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These modeling results illustrate the relationship between potential groundwater impacts and <br />' depth to groundwater for this site, and demonstrate that the significant issue is the question of what <br /> groundwater levels may be expected in the future As described above in Section 3 3 2, groundwater <br /> levels have been trending downward for several decades as a result of overdraft conditions Shorter <br /> periods of higher and lower groundwater levels result from temporary periods of greater than normal <br /> and less than normal precipitation, respectively This pattern is expected to continue into the <br />' foreseeable future <br /> Groundwater levels of approximately 35 feet bgs were measured when monitoring wells were <br /> initially installed at the site in July 1987 As shown by the hydrograph in Figure 8, those water <br /> Ievels were measured when regional groundwater levels were at a 25-year high, and have since <br /> declined to as much as 70 feet bgs, which apparently represents another extreme It seems most <br /> 1 likely to expect groundwater levels in the future of about 50 to 60 feet bgs If groundwater levels <br /> were to rise to 35 feet bgs, the recovery would take several years, and would then not be maintained <br /> for more than a few years, based on historical data <br /> i <br /> 1 <br /> 1 <br /> 1 <br /> SAC 116 07 14 AUGUST 1994 <br /> DAMES &MOORE \ <br />