Langan Engineering & Environmental Services Inc

With more than 15 offices throughout the United States, Tetra Tech NUS provides environmental consulting and engineering, remediation, construction and information technology services to government and commercial clients. It offers air quality, regulatory compliance, environmental analysis, planning, hazardous waste management, nuclear plant licensing and risk assessment solutions. The company also specializes in the water and wastewater treatment services. Tetra Tech NUS is a subsidiary of Tetra Tech, which is one of the world s leading companies that provides consulting, engineering and technical services. Founded in 1996, the parent company maintains a staff of over 10,000 employees. It offers solutions for waterways, harbors and coastal areas. Tetra Tech operates various subsidiaries, including Tetra Tech FC, Tetra Tech International and Tetra Tech International.

Weston Solutions delivers integrated, sustainable solutions for environmental restoration, property redevelopment, design and build construction, green buildings and clean energy. The company has a staff of more than 1,800 people in over 60 offices worldwide. Weston Solutions serves commercial and industrial agencies and federal, state and local government. The company through its subsidiary, Weston Solutions India Private Limited provides integrated and sustainable approach for combine construction management and green development in planning, engineering and building Ecotourism Park in Hyderabad in India. It also offers assistance in the planning, design, and implementation of green solutions in a variety of ways. Weston Solutions is an employee-owned company that was founded in 1957.