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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] Tap of Elevation of Groundwater Total <br /> Sample No Date Top of Casing Level Screen 2 Groundwater Flow Direction TPHG Benzene Toluene Eth lbenzene Xylenes MTBE(31 Observations <br /> VW-3 12/03/99 NM 3876 NM - 804 <0 5 <0 5 <0 5 <0 5 149 No FP,No S <br /> VW-3 04/03/00 NM 3545 NM --- <50 338 <0 5 186 562 296 No FP,No S <br /> HG=Total petroleum hydrocarbons as gasoline Analytical results in parts per billion(ppb) <br /> MTBE=Methyl tent-butyl ether Elevation datum is mean sea level <br /> [11 Measured below top of casing <=Below detection hnut 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 8021 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 /> CPIC 1ARCHIVZARC0121861QTRLW186g100 IT Corporation <br /> 5/17/00 <br />