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COLUMBIA ANALYTICAL SERVICES,INC. <br /> Analytical Report <br /> • Client ARCO Products Company Service Request: S9701747 <br /> Project: 20805-146 01O/TO#20682 0012168 STOCKTON Date Collected: NA <br /> Sample Matrix: Air Date Received: NA <br /> BTEX and Total Volatile Hydrocarbons <br /> Sample Name Method Blank Units mg/m3 <br /> Lab Code S970912-VB1 Basis NA <br /> Test Notes <br /> Prep Analysis Dilution Date Date Result <br /> Analyte Method Method Factor Extracted Analyzed Result Notes <br /> Benzene 5030 8020 l NA 9/12/97 <50 <br /> Toluene 5030 8020 1 NA 9/12/97 <50 <br /> Ethylbenzene 5030 8020 1 NA 9112/97 <50 <br /> Xylenes,Total 5030 8020 1 NA 9/12/97 <150 <br /> • TPH as Gasoline' 5030 8015M 1 NA 9/12/97 <250 <br /> • TPH as gasoline is deemed as C6(benzene)through C I2(dodecane)and uses a <br /> molecular weight of 100 to calculate the ppmv <br /> 1527/OZ0397p <br /> Page 7 <br />