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{ <br /> ANALYTICAL METHODOLOGY <br /> BTEX (Benzene, Toluene, Ethyl Benzene, and Xylenes) by purge & Trap and <br /> t'F GC-PID <br /> ,.� WATER - Method 602 or 8020 <br /> s <br /> nA 5 ml sample volume, or 5 ml of a suitable dilution, is purged on a <br /> �`4 suitable 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 /> %-A <br /> { SOIL, - Method 80291 <br /> 5 <br /> j <br /> A 10 gram, or other appropriate aliquot of sail, is-weighed into a clean <br /> VOA vial Softs received in brass'core tubes are sampled by.discarding 2-5 <br /> # centimeters of soil from each erd of the tubes (this is done.to reduce the <br /> possibility of analyzing a'portion of:'s(Al that has been exposed to sampling <br /> F <br /> technique.contamination). Equal aliots )f so-I are.there removed.f7om, <br /> each end of the tube and combined in the VOA viai.. Soil in jars ox bags <br /> ., <br /> is a3i <br /> quoted using similar technique, :which discards exposedsample <br /> surfaces. A I0ml, or other. app <br /> rop�ria;a .volume of.methanol, is. added to <br /> the: soil and the soil.is shaker, with the solvent..2 100 ul of the extracts or <br /> a reduced aliquot or. volume of a suitable dilution,:is injected into 5.yiT3. of <br /> laboratory blank water and analyzed by..the same technique used. for water <br /> M samples. <br /> - � I <br /> J <br /> CHEMWESTANALYTICAL LABORATORIES,INC. <br /> of <br /> ri <br />