"While the technical feasibility of UCG has been studied, the environmental impacts have not. The Hanna III test is designed to study two of these impacts: subsidence and effects on groundwater quality. The water quality analyses, both pre- and postburn, are described, as are the hydrological tests of both the seam and the one overlying aquifer. Results to date indicate that both the seam and aquifer possess both low and directional flow properties."