Tetra Tech's Board Elects Al Smith Chairman

Dan Batrack, Tetra Tech's CEO, said, "This step completes themanagement transition that Tetra Tech announced in November. Themanagement team welcomes Al Smith as Tetra Tech's new Chairman, andwishes Dr. Hwang much happiness in his retirement."

Tetra Tech's Board of Directors now has six members and includesfour outside Directors.

About Tetra Tech (www.tetratech.com)

Tetra Tech is a leading provider of consulting, engineering andtechnical services. With over 7,500 associates located in the UnitedStates and internationally, the Company supports commercial andgovernment clients in the areas of resource management andinfrastructure. Tetra Tech's services include research anddevelopment, applied science and technology, engineering design,program management, construction management, and operations andmaintenance.

Any statements made in this release that are not based onhistorical fact are forward-looking statements. Any forward-lookingstatements made in this release represent management's best judgmentas to what may occur in the future. However, Tetra Tech's actualoutcome and results are not guaranteed and are subject to certainrisks, uncertainties and assumptions ("Future Factors"), and maydiffer materially from what is expressed. For a description of FutureFactors that could cause actual results to differ materially from suchforward-looking statements, see the discussion under the section "RiskFactors" included in the Company's Form 10-K and 10-Q filings with theSecurities and Exchange Commission.