Tetra Tech Wins $218 Million Contract Extension from Army

Date: November 14, 2007

Source: Tetra Tech

Tetra Tech Awarded $218 Million Contract Extension to Bring Rocky Mountain Arsenal Cleanup to Closure

Tetra Tech, Inc. (NASDAQ: TTEK) announced today that the U.S. Army has awarded the Company a five-year, $218 million contract extension to bring the Rocky Mountain Arsenal (RMA) to site closure and formally transition it to the U.S. Fish and Wildlife Service as the Rocky Mountain Arsenal National Wildlife Refuge. RMA is a 27-square-mile former chemical weapons facility 10 miles northeast of Denver, Colorado.

Tetra Tech has held the Program Management Contract for the $1.2 billion RMA remediation effort since 1997. Tetra Tech provides program management, hazardous waste landfill design, construction oversight, public involvement, regulatory support, and other technical and administrative support services for the cleanup.

Over the past 10 years the RMA cleanup program has received national recognition for its health and safety excellence and small business participation activities. The site achieved Star status under the Occupational Safety and Health Administration's (OSHA) Voluntary Protection Program for excellent health and safety performance—the first environmental cleanup site so recognized by OSHA.

The Rocky Mountain Arsenal National Wildlife Refuge will occupy more than 15,000 acres and will be one of the largest urban national wildlife refuges in the United States once cleanup is complete. The refuge is currently home to more than 330 species of animals, including wild bison, deer, coyotes, prairie dogs, bald eagles, and burrowing owls.

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.

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