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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 TPH-g MTBE - MW10 03/03/98 729 1630 -901 000 360 7,800 1,300 5,000 23,000 940 MW10 03/03/98 729 <200* MW10 05/20/98 729 1562 -8 33 000 8 1 85 11 100 630 <5 0 MW10 05/20/98 729 <2 0* MW l0 08/19/98 729 1706 -977 000 077 <0 5 <0 5 <0 5 <50 <2 5 MW 10 08/19/98 729 <2 0* MW10 11/18/98 729 1747 -1018 000 <05 <05 <05 <05 <50 <25 MW10 03/30/99 729 1554 -825 000 -- -- -- __ -- MW10 _MW10 05/05/99 729 15 84 -8 55 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 MW10 08/20/99 729 -- -- -- -- -- MW l0 12/06/99 729 1766 -1037 000 -- -- -- -- -- MW10 -MW10 02/29/00 729 1534 -805 000 <1 <1 <1 <1 <50 <1 MW10 05/16/00 729 1542 -8 13 000 -- -- -- -- MW10 09/11/00 729 1743 -1014 000 0 8 2 <0 5 197 50 <0 5 MW10 12/13/00 729 1729 -1000 000 <05 <05 <05 <05 62 <05 MW10 03/08/01 729 1654 -925 000 <0 5 <0 5 <0 5 <0 5 78 <0 5 MW l0 06/21/01 729 1792 -1063 000 <0 5 <0 5 <0 5 <0 5 <50 12 MW10 06/21/01 729 <5* MW10 09/20/01 729 1911 -11 82 000 -- -- -- -_ -- MW10 -MW10 12/04/01 725 1989 -1164 000 -- -- -- -- -- MW10 -MW10 03/06/02 725 1790 -1065 0 00 3 10 <0 5 <0 5 <0 5 369 h 14 0 MW10 03/06/02 725 <0 5* MW 10 06/11/02 725 -- -- -- -- M W I 0 09/10/02 725 MW10 12/18/02 725 -- -- __ -- -- -- -- -- -- i MW10 03/24/03 725 1226 -501 000 3 50 <0 5 <0 5 <0 5 541 h 8 6 MW10 03/24/03 725 <0 5* MW I I 05/02/91 1015 3839 -2824 000 <0 3 <0 3 <0 3 <1 <50 -- MW 11 07116-17191 10 15 3938 -2923 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW i 1 10/15/91 10 15 3994 -2979 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW I 1 01/28/92 1015 3808 -2793 000 <0 5 <0 5 <0 5 <0 5 <50 -- I g 1projects173942Lnasterlwp\g0303U942hw zls Pabe 20 of 47