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_, kM <br /> i <br /> 1 <br /> ANALYTICAL METHODOLOGY <br /> Total Petroleum Hydrocarbons by Purge & Trap and GC-,,FID <br /> WATER - DHS Method - Luft Field Manual k <br /> 1 <br /> A 5 ml sa mple volu me, or 5 ml of a suitable dilution, i�hs purged on a <br /> suitable purge and trap system with helium. The 1purged 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. 'h <br /> SOIL - DHS Method - Luft Field Manual <br /> A 10ra m, or other appropriate ali not of soil, is� weighed into a clean <br /> 9q <br /> VOA vial. Soils received in brass core tubes aresampled 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 viral. 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 /> sa mples. <br /> i <br /> i <br /> j <br /> ,F <br /> CHEMWEST ANALYTICAL LABORATORIES,INC. I <br /> I i <br /> - - ---- ---- --__ _ter-- � -- -- - -- -- - <br />