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Home My WebLink AboutNC0038377-Duke Mayo-CEI-20210413 April 13, 2021 Tom Copolo, Plant Manager Duke Energy Steam Electric Power Plant 1660 Boston Road Roxboro, NC 27573 Subject: NPDES Compliance Evaluation Inspection Mayo Steam Electric Generating Plant NPDES Permit No. NC0038377 Person County Dear Mr. Copolo: On March 31, 2021, Stephanie Goss of the Raleigh Regional Office (RRO), conducted an inspection at the subject facility. The cooperation of Leanne Wilson, Lori Tollie, Heath Slade (ORC), and Sammy Carswell (Backup ORC) was appreciated. Findings during the inspection were as follows: 1. The current NPDES permit was issued effective August 1, 2019 and expires on July 31, 2023. 2. The Mayo Steam Electric Generating Plant is classified PC-1 and WW-2 and is permitted to discharge wastewater from the cooling towers and circulating water system and discharged directly into Mayo Reservoir via Outfall 001 and the ash pond via Outfall 002 (with wastewater from a variety of sources drained into Internal Outfalls 002A, 002B, 008, 009 and 011). 3. The plant discharges to receiving waters designated as Hyco Lake, classified as WS-V waters in the Roanoke River Basin. 4. A review of discharge monitoring report (DMR) data for the period December 2019 through January 2021 showed all required monitoring was performed and that the facility complied with all permit limits. 5. A cursory review of laboratory and DMR data for June 2020 showed consistent reporting of results. 6. A cursory review of calibration logs showed acceptable calibration for the on-site parameters pH and temperature. 7. All domestic wastewater is treated by a package plant with chlorine tablet disinfection. The effluent from the package plant discharges to Mayo Reservoir via Outfall 002. 8. The inspector observed all the outfalls during the inspection and no compliance issues were observed at the time of the inspection. Page 2 of 2 9. The ORC maintains a daily logbook which contains data such as temperature of Outfall 002, the package plant data, flow of Outfall 008 and collection of pH. 10. The right of way to the outfalls were well maintained. No visible impacts were observed immediately downstream of Outfall 002. 11. Special Order by Consent (SOC) No. S18-005: Ms. Wilson and Ms. Tollie noted that no violations had occurred under the SOC and that it would be recanted in 60-90 days. The facility is compliant with the NPDES permit conditions as a result of this inspection. If you have questions concerning this report please contact Stephanie Goss at 919-791-4256 or Stephanie.goss@ncdenr.gov. Sincerely, Vanessa E. Manuel, Assistant Regional Supervisor Water Quality Regional Operations Section Raleigh Regional Office Division of Water Resources, NCDEQ cc: RRO, SWP Laserfiche EPA United States Environmental Protection Agency Washington, D.C. 20460 Water Compliance Inspection Report Form Approved. OMB No. 2040-0057 Approval expires 8-31-98 Section A: National Data System Coding (i.e., PCS) Transaction Code NPDES yr/mo/day Inspection Type Inspector Fac Type 1 N 52 NC0038377 21/03/31 C S31112171819 20 21 66 Inspection Work Days Facility Self-Monitoring Evaluation Rating B1 QA ----------------------Reserved------------------- N67707172 73 74 75 80 Section B: Facility Data Name and Location of Facility Inspected (For Industrial Users discharging to POTW, also include POTW name and NPDES permit Number) Mayo Steam Electric Power Plant 10660 Boston Rd Roxboro NC 27573 Entry Time/Date Permit Effective Date Exit Time/Date Permit Expiration Date 09:00AM 21/03/31 18/08/01 Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s) /// Joseph Heath Slade/ORC/336-597-7398/ Other Facility Data 12:00PM 21/03/31 23/07/31 Name, Address of Responsible Official/Title/Phone and Fax Number Tom Copolo,10660 Boston Rd Roxboro NC 27574/Plant Manager/336-597-7307/Contacted No Section C: Areas Evaluated During Inspection (Check only those areas evaluated) Permit Flow Measurement Operations & Maintenance Records/Reports Self-Monitoring Program Facility Site Review Compliance Schedules Effluent/Receiving Waters Laboratory Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary) (See attachment summary) Name(s) and Signature(s) of Inspector(s)Agency/Office/Phone and Fax Numbers Date Stephanie Goss DWR/RRO WQ/919-791-4200/ Signature of Management Q A Reviewer Agency/Office/Phone and Fax Numbers Date EPA Form 3560-3 (Rev 9-94) Previous editions are obsolete. Page#1 4/13/2021 DocuSign Envelope ID: BE2AEAC9-11E6-4419-A30E-6B16C6F608FA 4/13/2021 NPDES yr/mo/day 21/03/31 Inspection Type C3111218 1 Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary) 1.The current NPDES permit was issued effective August 1, 2019 and expires on July 31, 2023. 2.The Mayo Steam Electric Generating Plant is classified PC-1 and WW-2 and is permitted to discharge wastewater from the cooling towers and circulating water system and discharged directly into Mayo Reservoir via Outfall 001 and the ash pond via Outfall 002 (with wastewater from a variety of sources drained into Internal Outfalls 002A, 002B, 008, 009 and 011). 3.The plant discharges to receiving waters designated as Hyco Lake, classified as WS-V waters in the Roanoke River Basin. 4.A review of discharge monitoring report (DMR) data for the period December 2019 through January 2021 showed all required monitoring was performed and that the facility complied with all permit limits. 5.A cursory review of laboratory and DMR data for June 2020 showed consistent reporting of results. 6.A cursory review of calibration logs showed acceptable calibration for the on-site parameters pH and temperature. 7.All domestic wastewater is treated by a package plant with chlorine tablet disinfection. The effluent from the package plant discharges to Mayo Reservoir via Outfall 002. 8.The inspector observed all the outfalls during the inspection and no compliance issues were observed at the time of the inspection. 9.The ORC maintains a daily logbook which contains data such as temperature of Outfall 002, the package plant data, flow of Outfall 008 and collection of pH. 10.The right of way to the outfalls were well maintained. No visible impacts were observed immediately downstream of Outfall 002. 11.Special Order by Consent (SOC) No. S18-005: Ms. Wilson and Ms. Tollie noted that no violations had occurred under the SOC and that it would be recanted in 60-90 days NC0038377 17 (Cont.) Page#2 DocuSign Envelope ID: BE2AEAC9-11E6-4419-A30E-6B16C6F608FA Permit:NC0038377 Inspection Date:03/31/2021 Owner - Facility: Inspection Type: Mayo Steam Electric Power Plant Compliance Evaluation Compliance Schedules Yes No NA NE Is there a compliance schedule for this facility? Is the facility compliant with the permit and conditions for the review period? Comment: Operations & Maintenance Yes No NA NE Is the plant generally clean with acceptable housekeeping? Does the facility analyze process control parameters, for ex: MLSS, MCRT, Settleable Solids, pH, DO, Sludge Judge, and other that are applicable? Comment: Permit Yes No NA NE (If the present permit expires in 6 months or less). Has the permittee submitted a new application? Is the facility as described in the permit? # Are there any special conditions for the permit? Is access to the plant site restricted to the general public? Is the inspector granted access to all areas for inspection? Comment: Record Keeping Yes No NA NE Are records kept and maintained as required by the permit? Is all required information readily available, complete and current? Are all records maintained for 3 years (lab. reg. required 5 years)? Are analytical results consistent with data reported on DMRs? Is the chain-of-custody complete? Dates, times and location of sampling Name of individual performing the sampling Results of analysis and calibration Dates of analysis Name of person performing analyses Transported COCs Are DMRs complete: do they include all permit parameters? Has the facility submitted its annual compliance report to users and DWQ? Page#3 DocuSign Envelope ID: BE2AEAC9-11E6-4419-A30E-6B16C6F608FA Permit:NC0038377 Inspection Date:03/31/2021 Owner - Facility: Inspection Type: Mayo Steam Electric Power Plant Compliance Evaluation Record Keeping Yes No NA NE (If the facility is = or > 5 MGD permitted flow) Do they operate 24/7 with a certified operator on each shift? Is the ORC visitation log available and current? Is the ORC certified at grade equal to or higher than the facility classification? Is the backup operator certified at one grade less or greater than the facility classification? Is a copy of the current NPDES permit available on site? Facility has copy of previous year's Annual Report on file for review? Comment: Flow Measurement - Effluent Yes No NA NE # Is flow meter used for reporting? Is flow meter calibrated annually? Is the flow meter operational? (If units are separated) Does the chart recorder match the flow meter? The effluent flow meter is a staff gauge.Comment: Pump Station - Influent Yes No NA NE Is the pump wet well free of bypass lines or structures? Is the wet well free of excessive grease? Are all pumps present? Are all pumps operable? Are float controls operable? Is SCADA telemetry available and operational? Is audible and visual alarm available and operational? Comment: Equalization Basins Yes No NA NE Is the basin aerated? Is the basin free of bypass lines or structures to the natural environment? Is the basin free of excessive grease? Are all pumps present? Are all pumps operable? Are float controls operable? Are audible and visual alarms operable? Page#4 DocuSign Envelope ID: BE2AEAC9-11E6-4419-A30E-6B16C6F608FA Permit:NC0038377 Inspection Date:03/31/2021 Owner - Facility: Inspection Type: Mayo Steam Electric Power Plant Compliance Evaluation Equalization Basins Yes No NA NE # Is basin size/volume adequate? Comment: Aeration Basins Yes No NA NE Mode of operation Type of aeration system Is the basin free of dead spots? Are surface aerators and mixers operational? Are the diffusers operational? Is the foam the proper color for the treatment process? Does the foam cover less than 25% of the basin’s surface? Is the DO level acceptable? Is the DO level acceptable?(1.0 to 3.0 mg/l) Comment: Secondary Clarifier Yes No NA NE Is the clarifier free of black and odorous wastewater? Is the site free of excessive buildup of solids in center well of circular clarifier? Are weirs level? Is the site free of weir blockage? Is the site free of evidence of short-circuiting? Is scum removal adequate? Is the site free of excessive floating sludge? Is the drive unit operational? Is the return rate acceptable (low turbulence)? Is the overflow clear of excessive solids/pin floc? Is the sludge blanket level acceptable? (Approximately ¼ of the sidewall depth) Comment: Disinfection-Tablet Yes No NA NE Are tablet chlorinators operational? Are the tablets the proper size and type? Number of tubes in use? Page#5 DocuSign Envelope ID: BE2AEAC9-11E6-4419-A30E-6B16C6F608FA Permit:NC0038377 Inspection Date:03/31/2021 Owner - Facility: Inspection Type: Mayo Steam Electric Power Plant Compliance Evaluation Disinfection-Tablet Yes No NA NE Is the level of chlorine residual acceptable? Is the contact chamber free of growth, or sludge buildup? Is there chlorine residual prior to de-chlorination? At domestic wastewater treatment plant.Comment: Page#6 DocuSign Envelope ID: BE2AEAC9-11E6-4419-A30E-6B16C6F608FA