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. TA 1 • <br /> Groundwater Monitoring Data Page 4 of 4 <br /> ARCO Service Station No. 2186 <br /> 3212 North California Street <br /> Stockton, California <br /> Well Elevation of Static Water[1} Top of Elevation of Groundwater Total <br /> Sample No. Date Top of Casing Level Screen 2 Groundwater Flow Direction ITHG Benzene Toluene Eth lbenzene Xylenes MTBE[31 Observations <br /> HG=Total petroleum hydrocarbons as gasoline. Analytical results in parts per billion(ppb). <br /> MTBE=Methyl tert-butyl ether. Elevation datum is mean sea level. <br /> [11 Measured below top of using. <=Below detection limit for the analytical method used. <br /> [21 Measured from ground surface. FP=Free product.Measured in feet <br /> [31 MTBE was analyzed using USEPA Method 8020. S=Sheen. <br /> '=Raised MRL due to high analyte concentration requiring sample dilution. NM=Not measured. <br /> **=Reporting limit raised due to matrix interference. NA=Not analyzed. <br /> �k`ctKCICt� <br /> CP1C:IARCHIV E1ARC0121861QTRLY12186g399.xls <br /> I <br />