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• i • 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-E MTBE MW2 05/20/98 749 <20* MW2 08/19/98 749 1636 -887 000 <0 5 21 1 2 <0 5 110 <2 5 MW2 08/19/98 749 <2 0* MW2 11/18/98 749 1673 -924 000 -- -- __ __ __ MW2 03/30/99 749 -- __ __ - MW2 05/05/99 749 1520 -771 000 -- -- ._ _- __ MW2 08/20/99 749 1668 -9 19 000 101 456 808 242 253 681 MW2 12/06/99 749 1688 -939 000 <1 <1 <1 <1 52 <1 MW2 02/29/00 749 1442 -693 000 <1 <1 <1 <1 <50 <1 MW2 05/16/00 749 1445 -696 000 <1 <1 <1 <1 <50 <1 MW2 09/11/00 749 16 82 -933 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 MW2 12/13/00 749 1667 -9 18 000 2 6 1 59 69 <0 5 MW2 03/08/01 749 1581 -832 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 MW2 06/21/01 749 17 15 -966 000 <0 5 <0 5 <0 5 <0 5 81 12 MW2 06/21/01 749 <5* MW2 09/20/01 749 1781 -1032 000 -- -- __ __ __ MW2 12/04/01 7 15 1779 -1064 0 00 096 <0 5 <0 5 <0 5 61 10* MW2 03/05/02 7 15 1655 -940 000 170 <0 5 <0 5 <0 5 101 h 190 MW2 03/05/02 7 15 <0 5* MW2 06/11/02 7 15 1749 -1034 000 -- -- __ __ MW2 09/10/02 7 15 1860 -1145 000 <0 5 <0 5 <0 5 <0 5 <50 h <0 5 MW2 12/18/02 7 15 1834 -11 19 000 1 1 <0 5 <0 5 <0 5 700 h <0 5 MW2 03/24/03 7 15 1786 -1071 000 130 <0 5 <0 5 <0 5 945 h <0 5 MW2 06/11/03 7 15 1799 -1084 000 070 <0 5 <0 5 <0 5 52 1 h <0 5 MW2 09/17/03 715 1936 -1221 000 2 60 <0 5 <0 5 <0 5 187 h 13 MW2 09/17/03 7 15 <0 5* MW2 12/08/03 7 15 1935 -1220 000 170 <0 5 <0 5 <0 5 127 h 0 8 MW2 12/08/03 7 15 <0 5* MW2 03/02/04 7 15 1784 -1069 000 250 <0 5 <0 5 <0 5 115 h 15 MW2 03/02/04 7 15 <0 5* MW2 06/28/04 715 19 03 -1188 000 -- — — — MW2 1 06/29/04 715 — — — <0 5 <0 5 <0 5 <0 5 <50 11 <0 5* g lprojects173942Unasterlwp1g0704U942gw As Page 6 of 54