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ANALYTICAL METHODOLOGY <br />Total Petroleum Hydrocarbons (TPH) Extractables by GC -FID <br />Extraction Procedure: <br />WATER - Luft Field Manual <br />A 1 liter sample is poured into a 2 liter reparatory 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 appropriate 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 is decanted off and the process is repeated <br />with an additional 50 ml of methylene chloride. The combined solvent extracts are <br />filtered through sodium sulfate and the extract is concentrated to a 5 ml final <br />volu m e. <br />GC ANALYSIS - <br />An appropriate volume of the sample extract is injected into a Gas Chromatograph <br />equipped with a Flame Ionization Detector (FID), a split/ splitless capillary injector <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 petrcleu m <br />hydrocarbon fuel types if requested, such as JP -4 jet fuel) based on relative <br />retention times and examination of the elution profile. The TPH fraction <br />quantitation is based on chromatographic peak areas against a multipoint standard <br />curve. <br />CHEMWEST ANALYTICAL LABORATORIES '.C. <br />