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TABLE 1 GROUNDWATER MONITORING DATA ARCO Service Station No. 5469 130 South Wilson Way, Stockton, California 4 Elevation Static Water Groundwater Ethyl- Total F Well Top of Casing Level Elevation TPHG Benzene Toluene benzene Xylene MTBE[1] Number Date feet msl feet b s feet ms1 gl µglL µg/L µg/L µg/L µg/L MW-1 NP 06/21/00 16.28 36.79 -20.51 <50 <2.0 <2.0 <2.0 <2.0 <2.0[2] NP 09/08/00 16.28 38.40 -22.12 <50 <0.5 <0.5 <0.5 <0.5 <2.5 NP 12/11/00 16.28 38.74 -22.46 <50 <0.5 <0.5 <0.5 <0.5 3.09[2] P 03/22/01 16.28 37.47 -21.19 <50 <0.5 <0.5 <0.5 <0.5 2.2[2] P 05/24/01 16.28 37.18 -2090 <50 <0.5 <0.5 <0.5 <0.5 <2[2] 06/25/01 16.28 37.70 -21.42 NS NS NS NS NS NS MW-2 NP 06/21/00 15.88 36.53 -20.65 <50 <2.0 <2.0 <2.0 <2.0 <2.0[2] NP 09/08/00 15.88 38.23 -22.35 <50 <0.5 <0.5 <0.5 <0.5 <2.5 JJ i NP 12/11/00 15.88 38.49 -22.61 <50 <0.5 <0.5 <0.5 <0.5 <2.5 1 P 03/22/01 15.88 37.30 -21.42 <50 0.630 <0.5 <0.5 <0.5 <2.0[2] P 05/24/01 15.88 36.99 -21.11 <50 0.536 <0.5 <0.5 <0.5 <2[2] 06/25/01 15.88 37.55 -21.67 NS NS NS NS NS NS MW-3 NP 06/21/00 1593 36.42 -20.49 <50 <2.0 <2.0 <2.0 <2.0 19.2[2] NP 09/08/00 15.93 38.05 -22.12 <50 <0.5 <0.5 <0.5 <0.5 <2.5 NP 12/11/00 15.93 38.42 -22.49 <50 <0.5 <0.5 <0.5 <0.5 <2.5 P 03/22/01 15.93 37.19 -21.26 <50 0.501 <0.5 <0.5 <0.5 <2.0[2] P 05/24/01 15.93 36.83 -20.90 <50 0.589 <0.5 <0.5 <0.5 <2[2] 06/25/01 15.93 37.34 -21.41 NS NS NS NS NS NS MW-4 NP 06/21/00 16.22 36.75 -20.53 1,020 1,470 <2.0 6.7 66.0 2,290[2] NP 09/08/00 16.22 38.31 -22.09 349 104 <2.5 <2.5 7.81 1,300[2] NP 12/11/00 16.22 38.75 -22.53 <500[6] <5.0[6] <5.0[6] <5.0[6] <5.0[6] 3,050[2] P 03/22/01 16.22 37.49 -21.27 5,320 2,820 <0.5 <0.5 50.4 5,100[2][3] P 05/24/01 16.22 37.23 -21.01 4,710 2,170 <25[6] <25[6] 54.9 5,610[2] 06/25/01 16.22 37.73 -21.51 NS NS NS NS NS NS 5469QUARTERLY.XLS Delta 1 of 3 8/17/01 Lam.... __.._�...._ ..