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NCS000580_Renewal Application_20201230(� DUKE ENERGY,. File: Mayo12520-R Ms. Suzanne McCoy NC DEMLR Stormwater Program 1612 Mail Service Center Raleigh, NC 27699-1612 Subject: Duke Energy Progress, LLC. Mayo Electric Generating Plant NPDES Industrial Stormwater Permit NCS000580 Renewal and Modification Request Dear Ms. McCoy: December 17, 2020 Mayo Electric Generating Plant Duke Energy Progress 10660 Boston Road Roxboro, NC 27574 DEC 3 0 2020 DENR-LAND QUALITY STORMWATER PERMITTING Duke Energy Progress, LLC is submitting herewith supplemental information in support of renewing and modifying NPDES permit No. NCS000580 as well as a major modification. The subject NPDES permit expires December 31, 2021. The requested modification will provide coverage for the three monofill stormwater outfalls 001, 002, and 003. All three of these stormwater outfalls discharge to Bowes Branch, a class C surface water in the Roanoke River Basin and are currently covered under the NCG 120101 permit. The NCG120101 will expire May 31, 2021. Duke Energy requests the renewal and reissuance of NPDES Permit No. NCS000580 and further requests that the NCG120101 permit be rescinded upon reissuance of the subject NPDES permit. Attached is the renewal application and duplicate copies of all supplementary information. Should you have any questions please contact Ms. Lori Tollie at Lori.TollieAduke-enero.com or at (336)-854-4916. Sincerely, Tom Co o General Manger — Mayo Steam Station Attachments: Renewal Application Supplemental Information Site map from the Stormwater Pollution Prevention Plan Summary of Analytical Monitoring Results Summary of Visual Monitoring Results Significant Site Changes Certification of Development and Implementation of SPPP Fish Tissue Monitoring Results General Permit Renewal Guidance Letter with NCG120101 Results May Steam Electric Station Stormwater Permit NCS000580 Individual Permit Application Supplemental Information Permit Coverage Renewal Application Form NCDENR National Pollutant Discharge Elimination System NPDES Permit Number Stormwater Individual Permit NCS000580 Please provide your permit number in box in the upper right hand corner, complete the information in the space provided below and return the completed renewal form along with the required supplemental information to the address indicated. Owner Information * Address to which permit correspondence will be mailed Owner / Organization Name: Duke Energy Progress LLC. Owner Contact: Paul Draovitch - Senior VP EHS, Operations Support & CCP Mailing Address: PO Box 1006 Charlotte, NC 28201 Phone Number: 980-373-0408 Fax Number: E-mail address: Paul. Draovitch@duke-energy.com Facility Information Facility Name: Mayo Steam Electric Power Plant Facility Physical Address: 10660 Boston Road Roxboro, NC 27573 Facility Contact: Tom Copolo Mailing Address: 10660 Boston Road Roxboro, NC 27573 Phone Number: 336-597-7307 Fax Number: E-mail address: Tom.Copolo@duke-energy.com Permit Information Permit Contact: Lori Tollie Mailing Address: 2500 Fairfax Road Greensboro, NC 27407 Phone Number: 336-854-4916 Fax Number: E-mail address: Lori.Tollie@duke-energy.com Discharge Information Receiving Stream: Mayo Reservoir Stream Class: WS-V Basin: Roanoke Sub -Basin: 03-02-05 Number of Outfalls: 3 outfalls - Outfall 006a, Outfall 010, and Outfall 002 Facility/Activity Changes Please describe below any changes to your facility or activities since issuance of your permit. Attached a separate sheet if necessary. No changes have occurred in the drainage areas of the three existing outfalls. Duke Energy would like to add the three stormwater outfalls from the Mayo Monofill (Outfalls 001, 002, & 003) and not renew the NCG120101 permit that the monofill outfalls are currently covered by. Duke Energy would like to have monofill stormwater outfall 002 changed to outfal 002a to differentiate it from the existing outfall 002 in the NPDES permit. CERTIFICATION I certify that I am familiar with the information contained in the application and that to the best of my knowledge and belief such information,is true, gQnpAete and accurate. Signaturey ur Date lall? /At e M l 4 I?tj t, tj & 0 r M Rf V S-TA-(, o A S Print or type name of person signing above Title Please return this completed application form SW Individual Permit Coverage Renewal Stormwater Permitting Program and requested supplemental information to: 1612 Mail Service Center Raleigh, North Carolina 27699-1612 SUPPLEMENTAL INFORMATION REQUIRED FOR RENEWAL OF INDIVIDUAL NPDES STORMWATER PERMIT Two copies of each of the following shall accompany this submittal in order for the application to be considered complete: (Do not submit the site Stormwater Pollution Prevention Plan) Initials LWT 1. A current Site Map from the Stormwater Pollution Prevention Plan. The location of industrial activities (including storage of materials, disposal areas, process areas and loading and unloading areas), drainage structures, drainage areas for each outfall, building locations and impervious surfaces should be clearly noted. LWT 2. A summary of Analytical Monitoring results during the term of the existing permit (if your permit required analytical sampling). Do not submit individual lab reports. The summary can consist of a table including such items as outfall number, parameters sampled, lab results, date sampled, and storm event data. LWT 3. A summary of the Visual Monitoring results. Do not submit individual monitoring reports. The summary can consist of a table including such items as outfall number, parameters surveyed, observations, and date monitoring conducted. LWT 4. A summary of the Best Management Practices utilized at the permitted facility. Summary should consist of a short narrative description of each BMP's in place at the facility. If the implementation of any BMP's is planned, please include information on these BMP's. LWT 5. A short narrative describing any significant changes in industrial activities at the permitted facility. Significant changes could include the addition or deletion of work processes, changes in material handling practices, changes in material storage practices, and/or changes in the raw materials used by the facility. LWT 6. Certification of the development and implementation of a Stormwater Pollution Prevention Plan for the permitted facility (Sign and return attached form). If the final year analytical monitoring of the existing permit term has not been completed prior to filing the renewal submittal, then the last years monitoring results should be submitted within 30 days of receipt of the laboratory reports. (i.e. do not withhold renewal submittal waiting on lab results) Attachment 1 Site Maps N A= 0 75 150 Feet pervious = 2.01 Acres Basemap Cq,gn l 02013 Naeonal GeogWhc S.-ty FnCed NC OneMep NC C— V Gmgr¢Nic Inbr- ' aid Melyso. NC 911 Bone NC OneMep NC C—, Ipr Geo wZ Inf.=-and Mean NC DOT -GIS UN NC Fbodph n Mapping Progm, Facility Location (Map not to scale) s Legend Storm Water Outfall Location Drainage Area Impervious Surfaces Pervious Surfaces r^ 532 532 4 y .._-> . .'. . S6B o 528 534 hh0 SS6 �o 112 o. Pe ry io = 8 576 524 ;; 520 "F 556s -. , 596 .7. Ss sos� Impervious -061 Aires 6100 } -- 552 ..... fy� ;! w.. rn h ... ,... 522 yea. (�5 S W -010 h .. ®Latitude 36`3117"N . 5� Longitudes. 79' 53 39"W �< 556 40 ...hie b h 4�2 66 $ ti hh 4�ti 'S'r1 :. ... 586 5 590 598 }, � k 526 630 0 4so 150 30l) {.�* fta map..cpy gn 02013N �o graph' Soc y Wee -. -` `NC OneMy, NC G R br Geogftpti 1 brmetun tlA elyss NC 911 Bmtl Feet - [ NC OneM.y. NC C kr br Gaogr�hic lnbrmeton mtl Melysq NC DOT GIS Uni, ,'`SGpSss„'^...... iiNC FbodGlan MaVV {f 561ai�.i./i 9Pro92m. ,h Facility Location (Map not to scale) i� Legend Storm Water Outfall Location Drainage Area Impervious Surfaces Pervious Surfaces AREA#3 � �i%/� ��\ � j k� �f ice•,.. OUTFACE#3 ��/ 4 I f SKIMMER BASIN I -_DRAINAGE { , AREA 01 oil C R C I g,I► �Crt" PERK MIENT L E l \ „'�':'� .. SEDNA ANT '� �'f)2�_ _ ✓ �• ��� � � �� '�`, BASIN i F � � /t w / i fs \ E OUTFALL 07 t ` ►dZ R DRAINAGE AREA #2 PERMANENT \1 SASIN#NT -s B - j \ i 2 , OUTFALL a , ✓.� / , �°° e we mo o G:NERAL sroRNWArER RERNIr - nrE DIAGRAN c7F crF cDx 071zDla PRZGRESS ENERGY CAROLINAS, INC. 5 nn^^ ,,yy POWER OPERATIONS GROUP R WlIKr .w � A . Associates " � MONOFILL GE. ITE D1AGRAN IALSTORMWA� RAT 3 GGLDER ASSOP 5 NC. ING. GREENS 0. au ANl4p 7'NOI 1-1YAYO CCP MONOflLL DRAWING REFERENCES DRAWINGDRAWING REVISIONS °° 1 ¢ 7 11 1 2 3 -}- 5 6 -+- 1 7 8 9 ID 11 12 Attachment 2 Analytical Monitoring Results Summary of Analytical Monitoring Data 2017-2020 Mayo Steam Electric Plant NPDES Permit No. NCS000580 Stormwater Outfall Sw 010 Date Sampled 3/31/2017 11/9/2017 2/4/2018 11/5/2018 3/21/2019 6/18/2019 7/23/2019 10/16/2019 11/12/2019 1/14/2020 9/17/2020 Rainfall 0.94 0.95 0.75 1.75 1.21 1.89 2.03 0.8 0.54 0.49 2.61 pH 6.02 6.02 6.15 6.2 6.09 6.18 6.33 6.46 6.39 6.03 6.52 copper 0.0023 0.0056 0.0056 0.0035 0.00492 0.00511 0.0153 0.00514 0.0046 0.0037 0.00601 selenium 0.00039 0.00082 0.00028 <.00031 <.001 <.001 <.001 <.001 <.001 <.001 <.001 mercury 0.00000803 8.13 0.00000831 0.0000134 0.0000291 0.000021 0.0000416 0.00000464 550 0.0000142 0.00000999 zinc 0.0089 0.0081 0.0177 0.0082 0.019 0.016 0.028 0.005 0.008 0.009 <.005 tss 10.6 4.1 50.5 17.9 150 89 324 4 15 4.1 6.9 oil & grease <5.0 <1.1 <1.1 <1.1 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 Sulfate 6.4 COD 26 Ca 6600 Additonal Prioritv Pollutant Metals Stormwater Outfall Sw 010 Date Sampled 3/31/2017 11/9/2017 2/4/2018 11/5/2018 3/21/2019 6/18/2019 7/23/2019 10/16/2019 11/12/2019 1/14/2020 9/17/2020 Ag <.00007 <.00007 <.00017 <.00007 <.0002 <.0002 <.0002 <.0002 <.0002 0.0002 <.0002 As 0.00044 0.00025 0.00054 0.00042 <.001 <.001 0.00129 <.001 <.001 <.001 <.001 Be 0.000035 0.000014 0.000083 0.000082 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Cd <.0005 <.0005 0.000045 <.00005 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Cr 0.0017 1 0.00084 0.0051 0.0028 0.00761 0.00534 0.0221 <.001 0.00236 0.00226 0.0017 Ni 0.0017 0.00076 0.0024 0.0019 0.0031 0.00259 0.0113 0.00164 0.00196 0.00154 0.00204 Pb 0.00053 0.00034 0.002 0.0013 0.00316 0.00207 0.00838 <.001 <.001 <.001 <.001 Sb <.0001 0.00011 0.00015 <.0001 <.0001 <.001 <.005 <.001 <.001 <.001 <.001 TI 1 <.000015 <.000015 1 <.000028 1 <.000015 <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 B 1 1 0.0222 1 0.0058 1 0.0117 <.05 1 <.05 1 <.05 <.05 <.05 <.05 <.05 Stormwater Outfall SW 006A Date Sampled 5/22/2017 11/9/2017 2/4/2018 11/5/2018 3/21/2019 7/23/2019 1/14/2020 9/17/2020 Rainfall 0.79 0.95 0.75 1.75 1.21 2.03 0.49 2.61 pH 6.21 6.02 6.15 6.43 6.15 6.47 6.41 6.39 copper 0.01 0.0056 0.0081 0.0041 0.00446 0.00459 0.00706 0.00272 selenium 0.056 0.00082 0.00026 <.00031 <.001 <.001 <.001 <.001 mercury 0.00000328 5.45 0.00000471 0.0000099 0.0000181 0.00000855 0.0000136 0.00000276 zinc 0.126 0.0049 0.0237 0.0134 0.02 0.007 0.011 0.007 tss 100 4.3 82.5 10 62 5 <2.5 <2.5 oil & grease 3.5 <1.1 <1.1 <1.1 <.5.0 <5.0 <5.0 <5.0 Sulfate COD Ca Stormwater Outfall SWO06A Date Sampled 5/22/2017 11/9/2017 2/4/2018 11/5/2018 3/21/2019 7/23/2019 1/14/2020 9/17/2020 Ag <.00007 <.0007 <.00017 <.00007 <.0002 <.0002 0.0002 <.0002 As 0.00027 0.00023 0.00038 0.00029 <.001 <.001 <.001 <.001 Be <.000010 0.000011 0.000085 0.000048 <.001 <.001 <.001 <.001 Cd <.00005 <.00005 0.000045 <.00005 <.001 <.001 <.001 <.001 Cr 0.00038 0.00045 0.0058 0.0016 0.00313 <.001 <.001 <.001 Ni 0.00063 0.00093 0.0029 0.0015 0.00194 0.00138 0.00211 <.001 Pb 0.00015 0.00021 0.0024 0,00078 0.00142 <.001 <.001 <.001 Sb 0.00014 <.0001 <.00012 <.0001 <.001 <.001 <.001 <.001 TI <.000015 <.000015 <.000028 <.000015 <.0002 <.0002 <.0002 <.0002 B <.05 <.05 <.05 <.05 Stormwater Outfall SW 002 Date Sampled 6/18/2019 7/23/2019 10/16/2019 11/12/2019 1/14/2020 4/20/2020 9/17/2020 10/29/2020 Rainfall 1.89 2.03 0.8 0.54 0.49 0.52 2.61 0.84 pH 7.05 6.53 7.26 7.38 6.97 6.8 6.51 6.74 copper 0.0568 0.0144 0.0057 0.00342 0.00356 0.00357 0.00242 0.00305 selenium 0.00117 <.001 <.001 <.001 <.001 <.001 <.001 <.001 mercury 0.0000699 0.0000143 0.00000149 0.00000322 0.0000035 0.0000176 0.00000844 0.00000375 zinc 0.137 0.018 0.012 0.013 0.008 0.006 0.026 <.005 tss 1300 237 <2.7 9.13 15 24 4.5 <2.5 oil & grease <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 Sulfate COD Ca Stormwater Outfall SW002 Date Sampled 6/18/2019 7/23/2019 10/16/2019 11/12/2019 1/14/2020 4/20/2020 9/17/2020 10/29/2020 Ag <.0002 <.0002 <.0002 <.0002 0.0002 <0.0002 <.0002 <.0002 As <.005 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Be 0.00101 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Cd 0.001 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Cr 0.0602 0.0155 0.00261 0.00168 0,00245 0.00208 0.00105 <.001 Ni 0.0301 0.00718 0.00136 <.001 0.0027 0.00362 0.00174 0.00146 Pb 0.0191 0.0038 <.001 <.001 <.001 <.001 <.001 <.00146 Sb <.005 <.001 <.001 <.001 <.001 <.001 <.001 <.001 TI <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 B <.05 <.05 <.05 <.05 <.05 <.05 <.05 <.05 Attachment 3 Summary of Visual Monitoring Data Summary of Visual Qualitative Monitoring Data 2017-2020 Mayo Steam Electric Plant NPDES Permit No. NCS000580 Stormwater Outfall SW 010 Date Sampled 5/22/2017 11/9/2017 1/29/2018 4/24/2018 9/17/2018 11/5/2018 3/21/2019 6/18/2019 7/23/2019 10/16/2019 Color light tan light tan light tan light tan tan light tan tan tan tan light brown Odor none none none none none none none none none none Clarity 2 2 2 2 3 3 3 4 3 2 Suspended Solids 1 1 1 1 2 1 2 2 2 1 Floating Solids 1 1 1 1 3 1 3 3 3 1 Visable Foam none none none none none none none none none none Visable Oil Sheen none none none none none none none none none none Indication of Erosion/Depostion none none none none none none none yes yes none Rain Event Accumulation 1 0.53 1 0.95 1 0.85 1 1.02 1 4.79 1.57 1 1.21 1 1.89 1 2.03 1 0.8 Outfall Status I active I active I active I active I active I active I active I active I active I active Stormwater Outfall SW010 Date Sampled 11/12/2019 1/14/2020 4/20/2020 Color pale tan light tan light tan Odor none none none Clarity 2 2 2 Suspended Solids 1 1 1 Floating Solids 1 1 1 Visable Foam none none none Visable Oil Sheen none none none Indication of Erosion/Depostion none none none Rain Event Accumulation 1 0.54 1 0.49 1 0.52 Outfall Status I active I active I active Stormwater Outfall SW 006A Date Sampled 2/15/2017 5/22/2017 11/9/2017 1/29/2018 4/24/2018 9/17/2018 11/5/2018 3/21/2019 1/14/2020 4/20/2020 Color light tan light tan light tan light tan light tan tan light tan tan light tan clear Odor none none none none none none none none none none Clarity 1 1 2 1 2 3 3 2 2 1 Suspended Solids 1 1 1 1 1 2 1 2 1 1 Floating Solids 1 1 1 1 1 3 1 2 1 1 Visable Foam none none none none none none none none none none Visable Oil Sheen none none none none none none none none none none Indication of Erosion/Depostion none none none none none none none none none none Rain Event Accumulation 0.19 0.53 0.95 0.85 1.02 4.79 1.57 1.21 0.49 0.52 Outfall Status active active active active active active active I active active active Stormwater Outfall SW 002 Date Sampled 10/16/2019 11/12/2019 1/14/2020 4/20/2020 Color clear pale tan pale tan light tan Odor none none none none Clarity 1 1 2 2 Suspended Solids 1 1 1 1 Floating Solids 1 1 1 1 Visable Foam none none none none Visable Oil Sheen none none none none Indication of Erosion/Depostion none none none none Rain Event Accumulation 0.8 0.54 0.49 0.52 Outfall Status active active active active Notes: Outfall 002 added to permit effective March 21, 2019 Attachment 4 Summary of Best Management Practices 3.2.3.1 Nonstructural Best Management Practices (BMP's) are methods, procedures, processes, prohibitions of practices and other management controls which serve to eliminate, mitigate, or reduce pollutant loadings in storm water discharges. Examples of BMP's for the Mayo Electric Generating Plant include: • Source Reduction • Good Housekeeping • Preventive Maintenance • Visual Inspections • Spill Prevention and Response • Erosion and Sediment Control • Storm Water Runoff Management • Employee Training • Recordkeeping and Reporting • Recycling • Treatment 3.2.3.2 Source Reduction Source reduction measures reduced storm water pollution by reducing the quantity of materials, which may contact storm water. The source reductions measures to be implemented may require modifications in present work habits and practices. Example components of source reduction are: • Good Housekeeping • Preventive Maintenance • Visual Inspections • Spill Prevention and Response • Erosion and Sediment Control Many of the components of source reduction are addressed as main components of the BMP, therefore, source reduction should be considered under each of the other BMP components. ERM NC, INC. 3-4 398458 3.2.3.3 Good Housekeeping Good housekeeping practices are designed to maintain a clean and orderly work environment. Good housekeeping practices should be incorporated in the day-to-day conduct of operations and maintenance. A clean and orderly work area reduces the possibility of accidental spills caused by the mishandling of chemicals and equipment. Well -maintained material and chemical storage areas reduce the possibility of storm water mixing with pollutants. The following practices shall be performed on a regular basis: • Maintain clean and dry floors, ground surfaces, work, and process areas through the use of brooms, shovels, vacuum cleaners, mops and cleaning equipment. • Regular pickup and disposal of waste materials. • Proper operation of equipment. • Routine visual inspections by qualified personnel for leaks or spills, and for conditions which may lead to a leak or spill (such as the hazardous waste inspections being performed at various areas throughout the Mayo Plant). • Training of employees in spill prevention and cleanup procedures. • Bags storing dry chemicals shall be raised off the floor, preferably by pallet, to prevent any unwanted interaction of the chemical with water. • Walkways shall be maintained free of obstructions to facilitate inspection for leaks or spills. The Fossil Chemistry Technician assigned the ORC duties routinely inspects work and storage areas for best housekeeping practices. Corrections are handled by work orders tracked through Maximo, the Company work order management system, on an as needed basis. 3.2.3.4 Preventive Maintenance Mayo Plant has various inspections and site assessment practices in place to assist with detection of potential problems. Preventive maintenance schedules vary based on the potential risk by the source. In general, the Mayo Plant is well manned in order to ensure the facility is a reliable and efficient source of electricity. Preventive maintenance will be performed to ensure that storm water management facilities and controls operate correctly and effectively and to reduce their breakdowns and failure. Specific activities include: • Periodic inspection, cleanout and maintenance of catch basins, containment areas, ditches, and conveyance equipment. • Periodic scheduled inspection and testing of equipment and systems, including pumps, valves, pipes, storage tanks, and controls. • Proper scheduled maintenance of equipment and facilities. Additional preventive maintenance information will be provided as a separate section of the SPPP. ERM NC, INC. ' 5 3%4-% 3.2.3.5 Visual Inspections Visual inspections will be performed in conjunction with other BMP's, such as housekeeping and preventive maintenance, and also as a separate activity (see section 3.5 "Facility Inspection"). 3.2.3.6 Spill Prevention and Response Spill prevention will be achieved by good housekeeping, visual inspection, and preventive maintenance, and through training of personnel in material handling and storage procedures, and the use of equipment. Training in proper spill identification and cleanup procedures, including the use of equipment and the notification and documentation procedures, will be the main components of spill response. Specific spill preventative measures will include: • Piping protection, such as routing, coatings and wrappings, and cathodic protection where appropriate. • Adherence to current unloading procedures and practices, including monitoring and verification of all connections and seals. • Proper valve and control settings, and adequate labels, markings, and communications, to ensure that accidental closures or openings do not occur. • Adequate securities to prevent non -authorized access to facilities. • Appropriate documentation of actions taken. Spill response will be in accordance with existing Plant Procedures, including the Spill Prevention, Control and Countermeasure (SPCC) Plan and the Hazardous Substance Notification Procedure. Training is essential to a well -executed spill response. Personnel will be trained to identify potential storm water pollution occurrences as may occur during a spill event, and respond in the appropriate manner. 3.2.3.7 Erosion and Sediment Control Areas under construction, or where accelerated erosion or sedimentation is occurring, will be monitored and corrective measures will be implemented as necessary. A Sediment Erosion Control Plan may be needed. The Environmental Site Coordinator will decide. Vegetation or equivalent stabilization of the ground will be performed to reduce/eliminate accelerated erosion. 3.2.3.8 Storm Water Runoff Management Uncontaminated storm water will be diverted away from potential sources of contamination, and discharged to a stabilized conveyance structure. Contaminated waters will be directed to the appropriate treatment facilities prior to discharge. Diversion efforts should be made to reduce the quantity of contaminated storm water ERM NC, INC. 3-6 399458 that must be collected and treated depending on conditions. Vehicle washing should be performed in areas away from storm water drains. 3.2.3.9 Employee Training General training of employees will emphasize good housekeeping, and preventive methods, procedures, and practices. Responsibilities will be clearly communicated to personnel, including notification procedures for preventive and corrective measures. Maintenance and inspection personnel will have the authority to follow-up on areas requiring improvement. Plant personnel will trained to in safety and cleanup operations, and recognize spill which may contribute to storm water pollution. 3.2.3.10 Recordkeeping and Reports Training documentation will utilize the current training documentation tool. Maintenance activities will be documented in the current Maximo work management tool. Reports will be sent to the plant file 12520R located in the Environmental Coordinator's Office. 3.2.3.11 Recycling No recycling of contaminated storm water occurs at the Mayo Plant. Recycling of some solid and universal wastes occurs at the Mayo Plant. 3.2.3.12 Treatment Treatment measures will be the last step prior to the discharge of contaminated storm water. Treatment is employed at the plant for those areas where, due to site constraints, other BMP's have been found to be infeasible or too costly to implement. Periodic vacuuming of storm drain catch basins will be conducted in high risk areas as needed. ERM NC, INC. 3-7 39R58 Attachment 5 Narrative of Significant Site Changes The most significant industrial changes at the site since permit issuance on January 17, 2017 include the following: Completion of all process water redirect work including grading to remove all process flows from the ash basin to a newly constructed lined retention basin. This project included the rerouting and demolition of former SW outfalls 004 and 005 completed in May of 2019. These two outfalls were included in the NPDES Industrial Stormwater permit issued January 17, 2017 but were later placed in the August 1, 2018 NPDES Wastewater permit due to the constituents in the discharge. Attachment 6 Certification of Development and Implementation of Stormwater Pollution Prevention Plan STORMWATER POLLUTION PREVENTION PLAN DEVELOPMENT AND IMPLEMENTATION CERTIFICATION North Carolina Division of Energy, Mineral, and Land Resources - Storm water Permitting Facility Name: Permit Number: Location Address Mayo Steam Electric Plant NCS000580 10660 Boston Road Roxboro, NC 27573 County: Person "I certify, under penalty of law, that the Stormwater Pollution Prevention Plan (SPPP) document and all attachments were developed and implemented under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information required by the SPPP. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information gathered is, to the best of my knowledge and belief, true, accurate and complete." And "I certify that the SPPP has been developed, signed and retained at the named facility location, and the SPPP has been fully implemented at this facility location in accordance with the terms and conditions of the stormwater discharge permit." And "I am aware that there are significant penalties for falsifying information, including the possibility of fines and imprisonment for knowing violations." Sign (according to permit signatory requirements) and return this Certification. DO NOT SEND STORMWATER POLLUTION PREVENTION PLAN WITH THIS CERTIFICATION. Signature -- —i- M Po t-e Print or type name of person signing above Date _ l al01ae 6-A \11 - QEv S-r&-r"aaS Title SPPP Certification 10/13 Attachment 7 Fish Tissue Monitoring Results Reference for Tissue Monitoring Species Composition Changes Prior to 2019, the Mayo Reservoir Trace Element fish sampling program focused on plant operations in respect to sustainable fish populations. With the implementation of flue gas desulfurization, zero liquid discharge system and ash basin modifications, water column and fish tissue concentration for various metals have declined since 2014. Prior to 2019, catfish species were included as part of the monitoring program to evaluate metals concentrations across multiple trophic levels. Catfish were removed from the Mayo monitoring program in starting in 2019 due to continued low metals (As, Hg, Se) concentrations in Mayo surface waters and fish tissues. Species collected from 2019 on include Largemouth Bass (Micropterus solmoides), and sunfish (Lepomis spp.) based on annual Fish Tissue Monitoring Plans approved by the Water Sciences Section of the North Carolina Division of Water Resources. Sample Date Location Fish Species Length Weight As (µg/g) Se (µg/g) Hg (µg/g) Dry -to fresh weight ratio 4/26/2017 G_1 Largemouth Bass 295 342 0.2 4.3 1.04 0.21 4/26/2017 G 3 Largemouth Bass 320 500 0.2 5 1.05 0.21 4/26/2017 G 3 Largemouth Bass 331 498 0.2 4.7 1.02 0.20 4/26/2017 G 3 Largemouth Bass 294 340 0.3 4.2 0.73 0.22 4/26/2017 G_3 Largemouth Bass 323 460 0.2 4.4 0.89 0.21 4/26/2017 G 3 Largemouth Bass 320 438 0.2 5.1 0.89 0.20 4/27/2017 E 1 Bluegill 167 96 0.3 7.1 0.68 0.19 4/27/2017 E 1 Largemouth Bass 340 546 0.2 8.8 0.66 0.21 4/27/2017 E 1 Largemouth Bass 300 398 0.2 6.6 0.86 0.21 4/27/2017 E 1 Largemouth Bass 377 755 0.2 7.4 1.01 0.21 4/27/2017 E 1 Largemouth Bass 318 410 0.2 5.8 0.5 0.21 4/27/2017 E_1 Largemouth Bass 367 642 0.2 7 1.02 0.20 4/27/2017 E 1 Largemouth Bass 304 398 0.2 7.4 0.82 0.20 4/27/2017 E 3 Bluegill 166 81 0.2 6.1 0.47 0.20 4/27/2017 B 3 Largemouth Bass 320 420 0.2 7.9 0.67 0.21 4/27/2017 B 3 Largemouth Bass 383 684 0.4 10.3 1.23 0.21 4/27/2017 B_3 Largemouth Bass 405 842 0.2 8.5 1.14 0.21 4/27/2017 B 3 Largemouth Bass 369 684 0.2 10.4 0.91 0.21 4/27/2017 B_3 Largemouth Bass 400 954 0.2 10.2 1.09 0.21 4/27/2017 B_1 Largemouth Bass 411 848 0.2 14.4 1.25 0.19 5/25/2017 G_3 Bluegill 221 212 0.2 5 1.36 0.18 5/25/2017 B 1 Flat Bullhead 271 229 0.2 7.1 0.46 0.18 5/25/2017 B_1 Flat Bullhead 232 170 0.2 6.9 0.74 0.18 5/25/2017 B 1 Flat Bullhead 270 254 0.2 7.1 0.79 0.19 5/25/2017 B_1 Flat Bullhead 245 200 0.2 7.3 0.31 0.19 5/25/2017 B_1 Flat Bullhead 300 320 0.2 7.4 0.49 0.18 5/25/2017 B_1 Flat Bullhead 265 202 0.2 9.2 0.37 0.18 5/25/2017 G 1 Flat Bullhead 304 353 0.2 2 0.89 0.19 5/25/2017 G 1 Flat Bullhead 272 220 0.2 3.7 0.46 0.16 5/25/2017 G_1 Flat Bullhead 281 260 0.2 2.4 1.17 0.17 5/25/2017 G 1 White Catfish 411 856 0.2 2.3 1.07 0.19 5/25/2017 G 1 White Catfish 335 550 0.2 0.9 0.46 0.17 5/25/2017 G 1 White Catfish 415 946 0.2 2.2 0.39 0.18 5/25/2017 B_3 Largemouth Bass 403 934 0.2 11.6 1.86 0.20 5/25/2017 B 1 Bluegill 161 70 0.2 8 1 0.46 0.18 5/25/2017 B 1 Bluegill 142 47 0.2 7.9 0.66 0.19 5/26/2017 G 1 Bluegill 207 198 0.2 3 0.96 0.20 5/26/2017 E 1 Bluegill 170 93 0.2 5.3 0.48 0.19 5/26/2017 E 1 Brown Bullhead 340 592 0.2 1.6 0.27 0.18 5/26/2017 E 1 Brown Bullhead 315 457 0.2 1.1 0.37 0.19 Sample Date Location Fish Species Length Weight As W/O Se W/O Hg (µg/g) Dry -to fresh weight ratio 5/26/2017 E_3 Bluegill 166 92 0.2 5 0.86 0.17 5/26/2017 E 3 Bluegill 175 109 0.2 3.9 0.45 0.19 5/26/2017 E 3 Bluegill 159 87 0.2 4.8 0.35 0.18 5/26/2017 E 3 Flat Bullhead 286 258 0.2 2.9 1 0.62 0.18 5/26/2017 E 3 Flat Bullhead 305 322 0.2 4.3 0.35 0.19 5/26/2017 E 3 Flat Bullhead 301 325 0.2 2.8 0.38 0.19 5/26/2017 E 3 Flat Bullhead 280 265 0.2 3.3 0.52 0.18 6/29/2017 G 1 Bluegill 198 143 0.2 3.6 1.07 1 0.19 6/29/2017 G 1 Bluegill 179 104 0.2 4.6 0.88 0.18 6/29/2017 G 1 Bluegill 199 133 0.2 4 0.54 0.17 6/29/2017 G 1 Bluegill 165 86 0.2 4.2 0.52 0.19 6/29/2017 B_3 Flat Bullhead 310 361 0.2 6.6 0.29 0.17 6/29/2017 B_3 White Catfish 365 660 0.2 3 0.39 0.16 6/29/2017 B 3 White Catfish 396 929 0.2 4 0.69 0.17 6/29/2017 B_3 White Catfish 439 1016 0.2 1.6 1 0.78 0.18 6/29/2017 B 3 Yellow Bullhead 289 312 0.2 5.1 0.75 0.18 8/22/2017 B_3 Bluegill 145 62 0.6 13.3 0.56 0.20 8/22/2017 B 3 Bluegill 192 130 0.2 5.5 0.44 0.17 8/22/2017 B_3 Bluegill 148 72 0.6 8.6 0.46 0.20 8/22/2017 B 3 Bluegill 158 76 0.9 9.1 0.41 0.23 8/22/2017 B_3 Bluegill 164 84 0.8 9.2 0.54 0.22 8/22/2017 B_3 Bluegill 153 60 0.5 8.2 0.52 0.21 8/22/2017 B 3 Brown Bullhead 181 76 0.2 3.1 0.27 1 0.19 8/22/2017 B 1 Bluegill 151 75 0.3 7.1 0.69 0.22 8/22/2017 B 1 Bluegill 148 56 0.4 6.7 0.82 0.19 8/22/2017 B 1 Bluegill 173 120 0.4 7.3 0.44 0.21 8/22/2017 B 1 Bluegill 168 91 0.2 8.4 0.27 0.20 8/22/2017 B_1 Largemouth Bass 290 352 0.2 5.9 0.45 0.22 8/22/2017 B_1 Largemouth Bass 228 157 0.2 6.9 0.43 0.21 8/22/2017 B 1 Largemouth Bass 322 476 0.2 8.1 0.92 0.21 8/22/2017 B 1 Largemouth Bass 225 142 0.2 6.7 0.72 0.21 8/22/2017 B 1 Largemouth Bass 1 177 78 1 0.2 1 4.7 1 0.71 0.20 Sample Date Location Fish Species Length Weight As (Pg/g) Se (N/g) Hg (Ng/g) Dry -to fresh weight ratio 4/3/2018 B 1 Largemouth Bass 373 814 0.23 4.3 0.98 0.19 4/3/2018 B 1 Largemouth Bass 342 644 0.27 6.3 1.2 0.18 4/3/2018 B_1 Largemouth Bass 367 762 0.22 5.5 1.1 0.19 4/3/2018 B_1 Largemouth Bass 410 983 0.5 7.3 1 0.87 0.18 4/3/2018 B 1 Largemouth Bass 374 744 0.23 4.7 0.72 0.20 4/3/2018 B_1 Yellow Bullhead 266 264 0.5 4.8 0.19 0.18 4/3/2018 B 3 White Catfish 341 550 0.67 7.1 0.17 0.16 4/3/2018 B 3 White Catfish 316 458 0.59 6.6 0.21 0.17 4/3/2018 B 3 White Catfish 301 408 0.52 9.4 0.14 0.20 4/3/2018 B 3 White Catfish 316 460 0.74 6.7 0.39 0.19 4/3/2018 G 3 Flat Bullhead 282 295 0.5 1.9 0.44 0.19 4/3/2018 G 3 Flat Bullhead 281 275 0.5 2 0.33 0.16 4/3/2018 G_3 Flat Bullhead 285 302 0.49 2.2 0.28 0.19 4/3/2018 G 3 Flat Bullhead 260 217 0.5 1.4 0.61 0.19 4/3/2018 G 3 Flat Bullhead 276 282 0.5 1.8 0.31 0.17 4/3/2018 G 3 Flat Bullhead 280 278 0.49 1.8 0.38 0.17 4/3/2018 G_3 Largemouth Bass 363 765 0.16 3.4 1.1 0.20 4/3/2018 G 3 Largemouth Bass 347 694 0.21 3 0.89 0.19 4/3/2018 B 1 Largemouth Bass 343 600 0.3 5.7 0.61 0.21 4/4/2018 B 1 Flat Bullhead 313 400 0.5 3.8 0.32 0.18 4/4/2018 B 3 Largemouth Bass 385 827 0.24 5.5 0.96 0.20 4/4/2018 B 3 Largemouth Bass 388 905 0.32 8 2.2 0.17 4/4/2018 B_3 White Catfish 333 510 0.43 7.5 0.27 0.19 4/4/2018 B_3 White Catfish 283 380 0.69 6.8 0.16 0.18 4/4/2018 G 1 Largemouth Bass 333 540 0.5 3.4 1.2 1 0.20 4/4/2018 G 1 Largemouth Bass 375 832 0.16 3.5 1.2 0.20 4/4/2018 G 1 Largemouth Bass 301 394 0.49 3.1 0.95 0.20 4/4/2018 G 1 Largemouth Bass 341 604 0.5 3.4 1.4 0.20 4/4/2018 G 3 Bluegill 164 87 0.5 2.1 0.34 0.18 4/4/2018 G 3 Bluegill 170 80 0.37 3.6 0.19 0.18 4/5/2018 B 3 Largemouth Bass 370 745 0.22 6.7 0.56 0.20 4/5,/2018 B 3 Largemouth Bass 388 940 0.26 4.3 0.59 0.22 5/22/2018 B 3 Bluegill 214 214 0.25 5 0.42 0.16 5/22/2018 B 3 Largemouth Bass 405 770 0.3 6.8 1.8 0.19 5/22/2018 B 3 Largemouth Bass 400 948 0.27 6.9 1 0.96 0.19 10/29/2018 B 1 Bluegill 186 119 0.45 5.9 0.19 0.18 10/30/2018 G 3 Bluegill 183 109 0.36 2.8 0.29 0.19 10/30/2018 G 3 Bluegill 186 112 0.26 2.8 0.47 0.18 10/30/2018 G_3 Bluegill 167 77 0.5 2.5 0.35 0.19 Sample Date location Fish Species Length Weight As (µg/g) Se (ig/g) Hg (ig/g) Dry -to fresh eigh rati 10/30/2018 G 3 Bluegill 181 95 0.5 2.3 0.23 0.19 10/30/2018 B_1 Bluegill 205 154 0.51 6 0.32 0.19 10/30/2018 B 3 Bluegill 182 100 0.48 4.2 0.18 0.19 10/30/2018 B 3 Bluegill 177 95 0.58 6.2 0.15 1 0.20 10/30/2018 B 3 Bluegill 177 95 0.35 5.4 0.4 0.18 10/30/2018 B_3 Bluegill 179 99 0.54 4.8 0.22 0.19 10/30/2018 B 3 Bluegill 164 75 0.55 6.2 0.19 0.20 11/19/2018 B 1 Bluegill 214 180 0.4 5.4 0.51 0.18 11/19/2018 B_1 Bluegill 188 103 0.56 6.6 0.28 0.18 11/19/2018 B_1 Bluegill 201 138 0.5 4.2 0.18 0.20 11/19/2018 B 1 Bluegill 179 91 0.63 6.2 0.18 0.19 11/19/2018 B 1 Flat Bullhead 242 155 0.33 4.2 0.14 0.18 11/19/2018 B 1 Flat Bullhead 283 288 0.23 4.3 0.32 0.19 11/19/2018 B 1 Flat Bullhead 253 212 0.16 3.3 0.28 0.17 11/19/2018 B 1 Flat Bullhead 249 188 0.32 3 0.3 0.17 Sample Date Location Fish Species Length Weight As (119/9) Se (µg/g) Hg (µg/g) Dry -to fresh weight ratio 4/3/2019 B_3 Redear Sunfish 227 181 0.83 9.22___+_ 0.3 0.21 4/3/2019 B_3 Redear Sunfish 212 139 0.9 7.45 0.3 0.20 4/3/2019 B_3 Redear Sunfish 220 150 0.85 5.93 0.3 0.20 4/3/2019 B 3 Redear Sunfish 240 215 0.8 5.47 0.31 0.21 4/3/2019 B 3 Redear Sunfish 236 200 0.93 6.63 0.37 0.19 4/3/2019 B_3 Redear Sunfish 246 225 0.79 7.64 0.3 0.19 4/3/2019 B_1 Largemouth Bass 377 774 0.92 7.05 0.71 0.20 4/3/2019 B_1 Largemouth Bass 361 728 0.87 5.91 0.86 0.21 4/3/2019 6 1 Redear Sunfish 237 190 0.95 9.21 0.5 0.20 4/3/2019 B 1 Redear Sunfish 233 175 1.12 7.55 0.41 0.19 4/3/2019 B 1 Redear Sunfish 249 218 0.82 12.23 0.3 0.19 4/3/2019 B_1 Redear Sunfish 231 171 1.07 7.19 0.59 4/4/2019 G_1 Largemouth Bass 346 684 0.84 4.15 1.02 _-0.17 0.20 4/4/2019 G 1 Redear Sunfish 195 105 0.86 3.99 1.27 0.18 4/4/2019 G 1 Redear Sunfish 205 123 0.81 4.37 1.34 0.18 4/4/2019 G 1 Redear Sunfish 226 151 0.87 4.78 0.91 0.17 4/4/2019 G 3 Largemouth Bass 320 424 0.9 3.54 0.7 0.21 4/4/2019 G 3 Largemouth Bass 336 556 0.86 3.41 0.68 0.22 4/4/2019 G 3 Largemouth Bass 354 665 1.11 3.46 0.91 0.21 4/4/2019 G 3 Largemouth Bass 379 814 0.93 3.47 0.93 0.20 4/4/2019 G 3 Largemouth Bass 341 629 0.96 3.4 0.73 0.21 4/4/2019 G 3 Redear Sunfish 210 146 0.89 4.73 0.32 0.19 4/4/2019 G 3 Redear Sunfish 225 181 1.02 4.2 0.4 0.19 4/4/2019 G_3 Redear Sunfish 208 137 0.85 4.6 0.3 0.20 5/8/2019 B_1 Redear Sunfish 245 233 0.95 11.66 0.8 0.20 5/8/2019 B_1 Redear Sunfish 195 111 0.98 8.77 0.36 0.20 5/9/2019 B_3 Largemouth Bass 405 758 1.06 9.17 1.79 0.21 5/9/2019 B_3 Largemouth Bass 381 739 1.01 6.68 0.79 0.17 5/9/2019 B 3 Largemouth Bass 370 702 0.89 7.24 0.66 0.19 5/9/2019 B 3 Largemouth Bass 305 391 0.99 1 6.37 0.55 0.21 5/9/2019 B 3 Largemouth Bass 354 518 0.85 6.84 0.65 0.21 5/9/2019 B 3 Largemouth Bass 355 636 0.97 4.8 0.63 0.20 5/9/2019 BT1 Largemouth Bass 368 613 0.91 5.14 0.71 0.21 5/9/2019 B 1 Largemouth Bass 290 333 1.02 4.94 0.42 0.21 5/9/2019 B 1 Largemouth Bass 415 1120 0.88 1 6.36 1 0.94 0.20 5/9/2019 B_1 Largemouth Bass 390 849 0.91 1 7.87 1 0.88 0.21 vtRGiNIA Mayo Crook ._.,. _...__..�...... NORD C.ARO[ " N Mgyo Lake Rd. 63 A °utw ti 02 +B 0 0.5 1 2 Mlles F f rule. 0 0.75 1.5 3 Kilorr►eten sauear+ �a Sampling Locations. _ Electrofishing Transacts 3 Y�d e� Public at Ramp aG o� G3 tit icy Rd. Mayo Steam Laws°0 Electric Plant NORTH CAROLINA Attachment 8 NPDES General Permit Renewal Guidance Letter with updated NCG120101 results jf DUKE d ENERGY® File: Mayo12520-R Ms. Bethany Georgoulias North Carolina Division of Environmental Quality 1628 Mail Service Center Raleigh, NC 27699-1628 Subject: Duke Energy Progress, LLC. Mayo Electric Generating Plant NPDES General Permit Renewal Guidance NCG 120101 Dear Ms. Georgoulias: September 6, 2018 Duke Energy 2500 Fairfax Road Greensboro, NC 27407 As recently discussed, Duke Energy requests guidance and clarification on the renewal of the NCG120101 general stormwater permit for the Mayo Steam Plant Monofill. The initial certificate of coverage was issued to Duke Energy on January 6, 2014. Coverage under this general permit was issued with amended conditions requiring additional sampling. Please advise if the renewal of the general permit will continue to require this augmented sampling schedule. The NCG120101 has been problematic with the requirement to monitor fecal coliform due to the abundant wildlife around the monofill. Duke Energy sought and received tier relief from monthly monitoring of fecal coliform from DEQ in December of 2017. Unlike the sanitary landfills the NCG12000 permit was developed for, the Mayo Monofill receives only coal combustion residuals with wildlife being the only possible source of fecal contamination. Duke Energy plans to request a modification of NPDES Industrial Stormwater Permit NCS000580 in the near future to include the three stormwater outfalls at the Mayo Monofill currently covered by permit NCG120101. The industrial activity at the monofill, transport of materials, is similar in nature to the activity at the Station's stormwater outfal1010. As you requested, included with this correspondence is all stormwater sampling data gathered under permit NCG 120101 to date from the Mayo Monofill for your review. Should you have any questions please contact me at Lori.Tollie@duke-energy.com or at 1-336-8544916. 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