ABSTRACT
As understanding of the mechanisms of contaminant transport through barrier systems improves, the design of containment systems is moving from a prescriptive approach to a performance design approach. It is expected that reliance on models for predictive-based design will increase in the future, as the need for predicting long-term barrier system performance increases. This chapter details the mechanisms and models for predicting the performance of components of passive barriers such as caps, permeable reactive barriers (PRBs), and walls and floors. The relevant regulatory drivers and current state of practice are summarized, and research needs are identified. Chapter 1 dealt with system performance modeling while this chapter focuses on the performance of components that constitute containment systems.
