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r . <br /> - My - <br /> I' ANALYTICAL METHODOLOGY <br /> ti <br /> BTEX/TFH (Benzene, Toluene, Ethyl Benzene, and X lenes Total Fuel <br /> Hydrocarbons) by purge & Trap and GC-PID/FID <br /> � a <br /> WATER - Method 502 or 8020 (Modified for TPH) <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 Photoionization Detector (PID) and <br /> { a Flame Ionization Detector d k <br /> A(FID). pacecolumn is used to separate <br /> i' the compounds. p <br /> SOIL - Method 8020 (Modified for Tp <br /> H) <br /> K 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), Equi aliouots of soil are then removed from <br /> each end of the tube. and combined in the VOA vial. Soil in jars or bags <br /> via is aliquoted using a similar technique, which discards exposed 'sample <br /> � <br /> surfaces.. A 10 :ml, or other appropriate volume of methanol, is added to <br /> r= -the soil and the soil is shaken with the solvent, 100 ui of the extract, or <br /> f a reduced aliquot or volume of a suitable dilution, is injected into 5 ml of <br /> ' <br /> laboratory-,blank water and analyzed by the same technique used for water <br /> samples. <br /> z <br /> CHEMWESTANALYrICAL LABORATORIES,INC. <br /> hE Y 4 <br />