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TABLE 1 GROUNDWATER MONITORING DATA - ARCO Service Station No. 5469 I 130 South Wilson Way, Stockton,California Elevation Static Water Groundwater Ethyl- Total Well Top of Casing Level Elevation TPHG Benzene Toluene benzene Xylene MTBE[1] Number Date (feet ms]) (feet bgs) (feet ms]) ptg/L µglL µglL pg/L µglL pg/L Observations MW-1 NP 06/21/00 16.28 36.79 -20.51 <50 <2.0 <2.0 <2.0 <2.0 <2.0[2] No FP,No S 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 NP 12/11/00 16.28 38.74 -22.46 <50 <0.5 <0.5 <0.5 <0.5 3.09[2] No FP,No S P 03/22/01 16.28 37.47 -21.19 <50 <0.5 <0.5 <0.5 <0.5 2.2[2] No FP,No S MW-2 NP 06/21/00 15.88 36.53 -20.65 <50 <2.0 <2.0 <2.0 <2.0 <2.0[21 No FP,No S 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 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 P 03/22/03 15.88 37.30 -21,42 <50 0.630 <0.5 <0.5 <O.S <2.0[2] No FP,No S MW-3 NP 06/21/00 15.93 36.42 -20.49 <50 <2.0 <2.0 <2.0 <2.0 19.2[2] No FP,No S 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 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 P 03/22/01 15.93 37.19 -21.26 <50 0.501 <0.5 <0.5 <0.5 <2.0[2] No FP,No S MW-4 NP 06/21/00 16.22 36.75 -20.53 1,020 1,470 <2.0 6.7 66.0 2,290[21 No FP,No S NP 09/08/00 16.22 38.31 -22.09 349 104 <2.5 <2.5 7.81 1,300[2] No FP,No S 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] No FP,No S P 03/22/01 16.22 37.49 -21.27 5,320 2,820 <0.5 <0.5 50.4 5,100[2][3] No FP,No S MW-5 NP 06/21/00 16.01 36.58 -20.57 <50 <2.0 <2.0 <2.0 <2.0 8,370[2] No FP,No S NP 09/08/00 16.01 38.21 -22.20 <50 <0.5 <0.5 <0.5 <0.5 9,870[2] No FP,No S NP 12/11/00 16.01 38.45 -22.44 <500[5] <5.0[5) <5.0[5] <5.0[51 <5.0[51 12,200[2] No FP,No S P 03/22/01 16.01 37.33 -21.32 <500[5] <5.0[5] <5.0[5] <5.0[5] <5.0[5] 15,600[21 No FP,No S I CAARC015469kQTRLY1200D15469 Quarterly Data.XtS I of 2 Delta 4/27/01