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TABLE 2 Historical Groundwater Monitoring & Analytical Data ARCO Service Station No. 2130 7906 N. EL Dorado Street, Stockton, CA Well No. tate PIMP TOC DTw SPH GWE ORO a T E R MTBE TBA DIPE ETRE TAME Ethanol 1 ,2-DCA EDB D.O. Comments (SMSL) (het) (hall PMSL) (PgIL) (M91U (Y91L) W91L) (Y91L) (Pg/L) (P9/L) (P91L) (P9/L) (P9/L) (P91L) (P9/L) (P9/1.) MW-3 01/07/92 16.10 63.05 0.00 46.95 21100 41 <3.0 <3.0 57 - - - - - - - - - - 0224/92 - 62.37 0.00 -46.27 - - - - - - - - - - - - - - 03131/92 62.17 0.00 46.07 - - - - - - - - - - - - - - - 0421/92 62.51 0.00 46.41 110 4.9 <0.50 <0.50 4.6 - - - - - - - - - - 05/11/92 - 63.17 0.00 47.07 - - - - - - - - - - - - - - 0623192 63.26 0.00 -47. 16 - - - - - - - - - - - - - - - 07/08192 64.50 0.00 48.40 55 1 .5 <0.50 <0.50 1 .2 - - - - - - - - - - 08/10/92 65.43 0.00 49.33 - - - - - - - - - - - - - - - - 09/15192 66.07 0.00 49.97 - - - - - - - - - - - - - - - 10/06192 - 66.20 0.00 50.10 300 5.8 <0.50 <0.50 1.8 - - - - - - - - - - 11/1192 65.50 0.00 49,40 - - - - - - - - - - - - - - - 12/04/92 64.23 0.00 48.13 - - - - - - - - - - - - - - - 0120/93 - 63.45 0.00 47.35 420 6.5 0.70 <0.50 4.5 - - - - - - - - - - 0322/93 61 ,57 0.00 45.47 - - - - - - - - - - - - - - - 04/0693 61 .08 0.00 44.98 200 3.0 <0.50 <0.50 2.7 - - - - - - - - - - 07/30/93 - 61 .82 0.00 45.72 89 1 .5 <0.50 <0.50 <0.50 - - - - - - - - - 11/29/93 - 60.83 0.00 44.73 120 5.1 <0.50 <0.50 1.9 - - - - - - - - - - 03/2394 55.91 0.00 39.81 580 24 15 2.9 14 - - - - - - - - - - 06/22194 - 56.02 0.00 39.92 <10 0.30 <0.30 <0.30 <0.50 - - - - - - - - - - 09/28194 59.92 0.00 43.82 <50 0.70 <0.50 <0.50 <0.50 - - - - - - - - - - 12/01/94 58.80 0.00 42.70 <.50 0.80 <0.50 <0.50 <0.50 - - - - - - - - - - 0226/95 - 55.88 0.00 39.78 73 0.70 <0.50 <0.50 <0.50 - - - - - - - - - 05/1995 53.94 0.00 -37.84 52"• <0.50 <0.50 <0.50 <0.50 - - - - - - - - - - 082895 55.64 0.00 -39.54 <50 <0.50 <0.50 <0.50 <0.50 - - - - - - - - - - 12/07/95 - 54.30 0.00 38.20 <50 <0.50 <0.50 <0.50 <0.50 - - - - - - - - - - 02(0596 51 .73 0.00 35.63 <50 <0.50 <0.50 <0.50 <0.50 - - - - - - - - - - 05130/96 48.79 0.00 -32.69 <50 <0.50 <0.50 <0.50 <0.50 <3.0 - - - - - - - - 09/18196 - 52.73 0.00 36.63 <50 <0.50 <0.50 <0.50 <0.50 <3.0 - - - - - - - - - 1126196 50.41 0.00 34.31 <50 1 .9 <0.50 <0.50 <0.50 <3.0 - - - - - - - - - 03/24/97 45.29 0.00 -29.19 <50 <0.50 <0.50 <0.50 <0.50 <3.0 - - - - - - - - - 0620197 - 45.93 0.00 -29.83 <50 <0.50 <0.50 <0.50 <0.50 <3.0 - - - - - - - - - 08/19/97 49.56 0.00 -33.46 <60 <0.50 <0.50 <0.50 <0.50 <&() - - - - - - - - 11/19/97 - 47.62 0.00 -31.52 <50 1 .3 1 .1 <0.50 0.83 <5.0 - - - - - - - - 03104/98 42.95 0.00 -26.85 <50 <0.50 <0.50 <0.50 <0.50 <5.0 - - - - - - - - 062698 40.67 0.00 -24.57 <50 <0.50 <0.50 <0.50 <0.50 <5.0 <100 <2.0 <2.0 <2.0 - - - - 09/01/98 - 42.50 0.00 -26.40 72 <0.50 <0.50 <0.50 <0.50 <5.0 <100 <2.0 <2.0 <2.0 - - - - - 12/02/98 39.75 000 -23.65 <50 <0.50 <0.50 <0.50 <0.50 <5.0 <200 <2.0 <2.0 <2.0 - - - - 03/31/99 - 36. 17 0.00 -20.07 <50 0.54 <0.50 <0.50 <0.50 <5.0 <200 <2.0 <2.0 <2.0 - - - 06/04/99 37.56 0.00 -21.46 100 0.57 <0.50 4.4 0.88 <5.0 <200 <2.0 <2.0 <2.0 - - - - 09/0999 42. 16 0.00 -26,06 <50 <0.50 <0.50 <0.50 <0.50 <5.0 <200 <2.0 <2.0 <2.0 02130 4006 Tables 1.2xls Page 7 of 24 SECOR