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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 GRO+ Benzene Toluene benzene Xylenes MTBE[I] Number Date feet msl (feet b s) feet b s) (feet msl) Direction µ L WL AgIL µ µ L MW-9 06/25/01 16.21 59 37.91 -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[21 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[21 P 02/21/02 16.21 40.64 -24.43 E-NE <50 3.3 <0.50 <0.50 <0.50 <0.50[21 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 1.7[2] NP 02/12/03 16.21 NM NM NC <50 <0.50 <0.50 <0.50 <0.50 L1[2] P 02/26/03 16.21 43.08 -26.87 NC <50 <0.50 <0.50 <0.50 <0.50 0.63[2] P 05/19/03 16.21 41.98 -25.77 Radial <50 A <0.50 A <0.50 A <0.50 A <0.50 A <0.50[2] A P 09/09/03 16.21 43.45 -27.24 NE <50 A <0.50 A <0.50 A <0.50 A <0.50 A 0.70[2] A P 12/10/03 16.21 44.47 -28.26 NE <50 A <0.50 A <0.50 A <0.50 A <0.50 A 2.0[2,25] J P 03/04/04 16.21 43.45 -27.24 NE <50 A <0.50 A <0.50 A <0.50 A <0.50 A 1.0[2] A 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 I6.40 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[21 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[18] <050 <0.50 <0.50 <0.50 77[2] NP 02/12/03 t6.40 NM NM NC 86 1.4 <0.50 <0.50 <0.50 75[2] P 02/26/03 16.40 43.07 -26.67 NC 120 <1.0 <1.0 <1.0 <1.0 83[2] P 05/19/03 16.40 42.03 -25.63 Radial 75 A 5.7 A <0.50 A <0.50 A <0.50 A 80[2] A P 09/09/03 16.40 43.55 -27.15 NE 310[19] R 37 A <0.50 A <0.50 A <0.50 A 790[2] A P 12/10/03 16.40 44.18 -27.78 NE 160[19] R <0.50 A <0.50 A <0.50 A <0.50 A 320[2,22] J P 03/04/04 16.40 43.62 -27.22 NE <50 A <5.0 A <5.0 A <5.0 A <5.0 A 76[2] A STRATU5 Arco_5469_Quarle rly_Data 8 of 9 ��_ YiiV"- _,.._._ ,.. ._..._.�,___.._ ..:ee.,......-..r..tu...-n.,ay.�w.....uw..,..a.. -..___ _.__._�._.r.�.u..+rr.�✓...-.. .:_......._�......,._ - 1W4Wn