Apart from source excavation, the options available for the remediation of vadose zone metal and radionuclide contaminants beyond the practical excavation depth (0 to 15 m) are quite limited. Of the available technologies, very few are applicable to the deep vadose zone with the top-ranked candidate being soil desiccation. An expert panel review of the work on infiltration control and supplemental technologies identified a number of knowledge gaps that would need to be overcome before soil desiccation could be deployed. The report documents some of the research conducted in the last year to fill these knowledge gaps. This work included (1) performing intermediate-scale laboratory flow cell experiments to demonstrate the desiccation process, (2) implementing a scalable version of Subsurface Transport Over Multiple Phases--Water-Air-Energy (STOMP-WAE), and (3) performing numerical experiments to identify the factors controlling the performance of a desiccation system.
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