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Table 2 Page 2 of 4 Results of Chemical Analyses of Groundwater Samples ARCO Seance Station No. 2130, 7906 North EI Dorado Street Stockton, California Sample Total Fecal Number Date TPHG Benzene Toluene Eth lbenzene Xylene Coliform MW-3(continued) MW-3(55) 03/23/94 580 24 15 2 9 14 N MW-3(56) 06/22/94 <10 0 3 <0 3 <0 3 <0 5 N 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 N MW-3(72) 02/28/95 73 07 <0 5 <0 5 <0 5 N MW-3(73) 05/19/95 52*** <0 5 <0 5 <0 5 <0 5 N MW-3(73) 08/28/95 <50 <0 5 <0 5 <0 5 <0 5 NA MW-4 W-62-MW-4 08/28/92 1,200 310 270 23 140 NA MW-4(74) 10/06/92 260 26 3 5 <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 1,000 250 26 <2 5 120 N MW-4(74) 07/30/93 880 220 50 4 5 68 NA MW-4* 11/29/93 WELL INACCESSIBLE MW-4(54) 03/23/94 580 97 17 4 3 29 N MW-4(54) 06/22/94 1,700 930 44 52 20 N MW-4(59) 09/28/94 610 73 22 13 18 N MW4 12/01/94 1,000 400 31 59 15 N MW-4(74) 02/28/95 <50 09 <0 5 <0 5 <0 5 N MW-4(74) 05/19/95 <50 <0 5 <0 5 <0 5 <0 5 NA MW4(74) 08/28/95 <50 <0 5 <0 5 <0 5 <0 5 NA MW-5 W-62-MW-5 08/28/92 380 61 18 27 48 N MW-5(76) 10/06/92 460 59 34 21 45 <2 0 MW-5(76) 01/20/93 79 9 2 13 <0 5 4 2 <2 MW-5(76) 04/06/93 1,600 260 150 12 230 NA MW-5(76) 07/30/93 790 160 88 19 71 N MW-5(76) 11/29/93 9,600 1900 870 140 1300 NA MW-5(76) 03/23/94 WELL INACCESSIBLE MW-5(76) 06/22/94 WELL INACCESSIBLE 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 5 9 5 0 NA 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 0 6 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 0 6 <0 5 <0 5 <0 5 N N Ws108051114041092095B2 As Revision 2 10/30/95