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NCS000546_Monitoring Report_20210908DUKE ' ENERGY Allen Steam Station 253 Plant Allen Rd. Belmont, NC 28012 704 829-2587 September 2, 2021 RECEIVE NCDEQ, Mooresville Regional Office Attn: DEMLR Stormwater Program Sp "8 7021 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 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 August 31, 2021. Samples were collected for the period at ouffalls SW016 and SW018 on August 3, 2021. The laboratory analysis results were received on August 17, 2021. Duke Energy has performed the steps required by the Tier II and Tier III for these outfalls. There were no samples collected at ouffalls SW001, SW007, SW009, SW010, SW013-10, SW013- 13 and SW020 for the period, due to No Qualifying Flow condition. There were samples collected at outfall SW015 on August 3, 2021 and the results are included in this DMR. 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, Jeffrey D. Flandgan, General Manager Allen Steam Station Duke Energy Carolinas, LLC Attachments bc: w/attachment Elizabeth Glenn UPS Tracking: 1Z X67 601 42 9624 3000 STORMWATER DISCHARGE OUTFALL (SDO) MONITORING REPORT Permit Number NCS000546 SAMPLES, COLLECTED DURING CALENDAR YEAR: 2021 (Vs monitoring report shall be received by the Division no later than 30 days from th-gdate the facility receives the sampling results from the laboratory.) FACILITY NAME Allen Steam Station PERSON COLLECTING SAMPLE(S) Joshua Sexton - Cardno o CERTIFIED LABORATORY(S) Duke Energy Carolinas, LC Lab # 248 f (l Pace Analytical Services Lab #329 Part A: Specific Monitoring Requirements COUNTY Gaston PHONE NO. 7( 04 ) 860-4945 SIGNATURE OF PERMITTEE OR DESIGNEE REQUIRED ON PAGE 3. Outfall No. Date Sample Collected 50050 00400 01077 01002 01022 01012 01027 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 mglL m mgtL m m SW001 N/A N/A NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021 SWO07 N/A N/A NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021 SW009 N/A N/A NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021 SWO10 N/A I N/A NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021 SW013-10 N/A N/A NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021 SW013-13 N/A N/A NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021 SWO15 813/21 N/A 0.16 17.5 1 <0.0003 1<0.001 10.751 <0.001 <0.001 SW016 8/3/21 N/A 0.16 18.1 1 <0.0003 1 <0.001 1 <0.05 <0.001 I <0.001 SW018 8/3/21 N/A 0.16 17.9 1 <0.0003 <0.001 1 <0.05 <0.001 <0.001 SW020 N/A N/A NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021 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 Ph) Antimony, Total (as Sb) Selenium, Total (as Se) Thallium, (Total as TI) Zinc, Total (as Zn) mo/dd/yr mg/L mg/L mg1L m mgfL mglL mglL m gtL SW001 N/A NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021 SW007 N/A NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021 SW009 N/A I NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021 SW010 N/A NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021 SW013-10 N/A NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021 SW013-13 N/A NO UALIFYING FLOW FOR THE MONTH OF AUGUST 2021 SW015 8/3/21 <0A01 <0.002 <0.001 I <0.001 <0.001 <0.001 <0.0002 <0.005 SWO16 8/3/21 <0.001 <0.002 1 <0.001 <0.001 <0.001 <0.001 1 <0.0002 10.013 Permit Number NCS000546 Form SWU-247, last revised 611212015 Page I of 3 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 mqJL m m m m SW018 8/3/21 <0.001 <0.002 <0.001 <0.001 <0.001 <0.001 <0.0002 <0.005 SW020 N/A N/A NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021 Outfall No. Date Sample Collected 71900 CO530 00556 Mercury, Total, Method 1631E Solids, Total Suspended — Concentration Oil & Grease mo/dd/yr ng/L I mg/L m SW001 N/A NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021 SW007 N/A NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021 SW009 N/A NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021 SWO10 N/A NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021 SW013-10 N/A NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021 SW013-13 N/A NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021 SW015 8/3/21 2.74 <2.5 SW016 8/3/21 0.555 <2.5 SW018 8/3/21 1.59 Avg 4.3 <5.0 SW020 N/A NO QUALIFYING FLOW FOR THE MONTH OF AUGUST 2021 Avg — Average of primary and duplicate mercury samples for SW018 (1.61 ng/L and 1.57 ng/L = 1.59 ng/L). Does this facility perform Vehicle Maintenance Activities using more than 55 gallons of new motor oil per month? O yes Q no (if yes, complete Part B) Part B: Vehicle Maintenance Activitv Monitoring Reauirements Outfall Date 50050 00556 00530 00400 No. Sample Total Flow Total Oil & Grease Non -polar Total pH New Motor Collected (if applicable) Rainfall (if appl.) O&G/TPH Suspended Oil Usage (Method 1664 Solids SGT-HEM), if appl. mo/dd/yr MG inches mg/l mg/1 unit gal/mo Permit Number NCS000546 Form SWU-247, last revised 611212015 Page 2of3 STORM EVENT CHARACTERISTICS: Date 8/3/21 Total Event Precipitation (inches): 0.16 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." Permit Number NCS000546 Form SWU-247, last revised 611212015 Page 3 of 3