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ri <br /> • noted in the vicinity of well MW-2 The average hydraulic gradient on July 9, 1997 was calculated <br /> to be 0 009 Wit or approximately 50 ft/mile A summary of groundwater monitoring data is <br /> presented in Table 1 <br /> CONCLUSIONS <br /> Petroleum hydrocarbon constituents remained nondetectable in the groundwater samples collected <br /> from wells MW-1, MW-4, and MW-5 Concentrations of petroleum hydrocarbon constituents <br /> increased in wells MW-3 and MW-6 The sample collected from well MW-2 contained TPHg for <br /> the first time since March 1995 It appears as though there is residual petroleum hydrocarbon <br /> contamination remaining in the soil <br /> The direction of groundwater flow and the magnitude of hydraulic gradient are consistent with the <br /> previous quarter Groundwater elevations have decreased since reaching their highest point in <br /> April 1997 since quarterly monitoring was started in August 1993 <br /> RECOMMENDATIONS <br /> Based on the results of the third quarter 1997 monitoring episode, we recommend the following <br /> o Conduct the Fourth Quarter 1997 groundwater monitoring and sampling of wells MW2, <br /> MW-3, and MW-6 <br /> Please contact our office at (209) 579-2221 if you have any questions or comments <br /> Respectfully Submitted, <br /> Smith Technology Corporation <br /> Drew Van Allen <br /> Staff Scientist � �� S IpIV4� <br /> NNE <br /> H 01M S EY <br /> Jeanne Homse N10. 0047414 <br /> Y, � <br /> CA Registered Civil Engineer No 47410 Lx <br /> cc Gerald Thiemann <br /> Elizabeth Thayer, RWQCB <br /> w 1943731quaA1y\3gr-1997 doc 3 <br /> 0 <br /> Sian <br />