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ANALYTICAL METHODOLOGY <br /> Halogenated Volatile Organics by Purge & Trap and GC-ELCD <br /> WATER - Method 601 or $010 <br /> A 5 ml sample volume is purged on a suitable purge and trap system with <br /> � ? helium. The purged sample is analyzed on a Gas Chromatograph equipped <br /> with an Electrolytic Conductivity (Hall) Detector (ELCD). Either an SP1000 <br /> on Carbopack Bpacked 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 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 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 /> is aliquoted using a similar technique which discards exposed sample <br /> j 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 /> C[;7:mWEST ANALYTICAL LABORATORIES.INC. <br />