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i i • TABLE 1 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-g MTBE MW7 10/19/95 8 35 Well dry MW7 02/13/96 835 Well dry MW7 04/18/96 8 35 Well dry MW7 08/08/96 8 35 2160 -1325 000 -- -- -- -- __ MW7 11/04/96 8 35 2250 -1415 000 -- -- -- _- __ -- MW7 02/03/97 8 35 1758 -9 23 000 <0 5 <0 5 <0 5 <0 5 71 <2 5 MW7 05/08/97 6 85 1731 -1046 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW7 08/26/97 685 2009 -1324 0 00 -- -- __ __ -- -- MW7 11111/97 6 85 Well dry -- -- -- __ __ -- MW7 03103/98 6 85 13 85 -700 0 00 <0 5 <0 5 <0 5 <0 5 79c <2 5 MW7 03/03/98 685 <2 0* MW7 05/20/98 685 1398 -7 13 0 00 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW7 05/20/98 6 85 <2 0* MW7 08/19/98 685 1543 -858 0 00 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW7 08/19/98 685 <2 0* MW7 _ 11/18/98 6 85 1582 -897 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW7 03/30/99 6 85 -- -- _- __ __ __ MW7 05/05/99 685 1433 -748 000 <0 5 <0 5 <0 5 0 637 542 <2 0 MW7 08/20/99 6 85 15 75 -890 000 -- -- -- __ __ -- MW7 12/06/99 6 85 1597 -912 000 <1 <1 <1 <1 92 <1 MW7 02/29/00 6 85 1351 -666 000 16 <1 <1 <1 64 <1 MW7 05/16/00 685 13 65 -680 000 <1 <1 <1 <1 <50 <1 MW7 09/11/00 6 85 15 92 -907 000 <0 5 <0 5 <0 5 <0 5 53 <0 5 MW7 12/13/00 685 1583 -898 000 076 2 8 063 3 09 <50 <0 5 MW7 03/08/01 685 1497 -8 12 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 MW7 06/21/01 6 85 1633 -948 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 MW7 09/20/01 685 1682 -9 97 000 -- -- -_ __ MW7 12/04/01 6 80 17 18 -1038 000 -- -- __ __ __ -- MW7 03/05/02 6 80 1635 -955 000 <0 5 <0 5 <0 5 <0 5 <50 h <0 5 MW7 06/11/02 680 -- -- __ __ __ MW7 09/10/02 6 80 1800 -1120 000 MW7 12/18/02 6 80 17 73 -1093 000 G%Projects1739421MASTERIWP1WP030313942gw xis Page 13 or45