Diaz Yourman & Associates

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.

Partner Assessment Corp. does business as Partner Engineering and Science Inc. Partner Engineering and Science Inc. delivers due diligence services across 14 regional offices in the United States, as well as in Mexico and Canada. The company offers an array of services, such as phase I environmental site assessments, probabal maximum loss, remedial services and much more. It performs property condition and building assessments for lenders and real estate investors. Partner Engineering and Science Inc. is a member of the National Association of Government Guaranteed Lenders (NAGGL), National Association of Development Companies (NADCO), National Association of Premier Lenders (NAPL) and other Small Business Administration (SBA) lending associations on both national and regional levels.

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.