Photos Courtesy of Port of Long Beach History of oil extraction left behind benzene in aquifers and soil prone to subsidence. Related Links: Long Beach, Calif., Port Program Hits Stormy Waters Old Oil Field Hikes Price Tag for Long Beach Port Upgrades Unforeseen soil conditions surrounding foundations on a new $1.2- billion cable-stayed bridge have added as much as 18 months to the construction schedule, say officials at the Port of Long Beach, Calif."The soil has turned out to be more complicated than the engineers originally thought," says John Pope, port spokesman. The 1.2-mile-long Gerald Desmond Bridge is being constructed
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.