Firms have until Sept. 2 to submit comments on a Labor Dept. proposal to require contractors and subcontractors to post notices informing their employees of their rights under the National Labor Relations Act, which includes the right to join a union. The proposed rule, published in the Aug. 3 Federal Register, was drafted to implement a Jan. 30 executive order by President Barack Obama. Violation of the rule could lead to contract suspension, termination or debarment. Nonunion construction groups say they have concerns with the proposal. Bob Hirsch, director of legal and regulatory affairs for Associated Builders and Contractors, says
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.