Tetra Tech, Inc. (NASDAQ: TTEK) announced today that it has been awarded a $225 million contract to provide a broad spectrum of environmental restoration and remediation services for the U.S. Army Corps of Engineers (USACE), Louisville District. Five large business teams will share in the contract ceiling value. The new program has a two-year base period and two four-year options periods. Under the Environmental Restoration Services Contract (ERSC), Tetra Tech will provide a full range of environmental services including investigations, studies, design, remediation, environmental dredging, ecosystem restoration, operation and maintenance, and emergency and/or time-critical response activities. The ERSC covers environmental, hazardous waste, remediation, and munitions response programs at locations across the United States, but is expected to focus primarily within USACE’s Great Lakes Division and Ohio River Division boundaries. Tetra Tech has provided environmental services to the USACE Louisville District under an existing remediation contract for the past eight years. About Tetra Tech ( www.tetratech.com) Tetra Tech is a leading provider of consulting, engineering, program management, construction, 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.