The primary unresolved problems that above-ground retorting faces are stringent air quality regulations, management of solid wastes, and lack of data on the environmental, health, and safety impacts. Concerns of in-situ technologies are aquifer disruption/contamination, occupational health underground (modified in-situ), and lack of data on environmental, health, and safety impacts. Probabilities are computed that an adverse finding will be found, that the program will be delayed, and that energy costs will increase by 10%. (DLC)