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Home My WebLink AboutDAQ-2024-011336Kennecott Utah Copper, LLC Kennecott Tailings & Water Services 4700 Daybreak Parkway South Jordan, Utah 84009 USA T 801-204-3051 F 801-569-7217 Paula Doughty Manager, Hydro, Tailings and Water Services Mr. Bryce Bird, Director Department of Environmental Quality Division of Air Quality P.O. Box 144820 Salt Lake City, Utah 84114-4820 October 30th, 2024 Subject: Approval Order (AO) DAQE-AN0572018-06 Kennecott Tailings Quarterly Report Third Quarter 2024 Dear Mr. Bird: In compliance with Kennecott Utah Copper (KUC) Approval Order (AO) DAQE-AN0572018-06, dated April 6, 2006, attached is the Tailings Quarterly Report for the Third quarter of 2024. • All monitoring and record-keeping requirements were met during the reporting period. • 0 acres were seeded during the reporting period. • Polymer or chemical dust suppressant was applied to a total of 495 acres during the reporting period; See Control Measures table for suppressant and polymer application acres. • The 95% minimum wetness criterion was met as determined during grid inspections conducted during the Third quarter of 2024. Refer to the attached surface wetness table. • KUC continued to monitor weather conditions during the reporting period. Criteria for wind speeds were experienced on three (3) days during the quarter. August 11, 2024 August 22, 2024 August 23, 2024 Based on information and beliefs formed after reasonable inquiry, the statements and information in this document are true, accurate, and complete (R307-415-5d). Docusign Envelope ID: 2E9F8320-FCAA-4495-BA81-08F489B9A300 Should you have questions or need further information regarding this report, please feel free to contact me or Will Chamberlain at 385-695-0266. Sincerely, Paula H. Doughty Manager, Hydro, Tailings and Water Services Attachments Docusign Envelope ID: 2E9F8320-FCAA-4495-BA81-08F489B9A300 KENNECOTT UTAH COPPER – TAILINGS QUARTERLY REPORT 3rd Quarter Report – 2024 This report reviews dust control activities for the reduction of fugitive dust at the Kennecott Utah Copper Tailings Site and fulfils reporting requirements as outlined in the Approval Order (AO) for this facility. Control Measures Area Drill Seeding & Fertilizer (acres) Hydro-seeding (acres) Redrill (acres) Total seeding (acres) MCl, Pine Tar, Hy- Mulch, M-binder & Polymer Control (acres) North 0 0 0 0 463 South 0 0 0 0 32 The acreage listed above is displayed on the attached maps as required in the Approval Order (AO). No acres on the site were treated with lime and biosolids to enhance vegetative growth. Supplemental Dust Controls In addition to the dust control methods outlined above, road watering was conducted as conditions warranted. Automatic high-pressure sprinklers were also used on inactive construction cells in the north area. Dike Interior Dust Control The operational program of rotating tailings distribution from the peripheral discharge system continued during the quarter in the north area. Tailings distribution has been discontinued in the south area due to reclamation activities. Criteria For Wind Reporting During the third quarter of 2024, KUC continued to monitor meteorological conditions. There were seven (3) days during the period when the criteria for wind reporting was met. The Approval Order (AO) combines the north expansion with the south area and defines criteria for winds greater than 25 mph for greater than one hour from any direction during which no precipitation occurred. The analyses of tailings impoundment surface wetness for the third quarter of 2024 are detailed in the following table: Docusign Envelope ID: 2E9F8320-FCAA-4495-BA81-08F489B9A300 WETNESS CATEGORY (%) Date Deep Water Shallow Water Saturated Wet, Unsaturated Treated/ Crusted All Dry 2024.07.16 27% 7% 43% 19% 0% 4% 2024.08.14 2024.09.25 28% 33% 18% 26% 46% 33% 7% 5% 0% 0% 0% 3% The observed tailings pond surface dryness is below the maximum allowable surface dryness of 5%. Docusign Envelope ID: 2E9F8320-FCAA-4495-BA81-08F489B9A300 Date:August 11, 2024 Wind Speed Wind Direction MST Hour mph (1 hr avg)deg (1 hr unit vector) 00 - 01:00 10.6 295.9 01 - 02:00 11.5 280.3 02 - 03:00 10.6 276.9 03 - 04:00 5.6 314.0 04 - 05:00 4.9 157.6 05 - 06:00 5.1 125.7 06 - 07:00 2.9 75.4 07 - 08:00 3.4 202.1 08 - 09:00 5.3 134.0 09 - 10:00 8.1 255.7 10 - 11:00 8.1 310.3 11 - 12:00 7.7 316.7 12 - 13:00 5.8 333.9 13 - 14:00 6.5 343.5 14 - 15:00 9.4 302.3 15 - 16:00 8.2 320.9 16 - 17:00 7.2 4.5 17 - 18:00 6.7 21.9 18 - 19:00 7.0 51.8 19 - 20:00 7.9 115.6 20 - 21:00 22.8 159.7 21 - 22:00 21.2 160.0 22 - 23:00 27.2 163.8 23 - 24:00 20.8 163.2 Hrs ≥ 25 mph:1 Daily Avg:9.8 Max Wind & Corresponding Direction: 27.2 163.8 Center Tailings Kennecott Utah Copper Daily Wind Report Based on Hour Averages Tailings Impoundment Station Docusign Envelope ID: 2E9F8320-FCAA-4495-BA81-08F489B9A300 Date:August 22, 2024 Wind Speed Wind Direction MST Hour mph (1 hr avg)deg (1 hr unit vector) 00 - 01:00 8.1 122.1 01 - 02:00 5.7 128.6 02 - 03:00 6.5 147.3 03 - 04:00 3.5 186.5 04 - 05:00 2.4 239.6 05 - 06:00 13.4 164.3 06 - 07:00 19.1 148.7 07 - 08:00 13.9 162.8 08 - 09:00 23.8 157.0 09 - 10:00 25.1 153.9 10 - 11:00 23.0 161.6 11 - 12:00 18.9 143.6 12 - 13:00 21.9 136.0 13 - 14:00 24.2 142.9 14 - 15:00 22.7 149.9 15 - 16:00 21.9 155.7 16 - 17:00 20.1 155.7 17 - 18:00 18.7 154.4 18 - 19:00 16.7 162.2 19 - 20:00 13.0 168.5 20 - 21:00 16.2 164.6 21 - 22:00 18.6 167.7 22 - 23:00 17.4 161.6 23 - 24:00 21.3 163.7 Hrs ≥ 25 mph:1 Daily Avg:16.5 Max Wind & Corresponding Direction: 25.1 153.9 Center Tailings Kennecott Utah Copper Daily Wind Report Based on Hour Averages Tailings Impoundment Station Docusign Envelope ID: 2E9F8320-FCAA-4495-BA81-08F489B9A300 Date:August 23, 2024 Wind Speed Wind Direction MST Hour mph (1 hr avg)deg (1 hr unit vector) 00 - 01:00 20.0 161.8 01 - 02:00 20.6 154.1 02 - 03:00 20.4 166.7 03 - 04:00 18.8 164.8 04 - 05:00 17.7 166.9 05 - 06:00 20.5 166.1 06 - 07:00 19.8 165.2 07 - 08:00 20.6 159.5 08 - 09:00 23.0 153.0 09 - 10:00 25.1 156.0 10 - 11:00 27.4 154.6 11 - 12:00 26.5 147.8 12 - 13:00 25.0 152.0 13 - 14:00 21.6 146.4 14 - 15:00 22.5 149.9 15 - 16:00 16.1 195.5 16 - 17:00 15.6 197.4 17 - 18:00 14.3 187.0 18 - 19:00 13.6 176.4 19 - 20:00 10.7 165.2 20 - 21:00 11.4 162.6 21 - 22:00 11.8 169.8 22 - 23:00 10.6 130.1 23 - 24:00 11.7 153.6 Hrs ≥ 25 mph:4 Daily Avg:18.6 Max Wind & Corresponding Direction: 27.4 154.6 Center Tailings Kennecott Utah Copper Daily Wind Report Based on Hour Averages Tailings Impoundment Station Docusign Envelope ID: 2E9F8320-FCAA-4495-BA81-08F489B9A300 Kennecott North TailingsSurvey Department NORTH AMENDMENTS NTS 2024 SOILS 0 THIRD QTR. POLYMER 2024 STEVE HUNTER 2024 PROJECTS Docusign Envelope ID: 2E9F8320-FCAA-4495-BA81-08F489B9A300 Docusign Envelope ID: 2E9F8320-FCAA-4495-BA81-08F489B9A300