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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(pg/L) <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> No _ Date (feet msl)- (feet) (feet ms]) (feet) Benzene Toluene benzene Xylenes TPH g MTBE <br /> UVB-MW2 05/05/99 775 1612 -837 000 693 366 457 225 5,510 35 8 <br /> 08/20/99 775 1753 -978 000 730 759 120 252 2,430 104 <br /> 12/06/99 775 17 68 -993 000 23 <1 <1 <1 600 9 4 <br /> 02/29/00 775 15 33 -758 000 27 12 5 7 5 2 320 <1 <br /> 05/16/00 775 15 08 -733 000 87 14 2 8 4 680 7 5 <br /> 09/11/00 7 75 1755 -9 80 000 330 7 1 29 27 2,100 <2 5 <br /> 12/13/00 775 1741 -966 000 120 180 19 124 1,800 <2 5 <br /> 03/08/01 775 1654 -879 000 180 210 44 193 2,700 4 4 <br /> 06/21/01 7 75 17 93 -1018 000 38 53 6 307 1,200 19 <br /> 06/21/01 7 75 <5* <br /> a Water in well may be residual water in end cap <br /> b Unidentified hydrocarbons present <br /> c Hydrocarbons ranging from C6-C12 identified on the gasoline sample chromatogram <br /> d Analytical 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 /> pg/L Micrograms per liter <br /> tees insl 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 /> g�projeeis173992tmasie6tiaplg60i13942gw As Page 37 of 37 <br />