In late 1985, the Environmental Engineering Committee of the Science Advisory Board was asked by the Office of Marine and Estuarine Protection (OMEP) to review technical documents supporting revisions to the Agency's ocean dumping regulations. The two main issues were: (1) technical justification for the different regulatory treatment of the disposal of dredged materials; and (2) the consideration, in the ocean disposal of publicly owned treatment works (POTW) sludges, of both the need for ocean dumping and the availability and impacts of land-based alternatives. The report deals with the second of these issues only. Specifically, the report presents the Science Advisory Board review of the methodologies developed by EPA's Office of Policy Planning and Evaluation (OPPE) to analyze POTW sludge landfilling and land application as alternatives to ocean disposal of POTW sludges.