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Press release from Business Wire

Tetra Tech Earns ACEC's Top Honor for Engineering Excellence

Wednesday, May 02, 2012

Tetra Tech Earns ACEC's Top Honor for Engineering Excellence16:41 EDT Wednesday, May 02, 2012 PASADENA, Calif. (Business Wire) -- Tetra Tech, Inc. (NASDAQ: TTEK) announced today that it was awarded the American Council of Engineering Companies (ACEC) Grand Conceptor Award for its contributions to the Inner Harbor Navigation Canal (IHNC) Lake Borgne Surge Barrier in New Orleans, Louisiana. This U.S. Army Corps of Engineers project was recognized as the year's most outstanding engineering achievement during the 46th Annual Engineering Excellence Awards—a juried national competition sponsored by ACEC. “Built to withstand a once in a 100-year storm surge event, the new surge barrier effectively moves the first line of storm-surge defense more than 12 miles away from downtown New Orleans, and is now a model for floodgate and floodwall design worldwide,” ACEC remarked in a written statement. The 10,000-foot-long Lake Borgne Surge Barrier features three gates that allow vessels passage through channels in the barrier wall. Tetra Tech provided design project management services, developed preliminary and detailed designs of an innovative 150-foot-wide buoyant sector gate at the Gulf Intracoastal Waterway, and designed the structural monoliths and foundations of a 56-foot-wide vertical lift gate with vehicular bridge at Bayou Bienvenue. Tetra Tech performed its work as part of a joint venture with Ben C. Gerwick, Inc; the IHNC was constructed by Shaw Environmental & Infrastructure, Inc. About Tetra Tech (www.tetratech.com) Tetra Tech is a leading provider of consulting, engineering, program management, construction management, and technical services. The Company supports government and commercial clients by providing innovative solutions to complex problems focused on water, environment, energy, infrastructure, and natural resources. With more than 13,000 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. Tetra Tech, Inc.Jim Wu, Investor RelationsTalia Starkey, Media & Public Relations(626) 470-2844