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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. pate p/Np TOC DTW SPH GWE GRO B T E X MTBE TBA DIPE ETRE TME Ethanol 1,2-DCA EDB D.O. Comments 01.6ssL) (leaf) (feet) (R-MSL) (11911.) (401L) (P01L) 11110W 111111116) (401L) (P911.) (491L7 (49/L) (491L) (49/L) 14ML1 1491L) MW-4 03/09/04 P 14.57 38.85 0.00 -24.28 <50 <0.50 <0.50 <0.50 <0.50 <0.50[2] <20 <1 .0 <1 .0 <1.0 <100 <0.50 - 1 .49 - 06/23/04 P 43.77 0.00 -29.20 <50 0.80 <0.50 <0.50 0.50 <0.50[2] <20 <0.50 <0.50 <0.50 <100 <0.50 - 2.59 - 09/20I04 P 47.95 0.00 33.38 <50 <2.5 <2.5 <2.6 <2.5 <2.5p] <100 <5.0 <5.0 <5.0 <500 <2.5 - 2.04 - 12/20/04 P 43.18 0.00 -28.61 <50 0.66 <0.50 <0.50 <0.50 1812] <20 <1 .0 <1 .0 <1 .0 <100 <0.50 - 2.74 - 0328/05 P 41 .50 0.00 -26.93 <50 <0.50 <0.50 <am <0.50 1 .7121 <20 <1 .0 <1 .0 <1.0 <100 <0.50 - 4.60 - 06/19/05 P 41 .55 0.00 -26.98 <50 <0.50 <0.50 <0.50 <0.50 <0.50[2] <20 <0.50 <0.50 <0.50 <100 UJ <0.50 - 2.80 - 09/11/05 P 45.77 0.00 31.20 <50 <0,50 40.50 <0.50 <0.50 <0.50[2] <20 <0.50 <0.50 <0.50 4100 0.86 - 1 .80 - " 12/12/05 P 43.24 0.00 -28.67 <50 <0.50 <0.50 <0.50 0.53 <0.50[2] <20 <0.50 <0.50 <0.50 <100 UJ <0.50 - 2.90 03/19/06 P 39.93 0.00 -25.36 <50 UJ <0.50 UJ <0.50 UJ <0.50 UJ <0.50 UJ <0.50 [2]UJ <20 UJ <0.50 UJ <0.50 UJ <0.50 UJ 4300 UJ <0.50 UJ - 2.20 - 06/13/06 P 39.60 0.00 -25.03 <50 <0.50 <0.50 <0.50 <0,50 <0.50 <20 <0.50 <0.50 <0.50 <300 <0.50 - 3.80 - 09/12/06 P 15.69 44.22 0.00 -28.53 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <20 <0.50 <0.50 <0.50 <300 0.73 - 2.00 - 12/13/06 P 42.15 9.00 -26AG 450 <0.50 4040 4030 40.50 <0.50 QO 40.50 40.50 <010 4300 <0.50 m 3.50 MW-5 08110/92 15. 10 64.84 0.00 -49.74 - - - - 1 1 - - - - - - - - 0828/92 - - - - 380 61 18 2.7 48 - - - - - - - - - - 09/15/92 - 15. 10 6495 0.00 49.85 - - - - - - - - - - - - - - - 10/0692 65.10 0.00 50.00 460 59 34 2.1 45 - - - - - - - - - IIII V92 64.40 0.00 49.30 - - - - - - - - - - - - - - 12/04/92 63.67 0.00 48.57 - - - - - - - - - - - - - - 01/20/93 - 62.39 0.00 47.29 79 9.2 1 .3 <0.60 4.2 - - - - - - - - - - 0322/93 60.51 0.00 45.41 - - - - - - - - - - - - - - - 04/06/93 - 60.01 0.00 44.91 1,600 260 150 12 230 - - - - - - - - - - 07/3M3 - 60.75 0.00 45.65 790 160 88 19 71 - - - - - - - - - - 1129193 - 59.77 0.00 44.67 9,600 11900 870 140 14300 - - - - - - - - - - 032394 - - _ - _ _ _ _ _ _ _ _ _ _ _ _ INA 0622/94 _ _ - - - - _ _ _ _ - - INA 0928/94 - - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ INA 10111/94 - 58.77 0.00 43.67 89 21 22 1 .8 5. 1 - - - - - - - - - - 12/01/94 - 57.70 0.00 4260 870 280 23 41 87 - - - - - - - - - - 02/2895 54.78 0.00 -39.68 310 70 1 .4 5.9 5.0 - - - - - - - - - - 05/1995 52.85 0.00 37.75 66 6.4 <0.50 0.50 <0.50 - - - - - - - - - - 082895 - 54.61 0.00 39.51 130 27 <0.50 4.5 0.130 - - - - - - - - - - 12/07/95 - 53.20 0.00 -38.10 <200" 2.1 <0.50 0.70 <0.50 - - - - - - - - - - 02/0596 50.67 0.00 35.57 <200" 3.0 <0.50 0.90 <0.60 - - - - - - - - - - 05/30M - 47.70 0.00 -32.60 140'^ 15 <0.50 5.2 <O.50 44.0" - - - - - - - - - 09/18/96 - 51 .56 0.00 -36.46 <300'" 33 <0.50 9.0 40.50 <3.0 - - - - - - - - - I V26/96 - 49.34 0.00 34.24 <200"' 1 .9 <0.50 0.50 <0.50 <4.0" - - - - - - - - - 0324/97 - 44.24 0.00 -29.14 <200" 3.2 <0.50 1 .6 3.0 <8.0" - - - - - - - - - 05/20/97 - 44.85 0.00 -29.75 270 31 5.0 5.0 15 <20" - - - - - - - - - 08/1997 48.37 0.00 93.27 100 20 <0M 3.8 <0.50 <5.0 - - - - - - - - - 11/1997 46.62 0.00 -31 .52 <50 1 .2 0.94 <0.50 0.91 <5.0 <100 <2.0 2.0 <2.0 02130 4Q06 Tables 1-2.xls Page 10 of 24 SECOR