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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 ) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW6 08/17/89 892 2836 -1944 000 16,000 15,000 2,900 19,000 98,000 -- MW6 12/19/89 892 28 80 -1988 000 -- -- -- -- -- MW6 892 Well dry since 03/21/90 MW6 05/11/95 892 25 13 -1621 000 48 25 19 56 720 -- MW6 08/24/95 892 2649 -1757 000 -- -- -- -- -- MW6 10/19/95 892 Well dry -- -- -- -- -- -- MW6 02/13/96 892 Well dry -- -- -- -- -- -- MW6 04/18/96 892 Well dry -- -- -- -- -- -- MW6 08/08/96 892 Well dry -- -- -- -- -- MW6 11/04/96 892 Well dry -- -- -- -- -- -- MW6 02/03/97 892 Well dry -- -- -- -- -- -- MW6 05/08/97 748 Well dry -- -- -- -- -- -- MW6 08/26/97 7 48 Well dry -- -- -- -- -- -- MW6 11/11/97 748 Well dry -- -- -- -- -- -- MW6 03/03/98 7 48 1555 -807 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW6 03/03/98 748 <2 0* MW6 05/20/98 748 1485 -737 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW6 05/20/98 748 <2 0* MW6 08/19/98 748 1671 -923 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW6 08/19/98 748 <2 0* MW6 11/18/98 748 1716 -968 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW6 03/30/99 748 -- -- -- -- -- -- -- -- -- MW6 05/05/99 748 1558 -8 10 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 MW6 08/20/99 748 1681 -933 000 -- -- -- -- -- -- MW6 12/06/99 748 1370 -622 000 <1 <1 <1 <1 <50 <1 MW6 02/29/00 7 48 1496 -748 000 <1 <1 <1 <1 <50 <1 MW6 05/16/00 7 48 1478 -730 000 <1 <1 <1 <1 <50 <1 MW6 09/11/00 748 17 18 -970 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 MW6 12/13/00 7 48 1705 -957 000 <0 5 <0 5 <0 5 <0 5 140 <0 5 MW6 03/08/01 748 1627 -879 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 MW6 06/21/0I 748 1272 -524 000 <0 5 056 <0 5 <0 5 <50 <0 5 MW6 09/20/01 748 1875 -1127 000 -- -- -- -- -- -- MW6 12/04/01 744 1855 -11 11 000 -- -- -- -- -- -- g Iprojects\739421master\wp1gO30513942gw xis Page 14 of 57