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COLUMBIA ANALYTICAL SERVICES, INC. <br /> Analytical Report <br /> Client: ARCO Products Company Service Request: S9700685 <br /> Project: 20805-146 010/TO#20682 0012168 STOCKTON Date Collected: 4116/97 <br /> Sample Matrix: Aar Date Received: 4117/97 <br /> Date Extracted: NA <br /> Date Analyzed: 4/17197 <br /> BTEX and Total Volatile Hydrocarbons <br /> EPA Methods 5030/8020/Modified 8015 <br /> Sample Name Method Blank <br /> Lab Code 5970417-VB 1 <br /> MRLs Results <br /> mg/m3 uL/L(ppmv) mg/m3 uL/L (ppmv) <br /> Benzene 0 4 01 ND ND <br /> Toluene 0 4 01 ND ND <br /> Ethylbenzene 05 01 ND ND <br /> Xylenes, Total 0 9 0 2 ND ND <br /> Total Volatile Hydrocarbons <br /> C1 -05 12 5 ND ND <br /> C6-C12 20 5 ND ND <br /> TPH as Gasoline* 20 5 ND ND <br /> Methyl tert-Butyl Ether 3 14 ND ND <br /> * TPH as gasoline as defined as C6 (benzene)through C12 (dodecane)and uses a <br /> molecular weight of 100 to calculate the ppmv <br /> I.CSl102I90 <br /> Page 5 <br />