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WHIRLWIND MINE,PERMIT NO. M-2007-044 <br /> FIRST QUARTER 2021 HYDROLOGICAL REPORT <br /> Attachment 6.Monitoring Well W-1 - <br /> Dissolved Specific Oxygen- <br /> Monitoring Sampled Water Level Field pH Temperature Oxygen(mg/L Conductance Reduction <br /> Date Y/N ft BTOC S.U. (deg.C or% (US/CM) Potential mV Comments <br /> 12/14/2018 No 74.69 5.99 11.01 NM 1366 293 <br /> Q1 2019 No NM NM NM NM NM NM Inaccessible due to county road conditions. <br /> 6/25/2019 Yes 74.59 7.53 11.04 7.0 1265 176.6 <br /> 9/13/2019 No 74.70 7.03 11.20 2.6 1376 215 <br /> 11/8/2019 No 74.80 7.61 11.93 2.1 1475 261 <br /> 3/27/2020 No 74.70 7.25 10.06 2.7 1350 115 <br /> 6/24/2020 Yes 74.88 7.63 11.12 3.7 1310 -250 <br /> 9/11/2020 No 1 75.02 1 7.72 1 10.49 7.1 1380 54 <br /> 11/6/2020 No 74.83 6.93 11.55 2.2 1610 143 <br /> Q1 2021 No NM NM NM NM NM NM Inaccessible due to county road conditions. <br /> NM=Not Measured <br />