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Restoration of pre-mining ground-water flow conditions is expected to result in <br /> increased discharge from springs in the vicinity of Cement Creek (Figure 2). The <br /> additional flow is expected to be mostly diffuse, occurring between the Mogul Mine <br /> and the Silver Ledge Mine. Estimated time of travel for water from the flooded mine <br /> to flow to Cement Creek is approximately 150 years. This estimate is based on travel <br /> time through fractured bedrock with the expected equilibrium water level of <br /> approximately 1 1 ,500 feet msl. However, should the mine workings flood to a higher <br /> equilibrium elevation (12,250 feet msl) an estimated 160 gpm of the mine waters <br /> could reach Cement Creek through the Mogul Mine in approximately four months. <br /> This travel time is based on predominantly open channel flow which would occur in <br /> the idle mine workings of the Mogul Mine at approximately 11 ,400 feet msl elevation. <br /> The ground water in the vicinity of the Sunnyside Mine naturally contains anomalous <br /> levels of metals compared to ground water from non-mineralized areas (Simon Hydro- <br /> Search, 1993). Therefore, when the springs return to their natural flow rates (after <br /> equilibrium water levels are reached behind the proposed bulkheads in the Sunnyside <br /> Mine), the springs are expected to reflect a water chemistry typical of a mineralized <br /> area. The Colorado Mined Lands Division wants to be able to differentiate natural <br /> water chemistry from the chemistry of waters which have passed through the <br /> Sunnyside Mine. Therefore, they have proposed that a tracer be placed in the mine <br /> workings so that waters which have passed through the mine can be identified as <br /> such. <br /> sunny\wp\traci\2251\Workplan.693 4 <br /> NNl SImOD HYDRO-SEARCH <br />