Construction is well underway at the World Trade Center site in Downtown Manhattan. 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:

Freedom Tower:

• Installation of tower-foundation steel columns (two cranes on site)
• Pouring of concrete for the foundation and rebar installation 

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 concrete slurry wall panels along Vesey and Church Streets (north of Cortlandt Street) through September 2007
• Slurry wall installation was completed in mid-May 2007 in the bathtub's south half; installation of tiebacks through 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.
• On August 8, 2007, approximately 580 metric tons (638 short tons) of jumbo steel I-beams to be used in the construction of the Memorial and Museum arrived at the Port of Savannah after a 4,771-mile journey from Arcelor Mill in Luxemborg. The steel will be discharged in Savannah and transported to Owen Steel Company's facilities in Columbia, South Carolina, where it will be fabricated to meet the specifications of the columns for the World Trade Center Memorial and Museum. During fabrication, Owen Steel will take the raw material from Arcelor and cut the material to the specified lengths. Secondary material will then be welded to the main members, necessary holes will be punched and drilled, and the individual pieces that comprise the skeleton of the building will be shipped to the World Trade Center site.
• Slurry wall reinforcement begins.
• 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 raised more 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.

Crews began resealing the building on October 1 and should be completed at the end of October. Sealed boxes of waste and debris are being trucked out regularly from the site as of mid-October.

The work to seal the building will continue up to the 19th floor. The floors above the 19th have already been abated.

Decontamination work will begin once the resealing process is complete. No revised deconstruction plan has been announced.

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.