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TABLE 2 GROUNDWATER 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. TP14-g MTBF, MW L 1 03/06/02 5 84 102* j MW 11 06/11/02 584 -- -- __ __ MW11 09/10/02 584 MW I 1 12/18/02 5 84 MWl I 03/24/03 584 -- Not Accessible -- -- -- -- -- -- -- MW11 06/11/03 5 84 2223 -1639 000 <0 5 <0 5 <0 5 <0 5 <50 h <0 5 MW i l 09/17/03 584 - - -- __ __ __ __ __ MW 11 12/08/03 584 - -- __ __ __ __ __ -- MW 11 03/02/04 584 2227 -1643 000 <0 5 <0 5 <0 5 <0 5 <50 h <0 5 MW11 06/28/04 5 84 -- __ __ __ __ __ __ MW 11 09/27/04 5 84 MW11 12/01/04 584 -- -- __ MW 11 03/24/05 5 84 2232 -1648 000 -- -- -- -- -- -- MW 11 03/25/05 5 84 -- -- -- <0 5 <0 5 <0 5 <0 5 <50 h <0 5 MW11 06/22/05 584 — -- _ — _ _ — _ -- 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 -- MW12 07/16-17/91 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 -- MW 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 -25 67 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW 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 -- MW 12 02/23/93 9 16 3445 -2529 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW12 05/18/93 9 16 Not Accessible -- -- -- -- __ MW12 08/22/93 916 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 -- MW 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 -2387 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW 12 02/17/95 9 16 3057 -2141 000 <0 5 <0 5 <0 5 <0 5 <50 -- g\projects1739421masterlwp\gO6O513942gw xis Page 26 of 59