Under this five-year contract Tetra Tech will provide engineering design, construction management, and environmental monitoring of civil works and treatment activities for dioxin-contaminated soil and sediment to reduce the risk of exposure to people on the Air Base as well as in the communities that border it, and to restore the land for full use. Tetra Tech scientists and engineers will support USAID in evaluating the design and optimizing the performance of treatment technologies to meet the project objectives. Climate risks also will be considered throughout the project to mitigate potential impacts due to changing climatic conditions.