Tetra Tech Awarded Worldwide Environmental Remediation Services Program

Tetra Tech, Inc. (NASDAQ:TTEK) announced today that it has been awarded a Worldwide Environmental Remediation Services (WERS) contract by the U.S. Army Engineering and Support Center, Huntsville (Huntsville Center). The contract is focused on munitions response and other hazardous, toxic, and radioactive waste (HTRW) remediation services. Tetra Tech is one of seven large businesses that were awarded this five-year indefinite-delivery/indefinite-quantity contract, which has a shared capacity of $965 million. Tetra Tech has held predecessor contracts for worldwide unexploded ordnance services since 2000.

The WERS contract includes response activities anywhere munitions are or have been stored, evaluated, treated, disposed of, or used for military training and operations.

"Unexploded ordnance cleanup is an important part of many remediation programs,” said Dan Batrack, Tetra Tech’s Chairman and CEO. "Tetra Tech is pleased to support the Huntsville Center as it seeks to return lands and waters to safe and productive use. These cleanup activities will help the U.S. Department of Defense achieve its Base Realignment and Closure (BRAC) goals and support the Military Munitions Response Program (MMRP) worldwide.”

About the U.S. Army Engineering and Support Center, Huntsville (www.hnd.usace.army.mil)

The scope of the Huntsville Center's mission includes a wide range of programs found nowhere else in the U.S. Army Corps of Engineers (USACE). Major programs include chemical demilitarization, environmental and munitions support, installation support, medical facilities, and ordnance and explosives. Unlike the USACE's traditional organizations, the Huntsville Center is not tied to geographic boundaries.

About Tetra Tech (www.tetratech.com)

Tetra Tech is a leading provider of consulting, engineering, program management, construction, and technical services addressing the resource management and infrastructure markets. The Company supports government and commercial clients by providing innovative solutions focused on water, the environment, and energy. With approximately 10,000 employees worldwide, Tetra Tech’s capabilities span the entire project life cycle.

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.