Results of the Engineering Special Studies for the UMTRA Project—FY90

by Barbara Bridgeman, Jacobs Engineering Group, Albuquerque, United States,
Raymond H. Bennett, Jacobs Engineering Group, Albuquerque, United States,
John M. McBee, Jacobs Engineering Group, Albuquerque, United States,
Gregory M. Smith, Jacobs Engineering Group, Albuquerque, United States,



Document Type: Proceeding Paper

Part of: Environmental Engineering

Abstract: The proposed U.S. Environmental Protection Agency (EPA) groundwater standards (40 CFR 192) require that Uranium Mill Tailings Remedial Action (UMTRA) Project remedial action designs meet specific numerical limits for groundwater quality at a downgradient point of compliance. To meet the standards, a layer of fine-grained soil is included in the covers placed over UMTRA Project embankments. The soil layer limits infiltration into the disposal cell, reducing the resultant seepage from the cell base to the extent necessary to comply with the proposed EPA groundwater standards, and limits the emission of radon gas. This paper summarizes four studies of issues associated with the performance of the fine-grained soil layer (radon/infiltration barrier.

Subject Headings: Groundwater quality | Fine-grained soils | Soil water | Water resources | Layered soils | Water supply | Environmental Protection Agency

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