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p ' � <br /> ANALYTICAL METHODOLOGY <br /> BTEX (Benzene, Toluene, Ethyl Benzene, and Xylenes) by Purge & Trap and <br /> r <br /> GC-PID E <br /> WATER - Method 602 or- 8020 <br /> A 5 ml sample volume, or 5 ml of a suitable dilution, fills purged on a <br /> suitable purge and trap system with helium. The purged sample is analyzed <br /> I on a Gas Chromatograph equipped with a Photoionization 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 /> I i <br /> surfaces. A 10 ml, or other a PPro riate volume of methanol, is added to <br /> P <br /> the soil and the soil is shaken with the solvent.; 1001"uI of the extract, or <br /> a reduced aliquot or volume of a suitable dilution, isl injected into 5 ml of <br /> laboratory blank water and analyzed by the same <br /> technique used for water <br /> sa mples. <br /> M <br /> 9 <br /> 'M <br /> CHEMWEST ANALYTICAL LABORATORIES.'�INC. <br /> i <br /> E <br />