Tetra Tech Wins $20 Million Volunteer Army Ammunition Plant Remediation Project

(PASADENA, Calif., Aug 30, 2006) -- Tetra Tech, Inc. (NASDAQ:TTEK) announced today that it has been awarded a $20 million fixed-price remediation with insurance (FPRI) project with the U.S. Army Corps of Engineers, Mobile District for the remediation of contaminated property at the former Volunteer Army Ammunition Plant (VOAAP) in Chattanooga, Tennessee. The project has a performance period of up to 10 years. VOAAP was historically used by the Army to manufacture TNT for World War II and subsequent conflicts. Tetra Tech will provide environmental consulting and engineering services throughout soil remediation and closure efforts at four environmental sites. The FPRI project at VOAAP will be conducted in concert with Tetra Tech's ongoing installation-wide groundwater corrective measures study. Tetra Tech has demonstrated expertise with innovative remedial technologies and approaches for compounds typically found at ammunition plants at other similar facilities, including current FPRI projects at Sunflower AAP and Iowa AAP. The VOAAP remediation project is part of a larger property revitalization/redevelopment effort by the City of Chattanooga and Hamilton County.

Source: Tetra Tech, Inc.
Date: Aug 30, 2006