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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(Ig/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW3 03/08/01 854 1706 -852 000 <0 5 <0 5 <0 5 <0 5 210 <0 5 MW3 06/21/01 854 1842 -988 000 <0 5 <0 5 <0 5 <0 5 160 2 9 MW3 06/21/01 854 <5* MW3 09/20/01 8 54 1955 -1101 000 -- -- __ MW3 12/04/01 8 51 1935 -1084 000 077 <0 5 <0 5 <0 5 71 <5* MW3 03/05/02 851 1850 -999 000 260 100 050 160 290 h 760 MW3 03/05/02 851 <0 5* MW3 06/11/02 851 1888 -1037 000 -- -- -- _- -- MW3 09/10/02 851 2020 -1169 000 16 2 6 18 5.9 246 h 6.5 MW3 09/10/02 851 Y <0 5* MW4 07/16/87 8 13 18 15 -1002 000 1,100 <50 850 1,750 4,900 -- MW4 04/11/88 813 2123 -1310 000 510 <25 490 1,100 8,500 MW4 09/13/88 8 13 2366 -1553 000 860 40 670 2,400 5,600 -- MW4 11/16/88 8 13 2381 -1568 000 860 340 810 1,000 8,000 MW4 02/09/89 8 13 23 55 -1542 000 630 20 530 650 4,800 MW4 05/31/89 8 13 2501 -1688 000 790 35 720 1,300 6,000 MW4 08/17/89 8 13 26 50 -1837 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 2806 -1993 000 400 68 340 160 3,200 -- MW4 05/17/90 8 13 2887 -2074 000 300 40 150 93 3,500 MW4 01/28/92 813 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 8 13 28 04 -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 27 17 -1904 000 MW4 08/02/94 8 13 28 63 -2050 000 MW4 11/01/94 8 13 2898 -2085 000 -- -- __ __ MW4 02/17/95 8 13 2641 -1828 000 6 4 <0 5 3 2 3 4 880 -- S%projects1739421masterlwp1y090213942gw As Page 7 of 41