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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 (Ity L.) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) feet) Benzene Toluene benzene Xylenes TPH-g MTBE Nil W I O 03/06/02 725 1790 -1065 000 3 10 <0 5 <0 5 <0 5 369 h 140 NI W 10 03/06/02 725 <0 5* M W I 0 06/11/02 725 -- -- -- -- -- -- -- -- -- M W 10 09/10/02 725 -- -- -- -- -- -- -- -- -- M W 10 12/18/02 725 -- -- -- -- -- -- -- -- -- M W 10 03/24/03 725 1226 -501 000 350 <0 5 <0 5 <0 5 541 h 86 M W 10 03/24/03 725 <0 5* N4"110 06/11/03 725 19 15 -1190 0 00 560 0 5 12 3 9 663 h 14 2 AIW10 06/11/03 725 <0 5* MW 10 09/17/03 7 25 2064 -1339 000 4 10 <0 5 <0 5 2 2 594 h 110 NIWIO 09/17/03 725 <0 5* 111 W10 12/08/03 725 2054 -1329 000 175 17 07 31 1,030 h 9 7 NIWI0 12/08/03 725 <0 5* 111 W I 1 05/02/91 1015 3839 -2824 000 <0 3 <0 3 <0 3 <1 <50 -- ItIW l l 07/16-17/91 1015 3938 -2923 000 <0 5 <0 5 <0 5 <0 5 <50 -- 1`1W 11 10/15/91 10 15 3994 -2979 000 <0 5 <0 5 <0 5 <0 5 <50 NMI 1 01/28/92 10 15 3808 -2793 000 <0 5 <0 5 <0 5 <0 5 <50 -- N911'11 04/30/92 10 15 3772 -2757 0 00 <0 5 <0 5 <0 5 <0 5 <50 -- NIWI 1 08/13192 10 15 3994 -2979 0 00 <0 5 <0 5 <0 5 <0 5 <50 -- M W 11 10/08/92 1015 4070 -3055 0 00 <0 5 <0 5 <0 5 <0 5 <50 -- %IW 1 1 02/23/93 1015 3728 -2713 000 <0 5 <0 5 <0 5 <0 5 <50 -- M W I 1 05/18/93 1015 -- -- -- -- -- -- -- -- -- NIW I l 08/22/93 1015 3619 -2604 000 -- -- -- -- -- -- A IW 1 1 12/30/93 1015 Not accessible -- -- -- -- -- -- MI 1 11/11/97 10 15 24 83 -1468 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 M W I 1 11/11/97 10 15 <2 0* MW I 1 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* MWl 1 05/20/98 10 15 18 58 -843 000 <0 5f <0 5f <0 5f <0 5f <50f <2 5f NI W 1 1 05/20/98 10 15 <2 0* MW 1 1 08/19/98 10 15 1994 -979 0 00 <0 5 <0 5 <0 5 <0 5 <50 <2 5 j L,%projecls1739421masterlwply 1203U942gw xis Page 22 of 51