Abstract
The air sparging coupled with the soil vapor extraction as the physical remediation technologies has been applied to a site contaminated with volatile substances like tetrachloroethylene. In order to implement these technologies, it is indispensable to understand the mechanism of air migration injected in groundwater and the change of groundwater concentration. In this paper, we presented the results of full scale field experiment implemented to estimate the change of groundwater concentration caused by long term air injection in groundwater. As a result, it was clarified that the change of groundwater concentration within the radius-ofinfluence was caused by volatilization into injected air and stirring of groundwater by air injection.
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