Tetra Tech, Inc. (NASDAQ: TTEK) announced today that it has been awarded a $20 million contract, with option years for an additional $3.5 million, with the Great Lakes Dredge & Dock Company, LLC to perform environmental management services and provide construction oversight as part of the Miami Harbor Construction Dredging Project. Tetra Tech’s scientists will provide environmental management and quality control oversight for the transplantation of seagrasses, relocation of corals, and monitoring of existing seagrass beds, coral reefs and sediment during dredging activities. Tetra Tech’s engineers will also subcontract and manage the construction of new artificial reefs and seagrass beds created from the dredged material. PortMiami is the first port in the southeastern United States to initiate dredging operations to expand its capacity to accommodate the larger shipping vessels anticipated from the expanded Panama Canal. 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.