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TABLE I GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA <br /> Casing Depth Groundwater LPH _ Concentration(pg/L) <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> Number Date (feet) (feet) <br /> (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> c Hydrocarbons ranging from C6-C12 identified on the gasoline sample chromatogram <br /> d Andlyttcal results maybe incorrect due to possible mislabeling of samples for UVB-MW I and UVB-MW2 Resampled on 2 October 1997 <br /> c 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 /> i Water sample taken from SW2 on 17 February 1994 was labeled as AS2 on chain of custody and laboratory results <br /> LPH Liquid-phase hydrocarbons <br /> TPH-g Total Petroleum Hydrocarbons as gasoline <br /> MTBE Methyl t-butyl ether <br /> * Analyzed by EPA Method 8260 <br /> -- Not measured,not sampled,or not analyzed <br /> pg/L Micrograms per liter <br /> Note Groundwater elevations adjusted for LPH,when present,using an average specific gravity of 0 75 for gasoline <br /> Data from 1/87 from HLA <br /> i <br /> G 1Projects1739421MASTERIWF1WP030313942gw As Page 45 of 45 <br />