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Modified active gas sampling
Modified Active Gas Sampling (MAGS) is an environmental engineering assessment technique which rapidly detects unsaturated soil source areas impacted by volatile organic compounds. The technique was developed by HSA Engineers & Scientists in Fort Myers, Florida in 2002, led by Richard Lewis, Steven Folsom, and Brian Moore. It is being used all over the United States, and has been adopted by the state of Florida in its Dry-cleaning Solvent Cleanup Program.〔(2007 EBJ Business Achievement Awards – Winners, Environmental Business Journal )〕
==Process==
MAGS involves the extraction and analysis of soil vapor from a piezometer screened through the unsaturated soil column for the purpose of locating unsaturated zone source material. According to the MAGS Manual, written by HSA and adopted by the Florida Department of Environmental Protection, MAGS is performed "by utilizing a typical regenerative blower fitted to a temporary soil vapor extraction well, (that )a large volume of soil can be assessed with a limited number of samples. While lacking the resolution of traditional soil sampling methods (e.g., discrete soil sampling, low flow active gas sampling, etc.), the statistical representativeness (in the sense of sample coverage) of MAGS results versus traditional methods is much greater. Moreover, the results of the assessment provide useful transport and exposure assessment information over traditional techniques. Lastly, MAGS is effective as both an initial site assessment and remedial assessment tool, in that, MAGS directly yields data required for remedial design."〔(Modified Active Gas Sampling Manual, Florida Department of Environmental Protection )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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