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0 i 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) (UgR) (ugA) (ppm) MONITORING (Feet) (Feet) (Feet) MW-6 08/05/91 5.80 29.82 -24.02 ND ND ND ND ND - --- PRE MW-0 08/15/91 5.80 - -- -- - - - --- - - MW-6 12/09/91 5.80 30.42 -24.62 ND ND ND ND ND - --- PRE MW-0 03/09/92 5.80 29.53 -23.73 ND ND ND ND ND - - PRE MW-6 06/19/92 5.80 29.24 -23.44 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 -- - ANA MW-0 09/18/92 5.80 31.03 -25.23 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 -- - ANA MW-6 12/09/92 5.80 31.42 -25.62 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - ANA MW-0 03/11/93 5.80 28.95 -23.15 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - PACE MW-6 06/15/93 5.80 26.91 -21.11 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - PACE MW-6 09/15/93 5.80 27.29 -21.49 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - -- PACE MW-0 12/22/93 5.60 27.17 -21.37 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - PACE MW-6 04/01/94 5.80 26.29 -20.49 - -- - -- - - ~- MW-0 07/27/94 5.60 26.32 -20.52 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 -- 3.6 PACE MW-6 11/30/94 5.80 26.80 -21.00 -- - - - -- MW-6 02/15/95 5.80 25.73 -19.93 ND<50 ND<0.50 ND<0.50 ND<0.50 ND<1.0 -- 3.9 ATI MW-6 04121/95 5.80 23.74 -17.94 - - - - -- - - MW-6 07/21/95 5.80 22.98 -17.18 ND<50 ND<0.50 ND<0.50 ND<0.50 ND<1.0 -- 6.3 All MW-6 (e) 10/20/95 5.80 23.39 -17.59 ND<50 ND<0.50 ND<0.50 ND<0.50 ND<1.0 6.7 7.3 ATI MW-0 10/20/95 5.80 -- -- ND<50 1.5 0.67 ND<0.50 ND<1.0 ND<5.0 6.5 ATI MW-6 (e) 04/23/96 5.80 20.00 -14.20 ND<500 ND<5 ND<5 ND<5 13 2700 --- SPL MW-6 04/23/96 5.80 - -- ND<500 ND<12 ND<12 ND<12 ND<12 4100 -- SPL MW-0 07/12/96 5.80 20.22 -14.42 --- --- - - -- - -- MW-6 10/18/96 5.80 19.42 -13.62 2300 10 ND<1.0 ND<1.0 ND<1.0 7940 4.4 SPL MW-0 02/26/98 5.80 11.60 -5.80 490 ND<0.5 ND<1.0 ND<1.0 ND<1.0 590 4.9 SPL QC-1 (d) 02/26/98 -- --- --- 460 ND<0.5 ND<1.0 ND<1.0 ND<1.0 680 -- SPI, MW-0 07/07/98 5.80 11.55 -5.75 ND<50 ND<0.5 ND<1.0 ND<1.0 ND<1.0 ND<10 3.7 SPL 08-OCI.98 PAGE 5 i