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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 NIW4 08/20/99 7 18 1645 -927 000 140 151 <0 5 168 460 203 NIW4 12/06/99 7 18 1655 -937 000 <1 <1 18 4 7 330 8 9 MW4 02/29/00 7 18 1412 -694 000 43 <1 <1 <1 100 7 MW4 05/16/00 7 18 1414 -696 000 19 <1 <1 <1 190 6 9 MW4 09/11/00 718 1649 -931 000 <0 5 <0 5 <0 5 <0 5 330 7 2 MW4 12/13/00 7 18 1635 -917 000 <0 5 58 082 5 1 360 13 M W4 12/13/00 7 18 10* MW4 03/08/01 7 18 1549 -831 0 00 <0 5 <0 5 <0 5 <0 5 280 24 MW4 06/21/01 7 18 l6 82 -964 000 <0 5 <0 5 <0 5 <0 5 200 30 NIW4 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 -973 000 320 <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* hl'"14 09/10/02 7 12 1853 -1141 000 2 4 <0 5 <0 5 <0 5 324 h 850 N,I\V4 09/10/02 7 12 94 4* MW4 12/18/02 7 12 1828 -11 16 000 1 8 <0 5 <0 5 <0 5 301 h 82 6 NIW4 12/18/02 7 12 92 0* MW4 03/24/03 7 12 17 80 -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 0 00 230 0 6 <0 5 <0 5 372 h 686 MW4 06/11/03 7 12 62 6* NIW4 09/17/03 7 12 1927 -12 15 0 00 330 <0 5 <0 5 <0 5 547 h 108 NM4 09/17/03 712 114* NIW4 12/08/03 712 1928 -1216 000 170 <0 5 <0 5 <0 5 444 h 126 AMA 12/08/03 712 130* MW5 07/16/87 958 1669 -7 11 000 <10 480 280 1,390 2,200 -- NN4W5 04/11/88 9 58 22 86 -1328 000 <2 0 25 25 85 500 -- 6 5pro3ec1s17394Rniasierlwplq I20313942gw xis Page 10 of 51