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- TABLE 1 i GROUNDWATER ELEVATION AND ANALYTICAL SUMMARY ARCO Service Station No. 5469 130 South Wilson Vinay; Stockton,California I Elevation Top of Well Static Water Groundwater Groundwater Ethyl- Total i Well Top of Casing Screen Level Elevation Flow TPHG Benzene Toluene benzene Xylenes MTBE[1] Number Date (feet msl) (feet bgs) (feet bgs) (feet ms]) Direction gg/L gg/L pg/L µg/L gg/L pg/L MW-9 06/25/01 16.21 59 3791 -21.70 E-NE NS NS NS NS NS NS P 06/28/01 16.21 38.05 -21.84 NC <50 <0.5 <0.5 <0.5 <0.5 <2.0[2] j P 09/14/01 16.21 39.51 -23.30 NE <50 <0.5 <0.5 <0.5 <0.5 <2.0[2] P 12/14/01 16.21 40.46 -24.25 NE <50 <0.50 <0.50 <0.50 . <0.50 <0.50[2] P 02/21/02 16.21 40.64 -24.43 E-NE <50 3.3 <0.50 <0.50 <0.50 <0.50[2] P 04/23/02 16.21 40.25 -24.04 NE 59[8] <0.50 <0.50 <0.50 <0.50 <0.50[2] P 09/19/02 16.21 42.33 -26.12 NE <50 <0.50 <0.50 <0.50 <0.50 0.60[2] P 12/11/02 16.21 43.08 -26.87 NE <50 <0.50 <0.50 <0.50 <0.50 0.68[2] NP 01/14/03 16.21 NM NM NC <50 0.99 <0.50 <0.50 <0.50 1.7121 NP 02/12/03 16.21 NM NM NC <50 <0.50 <0.50 <0.50 <0.50 1.1121 P 02/26/03 16.21 43.08 -26.87 NC <50 <0.50 <0.50 <0.50 <0.50 0.63[2[ MW-10 06/25/01 16.40 59 38.00 -21.60 E-NE NS NS NS NS NS NS P 06/28/01 16.40 38.18 -21.78 NC <50 51 <0.5 <0.5 <0.5 260[2] P 09/14/01 16.40 39.64 -23.24 NE 88 4.1 <0.5 <0.5 <0.5 44[2] P 12/14/01 16.40 40.52 -24.12 NE 77[8] <0.50 <0.50 <0.50 <0.50 35[2] P 02/21/02 16.40 40.50 -24.10 E-NE <50 1.2 <0.50 <0.50 <0.50 27[2] P 04/23/02 16.40 40.47 -24.07 NE <50 1.2 <0.50 <0.50 <0.50 35[2] P 09/19/02 16.40 42.46 -26.06 NE 54[12] 1.0 <0.50 <0.50 <0.50 66[2] P 12/11/02 16.40 43.21 -26.81 NE <50 0.58 <0.50 <0.50 <0.50 83[2] NP 01/14/03 16.40 NM NM NC 57[181 <0.50 <0.50 <0.50 <0.50 77[2] NP 02/12/03 16.40 NM NM NC 86 1.4 <0.50 <0.50 . <0.50 75121 P 02/26/03 16.40 43.07 -26.67 NC 120 <1.0 <1.0 <1.0 4.0 83[2[ I Srf:ArUS Arco 5469_Quarterly_Data 5 of 6