The final closure of mixed waste, e.g. hazardous and low•level nuclear, landfills is not currently possible in the U.S.A because performance sta11dards have not been established by the United States Environmental Protection Agency. Interim geomembraoe (GM) covers descnl>ed in this paper were designed to allow performance confirmation and to resist exposure conditions du1 ing a 1ni11imt1m 30 year service life. Six com1non GMs are evaluated related to their ab· · to survive interim cover service and design criteria.
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