[en] This engineering study provides a single phase concept of the underground layout for a Nuclear Waste Repository in Basalt. The study basis is provided by the functional criteria and integrated design criteria contained in Appendix E. The formulation of these criteria was generally based on the DOE Draft Generic Requirements Document, Rock Mechanics Data Package, Horizon Identification Report, and the Draft Waste Package Concepts Study. Generally, this study concluded that a rectangular single level layout with a central shaft pillar (there are two outlying shafts) is the best conceptual configuration based on the above criteria. 28 figs., 26 tabs