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Tetra Tech Inc., together with its subsidiaries, provides consulting, engineering, program management, construction management, and technical services for water, environment, energy, infrastructure, and natural resources sectors. The company operates in four segments: Engineering and Consulting Services (ECS), Technical Support Services (TSS), Engineering and Architecture Services (EAS), and Remediation and Construction Management (RCM). The ECS segment provides front-end science, consulting engineering, and project management services in the areas of surface water management, solid waste management, mining, geotechnical sciences, arctic engineering, industrial processes, oil sands, and information technology. The TSS segment offers management consulting and strategic direction in the areas of environmental assessments/hazardous waste management, climate change, international development, international reconstruction and stabilization, energy, oil and gas, and technical government consulting services. The EAS segment provides engineering and architecture design services, including leadership in energy and environmental design (LEED) and sustainability services, together with technical and program administration services for projects related to water infrastructure, transportation, and buildings and facilities. The RCM segment offers construction and construction management services in the areas of environmental remediation, infrastructure development, energy, and oil and gas. The company offers its services to the U.S. federal, state, and local government agencies, as well as to commercial and international clients. Tetra Tech, Inc. was founded in 1966 and is headquartered in Pasadena, California.