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IR <br /> Tai <br /> Groundwater Monitoring Data - <br /> 1995 to Present <br /> ARCO Service Station No. 548, 1612 Hammer Lane, Stockton, California Page S of b <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[t] Observations <br /> Analytical results in pads per billion P=Purge <br /> HG-Total petroleum hydrocarbons as gasoline NP=No purge <br /> BE-Methyl-tert-butylether <-Below detection limits used by laboratory <br /> evation datum is mean sea level [1]MTBE was analyzed using USEPA Method 8020 <br /> Measurements in feet Sample designations <br /> A-Not analyzed MW-4(34)-Well ID and sample depth(feet). <br /> Not measured <br /> NE-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 /> FF-Free product <br /> S- Sheen <br /> Obvious product odor <br /> MC1ARCHIVEIARCO\050QTRLY10S48g399xls Puma& <br />