| This report was prepared under grant for EPA by Leslie Pearlman, a National Network of Environmental Management Studies (NNEMS) fellow. The document is intended to provide a basic summary and current status on subsurface barriers-vertical and horizontal-with an emphasis on the emerging and innovative vertical barrier technologies. It is not intended to be an inclusive report; it merely provides an overview of the existing work in the field on subsurface barrier technologies. The information was gathered from a range of available sources, including project documents, reports, periodicals, Internet searches, and personal communication with involved parties. |