U.S. Army Corps of Engineers Formerly Utilized Sites Remedial Action Program contractors receive training on the Multi-Agency Radiation Survey and Site Investigation Manual. The manual provides detailed guidance on how to demonstrate that a site is in compliance with a radiation dose- or risk-based regulation. MARSSIM focuses on the demonstration of compliance during the final status survey following scoping, characterization and any necessary remedial actions. MARSSIM was developed collaboratively by the Department of Defense, the Department of Energy, the United States Nuclear Regulatory Commission, and the Environmental Protection Agency.