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TABLE 1 GROUNDWATER MONITORING DATA, FORMER EXXON RS 7-3942, 4444 NORTH PERSHTNG AVENUE, STOCKTON, CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration ( lL) <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> No Date (feet ms]) (feet) (feet ms]) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> UVB-MW2 05/05/99 7 75 1612 -837 000 693 366 457 225 5,510 35 8 <br /> 08/20/99 1753 -9 78 000 73 0 759 120 252 2,430 104 <br /> 12/06/99 1768 -993 000 23 <1 <1 <1 600 9 4 <br /> 02/29/00 15 33 -758 000 27 12 5 7 5 2 320 <1 <br /> 05/16/00 1508 -733 000 87 14 28 4 680 75 <br /> 09/11/00 17 55 -9 80 000 330 7 1 29 27 2,100 <2 5 <br /> 12/13/00 1741 -966 000 120 180 19 124 1,800 <2 5 <br /> 03/08/01 16.54 -8.79 0,00 180 210 44 193 2,700 4 4 <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 clue 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 /> teet msl Feet relative to mean sea level <br /> f 1piojects1739421nmsterlwpVg30113942gw xis Page 40 of 41 <br />