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s • • TABLE 1 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration(µg/L) _ Well Elevation to Water Elevation Thickness Ethyl- NumberDate _ (feet) (feet) (feet) ,(feet) Benzene Toluene benzene Xylenes TPI/-g MTBE MW4 05/31/89 8 13 2501 -1688 000 790 35 720 1,300 6,000 -- MW4 08/17/89 8 13 2650 -18 37 000 1,000 45 940 1,100 8,100 -- MW4 12/19/89 8 13 2757 -1944 000 190 2,800 1,100 380 7,900 -- MW4 03/21/90 8 13 28 06 -1993 000 400 6 8 340 160 3,200 -- MW4 05/17/90 8 13 2887 -2074 000 300 40 150 93 3,500 MW4 01/28/92 8 13 Dry -_ __ __ __ MW4 04/30/92 8 13 2953 -2140 000 MW4 08/13/92 813 Dry MW4 10/08/92 813 Dry MW4 02/23/93 8 13 29 12 -2099 000 MW4 05/18/93 813 -- -- -- MW4 08/22/93 813 2804 -1991 000 MW4 12/30/93 813 2785 -1972 000 MW4 .02/17/94 8 13 2749 -1936 000 MW4 05/10/94 8 13 27 17 -1904 000 MW4 08/02/94 8 13 2863 -2050 000 MW4 11/01/94 8 13 28 98 -20 85 000 -- -- -- __ 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 000 28 20 35 7 2 870 -- MW4 10/19/95 8 13 2570 -1757 000 19 <5 0 18 6 0 1,000 <25 MW4 02/13/96 8 13 2348 -1535 000 4 4 <1 0 12 1 1 750 -- MW4 04/18/96 8 l3 21 17 -1304 000 10 <1 0 12 10 430 <5 0 MW4 08/08/96 8 13 2241 -1428 000 4 4 <0 5 52 <0 50 450 7 4 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 1832 -1019 000 9 3 <2 0 11 3 5 1,400 17 MW4 05/08/97 7 18 1792 -1074 000 13 0 83 3 5 <0 5 780 10 MW4 08/26/97 7 18 1971 -1253 0 00 7 6 <1 0 <1 0 <1 0 440 c 12 MW4 11/11/97 7 18 2022 -13 04 0 00 <2 0 <2 0 <2 0 <2 0 720 c <10 MW4 03/03/98 7 18 1457 -739 000 8 9 0 80 058 <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 G Tro3ects173942WAS7 ERIWP\WP030R3942gu xfs Page 8 of 45