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NCS000546_MONITORING REPORT_20210115AKE P ENERGY January 13, 2021 NCDEQ, Mooresville Regional Office Attn: DEMLR Stormwater Program 610 East Center Ave., Suite 301 Mooresville, N.C. 28115 Subject: Duke Energy Carolinas, LLC NPDES Storm Water Discharge Monitoring Report for: Allen Steam Station — NCS000546 — Gaston County Allen Steam Station 253 Plant Allen Rd. Belmont, NC 28012 704 829-2587 RECEIVED JAN 15 2021 o:;ies�i�ie Fegwna� 0ifice 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 December 31, 2020. Samples were collected for the period at outfalls SW007, SW009, SW010, SW016, SW018 and SW020 on December 14, 2020. The laboratory analysis results were received on December 29, 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, SWO13-10 and SW013-13 for the period, due to No Qualifying Flow condition. Outfalls SW002, SWO08 and SW015 were sampled on December 14, 2020 and the analysis results are included on this DMR. This DMR also contains the NO FLOW status of outfalls during the period of October 1, 2020 through December 31, 2020. Analytes sampled above the benchmark values for analytical monitoring are as follows. Outfall Parameter Result Benchmark SWO07 Zinc 0.283 mg/L 0.126 mg/L SW010 Copper 0.0104 mg/L 0.010 mg/L SW020 TSS 2200 mg/L 100 mg/L W020 Copper 0.288 mg/L 0.010 mg/L W020 Zinc 0.395 mg/L 0.126 mg/L All values reported on the attached reports are dependent on the accuracy of approved analytical methods used to measure parameters. 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 be: w/attachment Elizabeth Glenn UPS Tracking: 1Z X67 601 42 9293 1283 STORMWATER DISCHARGE OUTFALL (SDO) MONITORING REPORT Permit Number NCS000546 FACILITY NAME Allen Steam Station PERSON COLLECTING SAMPLE(S) Josh Sexton/Steve Hamilton CERTIFIED LABORATORY(S) Duke Energy 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.) e_ 1 COUNTY Gaston a PHONE NO. ( 704 ) 860-4945 Cdt ev `- SIGNATURE OF PERMITTEE OR DESIGNEE REQUIRED ON PAGE 4. Outfall Date 50050 00400 01077 01002 01022 01012 01027 No. Sample Collected Total Flow (if app.) Total Rainfall pH Silver, Total (as A) Arsenic, Total (as As) Boron, Total (as B) Beryllium, Total (as Be) Cadmium, Total (as Cd) mo/dd/yr MG inches m m m mg1L m SW001 N/A N/A NO QUALIFYING FLOW FOR THE MONTH OF DECEMBER 2020 SWOOIA N/A N/A NO QUALIFYING FLOW FOR OCTOBER 1, 2020 - DECEMBER 31, 2020 SW002 12/14/20 N/A 0.43 17.6 1 <0.0002 1 <0.001 1 <0.05 <0.001 <0.001 SW003 N/A N/A NO QUALIFYING FLOW FOR OCTOBER 1, 2020 - DECEMBER 31, 2020 SW005 N/A /A NO QUALIFYING FLOW FOR OCTOBER 1, 2020 - DECEMBER 31, 2020 SW007 12/14/20 /A 0.43 7.6 <0.0002 <0.001 <0.05 <0.001 <0.001 SW008 12/14/20 N/A 0.43 7.7 <0.0002 <0.001 <0.05 <0.001 <0.001 SW009 12/14/20 N/A 0.43 7.4 <0.0002 0.00179 <0.05 <0.001 <0.001 SW010 12/14/20 N/A 0.43 7.2 <0.0002 0.00399 <0.05 <0.001 <0.001 SW013-07 N/A /A NO QUALIFYING FLOW FOR OCTOBER 1, 2020 - DECEMBER 31, 2020 SW013.08 N/A N/A NO QUALIFYING FLOW FOR OCTOBER 1, 2020 - DECEMBER 31, 2020 SW013-09 N/A N/A NO QUALIFYING FLOW FOR OCTOBER 1, 2020 - DECEMBER 31, 2020 SW013.10 N/A N/A NO QUALIFYING FLOW FOR THE MONTH OF DECEMBER 2020 SW013-11 N/A N/A NO QUALIFYING FLOW FOR OCTOBER 1, 2020 - DECEMBER 31, 2020 SW013-12 N/A N/A NO QUALIFYING FLOW FOR OCTOBER 1, 2020 - DECEMBER 31, 2020 SW013.13 N/A /A NO QUALIFYING FLOW FOR THE MONTH OF DECEMBER 2020 SW013-14 N/A /A NO QUALIFYING FLOW FOR OCTOBER 1, 2020 - DECEMBER 31, 2020 SW013-15 N/A N/A NO UALIFYING FLOW FOR OCTOBER 1, 2020 -DECEMBER 31, 2020 SWO15 12/14/20 N/A 0.43 17.5 1 <0.0002 10.0218 10.186 <0.001 I <11.1101 SW016 12/14/20 N/A 0.43 7.3 <0.0002 0.00106 <0.05 <0.001 <0.001 SW018 12/14/20 N/A 0.43 7.3 <0.0002 1 <0.001 <0.05 1 <0.001 <0.001 SW020 12/14/20 1 N/A 0.43 17.6 1 <0.0002 10.00277 1 <0.05 10.00344 1 <0.001 Permit Number NCS000546 Form SWU-247, last revised 61122015 Page 1 of 4 Outfall No. Date Sample Collected 01034 01042 01067 01051 01097 01147 01059 01092 Chromium, total (as Cr) Copper, Total (as Cu) Nickel, Total (as Ni) 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 m m m m m m SW001 NIA NO QUALIFYING FLOW FOR THE MONTH OF DECEMBER 2020 SWOOIA NIA NO QUALIFYING FLOW FOR OCTOBER 1, 2020 - DECEMBER 31, 2020 SWO02 12/14/20 <0.001 0.00526 0.00117 <0.001 <0.001 <0.001 <0.0002 10.055 SWO03 NIA NO QUALIFYING FLOW FOR OCTOBER 1, 2020 - DECEMBER 31, 2020 SWO05 NIA NO QUALIFYING FLOW FOR OCTOBER 1, 2020 - DECEMBER 31, 2020 SWO07 12/14/20 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.0002 0.283 SWO08 12/14/20 0.00103 0.00384 0.00122 <0.001 <0.001 <0.001 <0.0002 0.022 SWO09 12/14/20 0.00114 0.00398 0.00125 0.00270 <0.001 0.00471 <0.0002 0.105 SWO10 12/14/20 0.00408 0.0104 0.00694 10.00313 <0.001 10.00362 <0.0002 0.050 SWO13-07 N/A NO QUALIFYING FLOW FOR OCTOBER 1, 2020 - DECEMBER 31, 2020 SWO13-08 N/A NO QUALIFYING FLOW FOR OCTOBER 1, 2020 - DECEMBER 31, 2020 SWO13-09 NIA NO QUALIFYING FLOW FOR OCTOBER 1, 2020 - DECEMBER 31, 2020 SWO13-10 N/A NO QUALIFYING FLOW FOR THE MONTH OF DECEMBER 2020 SWO13-11 N/A NO QUALIFYING FLOW FOR OCTOBER 1, 2020 - DECEMBER 31, 2020 SWO13-12 N/A NO QUALIFYING FLOW FOR OCTOBER 1, 2020 - DECEMBER 31, 2020 SWO13-13 N/A NO QUALIFYING FLOW FOR THE MONTH OF DECEMBER 2020 SWO13-14 N/A NO QUALIFYING FLOW FOR OCTOBER 1, 2020 - DECEMBER 31, 2020 SWO13-15 N/A NO QUALIFYING FLOW FOR OCTOBER 1, 2020 - DECEMBER 31, 2020 SWO15 12/14/20 <0.001 0.00115 0.00109 <0.001 <0.001 <0.001 <0.0002 <0.005 SWO16 12/14/20 0.00133 0.00181 <0.001 <0.001 <0.001 <0.001 <0.0002 0.070 SWO18 12/14/20 <0.001 0.00156 <0.001 <0.001 <0.001 <0.001 <0.0002 <0.005 SW020 12/14/20 10.0451 0.288 0.0520 10.020 <0.001 <0.001 0.000651 0.395 Permit Number NCS000546 Form SWU-247, last revised 611212015 Page 2 of 4 Outfall No. Date Sample Collected 71900 CO530 00556 Mercury, Total, Method 1631E Solids, Total Suspended — Concentration Oil & Grease mo/dd/yr ng/L mg/L m SW001 N/A NO QUALIFYING FLOW FOR THE MONTH OF DECEMBER 2020 SWO01A N/A NO QUALIFYING FLOW FOR OCTOBER 1, 2020 — DECEMBER 31, 2020 SW002 12/14/20 2.65 14.7 SW003 N/A NO QUALIFYING FLOW FOR OCTOBER 1, 2020 — DECEMBER 31, 2020 SW005 N/A NO QUALIFYING FLOW FOR OCTOBER 1, 2020 — DECEMBER 31, 2020 SW007 12/14/20 1.34 15 SW008 12/14/20 2.83 6.6 SWO09 12/14/20 3.01 10 SWO10 12/14/20 6.24 143 SW013-07 N/A NO QUALIFYING FLOW FOR OCTOBER 1, 2020 — DECEMBER 31, 2020 SWO13-08 N/A NO QUALIFYING FLOW FOR OCTOBER 1, 2020 — DECEMBER 31, 2020 SW013-09 N/A NO QUALIFYING FLOW FOR OCTOBER 1, 2020 — DECEMBER 31, 2020 SW013-10 N/A NO QUALIFYING FLOW FOR THE MONTH OF DECEMBER 2020 SW013-11 N/A NO QUALIFYING FLOW FOR OCTOBER 1, 2020 — DECEMBER 31, 2020 SW013-12 N/A NO QUALIFYING FLOW FOR OCTOBER 1, 2020 — DECEMBER 31, 2020 SWO13-13 N/A NO QUALIFYING FLOW FOR THE MONTH OF DECEMBER 2020 SW013-14 N/A NO QUALIFYING FLOW FOR OCTOBER 1, 2020 — DECEMBER 31, 2020 SWO13-15 N/A NO QUALIFYING FLOW FOR OCTOBER 1, 2020 — DECEMBER 31, 2020 SWO15 12/14/20 2.75 5.4 SWO16 12/14/20 3.56 35 SWO18 12/14/20 2.74 15 <5 SWO20 12/14/20 13.6 Avg 2200 Avg — Average of primary and duplicate mercury samples for SW020 (13.8 ng/L and 13.4 ng/L = 13.6 ng/L). Benchmark exceedances include Zinc at SW007 and SW020; Copper at SWO10 and SW020; TSS at SW020. Note: The Hg result for outfall SW020 was 13.6 ng/L (average). This Hg value is above the 12 ng/L North Carolina water quality standard for mercury and is noted on this DMR but does not trigger a Tier response. Permit Number NCS000546 Form SWU-247, last revised 611212015 Page 3 of 4 Does this facility perform Vehicle Maintenance Activities using more than 55 gallons of new motor oil per month? O yes @ no (if yes, complete Part B) Part B: Vehicle Maintenance Activity MonitoringRe uirements 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/l mg/l unit gal/mo STORM EVENT CHARACTERISTICS: Date 12/14/20 Total Event Precipitation (inches): 0.43 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 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." Wl i (Signature of Permittee) ( te) Permit Number NCS000546 Form SWU-247, last revised 611212015 Page 4 of 4