Tetra Tech Team Wins Global Multiple-Award Construction Contract with the U.S. Navy

Tetra Tech, Inc. (NASDAQ: TTEK) announced today that the dck/TtEC LLC was one of four contractors awarded a global multiple-award construction (GMAC) contract with the U.S. Navy. The indefinite delivery/indefinite quantity contract has a shared ceiling value of $900 million, with one base year and four option years. The dck/TtEC LLC combines Tetra Tech’s resources with those of dck worldwide, a global construction company.

The GMAC includes design-build and design-bid-build projects at U.S. Department of Defense installations worldwide. The work may include utilities, waterfront facilities, medical facilities, and energy and water conservation projects, among other projects. Some of the task orders may be used to execute projects under the American Recovery and Reinvestment Act of 2009.

About dck worldwide (www.dckworldwide.com)

dck worldwide is a global project delivery company specializing in developing, managing, and building highly complex projects. Created through the acquisition of assets and resources of the Dick Corporation and by attracting additional top industry talent, dck worldwide provides design-build, program management, construction management, and general construction services to corporations, developers, and government entities. dck worldwide operates in North America, Pacific Rim, Guam, Caribbean, and the Middle East.

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 more than 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.