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'Y 1 <br /> i•d <br /> W f <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 <br /> suitable purge and trap system with helium. The purged sample is analyzed <br /> on a Gas Chromatograph equipped with a Flame Ionization Detector (FID). <br /> A packed column is used to 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 <br /> VOA vial. Soils received in brass cora tubes are sampled by discarding 2-5 <br /> centimeters of soil from each end of the tubas (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 avpropriate 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 />