Groundwater Restoration at the Rocky Mountain 1 Underground Coal Gasification Site, Hanna, Wyoming. Topical Report, March 1988-December 1990.

摘要

Procedures were enacted after underground coal gasification (UCG) operations at the Rocky Mountain 1 test site to collect and contain UCG-affected groundwater in the gasification cavities. Two pump and treatment operations followed. Results from the first operation showed that the affected groundwater was successfully collected and contained within the gasification cavities. The water quality of the cavity waters was suprisingly good and improved during pumping. Some constituents that were expected to be elevated as a result of UCG operations were not increased above baseline concentrations. The treatment system was effective in reducing ammonia and dissolved organic concentrations and applying the treated water to the ground surface. Some parts of the treatment system were not needed because of the water quality of the cavity water. After groundwater was allowed to collect in the cavities for approximately one year, the groundwater was again pumped to the surface, treated, and applied to the surface. The water quality of the pumped groundwater was near baseline conditions. Restoration monitoring at the site shows that the groundwater quality is restored to near baseline water quality.