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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(pg/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date feet feet feet feet Benzene Toluene benzene Xylenes TPH-g MTBE MW4 06/21/01 7 18 32* MW4 09/20/01 7 18 1796 -1078 000 <0 5 076 <0 5 191 270 36 MW4 09/20/01 7 18 40* MW4 12/04/01 7 12 1771 -1059 000 076 <0 5 <0 5 <0 5 69 74* MW4 03/05/02 7 12 1685 -9 73 000 320 <0 5 <0 5 <0 5 316 h 760 MW4 03/05/02 712 112* MW4 06/11/02 7 12 1741 -1029 000 2 9 <0 5 <0 5 <0 5 424 h 778 MW4 06/11/02 7 12 40 6* MW4 09/10/02 7 12 1853 -1141 000 2 4 <0 5 <0 5 <0 5 324 h 85 0 MW4 09/10/02 7 12 94 4* MW4 12/18/02 7 12 1828 -11 16 000 18 <0 5 <0 5 <0 5 301 h 826 MW4 12/18/02 7 12 92 0* MW4 03/24/03 7 12 1780 -1068 000 <0 5 <0 5 <0 5 <0 5 402 h 723 MW4 03/24/03 7 12 72 5* MW4 06/11/03 7 12 1793 -1081 000 230 0 6 <0 5 <0 5 372 h 68 6 MW4 06/11/03 7 12 62 6* MW4 09/17/03 7 12 19 27 -12 15 000 330 <0 5 <0 5 <0 5 547 h 108 MW4 09/17/03 712 114* MW4 12/08/03 7 12 1928 -12 16 000 170 <0 5 <0 5 <0 5 444 h 126 MW4 12/08/03 712 130* MW4 03/02/04 7 12 1778 -1066 000 220 <0 5 <0 5 <0 5 354 h 100 MW4 03/02/04 7 12 84 2* MW4 06/28/04 7 12 1896 -1184 000 -- -- -- -- -- -- MW4 06/29/04 7 12 -- -- -- 1 20 <0 5 <0 5 <0 5 380 h 99 2* MW4 09/27/04 7 12 1983 -1271 000 -- -- -- -- -- -- MW4 09/28/04 7 12 -- -- -- 190 <0 5 <0 5 <0 5 406 h 96 3* MW4 12/01/04 7 12 1946 -1234 000 -- -- -- -- -- -- MW4 12/02/04 7 12 -- -- -- 140 <0 5 <0 5 <0 5 331 h 85 5* MW4 J 03/24/05 712 1758 -10.46 000 <0.5 <0.5 <0.5 <0.5 350 h 105* MW5 07/16/87 9 58 1669 -7 11 0 00 <10 480 280 1,390 2,200 -- MW5 04/11/88 958 2286 -1328 000 <2 0 25 25 85 500 -- MW5 09/13/88 958 2533 -1575 000 4 4 650 50 110 1,400 -- { g 1projects173942Umsterlwp\g030513942gw xis Page l l of 57