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NCS000580_Insp Letter (Signed) with Report_20230519.docxROY COOPER Governor ELIZABETH S. BISER Secretary DOUGLAS R. ANSEL inrerim Director � y4 s s NOR I H CAROLVA Environmental Quality May 19, 2023 Duke Energy Progress, LLC ATTN: Tom Copolo 10660 Boston Road Roxboro, NC 27573 Subject: COMPLIANCE EVALUATION INSPECTION Duke Energy Progress, L.L.C. Mayo Facility, Certificate of Coverage-NCS000580 Person County Mr. Copolo; On April 26, 2023 a site inspection was conducted for the Mayo Steam Electric facility located at 10660 Boston Road, Person County, North Carolina. A copy of the Compliance Inspection Report is enclosed for your review. The site visit and file review revealed that the subject facility is covered by NPDES Individual Stormwater Permit-NCS000580. Permit coverage authorizes the discharge of stormwater from the facility to receiving waters designated as Mayo Reservoir a Class WS-W waterbody in the Roanoke River Basin. As a result of the inspection, the facility was found to be in compliance with the conditions of the NCS000580 Individaul permit. Please refer to the enclosed Compliance Inspection Report for additional comments and observations made during the inspection. Please be advised that violations of the NPDES Stormwater General Permit are subject to a civil penalty assessment of up to $25,000 per day for each violation. If you or your staff has any questions, comments, or needs assistance with understanding any aspect of your permit, please contact me at (919) 791-4200 or by e-mail at Thad.valentine@ncdenr.gov. Sincerely, Thad Valentine Environmental Senior Specialist � g North Carolina Depar trnent of Environmenta �l Quality Division of Energy. Mineral and Land Resources Q �/ Raleigh Regional Office 1628 Mail Service Center 13800 Barrelt Drive I Raleigh, North Carolina 27609 o�wesennw fmra�am aw� /�'� 919,7914200 Compliance Inspection Report Permit: NCS000580 Effective: 03/21/19 Expiration: 12/31/21 Owner: Duke Energy Progress LLC SOC: Effective: Expiration: Facility: Mayo Steam Electric Power Plant County: Person 10660 Boston Rd Region: Raleigh Roxboro NC 27573 Contact Person: Tom Copolo Title: Plant Manager Phone: 336-597-7307 Directions to Facility: System Classifications: SWNC, Primary ORC: Secondary ORC(s): On -Site Representative(s): Related Permits: Inspection Date: 04/26/2023 Entry Time I O:OOAM Primary Inspector: Thaddeus W Valentine Secondary Inspector(s): Reason for Inspection: Routine Permit Inspection Type: Stormwater Discharge, Individual Facility Status: Compliant ❑ Not Compliant Question Areas: Storm Water (See attachment summary) Certification: Phone: Exit Time: 12 15PM Phone: Inspection Type: Compliance Evaluation Page 1 of 4 Permit: NCS000580 Owner - facility: Duke Energy Progress LLC Inspection Date: 04/26/2023 Inspection Type: Compliance Evaluation Reason for Visit: Routine Inspection Summary: I meet with Leanne Wilson,Lori Tollie and others at the Mayo facility for Duke Energy to perform a stormwater complaince inspection. During this inspection I found that the permittee keeps very extensive and detailed records and documentation to meet the stormwater permit requirements. There were just a couple areas that I would request that specific attention be paid, to better capture and prevent any stormwater pollution issues. The site map was included with much of the information required, there were areas that should have been identified, such as the chlorine building, that were not shown on the map. Any areas with the potential for pollution to stormwater, along with any other areas required by the permit,should be shown on the map. Site inspections are done regularly, but there are some site specific areas with the potential to pollute stormwater that should be added to the checklist such as the chlorine building. Example: There are poly totes without secondary containment under the shed side of the building that have the potential to leak, spill or to crack and cause a spill that would be exposed to stormwater. There were chemicals stored next to the rollup door that could be a potential stormwater pollutant that should be stored in a safe location that would have been identified as an issue if that area was part of a checklist. Please provide checklist for all site specific areas with the potential to be a stormwater pollutant source. The request to combine the two stormwater permits for the monilift NCG120101 and the individual stormwater permit NCS000580 has been approved. The number system has been altered to reflect the requested removal of alphanumeric numbering as well as making the requested changes to the numbering for stormwater permit NCS000580. Outfall 002 is now 007 for that permit outfall. These changes will come effective at the renewal of your stormwater permit NCS000580. Also, at the same time as the renewal stormwater permit NCG120101 will be rescinded. Page 2 of 4 Permit: NCS000580 Inspection Date: 04/26/2023 Owner - Facility: Duke Energy Progress LLC Inspection Type : Compliance Evaluation Reason for Visit: Routine Stormwater Pollution Prevention Plan Does the site have a Stormwater Pollution Prevention Plan? # Does the Plan include a General Location (USGS) map? # Does the Plan include a "Narrative Description of Practices"? # Does the Plan include a detailed site map including outfall locations and drainage areas? # Does the Plan include a list of significant spills occurring during the past 3 years? # Has the facility evaluated feasible alternatives to current practices? # Does the facility provide all necessary secondary containment? # Does the Plan include a BMP summary? # Does the Plan include a Spill Prevention and Response Plan (SPRP)? # Does the Plan include a Preventative Maintenance and Good Housekeeping Plan? # Does the facility provide and document Employee Training? # Does the Plan include a list of Responsible Party(s)? # Is the Plan reviewed and updated annually? # Does the Plan include a Stormwater Facility Inspection Program? Has the Stormwater Pollution Prevention Plan been implemented? Yes No NA NE ■❑❑❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ N ❑ ❑ Comment: The plan has a detailed site map but I have asked that additional areas of thesite be added to the map such as the chlorine shop and any other activity areas such as that along with the outfall locations. Stomrwater facility inspections were provided but I recommend that inspection checklist for specific areas such as the Chlorine building be added to the checklists as a site specific checklist area along with any other areas that could potentially be a stormwater pollution discharge area. A list of significant spills should be added to the SWPPP Qualitative Monitoring Yes No NA NE Has the facility conducted its Qualitative Monitoring? ❑ ❑ ❑ Comment: Provided Analytical Monitoring Yes No NA NE Has the facility conducted its Analytical monitoring? N ❑ ❑ ❑ # Has the facility conducted its Analytical monitoring from Vehicle Maintenance areas? N ❑ ❑ ❑ Comment: Provided Permit and Outfalls Yes No NA NE # Is a copy of the Permit and the Certificate of Coverage available at the site? 0 ❑ ❑ ❑ # Were all outfalls observed during the inspection? M ❑ ❑ ❑ # If the facility has representative outfall status, is it properly documented by the Divis on? ❑ ❑ 0 ❑ # Has the facility evaluated all illicit (non stormwater) discharges? 0000 Comment: The outfalls were observed and alternate numbering was requested Page 3 of 4 Permit: NCS000580 Owner - Facility; Duke Energy Progress LLC Inspection Date: 04/26/2023 Inspection Type : Compliance Evaluation Reason for Visit: Routine Page 4 of 4