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ANALYTICAL METHODOLOGY <br /> Halogenated Volatile Organics by Purge & Trap and GC-ELCD <br /> WATER - Method 601 or 8010 <br /> A 5 ml sample volume is purged on a suitable purge and trap system with <br /> analyzed on a Gas Chromatograph helium. The purged. sample i is graph equipped <br /> a. 0 <br /> with an Electrolytic Conductivity (Hall) Detector (ELCD). Either an SP1000 <br /> on Carbopack B packed column, or a DB-624 fused silica megabore column, <br /> is used to separate the compounds. <br /> SOIL- - Method 8010 <br /> A 10 gram,. or othe* clean <br /> r appropriate aliquot of soil, is weighed into a <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 /> "look, 'iechftique contamination). Equal aliquots of soil are then removed from <br /> of the tube apo combined in the VOA vial. <br /> each end 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 shakbn with the solvent: 109 ul of the extract, or <br /> a reduced aliquot or v'olume of a suitable dilution; is injected into 5 ml of <br /> laboratory blank water and analyzed by the same technique used for water <br /> admples. <br /> CHENWIEST ANAMICAL LABORMORIES.INC. <br />