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i <br /> ANALYTICAL METHODOLOGY <br /> BTEX/TFH (Benzene, Toluene, Ethyl Benzene, and Xylenes/ Total Fuel <br /> Hydrocarbons) by Purge & Trap and GC-PID/FID <br /> WATER - Method 602 or 8020 (Modified for TPH) <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) and <br /> a Flame Ionization Detector (FID). A packed column is used to separate <br /> the compounds.., <br /> SOIL - Method 8020 (Modified for TPH) <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 /> samples. <br /> I <br /> CHEMWEST ANALYTICAL LASCRATORIES.INC.' <br />