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p' <br /> I: <br /> t ANALYTICAL METHODOLOGY <br /> BTEX (Benzene, Toluene, Ethyl Benzene, and Xylenes) by Purge & Trap and <br /> GC--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 /> E. suitable purge and trap system with helium. The purged sample is analyzed <br /> on a Gas Chromatograph equipped with a Photoionization Detector (PID). A <br /> packed column is used to separate the compounds. <br /> 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 2-5 i <br /> { cen-ameters of soil from each end of the tubes (this is done to reduce the <br /> possibility of analyzing a portion of soil that has been exposed to sampling <br /> technique contamination). Equal aliquots of soil are. then .removed from <br /> r each end of the tube and combined in the VOA vial. Soil in jars or.bags <br /> r ► :. is ali.quoted using a similar technique, which discards exposed.sample <br /> surfaces. A 10 ml, or other appropriate volume of methano3, is added to <br /> t: the soil and the sail is zhaken with the solvent. 160.ul of the `extract, or <br /> a reduced aliquot or.volume of a suitable dilution, is injected into 5 ml.of <br /> laboratory blank water and analyzed by the sane technique used for water <br /> samples. <br /> i $f. <br /> !I <br /> 6-1 <br /> 0. <br /> LJ <br /> t <br /> CHEMWEST ANALYTICAL LABORA'TMIES,INC. <br /> �z' <br />