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Tab* <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 Casmg Level Screen Groundwater Direction TPHG Benzene Toluene benzene Xylenes MTBE 111 Observations <br /> Analytical results in parts per billion P=Purge <br /> HG-Total petroleum hydrocarbons as gasoline. NP=No purge <br /> MTHE-Methyl-tert bxnylether <-Below detection limits used by laboratory <br /> Elevation datum is mean sea level 111 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 /> Not measured <br /> NE-Not evaluated <br /> *-Raised MRL due to matrix interference <br /> •• The sample contains a lower boiling point hydrocarbon mxxtrire quantified as gasoline the chromatogram does not match the typical gasoline fingerprint <br /> Aatsed MRL due to 6tgh analyte concentration requiring sample ddubon <br /> 10S- <br /> Bailer blank <br /> Free product <br /> Sheen <br /> Obvious product odor <br /> SacIN WamPklDatalAmbrvelARCO%05481QTRLY\0548g499 As IT Corporation <br /> 02/18/2000 <br />