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• Table 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 'blow Direction TPHG Benzene Toluene Ethylbenzene Xylenes MTBE [31 Observations <br /> PHG=Total petroleum hydrocarbons as gasoline. Analytical results in parts per billion(ppb). <br /> MTBE=Methyl tent-bury]ether. Elevation datum is mean sea level. <br /> [i 1 Measured below top of casing. <=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 /> CP\C:1ARCH[VEIARC0121861QTRLY12186g499.xis IT Corporation <br /> 02/2212000 <br />