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a ' <br /> Groundwater Level Trends <br /> Measurements over the past 40 years show a fairly continuous decline in groundwater levels in <br /> Eastern San Joaquin County(USACE 2001). Groundwater levels have declined at an average rate <br /> of 1.7 feet per year and`have dropped as much as 100 feet in some areas. It is estimated that <br /> groundwater overdraft during the past 40 years has reduced storage in the basin by as much as 2 <br /> million acre feet. Due to the continued overdraft of groundwater within the subbasin, significant <br /> groundwater depressions are present below the City of Stockton and east of Stockton (SJCFC 2004). <br /> r <br /> Several of these groundwater depressions extend to depths of about 100 feet below ground surface <br /> (or more than 40 feet below mean sea level). <br /> Groundwater levels near the ST&E site may have'actually risen since 1999 as several wells in this <br /> area monitored by the Northeastern San Joaquin County Groundwater Banking Authority(2004) <br /> have shown recent rises of the groundwater surface on the order of five to eight feet or more since <br /> 1999. <br /> F <br /> MainldlEnvironmentalSISTESWorkplan\Warkplan11192007.wpd 16 <br />