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TABLE 1 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942, 4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration ( /L) <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> No Date (feet ms]) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> c Hydrocarbons ranging from C6-C12 identified on the gasoline sample chromatogram <br /> d Analythcal results may be incorrect due to possible mislabeling of samples for UVB-MW 1 and UVB-MW2 <br /> 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 /> 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 /> tig/L Micrograms per liter <br /> Leet msl Feet relative to mean sea level <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 /> Water sample taken from SW2 on 17 February 1994 was labeled as AS2 on chain of custody and laboratory results <br /> i <br /> f 1projects17394N uaslenwplq 120013 942gw x Is Page 43 of 43 <br />