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NCS000546_MONITORING REPORT_20201214Allen Steam Station DUKE ENERGY December 8, 2020 NCDEQ, Mooresville Regional Office Attn: DEMLR Stormwater Program 610 East Center Ave., Suite 301 Mooresville, N.C. 28115 1 Moa(sa�aFtiR sDjiiQa -,D, 10 Reyo o�r,� P Subject: Duke Energy Carolinas, LLC NPDES Storm Water Discharge Monitoring Report for: Allen Steam Station — NCS000546 — Gaston County Duke Energy 253 Plant Allen Rd. Belmont, NC 28012 In accordance with Part III, E(2) of the above referenced NPDES Storm Water permit, the original and one copy of the monthly monitoring reports are attached. The samples collected are required monthly due to Tier Two or Tier Three Status. The period for sampling ended November 30, 2020. Samples were collected for the period at outfalls SW007, SW009, SW010, SW016, SW018 and SW020 on November 11, 2020. The laboratory analysis results were received on November 24, 2020. Duke Energy has performed the steps required by the Tier II and Tier III for these outfalls. There was no sample collected at outfalls SW001, SW013-10 and SW013-13 for the period, due to No Qualifying Flow condition. Outfalls SW008 and SW015 were sampled on November 11, 2020 and the analysis results are included on this DMR. Analytes sampled above the benchmark values for analytical monitoring are as follows. Outfall Parameter Result Benchmark W007 Zinc 0.193 m /L 0.126 m /L SW016 Copper 0.0153 m /L 0.010 m /L SW016 TSS 140 m /L 100 m /L W018 Copper 0.0128 m /L 0.010 m /L W020 Copper 0.0149 m /L 0.010 m /L SW020 I TSS 1 130 m /L I 100 m /L All values reported on the attached reports are dependent on the accuracy of approved analytical methods used to measure parameters. Allen Steam Station DUKE ENERGY, Duke Energy 253 Plant Allen Rd. Belmont, NC 28012 Please direct any correspondence or questions concerning the Allen Steam Station NPDES Storm Water Program to Elizabeth Glenn (980) 373-0530 or Randy Gantt (704) 829-2587. Yours truly, Rick R. Roper, General Manager III Allen Steam Station Duke Energy Carolinas, LLC Attachments bc: w/attachment Elizabeth Glenn UPS Tracking: 1Z X67 601 42 9720 9493 STORMWATER DISCHARGE OUTFALL (SDO) MONITORING REPORT Permit Number NCS000546 FACILITY NAME Allen Steam Station PERSON COLLECTING SAMPLE(S) Dan Diffenbach/Steve Hamilton CERTIFIED LABORATORY(S) Duke Enerev Carolinas, LC Lab # 248 Pace Analytical Services Lab #329 Part A: Specific Monitoring Requirements SAMPLES COLLECTED DURING CALENDAR YEAR: 2020 (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.) s 1, o COUNTY Gaston 'oz n PHONE NO. (704 ) 860-4945 p d v �. 194Fri PP owz - N SIGNATURE OF PERMITTEE OR DESIGNEE 0' o REQUIRED ON PAGE 3. Outfall Date 50050 00400 101002 101622 Inifivy 01027 No. Sample Total Total pH Silver, Total (as I Arsenic, Total Boron, Total Beryllium, Cadmium, Collected Flow (if app.) Rainfall A) (as As) (as B) Total (as Be) Total (as Cd) mo/dd/yr MG inches SW001 N/A N/A m m m m m NO UALIFYING FLOW FOR THE MONTH OF NOVEMBER 2020 SW007 11/11/20 N/A 0.46 8.3 <0.0002 0.00155 <0.05 <0.001 <0.001 SWOUS 11/11/20 N/A 0.46 8.5 <U.0002 <0.001 <0.05 <0.001 <0.001 SWO09 11/11/20 N/A 0.46 7.9 <O.0002 0.00142 <U.OS <0.001 <0.001 SW010 11/11/20 N/A 0.46 8.1 <O.O002 0.00218 <U.05 <0.001 <0.001 SW013-10 N/A N/A NO QUALIFYING FLOW FOR THE MONTH OF NOVEMBER 2020 SWO13-13 N/A I N/A NO QUALIFYING FLOW FOR THE MONTH OF NOVEMBER 2020 SWO15 11/11/20 N/A 0.46 7.5 <0.0002 0.00329 0.407 <0.001 <0.001 SWO16 11/11/20 N/A 0.46 7.9 <0.0002 0.0115 <O.US <0.001 <0.001 SWO18 11/11/20 N/A 0.46 7.6 <0.0002 <0.001 <0.05 <0.001 <UAUI SW020 11/11/20 N/A 6. 66 7.9 <0.0002 0.00138 <U.OS <0,001 <O.001 Outfall Date 01034 01042 1 01067 101051 01097 101147 01059 U1092 No. Sample Chromium, Copper, Nickel, Total Lead, Total (as Antimony, Selenium, Total Thallium, Z. Total (as Collected total (as Cr) Total (as Ni) Ph) Total (as Sb) (as Se) (Total as TI) Zn) (as Cu) mo/dd/yr I mg/L mg/L m L m m L m SWU01 N/A m m NO QUALIFYING FLOW FOR THE MONTH OF NOVEMBER 2020 SWO07 11/11/20 O.00110 O.OU271 <0.U01 <0.UU1 <U.(in 1 <U.OUl I <O.U002 0.193 SWO08 11/11/20 <0.001 0.00423 <0.001 I <0.001 <0.001 0.00167 <0.0002 0.011 SW009 11/11/20 <0.001 0.00198 <O.UU1 <U.0U1 <U.001 10.00610 <0.0002 0.076 SWO10 11/11/20 0.00210 O.0077U 0.00175 <O.OUl <U.001 10.0108 <0.0002 0.022 SWO13-10 N/A NO QUALIFYING FLOW FOR THE MONTH OF NOVEMBER 2020 SWO13-13 N/A NO QUALIFYING FLOW FOR THE MONTH OF NOVEMBER 2020 SWO15 11/11/20 <0.001 I 0.00181 10.00154 1 <0.001 <U.OUl < 1.001 <0.0002 0.028 Permit Number NCS000546 Form SWU-247, last revised 611212015 Page I ol'3 utfall No. Date Sample Collected 01034 01042 01067 01051 01097 01147 01059 01092 Chromium, total (as Cr) Copper, Total (as Cu) Nickel, Total (as NO Lead, Total (as Pb) Antimony, Total (as Sb) Selenium -,,Total (as Se) Thallium, (Total as TI) Zinc, Total (as Zn) mo/dd/yr mg/L mg/L mg/L mg/L mg/L mg/L m mg/L SWO16 11/11/20 0.00876 0.0153 0.00764 0.00522 0.00126 0.00229 <0.0002 0.090 SWO18 11/11/20 <0.001 0.0128 <0.001 0.00198 <U.001 <0.001 <0.0002 0.090 SW020 11/11/20 0.00516 0.0149 0.00349 0.00356 <U.001 <0.001 <0.0002 0.048 Outfall No. Date Sample Collected 71900 C0530 00556 Mercury, Total, Method 1631E Solids, Total Suspended - Concentration Oil & Grease mo/dd/yr ng/L mg/L mg/L SWOOI N/A NO QUALIFYING FLOW FOR THE MONTH OF NOVEMBER 2020 SWO07 11/11/20 1.30 68 SWO08 11/11/20 1.77 <2.5 SW0t19 11/11/20 1.13 <2.5 SWOW 11/11/20 2.18 110 SWO13-10 N/A NO QUALIFYING FLOW FOR THE MONTH OF NOVEMBER 2020 SWO13-13 N/A NO QUALIFYING FLOW FOR THE MONTH OF NOVEMBER 2020 SWO15 11/11/20 1.46 <2.5 SWO16 11/11/20 20.2 140 SWO18 11/11/20 4.30 Avg. 13 <5.0 SW020 11/11/20 11.0 1130 Avg -Average of primary and duplicate mercury samples for SWO 18 (4.32 no and 4.28 ng/L = 4.30 ng/L). Benchmark exceedances include Zinc at SWO07; Copper at SWO16, SWO18 and SW020; TSS at SWO16 and SW020. Nate: The Hg result for outlall SWO16 was 20.2 no/L. This Ho value is above the 12 ng/L North Carolina water duality standard for mercury and is noted on this DMR but does not trigger a 'Pier response. Permit Number NCS000546 Form SWU-247, last revised 011212015 Page 2 of 3 Does this Facility perform Vehicle Maintenance Activities using more than 55 gallons of new motor oil per month? 0 yes C:; no (if yes, complete Part B) Part B: Vehicle Maintenance Activitv Monitoring Reouirements 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/yr MG inches mg/I mg/I unit gal/mo STORM EVENT CHARACTERISTICS: Date 11/11/20 Total Event Precipitation (inches): 0.46 Event Duration (hours): (only it 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 Energy Mineral and Land Resources 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." Z (Dat Permit Number NCS000546 Form SWU-247, lust revised 611212015 Page 3 of 3