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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 ms{) (feet b s) (feet b s) (feet ms]) Direction l- p u L L µ L µ L MW-6 NP 06/21/00 15.89 33 36.42 -20.53 SE <50 <2.0 <2.0 <2.0 <2.0 4,120[2] NP 09/08/00 15.89 38.07 -22.18 SE <50 <0.5 <0.5 <0.5 <0.5 6,320[21 NP 12/11/00 15.89 38.39 -22.50 SE&N <500151 <5.0[5] <5.0[51 <5A[5] <5.0[5] 6,910[2] P 03/22/01 15.89 37.13 -21.24 E-SE <500[5] <5.0[5] <5.0[51 <5.0[51 <5.0[51 8,290[2] P 05/24/01 15.89 36.85 -20.96 NC <500[5] <5.0[5] <5.0[5] <5.0[5] <5.0[51 16,100[2] 06/25/01 15.89 37.36 -21.47 E-NE NS NS NS NS NS NS P 09/14/01 15.89 38.90 -23.01 NE <50 <0.5 <0.5 <0.5 <0.5 22,000[21 P 12/14/01 15.89 40.00 -24.11 NE <50 0.85 <0.50 <0.50 <0.50 14,000[2] P 02/21/02 15.89 39.95 -24.06 E-NE 58[8] 3.3 <0.50 <0.50 <0.50 45,000[21 P 04/23/02 15.89 39.78 -23.89 NE <1,000[6] <10[6] <10[61 <10[6] <10[61 50,000[2][101 P 09/19/02 15.89 41.78 -25.89 NE 55,000[14,151 <100[14] <100[141 <100[14] <100[14] 69,000[2] P 12/11/02 15.89 42.64 -26.75 NE 39,000[14,16,18] <1,000 <1,000 <1,000 <1,000 85,000[2] NP 01/14/03 15.89 NM NM NC 33,000[18] <250 <250 <250 <250 67,000[2] NP 02/12/03 15.89 NM ]`"M NC <50,000 <500 `500 <500 <500 42,000[2] P 02/26/03 15.89 42.01 -26.12 NE <100,000 <1,000 <1,000 <1,000 <1,000 31,000[2] P 05/19/03 15.89 41.58 -25.69 Radial 29,000 A <50 A <50 A <50 A <50 A 59,000[2] A P 09/09/03 15.89 43.01 -27.12 NE 8,800[19] R <0.50 A <0.50 A <0.50 A <0.50 A 49,000[2] A P 12/10/03 15.89 43.67 -27.78 NE 25,000[19] R <50[23] J <50[23] J <50[23] J <50[23] J 46,000[2,23,241 J P 03/04/04 15.89 43.05 -27.16 NE 5,700[191 R <100 A <100 A <100 A <100 A 37,000[2] A 5TkATUS Arco-5469 Quancrly_Data 6of9