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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 /> UVB-MW2 06/21/01 775 <5* <br /> UVB-MW2 09/20/01 775 1913 -1138 000 24 3 6 13 119 1,300 <0 5 <br /> UVB-MW21 12/04/01 7 74 1892 -11 18 000 41 <0 5 092 119 330 <5* <br /> UVB-MW2 03/05/02 774 1800 -1026 000 112 350 110 410 1,760 h 550 <br /> UVB-MW2 03/05/02 774 <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-C 12 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 /> I <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 1187 from HLA <br /> Water sample taken fiom SW2 on 17 February 1994 was labeled as AS2 on chain of custody and laboratory results <br /> i <br /> g lprojects%73942Lnasterlwp1g030213942gw Ab Page 39 of 39 <br />