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(%ATC <br /> • A S S O C I A T E S I N C <br /> CONCLUSIONS <br /> Concentrations of petroleum hydrocarbon constituents decreased slightly in well MW-3 and <br /> decreased to non-detect in well MW-6 It appears as though there is residual petroleum <br /> hydrocarbon contamination remaining in the soil <br /> The direction of groundwater flow and the magnitude of hydraulic gradient are generally <br /> consistent with previous quarters <br /> RECOMMENDATIONS <br /> Based on the results of the first quarter 1998 monitonng episode, we recommend the following <br /> o Conduct the Second Quarter 1998 groundwater monitoring and sampling of wells MW-3 <br /> and MW-6 <br /> o Analyze the groundwater sample from well MW3 for MTBE to confirm the fourth quarter <br /> 1997 result <br /> o Discontinue analyzing the groundwater samples from all wells for oxygenate fuel <br /> additives <br /> Please contact our office at (209) 579-2221 if you have any questions or comments <br /> Respectfully Submitted, <br /> ATC Associates Inc <br /> flW4 do.- AA_ <br /> Drew Van Allen <br /> Staff Scientist <br /> rri <br /> Jeanne Hornsey, 1, "�'' frQ`c-, <br /> - -F— <br /> CA Registered Civil Engineer No 47410 1; <br /> CIVIL "r <br /> cc Gerald Thiemann � <br /> Elizabeth Thayer, RWQCB C C <br /> w 1943731quartlyllgr-199$doc 3 <br />