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TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHfNG 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 I MW7 10/19/95 835 Well dry MW7 02/13/96 835 Well dry MW7 04/18/96 835 Well dry MW7 08/08/96 835 21 60 -1325 000 MW7 11/04/96 835 2250 -1415 000 -- -- __ MW7 02/03/97 835 1758 -923 0 00 <0 5 <0 5 <0 5 <0 5 71 <2 5 MW7 05/08/97 6 85 17 31 -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 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 6 85 1398 -7 13 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW7 05/20/98 685 <2 0* MW7 08/19/98 6 85 1543 -8 58 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW7 08/19/98 6 85 <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 6 85 1433 -7 48 000 <0 5 <0 5 <0 5 0 637 542 <2 0 MW7 08/20/99 685 1575 -890 000 -- -- MW7 12/06/99 685 1597 -912 000 <1 <1 <1 <1 92 <1 MW7 02/29/00 6 85 13 51 -666 0 00 16 <1 <1 <1 64 <1 MW7 05/16/00 6 85 1365 -680 000 <1 <1 <1 <1 <50 <1 MW7 09/11/00 685 1592 -907 000 <0 5 <0 5 <0 5 <0 5 53 <0 5 MW7 12/13/00 6 85 1583 -898 000 076 2 8 063 309 <50 <0 5 MW7 03/08/01 6 85 1497 -8 12 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 MW7 06/21/01 685 1633 -948 000 <05 <05 <05 <05 <S0 <05 MW7 09/20/01 685 16 82 -997 000 -- -_ __ MW7 12/04/01 6 80 17 18 -1038 000 -- -_ __ MW7 03/05/02 6 80 1635 -955 0 00 <0 5 <0 5 <0 5 <0 5 <50 h <0 5 MW7 06/11/02 6 80 -- __ MW7 09/10/02 6 80 1800 -1120 000 MW7 12/18102 680 17.73 -1093 0.00 g\pro3ecta173942Lnasterlwplq 1202U942gw xis Page 13 of 45