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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(gg/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g _ __MTBE MW2 09/17/03 7 15 <0 5* MW2 12/08/03 7 15 1935 -1220 000 170 <0 5 <0 5 <0 5 127 h 08 MW2 12/08/03 7 15 <0 5* MW2 03/02/04 7 15 1784 -1069 000 250 <0 5 <0 5 <0 5 115 h 15 MW2 03/02/04 7 15 <0 5* MW2 06/28/04 7 15 1903 -1188 000 -- -- -- -- -- -- MW2 } 06/29/04 7 15 -- -- -- <0 5 <0 5 <0 5 <0 5 <50 h <0 5* MW2 09/27/04 7 15 1970 -1255 0 00 -- -- -- -- -- -- MW2 09/28/04 7 15 -- -- -- <0 5 <0 5 <0 5 <0 5 217 h <0 5* MW2 12/01/04 7 15 1934 -1219 000 -- -- -- -- -- -- MW2 12/02/04 7 15 -- -- -- 150 <0 5 <0 5 <0 5 133 h <0 5* MW2 03/24/05 7 15 1746 -1031 000 <0 5 <0 5 <0 5 <0 5 801 h <0 5* MW2 9 06/22/05 7 15 1747 -1032 000 0 80 <0 5 <0 5 <0 5 657 h <0 5* MW2 l 1011.2/05 7.15 18.93 -11..78 0.00 1.3 <0 5 <0 5 <0 5 54 h <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 -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 28 12 -1877 0 15 Not sampled- LPH MW3 12/19/89 9 14 2849 -1926 0 13 Not sampled- LPH MW3 03/21/90 9 14 2851 -1929 Oil Not sampled- LPH MW3 9 14 Well dry since 05/17/90 MW3 02/17/94 9 14 2892 -19 78 000 -- -- -- -- -- -- MW3 05/10/94 9 14 2914 -2000 000 -- -- -- -- -- -- 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 9 14 2449 -1535 0 00 45 5 9 19 440 2,600 -- S 1prglects1739421masterlwplq 100513942gw xis Page 7 of 58