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TABLE I <br /> GROUNDWATER MONITORING DATA <br /> ARCO Service Station No 2130 <br /> 7906 North El Dorado Street, Stockton, California <br /> Elevation Static Water Groundwater Ethyl- Total <br /> Well Top of Casing Top of Screen Level Elevation TPHG Benzene Toluene benzene Xylene MTBE <br /> Number Date feet msl feet b s feet b s feet msl /L L L L /L UJL Observations <br /> MW-5 08/28/95 15 10 5800 5461 -3951 130 27 <0 5 45 0 6 NA No FP,No S <br /> 12/07/95 15 10 5320 -38 10 <200** 2 1 <0 5 0 7 <0 5 NA No FP,No S <br /> 02/05/96 15 10 5067 -35 57 <200** 3 0 <0 5 0 9 <0 5 NA No FP,No S <br /> 05/30/96 15 10 4770 -3260 140*** 15 <0 5 5 2 <0 5 <4** No FP,No S <br /> 09/18/96 15 10 5156 -3646 <300*** 33 <0 5 9 0 <0 5 <3 No FP,No S <br /> 11/26/96 15 10 4934 -3424 <200*** 19 <0 5 0 5 <0 5 <4** No FP,No S <br /> 03/24/97 15 10 4424 -29 14 <200*** 3 2 <0 5 1 6 3 0 <8** No FP,No S <br /> 05/20/97 15 10 4485 -2975 270 31 5 0 5 0 15 <20** No FP,No S <br /> 08/19/97 15 10 4837 -3327 100 20 <0 5 38 <0 5 <5 No FP,No S <br /> 11/19/97 15 10 4662 -3152 <50 12 094 <0 5 091 <5 No FP,No S <br /> 03/04/98 15 10 41 90 -2680 <50 5 6 1 8 1 6 3 1 <5 No FP,No S <br /> 06/26/98 15 10 3964 -2454 <50 4 19 0 624 0 794 0 999 <5 No FP,No S <br /> 09/01/98 15 10 4144 -2634 <50 13 2 <0 5 139 0 535 5 15 No FP,No S <br /> 12/02/98 15 10 3874 -23 64 <50 0 693 <0 5 <0 5 <0 5 8 94 No FP,No S <br /> 03/31/99 15 10 35 17 -2007 <50 133 0 586 <0 5 152 9 94 No FP,No S <br /> 06/04/99 15 10 3648 -2138 <50 5 03 0 721 <0 5 1 6 706 No FP,No S <br /> 09/02/99 15 10 4105 -25 95 <50 6 14 <0 5 183 0 848 <5 No FP,No S <br /> 11/29/99 15 10 39 16 -2406 <50 0 585 0 633 <0 5 145 269 No FP,No S <br /> 03/16/00 15 10 35 16 -2006 57 5 170 <0 5 <0 5 <0 5 493 No FP,No S <br /> 06/26/00 15 10 3780 -2270 523 369 <0 5 2 2 0 825 <2[2] No FP,No S <br /> 09/28/00 15 10 4205 -2695 <50 1 34 <0 5 <0 5 <0 5 <2[2] No FP,No S <br /> 12/19/00 15 10 3768 -2258 <50 0 561 149 <0 5 300 566 No FP,No S <br /> 03/15/01 15 10 35 50 -2040 916 [3] <2 [4] 6 71 [4] <2 [4] <2 [41 89 2 [21 No FP,No S <br /> 06/20/01 15 10 3882 -2372 78[3] 2 5[4] 5 5[4] 4 7[4] 11[4] 60[21 No FP,No S <br /> 09/12/01 15 10 43 05 -2795 <50 <2[4] <2[4] <2[4] <2[4] 29[2] No FP,No S <br /> 12/12/01 15 10 3989 -2479 <50 <1 0[4] <1 0[4] <1 0[4] 1 2[4] 25[2] No FP,No S <br /> 03/13/02 15 10 3699 -21 89 <50 <0 50 061 <0 50 <0 50 35[2j No FP,No S <br /> Arco 2130_Qvarterly D=XLS Delta <br /> 5 of 12 <br />