Cleanup project.

Tetra Tech Inc., a Pasadena-based consulting and engineering company, announced Wednesday it won a $20 million contract with the Army Corps of Engineers for the remediation of a contaminated site in Tennessee. Cleanup of the former Volunteer Army Ammunition Plant in Chattanooga will take up to 10 years. The plant was used by the Army to manufacture TNT beginning in World War II. The project will be conducted along with a groundwater study. Tetra Tech is conducting similar cleanup operations at two other ammunition plants.