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COLUMBIA ANALYTICAL SERVICES,INC. <br /> Analytical Report <br /> Client: ARCO Products Company Service Request: S9701747 <br /> Protect 20805-146 010/T0920682 0012168 STOCKTON Date Collected: 919197 <br /> Sample Matrix Air Date Received: 9110/97 <br /> BTEX and Total Volatile Hydrocarbons <br /> Sample Name EFFLUENT Units mg/m3 <br /> Lab Code 59701747-002 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 9112197 <50 <br /> Toluene 5030 8020 1 NA 9/12197 <50 <br /> Ethylbe-A,— 5030 8020 1 NA 9112197 <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 gasoime is defined as C6(benzene)through C 12(dodecane)and uses a <br /> molecular weight of 100 to calculate the ppmv <br /> isamm597p <br /> Page 5 <br />