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TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON,CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration(µg/L) <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> Number Date (feet) (feet)^ (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> MW4 02/09/89 8 13 2355 -1542 000 630 20 530 650 4,800 -- <br /> MW4 05/31/89 8 13 2501 -1688 000 790 35 720 1,300 6,000 -- <br /> MW4 08/17/89 8 13 2650 -1837 000 1,000 45 940 1,100 8,100 -- <br /> MW4 12/19/89 8 13 2757 -1944 000 190 2,800 1,100 380 7,900 -- <br /> MW4 03/21/90 8 13 28 06 -1993 000 400 6 8 340 160 3,200 -- <br /> MW4 05/17/90 8 13 2887 -2074 000 300 40 150 93 3,500 -- <br /> MW4 01/28/92 813 Dry -- -- -- -- -- <br /> MW4 04/30/92 8 13 2953 -2140 000 -- -- -- -- -- -- <br /> MW4 08/13/92 813 Dry -- -- -- -- -- -- <br /> MW4 10/08/92 813 Dry -- -- -- -- -- -- <br /> MW4 02/23/93 8 13 2912 -2099 000 -- -- -- -- -- -- <br /> MW4 05/18/93 813 -- -- -- -- -- -- -- -- -- <br /> MW4 08/22/93 8 13 2804 -1991 000 -- -- -- -- -- -- <br /> MW4 12/30/93 8 13 2785 -19 72 000 -- -- -- -- -- -- <br /> MW4 02/17/94 8 13 2749 -1936 000 -- -- -- -- -- <br /> MW4 05/10/94 8 13 27 17 -1904 000 -- -- -- -- -- -- <br /> MW4 08/02/94 8 13 2863 -2050 000 -- -- -- -- -- -- <br /> MW4 11/01/94 8 13 2898 -2085 000 -- -- -- -- -- <br /> MW4 02/17/95 8 13 2641 -1828 000 64 <0 5 3 2 3 4 880 -- <br /> MW4 05/11/95 8 13 23 84 -1571 000 9 1 <1 0 87 2 9 520 -- <br /> MW4 08/24/95 8 13 25 22 -1709 000 28 20 35 7 2 870 -- <br /> MW4 10/19/95 8 13 2570 -1757 000 19 <5 0 18 6 0 1,000 <25 <br /> MW4 02/13/96 8 13 2348 -15 35 000 4 4 <1 0 12 1 1 750 -- <br /> MW4 04/18/96 8 13 21 17 -1304 0 00 10 <1 0 12 10 430 <5 0 <br /> MW4 08/08/96 8 13 2241 -1428 0 00 4 4 <0 5 5 2 <0 50 450 7 4 <br /> MW4 11/04/96 8 13 2280 -1467 000 <0 5 <0 5 5 3 <0 5 730 15 <br /> MW4 02/03/97 8 13 1832 -1019 000 9 3 <2 0 11 3 5 1,400 17 <br /> MW4 05/08/97 7 18 1792 -10 74 000 13 083 3 5 <0 5 780 10 <br /> MW4 08/26/97 7 18 1971 -1253 000 7 6 <1 0 <1 0 <1 0 440 c 12 <br /> MW4 11/11/97 7 18 20 22 -1304 000 <2 0 <2 0 <2 0 <2 0 720 c <10 <br /> MW4 03/03/98 7 18 1457 -739 000 8 9 080 058 <0 5 640 13 <br /> MW4 03/03/98 7 18 6 0* <br /> MW4 05/20/98 7 18 1455 -737 000 15 <5 0 35 9 1 1,100 <25 <br /> g lproiects1739421masterlwplg12050942gw xls Page 10 of 59 <br />