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I <br /> T <br /> E <br /> I <br /> ANALYTICAL METHODOLOGY <br /> f <br /> Aromatic Volatile Organics by Purge & Trap and PID/FID <br /> E <br /> WATER - Method 642 or 8020 <br /> A 5 ml sample volume, or 5 ml of a suitable dilution, is purged on a <br /> Tekmar LSC-2/ALS purge and trap system with helium. The purged sample <br /> is analyzed on a Varian 3400 GC equipped with a Photoionization Detector <br /> and a Flame Ionization Detector (PID/FID). A packed column is used to <br /> separate the compounds. <br />{ SOIL - Method 8020 <br />} A 10 gram or other appropriate aliquot of soil is weighed into a clean VOA <br /> vial. Soils received in brass core tubes are sampled by discarding 1-2 <br /> inches 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 /> t: is aliquoted with a similar technique which discards exposed sample <br /> surfaces. A 10 ml or other appropriate volume of methanol .is added to the <br /> f soil and the soil is shaken with the solvent. 100 ul of the extract, or a <br /> reduced aliquot or volume of a suitable dilution, is injected into 5 ml of <br />#. laboratory blank water and then analyzed by the same technique as a water <br /> sample. <br /> r <br /> i <br /> II� <br /> 1 . <br /> f <br /> CHEMWESTANALYfICAL LABORATbMES,INC. <br />