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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 dilation, is purged on a suitable purge <br /> and trap system with helium. The purged sample is analyzed on a Gas Chromatograph <br /> equipped with a Photoionization Detector (PID). A fused silica megabore column is <br /> used to separate the compounds. <br />' SOIL - Method 8020 <br />' A 10 gram, or other appropriate aliquot of soil, is weighed into a clean VOA vial. <br /> Soils received in brass core tubes are sampled by discarding 2-5 centimeters of soil <br /> from each end of the tubes (this is done to reduce the possibility of analyzing a portion <br /> of soil that has been exposed to sampling technique contamination). Equal aliquots of <br /> soil are then removed from each end of the tube and combined in the VOA vial. Soil <br /> in jars or bags is aliquoted using a similar technique, which discards exposed sample <br />' surfaces. A 10 ml, or other appropriate volume of methanol, is added to the soil and <br /> the soil is shaken with the solvent. 100 ul of the extract, or a reduced aliquot or <br /> volume of a suitable dilution, is injected into 5 ml of laboratory blank water and <br />' analyzed by the same technique used for water samples. <br /> 1 <br /> COMPUCHFM WESTERN DIVISION <br /> 1 <br />