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WHIRLWIND MINE,PERMIT NO.M-2007-044 <br /> SECOND QUARTER 2023 HYDROLOGICAL REPORT <br /> Attachment 4.DP Spring <br /> uissolvea SpecnicOxygen- <br /> Monitoring Sampled Inflow Rate Field pH Temperature Oxygen Conductance Reduction <br /> Date (Y/N) (gpm) (s.u.) (deg.C) (mg/L) (US/cm) Potential(mV) Comments <br /> 9/8/2017 No 45 693 14.04 883 563.6 246 <br /> 10/20/2017 No 4.5 625 9.31 803 5490 179.1 <br /> 3/22/2018 No 6.3 747 608 10.31 3700 46.1 <br /> 6/20/2018 Yes 6.0 7.14 10.25 10.46 384.0 69 <br /> 9/7/2018 NO 4.9 7.39 1106 12.04 375.0 283.9 <br /> 12/14/2018 No 4.5 6.83 602 *** 557.0 337 <br /> Q1 2019 No NM NM NM NM NM NM Inaccessible due to county road conditions <br /> 6/25/2019 Yes 60 7.17 10.05 913 550.0 210 <br /> 9/13/2019 No 2.5 745 1082 1006 541.0 163 <br /> 11/8/2019 No 4.3 765 859 11.52 5638 275 <br /> 3/27/2020 No 6.0 7.58 5.49 12.37 5580 528 <br /> 6/24/2020 Yes 4.0 689 10.24 10.82 5000 196 <br /> 9/11/2020 No 4.5 741 1060 1065 587.0 286 <br /> 11/6/2020 No 5.0 7.45 881 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 40 777 1074 10.33 594.0 152.4 <br /> 7/13/2021 Yes 4.0 7.61 14.98 1030 5577 1090 <br /> 9/9/2021 No 4.0 618 11.49 997 618.0 2469 <br /> 11/9/2021 No 46 760 9.02 1388 668.0 672 <br /> 3/30/2022 Yes 57 7.12 5.80 1288 5650 606 <br /> 6/23/2022 No 40 7.33 10.62 12 11 6350 233.3 <br /> 8/1/2022 Yes 3.7 634 1160 10.12 5585 528.0 <br /> 11/16/2022 No 3.6 635 778 11.24 5727 5190 <br /> Q1 2023 No NM NM NM NM NM NM Inaccessible due to county road conditions <br /> 5/10/2023 No 46 741 8.13 8.51 424.0 35 <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 />