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F <br /> AGS Job No. 38012-2 <br /> rvice Station, Stockton, California <br /> ry GRADIENT CALCULATIONS <br /> The ground-water gradient was calculated to provide an indication <br /> of the direction of ground--water flow at the site. Elevation <br /> differences between the tops of the well casings were measured <br /> using an automatic level. Depths to water were measured with an <br /> electric water-level indicator. These data .were combined to <br /> calculate the relative elevation of the ground-water surface in <br /> each well and the slope of the potentiometric surface across the <br /> site. These data are summarized on Table 4. <br /> The calculations were used to construct a Ground-Water <br /> Potentiometric Surface Map across the site (Plate P-11) . The map <br /> indicates that the slope of the ground-water surface an June 29, <br /> 1988, was approximately 0.17-foot vertical per 100 feet <br /> iii horizontal, or 9 feet per mile. The calculated direction of <br /> ground-water flow at the time of measurement was north 35 degrees <br /> east. <br /> DISCUSSION <br /> - - ---­-Soil--samples-taken-from-`immediate) <br /> ---- -T � y above the ground-water <br /> surface in borings B-1 and B-3 contained levels of hydrocarbon <br /> 15 <br /> Applied 49eoSystems <br />