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TABLE 2 GROUNDWA rER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration( /L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MWl l 08/19/98 10 15 <2 0* MWI 1 11/18/98 1015 2028 -1013 000 <05 <05 <05 <05 <50 <25 MWI 1 03/30/99 10 15 1826 -8 11 000 -- -- _- __ -- MWI 1 _MW11 05/05/99 10 15 1848 -833 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 M W 1 1 08/20/99 10 15 -- -- -- -- - MW 1 l 12/06/99 10 15 20 37 -1022 000 -- -- -- -- __ __ MW 11 02/29/00 10 15 1829 -8 14 000 <1 <1 <1 <1 <50 <1 MWI 1 05/16/00 10 15 1849 -834 000 -- -- -- -- __ -- MWI 1 09/11/00 10 15 -- -- -- MWI -MWI 1 12/13/00 10 15 -- -- -- --MWI 1 03/08/01 10 15 -- -- -- -- M W 1 1 06/21/01 10 15 -- -- -- -- -- MW11 09/20/01 10 15 2203 -1188 000 4 8 18 2 3 15 5 58 <0 5 MWI 1 11/08/01 10 15 <0 5 <0 5 <0 5 <0 5 <50 <0 5 1 W I 1 12/04/01 584 -- -- -- -- -- -- MW 12 01/30/91 9 16 3539 -2623 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW 12 05/02/91 9 16 3545 -2629 000 <0 3 <0 3 <0 3 <1 <50 -- MW 12 07116-17191 9 16 3637 -2721 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW 12 10/15/91 9 16 3695 -2779 000 <0 5 <0 5 <0 5 <0 5 <50 -- M W 12 01/28/92 9 16 3521 -2605 000 <0 5 0 6 <0 5 0 7 <50 -- MW 12 04/30/92 9 16 3483 -2567 000 <0 5 <0 5 <0 5 <0 5 <50 -- M W 12 08/13/92 9 16 3682 -2766 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW12 10/08/92 9 16 3754 -2838 000 <0 5 <0 5 <0 5 <0 5 <50 -- M W 12 02/23/93 9 16 3445 -2529 000 <0 5 <0 5 <0 5 <0 5 <50 -- M W 12 05/18/93 9 16 Not Accessible -- -- -- __ __ M W 12 08/22/93 9 16 Not Accessible MW 12 12/30/93 9 16 Not Accessible MW 12 02/17/94 9 16 Not Accessible -- -- -- __ __ MW 12 05/10/94 9 16 3105 -2189 000 <0 5 <0 5 <0 5 <0 5 <50 -- M W 12 08/02/94 9 16 3255 -2339 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW 12 11/01/94 9 16 3303 -23 87 000 <0 5 <0 5 <0 5 <0 5 <50 -- L�pin3cds'73942hnastLrm ply 120[13942ew xis Page 19 of 40