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s <br /> ANALYTICAL2 METHODOLOGY <br /> BTEX (Benzene, Toluene, Ethyl Benzene, and. Xylenes) ":by Purge & .Trap and <br /> GC-PID <br /> WATER - ,,Method 502 or 8020 <br /> A 5 ml sample volume, or 5'ml, of a, suitable' dilution, is purged on a <br /> suitable purge and trap system with, helium. The purged sample is analyzed <br /> on a Gas Chromatograph equipped with a Photoionizatio.n Detector (PID). A <br /> packed column is used to separate, the. compounds. <br /> SOIL - Method 8020 <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 /> 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 /> samples. <br /> i <br />`€ CHEMWESTANAI.'!T.iCrL_.-3C?ATCRIES.INC. <br />