Geotechnical, Hydrogeologic, and Vegetation Data Package for 200-UW-1 Waste Site Engineered Surface Barrier Design.

Ward, A. L.

Technical Information Center Oak Ridge Tennessee

关键词: Radioactive waste management;    Engineered barriers;    Designs;    Assessments;    Performance;   

RP-ID  :  DE2007920205

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

Fluor Hanford (FH) is designing and assessing the performance of engineered barriers for final closure of U-plant waste sites. The ideal barrier will minimize recharge and plant intrusion into the underlying waste, thereby providing protection for human health and the environment. FH is using the Pacific Northwest National Laboratory (PNNL) Subsurface Transport over Multiple Phases (STOMP) simulator as the primary design optimization tool for simulating surface barrier performance. PNNL is supporting FH barrier design activities. One of PNNLs responsibilities is to provide parameter values for the geotechnical, physical, hydraulic, and thermal properties of the materials comprising the barrier and the structural fill on which it will be constructed as well as parameters to allow simulation of plant effects. This report provides the required data package as well as the technical basis, rationale, and methodology used to obtain the parameter values. Best-estimate values for the hydraulic parameters of the soil and geotechnical materials to be used in the performance assessment analyses of the candidate barriers were developed. Hydraulic properties were directly measured for the Environmental Restoration and Disposal Facility spoil pile soils and the silt loam borrow-source soils. Hydraulic properties for the admixture of silt loam and pea gravel and for the silt admixture and quarry spalls were estimated by adjusting the silt-loam parameters for amount of the coarse material. Geotextile hydraulic properties, which were compiled from data reported in the literature. However, properties of the biointrusion layer were derived from the specified particle-size distribution. A summary of Brooks-Corey and van Genuchten parameters along with saturated hydraulic conductivity are presented for each material. Thermal properties also play a critical role in the water and energy balance. These properties were estimated using pedotransfer functions that take into account the mineralogy and water-retention relationships for the porous materials. Predicted properties compared well with literature values, but were generally higher than those reported for Hanford sediments.