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TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA I 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 M W 3 06/21/01 8 54 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 19 55 -1101 000 -- -- -- -- __ __ NIW3 12/04/01 851 1935 -1084 000 077 <0 5 <0 5 <0 5 71 <5* MW4 07/16/87 813 1815 -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 23 66 -15 53 000 860 40 670 2,400 5,600 -- MW4 11/16/88 8 13 23 81 -15 68 000 860 340 810 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 2650 -1837 000 1,000 45 940 1,100 8,100 -- MW4 12/19/89 8 13 27 57 -1944 000 190 2,800 1,100 380 7,900 -- MW4 03/21/90 8 13 2806 -1993 000 400 6 8 340 160 3,200 -- MW4 05/17/90 8 13 28 87 -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 8 13 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 27 85 -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 -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 87 2 9 520 -- MW4 08/24/95 8 13 25 22 -1709 000 28 20 35 7 2 870 -- MW4 10/19/95 8 13 25 70 -1757 000 19 <5 0 18 6 0 1,000 <25 MW4 02113196 8 13 2348 -15 35 000 4 4 <1 0 12 1 1 750 -- g�1rrgec073942\mastc mti pIq 1201139426w x6 Page 7 of 40