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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( /L) bYell Elevation to Water Elevation Thickness Ethyl-Number Date (feet) (feet) - (feet) (feet) _ Benzene Toluene benzene Xylenes TPH-g MTBE MW2 05/05/99 749 1520 -771 000 MW2 08/20/99 749 1668 -9 19 000 101 456 808 242 253 681 MW2 12/06/99 749 1688 -939 000 <1 <1 <1 <1 52 <1 M1V2 02/29/00 749 1442 -693 000 <1 <1 <1 <1 <50 <1 NIW2 05/16/00 749 1445 -696 000 <1 <1 <1 <1 <50 N I W2 09/11/00 749 1682 -933 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 1`I W 2 12/13/00 749 1667 -918 000 2 6 1 5 9 69 <0 5 NI\N,2 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 1 2 MW2 06/21/41 749 <5* MLV2 09/20/01 749 1781 -1032 000 M W2 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 7 15 <0 5* MW2 06/11/02 7 15 1749 -1034 000 A-IW2 09/10/02 7 15 1860 -1145 000 <0 5 <0 5 <0 5 <0 5 <50 h <0 5 MW2 12/18/02 7 15 1834 -11 19 000 1 1 <0 5 <0 5 <0 5 700 h <0 5 NI W 2 03/24/03 7 15 17 86 -1071 0 00 130 <0 5 <0 5 <0 5 945 h <0 5 M W2 06/11/03 7 15 1799 -1084 0 00 070 <0 5 <0 5 <0 5 52 1 h <0 5 MW2 09/17/03 7 15 1936 -1221 000 260 <0 5 <0 5 <0 5 187 h 13 MW2 09/17/03 7 15 <0 5* 111 W2 12/08/03 715 1935 -1220 000 170 <0 5 <0 5 <0 5 127 h 0 8 AIW2 12/08/03 715 <05* MW3 01/87 914 -- -- -- 17 640 400 32,000 NI W3 07/16/87 9 14 1926 -1012 000 830 600 190 436 1,700 NI W3 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 9 14 2327 -14 13 000 <250 3,200 1,900 8,600 61,000 -- MW3 02/09/89 914 2541 -1627 Sheen Not sampled- LPH Nff05/31/89 9 14 2643 -17 18 0 15 Not sampled- LPH M\V3 08/17/89 9 14 28 12 -1877 0 15 Not sampled- LPH I�projectsV39421masteAwplq I2GM3942gw xls Page 6 of 51