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Figure 15 <br />Sensitivity Analysis <br />Recharge <br />4930.0 <br />4925 <br />0 <br />. '~ <br />0 <br />4920 <br />. <br />4915.0 ~- 50% <br /> -f- 75% <br /> <br />491c'° ----__ 110% <br />~~- Observedl <br /> --~ Modeled <br />4905 <br />0 <br />. <br />4900 <br />0 <br />. <br />. <br />MW1 MW2 MW3 MW4 MW5 MW6 MW7 <br />6.0 SUMMARY <br />The following results from the MODFLOW simulations of the Mining and Post-Construction Scenarios are reported <br />below. <br />- Modeling was calibrated to seasonally high groundwater levels. Groundwater levels in the winter and eady <br />spring may decrease by a few feet resulting in the groundwater gradient going from a northwestedy path to a <br />more northerly path. <br />- Modeling of the mining scenarios indicated that some water levels in domestic wells and a few irrigation wells <br />east of the site may decrease as mining proceeds. The analysis performed was conservative and these wells <br />might already have problems producing their decreed flow rates. Mitigation measures mentioned in Section 4.2 <br />could help alleviate impacts to these wells. <br />Groundwater levels under WCR 27, immediately outside (east of the slope liner) were estimated to increase by <br />approximately 3 feet after the site has been reclaimed. <br />- Groundwater levels just west of the Site are estimated to decrease a maximum of 0.9 feet as a result of lining <br />the reclaimed water storage reservoirs. <br />Groundwater Model Report - SW TKO Water Storage Project -12 - February 2005 <br />