Tetra Tech Awarded Feasibility Study For Environmental Remediation Project At Cameco’s Port Hope Conversion Facility

Tetra Tech, Inc. (NASDAQ: TTEK) announced today that it has been awarded a contract to complete the feasibility study for a major remediation project in Port Hope, Ontario, Canada. The remediation effort is a cornerstone of the “Vision in Motion” project being conducted by Cameco Corporation, one of the world’s largest uranium producers. Following the satisfactory completion of the feasibility study, Cameco plans to enter into an engineering-procurement-construction management (EPCM) contract for the remediation and construction phase. The value of the feasibility study was not disclosed.

The Vision in Motion program involves the removal of old and under-utilized buildings, contaminated soil and stored wastes as well as the construction of new buildings at Cameco’s Port Hope Conversion Facility.

Dan Batrack, Tetra Tech’s Chairman and CEO, said, “We are pleased to have the opportunity to help Cameco clean up, modernize, and improve the appearance of the Port Hope Conversion Facility, in accordance with strict environmental standards and the desires of the local community and other stakeholders.”

Vision in Motion will require transferring approximately 150,000 cubic metres of material to a government-run long-term waste management facility. The feasibility study is scheduled to be completed in the fall of 2012, with EPCM implementation beginning in 2013.

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.

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