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HomeMy WebLinkAboutNC0024392_Permit (Issuance)_20230907DocuSign Envelope ID: 4COCCAE8-25A5-438D-8089-7DD60364F41A Permit NCO024392 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 provision of North Carolina General Statute 143-215.1, other lawful standards and regulations promulgated and adopted by the North Carolina Environmental Management Commission, and the Federal Water Pollution Control Act, as amended, Duke Energy Carolinas, LLC is hereby authorized to discharge wastewater and stormwater from a facility located at the McGuire Nuclear Station 12700 Hagers Ferry Rd Huntersville Mecklenburg County to receiving waters designated as the Catawba River (Lake Norman & Mountain Island Lake) in the Catawba River Basin in accordance with effluent limitations, monitoring requirements, and other conditions set forth in Parts I, II, III, and IV hereof. The permit shall become effective October 1, 2023. This permit and the authorization to discharge shall expire at midnight on September 30, 2028. Signed this day September 7, 2023. IV DocuSigned by: ih+s 06WAtt, CE9CD2D3C45B4D4... Richard E. Rogers, Jr., Director Division of Water Resources By Authority of the Environmental Management Commission DocuSign Envelope ID: 4COCCAE8-25A5-438D-8089-7DD60364F41A Permit NCO024392 SUPPLEMENT TO PERMIT COVER SHEET All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked. As of this permit issuance, any previously issued permit bearing this number is no longer effective. Therefore, the exclusive authority to operate and discharge from this facility arises under the permit conditions, requirements, terms, and provisions included herein. Duke Energy Carolinas, LLC is hereby authorized to: 1. Continue to operate wastewater treatment facilities necessary to comply with final effluent limitations contained in this permit and located at McGuire Nuclear Station, northwest of Charlotte in Mecklenburg County; 2. Outfall 001: Continue to discharge wastewaters from Internal Outfall 004, condenser cooling water, once through cooling water, low pressure service water, ventilation unit drains, KC heat exchanger drain, through Outfall 001 at the location specified on the attached map into Lake Norman which is classified Class WS-IV, B; CA waters in the Catawba River Basin; the use, and subsequent discharge, of Auxiliary Condensate System Water for backflushing of piping connections between the RN piping and the CA system is authorized on an as -needed basis. 3. Outfall 002: Continue to discharge from miscellaneous system components cleaning, turbine building sumps, water treatment room sumps, condensate demineralizer backwashes, closed cooling systems, the Standby Shutdown Facility sumps, laboratory drains, landfill leachate, steam generator blowdown, wet lay-up, dewatering pumps, chemical cleaning wastewater and other low volume wastewater generating activities after treatment in the conventional wastewater treatment system consisting of a 200,000 gallon concrete lined initial holdup pond lined with a sprayed in polyurethane liner, two parallel 2.5 MG settling ponds (both with HDPE liner), a concrete lined 1 MG final holdup pond lined with a sprayed in polyurethane liner, chemical addition of coagulants, oxidants, catalysts, pH control, and effluent pH adjustment by CO2 addition with discharge through Outfall 002 at the location specified on the attached map into the Catawba River (Mountain Island Lake) which is classified WS- IV; CA waters in the Catawba River Basin; 4. Internal Outfall 004: Continue to discharge from the radwaste liquid monitoring system, floor and equipment drains, laundry drains, ventilation unit drains and other low volume wastewater generating activities through Internal Outfall 004, discharging through Outfall 001 at the location specified on the attached map into Lake Norman which is classified WS-IV, B; CA waters in the Catawba River Basin; Outfall 005: Continue to discharge standby nuclear service pond overflow, administrative building drains (HVAC sump, floor drains, janitorial sinks, hot water boiler, chiller water system), closed cooling system water from auxiliary building (during maintenance), main condenser cooling dewatering, filtered water, HVAC unit drains, yard drains, emergency discharge of the turbine building sumps and reverse osmosis reject flows to the wastewater collection basin consisting of a 13.4 acre settling pond and surface skimmer with discharge through Outfall 005 at the locations specified on the attached map into the Catawba River (Mountain Island Lake) which is classified WS-IV; CA waters in the Catawba River Basin; and 6. Internal Outfall 006: Continue to discharge chemical metal cleaning wastes from Internal Outfall 006 through outfall 002 at the location specified on the attached map into the Catawba River (Mountain Island Lake) which is classified WS-IV CA waters in the Catawba River Basin and through outfall 004 at the location specified on the attached map into Lake Norman which is classified WS-IV B; CA waters in the Catawba River Basin. Page 2 of 15 DocuSign Envelope ID: 4COCCAE8-25A5-438D-8089-7DD60364F41A Permit NCO024392 PART I A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 001) [15A NCAC 02B .0400 et seq., 02B .0500 et seq.] During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge from Outfall 001. Such discharges shall be limited and monitored' by the Permittee as specified below: PARAMETER DISCHARGE LIMITATIONS MONITORING REQUIREMENTS Monthly Average Daily Maximum Measurement Frequency Sample Type Sample Locationz Intake Flow (MGD) Daily Pump Logs I Temperature' (October — June) 95 OF (35°C) Daily Recorder DCB Temperature' (July -September) 99 OF (37.2°C) Daily Recorder DCB pH4 Quarterly Grab DCB Acute Toxicity' Quarterly Composite DCB Free Available Chlorine' 0.20 mg/L 0.50 mg/L Weekly Multiple Grab' DS Time of Chlorine Addition Footnote 8 NOTES: 1. Continue submitting discharge monitoring reports electronically using NC DWR's eDMR application system. See Special Condition A. (22.). 2. I: Intake. DCB: Discharge canal bridge. DS: Discharge structure corresponding to an individual unit. 3. Temperature limits are based on Clean Water Act Section 316(a) thermal variance [see Special Condition A. (6.)]. A temperature mixing zone is defined in Special Condition A. (16.). 4. The pH shall not be less than 6.0 standard units or greater than 9.0 standard units. 5. Acute Toxicity (Ceriodaphnia 24 hour); No significant mortality at 90% with a composite sample of equal volumes collected at one -hour intervals during a 24-hour period. Toxicity samples will be collected in February, May, August, and November. See Special Condition A. (7.). 6. Monitoring for free available chlorine is required during and subsequent to chlorination. Monitoring shall begin immediately upon start-up of chlorination and shall discontinue when free available chlorine is no longer detected. Neither free available chlorine nor total residual chlorine may be discharged from any single generating unit for more than two hours per day unless the discharger demonstrates to the State that discharge for more than two hours is required for macroinvertebrate control. 7. Multiple grab samples shall consist of grab samples collected at the approximate beginning of Free Available Chlorine (FAC) discharge and once every 15 minutes thereafter until FAC is no longer detected. "Daily Maximum" FAC is the instantaneous maximum of any single grab. 8. The Permittee shall maintain a log of all chlorination events within each unit. The log shall be maintained on file at the plant and shall be available for review or submitted to the Division upon request by any of its representatives. For each chlorination event, the log shall list: (1) each system that is chlorinated; (2) the volume of the system (gpm); (3) the chlorination begin and end time; and (4) the total time of the chlorination event (minutes). DISCHARGE OF ANY PRODUCT REGISTERED UNDER THE FEDERAL INSECTICIDE, FUNGICIDE, AND RODENTICIDE ACT IS PROHIBITED UNLESS SPECIFICALLY AUTHORIZED ELSEWHERE IN THIS PERMIT. THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS. NOTE: TREATMENT OF THE NUCLEAR SERVICE WATER WITH HYDROGEN PEROXIDE TO ADDRESS FOULING OF THE REACTOR COOLANT PUMP HEAT EXCHANGER IS PERMITTED. Page 3 of 15 DocuSign Envelope ID: 4COCCAE8-25A5-438D-8089-7DD60364F41A Permit NCO024392 A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 002) [15A NCAC 02B .0400 et seq., 02B .0500 et seq.] During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge from outfall 002 (Conventional Wastewater Treatment Facility). Such discharges shall be limited and monitored' by the Permittee as specified below: PARAMETER DISCHARGE LIMITATIONS MONITORING REQUIREMENTS Monthly Average Daily Maximum Measurement Fre uenc Sample Type Sample Location2 Flow (MGD) Daily Instantaneous E Oil and Grease 15.0 m /L 20.0 m /L Quarterly Grab E Total Suspended Solids 30.0 m /L 100.0 m L Quarterly Grab E Total Residual Chlorine Monthly Grab E H3 Monthly Grab E Acute Toxicity' Quarterly Grab E NOTES: 1. Continue submitting discharge monitoring reports electronically using NC DWR's eDMR application system. See Special Condition A. (22.). 2. E: Effluent, with sampling performed prior to mixing with any other waste streams. 3. The pH shall not be less than 6.0 standard units or greater than 9.0 standard units. 4. Acute Toxicity (Ceriodaphnia); LC5o at 80% with samples collected in February, May, August, and November. See Special Condition A. (8). THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS. Page 4 of 15 DocuSign Envelope ID: 4COCCAE8-25A5-438D-8089-7DD60364F41A Permit NCO024392 A. (3.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Internal Outfall 004) [15A NCAC 02B .0400 et seq., 02B .0500 et seq.] During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge from internal outfall 004 (Low Volume Wastes/Radwaste Liquid Waste Monitoring System)'. Such discharges shall be limited and monitored by the Permittee as specified below: PARAMETER DISCHARGE LIMITATIONS4 MONITORING REQUIREMENTS Monthly Average Daily Maximum Measurement Fre uenc Sample Type I Sample I Location Flow (MGD) Weekly Instantaneous E Total Suspended Solids 30.0 mg/L 100.0 mg/L Quarterly Grab E Oil and Grease 15.0 mg/L 20.0 mg/L Quarterly Grab E NOTES: 1. In the event the turbine building sumps are discharged through Outfall 004 or directly through Outfall 001 instead of Outfall 002, the above discharge limitations shall also apply to the turbine building sump discharge. Each discharge from the turbine building sumps shall be monitored as specified above for flow, total suspended solids, oil and grease, if applicable. 2. Continue submitting discharge monitoring reports electronically using NC DWR's eDMR application system. See Special Condition A. (22.). 3. Sample Locations: E — Waste Monitoring Tanks. 4. Limits for pH for this internal outfall have been applied at external outfall 001, based on EPA guidance regarding pH limits for low volume wastes comingled with once through cooling waters. THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS. Page 5 of 15 DocuSign Envelope ID: 4COCCAE8-25A5-438D-8089-7DD60364F41A Permit NCO024392 A. (4.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 005) [15A NCAC 02B .0400 et seq., 02B .0500 et seq.] During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge from outfall 005 (Wastewater Collection Basin). Such discharges shall be limited and monitored' by the Permittee as specified below: PARAMETER DISCHARGE LIMITATIONS MONITORING REQUIREMENTS Monthly Avera a Daily Maximum Measurement requency Sample Type Sample Location2 Flow (MGD) Weekly Instantaneous E Total Suspended Solids 30.0 m /L 100.0 m /L Quarterly Grab E Oil and Grease 15.0 m /L 20.0 m L Quarterly Grab E pH Quarterly Grab E Chronic Toxicity' Quarterly Grab E NOTES: 1. Continue submitting discharge monitoring reports electronically using NC DWR's eDMR application system. See Special Condition A. (22.). 2. E: Effluent. 3. The pH shall not be less than 6.0 standard units or greater than 9.0 standard units. 4. Chronic Toxicity (Ceriodaphnia) at 2.9 % with samples collected in February, May, August, and November. See Special condition A. (9.). THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS. Page 6 of 15 DocuSign Envelope ID: 4COCCAE8-25A5-438D-8089-7DD60364F41A Permit NCO024392 A. (5.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Internal Outfall 006) [15A NCAC 02B .0400 et seq., 02B .0500 et seq.] During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge from internal outfall 006 (Chemical Metal Cleaning Wastes)'. Such discharges shall be limited and monitored2 by the Permittee as specified below: PARAMETER DISCHARGE LIMITATIONS MONITORING REQUIRE ENTS Monthly Average Daily Maximum Measurement Frequency Sample Type Sample I Location3 Flow (MGD) 1/13atch Instantaneous E Total Suspended Solids 30.0 m L 100.0 m /L 1/Batch Grab E Oil and Grease 15.0 m L 20.0 m L IBatch Grab E Total Recoverable Copper 1.0 m /L 1.0 m /L IBatch Grab E Total Recoverable Iron 1.0 m /L 1.0 m /L 'Batch Grab E pH4 IBatch Grab E NOTES: 1. THESE LIMITATIONS SHALL APPLY TO ALL CHEMICAL METAL CLEANING WASTES TREATED AT THE FACILITY. The treated wastewater from the chemical metal cleaning wastes operation may be discharged through any permitted outfall. All limitations imposed upon internal outfall 006, with the possible exception of pH, are applicable to any chemical metal cleaning waste discharges, and must be met prior to their mixing with any other wastestream. For pH, if the wastestream is sent through the conventional wastewater treatment facility (Outfall 002) prior to discharge, the limitation below must be met at the outfall from the conventional wastewater treatment facility. 2. Continue submitting discharge monitoring reports electronically using NC DWR's eDMR application system. See Special Condition A. (22.). 3. E: Effluent. 4. The pH shall not be less than 6.0 standard units or greater than 9.0 standard units. MONITORING AND REPORTING UNDER THESE EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS IS REQUIRED ONLY WHEN CHEMICAL METAL CLEANING IS PERFORMED. THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS. Page 7 of 15 DocuSign Envelope ID: 4COCCAE8-25A5-438D-8089-7DD60364F41A Permit NCO024392 A. (6.) CLEAN WATER ACT SECTION 316(a) THERMAL VARIANCE (Outfall 001) [40 CFR 125, Subpart H] Unless this permit administratively continued, the thermal variance granted under Section 316(a) terminates on expiration of this NPDES permit. Should the permittee wish a continuation of its 316(a) thermal variance beyond the term of this permit, reapplication for such continuation shall be submitted in accordance with 40 CFR Part 125, Subpart H and Section 122.21(m)(6) not later than 180 days prior to permit expiration. Reapplication shall include a basis for continuation such as: a) plant operating conditions and load factors are unchanged and are expected to remain so for the term of the reissued permit; b) there are no changes to plant discharges or other discharges in the plant site area which could interact with the thermal discharges; and c) there are no changes to the biotic community of the receiving water body which would impact the previous variance determination. The next 316(a) studies shall be performed in accordance with the Division of Water Resources approved plan. The temperature analysis and the balanced and indigenous study plan shall conform to the specifications outlined in 40 CFR 125 Subpart H, the EPA's Draft 316(a) Guidance Manual, dated 1977, and the Region 4 letter to NCDENR, dated June 3, 2010. EPA shall be provided an opportunity to review the plan prior to the commencement of the study. Copies of all the study plans, study results, and any other applicable materials should be submitted to: 1) Electronic Version Only (pdf and thumb drive) Division of Water Resources WQ Permitting Section - NPDES 1617 Mail Service Center Raleigh, NC 27699-1617 2) Electronic Version (pdf and thumb drive) and Hard Copy Division of Water Resources Water Sciences Section 1621 Mail Service Center Raleigh, NC 27699-1621 A. (7.) ACUTE TOXICITY PASS/FAIL PERMIT LIMIT (QUARTERLY) (Outfall 001) [15A NCAC 02B .0200 et seq.] The permittee shall conduct acute toxicity tests on a quarterly basis using protocols defined in the North Carolina Procedure Document entitled "Pass/Fail Methodology For Determining Acute Toxicity In A Single Effluent Concentration" (Revised December 2010 or subsequent versions). The monitoring shall be performed as a Ceriodaphnia dubia 24 hour static test. The effluent concentration at which there may be at no time significant acute mortality is 90% (defined as treatment two in the procedure document). 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. Should any single quarterly monitoring indicate a failure to meet specified limits, then monthly monitoring will begin immediately until such time that a single test is passed. Upon passing, this monthly test requirement will revert to quarterly in the months specified above. All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge Monitoring Form (MR-1) for the month in which it was performed, using the parameter code TGE3B. Additionally, DWR Form AT-2 (original) is to be sent to the following address: Attention: North Carolina Division of Water Resources Water Sciences Section/Aquatic Toxicology Branch 1621 Mail Service Center Raleigh, North Carolina 27699-1621 Or, results can be sent to the email, ATForms.ATB&ncdenr.gov Page 8 of 15 DocuSign Envelope ID: 4COCCAE8-25A5-438D-8089-7DD60364F41A Permit NCO024392 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 and accurate and include all supporting chemical/physical measurements performed in association with the toxicity tests, as well as all dose/response data. Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for disinfection of the waste stream. Should 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, then monthly monitoring will begin immediately until such time that a single test is passed. Upon passing, this monthly test requirement will revert to quarterly in the months specified above. 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 either of these monitoring requirements or tests performed by the North Carolina Division of Water Resources indicate potential impacts to the receiving stream, this permit may be re -opened and modified to include alternate monitoring requirements or limits. NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism survival and appropriate environmental controls, shall constitute an invalid test and will require immediate follow- up testing to be completed no later than the last day of the month following the month of the initial monitoring. A. (8.) ACUTE TOXICITY PERMIT LIMIT (QUARTERLY) (Outfall 002) [15A NCAC 02B .0200 et seq.] The permittee shall conduct acute toxicity tests on a quarterly basis using protocols defined in the E.P.A. Document EPA/600/4-90/027 entitled "Methods for Measuring the Acute Toxicity of Effluents to Freshwater and Marine Organisms." The monitoring shall be performed as a Ceriodaphnia dubia 48 hour static test. The effluent concentration at which there may be at no time significant acute mortality is 80 % (defined as treatment two in the procedure document). Effluent samples for self -monitoring purposes must be obtained during representative effluent discharge below all waste treatment. 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 shall be performed at the NPDES permitted final effluent discharge below all treatment processes. Should any single quarterly monitoring indicate a failure to meet specified limits, then monthly monitoring will begin immediately until such time that a single test is passed. Upon passing, this monthly test requirement will revert to quarterly in the months specified above. All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge Monitoring Form (MR-1) for the month in which it was performed, using the parameter code TAA3B. Additionally, DWQ Form AT-2 (original) is to be sent to the following address: Attention: North Carolina Division of Water Resources Water Sciences Section 1621 Mail Service Center Raleigh, North Carolina 27699-1621 Or, results can be sent to the email, ATForms.ATBAncdenr.gov Completed Aquatic Toxicity Test Forms shall be filed with the Water Sciences Section no later than 30 days after the end of the reporting period for which the report is made. Page 9 of 15 DocuSign Envelope ID: 4COCCAE8-25A5-438D-8089-7DD60364F41A Permit NCO024392 Test data shall be complete and accurate and include all supporting chemical/physical measurements performed in association with the toxicity tests, as well as all dose/response data. Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for disinfection of the waste stream. Should 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 Environmental Sciences Section at the address cited above. Should the permittee fail to monitor during a month in which toxicity monitoring is required, then monthly monitoring will begin immediately until such time that a single test is passed. Upon passing, this monthly test requirement will revert to quarterly in the months specified above. Should any test data from either these monitoring requirements or tests performed by the North Carolina Division of Water Resources indicate potential impacts to the receiving stream, this permit may be re -opened and modified to include alternate monitoring requirements or limits. If the Permittee monitors any pollutant more frequently then required by this permit, the results of such monitoring shall be included in the calculation & reporting of the data submitted on the DMR & all AT Form submitted. NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism survival and appropriate environmental controls, shall constitute an invalid test and will require immediate follow- up testing to be completed no later than the last day of the month following the month of the initial monitoring. A. (9.) CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY) (Outfall 005) [15A NCAC 02B .0200 et seq.] The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to Ceriodaphnia dubia at an effluent concentration of 2.9%. 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, North Carolina 27699-1621 Or, results can be sent to the email, ATForms.ATB&ncdenr.gov Completed Aquatic Toxicity Test Forms shall be filed with the Water Sciences Section no later than 30 days after the end of the reporting period for which the report is made. Test data shall be complete, accurate, include all supporting chemical/physical measurements and all concentration/response data, and be certified by laboratory supervisor and ORC or approved designate signature. Page 10 of 15 DocuSign Envelope ID: 4COCCAE8-25A5-438D-8089-7DD60364F41A Permit NCO024392 Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for disinfection of the waste stream. Should there be no discharge of flow from the facility during a month in which toxicity monitoring is required, the permittee will complete the information located at the top of the aquatic toxicity (AT) test form indicating the facility name, permit number, pipe number, county, and the month/year of the report with the notation of "No Flow" in the comment area of the form. The report shall be submitted to the Water Sciences Section at the address cited above. Should the permittee fail to monitor during a month in which toxicity monitoring is required, monitoring will be required during the following month. Assessment of toxicity compliance is based on the toxicity testing quarter, which is the three month time interval that begins on the first day of the month in which toxicity testing is required by this permit and continues until the final day of the third month. Should any test data from this monitoring requirement or tests performed by the North Carolina Division of Water Resources indicate potential impacts to the receiving stream, this permit may be re -opened and modified to include alternate monitoring requirements or limits. NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism survival, minimum control organism reproduction, and appropriate environmental controls, shall constitute an invalid test and will require immediate follow-up testing to be completed no later than the last day of the month following the month of the initial monitoring. A. (10.) BEST MANAGEMENT PRACTICES It has been determined from information submitted that the plans and procedures in place at McGuire Nuclear Station are equivalent to that of Best Management Practice (BMP). A. (11.) BIOCIDES [G.S. 143-215, 143-215.1] The permittee shall not use any biocides except those approved in conjunction with the permit application. The permittee shall notify the Director in writing not later than ninety (90) days prior to instituting use of any additional biocide used in cooling systems which may be toxic to aquatic life other than those previously reported to the Division of Water Resources. Such notification shall include completion of Biocide Worksheet Form 101 and a map locating the discharge point and receiving stream. Completion of Biocide Worksheet Form 101 is not necessary for those outfalls containing toxicity testing. Division approval is not necessary for the introduction of a new biocide into an outfall currently being tested for toxicity. A. (12.) CHEMICAL METAL CLEANING WASTES The term "chemical metal cleaning waste" means any wastewater resulting from the cleaning of any metal process equipment with chemical compounds including, but not limited to, boiler tube cleaning. A. (13.) COMBINED WASTE STREAMS In the event that waste streams from various sources are combined for treatment or discharge, the quantity of each pollutant or pollutant property attributable to each controlled waste source shall not exceed the specified limitation for that waste source. A. (14.) FEDERAL INSECTICIDE, FUNGICIDE, AND RODENTICIDE ACT Discharge of any product registered under the Federal Insecticide, Fungicide, and Rodenticide Act to any waste stream which may ultimately be released to lakes, rivers, streams, or other wastes of the United States is prohibited unless specifically authorized elsewhere in this permit. This requirement is not applicable to products used for lawn and agricultural purposes. Discharge of chlorine from the use of chlorine gas, sodium hypochlorite, or other similar chlorination compounds for disinfection in plant potable and service water systems and in sewage treatment is authorized. Page 11 of 15 DocuSign Envelope ID: 4COCCAE8-25A5-438D-8089-7DD60364F41A Permit NCO024392 A. (15.) INTAKE SCREEN BACKWASH Continued intake screen backwash discharge is permitted without limitations or monitoring requirements. However, the discharge of oil and grease is prohibited from this discharge. A. (16.) TEMPERATURE MIXING ZONE (Outfa11001) The mixing zone is defined as containing an area of no more than 3,500 acres and lying upstream of the dam and south of a line originating on the west bank of NC coordinates E-1,416,900 and N-633,600 and extending south 70- 00 east intersecting the point of land on the eastern shore. Water quality stream standards for temperature shall be met outside the mixing zone. A. (17.) OTHER DISCHARGES The permittee is hereby authorized to discharge as follows: a. The Cowans Ford Dam underdrain discharge to the Catawba River which includes uncontaminated bearing lubrication and gland seal water, and possibly silt from cyclone separators; and b. Fire protection water (approved biocides only) to Lake Norman (Catawba River). A. (18.) POLYCHLORINATED BIPHENYL COMPOUNDS There shall be no discharge of polychlorinated biphenyl compounds such as those commonly used for transformer fluid. A. (19.) RADIOACTIVE MATERIAL Releases of radioactive material shall be monitored and conducted in accordance with all conditions and limitations required by the Nuclear Regulatory Commission (NRC) and as specified in the Final Safety Analysis Report, Technical Specifications, and Environmental Statement for the McGuire Nuclear Station. A. (20.) TOXICITY REOPENER This permit shall be modified, or revoked and reissued to incorporate toxicity limitations and monitoring requirements in the event toxicity testing or other studies conducted on the effluent or receiving stream indicate that detrimental effects may be expected in the receiving stream as a result of this discharge. A. (21.) CLEAN WATER ACT SECTION 316 (b) [40 CFR 125.95] Based on evaluation of the 316(b) study reports the Department concludes that the existing configuration at McGuire represents BTA for meeting the impingement and entrainment requirements of the Rule. The permittee shall continue to comply with the Cooling Water Intake Structure Rule per 40 CFR 125.95. Nothing in this permit authorizes take for the purposes of a facility's compliance with the Endangered Species Act. A. (22.) ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS (STATE ENFORCABLE ONLY) [G.S. 143-215. 1 (b)] Federal regulations require electronic submittal of all discharge monitoring reports (DMRs) and program reports and specify that, if a state does not establish a system to receive such submittals, then permittees must submit monitoring data and reports electronically to the Environmental Protection Agency (EPA). The final NPDES Electronic Reporting Rule was adopted and became effective on December 21, 2015. NOTE: This special condition supplements or supersedes the following sections within Part II of this permit (Standard Conditions for NPDES Permits): Page 12 of 15 DocuSign Envelope ID: 4COCCAE8-25A5-438D-8089-7DD60364F41A Permit NC0024392 • Section B. (11.) Signatory Requirements • Section D. (2.) • Section D. (6.) • Section E. (5.) Reporting Records Retention Monitoring Reports 1. Reporting Requirements [Supersedes Section D. (2.) and Section E. (5.) (a)1 Effective December 21, 2016, 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 DEQ / Division of Water Resources / Water Quality Permitting Section ATTENTION: Central Files 1617 Mail Service Center Raleigh, North Carolina 27699-1617 If a permittee is unable to use the eDMR system due to a demonstrated hardship or due to the facility being physically located in an area where less than 10 percent of the households have broadband access, then a temporary waiver from the NPDES electronic reporting requirements may be granted and discharge monitoring data may be submitted on paper DMR forms (MR 1, 1. 1, 2, 3) or alternative forms approved by the Director. Duplicate signed copies shall be submitted to the mailing address above. See "How to Request a Waiver from Electronic Reporting" section below. Regardless of the submission method, the first DMR is due on the last day of the month following the issuance of the permit or in the case of a new facility, on the last day of the month following the commencement of discharge. Starting on December 21, 2025, 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. Page 13 of 15 DocuSign Envelope ID: 4COCCAE8-25A5-438D-8089-7DD60364F41A Permit NC0024392 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: htlp://portal.ncdenr.or web/wq/admin/bo ipu/edmr 4. Signatory Requirements [Supplements Section B. (11.) (b) and Supersedes Section B. (11.) (d)1 All eDMRs submitted to the permit issuing authority shall be signed by a person described in Part II, Section B. (I1.)(a) or by a duly authorized representative of that person as described in Part II, Section B. (I1.)(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: h!Ltp://portal.ncdenr.org/web/wq/admin/bog/ipu/ednir Certification. Any person submitting an electronic DMR using the state's eDMR system shall make the following certification [40 CFR 122.221. NO OTHER STATEMENTS OF CERTIFICATION WILL BE ACCEPTED: "I certify, under penalty of law, that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fines and imprisonment for knowing violations. " 5. Records Retention [Supplements Section D. (6.)] 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 14 of 15 DocuSign Envelope ID: 4COCCAE8-25A5-438D-8089-7DD60364F41A Permit NCO024392 LAKE NORMAN r ,\ � } . Creek y�� �+��,• ii ��5 b� ?0 •0 J !J: / � � �_` • lib:l' � s Imo- F �� l �%� /� �.,�, Outfall 001 Internal Outfall 004 y s Internal Outfall 006 t r Outfall 00230 ' r 7 Outfall 005 r " 1 �: ;U '[.fie �! �• '� � -� ; % Duke Energy Carolinas — McGuire Nuclear Station Facility Location (not to scale) Outfall 001/004: Outfall 005: Receiving Stream: Lake Norman Receiving Stream: Catawba River Lat: 35° 26' 03" Long: 80' 56' 50" Lat: 35' 25' 57" Long: 80' 57' 20" A X Outfall 002/006: I v Receiving Stream: Catawba River Lat: 35° 25' 57" Long: 80' 57' 20" NCO024392 — Mecklenburg County Page 15 of 15