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s � � 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 I IP3B 09/27/04 -- 2155 -- -- -- -- -- -- -- -- IP3B g 09/28/04 -- -- -- -- 3,760 17,200 1,520 7,910 68,700 h <0 5* IP313 g 12/03/04 -- 21 10 -- 2,930 19,500 2,720 13,500 123,000 h 900 IP3B 12/03/04 <50* IP313 g 03/25/05 822 -- -- -- 2,140 18,900 3,500 16,100 103,000 h <25* IP3B 06/22/05 822 -- -- — -- -- -- -- -- -- IP3B g 06/23/05 822 — -- -- 2,200 18,900 3,000 15,700 101,000 h 710 IP3B 06/23/05 822 <10* 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 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 j Analyzed by EPA Method 8260 for ethanol The results are ND<100µg/L 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 µg/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 Iprojects1739421master\wp1gp60513942gw xis Page 59 of 59