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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[1] Number Date feet msl feet b feet b s feet ms]) Direction !a MW-5 NP 06/21/00 16.01 33 36.58 -20.57 SE <50 <2.0 <2.0 <2.0 <2.0 8,370[2] NP 09/08/00 16.01 38.21 -22.20 SE <50 <0.5 <0.5 <0.5 <0.5 9,870[21 NP 12/11/00 16.01 38.45 -22.44 SE&N <500[5] <5.0[5] <5.0[51 <5.0[51 <5.0[5] 12,200[2] P 03/22/01 16.01 37.33 -21.32 E-SE <500[5] <5.0[51 <5.0[5] <5.0[51 <5.0[5] 15,600[2] P 05/24/01 16.01 37.05 -21.04 NC <500[5] <5.0[5] <5.0[51 <5.0[5] <5.0[51 14,400[21 06/25/01 16.01 37.60 -21.59 E-NE NS NS NS NS NS NS P 09/14/01 16.01 39.12 -23.11 NE <50 0.50 <0.5 <0.5 <0.5 16,000[21 P 12/14/01 16.01 40.20 -24.19 NE <50 4.5 <0.50 <0.50 <0.50 12,000[21 P 02/21/02 16.01 40.10 -24.09 E-NE <50 4.5 <0.50 <0.50 <0.50 13,000[21 P 04/23/02 16.01 39.98 -23.97 NE <50 2.9 <0.50 <0.50 <0.50 7,600[21[101 P 09/19/02 16.01 42.00 -25.99 NE 710[12] <0.50 <0.50 <0.50 <0.50 4,600[21 P 12/11/02 16.01 42.80 -26.79 NE 2,000[14,16,18] <25 <25 <25 <25 3,800[21 NP 01/I4/03 16.01 NM NM NC 1,100[8] 2.9 <2.5 <2.5 6.2 1,500[2] NP 02/12/03 16.01 NM NM A1C <50 <0.50 <0.50 <0.50 <0.50 5.4[2] P 02/26/03 16.01 42.28 -26.27 NE <50 <0.50 <0.50 <0.50 <0.50 14[161,[21 P 05/19/03 16.01 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 16.01 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 16.01 43.89 -27.88 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 16.01 42.90 -26.89 NE 380[191 R <0.50 A <0.50 A <0.50 A <0.50 A 1,200[2] A P 06/08/04 16.01 42.83 -26.82 NE 120[27] J <12 A <12 A <12 A <12 A 490[21 A 57RATU5 Arca 5469_Quarlerly_Data 5 of 9