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WHIRLWIND MINE,PERMIT NO.M-2007-044 <br /> THIRD QUARTER 2021 HYDROLOGICAL REPORT <br /> Attachment 4.DP Spring <br /> Dissolved pea is xygen- <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 /> 6/7/2017 Yes 6.0 7.17 12.52 5.06 522.7 367 <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 6.08 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 /> *-ORP Probe broke during 4/18/11 Monitoring Event. <br /> ***-Meter malfunctioned during site visit-no measurements were taken. <br /> NM=Not Measured <br />