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TABLE 1 GROUNDWATER MONITORING DATA ` ARCO Service Station No.5469 130 South Wilson Way,Stockton,California Elevation Top of Weli Static Water Groundwater Groundwater Elhy1- Total Well Top of Casing Screen Level Elevation Flow TPHG Benzene Toluene benzene Xylene MTBE[j] Number Date feet ms]) Feet b feet b s feet ms]) Direction µ L mg1L µ Lpp-IL µ L L MW4 NP 06/21/00 16.22 34 36.75 -20.53 SE 1,020 1.,470 <2.0 6.7 66.0 2,290[21 NP 09/08/00 16.22 38.31 -22.09 SE 349 104 <2.5 <2.5 7.81 1,300121 NP 12/11/00 16.22 38.75 -22.53 SE&N <500[6] <5.0[61 <5.0[6] <5.0[61 <5.0[61 3,050[2] P 03/22/0) 16.22 37.49 -21.27 E-SE 5,320 2,820 <0.5 <0.5 50.4 5,100[2][3] P 05/24/01 16.22 37.23 -21.01 NC 4,710 2,170 <25[6] <25[6] 54.9 5,610[21 06/25/01 16.22 37.73 -21.51 E-NE NS NS NS NS NS NS P 09/14/01 16.22 39.27 -23.05 NE 2,000 980 <20 <20 20 24,000[2] 4 P 12/14/01 16.22 40.40 -24.18 NE 22,000[8] 10,000 <100 <100 <100 25,000[2] P 02/21/02 16.22 40.34 -24.12 E-NE 18,000[8] 9,500 <100 <100 <100 29,000[2] Y 04123102 16.22 40.12 23.90 NE 11,000(8] 4,700 <100 <100 <100 17,000[2][10] MW-5 NP 06/21/00 16.01 33 36.58 -20.57 SE <50 <2,0 <2.0 <2.0 <2.0 8,370[21 NP 09/08/00 16.01 38.21 -22.20 SE <50 <0.5 <0.5 <0.5 <0.5 9,870[2] NP 12/11/00 16.01 38.45 -22.44 SE&N <500151 <5.0[5] <5.0[5] <5.0[5] <5.0[51 12,200[2] P 03/22/01 16.01 37.33 -21.32 E-SE <500[5] <5.0[5] <5.0[5] <5.0[5] <5.0[5] 15,600[2] P 05/24/01 16.01 37.05 -21.04 NC <500[5] <5.0[5] <5.0[5] <5.0[5] <5.0[5] 14,400[21 06/25/0) 16.01 37.60 -21.59 E-NE NS NS NS NS NS NS P 09/14/01 16.01 39.12 -23.11 NE <50 0.50 <0.5 <0.5 <0.5 16,000[2] P 12/14/01 16.01 40.20 -24.t9 NE <50 4.5 <0,50 <0.50 <0.50 12,000[21 P 02/21/02 16.01 40.10 -24.09 E-NE <50 4.5 <0.50 <0.50 <0.50 13,000(2] P 04123/02 16.01 39.98 -23.97 NE <50 2.9 <0.50 <0.50 <0.50 7,600[2][10] MW-6 NP 06/21/00 15.89 33 36.42 -20.53 SE <50 <2.0 <2.0 <2.0 <2.0 4,120[2] NP 09/08/00 15.89 38.07 -22.18 SE <50 <0.5 <0.5 <0.5 <0.5 6,320[2) NP 12/11/00 15.89 38.39 -22.50 SE&N <500[5] <5.0[5] <5.0[51 <5.0[5] <5.0[5] 6,910[2] P 03/22/01 15.89 37.13 -21.24 E-SE <500[5] <5.0[5] <5.0[5] <5.0[5] <5.0[5] 8,290[2] P 05/24/01 15.89 36.85 -20.96 NC <500[5] <5.0[5] <5.0[5] <5.0[5] <5.0[5] 16,100[2] 06/25/01 15.89 37.36 -21.47 E-NE NS NS NS NS NS NS P 09/14/01 15.89 38.90 -23.01 NE <50 <0.5 <0.5 <0.5 <0.5 22,000[2] P 12/14/01 15.89 40.00 -24.11 NE <50 0.85 <0.50 <0.50 <0.50 14,000[2] P 02/21/02 15.89 39.95 -24.06 E-NE 58[81 33 <0.50 <0.50 <0.50 45,000[21 P 04/23/02 15.89 39.78 -23.89 NE <1,000[6] <10[61 <10[6] <10(6) <10[61 50,000[2][10] MW-7 06/25/01 16.49 33 38.20 -21.71 E-NE NS NS NS NS NS NS P 06/28/01 16.49 38.34 -21.85 NC <50 <0.5 <0.5 <0.5 <0.5 <2.0(2] P 09/14/01 16.49 39.67 -23.18 NE <50 <0.5 <0.5 <0.5 <0.5 <2.0[2) P 12/14/01 16.49 40.80 -24.31 NE <50 <0.50 <0.50 <0.50 <0.50 18[2] P 02/21/02 16.49 40.65 -24.16 E-NE <50 <0.50 <0.50 <0.50 <0.50 59[2] P 04/23/02 16.49 40.51 -24.02 NE <50 <0.50 <0.50 <0.50 <0.50 110[2] A rco_5469_Quanerly_Data 2of3