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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 /> volu me. <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 /> CHEMWEST ANALYTICAL LABORATORIES,INC. <br />