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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 <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> Number Date feet feet feet feet Benzene Toluene benzene Xylenes TPH-g MTBE <br /> V4 09/27/04 8 12 2088 -1276 000 — -- -- — — -- <br /> V4 09/28/04 812 — -- -- 480 19,300 3,300 15,400 92,200 h 820 <br /> V4 09/28/04 812 <0 S* <br /> IPIA 09/27/04 -- -- -- — — -- -- -- -- — <br /> 1P1A 09/28/04 — -- -- -- 2,610 14,400 2,590 13,300 78,000 h <0 5* <br /> IPIB 09/27/04 — 2150 — -- — — -- -- -- — <br /> IP1B 09/28/04 — — -- -- 5,470 18,800 2,280 11,200 87,200 h <0 5* <br /> 1P2A 09/27/04 -- — -- _ -- -- — _ -- — <br /> IP2A 09/28/04 — — -- -- 570 13,300 2,490 11,600 67,800 h <0 5* <br /> IP2B 09/27/04 — 2170 — -- — — -- -- -- -- <br /> IP2B 09/28/04 -- — -- — 460 17,600 3,270 15,200 94,100 h <0 5* <br /> IP3A 09/27/04 -- — -- -- — -- -- — -- -- <br /> IP3B 09/27/04 — 2155 — -- -- — -- -- -- <br /> IP3B 09/28/04 — -- -- — 3,760 17,200 1,520 7,910 68,700 h <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 maybe 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 /> Water sample taken from SW2 on 17 February 1994 was labeled as AS2 on chain of custody and laboratory results <br /> y Analyzed by EPA Method 8260 for ethanol The results are ND<100 gg/L <br /> g1projects1739421masteAwp1go904U942gw xis Page 55 of 56 <br />