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TaIS 1 • <br /> Groundwater Monitoring Data Page 3 of 3 <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 TPHG Benzene Toluene Ethylbenzene Xylenes MTBE [3] Observations <br /> VW-3 (cont.) 11/20/97 NM 49.46 NM --- 160 4.6 4.4 2.6 6.7 <5 No FP,No S <br /> 02/17/98 NM 44.72 NM --- 93 <0.5 <0.5 <0.5 <0.5 <5 No FP,No S <br /> 06/24/98 NM 36.28 NM --- <50 <0.5 <0.5 <0.5 <0.5 <5 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 limit for the analytical method used. <br /> [21 Measured from ground surface. FP=Free product.Measured in feet. <br /> 131 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 /> N:1XLS1QMR108051147041080598G1.XLS <br /> Sheet I <br /> 8111198 <br />