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v <br /> IIu <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 /> remained at nondetectable concentrations in well and MW-6 It appears as though there is <br /> residual petroleum 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 fourth quarter 1998 monitoring episode, we recommend the following <br /> o Conduct the First Quarter 1999 groundwater monitoring and sampling of wells MW-1 <br /> through MW-6 <br /> o Continue to analyze the groundwater samples from all well for MTBE by EPA Method <br /> 8020 <br />• Please contact our office at (209) 579-2221 if you have any questions or comments <br /> Respectfully Submitted, <br /> ATC Associates Inc <br /> Q�Q�ESSfp <br /> Drew Van Allen <br /> Staff Scientist <br /> � �r� Y� <br /> h0l v� <br /> oet <br /> Up' z <br /> Jeanne Homsey, J, CIVIL <br /> CA Registered Civil Engineer No 474101`,q <br /> CA <br /> cc Gerald Thiemann <br /> Mark List, RWQCB <br /> w 1626051quwtjyl4gr-1998 doc 3 <br />