Executive Director Chris Ward says the Port Authority of New York and New Jersey is still determining how much public access will be allowed while the construction continues.
Reflecting pools over the twin towers' footprints and walls with the victims' names engraved on them will be built by Sept. 11, 2011.
Construction on the memorial began in 2006.
Ward spoke at a state Assembly committee hearing on Thursday.
NEW YORK AND TRI-STATE AREA NEWS
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