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f <br /> ANALYTICAL METHODOLOGY <br /> 1 <br /> 5 <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,l�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 core tubes are sampled by discarding 2-5 <br /> centimeters of soil from each end of the tubes .(this done to reduce the <br /> possibility of analyzing a portion of soil that has beeln exposed to sampling <br /> technique contamination). Equal aliquots of soils are ,ythen 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, isl injected into 5 ml of <br /> laboratory blank water and analyzed by the same technique used for water <br /> sa mples. <br /> E <br /> I II <br /> i <br /> t <br /> CHEMWES7 ANALYTICAL LABORATORIES,]INC. <br />