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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(yg/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW4 03/05/02 712 112* MW4 06/11/02 7 12 1741 40 0 29 000 2 9 <0 5 <0 5 <0 5 424 h 778 MW4 06/11/02 7 12 40 6* MW4 09/10/02 7 12 1853 -1141 000 2 4 <0 5 <0 5 <0 5 324 h 850 MW4 09/10/02 7 12 94 4* MW5 07/16/87 9 58 1669 -7 11 000 <10 480 280 1,390 2,200 -- MW5 04/11/88 958 2286 -1328 000 <2 0 25 25 85 500 -- MW5 09/13/88 958 2533 -1575 000 4 4 650 50 110 1,400 -- MW5 11/16/88 958 25 31_ -1573 000 <1 3 19 25 24 910 - MW5 02/09/89 958 2509 -1551 000 34 12 15 22 1,250 - MW5 05/31/89 958 2672 -17 14 000 <0 5 14 24 46 790 -- MW5 08/17/89 958 2844 -1886 000 10 29 13 12 1,200 MW5 12/19/89 959 2945 -1987 000 -- -- -- __ __ MW5 958 Well dry since 03/21/90 MW5 12/30/93 958 2990 -2032 000 MW5 02/17/94 958 2954 -1996 000 MW5 05/10/94 958 2913 -1955 000 MW5 08/02/94 959 Well dry MW5 11/01/94 958 Well dry MW5 02/17/95 958 2841 -1883 000 -- -- -- __ _- MW5 05/11/95 958 2572 -1614 000 14 12 7 5 48 350 -- MW5 08/24/95 958 2335 -1377 000 <0 5 <0 5 072 15 85 -- MW5 10/19/95 958 2720 -1762 000 <0 5 <0 5 1 1 1 1 85 <2 5 MW5 02/13/96 958 Well dry -- -- __ __ __ -- MW5 04/18/96 958 2200 -1242 000 <0 5 <0 5 <0 5 0 68 65 <2 5 MW5 08/08/96 958 2422 -14 64 000 -- -- __ __ MW5 11/04/96 958 2468 -15 10 000 -- -- -- __ MW5 02/03/97 958 1989 -1031 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW5 05/08/97 863 1943 -1080 000 <0 5 <0 5 <0 5 <0 5 56 <2 5 MW5 08/26/97 863 2019 -1156 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW5 11/11/97 863 Well dry -- -- __ -- __ -- MW5 03/03/98 8 63 1612 -749 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW5 03/03/98 8 63 <2 0* glproiecis173942dnasicAwptigp902U942gw xis Page 9 of 41