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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 MW11 07116-17191 1015 3938 -2923 000 <0 5 <0 5 <0 5 <0 5 <50 -' MW I 1 10/15/91 1015 3994 -2979 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW I I 01/28/92 1015 3808 -2793 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW I 1 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 -- MW 11 10/08/92 1015 4070 -3055 000 <0 5 <0 5 <0 5 <0 5 <50 MMI 02/23/93 1015 3728 -27 13 000 <0 5 <0 5 <0 5 <0 5 <50 -- MWI1 05/18/93 1015 -- -- __ __ __ MW 11 08/22/93 1015 36 19 -2604 000 MW11 12/30/93 1015 Not accessible -- __ __ __ MW 11 11/11/97 10 15 2483 -1.4 68 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW I 1 11/11/97 1015 <2 0* MW 11 03/03/98 1015 2011 -996 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW 11 03/03/98 10 15 <2 0* MW 1 I 05/20/98 10 15 1858 . -843 000 <0 5f <0 5f <0 5f <0 5f <50f <2 5f MW 11 05/20/98 1015 <2 0* MW I I 08/19/98 1015 1.9 94 -979 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 M W 11 08/19/98 1015 <2 0* MW11 11/18/98 1015 2028 -1013 000 <05 <05 <05 <05 <50 <25 MW 1 L 03/30/99 1015 1826 -8 11 000 -- -- __ __ __ MW 11 05/05/99 10 15 t8 48 -833 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 MW11 08/20/99 1015 -- -- __ __ __ MW i 1 12/06/99 1015 2037 -1022 000 -- -- -_ __ __ MW l l 02/29/00 1015 1829 -8 14 000 <1 <t <1 <L <50 <1 MW l 1 05/16/00 1015 1849 -834 000 -- -- __ __ __ MW11 09/11/00 1015 -- _- __ MWI1 12/13/00 10 t5 _- MW 11 03/08/01 1015 MW I 1 06/21/01 1015 -- -- __ -- MW I 1 09/20/01 1015 2203 -1188 000 48 18 2 3 155 58 <0 5 MW 11 11/08/01 1015 <0 5 <0 5 <0 5 <0 5 <50 <0 5 MW l l 12/04/01 5 84 -- -- __ __ __ MW11 03/06/02 5.84 2087 -15.03 000 <0 5 <0 5 <0 5 <0 5 <50 h 0 80 MW11 03/06/02 5.84 1.02* glprojects173942UnasteAwp430213942gw xls Page 18 of 39