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RECOMMENDATIONS <br /> ■ Develop a system where water levels will be limited to acceptable levels. This could <br /> include a pressure relief valve at the bulkhead pipes that discharges into an acceptable <br /> location. <br /> ■ Monitor water levels in both the Times Well and Wynona Shaft well regularly. Consider <br /> installing a pressure transducer and datalogger if site will be unmanned for longer <br /> periods. <br /> ■ Install a stainless-steel fluid filled pressure gauge (0-50 psi range) on the bulkhead pipes. <br /> It should be installed on a tee between two valves and include a sampling/air bleed port. <br /> ■ While we generally recommend removing the bulkhead forms to better observe and <br /> assess the condition of the concrete,we do not suggest doing that on this site due to the <br /> high risk of damaging the PVC pipes. <br /> ■ Investigate elevation of Wynona 100 Level to evaluate its effect on storage behind the <br /> Times Mine bulkhead. If the level is higher than the Times Mine, it could drain out <br /> through the bulkhead. If the level is lower, it would be dead storage. A potential method <br /> would be to pump the Wynona Shaft at various elevations. A quick drop in water level <br /> would show it to be only shaft volume. A slow drop would indicate a connection to a <br /> mine pool. <br /> ■ While the PVC pipes and valves are not susceptible to corrosion, they are brittle and can <br /> crack. Consider sleeving the pipes with stainless steel and replacing the PVC valves with <br /> stainless steel. This should be done when there is no water behind the bulkhead. <br /> ■ Remove the stuck pump from the Wynona Shaft and survey the top of casing to allow <br /> regular and accurate water level readings. <br /> ■ Develop a plan to draw down the water in the mine. <br /> ■ Monitor water quality/chemistry to evaluate potential concrete degradation <br /> LIMITATIONS <br /> Deere& Ault Consultants Inc. work on this project is limited to the analysis described in this <br /> report. Specifically, our services do not include the evaluation of any outstanding adequacy <br /> review issues other than those addressed herein. <br /> - 7 - <br />