Tues.story?coll=la-headlines-
california+ctrack=1+cset=true

Oakland Tribune:
http://www. Any forward-looking
statements made in this release represent management's best judgment
as to what may occur in the future.

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Navy and Marine
Corps sites in 28 states, Puerto Rico, and the Bahamas Islands.

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(NASDAQ:TTEK) announced today that it was re-awarded a Comprehensive
Long-Term Environmental Action Navy (CLEAN) contract with a value of
up to $125 million.

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UC press release:
http://www.

Thurs.

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efc9.com/news/state/20060314 -9999-1n14chemical. The contract has a one-year base period and four one-year
options.S.

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NoHarm.-- --Tetra Tech, Inc.

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org/

Early press coverage of Wilson report:
LA Times:
http: //www.latimes.com/news/local/la-me-
chemicals14mar14,1,5931691. The
scope of the contract also will support the Navy's Munitions Response
Program (MRP), Range Sustainability Environmental Program Assessment
(RSEPA) program, base realignment and closure (BRAC) actions, and of
findings of suitability for transfer/early transfer/lease initiatives.tetratech.

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UC Report: California Must Regulate Toxic Chemicals and Promote Green Chemistry or Risk Lagging Behind in the Global Economy

edu/news/media/releases /2006/03/14_greenchemicals.pdf

Also this week:
Weds.org

Tetra Tech Wins U.S. Navy EFD SOUTH CLEAN Contract

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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3/14: UC report released to California Legislature. 3/16: California business leaders, scientists and legislators will
discuss efforts to green chemical supply chains and implement comprehensive
chemical policies at the state, national and international level.com/oaklandtribune /localnews/ci_3600714

San Diego Union Tribune:
http://www.
Tetra Tech will support the Department of Defense's Installation
Restoration Program (IRP) by providing remedial investigation;
remedial design; environmental documentation; chemical, biological,
and radiological response actions; and other related services.

Any statements made in this release that are not based on
historical fact are forward-looking statements.

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For more information, http://www. 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.

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in 277 CORY HALL. 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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The report is the first in the nation to
establish a state framework for shifting the economy toward "green chemistry"
-- the design and use of chemicals that are less toxic, do not accumulate in
the body and break down more readily in the environment.berkeley. "Green
Chemistry: Necessary Steps to a Sustainable Future," 3 p.signonsandiego.com

Tetra Tech is a leading provider of consulting, engineering and
technical services.

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shtml

Full report: http://coeh.m.

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BERKELEY, Calif.berkeley.

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Wilson , PhD, MPH, assistant research scientist, UC
Berkeley School of Public Health. With nearly 8,000 associates located in the United
States and internationally, the Company supports commercial and
government clients in the areas of resource management, infrastructure
and communications.

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"Green
Chemistry in California: A Framework for Leadership in Chemicals Policy and
Innovation," by California Policy Research Center, Office of the President,
UC; Author: Michael P. 3/15: John Warner, who started the world's first Green Chemistry
PhD program, will speak to faculty and students at UC Berkeley .html

Health Care Without Harm is an international coalition working to reduce
pollution in the health care industry and shift health-care markets toward
safer, non-toxic products.

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insidebayarea . Work will be performed primarily at U.

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edu/GreenChemistryReport. Chemical
Policy Symposium, Environmental Finance Center Region IX: http://www.

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Tetra Tech will provide program management and
technical environmental services to the Department of the Navy, Naval
Facilities Engineering Command, Engineering Field Division (EFD),
South.

About Tetra Tech (www.

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, California faces mounting
health and environmental problems due to chemical pollution, and the state
should take the lead in establishing a sustainable policy toward chemical
production and use -- or risk being left behind in the changing global
economy, according to a new report released today by researchers at the
University of California , Berkeley.

Military Writers/Business Editors

PASADENA, Calif.

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