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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(µg/L) Well Elevation to Water Elevation Thickness Ethyl- _ Number Date (feet) (feet) (feet) - (feet) Benzene Toluene benzene Xylenes TPH-g MTBE V4 06/21/01 822 1797 -974 002 -- -- - -- -- -- V4 09/20/01 822 1928 -1105 0 01 -- -- -- -- -- -- V4 12/04/01 812 1906 -1094 0 00 -- -- -- -- -- -- V4 03/05/02 8 12 1690 -878 000 4,480 17,200 2,800 14,100 60,600 h <25 V4 06/11/02 8 12 18 51 -1039 000 900 19,600 3,420 35,700 99,400 h 100 V4 06/11/02 812 <50* V4 09/10/02 8 12 1975 -1163 Sheen 890 11,000 3,510 16,600 106,000 h <50 V4 12/18/02 8 12 1948 - -1136 000 840 22,900 3,280 16,500 96,200 h 520 V4 12/18/02 812 <100* V4 03/24/03 8 12 1890 -1078 000 -- -- --V4 03/25/03 812 -- -- -- 700 2,300 3,390 17,100 102,000 h 130 V4 03/25/03 812 <10* V4 06/11/03 8 12 1908 -10 96 Sheen 738 22,700 3,340 14,400 87,500 h 838 V4 06/11/03 812 <5* V4 09/17/03 8 12 2047 -1235 000 590 17,800 3,330 14,900 84,500 h 130 114 09/17/03 812 <5* V4 12/08/03 812 2046 -1233 0 01 575 21,000 3,980 16,900 107,000 h <25 i a Water in well may be residual water in end cap b Unidentified hydrocarbons present c Hydrocarbons ranging from C6-C12 identified on the gasoline sample chromatogram d Analytical results may be incorrect due to possible mislabeling of samples for UVB-MW 1 and UVB-MW2 Resampled on 2 October 1997 e Gas and unidentified hydrocarbons ranging from C6-C8 identified on the gasoline sample chromatogram I Analyzed outside of hold time g Grab groundwater sample collected from well li 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 1.1311 Liquid-phase hydrocarbons fPl1-g Total Petroleum Hydrocarbons as gasoline MTBE Methyl tertiary butyl ether g Spro3ectsV39421masterlwp\q I20313942gw AS Page 50 of 51