Papers in this volume originated from two workshops entitled "Reserving and Treating Environmental Risks" and "Resource Recovery" as part of the IMA 1999-2000 General Program. These workshops brought together mathematicians, engineers and scientists to summarize recent theoretical, computational and experimental developments in the theory of phenomena in the porous media.

The first workshop focused on the mathematical problems that arise in the transfer of groundwater to pollution, and the proliferation, inventory and treatment of biological, chemical and radioactive wastes. In the second conference, the processes underlying oil recovery and the geological schedule of deformation, flow and interaction in porous media were discussed.

Simulation techniques were used to simulate complex domains with large-scale spatial resolution and types of physics. Probable job methods were discussed to determine the most probable case of under-surface and related uncertainties.

Practical examples included the penetration of chemical and radioactive waste dumps, incarceration by injection of porous materials and biocides of petroleum and other wastes. This volume will be devoted to underwater scientists who wish to see recent mathematical and experimental efforts to study sub-surface phenomena of resource recovery and treatment issues..