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TABLE 1-SUMMARY OF RESULTS OF GROUNDWATER SAMPLING BP OIL COMPANY SERVICE STATION NO.11192 1403 COUNTRY CLUB BOULEVARD,STOCKTON,CALIFORNIA ALISTO PROJECT NO.10-037 WELL DATE OF CASING DEPTH TO GROUNDWATER TPH-G B T E X MTBE DO LAB ID SAMPLING/ ELEVATION (a) WATER ELEVATION (b) (UgA) (ugA) (ugA) (ugA) (ugA) (ugA) (ppm) MONITORING (Feet) (Feet) (Feet) MWA 05/01/90 6.75 26.31 -19.56 ND ND ND ND ND - --- PRE MW-4 08/05/91 6.75 DRY - -- - --- -- -- - PRE MWA 12109/91 6.75 DRY - - - -- - -- PRE MWA 03/09/92 6.75 DRY - -- - - - - - ANA MW-4 06/19/92 6.75 DRY --- -- - - - - - ANA MWA 09/18/92 6.75 DRY - - -- - - - - ANA MW-4 12/09/92 6.75 DRY - -. - - --- -- --- ANA MWA 03/11/93 6.75 DRY --- - -- - - - __ PACE MW4 06/15/93 6.75 28.01 -21.26 -- --- -_ - - -- - PACE MW-4 09/15/93 6.75 28.50 -21.75 - - - - -- --- -- PACE MWA 12222/93 6.75 28.33 -21.58 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - PACE MW-4 04/01/94 6.75 27.45 -20.70 --- - - - - - - - MW-4 07/27/94 6.75 27.46 -20.71 190 ND<0.5 ND<0.5 ND<0.5 ND<0.5 2.3 PACE MWA 11/30/94 6.75 27.97 -21.22 --- - - - -- - - MW-0 02/15/95 6.75 26.85 -20.10 ND<50 ND<0.50 ND<0.50 ND<0.50 ND<1.0 2.8 ATI MW-4 04/21/95 6.75 24.77 -18.02 --- - - -- -- MWA 07/19/95 6.75 24.07 -17.32 ND<50 ND<0.50 ND<0.50 ND<0.50 ND<1.0 - 5.1 ATI MWA (e) 10/20/95 6.75 24.50 -17.75 ND<50 ND<0.50 ND<0.50 ND<0.50 ND<1.0 ND<5.0 6.0 AT] MWA 10/20/95 6.75 25.24 -18.49 N0<50 ND<0.50 ND<0.50 ND<0.50 ND<1.0 ND<5.0 6.5 An MWA (e) 04/23/96 6.75 21.13 -14.38 ND<500 ND<0.5 ND<0.5 ND<0.5 ND<0.5 14 --- SPL MWA 04/23/96 6.75 --- --- ND<500 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<10 --- SPL MW-4 07/12/96 6.75 20.42 -13.67 -- -- --- --- - - -- MWA 10/18/96 6.75 19.63 -12.88 130 ND<0.5 ND<1.0 ND<1.0 ND<1.0 ND<10 5.3 SPL MWA 02/26/98 6.75 13.01 -0.26 ND<50 ND<0.5 ND<1.0 ND<1.0 ND<1.0 ND<10 4.4 SPL MWA 07/07/98 6.75 12.61 -5.86 ND<50 ND<0.5 ND<1.0 ND<1.0 ND<1.0 ND<10 3.7 SPL 08-Oct-98 PAGE 3