Tetra Tech Inc.

Mr. Batrack joined our predecessor in 1980 and was named Chairman in January 2008. Mr. Batrack was named Chief Executive Officer (CEO) and a director in November 2005. He also serves as Tetra Tech's President. Mr. Batrack has served us in numerous capacities over the last 28 years, including project scientist, project manager, operations manager, senior vice president, and president of an operating unit. He has managed complex solutions for many small and Fortune 500 customers, both in the United States and internationally. Mr. Batrack holds a B.A. degree in Business Administration from the University of Washington.

Mr. Christensen joined us in 1998 through the acquisition of our Tetra Tech NUS, Inc. operating unit and was named Vice President in November 2002. Mr. Christensen is responsible for the company’s information services and technologies, including the implementation of our enterprise resource planning system and management of the shared services organization. Previously, Mr. Christensen held positions at the NUS, Brown and Root Services, and Landmark Graphics subsidiaries of Halliburton Company, where his responsibilities included contracts administration, finance, and system development. Prior to his service at Halliburton, Mr. Christensen held positions at Burroughs Corporation and Apple Computer. Mr. Christensen holds B.A. and M.B.A. degrees from Brigham Young University.

Mr. Smith was named Senior Vice President and President of the Infrastructure Group on November 18, 2005. He has nearly 35 years of infrastructure industry experience focused on water infrastructure engineering. Mr. Smith joined us from MWH Global, Inc., where he was Senior Vice President of Strategic Planning. He spent the previous 24 years, from 1980 to 2004, at Black & Veatch, where he was promoted to President of the Europe Water Division. While at Black & Veatch, Mr. Smith focused on large program business development and acquisition integration. From 1976 to 1979, Mr. Smith was an adjunct professor Civil Engineering at the University of Colorado, Boulder, and director of Public Utilities for the City of Boulder. Mr. Smith holds a B.S. in Engineering from Kansas State University, an M.S. in Civil Engineering from the University of Colorado, and a J.D. from the University of Denver.

Mr. Walsh was named President of the Technical Environmental Services Group on December 1, 2005. He was named Senior Vice President in November 2002 and joined us in 1995 through the acquisition of our Tetra Tech EM Inc. (EMI) operating unit. Mr. Walsh joined EMI in 1987, and has served as information systems manager, office manager, and Vice President. He currently serves as the President of both EMI and our Tetra Tech NUS, Inc. operating unit. From 1985 to 1987, Mr. Walsh served as an environmental consultant to government agencies with Booz, Allen and Hamilton, Inc. Mr. Walsh has broad business development and contract management expertise with commercial clients and many government customers, including the U.S. Department of Defense, U.S. Environmental Protection Agency, U.S. Department of Energy, and numerous state and local agencies. He has published several articles for governmental research and professional associations. Mr. Walsh holds a B.S. degree in Environmental Resource Management and an M.P.A. in Public Administration from Pennsylvania State University.

Mr. Haun joined EMC in 1985 and has supported major federal clients including the U.S. Navy and other branches of the U.S. Department of Defense. He has managed groups that provide engineering and program management support in the areas of computer system design, analysis, and integration; systems engineering and logistics; modeling and simulation; and weapons test range support. Mr. Haun began his career as a field engineer and technical services manager in the petroleum industry. He holds a B.S. in Electrical Engineering. Mr. Haun was named Senior Vice President and President of the Systems Support and Security Group of Tetra Tech, Inc. in December 2005.

Mr. Lemmon joined our predecessor in 1981 in a technical capacity, and became a member of its corporate staff in a management position in 1985. In 1988, at the time of our predecessor's divestiture from Honeywell Inc., Mr. Lemmon structured and managed many of our corporate functions. In 1990, he was promoted to Director of Administration. Mr. Lemmon was elected a Vice President in November 1995. He serves as our Risk Manager and is also responsible for Human Resources and facilities.

Mr. Chu was named Senior Vice President and President of Technical Support Services (formerly Technical Environmental Services) in June 2007. He has more than 13 years of experience with us and has served in various technical and management capacities, including project and program manager, office manager, regional manager, and most recently, chief operating officer for the Technical Environmental Services Group. Mr. Chu was named a Vice President in 2001. He began his career as a civil/sanitary engineer in 1981 and entered the environmental consulting field in 1984. His career has included management of major assessment, engineering and remediation programs for the DoD, the EPA, state and local agencies, and commercial clients. Mr. Chu is a registered professional engineer in several states and has authored numerous technical articles. He holds a B.S. in Civil Engineering from Northeastern University and an M.S. in Environmental Engineering from the University of Southern California.

Dr. Brownlie was named Senior Vice President and President of the Environmental Engineering and Consulting Group on December 1, 2005. He joined our predecessor in 1981 and was named a Senior Vice President in December 1993. He has been a Vice President since 1988. For the past year, Dr. Brownlie managed one of our water consulting business units. Previously Dr. Brownlie managed various business units and programs focusing on water resources and environmental services, including work with the U.S. Army Corps of Engineers, the U.S. Air Force, the U.S. Department of the Interior's Bureau of Reclamation, and the U.S. Department of Energy. Dr. Brownlie is a registered Professional Engineer and has a strong technical background in water resources. He holds B.S. and M.S. degrees in Civil Engineering from the State University of New York at Buffalo and a Ph.D. in Civil Engineering from the California Institute of Technology.

Ms. Salin joined us in February 2002 and was named Vice President and General Counsel in November 2002. She was elected Secretary in November 2003. For the prior 17 years, Ms. Salin was a Principal with the law firm of Riordan & McKinzie (which was acquired by Bingham McCutchen LLP in July 2003), and served as Managing Principal of that firm from 1990 to 1992. She served as our outside counsel from the time of our formation in 1988. Ms. Salin holds B.A. and J.D. degrees from the University of California at Los Angeles.

Dr. Shoemaker joined us in 1991 and was named Vice President, Strategic Initiatives in August 2007. She is responsible for Tetra Tech's strategic planning, business development, and corporate communications functions. Dr. Shoemaker coordinates the corporate Initiatives Program, which supports companywide collaboration on key services in the company's major growth markets. She also leads the water resources modeling and systems development team and consults on the development of policy and programs for watershed management and sustainable communities. Dr. Shoemaker has more than 25 years of industry experience and has previously served in various technical and management capacities, including as project engineer, project manager, Vice President, and technical practice leader. Dr. Shoemaker holds a B.A. degree in Mathematics from Hamilton College and a Master of Engineering and Ph.D. in Agricultural Engineering from Cornell University and University of Maryland, respectively.

Mr. Bieber joined us in 1996, and was named Vice President, Business and Corporate Development in November 2005. He is responsible for business development, acquisitions, investor relations, and strategic planning. He was previously Vice President, Investor Relations and Corporate Development. From 1996 to 2000 he was a proposal manager in our corporate marketing group. From 1994 to 1996 he served as a strategic business development consultant to large defense, infrastructure and environmental firms at CRC, Inc. and its successor. Prior to that he worked for IT Corporation (now The Shaw Group, Inc.), where he served as project manager and engineer on government nuclear and petrochemical project. Mr. Bieber holds a B.S. degree in Civil Engineering from the Tennessee Technological University.

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Mr. Burdick was named Vice President and Corporate Controller in January 2004. He joined us in April 2003 as Vice President, Management Audit. Previously, Mr. Burdick served as the Executive Vice President and Chief Financial Officer for Aura Systems, Inc. From 2000 through 2002 he was the Chief Financial Officer for TRW Ventures. Prior to this, Mr. Burdick held the position of Senior Manager with Ernst & Young LLP in Los Angeles since 1986. Mr. Burdick holds a B.A. degree in Business Administration from Santa Clara University and is a Certified Public Accountant.

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Kellie DuBay is an environmental scientist with Tetra Tech, Inc. Ms. DuBay has supported the U.S. EPA in its efforts to promote watershed-based permitting and water quality trading, including the development of technical assistance tools such as the Watershed-Based Permitting NPDES Implementation Guidance and the toolkit entitled Implementing Water Quality Trading Through NPDES Permitting. She is currently supporting the Conservation Technology Information Center to develop a water quality trading technical assistance manual for the agricultural community through a cooperative agreement with U.S. EPA. Contact: Kellie DuBay 1468 West Ninth Street Suite 620 Cleveland, OH 44113 P: 216-861-2950 F: 216-861-2960 kellie.dubay@tetratech-ffx.com

Hernandez has taken leadership roles in several professional organizations such as the Society of Hispanic Professional Engineers (SHPE), the American Society of Civil Engineers (ASCE), and the local Engineers Week committee, affording her the opportunity to encourage students to pursue careers in engineering by mentoring, teaching, and giving presentations. She has just completed a two-year term as the president of the Central Florida Professional Chapter of SHPE. Her research has been published in peer reviewed technical journals and has been presented at three conferences. Hernandez is currently employed by Tetra Tech as a Water Resources Engineer. As project engineer, she was responsible for developing FEMA floodplain zones in the city of Deltona, Florida. There she contributed to the design and permitting of a $2 million emergency system that provides an outfall to 31 lakes and flooding relief to 57,000 residents in Deltona, in response to the 2002-2003 flooding emergency. She has also designed and permitted several other stormwater projects in Central Florida. Hernandez recently transferred to Tetra Tech's office in Chicago.

Toni recently completed her PhD in Environmental Sciences and Resources at Portland State University. For her dissertation research, Toni examined factors that influenced the photosynthetic rates and carbohydrate content of Egeria densa (Brazilian elodea), a highly invasive freshwater plant. Currently, she works as an Aquatic Biologist for Tetra Tech, Inc. in Portland, Oregon. Toni has been a member of OLA since arriving in Oregon in 2000. In addition to being Treasurer for OLA, she is a member of the North American Lake Management Society, the Western Aquatic Plant Management Society (Scholarship Chair), and the Aquatic Plant Management Society.

Mr. Thompson has been a member of our Board since April 30, 2007. Mr. Thompson is the President and Chief Executive Officer of Pacific Star Energy, LLC, a private energy investment firm. He is also Managing Director for the Alaska Venture Capital Group, LLC, a private oil and gas exploration firm. Mr. Thompson previously worked at ARCO (BP), where he served in various technical and management capacities, most recently as Executive Vice President for the Asia-Pacific Region. Mr. Thompson also serves on the boards of the Coeur d'Alene Mines Corporation and the Alaska Air Group.

Mr. Haden has been a member of our Board since December 1992. Mr. Haden has been a general partner of Riordan, Lewis & Haden, a Los Angeles-based partnership that invests in high-growth middle market companies, since 1987. Mr. Haden also serves as a director of IndyMac Bancorp, Inc., the holding company for IndyMac Bank, and as a director of IndyMac Bank. IndyMac Bank is a technology-based mortgage banker. In addition, Mr. Haden serves as a director of TCW Convertible Securities Fund, Inc., a diversified, closed-end management investment company, and TCW Galileo Mutual Funds, a registered investment company. Further, Mr. Haden serves as a director of several privately held companies.