FILE - In this May 13, 2011 file photo, arborist Jeremy DeSimone, left, sprays fertilizer on a swamp white oak at the National September 11 Memorial at the World Trade Center site in New York. The foundation that runs the memorial estimates that once the roughly $700 million project is complete, it will cost $60 million a year to operate. (AP Photo/Mark Lennihan, File)

Associated Press
FILE - In this May 13, 2011 file photo, arborist Jeremy DeSimone, left, sprays fertilizer on a swamp white oak at the National September 11 Memorial at the World Trade Center site in New York. The foundation that runs the memorial estimates that once the roughly $700 million project is complete, it will cost $60 million a year to operate.  (AP Photo/Mark Lennihan, File)
FILE - In this May 13, 2011 file photo, arborist Jeremy DeSimone, left, sprays fertilizer on a swamp white oak at the National September 11 Memorial at the World Trade Center site in New York. The foundation that runs the memorial estimates that once the roughly $700 million project is complete, it will cost $60 million a year to operate. (AP Photo/Mark Lennihan, File)
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