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Organochlorines have been widely detected in the groundwater in Japan. In order to resolve the mechanism of groundwater pollution, migration and leaching of the undiluted organochlorines were examined in water and porous media. It proves that undiluted trichloroethylene(TCE) readily infiltrated in unsaturated zone due to the physical properties, greater in density and less in surface tension and viscosity than water. In saturated zone TCE migrated and remained stagnant as isolated in pore space of the media. These phenomena reappeared in the Hele-Shaw model. Leachate concentration of TCE due to the rainfall infiltration and groundwater flow amounts to several thousands times as much as the tentative standard for drinking water. Besides, a new monitoring method by analysing the gaseous contents in the surface soil has been developed and was applied to the field observation in the waste landfill site.

Infiltration and Leaching of Chlorinated Organic Compounds and Mechanism of Groundwater Contamination