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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 UVB-MW2 09/11/00 7 75 1755 -980 000 330 7 1 29 27 2,100 <2 5 UVB-MW2 12/13/00 7 75 1741 -966 000 120 180 19 124 1,800 <2 5 UVB-MW2 03/08/01 775 1654 -879 000 180 210 44 193 2,700 44 UVB-MW2 06/21/01 775 1793 -1018 000 38 53 6 307 1,200 19 UVB-MW2 06/21/01 775 <5* UVB-MW2 09/20/01 775 19 13 -1138 000 24 3 6 1 3 119 1,300 <0 5 UVB-MW2 g 12/04/01 774 1892 -11 18 000 41 <0 5 092 119 330 <5* UVB-MW2 03/05/02 774 1800 -1026 000 112 350 110 41 0 1,760 h 550 UVB-MW2 03/05/02 7 74 <0 5* UVB-MW2 06/11/02 774 18 55 -1081 000 185 0 7 1 1 14 108 h 13 UVB-MW2 06/11/02 774 <0 5* UVB-MW2 09/10/02 774 1978 -1204 000 458 2 3 110 120 1,210 h 236 UVB-MW2 09/10/02 774 <0 5* UVB-MW2 12/18/02 774 1954 -11 80 0 00 85 6 2 7 14 3 179 878 h <0 5 UVB-MW2 03/24/03 774 1895 -1121 000 UVB-MW2 03/25/03 774 -- -- 581 2 3 4 9 4 9 2,100 h 329 UVB-MW2 03/25/03 774 <0 5* a Water in well may be residual water in end cap b Unidentified hydrocarbons piesent c Hydrocarbons ranging from C6-C 12 identified on the gasoline sample chromatogram d Analytical results may be incorrect due to possible mislabeling of samples for UVB-MW I and UVB-MW2 Resampled on 2 October 1997 e Gas and unidentified hydrocarbons ranging from C6-C8 identified on the gasoline sample chromatogram f Analyzed outside of hold time g Grab groundwater sample collected from well h TPH-g results beginning March 2002 include MTBE I Water sample taken from SW2 on 17 February 1994 was labeled as AS2 on chain of custody and laboratory results LPH Liquid-phase hydrocarbons TPH-g Total Petroleum Hydrocarbons as gasoline MTBE Methyl tertiary butyl ether * Analyzed by EPA Method 8260 g lprojects173942Unasterlwp\g4303U942gw As Page:46 of 47