Purpose and Scope. This handbook provides technical guidance to USACE risk assessors and risk assessment support personnel for planning, evaluating, and conducting ecological risk assessments (ERAs) in a phased Hazardous, Toxic, and Radioactive Waste (HTRW) response action and Military Munitions Response Program (MMRP) projects with munitions constituents (MC). This handbook, a compendium to the Risk Assessment Handbook: Volume I – Human Health Evaluation (EM 200-1-4, USACE 1999), encourages the use of “good science” within the framework of existing U.S. Environmental Protection Agency ERA guidance.
