General Services Administration veteran Anthony E. Costa has been tapped to be acting commissioner of the agency’s Public Buildings Service. A 20-year GSA employee, Costa on Dec. 27 replaced David Winstead, who had led PBS since 2005. Winstead has returned to private law practice. George Kreis, senior vice president of Tompkins Builders, Washington, D.C., says of Costa, “He’s always been very fair to deal with and has been great at cutting red tape.”
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.