Tetra Tech Wins $52 Million Federal Aviation Administration Information Technology Operational Support Contract

Business Wire, Oct 8, 2007

PASADENA, Calif. -- Tetra Tech, Inc. (NASDAQ: TTEK) announced today that it has been awarded a contract to provide information technology operational support to the Federal Aviation Administration's (FAA) Office of Security and Hazardous Materials. Under this indefinite quantity contract, the FAA may order technical support services valued at up to $52 million over a five-year period.

Tetra Tech will provide information technology services including desktop, email, and application helpdesk support; local and wide area network support; web applications operational and engineering support; application development and maintenance support; security accreditation and certification support; HSPD-12 support; and other specialized program support for classified systems and computer forensics, among other services.

Tetra Tech's Advanced Management Technology, Inc. (AMTI) operating unit was awarded this contract.

About Tetra Tech (www.tetratech.com)

Tetra Tech is a leading provider of consulting, engineering, and technical services. With approximately 8,500 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.