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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 MW3 12/08/03 851 2094 -1243 000 570 61 9 0 111 1,270 h 163 MW3 12/08/03 851 <0 5* MW3 03/02/04 851 1945 -1094 000 680 4 4 104 9 7 940 h 224 MW3 03/02/04 851 <0 5* MW3 06/28/04 851 2061 -12 10 000 -- -- -- -- -- -- MW3 06/29/04 851 -- -- -- 830 4 2 100 9 7 1,280 h 12 5 MW3 06/29/04 8 51 <0 5* MW3 09/27/04 851 2146 -1295 000 — — — -- -- — MW3 09/28/04 8 51 -- — -- 890 11.3 6 7 156 1,000 h 9 4 MW3 09/28/04 8 51 <0 5* MW4 07/I6/87 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 -15 53 000 860 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 2355 -1542 0 00 630 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 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 2912 -2099 000 -- -- -- -- -- '" MW4 05/18/93 813 -- -- -- -- -" -- MW4 08/22/93 8 13 2804 -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 2717 -1904 0 00 -- -- -- -' -- MW4 08/02/94 8 13 2863 -2050 000 -- -- -- -- -- MW4 11/01/94 8 13 2898 -2085 000 -- -- -- -- -- -- g 1projects173942\masterlwplgO9O4U942gw x1s Page 9 of 56