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} <br /> ANALYTICAL METHODOLOGY <br /> Total Petroleum Hydrocarbons (TPH) Extractables by GC--FM <br /> Extraction Procedure: <br /> WATER <br /> A 1 liter sample is poured into a 2 liter separatory funnel. 3xl00 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 /> r <br /> SOIL -- <br /> A 30 gram, or other appropriate aliquot of soil, is mixed with 10 grams of <br /> { washed sodium sulfate. 160 mis of methylene chloride iadded,,to:the soil <br /> c <br /> and placed on a mechanical shaker for 1 hour. The liquid is decanted off <br /> and .the process is repeated with h an additional SEF ml 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. j <br /> GC :ANALYSIS - E <br /> P I <br /> An appropriate volume of the sample extract is injected into a Gas ! <br /> Chromatograph equipped with a .Flame Ionization Derectcx'-(FID),'a split/ <br /> splitless capillary arYinJector (operated in the spIatless mode) and j <br /> a fused <br /> silica capillary column. The TPH fraction is.quaniatated as gasoline and/or <br /> 92 diesel fuel (and/or different petroleumhydrocarbon fuel types if <br /> requested, such as JP-4 jet. fuel). based on relative retention times and # <br /> 77. <br /> _-- examination-of the elution profale. The TPH:fxacti:on quantitation is based - vl- <br /> an .chromato ra hic <br /> g p peak areas against a'..multipoint standard curve. <br /> j <br /> ` CHEMWESTANALY]CAL LASORATORIES.INC. <br />