Hda Technology

AECOM is an international professional technical services company providing consulting, design, program and construction management and operations and maintenance support to the transportation, environmental and building industries. The company serves both government and private clients. AECOM also provides technical support, international development assistance, and mining and power services. AECOM is headquartered in Los Angeles and operates additional offices throughout the United States., Canada, Asia, the Middle East, Africa, Australia and Europe.

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. The company had nearly 7,500 employees located in more than 250 offices throughout the world. Tetra Tech was founded in 1966 and is based in Pasadena, Calif.

Established in 1973, VA Consulting is an engineering firm specializing in the fields of land development, transportation, water resources, and land surveying. It provides planning, design, and construction services. Its staff includes registered civil engineers, traffic engineers, land surveyors, planners, designers and mapping technicians. The firm provides various land development services, such as entitlement processing, due diligence, infrastructure design and construction support. It provides tract maps, grading and drainage services. VA Consulting offers various water resources, such as water distribution and pump and sewer collection and treatment systems. It provides watershed management and flood routing services. The firm provides transportation and traffic engineering services. It has offices in Rancho Mirage, Corona and Irvine, Calif.