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NCS000546_Monitoring Report_20210813/• DUKE V ENERGY August 12, 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 AUG 13182, 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 July 31, 2021. Samples were collected for the period at outfalls SW007, SW009, SW010, SW016, and SW018 on July 8, 2021. The laboratory analysis results were received on July 21, 2021. Duke Energy has performed the steps required by the Tier II and Tier III for these outfalls. There were no samples collected at outfalls SW001, SW013-10, SW013-13 and SW020 for the period, due to No Qualifying Flow condition. There were samples collected at outfall SW008 on July 8, 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, ; A/ --tom Jeffrey D. Flariagan, General Manager III Allen Steam Station Duke Energy Carolinas, LLC Attachments bc: w/attachment Elizabeth Glenn UPS Tracking: 1 Z X67 601 42 9422 9093 STORMWATER DISCHARGE OUTFALL (SDO) MONITORING REPORT Permit Number NCS000546 FACILITY NAME Allen Steam Station PERSON COLLECTING SAMPLE(S) Steve Hamilton/Shelby Dyer - Cardmi CERTIFIED LABORATORY(S) Duke Energy Carolinas, LC Lab # 248 Pace Analvtical Services Lab #329 Part A: Specific Monitoring Requirements SAMPLES COLLECTED DURING CALENDAR YEAR: 2021 (This menttoring report shall be received by the Division no later than 30 days from rCdatef 'e facility receives the sampling results from the laboratory.) 7 n (� COUNTY Gaston PHONE NO.( 704 ) 829-2587 rn SIGNATURE OF PERMITTEE OR DESIGNEE REQUIRED ON PAGE 3. Outl'all 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 m m m mgfL m SW001 N/A N/A NO QUALIFYING FLOW FOR THE MONTH OF JULY 2021 SW007 7/8/21 N/A 0.31 8.3 1 <0.0003 0.00119 <0.05 <0.001 <U.001 SW008 7/8/21 N/A 0.31 8.1 <0.0003 <0.001 <0.05 <0.001 <0.001 SW009 7/8/21 N/A 0.31 8.4 <0.0003 0.00192 <0.05 <0.001 <0.001 SWO10 7/8/21 N/A 0.31 8.2 <0.0003 0.00327 <0.05 <0.001 <0.001 SW013-10 N/A N/A NO QUALIFYING FLOW FOR THE MONTH OF JULY 2021 SW013-13 N/A N/A NO UALIFYING FLOW FOR THE MONTH OF JULY 2021 SW016 7/8/21 N/A 0.31 8.2 <0.00U3 <0.001 <0.05 <0.001 <0.001 SW018 7/8/21 N/A 0.31 8.3 <0.0003 11001 1 <0.05 1 <0.001 <0.001 SW020 N/A N/A NO QUALIFYING FLOW FOR THE MONTH OF JULY 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 mg1L m mFJL m SW001 N/A NO QUALIFYING FLOW FOR THE MONTH OF JULY 2021 SW007 7/8/21 <0.001 <0.002 <0.001 <0.001 <0.001 <0.001 <0.0002 0.122 SWO08 7/8/21 <0.001 0.00504 <0.001 <0.001 <0.001 0.00293 <0.0002 U.019 SW009 7/8/21 <0.001 0.00255 <0.001 <0.001 <0.001 0.0109 <0.0002 10.050 SWO10 7/8/21 <0.001 0.00823 0.00155 <0.001 <0.001 0.00649 <0.0002 10.032 SWO13-10 N/A NO QUALIFYING FLOW FOR THE MONTH OF JULY 2021 SW013-13 N/A NO QUALIFYING FLOW FOR THE MONTH OF JULY 2021 SW016 7/8/21 <0.001 1 <0.002 <0.001 I <0.001 <0.001 I <0.001 <0.0002 10.052 Permit Number NCS000546 Form SWU-247, last revised 61122015 Page 1 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 m m m m m SWO18 7/8/21 <0.001 <0.002 <0.001 <0.001 <0.001 <0.001 1 <0.0002 <0.005 SW020 N/A NO QUALIFYING FLOW FOR THE MONTH OF JULY 2021 Outfall No. Date Sample Collected 71900 C0530 00556 Mercury, Total, Method 1631E Solids, Total Suspended — Concentration Oil & Grease mo/dd/yr ng/L I mg/L m SWO01 N/A NO QUALIFYING FLOW FOR THE MONTH OF JULY 2021 SWO07 7/8/21 1.14 3.1 SWO08 7/8/21 2.10 <2.5 SWO09 7/8/21 1.06 6.9 SW010 7/8/21 2.76 1 <2.5 SWO13-10 N/A NO QUALIFYING FLOW FOR THE MONTH OF JULY 2021 SWO13-13 N/A NO QUALIFYING FLOW FOR THE MONTH OF JULY 2021 SWO16 7/8/21 0.842 3.2 SWO18 7/8/21 2.35 Avg 146.9 1 <5.0 SW020 I N/A NO QUALIFYING FLOW FOR THE MONTH OF JULY 2021 Avg — Average of primary and duplicate mercury samples for SW016 (2.13 ng/L and 2.56 ng/L = 2.35 ng/L. Does this facility perform Vehicle Maintenance Activities using more than 55 gallons of new motor oil per month? © yes (�) no (if yes, complete Part B) Part B: Vehicle Maintenance Activitv Monitoring Renuirements 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 Permit Number NCS000546 Form SWU-247, last revised 611212015 Page 2 of 3 STORM EVENT CHARACTERISTICS: Date 7/8/21 Total Event Precipitation (inches): 0.31 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 il' 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." (Signature of Permittee) i i Permit Number NCS000546 F-//Zf'2o2 (Date) Form SWU-247, Iasi revised 611212015 Page 3 of 3