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TABLE ] 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 /> MW 11 09/11/00 10 15 <br /> 12/13/00 1015 -- -- -- -- -- -- -- -- <br /> 03/08/01 1015 <br /> 06/21/01 1015 -- -- -- -- -- -- -- -- -- <br /> MW 12 01/30/91 9 16 3539 -2623 000 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 05/02/91 9 16 3545 -2629 000 <0 3 <0 3 <0 3 <1 <50 -- <br /> 07/16-17/91 9 16 3637 -2721 000 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 10/15/91 9 16 3695 -2779 000 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 01/28/92 9 16 3521 -2605 000 <0 5 0 6 <0 5 0 7 <50 -- <br /> 04/30/92 9 16 3483 -25 67 000 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 08/13/92 9 16 3682 -2766 000 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 10/08/92 9 16 3754 -2838 000 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 02/23/93 9 16 3445 -2529 000 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 05/18/93 9 16 Not Accessible -- -- -- -- -- <br /> 08/22/93 9 16 Not Accessible -- -- -- -- -- <br /> 12/30/93 9 16 Not Accessible -- -- -- -- -- <br /> 02/17/94 9 16 Not Accessible -- -- -- -- -- <br /> 05/10/94 9 16 3105 -21 89 000 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 08102/94 9 16 3255 -23 39 000 <0 5 <0 5 <0 5 <0 5 <50 <br /> 11/01/94 9 16 3303 -23 87 000 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 02/17/95 9 16 3057 -2141 000 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 05/11/95 9 16 2765 -1849 000 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 08/24/95 9 16 28 51 -1935 000 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 10/19/95 9 16 2888 -1972 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 02/13/96 9 16 2665 -1749 000 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 04/18/96 9 16 2412 -1496 000 -- -- -- -- -- <br /> 08/08/96 9 16 2493 -15 77 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 11/04/96 9 16 2531 -16 15 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 02/03/97 9 16 2103 -1187 000 -- -- -- -- <br /> 05/08/97 875 2000 -1125 000 -- -- -- -- -- <br /> 08/26/97 875 21 63 -1288 000 -- -- -- -- -- <br /> 11/11/97 875 2228 -1353 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> glpm3e4,Ls1739425maslerlwp%g6OI13942gw xls Page 18 of 37 <br />