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.. p <br /> F ANALYTICAL METHODOLOGY <br /> i ; <br /> ETEX (Benzene, Toluene, Ethyl Benzene, and Xylenes) by .Purge & Trap and <br /> GC-PID <br /> t WATER - Method 602 or 8020 <br /> 4 A 5 ml sample volume, or 5 ml of a suitable dilution, is purged on a <br /> suitable purge and trap system with helium. The purged sample is analyzed <br /> p on a Gas Chromatograph equipped with a Photoicnization Detector (PID). A <br /> Gyp packed column is used to separate the compounds. <br /> SOIL - Method 8020 <br /> fm-; A. l0 gram, or',other appropriate aliquot of soil, is weighed into a clean <br /> VOA vial. Soilsreceived in brass core tubes are sampled by discarding .2-5 <br /> centimeters of soil from each. end of the tubes (this is done to reduce the <br /> t <br /> passibility of analyzing a portion of soil that has been exposed to sampling <br /> <%echnique ,contamination). Equal aliquots of soil are then removed from <br /> eachend of the tube and combined in .the VOA vial. Soil in ,jars or bags f <br /> is aliquoted using a similar technique, which discards exposed sample <br /> pP <br /> surfaces. A 10 mi, or other appropriate Volume of methanol, is added to j <br /> - { � t <br /> he?: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, , injected into 5 ml of ' <br /> laboratory blank water and: analyzed by the same technique used for water <br /> samples. ; <br /> } i <br /> I <br /> 3 fir. <br /> x I <br /> s 'T r iFmy _ <br /> L <br /> s <br /> CHEsV14'JESi ANALYFIC. L LABCRA CRIES.!NC. <br />