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TABLE 2 Historical Groundwater Monitoring & Analytical Data ARCO Service Station No. 2130 7906 N. EL Dorado Street, Stockton, CA Well Na. pate pD4p TOC DTW SPH GWE GRO B T E X MTBE TBA DIPE ETBE TAME Ethanol 1,2-DCA EDB D.O. Comm nts (ft-MSL) (feet) (feet) (e-Ms0) (y91L) (p91U) (P9/Ul (492) WgfL) (P9IU) (PBL) WNLI Wa/L) (pglL) (40IU) (Pe/U) (PNU) MW-5 03104198 15.10 41 .90 0.00 -26.80 <50 5.6 1 .6 1 .6 3.1 <5.0 - - - - - - - - - OM6/98 - 39.64 0.00 -24.54 <50 4.2 0.62 0.79 1 .0 <5.0 <100 <2.0 <2.0 <2.0 - - - - - 09/01/98 41 ,44 0.00 -26.34 <50 13 <0.50 1 .4 0.54 5.2 <100 <20 <2.0 <2.0 - - - - - 12/02198 - 38.74 0.00 -23.64 <50 0.69 <0.50 <0.50 <0.50 8.9 <200 <2.0 2.0 2.0 - - - - - 0331/99 35.17 0.00 -20.07 <50 1 .3 D.59 <0.50 1.5 9.9 <200 <2.0 <2.0 <2.0 - - - - 06/04/99 36.48 0.00 -21.38 <50 5.0 0.72 <0.50 1.6 7.1 <200 <2.0 <2.0 <2.0 - - - - - 09/02/99 - 41 .05 0.00 -25.95 <50 6.1 <0.50 1 .8 0.85 <5.0 <200 <2.0 <2.0 <20 - - - - - 1129199 39.16 0.00 -24.06 <50 0.59 0.63 <0.50 1 .5 27 <200 <2.0 <2.0 <20 - - - - - 03/16/00 35.16 0.00 -20.06 57 5.2 <0.50 <0.50 <0.50 4.9 <200 <2.0 <2.0 <2.0 - - - - - 0626100 - 37.80 0.00 -22.70 52 3.7 <0.50 2.2 0.82 2.0 [2] <100 <2.0 <2.0 <2.0 - - - - - 0928/00 42.05 0.00 -26.95 <50 1 .3 <0.50 <0.50 <0.50 <2.0 [2] <200 <2.0 <2.0 <2.0 - - - - - 12119I00 37.68 0.00 -2258 <50 0.56 1 .5 <0.50 3.0 57 <200 <2.0 <2.0 <20 - - - - - 03/15/01 - 35.50 0.00 -20.40 91.6 [J] <2.0 [4) 6.71 [4] <2.0 [4] <2.0 [4] 89.2 [2] <200 <2.0 <2.0 2.4 - - - - - 0620/01 38.82 0.00 -23.72 78[3] 2.5(4] 5.5[4] 4.7[4] 11 [4] 60[2] <100 <2.0 <2.0 <2.0 - - - - - 09/12101 4&05 0.00 .27.95 <50 <2.0 [4] <2.0 (4] <2.0 [4] <2.0 [4] 29[2] <200 <2.0 2.D <2.0 - - - - - 12/12101 39.89 0.00 -24.79 <50 <1 .0[4] <1 .0[4] <1 .0[4] 1 .2[41 25[2] <5.0 <0.50 40.50 <0.50 - - - - - 03/13/02 36.99 0.00 -21 .89 <50 <0.50 0.61 <0.50 <0.50 35121 <5.0 <0.50 <0.50 <0.50 - - - - M8102 W 39.19 0.00 -24.09 <50 <0.50 0.61 <0.50 3.3 7.8[21 <5.0 <0.50 <0.50 <0.50 - - - - - 09/11/02 - 44.33 0.00 -29.23 63 3.4 5.0 1 .9 14 9.1 [2] <5.0 <0.50 <0.50 <0.50 - - - - - 12/18/02 41 .66 0.00 -26.58 <50 <0.50 4.4 <0.50 5.8 20[2] <5.0 <0.50 <0.50 <0.50 - - - - - 03106103 P 39.34 0.00 -24.24 <50 1 .5 1 .7 0.51 3.2 3.0[2] <20 <0.50 <0.50 <0.50 <100 <0.50 <0.50 0.56 - 06111/03 P 38.68 0.00 -23.58 51 2.7 5.5 1 .2 8.4 4.2[2) <100 <5.0 <5.0 <5.0 <500 - - 2.67 - 09123/03 P 42.70 0.00 -27.60 95 <2.5 2.5 <25 11 6.0[2] <100 <5.0 <5.0 <5.0 <500 - - - - 12/09/03 P 41 .73 0.00 -26.63 <50 <0.50 <0.50 <0.50 0.79 <0.50[2l <20 <1 .0 <1 .0 <1 .0 <100 <0.50 - - 03109/04 P 39.42 0.00 -24.32 950 34 0.66 7.1 <0.50 4.6[2] <20 <1.0 <1 .0 <1 .0 <100 <0.50 - 208 - 0623104 P 44.28 0.00 -29.18 66 3.3 8.7 1 .4 10 1 .8[2] <20 <0.50 <0.50 <0.50 <100 <0.50 - 2.43 - 09/20/04 P 48.44 0.00 93.34 450 <10 <10 <10 <10 <10[2] <400 <20 <20 <20 <2,000 470 - 0.80 - 12/21/04 P 44.99 0.00 -29.89 330 3.0 5.1 1 .3 11 3aM 20 41 .0 <10 <1.0 <100 <0.50 - 1 .30 WATER 0327/05 P 41 .74 0.00 -26.64 <50 0.78 1 .4 0.80 3.4 6.6[2] <20 <1 .0 <1 .0 <1.0 <100 <0.50 - 2.20 - O6/19/OS P 42.10 0.00 -27.00 <50 0.87 J 0.82 40.50 21 4.4 rAJ <20 <0.50 <0.50 <0.50 <100 UJ <0.50 - 2.60 - 09/11/05 P 46.64 0.00 91 .54 170 5.4 6.4 3.2 15 14121 <20 <0.50 <0.60 <D.50 <100 <0.50 - 2.20 - 12/11/05 P 43.49 0.00 -28.39 120 4.8 3.8 1 .2 8.6 19121 <20 <0.50 <0.50 0.56 <100 UJ <0.50 - 2.60 - 03M9/06 P 40.18 0.00 -25.08 63 J 2.7 J 2.7 J 1 .91 6.9 J 4.4 rAJ <20 UJ <0.50 UJ <0.50 UJ <0.50 W 74200 J <0.50 UJ - 1 .40 - O6MV06 P 39.91 0.00 -24.81 <50 1 .7 2.8 1 .1 8.0 2.4 <20 <0.50 <0.50 <0.50 <300 <0.50 - 2.00 - 09/14/O6 P 16.17 45.30 0.00 -29.13 250 9.2 12 5.6 36 12 <20 <0.50 40.50 0.98 <300 <0.50 - 1 .10 - 12113D0 P 42.70 0.00 -26.53 450 40.50 40.50 40.50 49.50 <0.50 Q0 <0.50 <0.50 <0.50 Q00 <0.50 1A5 MW-6 12104/92 - 14.55 63.40 0.00 -48.85 330 <0.50 <0.50 <0.50 40.50 - - - - - - - - - - 0120/93 61 .87 0.00 -47.32 - - - - - - - - - - - - - - - 0129/93 - - - - 120 <0.50 <0.50 <0.50 <0.50 - - - - - - - - 0322193 14,55 60.28 0.00 -45.73 021304QO6 Tables 1-2.xls Page 11 of 24 SECOR