WTC Site Construction Update, December 2007Dec 07, 2007
Steady progress on the site’s signature elements of the Freedom Tower, the World Trade Center Memorial, and the new transportation hub has been ongoing since April of 2006. The following lists the major work taking place currently at the site:
- Installation of tower-foundation steel columns (two cranes on site)
- Pouring of concrete for the foundation and rebar installation for core footings
WTC East Bathtub:
The East Bathtub encompasses the Eastern portion of the site bounded by Greenwich Street to the West, Church Street to the East, Liberty Street to the South and Vesey Street to the north. This portion of the site must be excavated, have permanent slurry walls poured (the walls serve as concrete foundation reinforcements) and relocate various utilities before foundation work begins for WTC Towers 2, 3, and 4 in January of 2008.
- Installation of steel and concreteslurry wall panels along Vesey and Church Streets (north of Cortlandt Street)
- Slurry wall installation was completed in mid-May 2007 in the bathtub’s south half; installation oftiebacksthrough the wall began in late August 2007
- Major excavation of the south half of the east bathtub from late July 2007 through winter 2007
- Installation of mini-piles continues around the 1 train box, which runs through the WTC site along Greenwich Street
National September 11th Memorial and Museum:
- Foundation work began in March 2006 and is slated for completion by the end of 2007.The first phase of structural framework installation is underway.
- Concrete footings for the Memorial are being poured and are expected to be completed by December 2007.
- Slurry wall reinforcement began in October 2007.
- The first pieces of steel are expected to be erected in the north footprint in January 2008.
- Memorial crews plan to remove the ramp into the WTC site by April 2008 to continue construction on the south footprint.
- To date, the World Trade Center Memorial Foundation has raisedmore than$300 million towards its $350 million private fundraising goal.
WTC Transportation Hub:
- Construction of the new, long-term temporary PATH entrance on Vesey Street at West Broadway.
- Excavation and site preparation
- Removing and preserving original WTC structures as needed
- Removal of PATH station ceiling and installation of temporary steel structure beneath the 1 train box
- Long-lead procurements of elevator, escalator, and electrical equipment
- Construction of the West Street pedestrian underpass (the “east-west connector”), to link the WTC with Battery Park City’s World Financial Center; construction of the connector is ongoing within the WTC site
130 Liberty Street/Deutsche Bank Building Deconstruction:
A fire inside 130 Liberty Street on August 18, 2007 suspended deconstruction work. Federal, state, and city regulators including the FDNY have inspected the structure, which was damaged from floors 13 through 18. Department of Buildings (DOB) engineers have determined that building’s structure remains intact and there is no risk of collapse.
The fire standpipe in the building was repaired on September 5th, and additional fire safety improvements continue, including the restoration of the fire-safe stairway.
After several weeks, crews have resealed the building to the 19th floor (the floors above the 19th have already been abated). Sealed boxes of flammable waste and debris are being removed from the building through November 2007.
Decontamination work will resume likely by late 2007, once a subcontractor for the work has been secured. A revised deconstruction plan will likely be announced by the end of the year.
Air quality testing has been ongoing, with 12 sampling sites in the building’s immediate vicinity operational. Additional monitors are active throughout Lower Manhattan. Particulates readings are at normal levels, and Department of Environmental Protection personnel continue to test air quality at the site for several contaminants including asbestos. Air monitoring reports are available here; more information about air monitoring is available here, and on the Lower Manhattan Development Corporation’s website.
At the time of the fire, deconstruction of the former 40-story building was at the 26th floor. The search for potential human remains in the building concluded in early June 2007.