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Table 2 Page 2 of 4 Results of Chemical Analyses of Groundwater Samples ARCO Service Station No. 2130 7906 North EI Dorado Street, Stockton, California Sample Total Fecal Number Date TPHG Benzene Toluene Eth (benzene Xylene Coliform MW-3(55) 03/23/94 580 24 15 29 14 NA MW-3(56) 06/22/94 <10 03 <0 3 <0 3 <0 5 NA MW-3(60) 09/28/94 <50 07 <0 5 <0 5 <0 5 N MW-3 12/01/94 <50 08 <0 5 <0 5 <0 5 NA MW-3(72) 02/28/95 73 07 <0 5 <0 5 <0 5 NA MW-3(73) 05/19/95 52*** <0 5 <0 5 <0 5 <0 5 NA MW-3(73) 08/28/95 <50 <0 5 <0 5 <0 5 <0 5 NA MW-3(73) 12/07/95 <50 <0 5 <0 5 <0 5 <0 5 N MW-4 W-62-MW-4 08/28/92 1,200 310 270 23 140 NA MW-4(74) 10/06/92 260 26 35 <0 5 22 <2 0 MW-4(74) 01/20/93 820 160 6 9 <5* 71 <2 0 MW-4(74) 04/06/93 11000 250 26 <2 5 120 NA MW-4(74) 07/30/93 880 220 50 45 68 NA MW-4* 11/29/93 WELL VI ACCESSIBLE MW-4(54) 03/23/94 580 97 17 43 29 NA MW-4(54) 06/22/94 1,700 930 44 52 20 N MW-4(59) 09/28/94 610 73 22 13 18 NA MW-4 12/01/94 11000 400 31 59 15 NA MW-4(74) 02/28/95 <50 09 <0 5 <0 5 <0 5 NA MW-4{74) 05/19/95 <50 <0 5 <0 5 <0 5 <0 5 NA MW-4(74) 08/28/95 <50 <0 5 <0 5 <0 5 <0 5 NA MW4(74) 12/07/95 <50 <0 5 <0 5 <0 5 <0 5 N MW-5 W-62-MW-5 08/28/92 380 61 18 27 48 NA MW-5(76) 10/06/92 460 59 34 21 45 <2 0 MW-5(76) 01/20/93 79 92 13 <0 5 42 <2 0 MW-5(76) 04/06/93 1,600 260 150 12 230 N MW-5(76) 07/30/93 790 160 88 19 71 NA MW-5(76) 11/29/93 9,600 1900 870 140 1300 N MW-5(76) 03/23/94 WELL LNACCESSIBLE MW-5(76) 06/22/94 WELL LtiACCESSIBLE MW-5(76) 10/11/94 89 21 22 18 51 NA MW-5 12/01/94 870 280 23 41 87 N MW-5(76) 02/28/95 310 70 14 59 50 N MW-5(76) 05/19/95 66 84 <0 5 05 <0 5 N MW-5(76) 08/28/95 130 27 <0 5 45 06 N MW-5(76) 12/07/95 <200** 21 <0 5 07 <0 5 N MW-6 W-62-MW-6 12/04/92 330 <0 5 <0 5 <0 5 <0 5 N MW-6(72) 01/29/93 120 <0 5 <0 5 <0 5 <0 5 <2 0 MW-6(72) 04/06/93 160 06 <0 5 <0 5 <0 5 NA N 1xis10805111404\0010996C2 As Revision 1 1/17/96