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0 TabO 0 <br /> Groundwater Monitoring Data <br /> 1995 to Present <br /> ARCO Service Station No 548, 1612 Hammer Lane, Stockton, California Page 6 of 6 <br /> Well Elevation Static Top Elevation Groundwater <br /> Sample of Top Water of of Flow Ethyl- Total <br /> Number Date of Casing Level Screen Groundwater Direction TPHG Benzene Toluene benzene Xylenes MTBE[1) Observations <br /> alyhcal results in parts per billion P=Purge <br /> HG-Total petroleum hydrocarbons as gasolene NP=No purge <br /> MTBE-Methyl-Cert-butylether ¢-Below detection limits used by laboratory <br /> Elevation datum is mean sea level [i]MTBE was analyzed using USEPA Method 8020 <br /> Measurements in feet Sample designations <br /> A-Not analyzed MW4(34)-Well ID and sample depth(feet) <br /> M-Not measured <br /> E-Not evaluated <br /> -Raised MRL due to matrix interference <br /> ** The sample contains a lower boiling point hydrocarbon mixture quantified as gasoline,the chromatogram does not match the typical gasoline fingerprint <br /> ***-Raised MRL due to high analyte concentration requiring sample dilution <br /> -Bailer blank <br /> Free product <br /> - Sheen <br /> 110-Obvious product odor <br /> CM\ARC0105481QTRLY10548Q299 XLS � � <br />