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WHIRLWIND MINE, PERMIT NO.M-2007-044 <br /> FIRST QUARTER 2025 HYDROLOGICAL REPORT <br /> Attachment 4.DP Spring <br /> Monitoring Sampled Inflow Rate Field pH Temperature Dissolved Specific Oxygen- <br /> Date (Y/N) (gpm) (s.u.) (deg. C) Oxygen Conductance Reduction Comments <br /> (mg/L) (US/cm) Potential(mV) <br /> 9/8/2017 No 4.5 6.93 14.04 8.83 563.6 246 <br /> 10/20/2017 No 4.5 6.25 9.31 8.03 549.0 179.1 <br /> 3/22/2018 No 6.3 7.47 &08 10.31 370.0 46.1 <br /> 6/20/2018 Yes 6.0 7.14 10.25 10.46 384.0 6.9 <br /> 9/7/2018 NO 4.9 7.39 11.06 12.04 375.0 283.9 <br /> 12/14/2018 No 4.5 6.83 6.02 - 557.0 337 <br /> Q1 2019 No NM NM NM NM NM NM Inaccessible due to county road conditions <br /> 6/25/2019 Yes 6.0 7.17 10.05 9.13 550.0 210 <br /> 9/13/2019 No 2.5 7.45 10.82 10.06 541.0 163 <br /> 11/8/2019 No 4.3 7.65 8.59 11.52 563.8 275 <br /> 3/27/2020 No 6.0 7.58 5.49 12.37 558.0 528 <br /> 6/24/2020 Yes 4.0 6.89 10.24 10.82 500.0 196 <br /> 9/11/2020 No 4.5 7.41 10.60 10.65 587.0 286 <br /> 11/6/2020 No 5.0 7.45 8.81 15.70 619.0 89 <br /> Q1 2021 No NM NM NM NM NM NM Inaccessible due to county road conditions <br /> 6/18/2021 No 4.0 7.77 10.74 10.33 594.0 152.4 <br /> 7/13/2021 Yes 4.0 7.61 14.98 10.30 557.7 109.0 <br /> 9/9/2021 No 4.0 6.18 11.49 9.97 618.0 246.9 <br /> 11/9/2021 No 4.6 7.60 9.02 13.88 668.0 67.2 <br /> 3/30/2022 Yes 5.7 7.12 5.80 12.88 565.0 60.6 <br /> 6/23/2022 No 4.0 7.33 10.62 12.11 635.0 233.3 <br /> 8/1/2022 Yes 3.7 6.34 11.60 10.12 558.5 528.0 <br /> 11/16/2022 No 3.6 6.35 7.78 11.24 572.7 519.0 <br /> Q1 2023 No NM NM NM NM NM NM Inaccessible due to county road conditions <br /> 5/10/2023 No 4.6 7.41 8.13 8.51 424.0 3.5 <br /> 7/25/2023 Yes 3.7 7.58 12.54 11.08 541.6 295.0 <br /> 10/31/2023 No 3.5 7.14 6.47 14.42 534.0 43.2 <br /> Q1 2024 No NM NM NM NM NM NM Inaccessible due to county road conditions <br /> 5/1/2024 No 3.8 7.53 6.97 4.51 548.0 33.9 <br /> 9/11/2024 Yes 3.3 7.20 11.50 10.17 542.0 223.5 <br /> 10/30/2024 Yes 3.8 7.54 8.06 10.67 350.0 193.1 <br /> Q1 2025 No NM NM NM NM NM NM Inaccessible due to county road conditions <br /> -ORP Probe broke during 4/18/11 Monitoring Event. <br /> ""-Meter malfunctioned during site visit-no measurements were taken. <br /> NM = Not Measured <br />