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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(fiWL)_ Well Elevation to Water Elevation Thickness Ethyl- Number Date feet feet feet feet Benzene Toluene benzene Xylenes TPH-g MTBE MW3 03/24/03 8 51 1940 -1089 000 -- -- -- -- -- MW3 03/25/03 851 -- -- -- 500 18 4 0 56 755 h <0 5 MW3 06/11/03 851 1956 -1105 000 182 61 148 123 1,510 h 344 MW3 06/11/03 8 51 <0 5* MW3 09/17/03 851 2094 -1243 000 920 6 2 124 16 7 1,510 h 268 MW3 09/17/03 851 <0 5* MW3 12/08/03 851 2094 -1243 000 570 61 9 0 11 1 1,270 h 163 MW3 12/08/03 851 <0 5* MW3 03/02/04 851 1945 -1094 000 680 44 104 9 7 940 h 224 MW3 03/02/04 851 <0 5* MW3 06/28/04 851 2061 -1210 000 MW3 06/29/04 851 -- -- -- 830 4 2 100 9 7 1,280 h 12 5 MW3 06/29/04 851 <0 5* MW3 09/27/04 851 2146 -1295 000 -- -- -- -- ._ MW3 09/28/04 851 -- -- -- 890 113 6 7 156 1,000 h 94 MW3 09/28/04 851 <0 5* MW3 12/01/04 851 21.12 -1261 0.00 — -- -- — — — MW3 12/02/04 851 — -- — 560 4 6 101 9.2 1,090 h 123 MW3 12/02/04 851 <0 5* MW4 07/16/87 8 13 1815 -1002 000 1,100 <50 850 1,750 4,900 -- MW4 04/11/88 8 13 21 23 -13 10 000 510 <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 2650 -1837 000 1,000 45 940 1,100 8,100 -- MW4 12/19/89 8 13 2757 -1944 000 190 2,800 I,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 ISO 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 g vroiects173942timasterlwp\q 120413942gw xis Pege 9 of 58