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► The Tucson South-southwest cell will be filled with fines <br /> ► The Challenger Pit will have a slope liner installed around it <br /> ► The Baseline Mine will be reclaimed as a lake and wetlands <br /> ► The Tucson South-west cell will be surrounded by a slurry wall <br /> To simulate the calibration conditions and above activities,eight scenarios and two sub scenarios were <br /> devised. They are summarized in Table 3. <br /> Scenario 1:Calibration-This is the situation encountered at the site during the investigation for this <br /> project(late 2003-early 2004). The old(existing)Seltzer Well in the proposed Tucson South-west <br /> cells is running and the southern part'of the Rogers pit is being dewatered and mined. Water levels were <br /> measured and used for calibrating the model. <br /> Scenario la: Calibration-This is the situation during the middle of 2004. The southern portion of the <br /> Rogers Pit is not being mined and has filled with water.No other activities have started. This scenario <br /> was run for 90 days to allow comparison of the simulated rise of water levels with those measured in the <br /> monitoring wells. The comparison showed general agreement. <br /> Scenario 2:No Mining-This scenario is identical to la, except that it was allowed to run long enough <br /> to achieve a establish a quasi-equilibrium condition for each season. This scenario simulates hydrologic <br /> conditions in the area while no activities are taking place. <br /> Scenario 3:New Seltzer Well and Existing Conditions Base-This scenario serves as the comparison <br /> base for all subsequent scenarios.The only difference between this scenario and scenario 2 is that the <br /> old Seltzer well has been abandoned and replaced by the new well between the east cell and the South <br /> Platte River. This scenario simulates the situation just prior to mining activities. <br /> Scenario 4:Early Mining-This scenario simulates the first new mining activities in the area. The <br /> southern portion of the Rogers Pit is being dewatered and mined,as is the Challenger Pit. <br /> Scenario 5:East Cell Mining-This scenario simulates the installation of the east cell slurry wall and <br /> dredge mining of the southwest cell. The southern portion of the Rogers Pit has been filled with fines <br /> while the Challenger Pit and Baseline Mine are dewatering and mining. <br /> Scenario 6:West Cell Mining and Post Mining-This scenario simulates the final mining activities in <br /> the area. The slurry will has been extended around the west cell, separating it from the alluvial aquifer. <br /> Mining in the Challenger Pit is complete and the slope liner has been installed. The Baseline Mine and <br /> southwest cell have been backfilled with fines and a part of the Baseline Mine has been turned into an <br /> unlined lake. <br /> Scenario 6max:West Cell Mining and Post Mining-This scenario is identical to Scenario 6,but the <br /> number and output of the new Seltzer Wells has been increased to the maximum decreed output. <br /> Scenario 7:East Cell Mining(Isolated)-This scenario simulates the mining of the east cell and <br /> southwest cell without the influence of the Challenger Pit and Baseline Mine. The purpose of this <br /> scenario is to determine the effects of only the east cell. <br /> -8- August 2004 <br /> 1:%919 019%TS GW ModeRTS RepotlWueson South Rpt Drandoc <br />