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4 <br /> i - <br /> OWNS <br /> 9 <br /> ;. ANALYTICAL METHODOLOGY <br /> BTEX (Benzene, Toluene, Ethyl Benzene, and Xylenes) by Purge & -rap and <br /> GG-PID <br /> WATER - Method 602 or 8020 <br /> A 5 ml sample volume, or 5 ml of a suitable dilution, is purged on a <br /> 9 suitable purge and trap system with helium. The purged sample is analyzed <br /> on a Gas Chromatograph equipped with a Photoicaization Detector (PID), A <br /> }' packed column is used to separate the compounds. <br /> v, SOiL - Method 8020 <br /> A '.10 gram, or other appropriate aliquot of soil, is weighed into a clean <br /> VOA vial: Soils received in brass core tubes are sampled by discarding.275 <br /> centimeters of soil from each end of the tubes (this is done to reduce the <br /> possibilityof analyzing :a portion of soil .that has been exposed to sampling , <br /> technique contamination). Equal aliquots of soil are then removed from <br /> each end of the tube and combined in the VOA vial. Soil. in jars or bags <br /> is aliq,ioted using a similar technique, which discards exposed sample. <br /> ' surfaces. A 10 ml, or other appropriate volume of methanol, is added to <br /> the soil and .the soil .is shaken with the solvent. 100 ul of the extract, .or <br /> a reduced..aliquot or volume of a suitable dilution, is injected into 5 tnl of <br /> laboratory 'blank water and analyzed by the same technique used far water <br /> f ; samples. <br /> . bar .. <br /> , <br /> , <br /> CHEMWEST ANALYTICAL LABORATORIES,INC. <br /> l <br /> F <br />