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TABLE 2 <br /> Historical Groundwater Monitoring &Analytical Data <br /> ARCO Service Station No. 6080 <br /> 85 E. Louise Avenue, Lathrop, CA <br /> Notes; <br /> GRO=Gasoline range organics <br /> B=Benzene <br /> T=Toluene <br /> E=Ethylbenzene <br /> X=Total xylenes <br /> MTBE=Methyl tert-butyl ether <br /> TBA=Tert-butyl alcohol <br /> DIPS=Di-isopropyl ether <br /> ETRE=Ethyl tert-butyl ether <br /> TAME=Tert-amyl methyi ether f <br /> 1,2-DCA =1,2-Dichloroethane <br /> D.O.=Dissolved Oxygen;rounded to the nearest tenth <br /> SPH=Separate-phase hydrocarbons <br /> TOC=Top of casing(surveyed) <br /> Calc.GW Elev.=Calculated groundwater elevation=TOC-Depth to Water+0.75*(Measured SPH Thickness);assuming a specific gravity of 0.75 for SPH <br /> ft-MSL=feet above mean sea level <br /> ni=Milligrams per liter <br /> i=Micrograms per liter <br /> <=Analyte was not detected above the specified method detection limit{MDL);except after 2006 Quarter 2 where reporting limits <br /> -=Not measured or analyzed <br /> Beginning 311412003-Ti and BTEX analyzed by EPA Method 82608 <br /> N=Identity of contaminant uncertain(hydrocarbon pattern atypical of indicated analyte);see lab report <br /> NP=Well not purged prior to sampling <br /> 6080 3007 Tables.xls Page 4 of 4 SECOR <br />