The department said that "independent engineering analyses have confirmed that the aqueduct is not in danger of collapse".
The agency's self-imposed goal is to complete such investigations, called engineering analyses, in 12 months.
Mars is rising over NASA's horizon even as engineering analyses and soul-searching continue over the loss of the space shuttle Columbia and its seven astronauts.
In describing his new job, the authority said Mr. Siano "will focus on engineering analyses required to advance" the trade center and other projects.
A review of agency records shows that six of the 15 engineering analyses begun in 2011 are still under way.
The report said a review of 20 engineering analyses found 40 percent missed the deadline by an average of six months.
No one knows the ultimate costs, but our best engineering analyses indicate that, with some luck, fusion can indeed be cost- competitive.
In a review by Wheels of 26 engineering analyses by the agency over roughly the last two years, 18 were found to have resulted in recalls.
Operators of most of the nation's 103 commercial nuclear reactors have raised output, usually by making small changes to pumps and valves and performing engineering analyses to show that they can safely produce more heat — akin to raising a highway speed limit.
Simple engineering analyses that estimate bone strength may yield overly optimistic results, a new study suggests.
It lends itself naturally to traditional engineering analyses.
