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TABLE I 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[1] Number Date feet msl feet b s feet 6 feet msl Direction N µ µ µ µ µ MW-9 06/25/01 1621 59 3791 -2170 E-NE NS NS NS NS NS NS P 06/28/01 1621 3805 -2184 NC <50 <0 5 <0 5 <05 <0 5 <2 0[21 P 09/14/01 1621 3951 -23 30 NE <50 <0 5 <0 5 <0 5 <0 5 <2 0[2] P 12/14/01 1621 4046 -2425 NE <50 <0 50 <0 50 <0 50 <0 50 <0 50[2] P 02/21/02 1621 4064 -2443 E-NE <50 3 3 <0 50 <0 50 <0 50 <0 50[2] P 04/23/02 1621 4025 -24 04 NE 59[8] <0 50 <0 50 <0 50 <0 50 <0 50[2] P 09/19/02 1621 4233 -26 12 NE <50 <0 50 <0 50 <0 50 <0 50 0 60(2] P 12/11/02 1621 4308 -2687 NE <50 <0 50 <0 50 <0 50 <0 50 0 68[2] NP 01/14/03 1621 NM NM NC <50 0 99 <0 50 <0 50 <0 50 1 7[2] NP 02/12/03 1621 NM NM NC <50 <0 50 <0 50 <0 50 <0 50 1 1(2] P 02/26/03 1621 4308 -2687 NC <50 <0 50 <0 50 <0 50 <0 50 0 63[2] P 05/19/03 1621 4198 -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 1621 43 45 -2724 NE <50 A <0 50 A <0 50 A <0 50 A <0 50 A 0 70[2] A P 12/10/03 1621 44 47 -2826 NE <50 A <0 50 A <0 50 A <0 50 A <0 50 A 2 0[2,25] 1 P 03/04/04 1621 4345 -2724 NE <50 A <0 50 A <0 50 A <0 50 A <0 50 A 1 0[2] A P 06/08/04 1621 43 19 -2698 NE <50 A <0 50 A <0 50 A <0 50 A <0 50 A 4 2[21 A P 09/14/04 1621 4467 -2846 NE <50[28] A <0 50 A <0 50 A <0 50 A <0 50 A 1 5[2] A MW-10 06/25/01 1640 59 3800 -2160 E-NE NS NS NS NS NS NS P 06/28/01 1640 38 18 -2178 NC <50 51 <0 5 <0 5 <0 5 260[21 P 09/14/01 1640 3964 -2324 NE 88 41 <0 5 <0 5 <0 5 44[2] P 12/14/01 1640 4052 -24 12 NE 77[8] <0 50 <0 50 <0 50 <0 50 35[2] P 02/21/02 1640 4050 -24 10 E-NE <50 12 <0 50 <0 50 <0 50 27[2] P 04/23/02 1640 4047 -2407 NE <50 12 <0 50 <0 50 <0 50 35[2] P 09/19/02 1640 4246 -2606 NE 54[121 10 <0 50 <0 50 <0 50 66[2] P 12/11/02 1640 4321 -2681 NE <50 058 <0 50 <0 50 <0 50 83[2] NP 01/14/03 1640 NM NM NC 57[18] <0 50 <0 50 <0 50 <0 50 77[2] NP 02/12/03 1640 NM NM NC 86 14 <0 50 <0 50 <0 50 75[21 P 02/26/03 1640 4307 -2667 NC 120 <1 0 <1 0 <1 0 <1 0 83[21 P 05/19/03 1640 42 03 -25 63 Radial 75 A 5 7 A <0 50 A <0 50 A <0 50 A 80[21 A P 09/09/03 1640 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 1640 44 18 -2778 NE 160[19] R <0 50 A <0 50 A <0 50 A <0 50 A 320(2,22] 1 P 03/04/04 1640 43 62 -2722 NE <50 A <5 0 A <5 0 A <5 0 A <5 0 A 76[2] A P 06/08/04 1640 43 17 -2677 NE <50 A <5 0 A <5 0 A <5 0 A <5 0 A 85]2] A P 09/14/04 1640 4490 -2850 NE <250[28] A <2 5 A <2 5 A <2 5 A <2 5 A 100[2] A 5TRAT115 Arco 5469_Quarterly_Data 8 of 9