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0C: T - 4 - 8 1 -r UE: 1 1 : O 'D F 04 <br /> 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 reparatory 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 grain, or other appraj r.3te alicuot of soil., is mixed with 10 grams of <br /> washed sodium sulfate. IeO rm.s 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 n1 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 /> CC 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 /> V 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 /> CHEVNEST ANA LYPCA, <br />