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NCS000580_MONITORING INFO_20191101Iz 0 STORMWATER DIVISION CODING SHEET NCS PERMITS PERMIT NO. 1 v C S v0 f DOC TYPE ❑FINAL PERMIT MONITORING REPORTS O APPLICATION ❑ COMPLIANCE ❑ OTHER DOC DATE I V I I U ❑Q0 YYYYMMDD `tc)D�KEEERGY, PROGRESS File: Mayo 12520-R NC Department of Environmental Quality Divi •ion of Water Quality A ENTION: Central Files 161 Mail Service Center Raleigh, North Carolina 27699-1617 October 28, 2019 Mayo Steam Plant Duke Energy Progress 10660 Boston Road Roxboro, NC 27574 Subject: 15A N. C. Admin. Code 213.0506 D Mayo Electric Generating Plant National Pollutant Discharge Elimination System Stormwater Permit NCS000580 Stormwater Discharge Outfalls 002 and 010 Monitoring Report Dear Sir or Madam: In accordance with Part III. Section E2 of NPDES Stormwater Permit Number NCS000580, enclosed is the year 3, September 2019 Stormwater Discharge monitoring report for Outfalls 002 and 010 for Duke Energy Progress, LLC. - NPDES Stormwater Permit Number NCS000580. To note, Outfalls 002 and 010 are in tiered status and there were no rain events for September during normal business hours. I certify, raider penalty of law, that this docu»tent and till ottachrrients were prepared itnder my direction or supervision in accordance titith a system designed to assure that grutlified personnel properly gather and evaluate the information submitted. Based on lily inquiry of the person or persons who manage the sysreni, or those persons directly responsible forgathering the information, the information submitted is, to the best of my knowledge crud belief, trite, accurate, and complete. I can aware that there are significant penalties for submitting false information, including the possibility of fines and imprisonment for- knowing violations. Please contact Ms. Lori Tollie at (336) 854-4916 if there are any questions concerning the data in this submittal. Sincerely, Tom Copolo- Manager Mayo Electric Generating Plant Enclosures LPWIIpw STORMWATER DISCHARGE OUTFALL (SDO) MONITORING REPORT Permit Number: NCS000580 SAMPLES COLLECTED DURING CALENDAR YEAR: 2019 (This monitoring report shall he received by the Division no later than 30 days from the date the facility receives the sampling results from the laboratory.) FACILITY NAME Mayo Electric Steam Plant PERSON COLLECTING SAMPLE(S) Joseph Heath Slade CERTIFIED LABORATORY(S) Duke, Shealy Lab# 248-& 329 _Mayo Plant Lab Lab #_5064_ Part A: Specific Monitoring Requirements COUNTY Person PHONE NO. (336) 597-7398 FSIGNATURE OF PERMITTEE OR DESIGNEE UIREU ON PAGE 3. Outfall No. Date Sample Collected 00400 39516 01119 00981 71901 01092 00530 Total Rainfall' pH', PCBs Copper' Total Selenium Total Mercury= Total Zinc' Total TSS Non -Polar Oil & Grease mo/dd/ r inches Standard MgA m MgA mg1l m m Benchmark 6-9 Detected 0.010 0.056 N/A= 0.126 100 15 002 NO FLOW See Comments 010 NO FLOW See Comments Outfall Additional Priority Pollutant Metals- 00999 01079 00978 00998 01113 01118 01074 01114 01268 00982 No. Boron' Ag' As Be Cd' Cr' Ni' Pb' Sb Tl' mg/I mg/I mg/I mg/I mg/I mg/1 mg/I mg/I mg/1 mg/I Benchmark N/A(monitor only) 0.0003 0.34 0.065 0.003 0.9 0.335 0.075 0.09 N/A (monitor only) 002 OI0 Form SWU-247, lust revised 2122012 Page 1 of 3 Footnotes: Permit #_NCS0005_80 (Part II Pate 7 of 15) 4. For each sampled measureable storm event, the total precipitation must be recorded. An on -site rain gauge is required. Where isolated sites are unmanned for extended periods of time, a local rain gauge reading may be substituted for an on -site reading. 5. These parameters shall be monitored only if coal or coal ash is transported through the drainage areas of these outfalls during the semi-annual monitoring period in Table 2. Footnotes: Permit # NCS000580 ( Part II Page 9 of 15 ) 1. Hardness- dependent. Benchmark based on translation of dissolved value into total recoverable with an assumed hardness of 25 mg/l and a total suspended solids (TSS) concentration of 10 mg/1, 2. Values above the North Carolina water quality standard for mercury (12 ng/1) should be noted on the DMR but do not trigger Tier responses. Concentrations infield blanks or method blanks associated with the sample may be subtracted from the results for thatsample, as long as all documentation of the adjustment is provided with the DMR. 3. If pH values outside this range are recorded in sampled stormwater discharges, but ambient precipitation pH levels are lower, then the lower threshold of this benchmark range is the pH of the precipitation (within instrument accuracy) instead of 6 S.U. Readings from an on -site or local rain gauge (or local precipitation data) must be documented to demonstrate background concentrations were below the benchmark pH range of 6- 9. Does this facility perform Vehicle Maintenance Activities using more than 55 gallons of new motor oil per month'? —yes _X_no (if yes, complete Part B) Part B: Vehicle Maintenance Activity Monitoring Requirements Outfall No. Date Sample Collected 50050 00556 00530 00400 Total Flow (i£ applicable) Total Rainfall Oil & Grease (if appl.) Non -polar O&G/TPH (Method 1664 SGT-HEM), if appl. Total Suspended Solids pH New Motor Oil Usage moldd/ r MG inches m mg,11 unit aUmo Form SWU-247. last revised 212/2012 Page 2 of 3 Comments: • Outfall 010: Tier One: No rain events for September during normal business hours. • Outfall 002: Tier Two: No rain events for September during normal business hours. STORM EVENT CHARACTERISTICS: Date Total Event Precipitation (inches): Event Duration (hours): (only if applicable — see permit.) (if more than one storm event was sampled) Date Total Event Precipitation (inches): Event Duration (hours): (only if applicable — see permit.) Mail Original and one copy to:_ Division of Water Quality Attn: Central riles 1617 Mail Service Center Raleigh, North Carolina 27699-1617 "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." (Signature of UJnittee) to14aliq (Date) Form SWU-247, fast revised 21212012 Page 3 of 3