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0 TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH _ Concentration(pg/L) Well Elevation to Water Elevation Thickness Ethyl Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW12 02/17/94 916 Not Accessible -- -- MW12 _MW12 05/10/94 916 31 05 -2189 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW 12 08/02/94 916 3255 -2339 000 <0 5 <0 5 <0 5 <0 5 <50 -- M W 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 MW12 05/11/95 9 16 2765 -1849 000 <0 5 <0 5 <0 5 <0 5 <50 -- M W 12 08/24/95 9 16 2851 -1935 000 <0 5 <0 5 <0 5 <0 5 <50 MW12 10/19/95 9 16 2888 -1972 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW12 02/13/96 9 16 2665 -1749 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW12 04/18/96 9 16 24 12 -1496 000 -- -- -- MW12 _MW12 08/08/96 916 24 93 -1577 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW12 11/04/96 916 2531 -1615 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW12 02/03/97 916 2103 -1187 000 -- __ -- MW12 05/08/97 8 75 2000 -1125 000 MW12 08/26/97 875 2163 -1288 000 -- -- -- MW12 _MW12 11/11/97 875 2228 -1353 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW12 03/03/98 875 1705 -830 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW12 03/03/98 875 <2 0* MW12 05/20/98 875 1623 -748 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW12 05/20/98 875 <2 0* MW12 08/19/98 875 1758 -8 83 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW12 08/19/98 875 <2 0* MW12 11/18/98 8 75 18 10 -935 000 -- -- -- MW12 _MW12 03/30/99 8 75 1630 -755 000 -- -- -- MW12 MW12 05/05/99 875 1644 -769 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 MW12 08/20/99 8 75 -- -- MW12 _MW12 12/06/99 875 - MW 12 02/29/00 875 -- -- MW12 _MW12 05/16/00 8 75 1628 -753 000 MW12 09/11/00 875 -- MW12 -MW12 12/13/00 875 -- __ __ M W 12 03/08/01 875 1730 -855 000 <0 5 <0 5 <0 5 4 5 <50 <0 5 g%projects\73942\mastcr\w p\g0603\3942gw x1s Page 23 of 48