The Occupational Safety and Health Administration has expanded the list of organizations whose crane-operator certification programs it formally recognizes, with an agreement with the National Center for Construction Education and Research, Gainesville, Fla. Related Links: Ten Minutes With OSHA Chief David Michaels OSHA chief David Michaels, assistant secretary of labor for occupational safety and health, and NCCER President Don Whyte signed the voluntary agreement on May 17 at the Dept. of Labor headquarters in Washington. In March, OSHA finalized a similar agreement with The Crane Institute of America Certification Inc. OSHA's first such crane-operator program agreement came in 1999, with
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.