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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- MTBE MW 10 12/06/99 729 1766 -1037 000 MW 10 02/29/00 729 15 34 -805 000 <1 <1 <1 <1 <50 MW 10 05/16/00 729 1542 -813 000 MW 10 09/11/00 729 1743 -1014 000 08 2 <0 5 197 50 <0 5 MW 10 12/13/00 729 1729 -1000 000 <0 5 <0 5 <0 5 <0 5 62 <0 5 M W 10 03/08/01 729 1654 -925 000 <0 5 <0 5 <0 5 <0 5 78 <0 5 M W 10 06/21/01 729 1792 -1063 000 <0 5 <0 5 <0 5 <0 5 <50 1 2 MW 10 06/21/01 729 <5* M W 10 09/20/01 729 19 It -11 82 000 -- -- __ M W 10 12/04/01 725 1889 -1164 000 MW 10 03/06/02 725 1790 -1065 000 3 10 <0 5 <0 5 <0 5 369 h 14 0 MW 10 03/06/02 725 <0 5* M W 10 06/11/02 725 MW I 1 05/02/91 10 15 38 39 -28 24 0 00 <0 3 <0 3 <0 3 <1 < 50 MW I 1 07116-17191 10 15 3938 -2923 000 <0 5 <0 5 <0 5 <0 5 <50 MW I 1 10/15/91 10 15 3994 -29 79 000 <0 5 <0 5 <0 5 <0 5 <50 M W 11 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 11 08/13/92 1015 3994 -2979 000 <0 5 <0 5 <0 5 <0 5 <50 MW I 1 10/08/92 1015 4070 -3055 000 <0 5 <0 5 <0 5 <0 5 <50 MW I 1 02/23/93 10 15 3728 -2713 000 <0 5 <0 5 <0 5 <0 5 <50 MW I 1 05/18/93 10 15 MW I 1 08/22/93 10 15 36 19 -2604 000 MW l 1 12/30/93 10 15 Not accessible M W 1 1 11/11/97 10 15 2483 -1468 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW 11 11/11/97 1015 <2 0* MW I l 03/03/98 1015 2011 -996 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MWI 1 03/03/98 10 15 <2 0* MW11 05/20/98 10 15 18 58 -843 000 <0 5f <0 5f <0 5f <0 5f <50f <2 5f MWI1 05/20/98 10 15 <2 0* MW I I 08/19/98 10 15 1994 -979 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 6lprajects1739421nmsterlwplgo6o2U942gx As Page 19 oF43