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a <br /> t <br /> ll� <br /> I <br /> # ANALYTICAL METHODOLOGY <br /> E + BTEX (Benzene, Toluene, Ethyl Benzene, and Xylenes) by Purge & Trap and <br /> GC-PID <br /> i� <br /> i <br /> s WATER - Method 602 or 8020 <br /> €€ s A 5 ml sample volume, or 5 ml of a suitable dilution, is purged on a <br /> k ' suitable <br /> purge and trap system with helium. The purged sample is analyzed <br /> on a Gas Chromatograph equipped with a Photoionization Detector (PID), A <br /> packed column is used to separate the compounds. <br /> z <br /> SOIL - Method 8020 <br /> A 10 gram, or other appripriate aliquot of soil, is weighed into a clean <br /> f VOA vial. Soils received in brass core tubes are sampled by discarding 2-5 i <br /> y centimeters of soil from each end of the tubes (this is done to reduce the <br /> passibility of analyzing a portion of soil that has been exposed to sampling <br /> i technique contaminaticn , <br /> - ) Equal aliquots of soil are then removed from <br /> w 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 /> h, <br /> the soil and the soil is shaken with the solvent. 100 u1 of the extract, or . <br /> areduced 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 /> k { <br /> ...E I <br /> CHEM WESTANALYfICAL LABORATORIES,INC. <br />