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COLUMBIA ANALYTICAL SERVICES,INC. <br /> Analytical Report <br /> • Client: ARCO Products Company Service Request: 59701747 <br /> Project 20805-146 01G/TO#20682 00/2168 STOCKTON Date Collected: 919197 <br /> Sample Matrix: Air Date Received: 9110/97 <br /> BTEX and Total Volatile Hydrocarbons <br /> Sample Name INFLUENT Units mg/m3 <br /> Lab Code S9701747-001 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 1 NA 9/12/97 34 <br /> Toluene 5030 8020 1 NA 9112197 190 <br /> Ethylbenzeno 5030 8020 1 NA 9/12/97 180 <br /> Xylenes,Total 5030 8020 1 NA 9112/97 1800 <br /> • <br /> TPH as Gasoline° 5030 8015M 1 NA 9/12/97 17,000 <br /> • TPH as gasoline is defined as C6(benzene)through C 12(dodecane)and uses a <br /> molecular weight of 100 to calculate the ppmv <br /> i13221=597P <br /> Page 3 <br />