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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 MW12 11/04/96 9 16 2531 -16 15 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW12 02/03/97 9 16 2103 -1187 000 -- -- -- -- -- -- MW12 _MW12 05/08/97 875 2000 -1125 000 -- -- -- -- -- _- MW12 08/26/97 975 2163 -1288 000 -- -- -- -- __ -- MW12 _MW12 11/11/97 875 2228 -1353 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW12 03/03/98 875 1705 -830 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW12 03/03/98 875 <2 0* MW12 05/20/98 875 1623 -748 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW12 05/20/98 875 <2 0* MW12 08/19/98 875 1758 -883 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW12 08/19/98 875 <20* MW12 11/18/98 875 18 10 -935 000 -- -- -- -- -- -- MW12 03/30/99 875 1630 -755 0 00 -- -- -- -- __ -- MW12 _MW12 05/05/99 875 1644 -769 0 00 <0 5 <0 5 <0 5 <0 5 <50 <2 0 MW12 08/20/99 875 -- -- -- __ __ __ __ -- MW12 _MW12 12/06/99 875 MW12 02/29/00 8 75 -- -- MW12 05/16/00 8 75 1628 -753 0 00 MW12 09/11/00 8 75 -- -- -- MW12 12/13/00 875 -- -- __ __ __ -- MW12 03/08/01 8 75 1730 -8 55 0 00 <0 5 <0 5 <0 5 4 5 <50 <0 5 MW12 06/21/01 875 1862 -987 0 00 <0 5 <0 5 <0 5 <0 5 <50 <0 5 MW12 09/20/01 875 1985 -11 10 0 00 -- -- -- -- -- -- MW12 _MW12 12/04/01 7 75 1966 -1191 0 00 MW12 03/05/02 7 75 -- -- __ __ __ h MW12 06/11/02 7 75 MW12 09/10/02 7 75 Not Accessible MW12 12/18/02 7 75 Not Accessible -- -- -- -- __ MW12 03/24/03 775 Not Accessible -- -- -- -- -- _- MW12 06/11/03 7 75 1995 -1220 0 00 <0 5 <0 5 <0 5 <0 5 <50 h <0 5 MW12 09/17/03 7 75 Not Accessible -- -- -- -- -- -- MW12 12/08/03 7 75 Not Accessible -- -- -- -- -- -- MW12 03/02/04 775 Not Accessible -- -- -- -- -- _ S 1proJects1739421masterlwplq 120513942gw x1s Page 28 of 59