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i j TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH _ Concentration (Itg/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE 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 12/13/00 748 17 05 -957 000 <0 5 <0 5 <0 5 <0 5 140 <0 5 MW6 03/08/01 7 48 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 1855 -11 11 000 -- -- __ MW6 03/05/02 7 44 1750 -1006 000 <0 5 0.70 <0.5 <0 5 <50 h <0 5 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 05/11/95 835 Well dry -- __ __ __ -- _ MW7 08/24/95 835 Well dry MW7 10/19/95 8 35 Well dry MW7 02/13/96 8 35 Well dry MW7 04/18/96 8 35 Well dry MW7 08/08/96 835 2160 -1325 000 MW7 11/04/96 8 35 2250 -1415 000 -- -- __ __ MW7 02/03/97 835 1758 -923 000 <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 6 85 2009 -1324 000 -- -- __ __ MW7 11/11/97 6 85 Well dry __ _- -- MW7 03/03/98 685 1385 -700 000 <0 5 <0 5 <0 5 <0 5 79c <2 5 MW7 03/03/98 6 85 <2 0* MW7 05/20/98 685 1398 -7 13 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW7 05/20/98 685 <2 0* MW7 08119/98 6 85 1543 -858 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW7 08/19/98 685 <2 0* MW7 11/18/98 6 85 15 82 -997 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW7 03/30/99 6 85 -- -- __ g hprojects173942Vnastcr%wp1gO302O942gw As Page 1 i of 39