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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 ( L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW6 05/16/00 748 1478 -730 000 <1 <1 <1 <1 <50 <1 MW6 091I1/00 748 17 18 -970 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 MW6 12/13/00 748 1705 -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 -524 000 <0 5 056 <0 5 <0 5 <50 <0 5 MW6 09/20/01 748 1875 -1127 000 -- -- -- -- __ -- MW6 12/04/01 7 44 1855 -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 MW6 03/24/03 744 1625 -881 000 MW6 06/11/03 744 1875 -1131 000 — -- -.. -- -- 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 8 35 Not accessible since 12/30/93 MW7 05/11/95 835 Well dry -- -- -- -- MW7 08/24/95 835 Well dry -- -- -- _- __ MW7 10/19/95 835 Well dry MW7 02/13/96 835 Well dry MW7 04/18/96 8 35 Well dry MW7 08/08/96 835 2160 -1325 000 MW7 11/04/96 835 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 6 85 13 85 -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 6 85 13 98 -7 13 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 g lprojects1739421masterlwp1g060313942gw xis Page 13 of 49