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WHIRLWIND MINE, PERMIT NO.M-2007-044 , <br /> SECOND QUARTER 2025 HYDROLOGICAL REPORT <br /> Attachment 5. PR 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 /> 3/22/2018 No 6.0 791 960 11.00 577.0 120 <br /> 6/20/2018 Yes 5.0 7.82 1193 9.64 613.0 -4.7 <br /> 9/7/2018 No 45 7.95 12.68 12.15 588.0 164 <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 6.5 8.03 12.20 6.44 7850 238 <br /> 9/13/2019 No 42 7.88 12.59 9.27 8120 295 <br /> 11/8/2019 No 4.9 8.10 11.14 10.34 802.7 337 <br /> 3/27/2020 No 2.5 8.10 9.19 10.70 773.0 896 <br /> 6/24/2020 Yes 4 5 798 11.49 9.88 754.0 413 <br /> 9/11/2020 No 2.8 8.10 11.65 8.51 883.0 242 <br /> 11/6/2020 No 20 8.25 11 19 8.92 853.0 251 <br /> Q1 2021 No NM NM NM NM NM NM Inaccessible due to county road conditions <br /> 6/18/2021 No 2 0 6.78 12.06 10.48 860.0 176 <br /> 7/13/2021 Yes 5.0 7.58 14.15 9.55 819.0 255 <br /> 9/9/2021 No 50 7.91 12.26 9.25 857.0 253 <br /> 11/9/2021 No 4.5 7.60 902 1388 668.0 67.2 <br /> 3/30/2022 Yes 66 7.87 9.45 13.38 765.0 132.7 <br /> 6/23/2022 No 4.5 8.43 11.07 12.21 8280 235.7 <br /> 8/1/2022 Yes 5.0 7.98 1300 957 827E 4120 <br /> 11/16/2022 Yes 41 6.62 11.46 9.66 888.4 489.0 <br /> Q1 2023 No NM NM NM NM NM NM Inaccessible due to county road conditions <br /> 5/10/2023 Yes 55 812 9.74 9.43 490.0 243 <br /> 7/25/2023 Yes 55 NM 1383 10.17 989.9 213.0 Field pH was not measured. lab pH was reported as 8.1 <br /> 10/31/2023 Yes 1.2 7.62 9.14 12.95 7970 3.2 <br /> Q1 2024 No NM NM NM NM NM NM Inaccessible due to county road conditions <br /> 5/1/2024 Yes 17 6.67 10.18 41.55 812.0 143.9 <br /> 9/11/2024 Yes 1 0 8.03 1171 7.77 805.0 1201 <br /> 10/30/2024 Yes 0.76 8.08 1069 7.62 801.0 1457 <br /> Q1 2025 No NM NM NM NM NM NM Inaccessible due to county road conditions <br /> 5/28/2025 Yes 08 7.94 11.55 12.86 1 817.0 1 49.9 <br /> '-ORP Probe broken during 4/18/11 Monitoring Event. <br /> "'-Meter malfunctioned during site visit-no measurements were taken. <br /> Note: PR Spring not accessible in February or March, 2010 due to deep snow <br /> NM = Not Measured <br />