Regulators reminded the Southern California city of Long Beach late last month that, just as private-sector busineses must comply with safety rules, public agencies must meet the same standards or face expensive consequences. On Jan. 26, California’s State Water Resources Control Board announced it had reached a $6.2-million settlement with the city for improperly storing petroleum and waste oil in underground tanks. The settlement was the first enforcement of its kind in California against a public agency, officials say, and could result in work worth millions of dollars for specialty contractors to install monitoring systems throughout the state. The State
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.