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TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration ( /L) <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> UVB-MW2 05/20/98 7 75 <14* <br /> UVB-MW2 08/19/98 775 1703 -928 000 14 48 2 7 24 250 16 <br /> UVB-MW2 08/19/98 775 <2 0* <br /> UVB-MW2 11/18/98 775 1753 -978 000 230 80 25 23 760 <25 <br /> UVB-MW2 03/30/99 775 1663 -8 88 000 805 76 1 366 240 6,290 <20 <br /> UVB-MW2 05/05/99 775 16 12 -837 000 693 366 457 225 5,510 35 8 <br /> UVB-MW2 08/20/99 775 1753 -978 000 73 0 759 120 252 2,430 104 <br /> UVB-MW2 12/06/99 775 1768 -993 000 23 <1 <1 <1 600 9 4 <br /> UVB-MW2 02/29/00 775 15 33 -758 000 27 12 5 7 5 2 320 <1 <br /> UVB-MW2 05/16/00 775 1508 -733 000 87 14 2 8 4 680 7 5 <br /> UVB-MW2 09/11/00 775 1755 -980 000 330 7 1 29 27 2,100 <2 5 <br /> UVB-MW2 12/13/00 775 1741 -966 000 120 180 19 124 1,800 <2 5 <br /> UVB-MW2 03/08/01 775 1654 -879 000 180 210 44 193 2,700 4 4 <br /> UVB-MW2 06/21/01 775 1793 -10 18 000 38 53 6 307 1,200 19 <br /> UVB-MW2 06/21/01 7 75 <5* <br /> UVB-MW2 09/20/01 7 75 19 13 -1138 0 00 24 3 6 1 3 11 9 1,300 <0 5 <br /> UVB-MW26 12/04/01 774 1892 -11 18 0 00 41 <0 5 092 119 330 <5* <br /> UVB-MW2 03/05/02 774 1800 -1026 000 112 350 110 410 1,760 h 55 0 <br /> UVB-MW2 03/05/02 774 <0 5* <br /> UVB-MW2 06/11/02 7 74 1855 -1081 000 185 0 7 l 1 1 4 108 h 13 <br /> UVB-MW2 06/11/02 774 <0 5* <br /> a Water in well may be residual water in end cap <br /> b Unidentified hydrocarbons present <br /> C Hydrocarbons ranging from C6-Cl2 identified on the gasoline sample chromatogram <br /> d Analytical results may be incorrect due to possible mislabeling of samples for UVB-MW 1 and UVB-MW2 Resampled on 2 October 1997 <br /> e Gas and unidentified hydrocarbons ranging from C6-C8 identified on the gasoline sample chromatogram <br /> f Analyzed outside of hold time <br /> g Grab groundwater sample collected from well <br /> h TPH-g results beginning March 2002 include MTBE <br /> LPFI Liquid-phase hydrocarbons <br /> g lprojects%739425isiasterlwp\gO60213942gw xis Page 42 of 43 <br />