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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 (,ug/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW 11 05/18/93 1015 -- _- __ MW 11 08/22/93 1015 3619 -2604 000 MW 11 12/30/93 1015 Not accessible -- -- __ __ __ MW11 11/11/97 1015 2483 -1468 000 <05 <05 <05 <05 <50 <25 MW11 11/11/97 1015 <20* MW 11 03/03/98 1015 20 11 -996 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW 11 03/03/98 1015 <2 0* MW 11 05/20/98 1015 1858 -843 000 <0 5f <0 5f <0 51' <0 5f <50f <2 5f MW11 05/20/98 1015 - <2 0* MW 1 I 08/19/98 10 I5 1994 -979 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW11 08/19/98 1015 <2 0* MW I 1 11/18/98 1015 2028 -1013 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 M W 11 03/30/99 1015 1826 -8 l 1 000 -- -- __ __ MW 11 05/05/99 1015 1848 -833 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 MW 11 08/20/99 10 15 -- -- -- __ MW 11 12/06/99 10 15 2037 -1022 000 -- -- __ __ MW 1 t 02/29/00 1015 1829 -8 14 000 <1 <1 <1 <1 <50 <1 MW I I 05/16/00 1015 1849 -834 000 -- __ __ __ MW 11 09/11/00 1015 -- -_ __ MW1I 12/13/00 1015 -- MW 11 03/08/01 1015 M W 11 06/21/01 10 15 -- -- __ __ MW 11 09/20/01 1015 2203 -1188 000 4 8 18 23 15 5 58 <0 5 M W 11 11/08/01 1015 <0 5 <0 5 <0 5 <0 5 <50 <0 5 MW I 1 12/04/01 584 -- -_ __ MW 11 03/06/02 5 84 2087 -1503 000 <0 5 <0 5 <0 5 <0 5 <50 h 080 MW 11 03/06/02 584 102* MW i 1 06/11/02 584 MW11 09/10/02 584 -- MW 12 01/30/91 916 3539 -2623 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW t2 05/02/91 916 3545 -2629 000 <0 3 <0 3 <0 3 <1 <50 -- MW 12 07/16-17191 916 3637 -27 21 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW 12 10/15/91 9 16 3695 -2779 000 <0 5 <0 5 <0 5 <0 5 <50 -- g 1projects173942Unasterlwp1g090213942gw As Page 19 of 41