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3 <br /> I <br /> ANALYTICAL METHODOLOGY <br /> tr <br /> Total Petroleum Hydrocarbons (TPH) Extractables by GC-FID <br /> Extraction Procedure: <br /> r- <br /> WATER - <br /> A 1 liter sample is poured into a 2 liter separatory funnel. 3x109 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 /> P-+ <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 51.6 ml of methylene chloride. <br /> The combined solvent extracts are filtered through sodium sulfate and the <br /> F extract is concentrated to a •5 ml final volume <br /> r, F <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 ' <br /> ( / 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 uantitation is .based <br /> q <br /> on chromatographic peak areas against a multipoint standard curve. <br /> Li <br /> i <br /> CHEMWEST ANALYTICAL LABORATORIES.INC. <br /> i <br /> it <br /> s <br /> `" ..1•::'� `'- ,` ..,: ,. '- Ali <br />