A federal court has upheld the legality of President Barack Obama’s executive order requiring certain federal contractors and subcontractors to use the Dept. of Homeland Security’s E-Verify system to ensure their workers are legally authorized to work in the U.S. The rule implementing the order goes into effect on Sept. 8 and applies to employers holding federal prime contracts of $100,000 or more or subcontracts worth $3,000 or more. Several business groups, including the Associated Builders and Contractors and the U.S. Chamber of Commerce, had challenged the requirement, claiming broader use of the E-Verify program would expose contractors to potential
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.