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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 (FgIL) Well Elevation to Water Elevation Thickness Ethyl- Numbei Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW4 09/17/03 712 19 27 -1215 000 330 <0 5 <0 5 <0 5 547 h 108 MW4 09/17/03 7,12 114* MW5 07/16/87 959 16 69 -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 2531 -1573 000 <1 3 l9 25 24 910 -- MW5 02/09/89 958 2509 -1551 000 3 4 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 to 29 13 12 1,200 MW5 12/19/89 958 2945 -1987 000 -- -- -- __ __ MW5 958 Well dry since 03/21/90 MW5 12/30/93 958 29 90 -2032 000 MW5 02/17/94 958 2954 -1996 000 MW5 05/10/94 958 29 13 -l9 55 000 MW5 08/02/94 958 Well dry MW5 11/01/94 958 Well dry MW5 02/17/95 9 58 2841 -18 83 000 -- -- -- __ -- MW5 05/11/95 958 2572 -1614 000 14 1 2 7 5 4 8 350 -- MW5 08/24/95 958 2335 -13 77 000 <0 5 <0 5 072 15 85 -- MW5 10/19/95 958 2720 -1762 000 <0 5 <0 5 1 1 1 l 85 <2 5 MW5 02/13/96 958 Well dry -- -- __ __ __ __ MW5 04/18/96 958 2200 -1242 000 <0 5 <0 5 <0 5 068 65 <2 5 MW5 08/08/96 958 24 22 -1464 000 -- -- __ __ __ MW5 11/04/96 958 2468 -1510 000 -- -- __ _- __ -_ NI W 5 02/03/97 958 1989 -1031 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW5 05/08/97 8 63 1943 -1080 000 <0 5 <0 5 <0 5 <0 5 56 <2 5 MW5 08/26/97 863 20 19 -1156 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW5 11/11/97 863 Well dry -- -_ __ __ __ -- MW5 03/03/98 863 16 12 -749 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW5 03/03/98 8 63 <2 0* MW5 05/20198 8 63 1560 -697 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW5 05/20/98 863 <2 0* MW 5 08/19/98 8 63 1745 -882 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 L 1lirnj.,its%739431niasteil}ipkgO903U942gu xis Page 10 of 47