Deep within the smoke-blackened ruins of an underground parking garage, 30 workers are installing tendonlike bundles of steel cable, called tiebacks, to anchor the concrete perimeter foundation wall to bedrock. This will permit the demolition in coming months of the last major structural vestige of the old World Trade Center..............
"We've already done the borings for the foundation," he said. "The tiebacks are going in now. Once the tiebacks are complete, the slabs will come down. And, of course, the footings will be going in as well, a number of footings that hold the whole, massive Freedom Tower.
Demolition of the garage will cost about $10 million. "It has to be done very meticulously," Mr. Seymour said. "That's why it's important to begin right away."......................
Another preliminary step to construction is the pouring of dozens of concrete footings on which the tower columns will stand. That should begin in the fall.
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