There are still financial shadows on the Freedom Tower. Revised plans for the 9/11 memorial remain a mystery. But something else is hidden from public view, far below street level: work is accelerating in almost every corner of the World Trade Center site.New York Times
Two months ago, a dozen workers at most were there every day. The number is now approaching 100, according to the Port Authority of New York and New Jersey, which owns and controls the site. By the fifth anniversary of the attack, there will probably be 150. "Since April, we seem to have dramatically picked up the pace," said Anthony R. Coscia, the chairman of the authority, after an inspection tour yesterday. "The early-stage work is among the most complex and difficult. Once it picks up, the momentum moves pretty quickly."
Kenneth J. Ringler Jr., the executive director of the authority, said: "What's being done isn't visible from the street, but it's very necessary in moving this forward quietly. Even the blasting is quiet." (Two blasts on Monday and three on Wednesday to loosen bedrock under the Freedom Tower were scarcely audible outside the site.) A dense subterranean structure of footings, foundations, steel columns and concrete walls must be constructed to support the office towers, the memorial, the permanent PATH terminal, the plaza and the performing arts center.
By the autumn of 2007, the first new aboveground structure at ground zero in four years should be completed, on Vesey Street. This will be a passenger entrance pavilion, or headhouse. It will serve the temporary PATH terminal until the permanent transportation hub, designed by Santiago Calatrava, opens in 2009. On Monday, workers about 45 feet below Vesey Street were torching the hefty structural framework of a truck ramp that served the trade center. Its only recognizable trace was a splayed entry and exit apron that once connected to Barclay Street but now leads to thin air.
Along the west edge of the temporary PATH terminal, 70 feet below street level, a hoe ram — something like a giant jackhammer mounted on tank treads — was chopping up bedrock to prepare for the footings and foundations of a fourth passenger platform. On the other side of the No. 1 subway line, which bisects ground zero, a mobile excavator was grading the earth to prepare for a test of the pilings that will be used to support the subway tracks during the excavation and construction around them. The pilings will be made of tubular steel pipes like those used for drilling oil wells. Each piling is supposed to support 250 tons. But they are being tested with a 25-foot-tall stack of forged iron blocks and steel plates that weighs 400 tons.
Near the test pilings, a temporary storage, staging and training area has been set up in a two-block-long abandoned underground chamber that was once the passenger platform hall of the Hudson Terminal. This was built in 1909 by the Hudson & Manhattan Railroad, predecessor to PATH.
The Hudson Terminal was later used for truck loading docks under 4 and 5 World Trade Center. It will eventually be demolished to make way for the new PATH terminal.
Phoenix Constructors, a joint venture of Slattery Skanska, Bovis Lend Lease, Fluor Enterprises and Granite Construction, is building the temporary and permanent PATH terminal. Tishman Construction Corporation is building the Freedom Tower. On Tuesday, Mr. Coscia warned that the tower would have to be reconsidered if state officials failed to obtain leases for one million square feet from federal agencies by September. Yesterday, Frank J. Sciame, a construction executive charged with finding ways to build the memorial and memorial museum for $500 million, made his report in private to Gov. George E. Pataki and Mayor Michael R. Bloomberg. The recommendations are to be released next week. Current estimates for the memorial and memorial museum run from $630 million to $672 million, not including the overall costs of preparing the site, estimated at $150 million to $300 million. It seems increasingly clear that in order to meet the $500 million memorial budget, at least one of two key elements in the original design by Michael Arad may have to be eliminated: the waterfalls inside the two voids where the twin towers stood or the underground galleries that were to surround the pools at the bottom of the voids.
A far more certain prospect for construction is PATH's new Vesey Street headhouse, which will replace the concourse and canopy on Church Street that opened in 2003. In the reconfigured terminal, commuters will leave through the north end of the existing mezzanine and a new intermediate platform. "Iridescent Lighting," a 118-foot mosaic mural currently on the mezzanine, will be relocated there.
From the intermediate platform, eight escalators, two stairways and an elevator will rise 42 feet to the headhouse opposite the new park outside 7 World Trade Center. A Hudson News newsstand will occupy one corner of the entrance pavilion. Eventually, that site is to be occupied by a performing arts center designed by Frank Gehry. Officials are trying to coordinate the two projects, so that the underground part of the Vesey Street entrance does not interfere with the arts center foundations.
Schematic of the replacement entrance to the temporary terminal