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• Table 1 - <br /> Groundwater Monitoring Data <br /> ARCO Service Station No. 5469 <br /> 130 South Wilson Way, Stockton, California <br /> Elevation Static Water Groundwater Ethyl- Total <br /> Well Top of Casing Level Elevation TPHO Benzene Toluene benzene Xylene MTBE[1] <br /> Number Date (feet MSI) (feet b (feet tnsl) µg11 µg11 µg11 4gll lag/I µg11 Observations <br /> MW-1 NP 06/21/00 16.28 36.79 -20.51 <50 <2 <2 <2 <2 <2[2] No FP,No S <br /> MW-I NP 09/08/00 16.28 38.40 -22.12 <50 <0.5 <0.5 <0.5 <0.5 <2.5 No FP,No S <br /> MW-1 NP 12/11/00 16.28 38.74 -22.46 <50 <0.5 <0.5 <0.5 <0.5 3 No FP,No S <br /> MW-2 NP 06/21/00 15.88 36.53 -20.65 <50 <2 <2 <2 <2 <2[2] No FP,No S <br /> MW-2 NP 09/08/00 15.88 38.23 -22.35 <50 <0.5 <0.5 <0.5 <0.5 <2.5 No FP,No S <br /> MW-2 NP 12/11/00 15.88 38.49 -22.61 <50 <0.5 <0.5 <0.5 <0.5 <2.5 No FP,No S i <br /> MW-3 NP 06/21/00 15.93 36.42 -20.49 <50 <2 <2 <2 <2 19.2[2] No FP,No S <br /> MW-3 NP 09/08/00 15.93 38.05 -22.12 <50 <0.5 <0.5 <0.5 <0.5 <2.5 No FP,No S <br /> MW-3 NP 12/11/00 15.93 38.42 -22.49 <50 <0.5 <0.5 <0.5 <0.5 <2.5 No FP,No S <br /> MW-4 NP 06/21/00 16.22 36.75 -20.53 1,020 1,470 <2 6.7 66.0 2,290[2] No FP,No S <br /> MW-4 NP 09/08/00 16.22 38.31 -22.09 349 104 <2.5 <2.5 7.81 1,300 No FP,No S <br /> MW-4 NP 12/11/00 16.22 38.75 -22.53 <500 <5 <5 <5 <5 -3.050- No FP,No S <br /> -It � <br /> MW-5 NP 06/21/00 16.01 36.58 -20.57 <50 <2 <2 <2 <2 8,370[2] No FP,No S <br /> MW-5 NP 09/08/00 16.01 38.21 -22.20 <50 <0.5 <0.5 <0.5 <0.5 9,870 No FP,No S <br /> MW-5 NP 12/11/00 16.01 38.45 -22.44 <500 <5 <5 <5 <5 -1�-�99� No FP,No S <br /> MW-6 NP 06/21/00 15.89 36.42 -20.53 <50 <2 <2 <2 <2 4,120[2] No FP,No S <br /> MW-6 NP 09/08/00 15.89 38.07 -22.18 <50 <0.5 <0.5 <0.5 <0.5 6,320 No FP,No S <br /> MW-6 NP 12/11/00 15.89 38.39 -22.50 <500 <5 <5 <5 <5 6,910 No FP,No S <br /> msl=mean sea level <br /> bgs=below ground surface FP=Free product <br /> gg\L=micrograms per liter NA=Not analyzed. <br /> [I]MTBE was analysed using USEPA Method 8020. S=Sheen. <br /> 21 MTBE was analyzed using USEPA Method 8260. <=Below detection limit for the analytical methods used. <br /> C:1ARCO\5469%QTRLY12000L5469g400.xis Delta <br /> 1 of 1 1/24101 <br />