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� • i <br /> ' ANALYTICAL METHODOLOGY <br /> Total petroleum Hydrocarbons (TPH) Extractables by GC-FID <br /> 1 <br /> Extraction procedure: <br /> WATER - <br /> A 1 liter sample is poured into a 2 liter senaratory funnel. 3x100 ml <br /> extractions with methylene chloride (2 minute shake outs) are completed. <br /> The methylene c�loride is decanted off and concentrated to a 5 mI final <br /> volume. <br /> SOIL - <br /> A 30 gram, or other appropriate aliquot of soil, is mixed with 10 grams of <br /> was`zed sodium sulfate. 100 rws of l <br /> methylene chloride is added to the soi <br /> and placed on a mechanical s'esker for 1 hour. The licuid is decanted off <br /> nal 50 ml 61f metiylene <br /> and the process is solventeated extractsth an are filtered oe• <br /> The combined sothrough sodium sulfate and the <br /> extract is concentrated to a 5 ml final volume. <br /> GC ANALYSIS - <br /> An appropriate volume of the sample extract is in3ected into a Gas <br /> Chromatograph equipped with a y1ame Ionization Detector (FID), a split/ <br /> splitless capillary infector (operated in the splitless mode) , and a fused <br /> silica capillary column. The TPH fraction is quantitated as gasoline and/or <br /> 42 diesel fuel, (and/or different petroleum hydrocarbon fuel types if <br /> requested, such as Jp-4 3et fuel) based on relative retention times and <br /> examination of the elution profile. The TPH fraction tanda dt t2on is based <br /> on chromatographic peak areas against a multipoint <br /> 1 <br /> CHEVIVVESTANALYTICAL LABCRATCRU INC <br />