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NCS000546_Tier III Action Plan with Email_20221115Georgoulias, Bethany From: Glenn, Elizabeth <Elizabeth.Glenn@duke-energy.com> Sent: Tuesday, November 15, 2022 9:34 AM To: Khan, Zahid Cc: Georgoulias, Bethany Subject: [External] Allen Steam Station NCS000546 - Tier III Action Plan Attachments: AIIenISWActionPlan016010 111422 - T3.pdf CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to Report Spam. Mr. Khan — Please accept the attached Action Plan for the subject station. Let us know if you have any questions. Thank you, J. Elizabeth Glenn Permitting & Compliance Duke Energy, Environmental Services Office: (980) 373 0530 1 4 DUKE ENERGY November 14, 2022 NC Department of Environmental Quality Division of Energy, Mineral, and Land Resource 610 East Center Avenue, Suite 301 Mooresville, NC 28115 Subject: Action Plan: Tier III Exceedances for SW 010 & 016 Allen Steam Station Permit No: NCS000546 Gaston County Dear Mr. Khan: Allen Steam Station 253 Plant Allen Road Belmont, NC 28012 Duke Energy respectfully submits the Action Plan, required as by Part D, Section D-7 of the subject permit. Should you have any questions regarding this submittal or require additional information, please contact Elizabeth Glenn at (980) 373-0530 or email Elizabeth.Glenn@duke-energy.com. 1 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. 1 am aware that there are significant penalties for submitting false information, including the possibility of fines and imprisonment for knowing violations. Sinc ely, Jeffre D. FI agan General Manager III Allen Steam Station Enclosures (.-� Cardna� Contact Information Cardno now Stantec 534 Industrial Park Road, Bluefield, VA 24605 Telephone: 304.952.1324 www.cardno.com Action Plan Allen Steam Station: Belmont, NC Prepared for: Duke Enerav Document Information �� DUKE Prepared for ENERGY® Randy Gantt Duke Energy 253 Plant Allen Road, Belmont, NC Project Name Allen Steam Station Action Plan: Tier III Benchmark Exceedances Author(s) Joshua Sexton Senior Geologist for Cardno now Job Reference 238000559 Stantec Date November 2022 © Cardno. Copyright in the whole and every part of this document belongs to Cardno and may not be used, sold, transferred, copied or reproduced in whole or in part in any manner or form or in or on any media to any person other than by agreement with Cardno. This document is produced by Cardno solely for the benefit and use by the client in accordance with the terms of the engagement. Cardno does not and shall not assume any responsibility or liability whatsoever to any third party arising out of any use or reliance by any third party on the content of this document. November 2022 Cardno now Stantec Action Plan Action Plan: Tier III Benchmark Exceedances Allen Steam Station — Belmont, NC Prepared for: Duke Enerov Table of Contents 1 Exceedance Documentation............................................................................................................ 1 1.1 SW010................................................................................................................................. 1 1.2 SWO16................................................................................................................................. 1 2 Inspection Report..............................................................................................................................2 3 Review................................................................................................................................................ 2 3.1 SW010.................................................................................................................................2 3.2 SWO16.................................................................................................................................2 4 Action Plan.........................................................................................................................................3 4.1 SW010................................................................................................................................. 3 4.2 SWO16................................................................................................................................. 3 5 Monitoring Plan................................................................................................................................. 3 5.1 SW010................................................................................................................................. 3 5.2 SWO16................................................................................................................................. 3 Tables Table 1 — Historical Analytical Results - Outfall SWO10 Table 2 — Historical Analytical Results - Outfall SWO16 Appendices Appendix A — Analytical Laboratory Reports Appendix B — Inspection Report Appendix C — Best Management Practices November 2022 Cardno now Stantec ii Tier III Action Plan 11-2022 DRAFT Action Plan: Tier III Benchmark Exceedances Allen Steam Station - Belmont, NC Prepared for: Duke Enerav 1 Exceedance Documentation 1.1 SW010 Outfall SW010 exceeded the benchmark standard for copper for the September 30, 2022 stormwater sample collection. Laboratory results from this sampling event were received on October 17, 2022 and are included as Appendix A. SW010 entered into Tier III status for copper on November 2, 2018. Most recent benchmark exceedances for SW010 are included below. Historical analytical results are presented as Table 1 in the Appendix. SW010 Cu (mg/L) I Date Value Benchmark September 21, 2021 0.0123 0.0100 February 23, 2022 0.0171 0.0100 March 16, 2022 0.0244 0.0100 September 30, 2022 0.0115 0.0100 1.2 SWO16 Outfall SWO16 exceeded the benchmark standard for copper and total suspended solids (TSS) for the September 30, 2022 stormwater sample collection. Laboratory results from this sampling event were received on October 17, 2022 and are included as Appendix A. SWO16 entered into Tier III status for copper on November 2, 2018 and TSS on November 12, 2019. Most recent benchmark exceedances for SWO16 are included below. Historical analytical results are presented as Table 2 in the Appendix. SWO16 I Cu (mg/L) TSS (mg/L) Date Value Benchmark Value Benchmark November 11, 2020 0.0153 0.0100 140 100 February 23, 2022 10.0346 0.0100 600 100 � March 16, 2022 10.0200 0.0100 j 310 J 100 September 30, 2022 0.0179 0.0100 270 100 November 2022 Cardno now Stantec 1 Tier III Action Plan 11-2022 DRAFT Action Plan: Tier III Benchmark Exceedances Allen Steam Station - Belmont, NC Prepared for: Duke Enerav 2 Inspection Report Cardno and Duke staff conducted a thorough inspection of SW010 and SW016 drainage basins on October 27, 2022. This report is included as Attachment B. 3 Review 3.1 SW010 The drainage area for SW010 is comprised of a paved alley next to the powerhouse, rail lines immediately east of the powerhouse, a gravel drive downgradient of the rail line and a grassed embankment located between the rail lines and the intake structure. The area contains approximately 1,280 linear feet of rail lines. Train cars carrying coal and limestone use the rail lines that pass through this drainage basin. Duke Energy enforces procedures to minimize tracking of fugitive coal dust. Vehicular and equipment traffic is also present in the drainage basin. All mobile equipment operating on the plant site is inspected to ensure overall integrity of the body and any containers present. Best Management Practices (BMPs) details are outlined in Appendix C, Best Management Practices. Prior to the October 27, 2022 site visit, drop inlets in the paved alley immediately adjacent to the powerhouse were not known to connect to the SWO10 conveyance piping. Tracking of coal and potential combustion material is occurring in the alley. It is believed that these drop inlets may be the source of benchmark exceedances. A sediment sample from one of the drop -inlets has been collected to confirm. Analytical results are pending. 3.2 SWO16 The drainage area for SW016 encompasses primarily vegetated upland areas along the site access road south of the discharge canal. The drainage area includes approximately 1,700 linear feet of the paved access road, and approximately 1,000 linear feet of the paved road utilized to haul ash. Haul trucks use the road to transport ash from the dry ash handling facility to the ash landfill. The drainage area also includes 700 linear feet of paved road south of the access road, approximately 1,000 linear feet of dirt roads north of the access road, and a gravel -surfaced laydown and equipment parking area north of the access road. Ash and soil are transported through this drainage basin. Duke Energy enforces procedures to minimize tracking of fugitive dust. Inspection of hauling vehicles for covers, tailgate seals and overall integrity is required. Materials storage areas are also required to be covered with water resistant materials. BMP details are outlined in Appendix C. During the October 27, 2022 inspection, it was noted that haulage and construction activities were not following BMP practices. Sediment from truck traffic and construction activities was present in the stormwater conveyance system. Crossings were not being actively maintained and sediment was not being removed from conveyance ditches or roadways. Additionally, denuded ground from construction activity was not stabilized and erosion and control structures were not properly installed. November 2022 Cardno now Stantec Tier III Action Plan 11-2022 DRAFT Action Plan: Tier III Benchmark Exceedances Allen Steam Station - Belmont, NC Prepared for: Duke Enerav 4 Action Plan 4.1 SW010 Sediment and stormwater samples should be collected and analyzed from alley drop inlets to determine if elevated metals constituents are present. If this is the case a smoke test should be conducted to determine all drop inlets connected to the stormwater system west of the rail lines. Identified drop inlets will then be either sealed or diverted to the coal yard sump. Existing subsurface stormwater piping should then be jetted to clear metals enriched sediment buildup from the conveyance structure. Jetted material should be evacuated from a downstream drop inlet and not allowed to discharge from the outfall. 4.2 SWO16 Sediment removal from conveyance ditches along Plant Allen Road should be undertaken. Crossings need to be adequately maintained with crushed stone to limit sediment tracking across Plant Allen Road. Sediment needs to be consistently removed from the crossing when fouling occurs and immediately before precipitation events. Construction areas need proper erosion and sediment controls installed immediately. Stabilization of denuded ground should then be conducted to limit future sediment impacts to stormwater. 5 Monitoring Plan 5.1 SW010 Following determination of enriched copper inputs and mitigation efforts, stormwater samples should be collected monthly as required under Tier III status to monitor impacts (if any) to stormwater discharge. 5.2 SWO16 Implementation of BMPs noted in the action plan should limit sediment input to the basin. Onsite staff should perform checks weekly and before precipitation events to confirm BMPs are adequately being implemented. Stormwater samples should be collected monthly to confirm benchmarks are not exceeded. November 2022 Cardno now Stantec Tier III Action Plan 11-2022 DRAFT Action Plan: Tier III Benchmark Exceedances Belmont, NC Table 1 Historical Analytical Results - Outfall SW010 24"CMP to Catawba River (Lake Wylie) - Draining RR. WOW 8/19/2015 0.52 6.8 38 0.011 Tier I (Cu) 11/30/15 1.79 6.6 36 0.0076 12/20/2017 0.4 7.0 220 0.02720 4/23/2018 1.96 7.6 99 1 0.0180 Tier 11 (Cu), begin monthly 10/10/2018 0.80 8.3 6.2 0.00543 11/2/2018 0.53 7.9 410 12/20/2018 1.49 8.0 700 6/7/2019 1.06 8.3 8.2 11/12/2019 0.59 8.0 1/24/2020 3/3/2020 0.91 0.83 6.1 6.9 5/27/2020 1.46 6.3 i 6/16/2020 0.51 6.1 8/21/2020 9/17/2020 11/11/2020 0.43 1.86 0.46 6.8 7.2 8.1 • . 12/14/2020 0.43 7.2 i 1/25/2021 2/11/2021 0.31 0.46 7.5 7.4 • : • 3/16/2021 1.07 8.0 i 5/3/2021 7/8/2021 0.56 0.31 7.9 8.2 • Moll 8/2021 No Flow 9/21/2021 0.36 7.2 01/2022 No Flow 2/23/2022 0.43 8.0 3/16/2022 1.05 8.4 04-08/2022 No Flow 9/30/2022 2.12 6.7 1 0 1 4,7MlI 1st Tier III under permit renewal SU - standard units Tier I mg/L - milligrams per liter Tier ug/L - micrograms per liter ng/L - nanograms per liter Table 2 Historical Analytical Results - Outfall SWO16 36"CMP to discharge canal to South Fork Catawba River - Draining paved/gravel/dirt roads, and ash haul road. 1/15/16 1.15 8.2 360 0.02140 Tier I (TSS, Cu) 5/17/16 0.77 7.0 240 0.01480 Tier II (TSS, Cu) begin monthly 6/15/2016 0.43 7.9 230 0.0163 7/21/2016 0.24 7.0 48 0.00768 9/1/2016 1.25 8.1 100 0.00705 4/3/2017 0.36 Not Accessible 12/20/2017 0.4 7.4 Tier III (TSS, Cu) 3/6/2018 0.51 8.9 10/10/2018 0.80 1 0.53 7.9 7.0 :. .: 0 oil 1 I M • 11/2/2018 12/20/2018 4/2/2019 1 1.49 0.11 5.9 7.6 6/7/2019 1.06 7.3 11/12/2019 1/24/2020 0.59 0.91 7.5 6.9 0 Is Is IS 3/3/2020 1 0.83 7.1 M • l 5/27/2020 1.46 6.7 of 6/16/2020 0.51 7.6 of 8/21/2020 0.43 7.0 Is 9/17/2020 11/11/2020 1.86 0.46 7.5 7.9 1 9 12/14/2020 0.43 7.3 1/25/2021 2/11/2021 0.31 0.46 7.6 7.6 3/16/2021 5/3/2021 1.07 0.56 8.2 6.3 7/8/2021 0.31 8.2 8/3/2021 9-12/2021 0.16 1 8.1 No Flow 01/2022 No Flow 2/23/2022 0.43 8.4 1i 3/16/2022 1.05 8.0 04-08/2022 No Flow 9/30/2022 2.12 7.0 1 1 PUA 11st Tier III under permit renewal SU - standard units Tier I mg/L - milligrams per liter Tier 11 ug/L - micrograms per liter Tier III ng/L - nanograms per liter Action Plan: Tier III Benchmark Exceedances Belmont, NC i: DUKE Analytical Laboratory ENERGY 13339 Hagers Ferry Road Huntersville, NC 28078-7929 McGuire Nuclear Complex - MG03A2 Phone:980-875-5245 Fax:980-875-4349 Order Summary Report Order Number: J22100047 Project Name: ALLEN - NPDES STORMWATER EquisTaskCode: Customer Name(s): Robert Wylie, Randy Gantt, Chuck Cline, Sally Suddreth, Robbin Jolly, George R Customer Address: Allen Steam Station 253 Plant Allen Road Belmont, NC 28012 Lab Contact: Jason Robinson Phone: 980-875-5266 Report Authorized By: 9'_/�Date: 10/17/2022 (Signature) - J on Robinson Program Comments: Please contact the Program Manager (Jason Robinson) with any questions regarding this report. Data Flags & Calculations: 1 of 55 Any analytical tests or individual analytes within a test flagged with a Qualifier indicate a deviation from the method quality system or quality control requirement. The qualifier description is found at the end of the Certificate of Analysis (sample results) under the qualifiers heading. All results are reported on a dry weight basis unless otherwise noted. Subcontracted data included on the Duke Certificate of Analysis is to be used as information only. Certified vendor results can be found in the subcontracted lab final report. Duke Energy Analytical Laboratory subcontracts analyses to other vendor laboratories that have been qualified by Duke Energy to perform these analyses except where noted. Data Package: This data package includes analytical results that are applicable only to the samples described in this narrative. An estimation of the uncertainty of measurement for the results in the report is available upon request. This report shall not be reproduced, except in full, without the written consent of the Analytical Laboratory. Please contact the Analytical laboratory with any questions. The order of individual sections within this report is as follows: Job Summary Report, Sample Identification, Technical Validation of Data Package, Analytical Laboratory Certificate of Analysis, Analytical Laboratory QC Reports, Sub -contracted Laboratory Results, Customer Specific Data Sheets, Reports & Documentation, Customer Database Entries, Test Case Narratives, Chain of Custody (COC) Certification: The Analytical Laboratory holds the following State Certifications : North Carolina (DENR) Certificate #248, South Carolina (DHEC) Laboratory ID # 99005. Contact the Analytical Laboratory for definitive information about the certification status of specific methods. Sample ID's & Descriptions: 2 of 55 Sample ID Plant/Station 2022025935 2022025936 2022025937 2022025938 2022025939 2022025940 2022025941 7 Total Samples Collection Date and Time Collected By Sample Description ALLEN 30-Sep-22 11:10 AM Josh Sexton SWO08 ALLEN 30-Sep-22 10:00 AM Josh Sexton SW010 ALLEN 30-Sep-22 10:25 AM Josh Sexton SWO15 ALLEN 30-Sep-22 11:45 AM Josh Sexton SWO16 ALLEN 30-Sep-22 10:25 AM Josh Sexton Hg Dup ALLEN 30-Sep-22 10:45 AM Josh Sexton HG Field Blank ALLEN 30-Sep-22 10:50 AM Josh Sexton Hg Trip Blank 3 of 55 Technical Validation Review Checklist: COC and .pdf report are in agreement with sample totals❑ Yes ❑ No and analyses (compliance programs and procedures). All Results are less than the laboratory reporting limits. ❑ Yes 0 No All laboratory QA/QC requirements are acceptable. 0 Yes ❑ No Report Sections Included: Job Summary Report 0 Sample Identification 0 Technical Validation of Data Package 0 Analytical Laboratory Certificate of Analysis ❑ Analytical Laboratory QC Report 0 Sub -contracted Laboratory Results ❑ Customer Specific Data Sheets, Reports, & Documentation ❑ Customer Database Entries ❑ Chain of Custody ❑ Electronic Data Deliverable (EDD) Sent Separately Reviewed By: Jason Robinson Date: 10/17/2022 Certificate of Laboratory Analysis This report shall not be reproduced, except in full. Order # J22100047 Site: SWO08 Collection Date: 09/30/2022 11:10 AM Sample #: 2022025935 Matrix: NPDES Analyse Result Units Qualifiers RDL DF Method OIL AND GREASE IN WATER - SOLID PHASE EXTRACTION - (Analvsis Performed by Pace Laboratories Vendor Parameter Complete Vendor Method MERCURY IN WATER - (Analysis Performed by Pace Labs) Vendor Parameter Complete Vendor Method TOTAL RECOVERABLE METALS BY ICP - Q22100037 Boron (B) 0.072 mg/L 0.05 1 EPA 200.7 Calcium (Ca) 26.4 mg/L 0.05 1 EPA 200.7 Magnesium (Mg) 2.06 mg/L 0.02 1 EPA 200.7 Total Hardness (Ca and Mg) 74.5 mg/L 0.05 1 EPA 200.7 (CaCO3) Zinc (Zn) 0.021 mg/L 0.005 1 EPA 200.7 TOTAL RECOVERABLE METALS BY ICP-MS - 022100040 Antimony (Sb) < 1 ug/L 1 1 EPA 200.8 Arsenic (As) 1.09 ug/L 1 1 EPA 200.8 Beryllium (Be) < 1 ug/L 1 1 EPA 200.8 Cadmium (Cd) < 1 ug/L 1 1 EPA 200.8 Chromium (Cr) < 1 ug/L 1 1 EPA 200.8 Copper (Cu) 6.13 ug/L 2 1 EPA 200.8 Lead (Pb) < 1 ug/L 1 1 EPA 200.8 Nickel (Ni) 1.01 ug/L 1 1 EPA 200.8 Selenium (Se) 3.18 ug/L 1 1 EPA 200.8 Silver (Ag) Low Level < 0.3 ug/L 0.3 1 EPA 200.8 Thallium (TI) Low Level < 0.2 ug/L 0.2 1 EPA 200.8 Total Suspended Solids - Low RL 2.5 - 022100024 TSS 9.0 mg/L 2.5 1 SM2540D 4 of 55 Analysis Date/Time Analyst V_PACE V_SHEALY 10/06/202212:44 CELL106 10/06/202212:44 CELL106 10/06/202212:44 CELL106 10/06/202212:44 CELL106 10/06/202212:44 CELL106 10/06/202213:18 MHALL3 10/06/202213:18 MHALL3 10/06/202213:18 MHALL3 10/06/202213:18 MHALL3 10/06/202213:18 MHALL3 10/06/202213:18 MHALL3 10/06/202213:18 MHALL3 10/06/202213:18 MHALL3 10/06/202213:18 MHALL3 10/06/202213:18 MHALL3 10/06/202213:18 MHALL3 10/04/2022 07:47 EBATIAN Certificate of Laboratory Analysis This report shall not be reproduced, except in full. Order # J22100047 Site: SWO10 Collection Date: 09/30/2022 10:00 AM Sample #: 2022025936 Matrix: NPDES Analyse Result Units Qualifiers RDL DF Method OIL AND GREASE IN WATER - SOLID PHASE EXTRACTION - (Analvsis Performed by Pace Laboratories Vendor Parameter Complete Vendor Method MERCURY IN WATER - (Analysis Performed by Pace Labs) Vendor Parameter Complete Vendor Method TOTAL RECOVERABLE METALS BY ICP - Q22100037 Boron (B) < 0.05 mg/L 0.05 1 EPA 200.7 Calcium (Ca) 23.5 mg/L 0.05 1 EPA 200.7 Magnesium (Mg) 1.94 mg/L 0.02 1 EPA 200.7 Total Hardness (Ca and Mg) 66.7 mg/L 0.05 1 EPA 200.7 (CaCO3) Zinc (Zn) 0.032 mg/L 0.005 1 EPA 200.7 TOTAL RECOVERABLE METALS BY ICP-MS - 022100040 Antimony (Sb) < 1 ug/L 1 1 EPA 200.8 Arsenic (As) 3.23 ug/L 1 1 EPA 200.8 Beryllium (Be) < 1 ug/L 1 1 EPA 200.8 Cadmium (Cd) < 1 ug/L 1 1 EPA 200.8 Chromium (Cr) < 1 ug/L 1 1 EPA 200.8 Copper (Cu) 11.5 ug/L 2 1 EPA 200.8 Lead (Pb) < 1 ug/L 1 1 EPA 200.8 Nickel (Ni) 1.69 ug/L 1 1 EPA 200.8 Selenium (Se) 8.73 ug/L 1 1 EPA 200.8 Silver (Ag) Low Level < 0.3 ug/L 0.3 1 EPA 200.8 Thallium (TI) Low Level < 0.2 ug/L 0.2 1 EPA 200.8 Total Suspended Solids - Low RL 2.5 - 022100024 TSS 12 mg/L 3.9 1 SM2540D 5 of 55 Analysis Date/Time Analyst V_PACE V_SHEALY 10/06/202212:49 CELL106 10/06/202212:49 CELL106 10/06/202212:49 CELL106 10/06/202212:49 CELL106 10/06/202212:49 CELL106 10/06/202213:27 MHALL3 10/06/202213:27 MHALL3 10/06/202213:27 MHALL3 10/06/202213:27 MHALL3 10/06/202213:27 MHALL3 10/06/202213:27 MHALL3 10/06/202213:27 MHALL3 10/06/202213:27 MHALL3 10/06/202213:27 MHALL3 10/06/202213:27 MHALL3 10/06/202213:27 MHALL3 10/04/2022 07:47 EBATIAN Certificate of Laboratory Analysis This report shall not be reproduced, except in full. Order # J22100047 Site: SWO15 Collection Date: 09/30/2022 10:25 AM Sample #: 2022025937 Matrix: NPDES Analyse Result Units Qualifiers RDL DF Method OIL AND GREASE IN WATER - SOLID PHASE EXTRACTION - (Analvsis Performed by Pace Laboratories Vendor Parameter Complete Vendor Method MERCURY IN WATER (AVERAGE) - Mercury Average 1.50 ng/L 0.5 1 Calculation MERCURY IN WATER - (Analysis Performed by Pace Labs) Vendor Parameter Complete Vendor Method TOTAL RECOVERABLE METALS BY ICP - 022100037 Boron (B) 0.732 mg/L 0.05 1 EPA 200.7 Calcium (Ca) 35.6 mg/L 0.05 1 EPA 200.7 Magnesium (Mg) 4.93 mg/L 0.02 1 EPA 200.7 Total Hardness (Ca and Mg) 109 mg/L 0.05 1 EPA 200.7 (CaCO3) Zinc (Zn) < 0.005 mg/L 0.005 1 EPA 200.7 TOTAL RECOVERABLE METALS BY ICP-MS 022100040 Antimony (Sb) < 1 ug/L 1 1 EPA 200.8 Arsenic (As) < 1 ug/L 1 1 EPA 200.8 Beryllium (Be) < 1 ug/L 1 1 EPA 200.8 Cadmium (Cd) < 1 ug/L 1 1 EPA 200.8 Chromium (Cr) < 1 ug/L 1 1 EPA 200.8 Copper (Cu) < 2 ug/L 2 1 EPA 200.8 Lead (Pb) < 1 ug/L 1 1 EPA 200.8 Nickel (Ni) < 1 ug/L 1 1 EPA 200.8 Selenium (Se) < 1 ug/L 1 1 EPA 200.8 Silver (Ag) Low Level < 0.3 ug/L 0.3 1 EPA 200.8 Thallium (TI) Low Level < 0.2 ug/L 0.2 1 EPA 200.8 Total Suspended Solids - Low RL 2.5 - Q22100024 TSS < 2.5 mg/L 2.5 1 SM2540D 6 of 55 Analysis Date/Time Analyst V_PACE V_SHEALY 10/06/202212:53 CELL106 10/06/202212:53 CELL106 10/06/202212:53 CELL106 10/06/202212:53 CELL106 10/06/202212:53 CELL106 10/06/202213:35 MHALL3 10/06/202213:35 MHALL3 10/06/202213:35 MHALL3 10/06/202213:35 MHALL3 10/06/202213:35 MHALL3 10/06/202213:35 MHALL3 10/06/202213:35 MHALL3 10/06/202213:35 MHALL3 10/06/202213:35 MHALL3 10/06/202213:35 MHALL3 10/06/202213:35 MHALL3 10/04/2022 07:47 EBATIAN Certificate of Laboratory Analysis This report shall not be reproduced, except in full. Order # J22100047 Site: SWO16 Collection Date: 09/30/2022 11:45 AM Sample #: 2022025938 Matrix: NPDES Analyse Result Units Qualifiers RDL DF Method OIL AND GREASE IN WATER - SOLID PHASE EXTRACTION - (Analvsis Performed by Pace Laboratories Vendor Parameter Complete Vendor Method MERCURY IN WATER - (Analysis Performed by Pace Labs) Vendor Parameter Complete Vendor Method TOTAL RECOVERABLE METALS BY ICP - Q22100037 Boron (B) < 0.05 mg/L 0.05 1 EPA 200.7 Calcium (Ca) 36.4 mg/L 0.05 1 EPA 200.7 Magnesium (Mg) 9.24 mg/L 0.02 1 EPA 200.7 Total Hardness (Ca and Mg) 129 mg/L 0.05 1 EPA 200.7 (CaCO3) Zinc (Zn) 0.073 mg/L 0.005 1 EPA 200.7 TOTAL RECOVERABLE METALS BY ICP-MS - 022100040 Antimony (Sb) < 1 ug/L 1 1 EPA 200.8 Arsenic (As) 5.59 ug/L 1 1 EPA 200.8 Beryllium (Be) < 1 ug/L 1 1 EPA 200.8 Cadmium (Cd) < 1 ug/L 1 1 EPA 200.8 Chromium (Cr) 9.37 ug/L 1 1 EPA 200.8 Copper (Cu) 17.9 ug/L 2 1 EPA 200.8 Lead (Pb) 4.45 ug/L 1 1 EPA 200.8 Nickel (Ni) 8.43 ug/L 1 1 EPA 200.8 Selenium (Se) 1.02 ug/L 1 1 EPA 200.8 Silver (Ag) Low Level < 0.3 ug/L 0.3 1 EPA 200.8 Thallium (TI) Low Level < 0.2 ug/L 0.2 1 EPA 200.8 Total Suspended Solids - Low RL 2.5 - 022100024 TSS 270 mg/L 50 1 SM2540D 7 of 55 Analysis Date/Time Analyst V_PACE V_SHEALY 10/06/202212:58 CELL106 10/06/202212:58 CELL106 10/06/202212:58 CELL106 10/06/202212:58 CELL106 10/06/202212:58 CELL106 10/06/202213:43 MHALL3 10/06/202213:43 MHALL3 10/06/202213:43 MHALL3 10/06/202213:43 MHALL3 10/06/202213:43 MHALL3 10/06/202213:43 MHALL3 10/06/202213:43 MHALL3 10/06/202213:43 MHALL3 10/06/202213:43 MHALL3 10/06/202213:43 MHALL3 10/06/202213:43 MHALL3 10/04/2022 07:47 EBATIAN Certificate of Laboratory Analysis This report shall not be reproduced, except in full. Order # J22100047 Site: Hg Dup Collection Date: 09/30/2022 10:25 AM Analyse Result Units Qualifiers RDL DF MERCURY IN WATER - (Analysis Performed by Pace Labs) Vendor Parameter Complete 8 of 55 Sample #: 2022025939 Matrix: NPDES Method Analysis Date/Time Analyst Vendor Method V_SHEALY Certificate of Laboratory Analysis This report shall not be reproduced, except in full. Order # J22100047 Site: HG Field Blank Collection Date: 09/30/2022 10:45 AM Analyse Result Units Qualifiers RDL DF MERCURY IN WATER - (Analysis Performed by Pace Labs) Vendor Parameter Complete 9 of 55 Sample #: 2022025940 Matrix: NPDES Method Analysis Date/Time Analyst Vendor Method V_SHEALY Certificate of Laboratory Analysis This report shall not be reproduced, except in full. Order # J22100047 Site: Hg Trip Blank Collection Date: 09/30/2022 10:50 AM Analyse Result Units Qualifiers RDL DF MERCURY IN WATER - (Analysis Performed by Pace Labs) Vendor Parameter Complete 10 of 55 Sample #: 2022025941 Matrix: NPDES Method Analysis Date/Time Analyst Vendor Method V_SHEALY Certificate of Laboratory Analysis 11 of 55 This report shall not be reproduced, except in full. Order # J22100047 Level II QC Summary Q22100037 ICP_TRM TOTAL RECOVERABLE METALS BY ICP Blank # 1 Parameter Measured Final Units: Dil RDL Relative Concentration Qualifier Boron (B) 0.00111 0.00111 mg/L 1 0.05 < 1/2 RDL Calcium (Ca) 0.000259 0.000259 mg/L 1 0.05 < 1/2 RDL Magnesium (Mg) -0.00109 -0.00109 mg/L 1 0.02 < 1/2 RDL Zinc (Zn) 0.000107 0.000107 mg/L 1 0.005 < 1/2 RDL LCS # 1 Parameter Measured Final Units: Dil Spike % Recovery LCL UCL Qualifier Boron (B) 4.89 4.89 mg/L 1 5 97.8 85 115 Calcium (Ca) 4.88 4.88 mg/L 1 5 97.6 85 115 Magnesium (Mg) 4.83 4.83 mg/L 1 5 96.5 85 115 Zinc (Zn) 4.91 4.91 mg/L 1 5 98.2 85 115 LCS # 2 Parameter Measured Final Units: Dil Spike % Recovery LCL UCL Qualifier Boron (B) 4.84 4.84 mg/L 1 5 96.8 85 115 Calcium (Ca) 4.84 4.84 mg/L 1 5 96.8 85 115 Magnesium (Mg) 4.77 4.77 mg/L 1 5 95.4 85 115 Zinc (Zn) 4.87 4.87 mg/L 1 5 97.4 85 115 LCS # 3 Parameter Measured Final Units: Dil Spike % Recovery LCL UCL Qualifier Boron (B) 4.78 4.78 mg/L 1 5 95.6 85 115 Calcium (Ca) 4.8 4.8 mg/L 1 5 96 85 115 Magnesium (Mg) 4.7 4.7 mg/L 1 5 94 85 115 Zinc (Zn) 4.82 4.82 mg/L 1 5 96.4 85 115 LCS # 4 Parameter Measured Final Units: Dil Spike % Recovery LCL UCL Qualifier Boron (B) 4.95 4.95 mg/L 1 5 98.9 85 115 Calcium (Ca) 4.97 4.97 mg/L 1 5 99.4 85 115 Magnesium (Mg) 4.92 4.92 mg/L 1 5 98.4 85 115 Zinc (Zn) 5 5 mg/L 1 5 99.9 85 115 LCS # 5 Parameter Measured Final Units: Dil Spike % Recovery LCL UCL Qualifier Boron (B) 4.84 4.84 mg/L 1 5 96.8 85 115 Calcium (Ca) 4.88 4.88 mg/L 1 5 97.5 85 115 Magnesium (Mg) 4.83 4.83 mg/L 1 5 96.5 85 115 Zinc (Zn) 4.92 4.92 mg/L 1 5 98.3 85 115 Certificate of Laboratory Analysis 12 of 55 This report shall not be reproduced, except in full. Order # J22100047 Level II QC Summary Q22100037 ICP_TRM TOTAL RECOVERABLE METALS BY ICP MS # 1 Parameter Measured Final Units: Dil Boron (B) 5.31 5.31 mg/L 1 Calcium (Ca) 42.7 42.7 mg/L 1 Magnesium (Mg) 19.5 19.5 mg/L 1 Zinc (Zn) 4.88 4.88 mg/L 1 MSD # 1 Parameter Measured Final Units: Dil Boron (B) 5.17 5.17 mg/L 1 Calcium (Ca) 41 41 mg/L 1 Magnesium (Mg) 18.7 18.7 mg/L 1 Zinc (Zn) 4.72 4.72 mg/L 1 Parent Sample: J22090121 -- 2022023504 Spike % Recovery LCL UCL Qualifier 5 99.1 70 130 5 107 70 130 5 101 70 130 5 97.2 70 130 Parent Sample: J22090121 -- 2022023504 Spike % Recovery LCL UCL RPD Qualifier 5 96.2 70 130 2.82 5 72.1 70 130 4.2 5 84.9 70 130 4.11 5 94 70 130 3.33 Certificate of Laboratory Analysis 13 of 55 This report shall not be reproduced, except in full. Order # J22100047 Level II QC Summary Q22100040 IMS_TRM TOTAL RECOVERABLE METALS BY ICP-MS Blank # 1 Parameter Measured Final Units: Dil RDL Relative Concentration Qualifier Antimony (Sb) 0.074 0.074 ug/L 1 1 < 1/2 RDL Arsenic (As) 0.017 0.017 ug/L 1 1 < 1/2 RDL Beryllium (Be) 0.016 0.016 ug/L 1 1 < 1/2 RDL Cadmium (Cd) -0.003 -0.003 ug/L 1 1 < 1/2 RDL Chromium (Cr) 0.041 0.041 ug/L 1 1 < 1/2 RDL Copper (Cu) 0.01 0.01 ug/L 1 2 < 1/2 RDL Lead (Pb) 0.008 0.008 ug/L 1 1 < 1/2 RDL Nickel (Ni) 0.03 0.03 ug/L 1 1 < 1/2 RDL Selenium (Se) -0.048 -0.048 ug/L 1 1 < 1/2 RDL Silver (Ag) Low Level 0.004 0.004 ug/L 1 0.3 < 1/2 RDL Thallium (TI) Low Level 0.013 0.013 ug/L 1 0.2 < 1/2 RDL LCS # 1 Parameter Measured Final Units: Dil Spike % Recovery LCL UCL Qualifier Antimony (Sb) 50.9 50.9 ug/L 1 50 102 85 115 Arsenic (As) 50.5 50.5 ug/L 1 50 101 85 115 Beryllium (Be) 50.1 50.1 ug/L 1 50 100 85 115 Cadmium (Cd) 51.7 51.7 ug/L 1 50 103 85 115 Chromium (Cr) 51.2 51.2 ug/L 1 50 102 85 115 Copper (Cu) 51.5 51.5 ug/L 1 50 103 85 115 Lead (Pb) 50.7 50.7 ug/L 1 50 101 85 115 Nickel (Ni) 51.3 51.3 ug/L 1 50 103 85 115 Selenium (Se) 50.2 50.2 ug/L 1 50 100 85 115 Silver (Ag) Low Level 52.2 52.2 ug/L 1 50 104 85 115 Thallium (TI) Low Level 49.3 49.3 ug/L 1 50 98.6 85 115 LCS # 2 Parameter Measured Final Units: Dil Spike % Recovery LCL UCL Qualifier Antimony (Sb) 52.1 52.1 ug/L 1 50 104 85 115 Arsenic (As) 51.8 51.8 ug/L 1 50 104 85 115 Beryllium (Be) 50.4 50.4 ug/L 1 50 101 85 115 Cadmium (Cd) 50.7 50.7 ug/L 1 50 101 85 115 Chromium (Cr) 50.2 50.2 ug/L 1 50 100 85 115 Copper (Cu) 51.9 51.9 ug/L 1 50 104 85 115 Lead (Pb) 51.4 51.4 ug/L 1 50 103 85 115 Nickel (Ni) 51.8 51.8 ug/L 1 50 104 85 115 Selenium (Se) 50 50 ug/L 1 50 100 85 115 Silver (Ag) Low Level 51.8 51.8 ug/L 1 50 104 85 115 Thallium (TI) Low Level 49.1 49.1 ug/L 1 50 98.2 85 115 Certificate of Laboratory Analysis 14 of 55 This report shall not be reproduced, except in full. Order # J22100047 Level II QC Summary Q22100040 IMS_TRM TOTAL RECOVERABLE METALS BY ICP-MS LCS # 3 Parameter Measured Final Units: Dil Spike % Recovery LCL UCL Qualifier Antimony (Sb) 51.1 51.1 ug/L 1 50 102 85 115 Arsenic (As) 50.8 50.8 ug/L 1 50 102 85 115 Beryllium (Be) 51.2 51.2 ug/L 1 50 102 85 115 Cadmium (Cd) 51 51 ug/L 1 50 102 85 115 Chromium (Cr) 50.7 50.7 ug/L 1 50 101 85 115 Copper(Cu) 51 51 ug/L 1 50 102 85 115 Lead (Pb) 50.9 50.9 ug/L 1 50 102 85 115 Nickel (Ni) 51.3 51.3 ug/L 1 50 103 85 115 Selenium (Se) 51.8 51.8 ug/L 1 50 104 85 115 Silver (Ag) Low Level 51.2 51.2 ug/L 1 50 102 85 115 Thallium (TI) Low Level 49.3 49.3 ug/L 1 50 98.6 85 115 LCS # 4 Parameter Measured Final Units: Dil Spike % Recovery LCL UCL Qualifier Antimony (Sb) 51.7 51.7 ug/L 1 50 103 85 115 Arsenic (As) 50.3 50.3 ug/L 1 50 101 85 115 Beryllium (Be) 50.3 50.3 ug/L 1 50 101 85 115 Cadmium (Cd) 49.8 49.8 ug/L 1 50 99.6 85 115 Chromium (Cr) 51 51 ug/L 1 50 102 85 115 Copper(Cu) 51 51 ug/L 1 50 102 85 115 Lead (Pb) 51 51 ug/L 1 50 102 85 115 Nickel (Ni) 50.8 50.8 ug/L 1 50 102 85 115 Selenium (Se) 50.1 50.1 ug/L 1 50 100 85 115 Silver (Ag) Low Level 51.7 51.7 ug/L 1 50 103 85 115 Thallium (TI) Low Level 49.3 49.3 ug/L 1 50 98.5 85 115 LCS # 5 Parameter Measured Final Units: Dil Spike % Recovery LCL UCL Qualifier Antimony (Sb) 51.7 51.7 ug/L 1 50 103 85 115 Arsenic (As) 51.1 51.1 ug/L 1 50 102 85 115 Beryllium (Be) 48.7 48.7 ug/L 1 50 97.4 85 115 Cadmium (Cd) 51.7 51.7 ug/L 1 50 103 85 115 Chromium (Cr) 51.9 51.9 ug/L 1 50 104 85 115 Copper (Cu) 52.6 52.6 ug/L 1 50 105 85 115 Lead (Pb) 51.9 51.9 ug/L 1 50 104 85 115 Nickel (Ni) 52.3 52.3 ug/L 1 50 105 85 115 Selenium (Se) 50.3 50.3 ug/L 1 50 101 85 115 Silver (Ag) Low Level 52.9 52.9 ug/L 1 50 106 85 115 Thallium (TI) Low Level 50.7 50.7 ug/L 1 50 101 85 115 Level II QC Summary Q22100040 IMS_TRM MS # 1 Certificate of Laboratory Analysis This report shall not be reproduced, except in full. Order # J22100047 TOTAL RECOVERABLE METALS BY ICP-MS Parameter Measured Final Units: Dil Spike Antimony (Sb) 53.7 53.7 ug/L 1 50 Arsenic (As) 58.7 58.7 ug/L 1 50 Beryllium (Be) 50.9 50.9 ug/L 1 50 Cadmium (Cd) 49.8 49.8 ug/L 1 50 Chromium (Cr) 49.8 49.8 ug/L 1 50 Copper (Cu) 51.7 51.7 ug/L 1 50 Lead (Pb) 50.4 50.4 ug/L 1 50 Nickel (Ni) 56.3 56.3 ug/L 1 50 Selenium (Se) 74 74 ug/L 1 50 Silver (Ag) Low Level 50.2 50.2 ug/L 1 50 Thallium (TI) Low Level 49.5 49.5 ug/L 1 50 MSD # 1 Parameter Measured Final Units: Dil Spike Antimony (Sb) 53.3 53.3 ug/L 1 50 Arsenic (As) 59.6 59.6 ug/L 1 50 Beryllium (Be) 50.1 50.1 ug/L 1 50 Cadmium (Cd) 49.9 49.9 ug/L 1 50 Chromium (Cr) 50.2 50.2 ug/L 1 50 Copper (Cu) 51.6 51.6 ug/L 1 50 Lead (Pb) 50 50 ug/L 1 50 Nickel (Ni) 56.1 56.1 ug/L 1 50 Selenium (Se) 74.7 74.7 ug/L 1 50 Silver (Ag) Low Level 50.4 50.4 ug/L 1 50 Thallium (TI) Low Level 49.7 49.7 ug/L 1 50 Parent Sample: J22090128 -- 2022023542 15 of 55 % Recovery LCL UCL Qualifier 102 70 130 102 70 130 101 70 130 99.4 70 130 98.9 70 130 99.9 70 130 100 70 130 101 70 130 97.7 70 130 100 70 130 97.8 70 130 Parent Sample: J22090128 -- 2022023542 % Recovery LCL UCL RPD Qualifier 101 70 130 0.718 103 70 130 1.65 99.9 70 130 1.58 99.5 70 130 0.0422 99.6 70 130 0.679 99.6 70 130 0.293 99.7 70 130 0.764 101 70 130 0.26 99.1 70 130 1.48 101 70 130 0.477 98.2 70 130 0.414 Certificate of Laboratory Analysis 16 of 55 This report shall not be reproduced, except in full. Order # J22100047 Level II QC Summary Q22100024 TSS_LL Total Suspended Solids - Low RL 2.5 Blank # 1 Parameter Measured Final Units: Dil RDL Relative Concentration Qualifier TSS 0 mg/L 1 2.5 < 1/2 RDL Duplicate # 1 Parent Sample: J22090541 -- 2022025681 Parameter Measured Final Units: Dil Limit Range RPD Qualifier TSS 11.3 mg/L 1 6.39 LCS # 1 Parameter Measured Final Units: Dil Spike % Recovery LCL UCL Qualifier TSS 90 mg/L 1 100 90 90 110 leAnalyiical www.pacelabs.com Pace Analytical Services, LLC 9800 Klice. Suite 100 Huntersville, NC 28078 (704)875-9092 October 11, 2022 Program Manager Duke Energy 13339 Hagers Ferry Road Bldg.7405 MG30A2 Huntersville, NC 28078 RE: Project: J22100047 ALN SW Pace Project No.: 92629130 Dear Program Manager: Enclosed are the analytical results for sample(s) received by the laboratory on October 04, 2022. The results relate only to the samples included in this report. Results reported herein conform to the applicable TNI/NELAC Standards and the laboratory's Quality Manual, where applicable, unless otherwise noted in the body of the report. The test results provided in this final report were generated by each of the following laboratories within the Pace Network: • Pace Analytical Services - Charlotte If you have any questions concerning this report, please feel free to contact me. Sincerely, %D'a6- Nicole D'Oleo nicole.d'oleo@pacelabs.com (704)875-9092 Project Manager Enclosures REPORT OF LABORATORY ANALYSIS This report shall not be reproduced, except in full, without the written consent of Pace Analytical Services, LLC. Page 1 of 16 leAnalyiical www.pacelabs.com Pace Analytical Services, LLC 9800 Kligc6r&ie. Suite 100 Huntersville, NC 28078 (704)875-9092 Project: J22100047 ALN SW Pace Project No.: 92629130 Pace Analytical Services Charlotte South Carolina Laboratory ID: 99006 9800 Kincey Ave. Ste 100, Huntersville, NC 28078 North Carolina Drinking Water Certification #: 37706 North Carolina Field Services Certification #: 5342 North Carolina Wastewater Certification #: 12 South Carolina Laboratory ID: 99006 CERTIFICATIONS South Carolina Certification #: 99006001 South Carolina Drinking Water Cert. #: 99006003 Florida/NELAP Certification #: E87627 Kentucky UST Certification #: 84 Louisiana DoH Drinking Water #: LA029 VirginiaNELAP Certification #: 460221 REPORT OF LABORATORY ANALYSIS This report shall not be reproduced, except in full, without the written consent of Pace Analytical Services, LLC. Page 2 of 16 leAnalyiical www.pacelabs.com Pace Analytical Services, LLC 9800 K�i�ce. Suite 100 Huntersville, NC 28078 (704)875-9092 SAMPLE SUMMARY Project: J22100047 ALN SW Pace Project No.: 92629130 Lab ID Sample ID Matrix Date Collected Date Received 92629130001 2022025935 Water 09/30/2211:10 10/04/22 14:05 92629130002 2022025936 Water 09/30/22 10:00 10/04/22 14:05 92629130003 2022025937 Water 09/30/22 10:25 10/04/22 14:05 92629130004 2022025938 Water 09/30/2211:45 10/04/22 14:05 REPORT OF LABORATORY ANALYSIS This report shall not be reproduced, except in full, without the written consent of Pace Analytical Services, LLC. Page 3 of 16 leAnalyiical www.pacelabs.com Pace Analytical Services, LLC 9800 tf��ce. Suite 100 Huntersville, NC 28078 (704)875-9092 SAMPLE ANALYTE COUNT Project: J22100047 ALN SW Pace Project No.: 92629130 Analytes Lab ID Sample ID Method Analysts Reported Laboratory 92629130001 2022025935 EPA1664B REL 1 PASI-C 92629130002 2022025936 EPA1664B REL 1 PASI-C 92629130003 2022025937 EPA1664B REL 1 PASI-C 92629130004 2022025938 EPA1664B REL 1 PASI-C PASI-C = Pace Analytical Services - Charlotte REPORT OF LABORATORY ANALYSIS This report shall not be reproduced, except in full, without the written consent of Pace Analytical Services, LLC. Page 4 of 16 leAnalyiical www.pacelabs.com Pace Analytical Services, LLC 9800 If�nicgr&ie. Suite 100 Huntersville, NC 28078 (704)875-9092 PROJECT NARRATIVE Project: J22100047 ALN SW Pace Project No.: 92629130 Method: EPA 1664B Description: 1664 SGT-HEM, TPH Client: Duke Energy Date: October 11, 2022 General Information: 4 samples were analyzed for EPA 1664B by Pace Analytical Services Charlotte. All samples were received in acceptable condition with any exceptions noted below or on the chain -of custody and/or the sample condition upon receipt form (SCUR) attached at the end of this report. Hold Time: The samples were analyzed within the method required hold times with any exceptions noted below. Initial Calibrations (including MS Tune as applicable): All criteria were within method requirements with any exceptions noted below. Continuing Calibration: All criteria were within method requirements with any exceptions noted below. Surrogates: All surrogates were within QC limits with any exceptions noted below. Method Blank: All analytes were below the report limit in the method blank, where applicable, with any exceptions noted below. Laboratory Control Spike: All laboratory control spike compounds were within QC limits with any exceptions noted below. Matrix Spikes: All percent recoveries and relative percent differences (RPDs) were within acceptance criteria with any exceptions noted below. Duplicate Sample: All duplicate sample results were within method acceptance criteria with any exceptions noted below. Additional Comments: This data package has been reviewed for quality and completeness and is approved for release. REPORT OF LABORATORY ANALYSIS This report shall not be reproduced, except in full, without the written consent of Pace Analytical Services, LLC. Page 5 of 16 leAnalyiical www.pacelabs.com Pace Analytical Services, LLC 9800 I Qcgr&ie. Suite 100 Huntersville, NC 28078 (704)875-9092 ANALYTICAL RESULTS Project: J22100047 ALN SW Pace Project No.: 92629130 Sample: 2022025935 Lab ID: 92629130001 Collected: 09/30/22 11:10 Received: 10/04/22 14:05 Matrix: Water Parameters Results Units Report Limit DF Prepared Analyzed CAS No. Qual 1664 SGT-HEM, TPH Analytical Method: EPA 1664E Pace Analytical Services - Charlotte Total Petroleum Hydrocarbons ND mg/L 4.9 1 10/11/22 03:15 REPORT OF LABORATORY ANALYSIS This report shall not be reproduced, except in full, Date: 10/11 /2022 01:48 PM without the written consent of Pace Analytical Services, LLC. Page 6 of 16 leAnalyiical www.pacelabs.com Pace Analytical Services, LLC 9800 t Sgig &ie. Suite 100 Huntersville, NC 28078 (704)875-9092 ANALYTICAL RESULTS Project: J22100047 ALN SW Pace Project No.: 92629130 Sample: 2022025936 Lab ID: 92629130002 Collected: 09/30/22 10:00 Received: 10/04/22 14:05 Matrix: Water Parameters Results Units Report Limit DF Prepared Analyzed CAS No. Qual 1664 SGT-HEM, TPH Analytical Method: EPA 1664E Pace Analytical Services - Charlotte Total Petroleum Hydrocarbons ND mg/L 4.8 1 10/11/22 03:15 REPORT OF LABORATORY ANALYSIS This report shall not be reproduced, except in full, Date: 10/11 /2022 01:48 PM without the written consent of Pace Analytical Services, LLC. Page 7 of 16 leAnalyiical www.pacelabs.com Pace Analytical Services, LLC 9800 %cfr&ie. Suite 100 Huntersville, NC 28078 (704)875-9092 ANALYTICAL RESULTS Project: J22100047 ALN SW Pace Project No.: 92629130 Sample: 2022025937 Lab ID: 92629130003 Collected: 09/30/22 10:25 Received: 10/04/22 14:05 Matrix: Water Parameters Results Units Report Limit DF Prepared Analyzed CAS No. Qual 1664 SGT-HEM, TPH Analytical Method: EPA 1664E Pace Analytical Services - Charlotte Total Petroleum Hydrocarbons ND mg/L 4.9 1 10/11/22 03:15 REPORT OF LABORATORY ANALYSIS This report shall not be reproduced, except in full, Date: 10/11 /2022 01:48 PM without the written consent of Pace Analytical Services, LLC. Page 8 of 16 leAnalyiical www.pacelabs.com Pace Analytical Services, LLC 9800 %cfr&ie. Suite 100 Huntersville, NC 28078 (704)875-9092 ANALYTICAL RESULTS Project: J22100047 ALN SW Pace Project No.: 92629130 Sample: 2022025938 Lab ID: 92629130004 Collected: 09/30/22 11:45 Received: 10/04/22 14:05 Matrix: Water Parameters Results Units Report Limit DF Prepared Analyzed CAS No. Qual 1664 SGT-HEM, TPH Analytical Method: EPA 1664E Pace Analytical Services - Charlotte Total Petroleum Hydrocarbons ND mg/L 4.9 1 10/11/22 03:15 REPORT OF LABORATORY ANALYSIS This report shall not be reproduced, except in full, Date: 10/11 /2022 01:48 PM without the written consent of Pace Analytical Services, LLC. Page 9 of 16 leAnalyiical www.pacelabs.com Pace Analytical Services, LLC 9800 %cfr&ie. Suite 100 Huntersville, NC 28078 (704)875-9092 QUALITY CONTROL DATA Project: J22100047 ALN SW Pace Project No.: 92629130 QC Batch: 728933 Analysis Method: EPA 1664B QC Batch Method: EPA 1664E Analysis Description: 1664 SGT-HEM, TPH Laboratory: Pace Analytical Services - Charlotte Associated Lab Samples: 92629130001, 92629130002, 92629130003, 92629130004 METHOD BLANK: 3796196 Matrix: Water Associated Lab Samples: 92629130001, 92629130002, 92629130003, 92629130004 Blank Reporting Parameter Units Result Limit Analyzed Qualifiers Total Petroleum Hydrocarbons mg/L ND 5.0 10/11/22 03:15 LABORATORY CONTROL SAMPLE: 3796197 Spike LCS LCS % Rec Parameter Units Conc. Result % Rec Limits Qualifiers Total Petroleum Hydrocarbons mg/L 20 13.5 68 64-132 MATRIX SPIKE SAMPLE: 3796198 92629851001 Spike MS MS % Rec Parameter Units Result Conc. Result % Rec Limits Qualifiers Total Petroleum Hydrocarbons mg/L ND 19.2 18.8 88 64-132 SAMPLE DUPLICATE: 3796199 92629949001 Dup Max Parameter Units Result Result RPD RPD Qualifiers Total Petroleum Hydrocarbons mg/L ND ND 30 Results presented on this page are in the units indicated by the "Units" column except where an alternate unit is presented to the right of the result. REPORT OF LABORATORY ANALYSIS This report shall not be reproduced, except in full, Date: 10/11/2022 01:48 PM without the written consent of Pace Analytical Services, LLC. Page 10 of 16 leAnalyiical www.pacelabs.com Pace Analytical Services, LLC 9800 "cfr&ie. Suite 100 Huntersville, NC 28078 (704)875-9092 QUALIFIERS Project: J22100047 ALN SW Pace Project No.: 92629130 DEFINITIONS DF - Dilution Factor, if reported, represents the factor applied to the reported data due to dilution of the sample aliquot. ND - Not Detected at or above adjusted reporting limit. TNTC - Too Numerous To Count J - Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit. MDL -Adjusted Method Detection Limit. PQL - Practical Quantitation Limit. RL - Reporting Limit - The lowest concentration value that meets project requirements for quantitative data with known precision and bias for a specific analyte in a specific matrix. S - Surrogate 1,2-Diphenylhydrazine decomposes to and cannot be separated from Azobenzene using Method 8270. The result for each analyte is a combined concentration. Consistent with EPA guidelines, unrounded data are displayed and have been used to calculate % recovery and RPD values. LCS(D) - Laboratory Control Sample (Duplicate) MS(D) - Matrix Spike (Duplicate) DUP - Sample Duplicate RPD - Relative Percent Difference NC - Not Calculable. SG - Silica Gel - Clean -Up U - Indicates the compound was analyzed for, but not detected. Acid preservation may not be appropriate for 2 Chloroethylvinyl ether. A separate vial preserved to a pH of 4-5 is recommended in SW846 Chapter 4 for the analysis of Acrolein and Acrylonitrile by EPA Method 8260. N-Nitrosodiphenylamine decomposes and cannot be separated from Diphenylamine using Method 8270. The result reported for each analyte is a combined concentration. Reported results are not rounded until the final step prior to reporting. Therefore, calculated parameters that are typically reported as "Total" may vary slightly from the sum of the reported component parameters. Pace Analytical is TNI accredited. Contact your Pace PM for the current list of accredited analytes. TN -The NELAC Institute. REPORT OF LABORATORY ANALYSIS This report shall not be reproduced, except in full, Date: 10/11/2022 01:48 PM without the written consent of Pace Analytical Services, LLC. Page 11 of 16 leAnalyiical www.pacelabs.com Pace Analytical Services, LLC 9800 tf�gce. Suite 100 Huntersville, NC 28078 (704)875-9092 QUALITY CONTROL DATA CROSS REFERENCE TABLE Project: J22100047 ALN SW Pace Project No.: 92629130 Lab ID Sample ID QC Batch Method QC Batch Analytical Method 92629130001 2022025935 EPA1664B 728933 92629130002 2022025936 EPA1664B 728933 92629130003 2022025937 EPA1664B 728933 92629130004 2022025938 EPA1664B 728933 Date: 10/11/2022 01:48 PM REPORT OF LABORATORY ANALYSIS This report shall not be reproduced, except in full, without the written consent of Pace Analytical Services, LLC. Analytical Batch Page 12 of 16 �l�ace uc.f►-_I Isle: mvv-t-tiivi-rtUN-i-UVu,5 vu'1 Sample Uonclition upon Receipt Effective Date: 05/12/202205/12/2022 Laboratory receiving samples: Asheville ❑ Eden[] Greenwood ❑ Huntersville 5� Raleigh❑ Mechanicsville❑ Atlanta❑ Kernersvillef-1 ReceiptSample Upon Client Name: WD : 92629130 Project A. Courier ❑,Fed Ex ❑UPS ❑U5P5 ❑Client ❑ IIIII1111111111111111 Commercial Pace ❑Other; Custody Seal Present? MYesa Seals Intact? 5Yes ❑No Date/initials Person Examining Contents: C1 ——72 Packing Material: [—]Bubble Wrap Bubble Bags ❑None ❑ Other Biological Tissue Frozen? Thermometer: []Yes ❑No CaN/A �IRGun ID: Type of Ice: nwet ❑blue ❑Name Correction Factor: Cooler Temp: ` ' L Add/Subtract (,C) u U Temp should be above freezing to 6°C has begun Cooler Temp Corrected (°[): ❑e Gut of temp criteria, Samples on ice, cooling process USDA Regulated Soil ( [Z�N/A, water sample) Did samples originate in a quarantine zone within the United States: CA. NY. or SC Did samnles nr1Pinara from a Mr.i.. ­r;..+e com maps)? LIYes L1No Chain of Custody Present? RlYes ❑No [I N/A 1. Samples Arrived within Hold Time? OYES ❑No ❑N/A 2. Short Hold Time Analysis (e72 hr.)? ❑Yes [9No ❑N/A 3. Rush Turn Around Time Requested? ❑Yes EINO ❑N/A 4. Sufficient Volume? Myes ❑No ❑N/A 5. Correct Containers Used? (Yes ❑No ❑N/A 6: -Pace Containers Used? Elva. I klI MKI/A Containers Intact? Dissolved analysis: Samples Field Filtered? sample Labels Match CDC? Yes ❑NO ❑N/A 7. ❑Yes [:]No -N/A a. 9Yes ❑No ❑N/A 9. Hawaii and Puerto Rico)? ❑Yes ❑No Comm ents/DIscreoancv: -Includes Date/Time/ID/Analysis Matrix: Headspace in VOA Vials (>5-6mm)? ❑Yes &INo E�N/A 10. Trip Blank Present? ❑Yes f;2W [I N/A 11. Trip Blank Custody Seals Present? Des ❑NO /A MENTS/SAMPLE DISCREPANCY field Data Required? ❑Yes DNo Lot ID of split containers: CLIENT NOTIFICATION/RESOLUTION Person contacted: Project Manager SCURF Review: Drniert NlanaPar SRF Ra�lic++ti+• Date/Time: Date: Page 13 of 16 Qualtrax ID: 69614 Page 1 of 2 Id, CI4v-r'K1Yf-r1UN1-UUbJ vU1 Sample Condition Upon Receipt ace 30 of 55 Effective Date: 05/121202205/12/2022 *Check mark top half of box if pH and/or dechlorination is verified and within the acceptance range for preservation samples. Exceptions; VOA, Coliform, TOC, Oil and Grease, DRO/8015 (water) DOC, LLHg **Bottom half of box is to list number of bottles ***Check all unpreserved Nitrates for chlorine Protect # WO# : 92 fiZ9130 PM: NMG Due Dater 10/11/22 CLIENT: 92-Duke En@r• a u 0 v ¢ a q _ _ _ _ _ N ey ` z b M m _ m N Gl al �p V V A _ Gi N V _ Ol Q > ai V Q z Y Q Q 7 z a of 4 R a V al a Z 1 U N Z m v m m v m N m = w g o N i `p_ a s?. a O p m a y a d o v Q ^� y z Z 4 a c = Z z c c N z ? C14O v a a H to iCL c CL u S NJZ v S = ? S z in 4 a O '° '° z S o c U u x = m en a a ° °�� J E a ¢ a E a 4 O O O 4 o c v E £ n o a Q: E E E £ v tli m E v E E -a - 4 - - u J � ry Q ut `r' `n W = tNoy o o E E E £ a E E E o I E 7 N N N ,Ny N 0 as V i w a a a a a m a V i7 l7 lm:l l7 M l9 ( m rn rn m Ln � M o = aai '—' a! m m m o0 m m m ;a S C Q Q C O A 7 ? 6 q ? aa. m Q j p 1 2 3 4 5 5 7 8 9 10 11 12 PH Adjustment Log for Preserved Samples Sample ID Type of Preservative pH upon receipt Date preservation adjusted Time preservation Amount of Preservative LoE# ad]usted added ilwiv; Wiienever [here is a discrepancy aftecting North Carolina compliance samples, a copy of this form will be sent to the North Carolina OENR Certification Office (Le, Out of hold, incorrect preservative, out of temp, incorrect containers. Page 14 of 16 Qualtrax ID: 69614 Page 2 of 2 M1 31 of 55 to r r O J W 6 j O J ro r J V d} Q Q m mjE n N O a ¢ U Q f.—•— —•-----•— xi 0 I z en0 a N IU 3: w N C sJauieauoo 10 # plojaz (spun) (AJV84S) 49gL Vd3 N3H -195 ! rn a a 0 a a Wea4s) 909 Vd3 aid C m 'q O Z a rr: C7 01e94g) LM 6H I R 5 E me N LL s sl 10 (7l 11 'a5 'qs '4d '!N no y 'Jo 'PD '�a 'SV '11&V) NHi sm W (uZ'a) Nui dol I� ❑ I (% J I O W I � Z c O �� z aaln ay S I(e V.t ❑ C 0 11 mp I R U)� z o! ( V x � fJ Q;a f �- Ca I ❑ I a 'm I C31 rr o 0 O L z o 0. a Z n v. U — 1° � a u a d o a •r 5 m a p O W_ gym+ . c.3 d` a C L 7+ C m emi N (D N c m E J �" a0. o tl Cl)IM c (D > c c Q C u r tp u R Q ` C N U Q a�i p F � u .. 'u O V � � Z ° u o c T. > a. a` m a c U v1 �'• m sn a�alowo] 7snw i�ww��l] dwoot v00000=���irir �r�. d �c m E C m fn W C C � 0 v Ol O � o '`•1 m m{A m � o L 0 r O •� r a N f+7 tf1 t• W Q1 O O O 4 •O C1 T•• O O O O O O r Cr1 �iy pj A v C _ a v to u7 sn CL in t Ecn Z = U LL S 0 E Z � a Ue r Ul - 1u61J pl SUwnl03 alepdoidda ala!dwpp Ol Iawolsno- - - I � 7,1 wi to - T T m m L9 Page 15 of 16 32 of 55 LL I— LL c w cc U) J z a z 0 U w 0 r IL z C3 d N O E [n O I1) .n J 4- z siaulelu00 }o # I210loe (sHUn) 7 a C Q � 2 ) n �j •` � N fJ m - W iJ . Q ' (AlmIS) V99L Vd3 W3H -.IJS l� N (Alm4S) 809 Hd3 80d (AIE04S) 1091 6H N N 1 1 1 KA {ll I1 'a5 'qS'qd � 'nil _ I I r I r l r l r I r l T I r 'JO 'pO 'a8 �sV "ll bV) 6y} WH, SWI l` (UVH) WHL dSl i u v N C,S lift r c: 4t 4! aY 0 a a T -----------; i ) I � � I a C ! c I u.41 V��I ,y �zd,voj 1 4 m to —, C.)i9 I ro mI Z N c Z a N — c r 0 m m cv 7 1 C1 4 j v M c LLj a C U = I N G I I 1C m � T U3 c LU cu Q Lu Cl W '[ z CU a m c c 3 o` m O aialdwo3 Isnw jawojsn3 •dwa�t� •\V � J c O � N E I of c 1 � J . _L) O y o U � a a a y a ¢ a En � O o � O � r c a C p Iu o D O mCL P� t@. C) c) c) M M M C2 r0 O O Cctu r- C U m y 0 0 O O C C 2r ?� Y o m c 3 ❑ fn v) (n U) ro G n E E E M •� w x In In In (n d) fn 5 CLl ..� m �, o k k c E QI ycm n ra IC T � N _� x N V Y1 9 17 A 73 r m Z \ m d O Ez 'a G)CLd m a Ow u C fn 0 a0 rs14fiY of suwnloo alepdoAdde aleldwoo of jewoleno m Lilil ow m EnJ III Page 16 of 16 33 of 55 0 aceAnalytical Report of Analysis Duke Energy 13339 Hagers Ferry Rd Bldg 7405 Huntersville, NC 28078 Attention: Jason Robinson Project Name: Allen Stormwater Project Number: J22100047 Lot Number:XJ06030 Date Completed:10/11/2022 10/13/2022 12:21 PM Approved and released by: Project Coordinator 1: Jenna S. Holliday pCC/►F0 ANSI National Accreditation Board qe� A C C R E D I T E D TESTING LABORATORY The electronic signature above is the equivalent of a handwritten signature. This report shall not be reproduced, except in its entirety, without the written approval of Pace Analytical Services, LLC. Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) 106 Vantage Point Drive West Columbia, SC 29172 Tel:803-791-9700 Fax:803-791-9111 www.pacelabs.com Page 1 of 21 34 of 55 PACE ANALYTICAL SERVICES, LLC SC DHEC No: 32010001 NELAC No: E87653 NC DENR No: 329 NC Field Parameters No: 5639 Case Narrative Duke Energy Lot Number: XJ06030 This Report of Analysis contains the analytical result(s) for the sample(s) listed on the Sample Summary following this Case Narrative. The sample receiving date is documented in the header information associated with each sample. All results listed in this report relate only to the samples that are contained within this report. Where sampling is conducted by the client, results relate to the accuracy of the information provided, and as the samples are received. Sample receipt, sample analysis, and data review have been performed in accordance with the most current approved The NELAC Institute (TNI) standards, the Pace Analytical Services, LLC ("Pace") Laboratory Quality Manual, standard operating procedures (SOPS), and Pace policies. Any exceptions to the TNI standards, the Laboratory Quality Manual, SOPS or policies are qualified on the results page or discussed below. Pace is a TNI accredited laboratory; however, the following analyses are currently not listed on our TNI scope of accreditation: Drinking Water: VOC (excluding BTEX, MTBE, Naphthalene, & 1,2- dichloroethane) EPA 524.2, E. coli and Total coliforms SM 9223 B-2004, Solid Chemical Material: TOC Walkley-Black, Biological Tissue: All, Non -Potable Water: SGT-HEM EPA 1664B, Silica EPA 200.7, Boron, Calcium, Silicon, Strontium EPA 200.8, Bicarbonate, Carbonate, and Hydroxide Alkalinity SM 2320 B-2011, SM 9221 C E-2006 & SM 9222D-2006, Strontium SW-846 6010D, VOC SM 6200 B-2011, Fecal Coliform Colilert-18. If you have any questions regarding this report, please contact the Pace Project Manager listed on the cover page. Pace Analytical Services, LLC (formerly Shealy Environmetal Services, Inc.) 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Page 2 of 21 PACE ANALYTICAL SERVICES, LLC Sample Summary Duke Energy Lot Number: XJ06030 Project Name: Allen Stormwater Project Number: J22100047 Sample Number Sample ID Matrix Date Sampled Date Received 001 2022025935 Aqueous 09/30/20221110 10/05/2022 002 2022025936 Aqueous 09/30/20221000 10/05/2022 003 2022025937 Aqueous 09/30/20221025 10/05/2022 004 2022025938 Aqueous 09/30/20221145 10/05/2022 005 2022025939 Aqueous 09/30/20221025 10/05/2022 006 2022025940 Aqueous 09/30/20221045 10/05/2022 007 2022025941 Aqueous 09/30/20221050 10/05/2022 (7 samples) Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Page 3 of 21 PACE ANALYTICAL SERVICES, LLC Detection Summary Duke Energy Lot Number: XJ06030 Project Name: Allen Stormwater Project Number: J22100047 Sample Sample ID Matrix Parameter Method Result Q Units Page 001 2022025935 Aqueous Mercury (CVAFS) 1631E 3.80 ng/L 5 002 2022025936 Aqueous Mercury (CVAFS) 1631E 5.58 ng/L 6 003 2022025937 Aqueous Mercury (CVAFS) 1631E 1.53 ng/L 7 004 2022025938 Aqueous Mercury (CVAFS) 1631E 15.6 ng/L 8 005 2022025939 Aqueous Mercury (CVAFS) 1631E 1.46 ng/L 9 (5 detections) Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Page 4 of 21 Mercury (CVAFS) Client: Duke Energy Laboratory ID:XJ06030-001 Description: 2022025935 Matrix: Aqueous Date Sampled:09/30/2022 1110 Project Name: Allen Stormwater Date Received:10/05/2022 Project Number: J22100047 Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch 1 1631 E 1 10/11/2022 0614 JA132 10/08/2022 0644 56309 CAS Analytical Parameter Number Method Result Q LOQ Units Run Mercury (CVAFS) 7439-97-6 1631 E 3.80 0.500 ng/L 1 LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range Q = Surrogate failure NO = Not detected at or above the LOQ N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40 % L = LCS/LCSD failure H = Out of holding time W = Reported on wet weight basis S = MS/MSD failure Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Page 5 of 21 Mercury (CVAFS) Client: Duke Energy Laboratory ID:XJ06030-002 Description: 2022025936 Matrix: Aqueous Date Sampled:09/30/2022 1000 Project Name: Allen Stormwater Date Received:10/05/2022 Project Number: J22100047 Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch 1 1631 E 1 10/11/2022 0619 JA132 10/08/2022 0644 56309 CAS Analytical Parameter Number Method Result Q LOQ Units Run Mercury (CVAFS) 7439-97-6 1631 E 5.58 0.500 ng/L 1 LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range Q = Surrogate failure NO = Not detected at or above the LOQ N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40 % L = LCS/LCSD failure H = Out of holding time W = Reported on wet weight basis S = MS/MSD failure Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Page 6 of 21 Mercury (CVAFS) Client: Duke Energy Laboratory ID:XJ06030-003 Description: 2022025937 Matrix: Aqueous Date Sampled:09/30/2022 1025 Project Name: Allen Stormwater Date Received:10/05/2022 Project Number: J22100047 Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch 1 1631 E 1 10/11/2022 0625 JA132 10/08/2022 0644 56309 CAS Analytical Parameter Number Method Result Q LOQ Units Run Mercury (CVAFS) 7439-97-6 1631 E 1.53 0.500 ng/L 1 LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range Q = Surrogate failure NO = Not detected at or above the LOQ N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40 % L = LCS/LCSD failure H = Out of holding time W = Reported on wet weight basis S = MS/MSD failure Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Page 7 of 21 Mercury (CVAFS) Client: Duke Energy Laboratory ID:XJ06030-004 Description: 2022025938 Matrix: Aqueous Date Sampled:09/30/2022 1145 Project Name: Allen Stormwater Date Received:10/05/2022 Project Number: J22100047 Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch 1 1631 E 1 10/11/2022 0641 JA132 10/08/2022 0644 56309 CAS Analytical Parameter Number Method Result Q LOQ Units Run Mercury (CVAFS) 7439-97-6 1631 E 15.6 0.500 ng/L 1 LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range Q = Surrogate failure NO = Not detected at or above the LOQ N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40 % L = LCS/LCSD failure H = Out of holding time W = Reported on wet weight basis S = MS/MSD failure Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Page 8 of 21 Mercury (CVAFS) Client: Duke Energy Laboratory ID:XJ06030-005 Description: 2022025939 Matrix: Aqueous Date Sampled:09/30/2022 1025 Project Name: Allen Stormwater Date Received:10/05/2022 Project Number: J22100047 Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch 1 1631 E 1 10/11/2022 0647 JA132 10/08/2022 0644 56309 CAS Analytical Parameter Number Method Result Q LOQ Units Run Mercury (CVAFS) 7439-97-6 1631 E 1.46 0.500 ng/L 1 LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range Q = Surrogate failure NO = Not detected at or above the LOQ N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40 % L = LCS/LCSD failure H = Out of holding time W = Reported on wet weight basis S = MS/MSD failure Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Page 9 of 21 Mercury (CVAFS) Client: Duke Energy Laboratory ID:XJ06030-006 Description: 2022025940 Matrix: Aqueous Date Sampled:09/30/2022 1045 Project Name: Allen Stormwater Date Received:10/05/2022 Project Number: J22100047 Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch 1 1631 E 1 10/11/2022 0652 JA132 10/08/2022 0644 56309 CAS Analytical Parameter Number Method Result Q LOQ Units Run Mercury(CVAFS) 7439-97-6 1631E ND 0.500 ng/L 1 LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range Q = Surrogate failure NO = Not detected at or above the LOQ N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40 % L = LCS/LCSD failure H = Out of holding time W = Reported on wet weight basis S = MS/MSD failure Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Page 10 of 21 Mercury (CVAFS) Client: Duke Energy Laboratory ID:XJ06030-007 Description: 2022025941 Matrix: Aqueous Date Sampled:09/30/2022 1050 Project Name: Allen Stormwater Date Received:10/05/2022 Project Number: J22100047 Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch 1 1631 E 1 10/11/2022 0658 JA132 10/08/2022 0644 56309 CAS Analytical Parameter Number Method Result Q LOQ Units Run Mercury(CVAFS) 7439-97-6 1631E ND 0.500 ng/L 1 LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range Q = Surrogate failure NO = Not detected at or above the LOQ N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40 % L = LCS/LCSD failure H = Out of holding time W = Reported on wet weight basis S = MS/MSD failure Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Page 11 of 21 QC Summary Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) QC Data for Lot Number: XJ06030 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Page 12 of 21 Mercury (CVAFS) - MB Sample ID: XQ56309-001 Matrix: Aqueous Batch: 56309 Prep Method: Analytical Method: 1631 E Prep Date: 10/08/2022 0644 Parameter Result Q Dil LOQ Units Analysis Date Mercury (CVAFS) ND 1 0.500 ng/L 10/11/2022 0346 LOQ = Limit of Quantitation ND = Not detected at or above the LOQ = RSD is out of criteria N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40 + = RPD is out of criteria Note: Calculations are performed before rounding to avoid round -off errors in calculated results Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Page 13 of 21 QC Data for Lot Number: XJ06030 Mercury (CVAFS) - MB Sample ID: XQ56309-101 Matrix: Aqueous Batch: 56309 Prep Method: Analytical Method: 1631 E Prep Date: 10/08/2022 0644 Parameter Result Q Dil LOQ Units Analysis Date Mercury (CVAFS) ND 1 0.500 ng/L 10/11/2022 0352 LOQ = Limit of Quantitation ND = Not detected at or above the LOQ = RSD is out of criteria N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40 + = RPD is out of criteria Note: Calculations are performed before rounding to avoid round -off errors in calculated results Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Page 14 of 21 QC Data for Lot Number: XJ06030 Mercury (CVAFS) - LCS Sample ID: XQ56309-002 Matrix: Aqueous Batch: 56309 Prep Method: Analytical Method: 1631 E Prep Date: 10/08/2022 0644 Spike Amount Result %Rec Parameter (ng/L) (ng/L) Q Dil % Rec Limit Analysis Date Mercury (CVAFS) 5.00 4.88 1 98 75-125 10/11/2022 0357 LOQ = Limit of Quantitation ND = Not detected at or above the LOQ = RSD is out of criteria N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40 % + = RPD is out of criteria Note: Calculations are performed before rounding to avoid round -off errors in calculated results Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Page 15 of 21 QC Data for Lot Number: XJ06030 Mercury (CVAFS) - MS Sample ID: XJ06030-003MS Matrix: Aqueous Batch: 56309 Prep Method: Analytical Method: 1631 E Prep Date: 10/08/2022 0644 Sample Spike Amount Amount Result %Rec Parameter (ng/L) (ng/L) (ng/L) Q Dil % Rec Limit Analysis Date Mercury (CVAFS) 1.53 5.00 5.94 1 88 71-125 10/11/2022 0630 LOQ = Limit of Quantitation ND = Not detected at or above the LOQ = RSD is out of criteria N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40 % + = RPD is out of criteria Note: Calculations are performed before rounding to avoid round -off errors in calculated results Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Page 16 of 21 QC Data for Lot Number: XJ06030 Mercury (CVAFS) - MSD Sample ID: XJ06030-003MD Matrix: Aqueous Batch: 56309 Prep Method: Analytical Method: 1631 E Prep Date: 10/08/2022 0644 Sample Spike Amount Amount Result %Rec % RPD Parameter (ng/L) (ng/L) (ng/L) Q Dil % Rec % RPD Limit Limit Analysis Date Mercury (CVAFS) 1.53 5.00 5.88 1 87 0.91 71-125 24 10/11/2022 0636 LOQ = Limit of Quantitation ND = Not detected at or above the LOQ = RSD is out of criteria N = Recovery is out of criteria P = The RPD between two GC columns exceeds 40 % + = RPD is out of criteria Note: Calculations are performed before rounding to avoid round -off errors in calculated results Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Page 17 of 21 QC Data for Lot Number: XJ06030 Chain of Custody and Miscellaneous Documents Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Page 18 of 21 PACE ANALYTICAL SERVICES, LLC x,ewe:uaC }a �a1� M n o ` [W},n) I-Ic t x VJE�110 %HBL Vd9 VGA -10€ e o i E [+4�#U91 Bb3 Y3 83c � �O dq C io [ll IF �$`QR'Q-i N <n I a I J Fri � dd is I s Its Q. I . 06 -------------- 3 W i i M; I 0,� 0,_� �t I udt ?31 j C ' C J ' a — ,x c L.. p� ' ' [� _ :r aldu:6j hnyr �owolsna wwo 111111rull �1!l1��®®®®no I L ¢ o , r rJ 13 b] ad to +D OF tin N 3 r d rL °° a } g 3 In _ a enis = G L ILL r a $ cCL C w m aox u $ 4 yll6iJ bt gmi.njaei ilr.-: 1rW e.dv agajffirlum K imawam-_' 25 4f`a Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Page 19 of 21 PACE ANALYTICAL SERVICES, LLC E l2JI�LIf.;J f} � IFYlB� U C'} C LL (man) Hd Idpr�q) 9Bl dd� 4L4I -IM ° �+ a I i m is Ll6 {�&5e1S) go V'13 gzii E } n [7 C j �-1 L'a8'v9 -z''W'ro i a 'pv; 'a6 'i'v 17fl VVU SWI I a �'�L = x r� Pam;°*�i '��al LUI2. !:�. � s,Ills i J, 111110101 MMMMM Mm �g n+ I I I 7 C�* y - A i _ is '! i UJ A ocpa o; p _pdLL �L N` C�'9 # Ib .ny{, 8 v I' •s��� �.J ! � m V � � �i � LL •� � '� L� l9 P] Y �} � O G• � }.� � � Ill x LJ 4 I 7} C d7 r $ - r t W ( _ V J u L pp pip 5 € m 2 � 2 o LU LU R a i dLUG i ei 4 a I 1 m { {?Y.t.11tr�'.48Wl .�ICCj5Y1� I] c} Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Page 20 of 21 PACE ANALYTICAL SERVICES, LLC DC# Title: EW-FRlti+1-V4ML•0286 v02 Surop[wg R@42eipt Qwdclirt (SRCj Lffimrtive Date: 81212C22 Sample Receipt Ch"Idw (s.itc.) 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VVas c0lectjon daba & 11ule listed (Al Hle i2!o amd all sam xtt�, 1'[n tE;kt]IClS f Yes I'o 0. Did all iLAitaiaira-label hifxina"n O:D- arc. time) agrr-C WiTh tk cocr Yes i+10 9. Werr tars to be VcLbnned lisrod rw the CGCI 10- Did all sau3plcs arrive Jsl the propu cautahiers for each tit wdkr ip �00d c In thin nr1 (wibrohui, Us ou. ercP R0 11. WAS ado 14ttc s�BrnplcTohujjc xvari;rbie7 iN�O 12. Were all safnplc." mcelved vrtthill'A ft- hOlding tjtlle 0148 hours. w JLLie%Ti coLb.-s first:' EINn 13. 6W�2M ;tll sF 1141l Ws aotltdl[lers ac [outttecl f i7 (iMTrr inissiu excess) r- Nu ON 14- Were. c]AC rin , 8015d RS -175 samples free of bubbleb �`�TFI-Sloe" (V4"gT 6will hi tunneler} hi stay of the VGA vials? ffNo 13- We1e all DRGii:ue .�Wiiiaatxierit s.'snlpies rburivcd a: pH of ¢ 27o�&N 16- Werc all cymide �am?lcs i �c tivrd at a pH > 12 and sofide samples received at a uH > 9' 17- ��cre ❑ Ycsl ❑+ cl ❑NA�iS. Was the quote jit mba r oil rlte CO11111i.= label? If rs., Quote Sample Pjpser�atitau (��tst be [orjtfl[ere[1 fnr 21l1js,�nplc(s) incorrectly prase�+ed OiwritLL Jlradspaoe-} S aiylplc(s) NIL _ v� el': lee tivecl incorl+ [ly };rcarfv d atjd rovcrc adj s ! at cordltl ' is sffi 1ple ircciv*ig wjth KA mL of circle ooze, KIS04, IIIN{_Y3.11-Cf. Nft()H tL'�in� L,R. J,' WA 15me of presenVstiari � Il route tb izt one plese ratiVC iS load, please nol-e in the comawili s below, Welt Mr-C and -viirh 1jubbl s mm itt, diameter. � S'qff9jeS(S) NAwele feerivud wills MC } 0.5 iri&L (if 919 is no)aildw-m- : adjusted a,ccosdi*y in ssno* rerck6li- with sodium thiosl ll'aE;, (ha1S203) wit Unique ID- NA t<OI1jlllt AS: Dj aArax ID: 56360 ?ate' AnaNUtal 5ervkxa, LLC •r — Pegs I of I Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.) 106 Vantage Point Drive West Columbia, SC 29172 (803) 791-9700 Fax (803) 791-9111 www.pacelabs.com Page 21 of 21 C CHAIN OF CUSTODY RECORD AND ANALYSIS REQUEST FORM — — ........................I r------------------------------------------------------- a ical Laboratory Services i Analytical Laboratory Use Only �' DUKE Mail Code MG03A2 (Building 7405) ! I� Work r Matrix: NPDES Samples 13339 Hagers Ferry Rd ! ! �V Originating From H t ill N C 28078 NC_X i SC_ i OH ENERGY: un ersvt e, . . (980) 875-5245 ............ __.._0)8_-4349_............ Logged by: ! ! Date & TJO1e ,(�I %T/ CJ /l SAMPLE PROGRAM Ground Water_ NPDES )Project Name Allen Stormwater 2)Phone No: Page .t'1 `e (� Other_ Plant PO # 917 Z 71 Z tsPr caralc u -�I RCRA Waste Customer 4)Fax No: 1 Randy Gantt, Liz Glenn 5)Business Unit: 6)Project ID: 7)Mail Code: 8) Operating Unit: 9)Activity ID: 10)Process ID Important: When specific accounting has been established enter that accounitng above. If specific accounting has not established we can work with just the Operating Unit and Process ID. THANKS! LAB USE ONLY.• 12Chem "Lab ID r Deskto No. 13Sam le Description or ID i i o MOW SWO01 A E SWO02 I R 0 I I� SW003 o SWO05 SWO07 C SW008 SWO09 l l E :o SW010 o SW013-07 SWO13-08 :U SWO13-09 i l Hg Dup (1/day or 10%) Hg Field Blank (1/day or 10% ) HgTripBlankj(1/ day) .0-1 r Printari Nam- �i� (, Y�n Customer to complete all appropriate areas_.. 14Collection Information Date I Time I Signature 54 of 55 Page 1 of 1 DISTRIBUTION ORIGINAL to LAB, COPY to CLIENT Revised 2-8-17 m L CO T co ca a) co co T = (V Co 0- cD m w Q 2 w a cO m � = 0- Cf) a (D CZ C CI U O U m 0 o N 21)Relinquished By L, Date/Time 2.� } �u E/ 1 Accepted By: PIt— Date/Time 3/15 (f C 22Requested Turnaround Relinquished By Date/Time Accepted By: Date/Tim I /1 /JC/\dd 14 Days Relinquished By Date/Time ccepted By: Dathrrimi Sealed/Locked By Z Date/Time ✓�' G //a/l � �U a , �coJ C! Sealed/Lo a �t ? Date/Time fv (J/ �(j��% • 48 Hr er 24 Add. Cost Will Apply 24)Comment REPLACE kits upon reciept of samples. J CHAIN OF CUSTODY R__ECORD AND ANALYSIS REQUEST FORM - - .—1 ...................................................... Analytical Laboratory Services j Analytical Laboratory Use Only �•� DUKE Mail Code MG03A2 (Building 7405) I I Work Order Matrix: NPDES Samples 13339 Hagers Ferry Rd Originating H 11 N C 28078 I From 55 of 55 ---------1 4C_x_ i Page 1 of 2 SC j DISTRIBUTION OHORIGINALto LAB ENERGY ® umersvl e, . . Logged by: (980) 875-5245 Date & Time SAMPLE PROGRAM COPY to CLIENT 980 875-4349 i i ,Zy V Ground Water_ i _Fax: ............ _.. :VbKNPDES Other_ 1)ProjectName 2)PhoneNo: dor Allen Stormwater page 2 Plant I Revised 2-8-17 w j 4)Fax No: 'aPr erv.:1=H L RCRAWaste I E Customer Randy Gantt, Liz Glenn P�Ce �' A 2=HZ oa 3=HN 1.2 E 5)Business Unit: 6)Project ID: PO # 9 11 _ 4=1 a 5=Non 3 7)Mail Code: rn - 4 Field Parameters m E 0 0. 8) Operating Unit: 9)Activity ID: 10)Process ID L) When specific accounting has been established enter that accounitng Ilmportant: above. If specific accounting has not established we can work with just the Operating 1 and Process ID. THANKS! -LAB-USE ONLY••I 12Chem "Lab ID i Deskto No. 13Sam le Description or ID rn i i o SW013-10 SWO13-11 r ill ' 0 I .2 SW013-12 SW013-13 i i o SWO13-14 CL 0. SWO13-15 SW015 �o�.2b�jc a o SWO16 SW018 U SW020 E O I Ij �U I I Hg Dup (1/day or 10%) Hg Field Blank (1/day or 10% ) i Hg Trip Blank(1/ day) Sampler Printed Name: �k �'K.)rOA Date/rime q 1.30 2-: By Customer W complete all appropriate areas. 14COIlection Information Date Time I Signature fJ6 10'U 1). Y6 Jjilr� M. MAa By: fir.... By: s /1?" By: fr /. Daterrime 3/15 T ac )) V a) �p T L L CD d U o w m 2 a w 0- co 2 d U) 22Requested Turnaround 14 Days /oe C I I •48Hr r Add. Cost Will Apply Action Plan: Tier III Benchmark Exceedances Belmont, NC 0 0 October 31, 2022 Mr. Randy Gantt Duke Energy — Allen Steam Station 253 Plant Allen Road Belmont, NC 28012 Subject: Allen Steam Station • Tier I and Tier III Exceedances Dear Randy: L'7 Cardno now ® Stantec Cardno 534 Industrial Park Rd Bluefield, VA 24605-9364 USA Phone: +1 304 809-0629 www.cardno.com www.stantec.com As requested, please review a discussion of the findings based on our October 27, 2022 site investigation conducted with Mr. Kenneth McKenny. SW010 Outfall SWO10 exceeded the benchmark standard for copper and selenium based on September 30, 2022 stormwater sample collection. SWO10 was previously in Tier III for copper. This event marks the first exceedance of Selenium resulting in elevation to Tier I status. During the investigation it was noted that the drop inlet filters, and shell media previously installed in the surface ditch lines / downgradient drop inlets were in good order. It was also noted that TSS was not a factor in this latest sampling event as in previous exceedances, indicating that BMPs in the downgradient area are working. Tracing the piping network upgradient resulted in discovery of a drop -inlet in the alleyway between the railroad tracks and powerhouse. A maintenance conveyor was setup to discharge into this alleyway proximal to the drop - inlet. This conveyor appeared to be used for cleaning of coal and debris at the base of the powerhouse stacks. This material has been and is being tracked throughout the alleyway (Photos 1-3). It is believed this tracking may have impacted the drop -inlet resulting in elevated concentrations of copper and selenium in stormwater discharge. A sediment sample from this drop -inlet was collected on October 27, 2022 for analysis of copper and selenium. Results of analysis are in -process. Only a few known stormwater drop inlets are present in the powerhouse alleyway. Most precipitation in the area is directed to the coal yard sumps via an extensive network of drop -inlets. It is recommended that a smoke test be conducted to locate all drop -inlets connected to SWO10 west of the railroad tracks. Factoring in the crown of the road and presence of sufficient drop -inlets in the powerhouse area routing precipitation to the coal yard sump, it may be feasible to eliminate stormwater drop inlets on the west side (upgradient) of the railroad tracks. This would eliminate a potential source of stormwater contamination from impacting the stormwater basin. Sediment buildup has been trapped by oyster shell media placed in a drop -inlet near the discharge of SWO10. Sediment building is occurring on the west (upgradient) side of the shell media as illustrated in Photo 4. So far, the shell media has managed to capture most of the sediment (Photo 5, downstream piping); however, the media is likely being fouled and the piping should be flushed to reduce the chance of a future TSS exceedance. LI7 Ca/'d/7o Duke Energy —Allen Steam Station October 31. 2022 2 SWO16 now (3 Stantec Outfall SWO16 exceeded the benchmark standard for copper and TSS following September 30, 2022 stormwater sample collection. This exceedance is likely related to ongoing upgradient operations, specifically tracking of soil across Plant Allen Road (Photos 6 and 7). Soil was identified in the concrete ditches (Photos 8 - 10) and fouling rip - rap lined ditches (Photos 11-13). Additionally, sediment is being derived from distribution / transmission tower upgrades (Photos 14 - 17). This condition has been ongoing and concurrent with sediment inputs from tracking across Plant Allen Road. It is recommended that housekeeping practices be immediately undertaken to limit sediment inputs. Gravel crossing needs to be maintained and the roadway crossing should remain free of sediment. Washing of sediment from the roadway to the ditches is strongly discouraged. Either a pickup broom should be used to collect sediment or a crossing structure installed to catch sediment and divert it to the construction basin and away from SWO16. Concrete ditches also need to be consistently maintained and sediment free. Denuded ground from transmission / distribution tower upgrades also needs to be stabilized. Erosion and sediment control measure consisting of silt fence and filter socks should also be properly applied until groundcover is established. Riprap ditches are currently fouled with sediment. These areas could be relined with geotextile and fresh rock. Alternatively, a small retention basin with a flocculant component could be installed to catch sediment as it flushes through the basin before it reaches the stormwater sample point and canal. The conveyance pipe discharging stormwater to the canal is also undermined and potentially deteriorated (Photo 18-19). A void is present at the inlet of the pipe extending below -grade greater than 1-foot and laterally an undermined distance. This void is likely undermining the pipe. The bottom (belly) of the pipe may also be degraded, allowing water being conveyed to mix with underlying soil media, increasing both turbidity and undermining the piping further. It is recommended that the piping void be grouted to ensure flow is transmitted through stormwater piping. A survey of the piping should also be conducted to confirm pipe integrity. 3 Recommendations Cardno recommends that action be taken to address the aforementioned topics to mitigate impacts to stormwater discharge. Increased scrutiny will likely be on the station with the renewal of the ISW Permit. Cardno will be glad to assist with these efforts at your request. Respectfully, oshua Sexton Senior Geologist for Cardno Direct Line +1 304 809 0670 Email: Joshua. Sexton (a cardno.com C,'7 Caircl"40 Cardno Field Notes: Staff: J. Sexton Date / Time: October 27, 2022 10:55 AM Location: 35.18999884999489,-81.0081013521948 Observation: SW010 drop inlet sediment sample collected from alley near facility. Photo 1 Photo 2 .%M -O-P-° r Photo 3 G'7 CeAref"o Cardno Field Notes: Staff: J. Sexton Date / Time: October 27, 2022 9:45 AM Location: 35.18994080387281,-81.00768627712556 Observation: SW010 upgradient buildup of sediment to the west and downgradient to discharge at river. Photo 4 i Photo 5 G'7 cavc/na Cardno Field Notes: Staff: J. Sexton Date / Time: October 27, 2022 8:37 AM Location: 35.18728544082313,-81.01389783327292 Observation: Plant Allen road crossing. Sediment entering SW016 basin from hauling activities. Construction crossing not maintained with gravel. Photo 6 Photo 7 �r f q Z IitaI11■ #1Ad0101a _ ' 5 °� �� J � °'� � are.. t+ g+-• �. ,. a 3 r AAI itti .M1 r V` L r ti CFO) Caircl"40 Cardno Field Notes: Staff: J. Sexton Date / Time: October 27, 2022 8:40 AM Location: 35.18723359052008,-81.0147020615989 Observation: Upper SW016 basin trans/distribution lines construction. Photo 14 Photo 15 G'7 Cardno Cardno Field Notes: Staff: J. Sexton Date / Time: October 27, 2022 9:11 AM Location: 35.188790026148496, -81.01219366040158 Observation: Construction of transmission / distribution lines lower in basin. Photo 16 A IL -A2b%---= Photo 17 <,,'7 Cevclno Cardno Field Notes: Staff: J. Sexton Date / Time: October 27, 2022 9:18 AM Location: 35.18931079808275,-81.01260812890709 Observation: Void before pipe greater than 1' deep, extends greater than 2' under pipe Photo 18 Photo 19 Action Plan: Tier III Benchmark Exceedances Belmont, NC <.:� Cardna® Best Management Practices Allen Steam Station Table of Contents 1 Best Management Practices Summary...........................................................................1 1.1 Coal Pile Management........................................................................................................ 1 1.2 Fugitive Dust Emissions...................................................................................................... 1 1.3 Fuel Oil Unloading / Chemical Loading and Unloading / Miscellaneous Loading and Unloading................................................................................................................... 1.4 Liquid Storage Tanks / Large Bulk Fuel Storage / Above Ground Tanks .................. 1.5 Oil Bearing Equipment Switchyards........................................................................... 1.6 Residue Hauling Vehicles / Ash Loading Areas......................................................... 1.7 Vehicle and Equipment Maintenance......................................................................... 1.8 Material Storage Areas............................................................................................... 1.9 Fueling Operations..................................................................................................... Appendices Appendix A — Industrial Stormwater Fact Sheet Appendix B — Outfall Narrative Descriptions 1 2 2 2 2 3 3 October 2019 Cardno Table of Contents i Allen Steam Station - BMP 20191028 Best Management Practices Allen Steam Station 1 Best Management Practices Summary A number of best management practices (BMPs) are currently in place at the station. These BMPs were instituted over a number of years as a result of various regulatory drivers and good housekeeping objectives. While a chosen practice provides some level of pollution prevention as it relates to the management of stormwater discharges under this permit, the historic rationale behind implementing such a practice is comprehensive of a number of contributing factors. The ongoing implementation of these practices are part of the Stormwater Pollution Prevention Plan (SPPP). Table 2 from the Industrial Stormwater Fact Sheet for Steam Electric Power Generating Facilities (EPA-833-F-06-030) was reviewed and evaluated (provided in Appendix A) for planning of a BMP strategy. A high-level review of these BMPs is provided below along with a rationale for implementing them. The detailed listing of these BMPs for each drainage area is provided in the outfall descriptions (Appendix B) where information regarding the industrial activities and significant sources of pollutants are also compiled. The compiled information in the appendix captures an ongoing assessment process for BMP selection and implementation. The Site Environmental Coordinator shall rely on Table 2 from EPA-833-F-06-030 for the improvement, installation and implementation of BMPs to address data collected through monitoring of stormwater discharges. The Site Environmental Coordinator may also rely on other sources of information to implement other appropriate BMPs not listed in Table 2. This list of BMPs shall be reviewed and updated annually as new practices are incorporated in the plan or warranted as a result of exceedances of analytical monitoring benchmarks. 1.1 Coal Pile Management Rainfall and upland stormwater may be contaminated as it is exposed to the coal pile if not managed properly. The coal pile at the station is bermed on all sides limiting the potential for run-on and directing coal pile runoff to the coal yard sump that are directed to the Lined Retention Basin. 1.2 Fugitive Dust Emissions The potential for fugitive dust to move off -site or into drainage areas with no stormwater or sump controls drives the need for emission management practices. The station maintains an air permit with NCDEQ that includes the control of fugitive dust emissions as a programmatic requirement. Fugitive dust emissions originating from a variety of sources are to be maintained to the Best Available Control Technology emission limits for Particulate Matter with Nominal Aerodynamic Diameter of 10 Mircometers or Less (PM10). Fugitive dust emissions are managed through a variety of practices including negative pressure conditions during raw material unloading, watering of fine particulate materials prior to transport, periodic wetting of haul roads, paving of heavily used gravel surfaces, tire and vehicle wash stations, and wetting of placed landfill material. Contractors may be assigned at any time to perform services that generate fugitive dust related to hauling or construction. As a result, fugitive dust control is typically a contractual requirement of all contracted work. 1.3 Fuel Oil Unloading / Chemical Loading and Unloading / Miscellaneous Loading and Unloading The station maintains numerous locations for the loading and unloading of oil and non -oil liquids and chemicals. The potential for spills and leaks to release to storm drains or overland drainage pathways to receiving waters presents a source for an unauthorized discharge and contamination of stormwater discharges. Loading/unloading operations follow typical spill prevention and control practices and adhere to the Department of Transportation's unloading/loading procedures (49 CFR Part 177, Subpart B). Additional BMPs include training, attendance of a qualified individual during transfer, use of tank level indicators, maintenance of spill kit resources nearby, and the use of transfer containment devices. For number of these transfers, an oil/water separator or yard drainage system with a sump is located down gradient to capture spills and leaks for clean-up and prevent them from being discharged directly to October 2019 Cardno Best Management Practices Summary 1 Allen Steam Station - BMP 20191028 Best Management Practices Allen Steam Station receiving waters. Operators make daily rounds to check containments and note on checklist housed in SPCC plan. Accumulated stormwater is inspected before being discharged 1.4 Liquid Storage Tanks / Large Bulk Fuel Storage / Above Ground Tanks The station maintains numerous storage tanks for oil and non -oil liquids and chemicals. The potential for spills and leaks to release to storm drains or overland drainage pathways to receiving waters exists and presents a source for an unauthorized discharge and contamination of stormwater discharges. The station relies on a variety of practices to reduce exposure of leak and spills to stormwater discharges. They include the use of valve controlled and secured secondary containment systems, secured perimeters and barriers to prevent accidental damage and vandalism to tanks, level indicators and gauges to detect leaks, lighting, routine disposal schedules, readily available spill kits and materials, and active SPCC plan development, implementation, and training. For a number of these tanks, a yard drainage system with a sump is located down gradient to capture spills and leaks for clean-up and prevent them from being discharged directly to receiving waters. Operators make daily rounds to check containments and note on checklist housed in SPCC plan. Accumulated stormwater is inspected before being discharged 1.5 Oil Bearing Equipment Switchyards There are two switchyards at the station near the powerhouse and numerous oil bearing equipment (e.g., transformers) located at various places throughout the station to support operations. The potential for spills and leaks to release to storm drains or overland drainage pathways to receiving waters exists and presents a source for an unauthorized discharge and contamination of stormwater discharges. The station relies on the use of secondary containments around transformers and oil/water separators downgradient of switchyards to intercept significant spills. These containments are inspected daily and noted on checklist housed in SPCC plan. Accumulated stormwater is inspected before being discharged. In addition, the switchyards are covered with gravel surfaces and lined with perimeter ditching to reduce the conveyance of spills and provide for areas of collection. Both switchyards are located within yard drainage areas with sumps that discharge ultimately to the Lined Retention Basin. 1.6 Residue Hauling Vehicles / Ash Loading Areas Fly ash stored in covered silos is loaded into dump trucks and transported to the lined CCP landfill. Gypsum is loaded into dump trucks and transported off -site. Dry bottom ash is moved by a submerged conveyor system from the boilers to the Dry Bottom Ash Handling Area where it is processed and transported by dump trucks to the lined CCP landfill. CCR materials have the potential to spill from trucks or be carried away as dust, thereby contaminating surfaces that may be later exposed to stormwater runoff. The materials are wetted prior to loading to prevent dust emissions and truck coverings are used for hauling off -site where material may dry in transit. Loading areas are regularly washed down with wash water and drained to a settling basin prior to discharging through the sump system and ultimately to the Lined Retention Basin. The discharges from these loading areas are located within the yard drainage system that convey runoff and wash water to the Lined Retention Basin. This keeps loading areas free from dust generation. Truck wheel wash stations are located in loading and unloading areas and used to limit the transport of residue to haul roads. 1.7 Vehicle and Equipment Maintenance Vehicles and equipment have the potential to leak or spill significant quantities of fuel, hydraulic fluids, and oils if not properly maintained and operated. There is potential for unauthorized discharges as the vehicles and equipment operate near storm drains. Maintenance is performed on a routine basis to keep vehicles and equipment operational, thereby reducing the potential for spills and leaks from mechanical failure. To the extent practicable, maintenance is performed off -site at commercial facilities that are subject to local laws and regulations regarding the disposal of used materials. When maintenance must be performed on -site, it is performed under cover and with temporary containment devices used to capture emptying of fluids. Used materials and parts are labeled and properly disposed of in original containers or secured packaging. Where spills or leaks do occur, spill kits are readily available for use. October 2019 Cardno Best Management Practices Summary 2 Allen Steam Station - BMP 20191028 Best Management Practices Allen Steam Station Operators make daily rounds to check containments and note on checklist housed in SPCC plan. Accumulated stormwater is inspected before being discharged 1.8 Material Storage Areas Limestone, coal, fly ash, and gypsum are the bulk materials stored at the station. Exposure of the materials to rainfall and stormwater run-on has the potential to contaminate stormwater runoff. All materials except fly ash are stored outdoors in piles that are bermed to prevent run-on or contained to drain to detention basins and/or sumps and subsequently to the Lined Retention Basin. 1.9 Fueling Operations Fueling is performed in two distinct ways that has the potential to contribute to significant quantities of pollutants. Lighter, all purpose vehicles and equipment such as cars and trucks are fueled from a stationary dispenser while heavier, dedicated equipment, such as earth moving equipment, are fueled by mobile dispensers in the areas where they are used. The potential for spills and leaks to release to storm drains or overland drainage pathways to receiving waters presents a source for an unauthorized discharge and contamination of stormwater discharges. For the stationary fueling operations, the dispensary equipment is checked regularly for leaks and functional operation. Spill kits are located nearby for minor spills and leaks during fueling. Mobile fueling operations are handled in the same way, but typically a temporary containment is set up to capture leaks and spills. Operators make daily rounds to check containments and note on checklist housed in SPCC plan. Accumulated stormwater is inspected before being discharged. Mobile fueling operations are mostly performed in areas with yard drainage and sumps or leachate collection systems so ultimately they discharge to the Lined Retention Basin. October 2019 Cardno Best Management Practices Summary 3 Allen Steam Station - BMP 20191028 DUKE . " ENERGY:: Location: Allen Steam Station Outfall Narrative Description and BMP Summary Permit No. NCS000546 Outfall ID SW010 Drainage Area 0.7 acre Discharge Structure 12-inch-diameter CMP Percent Impervious 0% Location Located south of station's Permit Monitoring 1 intake structure Table Latitude - Longitude 35011'23"N - 81 000'27"W Industrial Activities and The drainage area for SW010 is comprised of rail lines immediately east of the Description Powerhouse and a grassed embankment located between the rail lines and the intake structure. The area contains approximately 1,280 linear feet of rail lines. Significant Coal and Limestone: Train cars carrying coal and limestone use the rail Materials/Potential lines that pass through this drainage area. Pollutants BMP Summary Fugitive Dust Emissions • Establish procedures to minimize off -site tracking of coal dust. Delivery Vehicles • Develop procedure for the inspection of all vehicles arriving on the plant site and ensure overall integrity of the body or container. Notes: 1. Outfall fact sheet provides documentation for permit sections for narrative description of potential pollutants (Part II, Section A, 1.(b)) and BMP Summary (Part II, Section A, 2.(c)). r7 DUKE ENERGY. Location: Allen Steam Station Outfall Narrative Description and BMP Summary Permit No. NCS000546 Outfall ID SW016 Drainage Area 21.8 acres Discharge Structure 36-inch-diameter CMP Percent Impervious 2% Location Located at the discharge Permit Monitoring 1 canal on south bank Table Latitude - Longitude 35°11'22"N - 81°00'44"W Industrial Activities and The drainage area for SW016 encompasses primarily vegetated upland areas Description along the site access road south of the discharge canal. The drainage area includes approximately 1,700 feet of the site paved access road, and approximately 1,000 linear feet of the paved ash haul road. Ash haul trucks use the ash haul road to transport ash from the dry ash handling facility to the ash landfill. The drainage area also includes an additional 700 linear feet of paved road south of the access road, approximately 1,000 linear feet of dirt roads north of the access road, and a gravel -surfaced laydown and equipment parking area north of the access road. Significant Ash: Fly ash is transported in ash haul trucks that use the ash haul road. Materials/Potential Pollutants Inert Materials: Various quantities of structural steel, cable, truck trailers, and other inert materials may be stored on the gravel laydown yard area at various times. BMP Summary Fugitive Dust Emissions • Establish procedures to minimize off -site tracking of fly ash, such vehicle washing or automated wash stations. Residue Hauling Vehicles • Inspect all residue hauling vehicles for proper covering over the load, adequate gate sealing, and overall integrity of the body or container. Materials Storage Areas • Cover material with a temporary covering made of water resistant material Notes: 1. Outfall fact sheet provides documentation for permit sections for narrative description of potential pollutants (Part II, Section A, 1.(b)) and BMP Summary (Part II, Section A, 2.(c)).