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1 ' ANALYTICAL METHODOLOGY ' Halogenated Volatile Organics by Purge & Trap and GC-ELCD ' WATER - Method 601 or 8010 A 5 ml sample volume is purged on a suitable purge and trap system with helium. The purged sample is analyzed on a Gas Chromatograph equipped with an Electrolytic Conductivity (Hall) Detector (ELCD). A DB-624 fused silica megabore column is used to ' separate the compounds. ' SOIL - Method 8010 ' A 10 gram, or other appropriate aliquot of soil, is weighed into a clean VOA vial. Soils received in brass core tubes are sampled by discarding 2-5 centimeters of soil from each end of the tubes (this is done to reduce the possibility of analyzing a portion of soil that has been exposed to sampling technique contamination). Equal aliquots of soil are then removed from each end of the tube and combined in the VOA vial. Soil in jars or bags is aliquoted using a similar technique which discards exposed sample surfaces. A 10 ml, or other appropriate ' volume of methanol, is added to the soil and the soil is shaken with the solvent. 100 ul of the extract, or a reduced aliquot or volume of a suitable dilution, is injected into 5 ml of laboratory blank water and analyzed by the same technique used for water samples. In the past it has been CHEMWEST's Policy to use the following three surrogates for methods 601 and 8010 analysis: Orthochlorotoluene, Bromochloromethane and ' Bromofluorobenzene. However, only Bromochloromethane and Bromofluorobenzene were reported. This policy has been changed. CHEMWEST will continue to use all three surrogates; however, due to the variability associated with brominated compounds in ' 8010/601 (Hall Analysis), we will now be reporting Orthochlorotoluene instead of Bromofluorobenzene in 8010/601 analysis. Therefore, the two surrogates which will now be reported for 8010/601 analysis are Orthochlorotoluene and Bromochloromethane. 1 COMPUCl TM WFSTFRN DIVISION 1