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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 />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 <br />centimeters 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 />each end of the tube and combined in the VOA vial. Soil in jars or bags <br />is aliquoted 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 ml of <br />laboratory blank water and analyzed by the same technique used for water <br />sa mples. <br />CHEMWEST ANALYTICAL LABORATORIES, INC. <br />