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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(µg/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date feet feet feet feet Benzene Toluene benzene Xylenes TPH-g MTBE MW12 05/10/94 9 16 3105 -2189 000 <0 5 <0 5 <0 5 <0 5 <50 MW12 08/02/94 916 3255 -2339 000 <0 5 <0 5 <0 5 <0 5 <50 MW12 11/01/94 9 16 3303 -23 87 000 <0 5 <0 5 <0 5 <0 5 <50 MW12 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 MW12 08/24/95 9 16 2851 -1935 0 00 <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 2412 -1496 000 -- -- -- -- -- -- MW12 08/08/96 9 16 2493 -1577 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW12 11/04/96 9 16 2531 -16 15 0 00 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW12 02/03/97 916 2103 -1187 000 -- -- -- -- -- -- MW12 05/08/97 875 2000 -1125 000 -- -- -- --MW12 08/26/97 875 2163 -1288 000 -- -- -- -- -- -- 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 -883 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW12 08/19/98 875 <2 0* MW12 11/18/98 875 1$ 10 -935 000 -- -- -- -- -- -- MW12 03/30/99 875 1630 -755 000 -- -- -- -- -- -- MW12 05/05/99 875 1644 -769 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 MW12 08/20/99 875 -- -- -- -- -- -- -- -- -- MW12 12/06/99 875 -- -- -- -- -- -- --MW12 02/29/00 875 -- MW12 -MW12 05/16/00 875 1628 -7 53 000 -- -- -- -- -- MW12 09/11/00 875 -- -- MW12 -MW12 12/13/00 875 -- -- -- -- -- -- MW12 03/08/01 875 1730 -855 000 <0 5 <0 5 <0 5 4 5 <50 <0 5 MW12 06/21/01 8 75 1862 -987 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 grprojects1739425maskrlwp1g0904U942gw xls Page 26 of 56