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�. .MW <br /> SOIL GAS ANALYSIS <br /> Soil gas analysis is a highly effective, non-disruptive method for <br /> detecting, identifying, and defining the extent of surbsurface <br /> a contamination . By measuring the volatile components migrating to <br /> the surface above the area of contamination, the source area, plume <br /> extent and areas of high concentration can be determined . The main <br /> advantage of this approach to site investigations is that a much <br /> more thorough evaluation can be made at a lower costand with far <br /> less disturbance than drilling or the digging of test pits . <br /> Using a small-volume steel probe, soil gas samples are colelcted <br /> from shallow depths , determined by site conditions but. usually 1 <br /> peter . These samples are sealed under pressure in metal vials or <br /> on collectors and delivered to the laboratory. The appropriate <br /> analyses are performed using highly sensitive gas chromatographs <br /> equipped with electron capture, flame ionization, or photo <br /> ionization detectors . When detailed chemical speciation information <br /> is required for identification of the contaminants , evaluation of <br /> pollutant at.tenuat.ion or determination of the contaminant <br /> contribution from multiple sources , the analysis may use all of <br /> these detectors . Our analytical procedures are capable of <br /> detecting, from soil gas samples , the occurrence of most volatile <br /> organics in the groundwater at concentrations as low as 10 parts <br /> per trillion to 10 parts per billion depending upon the volatile <br /> and the detector . <br />