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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(p /L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPFI-g MTBE MW2 08/08/96 8 77 2275 -1398 000 19 <0 5 41 11 490 6 8 MW2 11/04/96 877 2277 -1400 0 00 25 <0 5 65 14 810 21 MW2 02/03/97 877 1861 -984 000 -- -- -- MW2 05/08/97 749 18 25 -1076 000 12 <0 5 1 1 <0 5 73 <2 5 MW2 08/26/97 749 2003 -1254 000 -- -- -- MW2 11/11/97 749 2056 -1307 000 3 2 <0 5 3 4 0 71 160 5 2 MW2 03/03/98 749 1490 -741 000 14 <0 5 12 <0 5 110 3 3 MW2 03/03/98 749 <2 0* MW2 05/20/98 749 1486 -737 0 00 1 5 <0 5 1 1 <0 5 110e 4 1 MW2 05/20/98 749 <2 0* MW2 08/19/98 749 1636 -8 87 000 <0 5 2 1 1 2 <0 5 110 <2 5 MW2 08/19/98 749 <2 0* MW2 11/18/98 749 16 73 -924 000 -- -- -- MW2 03/30/99 749 -- -- MW2 05/05/99 749 1520 -7 71 000 -- -- MW2 08/20/99 749 1668 -9 19 000 101 456 808 242 253 681 MW2 12/06/99 749 16 88 -939 0 00 <1 <1 <1 <1 52 <1 MW2 02/29/00 749 1442 -693 000 <1 <1 <1 <1 <50 <1 MW2 05/16/00 749 1445 -696 000 <1 <1 <1 <1 <50 <1 MW2 09/11/00 749 1682 -933 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 MW2 12/13/00 749 1667 -9 18 000 2 6 1 5 9 69 <0 5 MW2 03/08/01 749 1581 -832 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 MW2 06/21/01 749 17 15 -966 0 00 <0 5 <0 5 <0 5 <0 5 81 1 2 MW2 06/21/01 749 <5* MW2 09/20/01 749 17 81 -1032 000 -- -- MW2 12/04/01 7 15 1779 -1064 000 096 <0 5 <0 5 <0 5 61 10* MW2 03/05/02 7 15 1655 -940 000 1 70 <0 5 <0 5 <0 5 101 h 190 MW2 03/05/02 715 <0 5* MW2 06/11/02 7 15 1749 -1034 000 -- -- M W3 01/87 9 14 -- -- -- 17 640 -- 400 32,000 -- MW3 07116187 9 14 1926 -10 12 000 830 600 190 436 1,700 -- 61pro3ects1739421inasterlwp\g0602O942gw As Page 5 of 43