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Tal* P,of 5 <br /> Groundwater Monitoring Data <br /> 1995 to Present <br /> ARCO Service Station No. 548, 1612 Hammer Lane, Stockton, California <br /> Well Elevation Static Top Elevation Groundwater <br /> I <br /> Sainple of Top Water of of Flow Ethyl- Total <br /> Number Date of Casnig Level Screen Groundwater Direction TPHG Benzene Toluene benzene Xylenes MTBE(11 Observations <br /> Analytical results in parts per billion P n Purge <br /> HG-Total petroleum hydrocarbons as gasoline NP=No purge <br /> TBH Methyl-tert butylether <-Below detection limits used by laboratory <br /> Elevation datum is mean sea level i1)MTBE was analyzed using USEPA Method 8020 <br /> Measurements in feet Sample designations <br /> NA Not analyzed MW 4(34)-Well ID and sample depth(feet) <br /> NM-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 analyse concentration requiring sample dilution <br /> Bailer blank <br /> FP Free product <br /> - Sheen <br /> O Obvious product odor <br /> CP\C 1LSG13RDQTRARC010548Q398 XLS <br /> Sheetl <br /> 11/25/98 <br />