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T ' <br /> a�1 <br /> Groundwater Monitoring Data <br /> 1995 to Present <br /> ARCO Service Station No 2130 <br /> 7906 North EI Dorado Street, Stockton, California <br /> Page 8 of 8 <br /> Well Elevation Static Water Groundwater Ethyl- Total <br /> Number Date Top of Casing Top of Screen Level Elevation TPHG Benzene Toluene benzene X lene MTBE Observations <br /> Analytical results in parts per billion(ppb) <br /> TBE was analyzed using USEPA Method 8020 unless otherwise indicated(see below) <br /> Measurements in feet <br /> Datum in mean sea level <br /> Static water level measured in feet below top of casing <br /> --=Well not surveyed <br /> <=Below detection limit for the analytic methods used <br /> •=Raised method reporting limit(MRL)due to high analyte concentration requiring sample dilution <br /> :•=Raised MRL.due to matrix interference <br /> *""=The sample contains discrete non-fuel components eluting in the gasoline range,quantified as gasoline <br /> The chromatogram does not match the typical gasoline fingerprint. <br /> [1]=Not sampled,as well is scheduled to be abandoned. <br /> [2]=MME analyzed using USEPA Method 8260A. <br /> TB=Trip blank <br /> E=Not evaluated <br /> FP=Free product <br /> NA -Not analyzed <br /> =SI\_n <br /> CP1C 1ARCHI VE%A RC0121301QTRLY12130g399 xis <br />