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TABLE 1 <br /> GROUNDWATER MONITORING DATA <br /> ARCO Service Station No 2130 <br /> 7906 North El Dorado Street, Stockton, California <br /> Elevation Static Water Groundwater Ethyl- Total <br /> Well Top of Casing Top of Screen Level Elevation TPHg Benzene Toluene benzene Xylene MtBE <br /> Number Date (feet msl) (ft btc) (ft btc) (feet msl) 1,9/L 1191E RA gg/L µg/L µg/L Observations <br /> btc=below top of casing <br /> ins1=mean sea level <br /> bgs=below ground surface NA=Not analyzed NE=Not evaluated <br /> µglL=Analytical results in micrograms per liter FP=Free Product <br /> TPHg=Total Petroleum hydrearbons as gasoline S=Sheen <br /> MtBE=methyl tert butyl ether <br /> MtBE was analyzed using USEPA Method 8020 <br /> <=Below detection linut for the analytic methods used <br /> *=Raised method reporting limit(MRL)due to high analyte concentration requiring sample dilution <br /> **=Raised MRL due to matrix interference <br /> ***=The sample contains discrete non fuel components eluting in the gasoline range quantified as gasoline <br /> The chromatogram does not match the typical gasoline fingerprint <br /> [l]=Not sampled,as well is scheduled to be abandoned <br /> [2]MtBE was analyzed using USEPA Method 8260B <br /> [3]Chromatogram Pattern Weathered Gasoline C6 C12 <br /> [4]Benzene,toluene,ethylbenzene and total xylenes were analyzed using USEPA Method 8260B <br /> [51 Chromatogram Pattern Unidentified Hydrocarbons C6-C12 <br /> [61 Hydrocarbon pattern is present in the requested quantitation range but does not resemble the pattern of the requested fuel <br /> Arco_2130_4QMR02 <br /> 12 of 12 <br />