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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[l] Number Date feet msl feet b feet b s) feet msl Direction µ µ 1t µ MW-5 NP 06/21/00 1601 33 3658 -2057 SE <50 <2 0 <2 0 <2 0 <2 0 8,370[2] NP 09/08/00 1601 3821 -2220 SE <50 <0 5 <0 5 <05 <0 5 9,870[2] NP 12/11/00 1601 3845 -2244 SE&N <500[5] <5 0[5] <5 0[5] <5 0[5] <5 0[5] 12,200[2] P 03/22/01 1601 3733 -2132 E-SE <500[5] <5 0[5] <5 0[5] <5 0[5] <5 0[5] 15,600[2] P 05/24/01 1601 3705 -2104 NC X500[5] <5 0[5] <5 0[5] <5 0[5] <5 0[5] 14,400[2] 06125/01 1601 3760 -2159 E-NE NS NS NS NS NS NS P 09/14/01 1601 39 12 -23 11 NE <50 0 50 <0 5 <0 5 <0 5 16,000[2] P 12/14/01 1601 4020 -24 19 NE <50 4 5 <0 50 <0 50 <0 50 12,000[2] P 02/21/02 1601 40 I0 -2409 E-NE <50 45 <0 50 <0 50 <0 50 13,000[2] P 04/23/02 1601 3998 -2397 NE <50 2 9 <0 50 <0 50 <0 50 7,600[2][10] P 09/19/02 1601 4200 -2599 NE 710[12] <0 50 <0 50 <0 50 <0 50 4,600[2] P 12/11/02 1601 4280 -2679 NE 2,000[14,16,18] <25 <25 <25 <25 3,800[2] NP 01/14/03 1601 NM NM NC 1,100[8] 29 <2 5 <2 5 6 2 1,500[2] NP 02/12/03 1601 NM NM NC <50 <0 50 <0 50 <0 50 <0 50 5 4[2] P 02/26/03 1601 4228 -2627 NE <50 <0 50 <0 50 <0 50 <0 50 14[16],[2] P 05/19/03 1601 41 75 -25 74 Radial 1,300 A <2 5 A <2 5 A <2 5 A <2 5 A 2,300[2] A P 09/09/03 1601 43 18 -27 17 NE 420[19] R <0 50 A <0 50 A <0 50 A <0 50 A 1,100[2] A P 12/10/03 1601 43 89 -2788 NE 510[19] R 0 61 A <0 50 A <0 50 A <0 50 A 1,200[2,22] J P 03/04/04 1601 4290 -2689 NE 380[19] R <0 50 A <0 50 A <0 50 A <0 50 A 1,200[2] A P 06/08/04 1601 4283 -2682 NE 120[27] 3 <12 A <12 A <12 A <12 A 490[2] A P 09/14/04 1601 4442 -2841 NE <50p[28] A <5 0 A <5 0 A <5 0 A <5 0 A 360[2,29] 1 i 5rRATUS Arco-5469_Quarieriy_Data 5 of 9