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TABLE 1 GROUNDWATER ELEVATION AND ANALYTICAL SUMMARY ARCO Service Station No. 5469 130 South Wilson Way,Stockton,California Elevation Top of Well Static Water Groundwater Groundwater Ethyl- Total Well Top of Casing Screen Level Elevation Flow TPHG Benzene Toluene benzene Xylenes MTBE[l] Number Date (feet ms]) (feet bgs) (feet bgs) (feet msl) Direction µg/L µg1L µgll, pg1L µglL µglL MW-3 NP 06/21/00 15.93 33 36.42 -20.49 SE <50 <2.0 <2.0 <2.0 <2.0 19.2[2] NP 09/08/00 15.93 38.05 -22.12 SE <50 <0.5 <0.5 <0.5 <0.5 <2.5 NP 12/11/00 15.93 38.42 -22.49 SE&N <50 <0.5 <0.5 <0.5 <0.5 <2.5 P 03/22/01 15.93 37.19 -21.26 E-SE <50 0.501 <0.5 <0.5 <0.5 <2.0[2] P 05/24/01 15.93 36.83 -20.90 NC <50 0.589 <0.5 <0.5 <0.5 <2[2] 06/25/01 15.93 37.34 -21.41 E-NE NS NS NS NS NS NS P 09/14/01 15.93 38.78 -22.85 NE <50 <0.5 <0.5 <0.5 <0.5 <2.0[2] P 12/14/01 15.93 40.10 -24.17 NE <50 <0.50 <0.50 <0.50 <0.50 0.56[2] P 02/21/02 15.93 39.95 -24.02 E-NE <50 <0.50 <0.50 <0.50 <0.50 2.1[2] P 04/23/02 15.93 39.82 -23.89 NE 78[8] 1.5 <0.50 <0.50 <0.50 1.1[21 P 09/19/02 15.93 41.78 -25.85 NE <50 <0.50 <0.50 <0.50 <0.50 2.3[2] P 12/11/02 15.93 42.65 -26.72 NE <50 <0.50 <0.50 <0.50 <0.50 2.1[2] NP 01/14/03 15.93 NM NM NC <50 <0.50 <0.50 <0.50 <0.50 2.0[2] NP 02/12/03 15.93 NM NM NC <50 <0.50 <0.50 <0.50 <0.50 1.4[2] P 02/26/03 15.93 41.99 -26.06 NE <50 <0.50 <0.50 <0.50 <0.50 1.6[2] MW-4 NP 06121/00 16.22 34 36.75 -20.53 SE 1,020 1,470 <2.0 6.7 66.0 2,290[2] NP 09/08/00 16.22 38.31 -22.09 SE 349 104 <2.5 <2.5 7.81 1,300[2] NP 12/11/00 16.22 38.75 -22.53 SE&N <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 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[2] 4 06/25/01 16.22 37.73 -21.51 E-NE NS NS NS NS NS NS P 09114/01 I6.22 39.27 -23.05 NE 2,000 980 <20 <20 20 24,000[2] 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] P 04/23/02 16.22 40.12 -23.90 NE 11,000[8] 4,700 <100 <100 <100 17,000[2][10] P 09/19/02 16.22 42.00 -25.78 NE 23,000[11,14] 5,000[14] <50[14] <50114] <501141 17,000[2] P 12/11/02 16.22 42.93 -26.71 NE <25,000[16,17] 3,700 <250 <250 <250 21,000[2] NP 01/14/03 16.22 NM NM NC 9,500[8] 1,900 <25 <25 <25 13,000[2] NP 02/12/03 16.22 NM NM NC <25,000 2,500 <250 <250 <250 18,000[21 P 02/26/03 16.22 42.44 -26.22 NE <50,000 6,900 <500 <500 540 4,000121 I Arco_540_Qaarter1y_Data 2 of 6