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following field monitoring activities were not performed during the first quarter of 2023 (January <br /> through March 2022)at the Mine due to impassable roads: <br /> • Quarterly water level/flow measurements and field parameters at the monitoring well, DP <br /> Spring and PR Spring; <br /> • Analytical sampling for PR Spring and MW-1 <br /> Whirlwind Mine Treatment Plant <br /> Discharge of treated water from the Mine is allowed in accordance with the Colorado Wastewater <br /> Discharge Permit System, Permit No. CO-0047562. EFRI has suspended use of the Mine water <br /> treatment plant until such time that dewatering operations resume. No water has been pumped <br /> from the Mine since December 2009,and Mine water has been allowed to accumulate in the Mine <br /> workings. As noted in EFRI's May 19, 2022 notice to DRMS, final engineering designs are now <br /> in progress with fabrication and delivery of new water treatment equipment expected in 2023,with <br /> dewatering commencing in mid to late 2023. Refer to Appendix 1,Attachment 1 of this report for <br /> a summary of mine water treatment. <br /> Whirlwind Mine and Packrat Mine <br /> The inflow within the Mine decline cannot be measured directly because it occurs over <br /> approximately 100 feet from the entrance of the decline and within the drifts. The water collects <br /> in the mine sump and is subsequently pumped to the surface when the Mine is dewatering. When <br /> the Mine is not being dewatered, the groundwater inflow can be calculated based on the <br /> approximate elevation level of accumulated mine water, and the void volume of the workings. <br /> Access to the Mine decline was restricted during the third quarter of 2012. As a result, flow rate <br /> and field parameter measurements were also put on hold until such time that dewatering is <br /> resumed, and the mine pool becomes accessible after the completion of the decline rehabilitation. <br /> Historical flow rates and field parameters from the Mine decline water are included in Appendix <br /> 1, Attachment 2. Analytical data from the previous samples collected from the Mine are <br /> summarized in Appendix 2, Table 1. <br /> Characterization of mine water in the Packrat Mine could not be conducted, because the mine is <br /> not yet accessible. Appendix 1,Attachment 3 of this report is reserved for field data collected from <br /> the Packrat Mine at such time that it becomes accessible and is monitored. <br /> DP Spring <br /> The field parameters were unable to be measured during first quarter due to impassable roads. The <br /> flow is measured by timing the fill rate of a five-gallon bucket. Field parameters from DP Spring <br /> are measured in the stock tank located at the spring. Flow rates and field parameters at DP Spring <br /> are summarized in Appendix 1,Attachment 4. <br /> 2 <br />