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l . <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 separatory funnel. 3x100 ml <br /> extractions with methylene chloride (27, 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 gram, or other."appropriate aliquot of soil, is mixed' with 10 -grams of <br /> washed sodium sulfate. 104" 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 50 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.. <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 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 /> C 1IEMWE�TA.i 1ALYTICAL_,-;3CRAi -RIE--,IAC. <br />