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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(Eg/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene X Imes TPH MTBE MW 11 07116-17191 1015 3938 -2923 000 <0 5 <0 5 <0 5 <0 5 <50 -- M W I 1 10/15/91 10 15 3994 -2979 000 <0 5 <0 5 <0 5 <0 5 <50 -- M W 11 01/28/92 10 15 3808 -2793 000 <0 5 <0 5 <0 5 <0 5 <50 M W 11 04/30/92 1015 3772 -2757 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW I 1 08/13/92 1015 3994 -2979 000 <0 5 <0 5 <0 5 <0 5 <50 -- M\t,11 10/08/92 1015 4070 -3055 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW I l 02/23/93 10 15 3728 -27 13 000 <0 5 <0 5 <0 5 <0 5 <50 - M W I I 05/18/93 10 15 -- -- -- -- __ __ __ MW 11 08/22/93 10 15 36 19 -2604 000 MW I 1 12/30/93 1015 Not accessible -- -- -- __ -- __ MW 1 1 11/11/97 1015 2483 -1468 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MWII 11/11/97 10 15 <2 0* M W I 1 03/03/98 10 15 20 11 -996 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 M W I l 03/03/98 10 15 <2 0* MW 11 05/20/98 1015 1858 -843 000 <0 5f <0 5f <0 5f <0 5f <50f <2 5f MW11 05/20/98 1015 <2 0* M W 11 08/19/98 1015 1994 -979 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW1 1 08/19/98 10 15 <2 0* MWl l 11/18/98 1015 2028 -1013 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW 11 03/30/99 10 15 1826 -8 11 000 -- -- -- __ __ __ M W I 1 05/05/99 1015 1848 -833 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 M W l 1 08/20/99 10 15 -- -- __ __ M W l 1 12/06/99 10 15 2037 -1022 000 -- -- MW l 1 02/29/00 1015 1829 -8 14 000 <1 <1 <1 <1 <50 <1 MWl 1 05/16/00 10 15 1849 -834 000 -- -- __ __ __ __ MWII 09/11/00 1015 -- -- __ MWII 12/13/00 1015 M W I l 03/08/01 1015 M W I 1 06/21/01 10 15 -- -- -- -- -- __ -- -- -- MW I 1 09/20/01 10 15 2203 -1188 000 48 18 23 155 58 <0 5 MW11 11/08/01 10 15 <0 5 <0 5 <0 5 <0 5 <50 <0 5 MW11 12/04101 584 -- -- __ __ __ g/projects1739421iiiasterlwp1g0304\3942gw xis Pabe 23 of 52