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F <br /> 1 <br />' ANALYTICAL METHODOLOGY <br />' Total Petroleum Hydrocarbons (TPH) Extractables GC/FID <br /> EXTRACTION PROCEDURE: <br /> WATER - <br /> IF <br /> 1 liter sample is poured into a 2 liter separatory funnel . <br /> 3x100 ml aliquots of methylene chloride (2 minute shake outs) <br /> are completed. The methylene chloride is decanted off and <br />' concentrated to a 5 ml final volume. <br /> J <br /> SOIL -- <br /> C30 grams of soil is mixed with 10 grams of washed sodium sulfate. <br /> 100 mis of methylene chloride is added to the soil and placed on <br />' a mechanical shaker for 1 hour. The liquid is decanted off <br /> )� and the process is repeated with an additional 50 ml of methylene <br /> chloride. The combined solvent extract is filtered through <br /> sodium sulfate and the extract is concentrated to a 5 ml <br />' t final volume. <br /> V <br /> GC ANALYSIS - <br /> 3 ul ' s of the sample extract is injected into a Varian 3400 GC <br /> equipped with a Flame Ionization Detector, (FID) , a split/splitless <br />' capillary injector operated in the splitless mode and a 30 meter, <br /> 0 .25 mm ID, DB-5 capillary column temperature programmed <br /> from 40 to 280 deg C. The TPH fraction was quantitated as gasoline <br />' and/or diesel standards based on relative retention times against <br /> a 3 point curve (gasoline standard points: 50, 200 , 500 ug/ml <br /> and diesel standard points: 100 , 500, 2000, ug/ml) . The TPH <br /> 1 fraction quantitation is based on chromatographic peak areas. <br /> 1�. <br /> I <br /> 1[ � 1 <br /> i <br /> _ CHEMWEST ANALYTICAL LABORATORIES INC <br />