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Table 2:Historical Groundwater Gauging and Analytical Results <br /> ARCO Service Station No.5469 <br /> Explanations: <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=Tertiary butyl alcohol <br /> DIPE=Di-isopropyl ether <br /> ETBE=Ethyl tertiary butyl ether <br /> TAME=Tertiary amyl methyl ether <br /> 1,2-DCA =1,2-Dirhioroethane <br /> EDB=1,2-Dibromoethane. <br /> D.O.=Dissolved Oxygen:rounded to the nearest tenth prior to first quarter 2008 +� . <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 for TOC Elevation and feet below mean sea level for Calc.GW Elev. <br /> mg/L=Milligram per liter <br /> tig1L=Microgram per liter <br /> <=Analyte was not detected above the specified method reporting limit <br /> -=Not measured or analyzed <br /> Notes: <br /> INA=Well Inaccessible;not sampled <br /> J=Estimated value(less than the method reporting limit and greater than or equal to the method detection limit) <br /> N=Identity of contaminant uncertain(hydrocarbon pattern atypical of Indicated analyte);see lab report <br /> NP=Well not purged prior to sampling <br /> NS=Well not sampled <br /> R=Data rejected(data determined to be unreliable by laboratory) <br /> SA=Sampled semi-annually <br /> Beginning in the first quarter 2008,the carbon range for GRO was changed from C4-C12 to C6-C12. <br /> 5469 Tebles.xlsx Page 12 of 12 <br /> v <br />