Comparative Research On Health Risk Assessment Technology Of Csoil And RBCA

Traditonal management and remediation of the contaminants in soil or groundwater are mainly based on the environment standards. Practice in those developed countries shows that, it is usually unsuccessful to acheive the clean-up level based on environment standards. In order to solve this problem more rationalll, risk conception and health risk assessment are introduced into the traditional subsurface contaminant remediation, and several remediation modes based on health risk have been developed.Among many risk assessment modes, RBCA mode developed by ASTM and Csoil mode developed by RIVM are most successful and famous. In this research, we carried out a comparative research of these two modes. The research consists of three parts: model concept comparision, transportation model comparision and case studies.There are two main differences between these two modes: exposure pathway and equations for exposure rates'calculation. As the volatilization model is the core part of transportation model, the transportation model comparision is mainly about the volatilization models of RBCA and Csoil. The differences include: principle of distribution calculation over different phases, the assumption of outdoors contaminant distribution and the assumption of the transportation process. Comparative case studies of indoors volatilization and outdoors volatilization were carried out.Futher more, contamination cases of the surface soil contamination, subsurface contamination and groundwater contamination were considered to evaluate the risk. The results show that water-drinking exposure and volatilization exposure are the most important exposure pathways; meanwhile, leaching is a very important process in contaminant transportation.