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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 Photoionizatich Detector (PID) and <br /> a Flame Ionization Detector (FID). A packed column is used to - separate <br /> the compounds. <br /> F . <br /> SOIL - Method 8020 (Modified for TPH) <br /> A 10 gram, or other appropriatealiquot 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 .removedfrom <br /> each end of the tube and combined in 'the VOA vial. Soil din jars or' hags <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 /> t <br /> f <br /> CHEMWEST ANALYTICAL LABORATORIES,NC.' ,. <br />