Tetra Tech Awarded $216 Million Huntsville Center Munitions Clearance Task Order

PASADENA, Calif., Jan 26, 2006 (BUSINESS WIRE) -- Tetra Tech, Inc. (NASDAQ:TTEK) announced today that it was awarded a new $216 million task order by the U.S. Army Engineering and Support Center, Huntsville (Huntsville Center) under its worldwide Military Munitions Response Program. Tetra Tech will provide mobile teams to support munitions clearance in Iraq for up to 36 months. Tetra Tech recently received authorization to provide $15.2 million worth of munitions clearance services during its first two months of work under the task order. Tetra Tech's mobile teams will be assigned by the military to remove and dispose of unexploded ordnance--including unfired bombs, artillery shells, and ammunition--that has been deployed, dumped, or stockpiled in various locations across Iraq. The task order was awarded under Tetra Tech's Munitions Response Services and Other Munitions Related Services contract with the Huntsville Center, the U.S. Army Corps of Engineers' military munitions response program center of excellence. About Tetra Tech (www.tetratech.com) Tetra Tech is a leading provider of consulting, engineering and technical services. With over 7,500 associates located in the United States and internationally, the Company supports commercial and government clients in the areas of resource management and infrastructure. Tetra Tech's services include research and development, applied science and technology, engineering design, program management, construction management, and operations and maintenance. Any statements made in this release that are not based on historical fact are forward-looking statements. Any forward-looking statements made in this release represent management's best judgment as to what may occur in the future. However, Tetra Tech's actual outcome and results are not guaranteed and are subject to certain risks, uncertainties and assumptions ("Future Factors"), and may differ materially from what is expressed. For a description of Future Factors that could cause actual results to differ materially from such forward-looking statements, see the discussion under the section "Risk Factors" included in the Company's Form 10-K and 10-Q filings with the Securities and Exchange Commission. Tetra Tech, Inc. Mike Bieber, 626-351-4664

Source: Tetra Tech, Inc.
Date: Jan 26, 2006