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October 25, 1993 <br /> 5.0 EVALUATION OF GROUNDWATER FLOW DIRECTION <br /> The groundwater gradient beneath the site was calculated from surveyed nm and casing <br /> wellhead elevations and monitoring well water depth data The depth below the nm to the <br /> water level was measured on October 1, 1993 to the nearest 0 01 ft in each well with an electric <br /> water-level indicator Well nm and casing elevations were measured to the nearest 0 01 ft by <br /> Tom O Morrow, Inc , of West Sacramento, California, a licensed surveyor The true <br /> elevations were calculated from Stockton City Benchmark Number 185 These data were used <br /> to calculate the elevation of the groundwater surface in each well (Table 4), and to evaluate the <br /> slope of the potentiometnc surface across the site <br /> t� <br /> TABLE 4 <br /> GROUNDWATER ELEVATION DATA <br /> PUNLA PROPERTY <br /> 1587 FRENCH CAMP TURNPIKE <br /> STOCKTON CALIFORNIA Water-level <br /> Well Elevation of Depth to <br /> Number <br /> RIM Water Elevation <br /> _ ft above MSL ft below nm ft below MSL ' <br /> October 1, 1993 <br /> 10 87 3965 -2878 <br /> -- MWI 3831 -2866 <br /> _= MW2 9 65 3917 -=-28 89— _ - --_ �— <br /> MW3 '10-28 <br /> MSL=Mean sea leve! datum <br /> Groundwater elevations on October 1, 1993 were between-28 66 and -28 89 ft below <br /> mean sea level, with a maximum difference in calculated groundwater elevations of 0 23 ft <br /> between MW2 and MW The measurements indicated that the groundwater surface sloped to <br /> the east-southeast theast atapproximately 0 3 ft/100 ft (0 003 ft/ft) at that time This calculated <br /> gradient indicates that the groundwater surface was essentially flat in this area when measured <br /> The groundwater gradient may be influenced by off-site production wells or influences of <br /> stream flows <br /> ROGER <br /> F( DTT i <br /> - is- ASSOCIATES <br />