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Ta4b . <br /> Groundwater Monitoring Data Page 3 of 3 <br /> ARCO Service Station No. 2186 <br /> 3212 North California Street <br /> Stockton, California <br /> WeII Elevation of Static Water[1] Top of Elevation of Groundwater Total <br /> Sam le No. Date Top of Casing Level Screen [21 Groundwater Flow Direction.TPHG Benzene Toluene Eth ]benzene Xylenes MTBE[31 Observations <br /> MW-4 11/20/97 13.83 48.36 45.00 -34.53 E 89 1.0 1.1 0.63 2.0 11 No FP, No S <br /> MW-4 02/17/98 13.83 43.55 -29.72 E-SE 180 0.57 <0.5 <0.5 0.59 29 No FP, No S <br /> MW-4 06/24/98 13.83 35.06 -21.23 E <50 <0.5 <0.5 <0.5 <0.5 16.2 No FP, No S <br /> MW-4 09/21/98 13.83 38.67 -24.84 E-NE 131 <0.5 <0.5 1.15 1.67 26.2 No FP,No S <br /> MW-4 12/14/98 13.83 36.61 -22.78 E-NE 136 1.08 <0.5 <0.5 <0.5 29.1 No FP,No S <br /> VW-3 05/23/96 NM 45.76 41.80 NM --- 290 <0.5 <0.5 <0.5 <0.5 <3 No FP, No S <br /> VW-3 09/19/96 NM 54.02 NM --- 310 <0.5 <0.5 <0.5 <0.5 <3 No FP, No S. <br /> VW-3 11/27/96 NM 51.15 NM --- 280 <0.5 <0.5 <0.5 <0.5 <3 No FP,No S <br /> VW-3 03/21/97 NM 42.49 NM --- 180 <0.5 <0.5 <0.5 <0.5 <3 No FP,No S <br /> VW-3 05/22/97 NM 44.28 NM --- 240 <0.5 <0.5 <0.5 <0.5 <3 No FP, No S <br /> VW-3 08/20/97 NM 50.21 NM --- 200 <0.5 <0.5 <0.5 <0.5 <5 No FP, No S <br /> VW-3 11/20/97 NM 49.46 NM --- 160 4.6 4.4 2.6 6.7 <5 No FP,No S <br /> VW-3 02/17/98 NM 44.72 NM - 93 <0.5 <0.5 <0.5 <0.5 <5 No FP,No S <br /> VW-3 06/24/98 NM 36.28 NM --- <50 <0.5 <0.5 <0.5 <0.5 <5 No FP,No S <br /> VW-3 09/21/98 NM 39.69 NM --- 227 4.56 <0.5 2.22 3.24 15.9 No FP, No S <br /> VW-3 12/14/98 NM 37.90 NM --- 57.1 <0.5 <0.5 <0.5 1.05 <5 No FP,No S <br /> TPHG=Total petroleum hydrocarbons as gasoline. Analytical results in parts per billion(ppb). <br /> MTBE=Methyl terl-butyl ether. Elevation datum is mean sea level. <br /> [1]Measured below top of casing. <=Below detection limit for the analytical method used. <br /> [2]Measured from ground surface. FP=Free product.Measured in feet. <br /> [3]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 /> 1 <br /> CP1E:lARC0121861QTRL,Y\2186Q498.XL.S <br /> Table 1 f <br />