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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( /L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) feet (feet) Benzene Toluene benzene Xylenes TPH-g MTBE NSI W4 04/30/92 8 13 2953 -2140 000 NIW4 08/13/92 813 Dry MW4 10/08/92 8 13 Dry NIW4 02/23/93 8 13 29 12 -2099 000 MW4 05/18/93 813 -- -- -- NIW4 _NIW4 08/22/93 8 13 2804 -1991 000 MW4 12/30/93 8 13 2785 -1972 000 MW4 02/17/94 8 13 2749 -1936 000 MW4 05/10/94 8 13 2717 -1904 000 MW4 08/02/94 8 13 28 63 -2050 000 MW4 11101/94 8 13 2898 -20 85 0 00 -- -- __ __ __ MW4 02/17/95 8 13 2641 -1828 000 6 4 <0 5 3 2 3 4 880 -- MW4 05/11/95 8 13 23 84 -1571 000 9 1 <1 0 8 7 2 9 520 -- MW4 08/24/95 8 13 2522 -1709 0 00 28 20 35 7 2 870 -- MW4 10/19/95 8 13 2570 -1757 000 19 <5 0 18 6 0 1,000 <25 A1W4 02/13/96 8 13 2348 -1535 000 4 4 <1 0 12 1 1 750 -- N1\V4 04/18/96 8 13 21 17 -1304 000 10 <1 0 12 1 0 430 <5 0 NIW4 08/08/96 8 13 2241 -1428 000 4 4 <0 5 5 2 <0 50 450 74 MW4 11/04/96 8 13 2280 -1467 000 <0 5 <0 5 5 3 <0 5 730 15 MW4 02/03/97 8 13 18 32 -10 19 000 9 3 <2 0 11 3 5 1,400 17 N4 W4 05/08/97 7 18 1792 -1074 000 13 083 3 5 <0 5 780 10 MW4 08/26/97 7 18 1971 -1253 000 7 6 <1 0 <1 0 <1 0 440 c 12 MW4 11/11/97 7 18 2022 -1304 000 <2 0 <2 0 <2 0 <2 0 720 c <10 MW4 03/03/98 7 18 1457 -739 000 8 9 080 058 <0 5 640 13 MW4 03/03/98 7 18 6 0* MW4 05/20/98 7 18 1455 -737 000 15 <5 0 35 9 1 1,100 <25 NlW4 05/20/98 7 18 6 5* MW4 08/19/98 7 18 16 06 -8 88 000 1 1 16 4 3 <0 5 680 <2 5 MW4 08/19/98 7 18 77* NlW4 11/18/98 7 18 1640 -922 0 00 <0 5 14 5 4 <0 5 770 c 15 MW4 03/30/99 718 -- -- __ MW4 05/05/99 7 18 1490 -772 000 <0 5 <0 5 1 14 <0 5 542 72 1projectsM9421masier�wplq 12O139426w xis Page 9 of 51