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TABLE 1 GROUNDWATER MONITORING DATA,FORMER EXXON R5 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH _ Concentration(pg/L) Well Elevation to Water Elevation Thickness Ethyl Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW6 08/26/97 748 Well dry MW6 11/11/97 748 Well dry -- -- __ __ __ -- MW6 03/03/98 748 1555 -807 0 00 <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 17 16 -968 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW6 03/30/99 749 -- -- -- __ __ __ __ __ 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 02/29/00 748 1496 -748 000 <1 <1 <1 <1 <50 <1 MW6 05/16/00 748 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 06/21/01 748 1272 -5 24 000 <0 5 056 <0 5 <0 5 <50 <0 5 MW6 09/20/01 748 1875 -1127 000 -- -- -- -- -- MW6 12/04/01 744 18 55 -11 11 000 -- -- -- __ __ -- MW6 03/05/02 744 1750 -1006 000 <0 5 070 <0 5 <0 5 <50 h <0 5 MW6 g 06/11/02 744 1833 -1089 000 <0 5 <0 5 <0 5 <0 5 <50 h <0 5 MW6 09/10/02 744 Well dry -- -- -- __ __ -- MW6 12/18/02 744 Well dry -- -- -- __ __ MW7 07/16/87 835 18 11 -976 000 78 35 32 678 1,000 -- MW7 04/11/88 835 2121 -1286 000 26 <2 0 10 <40 1,200 -- MW7 835 Well dry since 07/12/88 MW7 835 Not accessible since 12/30/93 MW7 05/11/95 8 35 Well dry -- -- __ __ MW7 08/24/95 8 35 Well dry G1ProJccis173942VMASTLRIWP\WP030313942gw xis Page 12 of 45