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GEOMATRIX <br /> TABLE 4 <br /> HISTORICAL GROUNDWATER ANALYTICAL RESULTS — 1998 INVESTIGATION <br /> Roberts Property <br /> Vernalis, California <br /> Concentrations reported in micrograms per liter(pg/I) <br /> Date Ethyl- <br /> Sample IDS Sampled TPHd TPHmo TPHg Benzene benzene Toluene Xylene MtBE <br /> MW2-R002-GW 7/28/982 230 <50' <100 <0.3 <0.5 <0.3 <0.6 <10 <br /> 11/5/983 <50 NA NA NA NA NA NA NA <br /> MW3-R003-GW 7/28/982 53 <50 <100 <0.3 <0.5 <0.3 <0.6 <10 <br /> 11/5/983 <50 NA NA NA NA NA NA NA <br /> MW4-R001-GW 7/28/98'- 150 <50 <100 <0.3 <0.5 <0.3 <0.6 <10 <br /> 11/5/98 3 <50 NA NA NA NA NA NA NA <br /> Notes: <br /> Designates monitoring well location and sample number. <br /> 2 Groundwater samples collected by Radian International and analyzed by Core Laboratories of Pasadena,California,and/or <br /> American Environmental Network of Pleasant Hill, California, and analyzed for TPHd,TPHmo,and TPI-Ig using EPA Method <br /> 8015M; and for benzene,toluene,ethylbenzene, xylenes,and MtBE using EPA Method 8020. <br /> 3 Groundwater samples collected by Geomatrix Consultants, Inc.,and analyzed by Friedman and Bruya of Seattle, Washington, <br /> and analyzed for TPHd using EPA Method 8015M. Sample extracts were prepared with a silica gel procedure(based on EPA <br /> Method 3630M)prior to TPHd analysis. <br /> 4 <=Analyte was not detected above detection limit indicated. <br /> Abbreviations: <br /> TPHd=Total petroleum hydrocarbons quantified as diesel. MtBE=Methyl tert-butyl ether. <br /> TPHmo =Total petroleum hydrocarbons quantified as motor oil. NA =Not analyzed. <br /> TPHg=Total petroleum hydrocarbons quantified as gasoline. <br /> i:\doc safe\5000s\5011.001\tbl4.xls <br />