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TABLE I GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942, 4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration L <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> No Date (feet msl) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> MW6 02/29/00 748 1496 -748 000 <1 <1 <1 <1 <50 <1 <br /> 05/16/00 1478 -730 000 <I <1 <1 <1 <50 <1 <br /> 09/11/00 17 18 -970 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 <br /> 12/13/00 1705 -957 000 <05 <05 <05 <05 140 <05 <br /> 03/08/01 1627 -879 4.00 <0 5 <0 5 <0 5 <0 5 <50 <0 5 <br /> MW7 07/16/87 8 35 18 11 -976 000 78 35 32 678 1,000 -- <br /> 04/11/88 2121 -1286 000 26 <2 0 10 <40 1,200 <br /> Well dry since 07/12/88 <br /> Not accessible since 12/30/93 <br /> 05/11/95 Well dry _- -- -- -- -- <br /> 08/24/95 Well dry <br /> 10/19/95 Well dry <br /> 02/13/96 Well dry <br /> 04/18/96 Well dry <br /> 08/08/96 2160 -13 25 000 <br /> 11/04/96 2250 -14 15 000 -- -- -- __ __ -- <br /> 02/03/97 1758 -923 000 <05 <05 <05 <05 71 <25 <br /> 05/08/97 685 1731 -1046 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 08/26/97 2009 -13 24 000 -- -- __ __ -- -- <br /> 11/11/97 Well dry -- -- -- -- -- -- <br /> 03/03/98 13 85 -700 000 <0 5 <0 5 <0 5 <0 5 79c <2 5 <br /> 03/03/98 <2 0* <br /> 05/20/98 1398 -7 13 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 05/20/98 <2 0* <br /> 08/19/98 1543 -858 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 08/19/98 <2 0* <br /> 1 Iprojeus1739421masterlwp1g3Ol13942gw xis Page 12 of 41 <br />