Tetra Tech, Inc. (NASDAQ: TTEK) announced today that it has been awarded a $17 million program for excavation and construction activities associated with the environmental remediation of dioxin contamination at Vietnam’s Da Nang Airport. Under contract with the U.S. Agency for International Development (USAID), Tetra Tech will support the first U.S.-funded remediation of contamination resulting from the use of chemical herbicides and defoliant during the Vietnam War. Tetra Tech will manage the construction of access roadways, build a thermal desorption pile containment structure, excavate and dewater dioxin-contaminated soils and sediments, place the soils and sediments into the pile containment structure for treatment by others, and restore the site. The USAID Da Nang Airport environmental remediation program is being conducted in coordination with the Government of Vietnam. 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.