized in Table 4: Outfall 008 —Ash Basin Dewatering/Ground Water Remediation. Table 4: Outfall 008 -Ash Basin Dewatering/Ground Water Remediation Monitoring DMR Parameter Monitoring Basis Requirements Frequency Flow 0.72 MGD DM Daily Dewatering strategy, 15A NCAC 2B .0505 Ground Water Temperature, °C Monitor&Report Weekly Remediation NCG510000 6.0<pH<9.0 S.U. pH Continuous Weekly Dewatering strategy, monitoring/auto shutoff 15A NCAC 2B .0200 30.0 mg/L MA 100 mg/L DM Dewatering strategy, TSS Continuous Weekly EPA requirement, monitoring/auto shutoff 40 CFR 423 Oil & Grease 15.0 mg/L MA Weekly Dewatering strategy, 20.0 mg/L DM 40 CFR 423 Total Aluminum 385.1 mg/L MA Weekly RP to exceed NC WQS 385.1 mg/L DM and EPA criteria Total Arsenic Monitor&Report, µg/L Weekly Dewatering strategy, EPA requirement No RP,predicted Cw Total Beryllium Monitor& Report, µg/L Weekly 50%of Allowable Cw NPDES PERMIT FACT SHEET Duke Energy Progress LLC- Cape Fear Facility Page 11 NPDES No. NC0003433 No RP,predicted Cw> Total Cadmium Monitor&Report, !AWL Weekly 50%of Allowable Cw Total Copper Monitor&Report, µg/L Weekly No RP,predicted Cw> 50%of Allowable Cw Report, L WeeklyNo RP,predicted Cw> Total Lead Monitor&R ' µ� 50%of Allowable Cw Total Mercury 47 ng/L, annual average Weekly _ Mercury TMDL Total Nickel 1.48 mg/L MA Weekly RP to exceed NC WQS 16.3 mg/L DM and EPA criteria Total Selenium 0.30 mg/L MA Weekly RP to exceed NC WQS 2.73 mg/L DM and EPA criteria Total Silver Monitor&ReportNo RP,predicted Cw> ' µtiL Weekl y 50%of Allowable Cw Report, L WeeklyNo RP,predicted Cw> Total Zinc Monitor&R ' µti 50%of Allowable Cw TDS Monitor&Report,mg/L Weems No RP,predicted Cw> y 50%of Allowable Cw Sulfates Monitor&Report,mg/L WeeklyNo RP,predicted Cw> 50%of Allowable Cw Turbidity Net Turbidity<50 NTU Weekly Dewatering strategy, EPA requirement Effluent Hardness Monitor&Report,mg/L Quarterly Required to assess dissolved metal limitations Chronic Toxicity 1.7%concentration, P/F Monthly Dewatering strategy, DEQ Toxicity Policy Conductivity, Ground Water µmhos/cm Monitor and Report Quarterly Remediation, NCG510000 Nitrate/Nitrite as N Monitor&Report,mg/L Quarterly Needed to calculate TN Total Kjeldahl Nitrogen Monitor&Report,mg/L Quarterly Needed to calculate TN Total Nitrogen Monitor&Report,mg/L Quarterly 15A NCAC 02B .0500 Total Phosphorus Monitor&Report, mg/L Quarterly 15A NCAC 02B .0500 MGD-Million gallons per day,MA-Monthly Average,DM-Daily Max In addition, a special condition will be added to require the Permittee to submit EPA Form 2C to update the ground water remediation characterization 180 days after its initial introduction to the treatment system. The Division may reopen the permit to assign additional limits or conditions Outfall 008-Ground Water Remediation As requested by the Permittee this new outfall will discharge to a segment of the Cape Fear River, and based on stream flow data and a maximum 0.72 MGD treatment system capacity has a 7Q10 summer-based IWC = 1.7%. The reasonable potential analysis was conducted using only the highest ground water monitoring wells data toxicant concentration collected in 2015 and 2016 yielded the same results as the reasonable potential analysis conducted for comingled dewatering and groundwater remediation waste sources. Therefore, the only changes will be the removal of conditions related to dewatering activity, and a reduction in various parameters monitoring frequency and TSS limits to comply with Division ground water remediation permitting strategy. NPDES PERMIT FACT SHEET Duke Energy Progress LLC- Cape Fear Facility Page 12 NPDES No. NC0003433 To comply with mercury TMDL requirements, quarterly monitoring using test method 1631 E, or equivalent,will be required,with an annual average limit of 47 ng/L. The Permittee shall notify the Raleigh Regional Office and the Division seven calendar days prior to the completion of dewatering activities and the continuation of remediation ground water treatment. Ground Water Remediation requirements and conditions are summarized in Table 5: Outfall 008 —Ground Water Remediation. Table 5: Outfall 008 - Ground Water Remediation Monitoring DMR Parameter Requirements Monitoring Basis Frequency Flow 0.72 MGD MA Weekly 15A NCAC 2B .0400 et seq.,02B .0500 et seq. Temperature, °C Monitor&Report Weekly Ground Water Remediation, NCG510000 pH 6.0<pH<9.0 S.U. Weekly 15A NCAC 2B .0200 TSS 30.0 mg/L MA Weekl Ground Water Remediation, 45.0 mg/L DM y NCG510000 Oil&Grease 15.0 mg/L MA Weekly 40 CFR 423 20.0 mg/L DM Total Aluminum 385.1 mg/L MA 2/Month RP to exceed NC WQS and 385.1 mg/L DM EPA criteria No RP,predicted Cw> 50% Total Arsenic Monitor&Report, µg/L2/Month of Allowable Cw No RP,predicted Cw> 50% Total Beryllium Monitor&Report, µg/L 2/Monthof Allowable Cw No RP,predicted Cw> 50% 2/Month Total Lead Monitor&Report, µg/L of Allowable Cw Total Nickel 1.48 mg/L MA 2/Month RP to exceed NC WQS and 16.3 mg/L DM EPA criteria Total Selenium Monitor&Report, µg/L 2/Month No RP,predicted Cw>50% of Allowable Cw Total Silver Monitor&Report, µg/L 2/Month No RP,predicted Cw>50% of Allowable Cw No RP,predicted Cw> 50% 2/Month Total Zinc Monitor&Report, µg/L of Allowable Cw TDS Monitor&Report,mg/L 2/Month No RP,predicted Cw>50% of Allowable Cw Sulfates 14,811 mg/L MA 2/MonthRP to exceed NC WQS and 14,811mg/L DM EPA criteria Turbidity Net Turbidity<50 NTU 2/Month 15 NCAC 2B .0500 Effluent Hardness Monitor&Report,mg/L Quarterly Required to assess dissolved metal limitations Chronic Toxicity 1.7%concentration,P/F Quarterly Dewatering strategy, DEQ Toxicity Policy NPDES PERMIT FACT SHEET Duke Energy Progress LLC- Cape Fear Facility Page 13 NPDES No. NC0003433 Conductivity, µmhos/cm Monitor and Report Quarterly Ground Water Remediation, NCG510000 Nitrate/Nitrite as N Monitor&Report,mg/L Quarterly Needed to calculate TN Total Kjeldahl Nitrogen Monitor&Report,mg/L Quarterly Needed to calculate TN Total Nitrogen Monitor&Report,mg/L Quarterly 15A NCAC 02B .0500 Total Phosphorus Monitor&Report,mg/L Quarterly 15A NCAC 02B .0500 MGD—Million gallons per day,MA—Monthly Average,DM—Daily Max Outfall 009—Beneficiation Miscellaneous Wastewater As requested by the Permittee this new outfall will discharge to a segment of the Cape Fear River, and based on stream flow data and a maximum 0.005 MGD discharge has a 7Q10 summer-based IWC = 0.012%. The expected sources of wastewater from the Beneficiation process area are ash pile run off, truck washing and ash dust spills. Data from an existing similar operation which included 21 toxicants was provided to characterize the proposed Beneficiation waste stream, and used to conducted a reasonable potential analysis. No Limit or Monitoring: The following parameters will not receive a limit or monitoring, since they did not demonstrate reasonable potential to exceed applicable water quality standards/criteria and the maximum predicted concentration was <50% of the allowable concentration: Aluminum, Antimony, Cadmium, Chlorides, Barium, Beryllium, Total Chromium, Copper, Fluoride, Lead, Molybdenum, Nickel, Silver, Thallium, Zinc, Sulfates, TDS NOTE: Monthly monitoring for Arsenic and Selenium will be required as they are toxicants of concern. Beneficiation Miscellaneous requirements and conditions are summarized in Table 6: Outfall 009 —Ground Water Remediation. Table 6: Outfall 009—Beneficiation Miscellaneous Wastewater Monitoring DMR Monitoring Parameter Basis Requirements Frequency Flow 0.005 MGD DM Weekly 15A NCAC 2B .0400 et seq.,02B .0500 et seq. Temperature, °C Monitor&Report Monthly BPJ(untreated waste stream) pH _ 6.0<pH<9.0 S.U. Monthly 15A NCAC 2B .0200 TSS 30.0 mg/L MA Monthl BPJ(untreated waste 30.0 mg/L DM y stream) Oil&Grease 15.0 mg/L MA Monthly 40 CFR 423 20.0 mg/L DM Total Mercury 47 ng/L,annual average Monthly Mercury TMDL Total Arsenic Monitor&Report Monthly Toxicant of concern,BPJ (coal ash source) Total Selenium Monitor&Report Monthly Toxicant of concern,BPJ (coal ash source) Turbidity Net Turbidity<50 NTU Monthly 15 NCAC 2B .0500 MGD—Million gallons per day,MA—Monthly Average,DM—Daily Max NPDES PERMIT FACT SHEET Duke Energy Progress LLC- Cape Fear Facility Page 14 NPDES No. NC0003433 Internal Outfalls 001, 005, and External Outfall 008A - Ash Basins Emergency Overflow Discharge As requested by the Permittee internal outfalls will be permitted for the three ash basins to address potential emergency overflow only events. Outfall 005,an existing 1985 (East)Ash Basin internal outfall, will be relocate to a different section of the effluent channel and be repurposed as an episodic emergency overflow.Outfall 001,an existing 1968(West)Ash Basin internal outfall,will be repurposed as an episodic emergency overflow and continue to discharge to the effluent channel. The 1963/1970 Ash basin will require a new episodic emergency overflow Outfall 008A which will be added to this permit. An emergency discharge is defined as the ash basin decanting wastewater that is in excess of the facility 0.72 MGD treatment capacity that will overflow. Table 6 lists the notification ' and monitoring requirement in the event of ash basin emergency overflow from internal outfalls: Table 6: Ash Basin Emergency Overflow Outfalls 001, 005, 008A Parameter Monitoring Sample Requirements 2 Type Flow Monitor&Report, MGD Estimate Outfall 001(Internal) Monitor&Report Outfall 007 per A. (3.)3 Outfall 005 (Internal) Monitor&Report Outfall 007 per A. (3.) 3 Outfall 008A Monitor&Report Outfall 008 per A. (8.) 3 Notes 1. The Permittee shall notify the Raleigh Regional Office (919) 791 — 4200 no later than the end of the next business day of the occurrence of an emergency discharge event including time of occurrence, duration, and cause. 2. During the duration of a discharge event,the flow shall be reported daily. 3. Effluent monitoring shall commence immediately at the impacted external outfall (Outfalls 007 or 008) for the limited parameters except for Mercury and Chronic Toxicity. Monitoring parameters and continue weekly during the emergency discharge event. Any external outfall's monitoring requirements in effect prior to an emergency discharge shall remain in effect. Instream Monitoring The facility shall conduct representative monthly 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,and total dissolved solids(TDS) at locations list in Table 7. For the purpose of this requirement, semi-annual means that samples are collected twice per year with at least 120 calendar days between sampling events. The monitoring results shall be reported on the facility's Discharge Monitoring Reports and included with the NPDES permit renewal application. Instream monitoring is provisionally waived considering the permittee's participation in the Middle Cape Fear River Basin Association provided the Association agrees to sample for all the parameters listed in this condition and at the specified locations. Instream monitoring shall be conducted as stated in this permit should the permittee end its participation in the Association. NPDES PERMIT FACT SHEET Duke Energy Progress LLC- Cape Fear Facility Page 15 NPDES No. NC0003433 Table 7: Instream Monitoring Locations Instream Sample Description Location Upstream Outfall 008 0.9 miles upstream from Outfall 008 in Cape Fear River Downstream Outfall 008 Approximately 250 meters downstream from Outfall 008 in Cape Fear River Fish Tissue Monitoring The current permit's Fish Tissue Monitoring Near Ash Pond Discharge special condition will be modified to show the submittal of the proposed plan for approval by the Division shall be no later thanl 80 days after the effective date of this permit, and to provide the addresses for submittal of the proposed plan and the subsequent required report. Once the plan is approved it will become an enforceable part of the permit. Removal of Special Conditions No Longer Valid As a result of the decommissioning and removing of the steam and turbine components,removing of the domestic WWTP, and eliminating of other related on-site sources, the following current permit Special Conditions are no longer applicable and will be removed from this permit renewal: - A. (2.) Internal Outfall 003 - A. (6) Intake Screen Backwashing - A. (7.) Biocide Condition - A. (8.)Domestic Wastewater Treatment Plant - A. (10.) Section 316 (b) of CWA Constructed Seep (French Drain) As part of the required effluent channel evaluation completed by the Division on September 2, 2016 and subsequent updates to confirm status of constructed seep, Outfall S-05 is the recognized combined flow of the two French Drain sources that collect in the effluent channel. Table 9: Coordinates and Assigned Outfall list the details related to S-05. The effluent channel flows go to Outfall 007 which discharges to an unnamed tributaryto the Cape Fear River. Table 9: Coordinates and Assigned Outfall Discharge ID Latitude Longitude S-05 35° 35' 25.62"N 79° 2' 46.96"W Summary of Proposed Chances 1. Eliminated the current permit Internal Outfall 003 and its limitation page A. (2.); Special Conditions A. (6.) Intake Screen Backwash, A. (7.) Biocide Condition, A. (8.) Domestic Wastewater Treatment Plant, A. (10.) Section 316(b) of CWA; as they are no longer applicable. 2. Modified Supplement to Permit Cover Sheet to show the new outfalls' configuration. 3. Modified Internal Outfalls 001 and 005 limitation pages [new permit A. (1.) and A. (2.)] to repurpose their monitoring, narrative, and limit requirements for episodic emergency overflow of decanting wastewater from the West and East Ash Basins. Outfall 005 was relocated to different segment of the effluent channel. 4. Modified Outfall 007 limitation page [new permit A. (3.)],discharge to unnamed tributary to the Cape Fear River, to repurpose its monitoring, narrative, and limit requirements for NPDES PERMIT FACT SHEET Duke Energy Progress LLC- Cape Fear Facility Page 16 NPDES No. NC0003433 comingled ash basin treated decanting wastewater and any other collected wastewater in the effluent channel approved by the Division. 5. Added new Outfall 008 limitation pages [new permit A. (4.), A. (5.), A. (6.), A. (7.)], discharge to the Cape Fear River, for monitoring and limit requirements, and applicable narrative conditions, for combination of treated wastewater sources starting with ash basin decanting, followed by ash basin dewatering, followed by the introduction of groundwater remediation in combination with ash basin dewatering, and ending with groundwater remediation only. 6. Added new Outfall 008A limitation page [new permit A. (8.)] for monitoring, narrative, and limit requirements for the episodic emergency overflow of decanting wastewater from the 1963/1970 Ash Basin. 7. Added new Outfall 009 limitation page [new permit A. (9.)], discharge to the Cape Fear River, for monitoring, narrative, and limit requirements for miscellaneous Beneficiation area wastewater. 8. Modified Special Condition A. (10.) Chronic Toxicity Limit (Quarterly) for Outfalls 007 and 008. 9. Added Special Condition A. (11.) Chronic Toxicity Limit (Monthly) for Outfalls 007 and 008. 10. Added Special Condition A. (12.) Additional Conditions and Definitions for other applicable conditions associated with this permit. 11. Added Special Condition A. (13.) Instream Monitoring to implement monthly instream monitoring for Arsenic, Bromide, Cadmium, Chromium, Copper, Hardness, Lead, Mercury, Selenium, Zinc, TDS, Temperature and Turbidity at instream locations on the Cape Fear River. 12. Revised Special Condition A. (14.) Structural Integrity Inspections of Ash Basin Dam. 13. Modified Special Condition A. (15.)Fish Tissue Monitoring Near Ash Basin Discharge to redefine submittal and approval requirements for the required fish tissue monitoring plan, and to define the approved monitoring plan enforceable. 14. Added Special Condition A. (16.) Compliance Boundary. Boundary map will be attached to permit. 15. Added Special Condition A. (17.)Applicable State Law narrative to meet requirements of Senate Bill 729 (Coal Ash Management Act). 16. Added Special Condition A. (18.) Addition of Other Wastewater to Ash Basin Treatment System to require the submittal of EPA Form 2C upon addition of groundwater remediation wastewater to treatment system. 17. Added Special Condition A. (19.) Electronic Reporting of Discharge Monitoring Reports for electronic reporting of DMRs. Federal regulations require electronic submittal of all discharge monitoring reports(DMRs)and specify that,if a state does not establish a system to receive such submittals, then permittees must submit DMRs electronically to the Environmental Protection Agency(EPA). Proposed Schedule Draft Permit to Public Notice: June 27, 2018 Permit Scheduled to Issue: XXXX 2018 Fact Sheet Attachments RPA Spreadsheet Summary for Outfalls 007, 008 and 009