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Table 1 <br /> Groundwater Monitoring Data <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 Total <br /> Satn ple Number Date Top of Casing Level Screen 2 Groundwater TPHG Benzene Toluene Eth lbenzene Xylenes MTBE Observations <br /> MW-1 09/25/95 14.65 58.05 45.6 43.40 20,000 780 2,000 690 4,100 No FP,No S <br /> 10/23/95 14.65 57.89 -43.24 20,000 590 1,100 600 3,600 No FP,No S <br /> 12/22/95 14.65 53.78 -39.13 730 3.5 <1 [2] 13 13 No FP,No S <br /> 02/16/96 14.65 50.13 -35.48 1,200 22 <1 [2] 51 24 No FP,No S <br /> 05/23/96 14.65 45.35 -30.70 760 9 1 22 5 <5 No FP,No S <br /> 11/27/96 14.65 50.77 -36.12 19,000 700 1,800 820 2,200 <100* No FP,No S <br /> MW-2 09/25/95 15.49 59.01 55.5 -43.52 <50 <0.5 <0.5 <0.5 2.0 No FP,No S <br /> 10/23/95 15.49 NM NM NA NA NA NA NA NM <br /> 12/22/95 15.49 54.76 -39.27 <50 <0.5 <0.5 <0.5 <0.5 No FP,No S <br /> 02/16/96 15.49 51.16 -35.67 <50 <0.5 <0.5 <0.5 <0.5 No FP,No S <br /> 05/23/96 15.49 46.28 -30.79 <50 <0.5 <0.5 <0.5 <0.5 <3 No FP,No S <br /> 11/27/96 15.49 51.67 -36.18 <50 <0.5 <0.5 <0.5 <0.5 <3 No FP,No S <br /> MW-3 09/25/95 14.55 57.90 55.30 43.35 <50 <0.5 <0.5 <0.5 <0.5 No FP,No S <br /> 10/23/95 14.55 NM NM NA NA NA NA NA NM <br /> 12/22/95 14.55 53.59 -39.04 <50 <0.5 <0.5 <0.5 <0.5 No FP,No S <br /> 02/16/96 14.55 49.99 -35.44 <50 <0.5 <0.5 <05 <0.5 No FP,No S <br /> 05/23/96 14.55 45.19 -30.64 <50 <0.5 <0.5 <0.5 <0.5 <3 No FP,No S <br /> 11/27/96 14.55 50.51 -35.96 <50 <0.5 <0.5 <0.5 <0.5 <3 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 /> 11/27/96 NM 51.15 NM 280 <0.5 <0.5 <0.5 <0.5 <3 No FP,No S <br /> 111 Measured below top of casing. <br /> [21 Measured from ground surface. <br /> *Raised MRf.due to high analyte concentration requiring sample dilution. <br /> Analytical results in pans per billion(ppb). FP=Free product. Measurements in feet. <br /> Elevation datum is mean sea level. S=Sheen. <br /> HG=Total petroleum hydrocarbons as gasoline. NM=Not measured. <br /> MTBE=Methyl tert-butyl ether <br /> =Below detection limit for the anal tical method used. NA=Not analyzed. <br /> N:\xls\DS05V 470ZIW0597MI As <br /> R< •'sinn 1:;!15!97 <br />