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r rr TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration( /L) Well Elevation to Water Elevation Thickness Ethyl- Number - Date (feet) (feet) (feet) _ (feet) Benzene Toluene benzene Xylenes TPH-� MTBE 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 1781 -1032 0 00 -- -- -- -_ -- MW2 12/04/01 7 15 1779 -1064 0 00 096 <0 5 <0 5 <0 5 61 10* MW2 03/05/02 7 15 1655 -940 0 00 170 <0 5 <0 5 <0 5 101 h 1 90 MW2 03/05/02 7 15 <0 5* MW2 06/11/02 7 15 1749 -1034 0 00 -- -- __ -_ __ _- MW2 09/10/02 7 15 1860 -1145 0 00 <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 MW2 03/24/03 7 15 1786 -1071 000 1 30 <0 5 <0 5 <0 5 945 h <0 5 MW2 06/11/03 7 15 1799 -1084 0 00 070 <0 5 <0 5 <0 5 521 h <0 5 MW3 01/87 914 -- -- -- 17 640 -- 400 32,000 -- MW3 07/16/87 9 14 1926 -1012 0 00 830 600 190 436 1,700 -- MW3 04/11/88 9 14 2243 -13 29 000 450 970 210 860 4,600 -- MW3 09/13/88 9 14 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 9 14 2541 -1627 Sheen Not sampled- LPH MW3 05/31/89 9 14 2643 -17 18 0 15 Not sampled- LPH MW3 08/17/89 9 14 2812 -1877 0 15 Not sampled- LPH MW3 12/19/89 914 2849 -1926 0 13 Not sampled- LPH MW3 03/21/90 9 14 28 51 -1929 0 1 l Not sampled- LPH MW3 9 14 Well dry since 05/17/90 MW3 02/17/94 9 14 2892 -1978 000 MW3 05/10/94 9 14 2914 -2000 0 00 -- -- -- _- __ MW3 08/02/94 9 14 Well dry MW3 11/01/94 9 14 Well dry -- -- -- -_ __ MW3 02/17/95 9 14 Well dry -- -- __ __ __ MW3 05/11/95 9 14 2559 -1645 000 97 24 42 1,300 5,600 -- MW3 08/24/95 914 2449 -15 35 000 45 5 9 19 440 2,600 MW3 10/19/95 914 Well dry -- -- __ __ __ g1pmjccu1739421mas[erlwp\g060313942gw As Pabc 6 of 48