SEMA Construction is a full-service construction firm that serves clients throughout the states of Colorado and California. The company offers general contracting and design and build services for various commercial and industrial facilities. It develops a range of highways, roads, bridges, dams, reservoirs, airports and underground utilities. SEMA Construction also provides a variety of land development services, including value engineering and general site grading. The company also offers restoration, enhancement and protection services for environmental containment, industrial treatment, and waste disposal and quality facilities. Its railroad services include track construction, maintenance and rehabilitation, as well as excavation and drainage. SEMA Construction is headquartered in Centennial, Colo.