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1 <br /> ANALYTICAL METHODOLOGY <br /> BTEX Benzene, Toluene, Ethyl Benzene, and Xylenes) by Purge Trap and <br /> GC-PID <br /> WATER - Method 602 or 8020 <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). <br /> packed column is used to separate the compounds. <br /> SOII. - Method 8020 <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 to reduce e <br /> centimeters of soil from each end of the ortion of soil thatshas ls is done <br /> been exposed to sampling <br /> possibility of analyzing a p <br /> technique contamination). Equal aliquots of soil are then in removed from <br /> each end of the tube and combined in the VOA vial. 5oilosedl sample ars or bags <br /> is aliquoted using a similar technique,te which mesofrmethanol, is added to <br /> surfaces. A 10 ml, or other app Pt. <br /> the alituotsor volumekof alsuitable dil tion,lis injected into t5aml of <br /> a reduced. q <br /> laboratory blank water and analyzed by the same technique used for water <br /> samples. <br /> CHE iNES ANAOTiCAL I.NHCRATCRIES.INC. <br /> t <br /> i <br /> 1� r <br /> rnm.m®110=MINN <br />