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: �� ■� w� � � 1• s• i l• i i i TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration (ug/L) Well Elevation to Watet Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH MTBE MW6 12/13/00 748 1705 -957 000 <0 5 <0 5 <0 5 <0 5 140 <0 5 i 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 -524 000 <0 5 056 <0 5 <0 5 <50 <0 5 MW6 09/20/01 748 18 75 -1127 000 MW6 12/04/01 744 18 55 -11 11 000 -- -- -- MW6 03/05/02 744 1750 -10 06 000 <0 5 070 <0 5 <0 5 <50 h <0 5 MWO 06/11/02 744 1833 -1089 000 <0 5 <0 5 <0 5 <0 5 <50 h <0 5 MW7 07/16/87 835 18 11 -976 000 78 35 32 67 8 1,000 MW7 04/11/88 835 2121 -1286 000 26 <2 0 10 <40 1,200 -- MW7 8 35 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 10/19/95 835 Well dry MW7 02/13/96 835 Well dry MW7 04/18/96 835 Well dry MW7 08/08/96 835 21 60 -13 25 000 _ MW7 11/04/96 8 35 2250 -14 15 000 -- -- -- -- MW7 02/03/97 835 17 58 -923 000 <0 5 <0 5 <0 5 <0 5 71 <2 5 MW7 05/08/97 6 85 1731 -1046 0 00 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW7 08/26/97 6 85 2009 -1324 000 -- -- -- __ MW7 11/11/97 685 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 6 85 <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 -8 97 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW7 03/30/99 685 -- __ MW7 05/05/99 6 85 1433 -748 000 <0 5 <0 5 <0 5 0 637 542 <2 0 g Iprotects173942atiasterlwp\gO6o213942gw As Pag 12 of43