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ANALYTICAL METHODOLOGY <br />Total Petroleum Hydrocarbons (TPH) Extractables by GC -FID <br />Extraction Procedure: <br />WATER - <br />A 1 liter sample is poured into a 2 liter separatory funnel. 3x100 ml <br />extractions with methylene chloride (2 minute shake outs) are completed. <br />The methylene chloride is decanted off and concentrated to a 5 ml final <br />volume. <br />SOIL - <br />A 30 gram, or other appropriate aliquot of soil, is mixed with 10 grams of <br />washed sodium sulfate. 100 mis of methylene chloride is added to the soil <br />and placed on a mechanical shaker for 1 hour. The liquid is decanted off <br />and. the process is repeated with an additional 50 ml of methylene chloride. <br />The combined solvent extracts are filtered through 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 injected into a Gas <br />Chromatograph equipped with a Flame Ionization Detector (FID), a split/ <br />splitless capillary injector (operated in the splitless mode), and a fused <br />silica capillary column. The TPH fraction is quantitated as gasoline and/or - <br />#2 diesel fuel (and/or different petroleum hydrocarbon fuel types if <br />requested, such as JP -4 jet fuel) based on relative retention times and <br />examination of the elution profile. The TPH fraction quantitation is based <br />on chromatographic peak areas against a multipoint standard curve. <br />CHENIVâś“E-SI ANALYIICAI lABORA10 ICS. iNC <br />