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COLUMBIA ANALYTICAL SERVICES,INC. <br /> Analytical Report <br /> Client- ARCO Products Company Service Request: 59700685 <br /> Project: 20805-146 010frO##20682 00/2168 STOCKTON Date Collected: 4/16/97 <br /> Sample Matnx. Ayr Date Received: 4/17/97 <br /> Date Extracted: NA <br /> Date Analyzed: 4/17/97 <br /> BTEX and Total Volatile Hydrocarbons <br /> EPA Methods 5030/8020/Modtfied 8015 <br /> Sample Name Influent <br /> Lab Code 59700685-001 <br /> MRLs Results <br /> mg/m3 uL/L(ppmv) mg/m3 uL/L (ppmv) <br /> Benzene 0 4 01 50 16 <br /> Toluene 0 4 0 1 880 230 <br /> Ethylbenzene 05 01 200 46 <br /> Xylenes, Total 0 9 0 2 1300 300 <br /> Total Volatile Hydrocarbons <br /> C1 -C5 12 5 800 340 <br /> C6-C12 20 5 11000 2700 <br /> TPH as Gasoline* 20 5 11000 2700 <br /> Methyl tent-Butyl Ether 3 14 <60 C1 <20 C1 <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 /> C 1 The MRL was elevated due to lugh analyte concentration requiring sample dilution <br /> LCSJ102194 <br /> Page 3 <br />