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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 NO.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) (ucgl) (ugA) (ugA) (UgA) NO) (ugA) (ug4) (ugA) (ppm) MONITORING (Feet) (Feet) (Feet) MW-4 12/21/92 5.43 21.68 -16.25 110 - --- ND<0.5 ND<0.5 ND<0.5 ND<0.5 --- --- MW-4 04/04/93 5.43 18.80 -13.37 180 1.1 ND<0.5 ND<0.5 0.9 --- ND (e) - PACE QC-1 (c) 04/04193 - --- --- 310 1.9 ND<0.5 ND<0.5 0.9 -- - PACE MW-4 04/26/93 5.43 18.55 -13.12 -- ND<50 ND<5000 --- - - - - MW-4 10/05793 5.43 19.30 -13.87 140 ND<50 ND<5000 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - ND (e) PACE QC-1 (c) 10/05/93 - --- --- 160 - --- ND<0.5 ND<0.5 ND<0.5 ND<0.5 --- - - PACE MW-4 01/07194 5.43 19.05 -13.62 100 - - ND<0.5 ND<0.5 ND<0.5 ND<0.5 --- - PACE MW-4 04/20194 5.43 18.31 -12.88 74 - - ND<0.5 ND<0.5 ND<0.5 1.3 --- - 4.1 PACE MW-4 04/25194 5.43 18.28 -12.85 --- - - - -- ... --- -- MW-4 07/28/94 5.43 18.71 -13.28 66 - ND<0.5 ND<0.5 ND<0.5 190<0.5 --• 4.0 PACE MW-4 12/09/94 5.43 19.20 -13.77 50 --- - ND<0.5 ND<0.5 ND<0.5 ND<1 -- 4.4 PACE MW-4 03/03/95 5.43 17.87 -12.44 ND<50 --- - ND<0.50 ND<0.50 ND<0.50 ND<1.0 --- 4.6 ATI MW-4 04/12/95 5.43 16.59 -11.16 ND<50 --- - ND<0.50 ND<0.50 ND<0.50 ND<i-0 - 7,9 ATI MW-4 07124!95 5.43 16.97 -11.54 ND<50 - --- ND<0.50 ND<0.50 ND<0.50 ND<1.0 - - 4.6 ATI MW-4 11/02/95 5.43 17.81 -12.38 ND<50 --- -- ND<0.5 ND<0.5 ND<0.5 ND<1.0 ND<5.0 - 4.1 ATI 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 07/28/94 4.38 17.86 -13.48 1000 --- 440 19 10 38 - - 3.9 PACE OC-1 (c) 07128194 - - - 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 QC-1 (c) 12/09194 -- - - 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 07/20795 4.38 16,00 -11.62 4100 - 220 ND<5.0 28 ND<10 - - 6.7 ATI MW-5 11/02/95 4.38 16.90 -12.52 220 - 44 1.4 8.7 7.4 ND<5.0 --- 3.6 ATI MW-6 04/25194 3.56 16.73 -13.17 53 - - ND<0.5 ND<0.5 0.6 2.4 --- -- 2.0 PACE MW-6 07/28/94 3.56 17.20 -13.64 69 - - ND<0.5 ND<0.5 ND<0.5 ND<0.5 --- --- 2.2 PACE MW-6 12109!94 3.56 17.70 -14.14 ND<50 - - ND<0.5 ND<0.5 ND<0.5 ND<1 -- --- 3.5 PACE 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 ATI MW-6 04/12/95 3.56 15.05 -11.49 57 --- - ND<0.50 0.52 ND<0.50 ND<1.0 - - 4.6 ATI MW-6 07120+95 3.56 15.37 -11.81 ND<50 - --- ND<0.50 ND<0.50 ND<0.50 ND<1.0 -- 7.3 ATI MW-6 11/02/95 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-7 04/25194 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 12/09/94 4.46 18.78 -14.32 57 - - 5.1 0.5 ND<0.5 ND MW-7 03/03/95 4.46 17.40 -12.94 ND<50 --- - 5.8 ND<0.50 ND<0.50 ND<1.0 - - 4.3 ATI MW-7 04/12195 4.46 16.29 -11.83 ND<50 --- - 4.6 ND<0.50 ND<0.50 ND<1.0 - - 7.8 ATI MW-7 07/20/95 4.46 16.26 -11.80 ND<50 - - 3.1 ND<0.50 ND<0.50 ND<1.0 --- -- 5.3 ATI MW-7 11/02/95 4.46 17.10 -12.64 ND<50 - - 3.4 NO<0.5 ND<0.5 ND<1.0 ND<5.0 - 4.2 ATI 24Jan-96 PAGE 2