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01 . L Table 1 Groundwater Monitoring Data 1995 to Present ARCO Service Station No 2130 7906 North El Dorado Street, Stockton, California Well Elevation Static Water Groundwater Ftbyl- Total Number Date Top of Casing Top of Screen Level Elevation 'I PHG Bc nztne Toluene benzene Xylene, M 113L Obseivations pg/l pg/l 1tg/1 ug/I ug/l pg/l MW-1 02/28/95 1458 6000 5421 -3963 340 2 1 <0 5 06 <0 5 NA No FP,No S MW-1 05/19/95 1458 5241 -3783 210 29 <0 5 07 <0 5 NA No FP,No S MW-1 08/28/95 1458 5404 -3946 240 32 <0 5 1 0 <0 5 NA No I-P,No S MW-1 12/07/95 1458 5267 -3809 190 1 7 <0 5 <0 5 <0 5 NA No FP,No S MW-1 02/05/96 1458 50 11 -3553 230 2 5 <0 5 05 <0 5 NA No FP,No S MW-1 05/30/96 14,58 47 17 -3259 180*** 1 2 <0 5 <0 5 <0 5 <4** No FP,No S MW-1 09/18/96 1458 5096 -3638 200 1 6 <0 5 <0 5 <0 5 <5** No FP,No S MW-1 11/26/96 1458 4880 -3422 220 1 5 <0 5 <0 5 <0 5 5 No FP,No S MW-1 03/24/97 1458 4373 -29 15 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S MW-1 05/20/97 1458 4432 -2974 230 <7** <0 6** <0 5 05 <5** No FP,No S MW-1 08/19/97 1458 4778 -3320 200 65 <0 5 <0 5 <0 5 <5 No FP,No S MW-1 11/19/97 1458 4595 -31 37 170 70 077 <0 5 063 <5 No FP,No S MW-1 03/04/98 1458 41 33 -2675 <50 051 <0 5 <0 5 <0 5 <5 No FP,No S MW-1 06/26/98 1458 39 13 -2455 248 1 73 <0 5 <0 5 <0 5 <5 No FP,No S MW-1 09/01/98 1458 4089 -2631 249 5 19 <0 5 <0 5 <0 5 <5 No FP,No S MW-1 12/02/98 1458 3820 -23 62 227 <0 5 <0 5 <0 5 <0 5 127 No FP,No S MW-1 03/31/99 1459 3468 -2010 152 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S MW-1 06/04/99 1458 35 98 -2140 168 263 <0 5 <0 5 <0 5 109 No FP,No S MW-1 09/02/99 1458 4049 -2591 232 1 04 <0 5 <0 5 <0 5 <5 No FP,No S MW-1 11/29/99 1458 3864 -2406 129 <0 5 <0 5 <0 5 <0 5 <2 5 No FP,No S MW-1 03/16/00 1458 3466 -2008 55 <0 5 <0 5 <0 5 <0 5 <2 5 No FP,No S MW-1 06/26/00 1458 3726 -2268 175 <0 5 <0 5 <0 5 <0 5 <2{21 No FP,No S C 1ARM21 MQTRLY\2130g200xis Delta Page 1 of 10 9/19/00