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i TABLE 2 GROUNDWATER MONITORING DATA, FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA I Casing Depth Groundwater LPH Concentration(Icg1L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes -_TPH-g MTBE M W 11 11/11/97 10 15 24 83 -1468 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW I 1 11/11/97 1015 <2 0* MW I 1 03/03/98 1015 20 t l -996 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW i l 03/03/98 1015 <2 0* MW I t 05/20/98 10 15 1858 -843 000 <0 51' <0 5f <0 5f <0 5f <50f <2 5f MWI,l 05/20/98 1015 <2 0* MWII 08/19/98 1015 1994 -979 000 <05 <05 <05 <05 <50 <25 MW I l 08/19/98 10 15 <2 0* MW I l 11/18/98 1015 2028 -1013 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 M W I 1 03/30/99 1015 1826 -8 11 000 -- -- -- -- -- -- M W l 1 05/05/99 10 15 1848 -8 33 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 M W l 1 08/20/99 1015 -- -- -- -- -- -- -- -- -- M W 11 12/06/99 1015 2037 -1022 000 -- -- -- -- -- -- MW l 1 02/29/00 10 15 1829 -8 14 000 <1 <1 <1 <1 <50 <1 M W I 1 05/16/00 10 15 1849 -834 000 -- -- -- -- -- -- M W l 1 09/11/00 1015 -- -- -- M W 11 12/13/00 10 15 MW I l 03/08/01 10 15 MW 1 l 06/21/01 1015 -- -- -- -- -- -- -_ __ M W 1 l 09/20/01 10 15 2203 -1188 000 4 8 18 2 3 155 58 <0 5 MW 1 1 11/08/01 10 15 <0 5 <0 5 <0 5 <0 5 <50 <0 5 M W I 1 12/04/01 584 -- -- -- -- -- -- __ __ -_ MW I 1 03/06/02 5 84 2087 -1503 000 <0 5 <0 5 <0 5 <0 5 <50 h 0 80 MW I I 03/06/02 5 84 102* MW I l 06/11/02 5 84 -- -- -- -- __ -- __ -- __ M W l 1 09/10/02 5 84 M W t 1 12/18/02 584 MW 11 03/24/03 584 -- Not Accessible -- -- -- -- -- -- __ MW l 1 06/11/03 5 84 2223 -1639 000 <0 5 <0 5 <0 5 <0 5 <50 h <0 5 M W 11 49/17/03 5 84 M2 01130/91 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 07116-17/91 9 16 3637 -2721 000 <0 5 <0 5 <0 5 <0 5 <50 -- 9 llpmjetls1739421mJS(Lrku pXgU)03L3942gw xls Page 21 of 47