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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. Date P/NP TOC DTW SPH GWE GRO 6 T E X MTBE TBA RIPE ETBE TAME EOlanol 1,2-DCA EDB O.O. comments (ft-MSL) (feet) (feet) (ft.MSL) (P91L) 1P91L) (P91L) (POIL) IVg/L) (Pg1L) (P9/L) (P9/L) 149IL) IP9/L) (11911) (P9IL) (OOIL) MW-1 0623104 P 14.58 43.70 0.00 -29.12 <50 <0.50 <0.50 <0.50 <0.50 <0.50[2] <20 <0.50 <0.50 <0.50 <100 <0.50 - 3.11 - 0920/04 P 47.84 0.00 -33.26 <50 <0.50 <0.50 <0.50 <0.50 <0.50[2] <20 <1 .0 <1 .0 <1 .0 <100 <0.50 - 1 .00 - 1220/04 P 44.46 0.00 -29.88 <50 <0.50 <0.50 <0.50 <0.50 <0.50[2] <20 <1 .0 <1 .0 <1 .0 <100 <0.50 - 5.30 - 0328/05 P 41 .25 0.00 -26.67 <50 <0.50 <0.50 <0.50 <0.50 <0.50[2] <20 41 .0 <1 .0 <1.0 <1D0 <0.50 - 5.30 - 06119/05 P 41 .50 0.00 -26.92 <50 <0.50 <0.50 <0.50 <0.50 1 .0 [2]J <20 <0.50 <0.50 <0.50 <100 UJ 33 - 5.70 09/11/05 P 45.98 0.00 -31.40 51 <0.50 <0.50 <0.50 <0.50 0.75[2] <20 <0.50 <0.50 <0.50 <100 <0.50 - 3.80 - 12/12/05 P 43.00 0.00 -28.42 110 <0.50 <0.50 <0.50 0.60 <0.50[2] <20 <0.50 <0.50 <0.50 <100 UJ <0.50 - 4.00 - 03119/06 P 39.57 0.00 -24.99 130 <0.50 <0.50 <0.50 <0.50 <0.50rA <20 <0.50 <0.60 <0.50 <300 <0.50 - 3.60 - 06/13/06 P 39.29 0.00 4471 89 <0.50 <0.50 <0.50 <0.50 <0.50 <20 <0.50 <0.50 <0.50 <300 50.50 - 4.30 - 09/12/06 P 15.71 44.60 0.00 -28.89 98 <0.50 <0.50 <0.50 <0.50 <0.50 <20 <0.50 <0.50 <0.50 <300 <0.50 - 3.70 - 112114106 P 42.10 0.00 -29.39 140 <0.50 40.50 40,50 40.60 <0150 420 40.50 40.50 40.50 400 40.50 2.01 MW-2 01/07192 - 15.19 47.11 0.00 31 .92 80000 82 BO 48 170 - - - - - - - - - - 02r24/92 61 .59 0.00 46.40 - - - - - - - - - - - - - - 03131/92 61 .37 0.00 46.18 - - - - - - - - - - - - - - 0421/92 6170 000 -46.51 11500 16 <0.50 22 53 - - - - - - - - - - 05/11/92 62.36 0.00 47.17 - - - - - - - - - - - - - 0623192 62.44 0.00 -47.25 - - - - - - - - - - - - - - 07/0892 - 63,66 0.00 48.47 2, 100 140 3.6 27 45 - - - - - - - - - 08110/92 64.58 0.00 49.39 - - - - - - - - - - - - - - - 09/15/92 - 65.22 0.00 -50.03 - 10/0692 65.38 0.00 50.19 950 90 5.4 12 7.9 - - - - - - - - - - 11/11/92 - 64.69 0.00 49.50 12/04/92 - 63,96 0.00 48.77 - - - - - - - - - - - - - - 0120/93 - 62.69 0.00 47.50 11400 41 <2.5 24 6.4 - - - - - - - - - - 0322/93 - 60.79 0.00 45.60 - - - - - 04/06/93 60.27 0.00 -45.08 11000 7.1 <2.5 31 8.8 07/30/93 60.98 0.00 45.79 11200 35 2.6 30 15 - - - - - - - - - - 1129193 - 60.05 0.00 -44.86 11100 28 3.3 18 4.5 - - - - - - - - - - 032394 55.14 0.0D 39.95 1 ,200 14 7.7 6.9 5.2 - - - - - - - - - - 062294 - 55.22 0.00 -40.03 1 ,200 54 15 13 5.8 - - - - - - - - - 0928194 - 59.06 0.00 43.87 11600 370 2.9 47 13 - - - - - - - - - - 12101/94 - 58.00 0.00 42.81 220 21 <0.50 2.6 <0.50 - - - - - - - - - - 022a95 - 55.06 0.00 -39.89 110 <0.50 <0.50 <0.50 <0.50 - - - - - - - - - - 05/19/95 - 53. 15 0.00 -37.96 400 23 <0.50 2.1 40.50 - - - - - - - - - 0828195 54.83 0.00 39.64 650 84 <1* 9.3 1.1 - - - - - - - - - - 12/07/95 53.47 0.00 38.28 540 18 <1 .0' 3.0 <1 .0' - - - - - - - - - 02/05/96 51 .93 0.00 -36.74 310 2.8 0.60 1 .3 0.80 - - - - - - - - - - 05/30196 47.91 0.00 32.72 510 31 1 .0 5.9 1.3 <7.0" - - - - - - - - - 09/18/96 51 .80 0.00 -36.61 920 150 <2.5' 22 3.5 <15' - - - - - - - - - 1126/96 49.60 0.00 -34.41 520 21 <0.50 2.7 0.60 7.0 02130 4Q06 Tables 1-2.xls Page 5 of 24 SECOR