Langan Engineering & Environmental Services, Inc

Tetra Tech is one of the leading providers of specialized management consulting and technical services. The company focuses on the areas of resource management, infrastructure, and communications. Tetra Tech was founded to provide engineering services related to waterways, harbors and coastal areas. The company has since increased the size and scope of its business and expanded its service offerings through a series of strategic acquisitions and internal growth. Tetra Tech provides environmental services, water and wastewater management, infrastructure services, security design and outsourced technical services.

Established in 1951, URS Corporation offers a range of professional planning, engineering and architectural design, environmental, construction, and program and construction management services. It also offers system integration, operations and maintenance, management and specialized technical services. With over 50,000 employees, URS Corporation maintains a global presence. It provides services to the transportation, power, industrial infrastructure and process, environmental, nuclear management, wastewater, mining, and defense and security industries. URS Corporation has the URS, EG&G and Washington divisions. The URS Division provides planning, design, and program and construction management services for all types of transportation and water resources infrastructure, as well as for health care complexes, schools, courthouses and other public buildings. The EG&G Division primarily serves government clients, including the departments of Defense and Homeland Security. Headquartered in San Francisco, URS Corporation maintains a presence in Seattle.

PB, previously known as Parsons Brinckerhoff, provides strategic consulting, planning, engineering, and program and construction management services to public and private sector clients. It serves transportation, power, buildings and facilities, water and wastewater treatment, environmental, and urban and community development sectors. The company offers environmental impact assessments, geographic information systems, site remediation, solid waste management and institutional advisory services. PB also offers financial advisory, risk management, cost estimates, design project management, budget evaluations, quality assurance, design visualization and planning services. Its projects include Delhi Mass Rapid Transit System, SEREBAR Groundwater Treatment System, Los Angeles Unified School District and Detroit Recreation Department. PB has been operational for more than 120 years and maintains a location in Chicago.