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TABLE 1-SUMMARY OF RESULTS OF GROUNDWATER SAMPLING BP OIL COMPANY SERVICE STATION 140.11193 3202 WEST HAMMER LANE,STOCKTON,CALIFORNIA ALISTO PROJECT NO.10.136 i WELL DATE OF CASING DEPTH TO GROUNDWATER TPH�G TPH-D TPH B T E X MTBE 14VOC DO LAB ID SAMPLING/ ELEVATION(a) WATER ELEVATION (b) (ugA) (uw) (kJo) MA) (ugA) (u911) (ugA) (uo) (ugA) (ppm) MONITORING (Feet) (Feet) (Feet) MW-3 12/21/92 5.15 21.52 -16.37 170 - 2.8 ND<0.5 ND<0.5 ND<0.5 --- - MW-3 04104!93 5.15 18.59 -13.44 270 - - 23 ND<0.5 ND<0.5 ND<0.5 - - PACE MW-3 0412653 5.15 18.34 -13.19 -- - - - - - - - - - MW-3 10/05/93 5.15 19.10 -13.95 920 - 80 ND<0.5 ND<0.5 1.o - - - PACE MW,3 01/07/94 5.15 18.82 -13.67 130 - - 12 ND<0.5 ND<0.5 1.5 - PACE • MW-3 04/201114 5.15 18.07 -12.92 99 (d) - - 2.6 ND<0.5 ND<0.5 ND<0.5 - - 3.8 PACE MW-3 04/25/94 5.15 18.04 -12.89 -- - - --- -- - - - MW-3 07/2&94 5.15 18.50 -13.35 360 - - 46 0.9 0.9 2.1 - 3.6 PACE MW-3 12/09194 5.15 18.99 -13.84 610 --- - 140 2.9 3.4 2.8 3.9 PACE MW-3 03/03195 5.15 17.62 -12.47 ND<50 - - 2.3 ND<0.50 ND<0.50 ND<1.0 - 4.7 ATI MW-3 04/12/95 5.15 16.34 -11.19 ND<50 - - 0.75 0.89 ND<0.50 ND<1.0 - - 8.1 ATI MW-3 07/20195 5.15 16.72 -11.57 230 - - 4.5 ND<0.50 ND<0.50 ND<1.0 - --- 7.9 ATI MW-3 11/02/95 5.15 17.56 -12.41 ND<50 - - 0.81 ND<0.5 0.51 ND<1.0 640 - 42 ATI MW-3 01/16/96 5.15 16.90 -11.75 86 - ND<0.50 ND<0.50 ND<0.50 ND<1.0 270 - - ATI MW-3 04/22/96 5.15 14.84 -9.69 ND<50 - - ND<0.5 ND MW-3 07/12196 5.15 15.13 -9.98 ND<50 - --- ND<0.5 ND<t ND MW-3 11/14/96 5.15 16.01 -10.86 ND<50 - - ND<0.5 ND<1.0 ND<1.0 ND<1.0 ND<10 --- 3.4 SPL MW-4 121211'92 5.43 21.68 -1625 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) 04/04/93 - --- --- 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 10/05/93 5.43 19.30 -13.87 140 ND<50 ND<5000 ND<0.5 ND<O.S 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 01/07/94 5.43 19.05 -13.62 100 - ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - - PACE MW-4 04/201'94 5.43 18.31 -12.88 74 - --- ND<0.5 ND<0.5 ND<0.5 1.3 - 4.1 PACE MW-4 04/25/94 5.43 18.28 -12.85 --- - - - - --- MW-4 07/2854 5.43 18.71 -13.28 66 --- -- ND<0.5 ND<0.5 ND<0.5 ND<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<1.0 7.9 AT1 MW-4 07/20/95 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 11/02195 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-4 01/16/96 5.43 17.21 -11.78 ND<50 - - ND<0.50 ND<0.50 ND<0.50 ND<1.0 ND<5.0 - --- ATI (� MW-4 04/22/96 5.43 15.11 -9.68 ND<50 - ND<0.5 ND<1 ND<1 ND<1 ND<10 - SPL MW-4 07/12/96 5.43 15.42 -9.99 ND<50 - - ND<0.5 ND<1 ND MW-4 11/14/96 5.43 16.30 -10.87 ND<50 - - ND<0.5 ND<1.0 ND<1.0 ND<1.0 ND<10 --- 3.4 SPL 02-Jan-97 PAGE 2