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• • • TABLE I GROUNDWATER MONITORING DATA ARCO Service Station No 2130 7906 North El Dorado Street, Stockton, California Elevation Static Water Groundwater Ethyl- Total Well Top of Casing Top of Screen Level Elevation TPHg Benzene Toluene benzene Xylene MtBE Number Date (feet msl) (ft btc) (ft btc) (feet msl) µg/L µg/L jAg/L -- ._ n/L n/L µg/L Observations MW-1 02/28/95 1458 6000 5421 -3963 340 21 <0 5 0 6 <0 5 NA No FP,No S 05/19/95 1458 5241 -3783 210 2 9 <0 5 0 7 <0 5 NA No FP,No S 08/28/95 1458 5404 -3946 240 3 2 <0 5 10 <0 5 NA No FP,No S 12/07/95 1458 5267 -38 09 190 17 <0 5 <0 5 <0 5 NA No FP,No S 02/05/96 1458 5011 -3553 230 25 <0 5 0 5 <0 5 NA No FP,No S 05/30/96 1458 47 17 -3259 180*** 12 <0 5 <0 5 <0 5 <4** No FP,No S 09/18/96 1458 5096 -3638 200 16 <0 5 <0 5 <0 5 <5** No FP,No S 11/26/96 1458 4880 -3422 220 15 <0 5 <0 5 <0 5 5 No FP,No S 03/24/97 1458 4373 -29 15 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S 05/20/97 1458 4432 -2974 230 <7** <0 6** <0 5 0 5 <5** No FP,No S 08/19/97 1458 4778 -3320 200 6 5 <0 5 <0 5 <0 5 <5 No FP,No S 11/19/97 1458 4595 -3137 170 7 0 077 <0 5 063 <5 No FP,No S 03/04/98 1458 4133 -2675 <50 051 <0 5 <0 5 <0 5 <5 No FP,No S 06/26/98 1458 39 13 -2455 248 173 <0 5 <0 5 <0 5 <5 No FP,No S 09/01/98 1458 40 89 -2631 249 5 19 <0 5 <0 5 <0 5 <5 No FP,No S 12/02/98 1458 3820 -2362 227 <0 5 <0 5 <0 5 <05 127 No FP,No S 03/31/99 1458 3468 -2010 152 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S 06/04/99 1458 35 98 -2140 168 2 63 <0 5 <0 5 <0 5 109 No FP,No S 09/02/99 1458 4049 -25 91 232 104 <0 5 <0 5 <0 5 <5 No FP,No S 11/29/99 1458 38 64 -2406 129 <0 5 <0 5 <0 5 <0 5 <2 5 No FP,No S 03/16/00 1458 3466 -2008 55 <0 5 <0 5 <0 5 <0 5 <2 5 No FP,No S 06/26/00 1458 3726 -2268 175 <0 5 <0 5 <0 5 <0 5 <2[2] No FP,No S 09/28/00 1458 4149 -2691 86 9[3] 2 14 <0 5 <05 <0 5 <2[2] No FP,No S 12/19/00 1458 37 17 -2259 <50 <0 5 <0 5 <0 5 <0 5 <2 5 No FP,No S 03/15/01 1458 35 00 -2042 <50 <2 [4] <2 [4] <2 [4] <2 [4] <2[2] No FP,No S 06/20/01 1458 3827 -2369 <50 <2[4] <2 [4] <2 [4] <2 [4] <2[2] No FP,No S 09/I2/01 1458 4247 -27 89 <50 <2[4] <2 [4] <2 [4] <2 [4] <2[2j No FP,No S 12/12/01 1458 3936 -2478 <50 <1 0[4] <1 0[4] <1 0[4] <1 0[4] 0 54[2] No FP,No S 03/13/02 1458 3646 -2188 <50 <0 50 <0 50 <0 50 <0 50 <0 50[2] No FP,No S 06/18/02 1458 3865 -2407 <50 <0 50 <0 50 <0 50 <0 50 <0 50[2] No FP,No S 09/11/02 1458 4373 -29 15 <50 <0 50 <0 50 <0 50 <0 50 <0 50[2j No FP,No S Arco_2]30_4QMR02 1 of 12