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III <br /> ANALYTICAL METHODOLOGY <br /> ' Total Petroleum Hydrocarbons by Purge & Trap and GC-FID <br /> ' WATER - DHS Method - Luft Field Manual <br /> A 5 ml sample volume, or 5 ml of a suitable dilution, 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 Flame Ionization Detector (FID). A packed column is used to <br /> separate the compounds. <br /> ' SOIL - DHS Method - Luft Field Manual <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 /> COMPUCHEM WESTEnN DIVISION <br />