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tANALYTICAL METHODOLOGY 0 ' 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. 1 ' 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 N 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: Otthochlorotoluene, Bromochloromethane and ' Bromofluorobenzene. However, only Bromochloromethane and Bromofluorobenzene were reported. This policy has been changed. C1-IEMWEST 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 COMP00I1:M WFSTFPN DN/UON