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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 IP3A 12/03/04 -- -- -- 266 1,300 588 2,830 17,800 h 16 0 IP3A 12/03/04 <10* 03A 03/25/05 831 -- -- 915 2,170 2,600 10,300 65,700 h 165 IP3A 03/25/05 <10* -- 2155 IP3B 09/27/04 -- -- -- -- -- -- -- -- IP313 09/28/04 -- -- -- -- 3,760 17,200 1,520 7,910 68,700 h <0 5* IP313 12/03/04 -- 21 10 -- 2,930 19,500 2,720 13,500 123,000 b 900 IP3B 12/03/04 <50* 1P3B 03/25/05 822 — — -- 2,140 18,900 3,500 16,100 103,000 h <25* a Water in well may be residual water in end cap b Unidentified hydrocarbons present 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 1 and UVB-MW2 Resampled on 2 October 1997 e Gas and unidentified hydrocarbons ranging from C6-C8 identified on the gasoline sample cbromatogram 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 j Analyzed by EPA Method 8260 for ethanol The results are ND<100µglL LPH Liquid-phase hydrocarbons TPH-g Total Petroleum Hydrocarbons as gasoline MTBE Methyl tertiary butyl ether * Analyzed by EPA Method 8260 -- Not measured,not sampled,or not analyzed pg/L Micrograms per liter Note Groundwater elevations adjusted for LPH,when present,using an average specific gravity of 0 75 for gasoline Data from 1187 from HLA g 1projects1739421masterlwplgO30513942gw xls Page 57 of 57