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1� <br /> ANALYTICAL METHODOLOGY <br /> z <br /> i <br /> BTEX (Benzene, Toluene, Ethyl Benzene, and Xylenes) by Purge b 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). A <br /> ' packed column is used to separate the compounds. <br /> i <br /> a^ SOIL 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 2-5 <br /> centimeters of soil from each and of the tubes (this is done to reduce the <br /> passibility of analyzing a portion of soil that has been exposed to sampling <br /> ,-, technique. contamination). Equal aliquots of soil. are then removed from <br /> � <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 volu me 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 /> q laboratory Wank water and analyzed by the same technique used for water <br /> samples. <br /> Y <br /> ti <br /> 3{ ih j <br /> I I <br /> t { ' <br /> � Ih9 i <br /> 1 <br /> L S <br /> i <br /> CHEMN/EST ANALYTICAL LABORATORIES,INC. <br /> t <br /> S <br />