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Scenario 8:West Cell Mining and Post Mining(Isolated)-This scenario simulates the mining of all <br /> of Tucson South without the influence of the Challenger Pit and Baseline Mine. The purpose of this <br /> scenario is to determine the effects of only this proposed mine. <br /> Table 3: Summary of Scenarios <br /> Status of Variables For Each Scenario <br /> Variable 1 la 2 3 4 <br /> Old Seltzer Well on on on off off <br /> New Seltzer Well off off off on on <br /> Greenhouse Wells on on on on on <br /> Rogers Unlined Cell dewater lake lake lake dewater <br /> Challenger Pit - - - - dewater <br /> Tucson South: East Cell <br /> Tucson South: West Cell - - - - - <br /> Tucson South: SW Cell - - - - - <br /> Baseline Mine - - - - - <br /> calibration no new Seltzer <br /> Scenario Description calibration "existing Early Mining <br /> dewater off mming conditions" <br /> Status of Variables For Each Scenario <br /> Variable 5 6 6max 7 8 <br /> Old Seltzer Well off off Off off off <br /> New Seltzer Well on on MAX on on <br /> Greenhouse Wells on on on on on <br /> Rogers Unlined Cell fines fines Fines fines fines <br /> Challenger Pit dewater no flow no flow - - <br /> Tucson South: East Cell no flow no now no flow no flow no flow <br /> Tucson South. West Cell - no flow no flow - no flow <br /> Tucson South: SW Cell lake fines fines lake fines <br /> Baseline Mine dewater lake lake - - <br /> Scenario Description east cell post mine Post east cell post mine <br /> mine isolated isolated <br /> Figures 5-14 show the relative change in water levels between the pre-mining existing conditions <br /> (scenario 3) and subsequent scenarios. In the figures,positive contours show increases in water level <br /> (mounding)while negative contours show decreases(drawdown). <br /> Figures 5 and 6 show the maximum simulated change in alluvial groundwater levels for scenario 4,the <br /> early mining stage during the wet and dry seasons,respectively. The figures show that the dewatering <br /> of the Challenger and southern portion of the Rogers Pit has a significant impact. The zone of notable <br /> drawdown(more than 2 feet)extends about 7600-8000 feet north-south and 3800-4300 feet east-west <br /> during the wet and dry seasons respectively.The maximum simulated drawdown is 16 feet during the <br /> dry season and 18 feet during the wet season. The greater drawdown during the wet season is the result <br /> of having to keep a constant low water level around mines during dewatering even though groundwater <br /> -9- August 2004 <br /> L-\39I9 OI9\TS GW ModeTTS Report\Tucson South Rpt_Iha&doc <br />