[en] This report constitutes the third phase of the review of reports prepared by Sandia for the USNRC; the first two phases were reported in Volumes 1 and 2 of NUREG/CR-1672. The reviewers generally agree that the compartment model used in Volume 1 to describe environmental transport is capable of accurately calculating the phenomena if suitable data is available. The sensitivity analysis of the environmental transport model as presented in Volume 2, was judged to be inferior to Volume 1. The reasons for selecting certain input variables for the sensitivity analysis are not clear. The input data and associated uncertainty ranges appear not to have been selected from real geophysical sources. The significance of results is not clear. Tabular and graphical results are not discussed. In Volume 3, the compartment model is used to derive the asymptotic values of Cm²⁴⁵ concentration in sub-zones of ground water, soil, surface water and sediment. Methodology is not discussed; nor how the study can be used in an overall risk assessment of a waste repository