Risk assessment of contaminated sites intends to identify sources of dangers and, if possible, to quantify risks for objects of the public security that should be protected. The UMS system is an assistance device for the evaluation of human exposure to pollutants from hazardous waste sites. In addition to toxicological questions, the model considers the characteristics of pollution, site factors, and land use and tries to standardize the procedures and methods for the evaluation of a site-specific risk. With the UMS model, it is possible to describe the release and distribution of contaminants in soil and the intake, resorption, and effects in humans.

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