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NCS000580_MONITORING INFO_20181220lauD STORMWATER DIVISION CODING SHEET NCS PERMITS PERMIT NO. i Vc� 000sw DOC TYPE El FINAL PERMIT LY�MONITORING REPORTS ❑ APPLICATION ❑ COMPLIANCE ❑ OTHER DOC DATE ❑ DID, YYYYMMDD DUKE ENERGY, PROGRESS File: Mayo 12520--R Datc: 12/1 1/18 Mayo Steam Plant Duke Energy Progress 10660 Boston Road Roxboro, NC 27574 NC Division of Environmental Management Division of Water Quality »..; Wit. ATTENTION: Central Files giEk � 1 1617 Mail Service Center DEC 2 0 2018 Raleigh, North Carolina 27699-1617 CENTRtQ- FlLC:< , Subject: 15A N. C. Admin. Code 2B .0506 UUVrZ Sf:-;TIO�J Mayo Electric Generating Plant National Pollutant Discharge Elimination System Stormwater Permit NCS000590 Stormwater Discharge Outfalls 006A and 010 Monitoring Report Dear Sir or Madam: In accordance with Part III. Section E2 of NPI)ES Stormwater Permit Number NCS000580, enclosed is the year 2, period 2 , 2018 Storn»vater Discharge monitoring report for OutfalIS 006A and 010 for Duke Energy Progress, LLC. - NPDES Stormwater Permit Number NCS000580. 1 cerl fjy, under penalt,�� of 1tnv, that this document and all attaclmiews tivere prepared under my direction or supervision in accordance ivith tr s_ystent designed to assure that qualified personnel properly gather and evahuae the information submitted. Based on my inquire, of the person or persons who manage the sl'stenr, or those persons directly responsible for gathering the information, the information submitted is, to the best of m , knotOedge card belief, true, accurate, and complete. I am wi-are chat there are significant penalties for submitting false information, including the possibility offines and imprisonment for knowing i,iolutions. 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 STORIIWATER DISCHARGE OUTFALL (SDO) MONITORING REPORT Permit Number: NCS000580 SAMPLES COLLECTED DURING CALENDAR YEAR: 2018 (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 NAINIE Mayo Electric Steam Plant PERSON COLLECTING SAMPLE(S) Joseph Heath Slade CERTIFIED LABORATORY(S) Pace Lab #_40/503/530 _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 ' t 00400 01119 00981 700V 01092 00530 Total Rainfalls' pH' Copper Total Selenium Total' Mercury Total- Zinc Total, TSS Non -Polar. Oil & Grease mo/dd/ r ; inches I Standard mgA m MO m m m Benchmark 6-9 0.010 0.056 N/A- 0.126 100 15 010 11/05/2018 1.57 6.20 0.0035 ND<0.00031 0.0000134 0.0082 17.9 ND<1.1 6A 11/05/2018 1.57 6.43 0.0041 ND<0.00031 0.000410909 0.0134 10.0 ND<I.l Outfall Additional Priority Pollutant Metals' . 00999 01079 00978 00998 01113 01118 01074 01114 01268 00982 No. Boron' Ag As Be Cd Cr Nir Pb Sb TV mg/1 mg/1 mg/l mg/1 mg/l mg/l mg/l mg/l mg/l mg/I Benchmark NIA(monitor only) 0.0003 0.34 0.065 0.003 0.9 0.335 0.075 0.09 N/A(monitor only) 010 0.0117 ND<0.00007 0.00042 0.000082 ND<0.001105 0.0028 0.0019 0.0013 ND<0.0001 ND<0.000015 6A 0.0111 ND<0.00007 0.00029 0.000048 ND<0.00005 0.0016 0.0015 0.00078 ND<0.0001 ND<0.000015 Form SWU-247, last re+,ised 2/2/2012 Page l of 3 Footnotes:"=Perrnit # NCS000580 (Part>ILPage 7 of. 55) 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. Fo6t6oteT71?erritit"#',NCS0005809of•151 1. Hardness- dependent. Benchmark based on translation of dissolved value into total recoverable with an assumed hardness of 25 mg/1 and a total suspended solids (TSS) concentration of 10 mg/l. 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 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 Activity 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/dd/ •r N I G inches m m unit gallmo Form SWU-247. Iasi revised 21212012 Page 2 of 3 Comments: Footnote 2 : Permit # NCS000580 ( Part II Page 9 of 15 ) Mercury value for outfal1 010 on 1 1/05/2018 was 13.4 ng/l which is over the North Carolina water quality standard for Mercury of 12 ng/l. STORM EVENT CHARACTERISTICS: Date _11105/2018 Total Event Precipitation (inches): 1.57 Event Duration (hours): _6_ (only if applicable — see permit.) (if more than one storm event wits sampled) Date Total Event Precipitation (inches): Event Duration (hours): (only if applicable — see permit.) Mail Original and one copy to: Division of Water Quality Attw 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." <7- T, (Signature of 191%� /l% (Date) Form SWU-247, last revised 2�2/2012 Pa,e 3 of 3