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TABLE 1-SUMMARY OF RESULTS OF GROUNDWATER SAMPLING BP OIL COMPANY SERVICE STATION NO.11193 3202 WEST HAMMER LANE,STOCKTON,CALIFORNIA ALISTO PROJECT N0.10-136 WELL DATE OF CASING DEPTH TO GROUNDWATER TPH-G TPH-D TPH B T E X MTBE HVOC DO LAB ID SAMPLING/ ELEVATION(a) WATER ELEVATION (b) (ugA) (ug4) (M) MA) (M) (ug l) (UO4) (UP (Ug l) (ppm) MONITORING (F=eet) (Feet) (Feet) MW-5 04/25/94 4.38 17.40 -13.02 170 - - 34 1.0 ND<0.5 8.1 - - 3.9 PACE MW-5 07/28/34 4.38 17.86 -13.48 1000 - - 440 19 10 38 - - 3.9 PACE O0-1 (c) 07/28/94 --• -- -- 1200 - - 470 23 11 46 --- -- - PACE MW-5 12!09/94 4.38 18.34 -13.96 930 - - 260 5.3 31 21 --- --- 4.6 PACE OC-1 (c) 12/09/94 -- - -- 1000 --- --- 280 6 34 24 - - --- PACE MW-5 03/03/95 4.38 16.99 -12.61 1200 --- --- 450 7.4 5.9 28 - - 5.4 ATI MW-5 04/12/95 4.38 15.71 -11.33 ND<50 --- - 9.0 ND<0.50 2.6 1.5 -- - 7.9 ATI MW-5 07/20/95 4.38 16.00 -11.62 4100 --- --- 220 ND<5.0 28 NN10 -- -- 6.7 ATI MW-5 111021'95 4.38 16.90 -12.52 220 -- - 44 1A 8.7 7.4 ND<5.0 - 3.6 ATI MW-5 01116196 4.38 16.27 -11.89 160 -- - 47 3.0 13 11 ND<5.0 -- - ATI MW-5 04!27156 4.38 14.17 -9.79 100 - - 48 3 6 11 ND<10 -- - SPL MW-5 07/12196 4.38 14.46 -10.08 960 -- - 320 3.8 78 42.2 31 --- 2.9 SPL MW-5 11/14116 4.38 15.36 -10.98 560 - -- 180 ND<7.0 49 17 19 - 3.1 SPL MW-6 04/25/94 3.56 16.73 -13.17 53 -- - ND<0.5 ND<0.5 0.6 2.4 - --- 2.0 PACE MW-6 07/28194 3.56 17.20 -13.64 69 -- - ND<0.5 ND<0.5 ND<0.5 ND<0.5 - --- 2.2 PACE MW-6 12/09/94 3.56 17.70 -14.14 ND<50 --- --- ND<0.5 ND<0.5 ND<0.5 ND MW-6 03/03/95 3.56 16.34 -12.78 ND<50 -- -- 0.83 ND<0.50 ND<0.50 ND<1.0 - -- 4.3 An MW-6 04/12/95 3.56 15.05 -11.49 57 --- --- ND<0.50 0.52 ND<0.50 ND<7.0 - -- 4.6 ATI MW-6 07/20/95 3.56 15.37 -11.81 ND<50 --- --- ND<0.50 ND<0.50 ND<0.50 ND<1.0 - -- 7.3 All MW-6 11102/95 3.56 16.24 -12.68 ND<50 - - ND<0.5 ND<0.5 ND<0.5 ND<1.0 65 --- 4.3 ATI MW-6 01/16196 3.56 15.65 -12.09 ND<50 --- --- ND<0.50 ND<0.50 ND<0.50 ND<1.0 89 -- - ATI MW-6 04)22196 3.56 13.53 -9.97 NO<50 - --- ND<0.5 ND<l ND MW-6 07/12/36 3.56 13.85 -10.29 ND<50 - - ND<0.5 ND<1 ND MW-6 11/14/96 3,56 14.75 -11.19 80 - - ND<0.5 ND<1.0 ND<1.0 2.1 64 - 3.9 SPL MW-7 04/25/94 4.46 17.59 -13.13 76 - - 1.0 ND<0.5 ND<0.5 2.0 --- --- 4.7 PACE MW-7 07/28/94 4.46 18.06 -13.60 67 -- 6.8 ND<0.5 ND<0.5 ND<0.5 --- --- 4.6 PACE MW-7 12109/94 4.46 18.78 -14.32 57 - - 5.1 0.5 ND<0.5 ND MW-7 03103/95 4.46 17.40 -12.94 ND<50 - - 5.8 ND<0.50 ND<0.50 ND<1.0 -- --- 4.3 ATI MW-7 04/12/95 4.46 16.29 -11.83 ND<50 - - 4.6 ND<0.50 ND<0.50 N130.0 - -- 7.8 ATI MW-7 07120/95 4.46 16.26 -11.80 ND<50 - - 3.1 ND<0.50 ND<0.50 ND<1.0 - - 5.3 ATI MW-7 11/02195 4.46 17.10 -12.64 ND<50 - - 3.4 ND<0.5 ND<0.5 NDc1.0 ND<5.0 - 4.2 ATI MW-7 01/16/36 4.46 16.44 -11.98 ND<50 - - 4.6 ND<0.50 ND<0.50 N130.0 ND<5.0 --- --- ATI MW-7 04/22196 4.46 14.27 -9.81 ND<50 - - 2.0 ND<7 ND MW-7 0711M 4.46 14.67 -10.21 ND<50 - - ND<0.5 ND MW-7 11/14/96 4.46 15.60 -11.14 ND<50 --- - ND<0.5 ND<1.0 ND<1.0 ND<i3O ND<10 -- 3.2 SPL 02-Jan-97 PAGE 3