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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(pg/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date feet feet feet feet Benzene Toluene benzene Xylenes TPH-g MTBE MW 10 12/08/03 725 2054 -1329 000 175 17 0 7 3 1 1,030 h 9 7 MW10 12/08/03 725 <0 5* MW 10 03/02/04 7 25 1919 -1194 000 148 1 1 0 7 21 794 h 163 MW10 03/02/04 725 <0 5* MW10 06/28/04 725 2033 -1308 000 880 2 2 0 5 4 1 1,010 h 98 MW 10 06/28/04 725 <0 5* MW 10 09/27/04 725 21 36 -14 l 1 000 -- -- -- -- -- -- MW10 09/28/04 725 -- -- -- 118 17 0 7 6 2 1,190 h 119 MW10 09/28/04 7 25 <0 5* MW10 12/01/04 725 2092 -1367 0 00 19 0 2 8 2 2 86 1,320 h 148 MW10 12/01/04 7 25 <0 5* MW10 03/24/05 7 25 18.95 -11.70 000 — -- -- -- -- -- MW10 03/25/05 725 — -- -- 20.3 2 0 10 4 8 1,270 h 6 4 MW10 03/25/05 725 <0 5* MW I 1 05/02/91 10 15 3839 -2824 000 <0 3 <0 3 <0 3 <1 <50 -- MW 11 07/16-17/91 10 15 3938 -2923 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW 11 10/15/91 10 15 3994 -2979 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW 11 01/28/92 10 15 3808 -2793 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW I l 04/30/92 1015 3772 -2757 0 00 <0 5 <0 5 <0 5 <0 5 <50 -- MW 11 08/13/92 10 15 3994 -2979 0 00 <0 5 <0 5 <0 5 <0 5 <50 -- MW I 1 10/08/92 10 15 4070 -3055 0 00 <0 5 <0 5 <0 5 <0 5 <50 -- MW 11 02/23/93 to 15 3728 -27 13 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW11 05/18/93 1015 -- -- -- -- -- -- -- -- MW 11 08/22/93 10 15 36 19 -2604 000 -- -- -- -- -- -- MW 11 12/30/93 10 15 Not accessible -- -- -- -- -- -- MW I 1 11/11/97 10 15 24 83 -1468 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW1 l 11/11/97 10 15 <2 0* MW 11 03/03/98 10 15 20 11 -996 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW11 03/03/98 10 15 <2 0* MW i 1 05/20/98 1015 1858 -843 000 <0 5f <0 5f <0 5f <0 517 <50f <2 517 MW l 1 05/20/98 1015 <2 0* MWI 1 08/I9/98 10 15 1994 -979 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 glprojects1739421masterlwplgO305U942gw xls Page 24 of 57