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• s • <br /> 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 msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> UVB-MW2 08/26/97 d 7 75 20 87 -13 12 000 12,000 23,000 2,700 13,000 120,000 1,300 <br /> 10/02/97 -- -- -- <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 11/11/97 2143 -13 68 000 <0 5 099 066 41 <50 <2 5 <br /> 03/03/98 15 95 -820 000 2,200 190 <20 1,300 12,000 <100 <br /> 03/03/98 <br /> <20* <br /> 05/20/98 15 82 -807 000 2,500 180 950 1,300 16,000 560 <br /> 05/20/98 <14* <br /> 08/19/98 1703 -928 000 14 4 8 2 7 24 250 16 <br /> 08/19/98 <2 0* <br /> 11/18/98 1753 -978 000 230 80 25 23 760 <25 <br /> 03/30/99 1663 -888 000 805 76 1 366 240 6,290 <20 <br /> 05/05/99 16 12 -837 000 693 366 457 225 5,510 358 <br /> 08/20/99 1753 -978 000 73 0 7 59 120 25 2 2,430 104 <br /> 12/06/99 1768 -993 000 23 <1 <1 <1 600 9 4 <br /> 02/29/00 1533 -758 000 27 12 5 7 5 2 320 <1 <br /> 05/16/00 1508 -733 000 87 14 2 8 4 680 7 5 <br /> 09/11/00 17.55 -980 000 330 7 1 29 27 2,100 <2 5 <br /> a Water in well may be residual water in end cap <br /> b Unidentified hydiocaibons present <br /> c Hydrocarbons ranging from C6-C12 identified on the gasoline sample chromatogram <br /> d Analytical iesults may be incorrect due to possible mislabeling of samples for UVB-MW1 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 hydiocarbons <br /> I PH-g Total Petroleum Hydrocarbons as gasoline <br /> MTBE Methyl t-butyl ether <br /> * Analyzed by EPA Method 8260 <br /> 1 1pruIeLls173942yuasici4%plg9OOU942bw As Pa;e 36 of 37 <br />