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TableP Groundwater Monitoring Data 1995 to Present ARCO Service Station No 548, 1612 Hammer Lane, Stockton, California Well Elevation Static Top Elevation Groundwater Sample of Top Water of of Flow Ethyl- Total Number fate of Casing Level Screen Groundwater Direction TPIIG Benzene Toluene benzene Xylenes MTBE [II Observations VW-5D 12/30/98 NM Well not located Inaccessible because of soil stockpiles VW-513 03/31/99 NM 2565 -- E-SE Not scheduled for sampling No FP,Yes S,Yes 0 VW-513 06/28/99 NM 2674 -- SE Not scheduled for sampling No FP,No S,O=NE VW-513 09/10/99 NM 2900 -- E Not scheduled for sampling No FP,No S,O=NE VW-5D 12/13/99 NM 2820 -- E Not scheduled for sampling No FP,No S,O=NE VW-5D 03/28/00 NM 2497 -- SE Not scheduled for sampling No FP,No S,O=NE VW-5D 06/26/00 NM 2981 -- E Not scheduled for sampling No FP,No S,O=NE VW-5D 09/28/00 NM 28 31 -- E-NE Not scheduled for sampling No FP,No S,O=NE VW-5D 12/18/00 [NP] NM -- -- E Not scheduled for sampling Yes FP,Yes S,Yes O Analytical results in micrograms per Liter P=Purge PHG-Total petroleum hydrocarbons as gasoline NP=No purge MTBE-Methyl-tert-butylether <-Below detection limits used by laboratory Elevation datum is mean sea level [1]MTS$was analyzed using USEPA Method 8020 Measurements in feet [2]MTBE was analyzed using USEPA Method 8260 NA-Not analyzed Sample designations NM-Not measured MW-4(34)-Well ID and sample depth(feet) NE-Not evaluated *-Raised MRL due to matrix interference **-The sample contains a lower boiling point hydrocarbon mixture quantified as gasoline,the chromatogram does not match the typical gasoline fingerprint ***-Raised MRL due to high analyte concentration requiring sample dilution Bailer blank FP-Free product S- Sheen O-Obvious product odor C 1ARC0105481QTRLY1200010548g400 xis Delta 9 of 9 1/30101