A series of relationships have been developed for estimating unit costs for decontamination and dismantlement (D&D] of a number of structure types. These relationships may be applied in the absence of other data to obtain rough order-of-magnitude cost estimates for DCD activities. The relationships were developed using DCD costs estimated for various types of buildings at the U S . Department of Energy Femald site. These unit costs take into account the level of radiological contamination as well as the building size and t g e .
BACKGROUNDHistorically, a variety of methods have been applied to determine the cost of D&D, ranging from a "bottom-up" approach that relies on detailed structure-specific information (such as the type of construction, level and type of contamination, structure size, and material quantities) to estimation of D&D costs as a percentage of the original capital cost of the structure. The technique used for preparing D&D cost estimates will vary with (1) the project's degree of definition; (2) the availability of databases containing information about the dimensions of a given structure (e.g., height, width,