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WHIRLWIND MINE, PERMIT NO.M-2007-044 <br /> FOURTH QUARTER 2021 HYDROLOGICAL REPORT <br /> Attachment 5. PR Spring <br /> Dissolved Specific Oxygen- <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 /> 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 6.44 785.0 238 <br /> 9/13/2019 No 4.2 7.88 12.59 9.27 812.0 295 <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 7.98 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 2.0 8.25 11.19 8.92 853.0 251 <br /> 012021 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 5.0 7.91 1 12.26 9.25 857.0 253 <br /> 11/9/2021 No 4.5 7.60 9.02 13.88 668.0 67.2 <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 />