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w <br /> ANALYTICAL METHODOLOGY <br /> I <br /> HTEX (3enzene, Toluene, Ethyl Benzene, and Xylenes) by Purge & Trap and <br /> GC-PID <br /> WATER - Method 662 or 8620 <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 /> t on a Gas Chromatograph equipped with a Photoionization Detector (PID). A <br /> packed column is used to separate the compounds. <br /> f;..d <br /> w� SOIL - Method 8626 <br /> i f <br /> A 16 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 /> f 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 /> l � is-aliquoted using' a similar technique, which discards exposed sample <br /> s, <br /> surfaces. A 16 re,); or other appropriatevolume of methanol, is added to <br /> the soil and the soil is shaken with the solvent. 166 ul of the extract, or <br /> ➢i a 'reduced aliquot'or volume of a suitable dilution,.is injected into 5 ml of <br /> y laboratory blank water and analyzed by the same technique used for, water <br /> k samples. <br /> l �"7 <br /> s <br /> -- -- ------- --- -- ------ --- - __---- ------- -- - --..-- -- —- - - -----.-. - - _. - ------ -- --- -._.-7 ----- --- <br /> j CHEMWEST ANALYTICAL LABORATORIES;INC. <br /> r � <br />