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NCS000580_MONITORING INFO_20190424STORMWATER DIVISION CODING SHEET NCS PERMITS PERMIT NO. NL� o DOC TYPE ❑FINAL PERMIT �(,MONITORING REPORTS 0 APPLICATION ❑ COMPLIANCE ❑ OTHER DOC DATE oc� 01 � D v a y YYYYMMDD DUKE ENERGY, PROGRESS File: Mayo 12520-R NC Department of Environmental Quality Division of Water Quality A ENTION: Central Files 1617 Mail Service Center Raleigh, North Carolina 27699-1617 Mayo Steam Plant Duke Energy Progress 10660 Boston Road Roxboro, NC 27574 April 17, 2019 P ECF to y CEN 1 L FILES DWR S C-VON Subject: 15A N. C. Admin. Code 213.0506 Mayo Electric Generating Plant National Pollutant Discharge Elimination System Stormwater Permit NCS000580 Stormwater Discharge OUtfilllS 002, 006A and 010 Monitoring Report Dear Sir or Madam: In accordance with Part II1. Section E2 of NPDES Stormwater Permit Number NCS000580, enclosed is the year 3, period I, 2019 Stormwater Discharge monitoring report for Outfalls 002, 006A and 010 for Duke Energy Progress, LLC. - NPDES Stormwater Permit Number NCS000580. L certify, under penalty of law, that this document and all attachments were prepared muter my direction or supervision in accordance with a system designed to assure that gtralifted persotrtrel properly gather and evaluate the information submitted. Based on my inquire 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 ant aware that there are sigrtificttrrt pentrlties for'srrbrrrrttrrrg jCilse infornmtiotr, including the possibility of fines and inrprisonrnent for knowing violatinns. 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 LPW/Ipw r) STORMWATER DISCHARGE OUTFALL (SDO) MONITORING REPORT Permit Number: NCS000580 SAMPLES COLLECTED DURING CALENDAR YEAR: 2019 (This monitoring report shall be 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 SIGNATURE OF PERMITTEE OR DESIGNEE REQUIRED ON PAGE 3. Outfall No. Date Sample Collected,' 00400 01119 00981 71901 01092 00530 Total Rainfal14 pH' Copper' Total Selenium Total Mercury Total Zinc' Total TSS Non -Polar Oil & Grease mo/dd/vr inches Standard m m mgA m m m Benchmark 6-9 0.010 0.056 NIA'- 0.126 100 15 002 See comments 006A 03/21/19 07:15 1.21 6.15 0.00446 <0.001 0.0000181 0.020 62 <5.0 010 03/21/19 07:45 1.21 6.09 0.00492 <0.001 0.0000291 0.019 150 <5.0 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 TV mg/l mg/l mg/1 mg/l mg/l mg/1 mg/l mg/l mg/l mg/l 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 See comments 006A <0.05 <0.0002 <0.001 <0.001 <0.001 0.00313 0.00194 0.00142 <0.001 <0.0002 O10 <0.05 <0.0002 <0.001 <0.001 <0.001 0.00761 0.00310 0.00316 <0.001 <0.0002 Form SWU-247, last revised 21212012 Page I of 3 Footnotes: Permit # NCS000580 (Part II Page 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. S. 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 Pane 9 of 15 ) 1. Hardness- dependent. Benchmark based on translation of dissolved value into total recoverable with an assumed hardness of 25 mg/I and a total suspended solids (TSS) concentration of 10 mg/I. 2. Values above the North Carolina water quality standard for mercury (12 ng/1) should be noted on the DM R but do not trigger Tier responses. Concentrations infield blanks or method blanks associated with the sample may be subtracted from the results for that sample, 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 Activitv Monitoring Requirements Outfall No. Date Sample Collected 50050 00556 00530 00400 Total Flow (if 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 mo/ddh r 1IG inches m mgA unit allmo Form SWU-247, last revised 21212012 Pa,ye 2 of 3 Comments: Footnote 2: Permit # NCS000580 (Part II Page 9 of 15) • Mercury value for outfall 006A on 03/21/19 was 18.1 ng/l which is over the North Carolina water quality standard for Mercury or 12 ng/l. • Mercury value for outfall 010 on 03/21/19 was 29.2 ngA which is over the North Carolina water quality standard for Mercury of 12 ng/l. • Revision made to permit to include new 002. Permit was amended and signed on 3/21/19. There was no rain event from 3/21/19 to 3/31/19 during normal operating hours. STORM EVENT CHARACTERISTICS: Date 03/21/2019 Total Event Precipitation (inches): 1.21 Event Duration (hours): _5_ (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 Files 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." of Pe (Date) Form SWU-247, last revised 2/2/2012 Page 3 of 3