Tetra Tech, Inc. (NASDAQ: TTEK) announced today that its Tetra Tech EC operating unit was awarded the $100 million U.S. Navy Unrestricted Remedial Action Contract (RAC) VI for environmental remediation services at various Department of Defense (DoD) installations in Alaska, Arizona, California, Colorado, Nevada, New Mexico, Oregon, Utah, Washington, and other installations within the Naval Facilities Engineering Command Atlantic area of responsibility. This is the fourth consecutive time that Tetra Tech EC has been selected for this contract. The single award, indefinite delivery/indefinite quantity contract is a cost-plus award fee contract with a one-year base period and four, one-year option periods. The RAC VI is expected to focus on environmental services to meet the U.S. Navy’s remedial action needs at active and closed bases. Tetra Tech EC will perform removal actions, expedited and emergency response actions, pilot and treatability studies, facilities operation and maintenance, and other related activities to support NAVFAC Southwest. 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 14,000 staff 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.