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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 MW10 05/11/95 861 2646 -1785 000 360 750 230 480 6,300 -- MW10 08/24/95 861 2758 -1897 000 150 1,100 190 590 3,100 -- MW 10 10/19/95 8 6l 2793 -1932 000 55 1 1 8 2 1 1 300 21 MW10 02/13/96 861 25 67 -1706 000 1,600 15,000 1,400 6,500 64,000 -- MW10 04/18/96 861 2320 -1459 000 1,100 8,900 1,100 4,400 42,000 <500 MWIO 08/08/96 8 61 2427 -1566 000 58 340 61 230 1,500 <50 MW10 11/04/96 861 2451 -1590 000 140 3,400 410 1,600 15,000 <250 MW10 02/03/97 861 2024 -1163 000 1,500 18,000 2,100 9,500 66,000 1,800 MW 10 05/08/97 729 1928 -it 99 000 40 51 64 110 1,300 38 MW 10 08/26/97 729 21 11 -13 82 000 2 1 14 3 7 <0 5 63 <2 5 MW 10 11/11/97 729 2162 -1433 000 1 8 060 0 84 <0 5 <50 3 L MW I O 03/03/98 729 1630 -901 000 360 7,800 1,300 5,000 23,000 940 MW10 03/03/98 729 <200* MW10 05/20/98 729 l5 62 -833 000 8 1 85 11 100 630 <5 0 MW 10 05/20/98 729 <2 0* MW 10 08/19/98 729 1706 -977 000 077 <0 5 <0 5 <0 5 <50 <2 5 MW10 08/19/98 729 <2 0* MW10 11/18/98 729 1747 -1018 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW 10 03/30/99 729 1554 -825 000 MW 10 05/05/99 729 1584 -855 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 MW10 08/20/99 729 MW10 12/06/99 729 1766 -1037 0 00 MW 10 02/29/00 729 1534 -805 000 <1 <1 <1 <1 <50 <1 MW 10 05/16/00 729 1542 -8 13 000 MW 10 09/11/00 729 1743 -1014 000 0 8 2 <0 5 197 50 <0 5 MW10 12/13/00 729 1729 -1000 000 <0 5 <0 5 <0 5 <0 5 62 <0 5 MW 10 03/08/01 729 1654 -925 000 <0 5 <0 5 <0 5 <0 5 78 <0 5 MW 10 06/21/01 729 1792 -1063 000 <0 5 <0 5 <0 5 <0 5 <50 12 MW 10 06/21/01 729 <5* MW10 09/20/01 729 l9 l 1 -11 82 000 MW10 12/04/01 725 1889 -1164 000 MW l0 03/06/02 725 1790 -1065 000 3 10 <0 5 <0 5 <0 5 369 h 14 0 g Iprojecu1739421masterlwplg070413942gw xis Page 22 of 54