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V <br /> . %TC <br /> A S S O C I A T E S I N C <br /> analytical data is presented in Table 2 A copy of the laboratory analytical report is included in <br /> Attachment 2 An isoconcentration map depicting MTBE concentrations in the groundwater samples <br /> collected during the third quarter 2004 is shown on Figure 4 <br /> CONCLUSIONS <br /> Groundwater flow direction and gradient are generally consistent with previous sampling events <br /> Water table elevations have decreased since the April 2004 monitoring event The laboratory <br /> analytical results of the groundwater samples collected from MW1 through MW7 are generally <br /> similar the results of the groundwater samples collected from these wells in April 2004 <br /> RECOMMENDATIONS <br /> Based on the results of the third quarter 2004 monitoring event, we recommend continued quarterly <br /> groundwater monitoring The next quarterly sampling event is scheduled for October 2004 <br /> Please contact our office at(209) 579-2221 if you have any questions or comments <br /> Respectfully submitted, <br /> ATC Associates Inc <br /> 7VI-,LLJza� <br /> Mike Luksic, R G <br /> Staff Geologist ; +�? R <br /> XIK <br /> '� <br /> Jeanne Homsey, P E _ - <br /> CA Registered Civil Engineer No 47410 _ ' <br /> YA-4- <br /> cc Mr Robert Eggiman <br /> Jim Barton, RWQCB <br /> i <br /> i <br /> s\environment ii\224931Reportsl3QR-04 doe 4 <br />