A Risk Assessment evaluates the data collected and provides the risk information necessary to assist in decision-making at remedial sites.  The risk assessment provides the information necessary to justify action (or no action) at a site and to select the best remedy for the site.  The risk assessment includes characterization of the contaminants, the potential exposures, and the potentially exposed populations to determine what risks need to be reduced or eliminated and what exposures need to be prevented.  A conceptual site model is used to evaluate the potential contaminant transport pathways and potential pathways by which humans could be exposed to site contamination.