As the Superfund program approaches its 30th anniversary, it is at a crossroads. To finish cleaning up nearly 1,300 designated hazardous waste sites—some dangerous to human health—sources say the program needs funding. But with a difficult economy and little congressional support for reinstating a dedicated trust fund, those resources could be hard to come by. The result is a slowing of the already lethargic pace of site completions. + Image Photo: courtesy of North Wind Inc. The trust fund legislation sunset in 1995 and ran out of money in 2000. Source: GAO Meanwhile, some industry firms have developed solutions of
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.