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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(149/L) Well Elevation to Water Elevation Thickness Ethyl- - Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW2 08/19/98 749 <2 0* MW2 11/18/98 749 1673 -924 000 -- -- MW2 03/30/99 749 -- -_ -- MW2 05/05/99 749 1520 -771 000 -- -_ -- MW2 08/20/99 749 1668 -919 000 101 456 808 242 253 68 1 MW2 12/06/99 749 1688 -939 000 <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 <l <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 -918 000 2 6 1 59 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 -966 000 <0 5 <0 5 <0 5 <0 5 81 12 MW2 06/21/01 749 <5* MW2 09/20/01 749 1781 -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 -940 000 170 <0 5 <0 5 <0 5 101 h 190 MW2 03/05/02 713 <0 5* MW3 01/87 914 -- -- 17 640 -- 400 32,000 -- MW3 07/16/87 9 14 1926 -1012 000 830 600 190 436 1,700 MW3 04/11/88 9 14 2243 -1329 000 450 970 210 860 4,600 MW3 09/13/88 914 2495 -1578 004 Not sampled- LPH MW3 11/16/88 914 2327 -14 13 000 <250 3,200 1,900 8,600 61,000 -- MW3 02/09/89 9 14 2541 -1627 Sheen Not sampled- LPH MW3 05/31/89 914 2643 -17 18 015 Not sampled- LPH MW3 08/17/89 9 14 28 12 -1877 015 Not sampled- LPH MW3 12/19/89 914 2849 -1926 013 Not sampled- LPH MW3 03/21/90 9 14 2851 -1929 Oil Not sampled- LPH MW3 914 Well diy since 05/17/90 MW3 02/17/94 9 14 2892 -1978 000 MW3 05/10/94 914 29 14 -2000 000 -- MW3 08/02/94 9 14 Well dry MW3 11/01/94 9 14 Well dry MW3 02/17/95 914 Well dry g Iprojects173942Vnasterlwp%gO30213942gw x6 Page 5 of 39