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• • i V Table 1 Groundwater Monitoring Data 1995 to Present ARCO Service Station No. 2130 7906 North El Dorado Street, Stockton, California Page 2 of 8 Well Elevation Static Water Groundwater Ethyl- Total Number Date Top of Casing Top of Screen Level Elevation TPHG Benzene Toluene benzene Xylene MTBE Observations MW-2 09/18/96 1519 5180 -3661 920 150 <2 5* 22 15 <15* No FP,No S MW-2 11/26/96 1519 4960 -3441 520 21 <05 2 7 0 6 7 No FP,No S MW-2 03/24/97 1519 4450 -2931 <500*** <3** <3** <3** <3** <20** No FP,No S MW-2 05/20/97 1519 4509 -2990 720 71 <1* 13 11 <6* No FP,No S MW-2 08/19/97 1519 4869 -33 50 1,200 240 <5 41 <5 <50** No FP,No S MW-2 11/19/97 1519 4677 -3158 <50 17 089 <0 5 0 87 <5 No FP,No S MW-2 03/04/98 1519 4218 -2699 <50 2 2 <0 5 <0 5 <0 5 51 No FP,No S MW-2 06/26/98 1519 3987 -2469 534 3 65 <0 5 <0 5 112 652 No FP,No S MW-2 09/01/98 1519 4161 -2642 322 484 <0 5 169 1 67 <5 No FP,No S MW-2 12/02/98 1519 3894 -2375 390 <0 5 <0 5 0 735 <0 5 158 No FP,No S MW-2 03/31/99 1519 3538 -20 19 98 7 6 6 0 69 0 579 233 655 No FP,No S MW-2 06/04/99 1519 3667 -2148 184 119 <0 5 103 0 669 126 No FP,No S MW-3 02/28/95 1610 6000 5588 -3978 73 0 7 <05 <0 5 <0 5 NA No FP,No S MW-3 05/19/95 1610 53 94 -3784 52*** <0 5 <0 5 <0 5 <0 5 NA No FP,No S MW-3 08/28/95 1610 5564 -3954 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S MW-3 12/07/95 1610 5430 -3820 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S MW-3 02/05/96 1610 5173 -3563 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S MW-3 05/30/96 1610 4879 -32 69 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S MW-3 09/18/96 1610 5273 -3663 <50 <0 5 <0 S <0 5 <0 5 <3 No FP,No S MW-3 11/26/96 1610 5041 -3431 <50 19 <0 5 <0 5 <0 5 <3 No FP,No S MW-3 03/24/97 1610 4529 -29 19 <50 <0 5 <05 <0 5 <0 5 <3 No FP,No S MW-3 05/20/97 1610 45 93 -2983 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S MW-3 08/19/97 1610 4956 -3346 <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S MW-3 11/19/97 1610 4762 -3152 <50 13 11 <0 5 0 83 <5 No FP,No S CF1E WRCO\2130\QTRLY12130Q299 XLS � E