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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 MSI) (feet bgs) (feet bgs) (feet MSI) Direction pg/L pg/L pg/L pg/L pg1L µg1 L 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[21 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] P 09/19/02 16.49 42.49 -26.00 NE 1,400[15] <10 <10 <10 <10 110[2] P 12/11/02 16.49 43.33 -26.84 NE 73[18] 1.2 <1.0 <1.0 1.9 98[2] NP 01/14/03 16.49 NM NM NC <501141 <0.50[141 <0.501141 <0.50[141 <0.50114 1.3[21 NP 02/12/03 16.49 NM NM NC <50 <0.50 <0.50 <0.50 . <0.50 <0.50[21 P 02/26/03 16.49 42.98 -26.49 NE <50 <0-50 <0.50 <0.50 0.55 <0.50[21 MW-8 06/25/01 16.46 33 38.10 -21.64 E-NE NS NS NS NS NS NS P 06/28/01 16.46 38.23 -21.77 NC <5000[6] 2,300 <50[6] <50[6] <50[6] 1,600[2] P 09/14/01 16.46 39.63 -23.17 NE <2,000[7] 980[7] <20[7] <20[7] <20[7] 7,500[2] P 12/14/01 16.46 40.72 -24.26 NE 29,000[8,9] 18,000[9] 640[9] 120[9]. 470[9] 17,000[2] P 02/21/02 16.46 40.39 -23.93 E-NE 30,000 15,000 <200 <200 <200 22,000[21 P 04/23/02 16.46 40.48 -24.02 NE 27,000[8] 16,000 <200 <200 <200 26,000[2][10] P 09/19/02 16.46 42.47 -26.01 NE 460[11] 190[13] <0.50 <0.50 <0.50 16,000[2] P 12/11/02 16.46 43.30 -26.84 NE 29,000[8] 9,600 <250 <250 <250 24,000[2] NP 01/14/03 16.46 NM NM NC 26,000[81 6,200 <50 <50 <50 18,000121 NP 02/12/03 16.46 NM NM NC 27,000 5,200 <250 <250 <250 21,000[2] P 02/26/03 16.46 43.11 -26.65 NE <50,000 5,000 <500 <500 <500 19,000[21 SMAMS Arco_5469_Quarterly Data I eof6