Associated Builders and Contractors has issued a letter to the federal Occupational Safety and Health Administration seeking to delay Nov. 8 implementation of landmark crane-safety rules. In the letter, ABC “formally requests that the effective date of the work practice provisions contained in the rule be changed to 90 days from the availability of a reasonable set of compliance resources, rather than 90 days from publication of the final rule.” The letter is signed by Craig Shaffer, president of SafetyWorks Inc., Dillsburg, Pa., and chairman of ABC’s health and safety committee. The trade group, based in Arlington, Va., contends that
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.