56 : Tetra Tech Inc.
Top 100 Revenue: $353,063,358
Defense revenue: $216,082,889
Civilian revenue: $136,980,469
2008 revenue: $2.1 billion
2008 earnings : $60.9 million
2007 revenue: $1.6 billion
2007 earnings: $46.4 million
Number of employees: 8,500
Headquarters: Pasadena, Calif.
Web address: http://www.tetratech.com
President/CEO: Dan L. Batrack, chairman, CEO and president
Ticker: TTEK
Lines of business: Water resources, watershed management, environmental management, information technology, groundwater services, mining services, geotechnical engineering, water and wastewater, land development services, buildings, transportation services, international development, remedial planning, carbon management, systems test and evaluation, regulatory consulting, disaster management, technical augmentation, construction, unexploded ordnance, wind energy, communications, environmental remediation, nuclear engineering and wetland restoration
Major customers: U.S. Agency for International Development, Energy Department, Environmental Protection Agency, Navy and Air Force
Major contracts/projects: Tetra Tech was one of five companies awarded the $500 million global architect-engineer infrastructure services contract with the U.S. Agency for International Development. The company is providing engineering studies and design services for USAID-funded infrastructure projects.
Previous Profile: 2008
Sources: Washington Technology, Eagle Eye Publishers Inc., and Houlihan Lokey

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