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  #201  
Old Posted Jan 2, 2010, 2:05 PM
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http://lowermanhattan.info/news/3_qu...tin_78870.aspx

3 Questions for Quentin Brathwaite, Port Authority


Port Authority's assistant director of WTC Construction, Quentin Brathwaite

December 24, 2009


It’s been a year of tremendous progress at the World Trade Center (WTC), where for the first time in eight years one can plainly see structures filling out the site, like an early glimpse of the future.

As owner of the WTC, the Port Authority is responsible for the massive physical development taking place across the site’s 16 acres. The bi-state agency is now at work building what will be the city’s tallest tower, 1 World Trade Center, and the two largest man-made waterfalls in the world, the National 9/11 Memorial’s reflecting pools. As those two enormous projects continue, the Port continues to excavate for and construct the future WTC Transportation Hub, as well as the new South Bathtub, where the Vehicular Security Center entry will be built.

At the center of it all is Quentin Brathwaite, the Port Authority’s assistant director of WTC Construction. Just as the complexities of WTC site redevelopment are unparalleled, so are Mr. Brathwaite’s job duties, which include vast engineering and logistical planning, coordination between the various stakeholders and construction managers, and the responsibility of constant community outreach and responsiveness. In fact, the duties of the latter alone prompted the Port to create and entirely new division within the WTC Department, the Office of Program Logistics, headed by Mr. Brathwaite.


We asked Mr. Brathwaite three questions about the progress his team’s made at the site, and how it’s finding new ways to meet WTC construction demands.

The Port Authority is operating several giant cranes inside the WTC site, with one “mega crane” in place -- how does its size benefit construction progress?

Mr. Brathwaite: The largest crane that will be used during the reconstruction of the World Trade Center -- a Manitowoc 18,000 -- is already on site at the western edge of 1 WTC. With an 800-ton capacity and a boom longer than 400 feet, assembly of the 18,000 requires nearly a full week.

It was used to place some of the jumbo steel columns that frame 1 WTC’s perimeter and first three floors of the building. Each individual column is 60 feet long and weighs 70 tons. (To put that in perspective, every 12 inches of steel equals the weight a Honda Civic.) Currently all 24 jumbo perimeter columns have been installed and are clearly visible to passers by. In fact, additional steel has been installed above the columns and structural steel currently tops out over what will be 1 WTC’s fifth floor.

The Port Authority’s contractor responsible for installing WTC Transportation Hub steel will reposition the 18,000 in the East Bathtub in the first quarter of 2010. Cranes of this size are absolutely essential for placing the massive steel members that comprise the structure of 1 WTC and the Transportation Hub. Just as the 18,000 was crucial to placing 1 WTC’s huge perimeter columns, it is needed to install the largest and most complicated steel members required to realize the iconic design of the Hub.

The Port Authority is working closely with its contractor to ensure the crane obtains the necessary approvals and is repositioned on the site in a manner that minimizes impacts on surrounding traffic and the community.
While the coordination and planning required to bring immense cranes such as the 18,000 onto the site is considerable, they are essential to completing the WTC redevelopment. Moreover, their presence serves as very tangible evidence of the progress we continue to make in the reconstruction effort.

How will the Port Authority coordinate the utility and other infrastructure work for the reconstructed Greenwich Street, Fulton Street, and Cortlandt Way?

One of the great challenges in rebuilding the WTC stems from the fact that an unprecedented amount of construction is occurring within a single 16-acre site located in the heart of one of the densest, most active neighborhoods in New York City. With so many projects advancing simultaneously, careful coordination and logistics planning is essential for all construction activity on the site.

Key elements of the WTC rebuilding program are two newly constructed city streets -- Greenwich and Fulton -- and two newly constructed pedestrian ways -- Cortlandt and Dey. Each of these critical public infrastructure projects involves a unique set of challenges. Greenwich Street, for instance, is being constructed on top of the MTA’s active No. 1 subway line, which carries thousands of commuters a day through the middle of the WTC site.

So a key first step in constructing Greenwich Street is underpinning the No. 1 subway line and then excavating soil underneath the box while simultaneously constructing the underlying WTC infrastructure. Only with the underpinning complete can the construction of Greenwich Street proceed. The construction of the street, including utility placement, proceeds in phases, so portions are constructed and then used as staging areas as other portions progress. The sequencing of this “hop scotching” is carefully managed to ensure efficient completion of the work and is compatible with staging and access needs of adjacent projects on the site, such as the Memorial plaza.
Similarly, Fulton Street is built on top of the WTC Transportation Hub’s East-West Connector -- a retail-lined passageway extending through the site that forms a seamless below-grade circulation system linking the World Financial Center (WFC) and Battery Park City to the WTC complex. Not only does the Fulton Street construction depend on substantial completion of this corridor, it also is used for staging and access for other projects including 1 WTC and the Transportation Hub. As with Greenwich Street, the utility work is carefully planned and sequenced to permit access to adjacent projects while continuing to meet completion milestones.

As the above descriptions make clear, advancing the WTC Street utility and infrastructure work depends on the progress of other projects, and then entails significant coordination challenges. To meet those challenges, the Port Authority coordinates activities at several levels of increasing detail. First, individual project teams and contactors meet weekly to review staging plans and coordinate activities. When these meetings uncover potential conflicts, Port Authority project managers and contractors convene working sessions to find solutions that ensure work advances as quickly and safely as possible. There is also constant communication in the field to ensure construction continues to advance. By thinking about projects at various levels of detail and meeting continually, the Port Authority ensures that all projects on site maintain momentum.

What areas of construction have made faster-than-expected progress and why?

With the WTC assessment report, the Port Authority established aggressive but realistic schedules and budgets for each of its projects on the site. Through that assessment process we identified two opportunities to deliver projects earlier than anticipated. First, we re-sequenced the construction of the Transportation Hub’s below-grade mezzanine, building the roof first in a “deckover” approach. The Memorial plaza actually sits on top of this mezzanine roof structure, and building it first allows us to accelerate Memorial plaza construction so it can open for the 10-year anniversary of September 11th.

Second, we developed an innovative engineering solution to underpin the MTA’s No. 1 subway line, which bisects the WTC site. This approach calls for bracing the concrete subway tunnel -- commonly referred to as the “1 Box” -- and then excavating more than 100,000 cubic yards of dirt under the tunnel. As excavation advances, below-grade program space is constructed, an approach known as “top-down” construction. At the same time, work can begin on constructing the reinstated Greenwich Street on top of the 1 Box. As a result, this key piece of public infrastructure will be delivered much earlier than first anticipated.

In just slightly more than a year since the assessment, two other projects have made dramatic progress. In January 2009, we removed the Acrow Bridge ramp that spanned from street level down to the bedrock where the original twin towers were constructed, some 80 feet below grade. In the 11 months since then, more than 92 percent of Memorial structural steel has been installed and enough concrete poured that large portions of the plaza deck and the outlines of the reflecting pools are clearly visible. In fact, due to the level of progress made, family members of 9/11 victims were able to walk out onto the Memorial plaza for the first time during the September 2009 commemorative events. Memorial steel installation is slated to be nearly complete by the end of 2009.

The Port Authority has also developed a plan to accelerate construction of the Route 9A Pedestrian Underpass, a climate-controlled pedestrian corridor beneath the West Side Highway, which will serve the anticipated 100,000 people per day traveling between the WFC and the Transportation Hub. Under the previous plan, WFC master leaseholder Brookfield Properties was committed to design and construct a pavilion at the western terminus of the pedestrian underpass. Pavilion construction would have started only after completion of the underpass since limited staging area and access points permit only a single contractor to work in the area at any given time.

Working closely with Brookfield, the Port Authority developed a different approach where Brookfield performs a portion of the underpass work using the same contractor performing the pavilion construction. As a result, the building effort will be more efficient, saving a year on the combined schedule.
Accelerating the opening of a permanent mid-block connection between the transit system and Battery Park City will significantly reduce travel times and improve the pedestrian experience for commuters, residents, and visitors -- one of the Port Authority’s overarching goals during the World Trade Center rebuilding.
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  #202  
Old Posted Jan 14, 2010, 5:05 AM
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  #203  
Old Posted Jan 15, 2010, 2:07 AM
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  #204  
Old Posted Jan 15, 2010, 8:33 AM
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Transit center developments...
http://www.lowermanhattan.info/const...ion_34922.aspx

*The following information was last updated on January 8, 2010.


-Excavation and site preparation in east bathtub. Constrolled blasting for excavation will take place from January 11 through March 2010.

-Excavation and bracing at the concourse under West Street.

-Excavating beneath and installing steel below the 1 subway box

-Long-lead procurements of elevator, escalator, and electrical equipment

-Future restored Fulton Street substructure and decking is underway inside WTC site, including concrete pours

-Construction of the West Street pedestrian underpass (the "east-west connector") -- to link the WTC with Battery Park City's World Financial Center -- is active on the west side of the WTC site just south of the Freedom Tower and across West Street. Installation of 47 pre-cast arches ended in August 2008; roof structure now being installed.

-East-west connector structural components are being installed across West Street

-Headhouse construction is active outside the WFC's Winter Garden with coordination with Brookfield Properties
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  #205  
Old Posted Jan 22, 2010, 7:07 AM
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  #206  
Old Posted Jan 22, 2010, 9:48 PM
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http://www.kansascity.com/934/gallery/1700925.html



Ribbons of water flow off a mock-up waterfall designed for the National September 11 Memorial & Museum, Friday, Jan. 22, 2010, at the Brooklyn Navy Yard in New York. The 30-foot waterfall will cascade down the sides of the footprints of the destroyed World Trade Center towers, forming reflecting pools surrounded by the terrorist attack victims' names. (AP Photo/Mark Lennihan)



Architect Michael Arad visits a mock-up waterfall he designed for World Trade Center Memorial,



A commercial jet flies above a mock-up waterfall designed for the National September 11 Memorial & Museum







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  #207  
Old Posted Jan 24, 2010, 5:37 AM
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I watch this waterfall corner on French TV yesterday, ribbons of water flow are like all memorial's rendering, good work .
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  #208  
Old Posted Jan 27, 2010, 5:20 PM
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I was looking at some documents regarding changes that needed to be made to calatrava's path terminal. Among the many changes and modifications made was the clipping of one of the massive wings. The wing on the tower 3 side was trimmed down, im guessing because of the tight squeeze between tower 2 and 3. Not sure think this could be old news, but its a little dissapointing that they had to mess with the design. i quess thats what happens during a transformation from vision to reality. It will still be a beauty though!
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  #209  
Old Posted Jan 30, 2010, 2:00 PM
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JANUARY 29, 2010










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  #210  
Old Posted Jan 31, 2010, 10:39 PM
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Looks like the concrete in the memorial plaza is at or near grade with regards to the "brim" of the waterfalls. If that is the case how can they expect to plant white oaks and other large trees... oaks have tap roots that are often at least 50% of their height if not more. I am guessing tree selection has either shifted or I am not seeing evidence of how they engineered to accomidate this.
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  #211  
Old Posted Jan 31, 2010, 10:43 PM
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Hauntingly beautiful. I don't know if the intention was to...... or not. You know what I mean.
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  #212  
Old Posted Feb 4, 2010, 2:37 PM
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http://www.wnyc.org/news/articles/149515

Contract Approved for Central Element of 9/11 Memorial


Renderings of the memorial railings (courtesy of the National September 11th Memorial and Museum Foundation)

by Matthew Schuerman
February 03, 2010

A central element of the September 11 Memorial at Ground Zero moved forward today. The Port Authority approved an $11.7 million contract for the parapets and bronze railings that will surround both waterfalls at the memorial.

Port Authority Executive Director Chris Ward says the railing should be finished, along with most of the memorial, by the 10th anniversary of the attacks next year.

"Obviously one of the most important parts of the memorial will be that human experience of families, loved ones, visiting the memorial and seeing the name of the person who was lost," he says.

The Port Authority is the construction manager for the memorial. The memorial itself is being financed and designed by the nonprofit National September 11th Memorial and Museum through a combination of public and private funds.

DCM Erectors, based in Manhattan, received the contract.

The design calls for the nearly 3,000 names of victims to be etched into bronze. The railings will be back-lit so they can be visible at night. The names will be grouped in a variety of affiliations based on which towers they worked in, or whether they were first responders.
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  #213  
Old Posted Feb 5, 2010, 5:15 AM
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Quote:
Originally Posted by NYguy View Post
Port Authority Executive Director Chris Ward says the railing should be finished, along with most of the memorial, by the 10th anniversary of the attacks next year.
Looks like they are prepping the site for the actual railing or waterfall...

morrongiello (Feb 4)

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  #214  
Old Posted Feb 5, 2010, 11:35 PM
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FEBRUARY 5, 2010

Another look at work around the memorial waterfall and railings...



















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  #215  
Old Posted Feb 6, 2010, 7:19 PM
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they must be adding a good 5 feet of soil and other materials on top of the structure... otherwise that wall is 8 feet tall
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  #216  
Old Posted Feb 8, 2010, 7:34 PM
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^ they do have to plant trees.
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Old Posted Feb 18, 2010, 5:41 PM
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Quote:
Originally Posted by FerrariEnzo View Post
Looks like the concrete in the memorial plaza is at or near grade with regards to the "brim" of the waterfalls. If that is the case how can they expect to plant white oaks and other large trees... oaks have tap roots that are often at least 50% of their height if not more. I am guessing tree selection has either shifted or I am not seeing evidence of how they engineered to accomidate this.
I've been wondering this myself.
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  #218  
Old Posted Feb 19, 2010, 8:41 AM
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Time for the annual "bitchin" from Downtown residents...
http://www.downtownexpress.com/de_356/wtcnoise.html

W.T.C. noise goes up again with train hub excavation



By Julie Shapiro
February 19 - 25, 2010


After some months of relative quiet, the racket at the World Trade Center site is ramping up again, residents near the site say.

“The noise is getting worse and worse,” said Isabelle Moutaud, who lives a couple blocks north of the site at W. Broadway and Park Pl. “At first, it was every once and a while late at night. But for past two weeks, it’s been nonstop.”

The loud pounding noise Moutaud and others are hearing is coming from the east side of the W.T.C. site, where the new PATH train hub will rise. The Port Authority is excavating into bedrock there to eventually build the foundation of the transit hub. The excavation will also make way for a portion of the belowground vehicle security center.

To cut into the bedrock, the Port uses massive jackhammers called hoe rams, and that causes “the most invasive noise,” said John Kelly, a Port spokesperson. To mitigate that noise and speed the work, the Port uses blasting explosives during the day, Kelly said in an e-mail to Downtown Express.

“It’s unbearable,” said Biba Clark, who lives in Barclay Tower. She has made dozens of 311 calls in the past two years because of the noise, and she said the work got louder and later within the past couple weeks. Clark knows of people who have left her building to escape the constant humming, pounding and beeping, and she said she may not stay much longer either.

“I don’t want to move,” she said, “but it’s gotten to the point where you get a headache from the minute you walk into your home to the minute you leave.”

Online reviews of Barclay Tower show that Clark is not alone — many posters have complained about the W.T.C. noise in the building over the past two years.

Moutaud also said she was considering leaving the neighborhood unless the Port quieted down earlier at night and gave residents a break on at least one weekend morning.

“It’s too constant,” said Moutaud, who added that she gets no more than four to six hours of sleep per night. “It’s maddening.”

Kelly, with the Port Authority, said the Port constantly monitors the sounds emanating from the site. The noise does not exceed the city’s building code, Kelly said.

When work at the Trade Center site first went round-the-clock about two years ago, as the Port Authority rushed to meet deadlines, the Port agreed to pay for soundproof windows at several buildings within 100 feet of the site. The residents on Barclay and Park Place did not qualify because they lived too far away.

Pat Moore, who lives at 125 Cedar St. adjacent to the W.T.C. site and is the self-described “queen of noise,” fought hard for the windows and said they have made a difference in her building. However, the Port only paid for windows overlooking the site, and Moore said the noise still finds its way in her other windows.

Two years ago, the loud work was much closer to Moore as the Port excavated the Tower 4 footprint in the southeast corner of the site. The transit hub excavation is also on the east side of the site but is a little farther north, closer to the Barclay and Park Pl. residents.

Still, Moore, too, has noticed more construction late at night recently — but she said she’s gotten so accustomed to the constant din that she has stopped paying attention.

“At some point, you tune it out,” she said.
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  #219  
Old Posted Feb 19, 2010, 3:49 PM
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Want peace and tranquility? Move to Maine.
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  #220  
Old Posted Feb 19, 2010, 4:36 PM
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See, long-time residents don't have a problem with the WTC noise. It's not their fault that they have to rebuild one of the largest and most commercially-diverse complexes in the world. Okay? So....even if the noise is becomming louder, it won't be for much longer. They plan to erect steel sometime this quarter or next quarter.

By the way, they're erecting a new bridge for the southbound lane at West Street, thus another big shift for the future boulevard. At least there won't be any more obstacles.
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