Abstract
Soil gas was collected and analyzed for tetrachloroethylene to examine the possibility of soil gas monitoring as a tool for identifying pollutant source and delineating plume boundary of pollution in specified groundwater. Field surveys in a shallow groundwater region show that tetrachloroethylene concentration in soil gas detected around pollutant source seems to be affected by gaseous diffusion from highly contaminated soil. With distance away from pollutant source, it is becoming in a possitive relationship to the tetrachloroethylene concentration in shallow groundwater. In particular, soil gas monitoring is recognized to be an effective technique for identifying pollutant source, as tetrachloroethylene concentration contours displayed around pollutant source are extending like concentric circles.
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