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ANALYTICAL METHODOLOGY <br /> BTEX (Benzene, Toluene, Ethyl Benzene, and <br /> Xylenes) by Purge & Trap and <br /> WATER - Method 602 or 8020 <br /> i <br /> A 5 ml sample volume, or 5 <br /> suitable purge and tri ml of a suitable dilution, is purged on a <br /> an a Gas Chromatograph stem with helium. The purged sample is analyzed <br /> packed column is used to separateped with aPhotoaonizatian Detector (PID). A <br /> 4the compounds. <br /> SOIL - <br /> Method 8020 <br /> A 10 gram, or other appropriate aliquot of soil, is weighed into a clean <br /> 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.'exposd to sampling <br /> technique contamination}. Equal ali p g <br /> each end of the tube.and combined anu the of sdE�l are then removed from <br /> is aliquoted using a similar techni VCi� vial: Soil:in jars or bags . a <br /> mer which discards exposed`sample <br /> surfaces. <br /> A 10 ml, or other appropriate volume of methanol, f <br /> the soil and the soil is shaken with the solvent. 160, uI'o added .to <br /> a reduced' ala of or Ofthe�N volume of a � e .extract, or <br /> laboratory su_table dilution is injected into 5 'ml of <br /> ry blank water and analyzed b <br /> samples. y the same'.technique used .for water <br /> f <br /> y <br /> i <br /> r <br /> r, <br /> ..._._ <br /> CHEMWEST ANALYTICAL LA <br /> BQRATORIES,INC. <br />