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ill <br /> ANALYTICAL METHODOLOGY <br /> Total Petroleum Hydrocarbons (TPH) Extractables by GC-FID <br /> i Extraction Procedure: <br /> WATER -- Luft Field Manual <br /> } i <br /> A 1 liter sample is poured into a 2 liter separatory funnel. 3x100 ml extractions <br /> with methylene chloride (2 minute shake outs are completed. The methylene chloride <br /> is decanted off and concentrated to a 5 ml final volume. <br /> SOIL - Luft Field Manual <br /> A 30 gram, or other aMropriate aliquot of soil., is mixed with 10 grams of washed <br /> } sodium`sulfate. 100 mis of methylene chloride is added to the soil and placed on a <br /> mechanical shaker for 1 hour. The liquid i9 decanted off and the process is repeated <br /> with an additional 50 ml of methylene chlnride. The combined extracts are <br /> �J filtered through sodium sulfate and the extract is concentrated to a 5 ml final <br /> volume. <br /> r <br /> GC'ANALYSIS <br /> An appropriate volume of the sample extract is injected into a Gas Chromhograph <br /> equipped with a Flame ronixatdon Detector (F'ID), a split/gAitless.eaPMasY i'7 <br /> (operated in the splitless mode), and a fused silica capillary column. The TPH <br /> fraction is quantitated as gasoline and/or #2 diesel.fuel (and/or different petroleum <br /> hydrocarbon fuel types if requested, such as J13-4 jet fuel) based on relative <br /> retention times and examination of the elution profile. The TPH fraction <br /> t <br /> quantitation is based on chromatographic peak areas against a multipoint standard <br /> 4 curve. <br />- 4 <br /> } <br /> I� t <br /> CHEM4YESTANALYRCAL LABORATORIES.INC. <br />