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" 1v <br /> A S S O C I A T E S I N C <br /> casing elevations, representing an average decrease in the water table elevation of approximately <br /> 0 54 feet since July 1997 The water level data were used to develop the groundwater elevation <br /> contour map (Figure 3) Assuming that horizontal isotropic conditions prevail, groundwater in <br /> the uppermost aquifer beneath the site flowed towards the northeast The average hydraulic <br /> gradient on December 23, 1997 was calculated to be 0 007 ft/ft or approximately 37 ft/mile A <br /> summary of groundwater monitoring data is presented in Table 1 <br /> CONCLUSIONS <br /> Concentrations from wells MW 1, MM2, and MW3 remain consistent with the results from the <br /> July 3, 1997 sampling event It appears as though there is petroleum hydrocarbon contamination <br /> remaining in the soil The direction of groundwater flow and the magnitude of hydraulic gradient <br /> are consistent with the previous event Groundwater elevations have decreased since July 1997 <br /> RECOMMENDATIONS <br /> Based on the results of the fourth quarter 1997 monitoring episode, we recommend the following <br /> o Conduct the First Quarter 1998 groundwater monitoring and sampling wells MW i, MW2, <br /> MW3, and CW <br /> Please contact our office at (209) 579-2221 if you have any questions or comments <br /> Respectfully Submitted, <br /> ATC Associates <br /> Drew Van Allen <br /> Staff Scientist <br /> Jeanne Homsey, <br /> CA Registered Civil Engineer No 47410 <br /> cc Mr and Mrs Raymond Farmer <br /> Elizabeth Thayer, RWQCB <br /> w 1977311qu<.u11y14gr-1997 doe 3 <br />