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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 Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) feet feet feet Benzene Toluene benzene Xylenes TPH-g MTBE MW3 03/05/02 8 51 <0 5* MW3 06/11/02 851 18 88 -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 <0 5* MW3 12/18/02 851 1997 -1146 0 00 28 2 1 16 4 7 323 h <0 5 MW3 03/24/03 851 1940 -1089 000 -- -- -- -- -- -- MW3 03/25/03 8 51 -- -- -- 500 18 4 0 5 6 755 h <0 5 MW3 06/11/03 851 1956 -1105 000 182 61 148 123 1,510 h 344 MW3 06/11/03 851 <0 5* MW3 09/17/03 851 2094 -1243 000 920 62 12 4 167 1,510 h 268 MW3 09/17/03 851 <0 5* MW3 12/08/03 851 2094 -1243 000 5 70 6 l 9 0 11 1 1,270 h 16 3 MW3 12/08/03 851 <0 5* MW3 03/02/04 851 1945 -1094 000 680 4 4 10 4 9 7 940 h 224 MW3 03/02/04 8 51 <0 5* MW3 06/28/04 8 5l 20 61 -1210 000 -- -- -- -- -- -- MW3 06/29/04 851 -- -- -- 830 4 2 100 9 7 1,280 h 125 MW3 06/29/04 851 <0 5* MW3 09/27/04 851 2146 -1295 000 -- -- -- -- -- -- MW3 09/28/04 8 51 -- -- -- 890 113 6 7 156 1,000 h 9 4 MW3 09/28/04 851 <0 5* MW3 12/01/04 8 51 21 12 -1261 000 MW3 12/02/04 8 51 -- -- -- 560 4 6 101 9 2 1,090 h 12 3 MW3 12/02/04 851 <0 5* MW3 03/24/05 851 1926 -1075 000 770 3 6 8 1 6 4 1,250 h 6 3 MW3 03/24/05 851 <0 5* MW3 06/22/05 851 1924 -1073 000 -- -- -- -- -- -- MW3 06/23/05 8 51 -- - -- 750 2 5 6 4 4 7 685 h 79 MW3 06/23/05 8 51 <1* MW3 10/12/05 851 2063 -12 12 000 11 5 5 10 13 1,300 h 17/<0 5* MW3 12/22/05 851 2046 -1195 000 15 6 3 9 3 5 9 1,400 h -- MW4 07/16/87 8 13 18 15 -10 02 000 1,100 <50 850 1,750 4,900 -- MW4 04/11/88 8 13 2123 -13 10 000 510 <25 490 1,100 8,500 -- MW4 09/13/88 8 13 2366 -15 53 000 860 40 670 2,400 5,600 MW4 11/16199 8 13 23 81 -1568 000 860 340 810 1,000 8,000 -- glprglects173942Vnasterlwp1g120513942gw xis page 9 of 59