The number of reported cases of tainted drywall from China continues to expand. The Consumer Product Safety Commission reports that, since July, defective Chinese drywall has been identified in two additional states, Pennsylvania and South Carolina, and that an additional 202 reports have been filed, bringing the total number of reported cases to 810. In a status update sent to Congress on Aug. 11, CPSC said a total of 23 states and the District of Columbia have reported cases of tainted drywall, although the majority of reports continue to come from Florida, Louisiana and Virginia. CPSC says it has received
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.