The Occupational Safety and Health Administration has set an ambitious agenda for the next six months. Many of its top priorities, identified in the semi-annual agenda released on Dec. 20, involve the construction industry. While some sources say that OSHA has been revitalized under Assistant Secretary David Michaels, they wonder if the agency might be taking on more than it can accommodate. “OSHA has a lot on its plate,” says Aaron Trippler, director of government affairs for the American Industrial Hygiene Association. “We’re concerned that they may not have the resources to fully address all the issues, such as silica.”
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.