Tetra Tech Selected for $18 Million Seattle Seawall Replacement Project

Tetra Tech, Inc. (NASDAQ: TTEK) announced today that it has been selected to provide program management and technical services for the Central Waterfront seawall replacement project for the Seattle Department of Transportation (SDOT). The SDOT estimates the value of this contract at approximately $18 million.

Built between 1916 and 1934, the seawall runs along Elliott Bay in downtown Seattle. Tetra Tech will assist SDOT in replacing the central portion from S. Washington Street to Pine Street (approximately 3,500 lineal feet), the construction of which is anticipated to cost $285 million. SDOT is seeking to replace the seawall with a long-term solution that meets seismic standards, improves habitat, and provides effective protection for the public, waterfront facilities, and economic activities.

"Tetra Tech has extensive experience with delivering multi-disciplinary design efforts, enhancing marine habitats, preparing environmental documentation, and providing permit support for large, complex projects involving land and water,” said SDOT in a statement released by the City of Seattle.

Tetra Tech will provide program management, planning, design, public outreach, and environmental and permitting services for the replacement of the Central Waterfront seawall.

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.