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Contact: Mike Litterst, 202-245-4676WASHINGTON – The National Park Service has begun a 15-month project to restore the roofs, repair the stone, and clean the marble at the Thomas Jefferson Memorial. The memorial will remain open for the duration of the project, although some areas will be inaccessible.
Cleaning the visible marble on the dome and roof of the memorial will utilize specialized lasers to remove the black biofilm (a microbial colony of algae, fungi and bacteria) seen growing on upper portions of the memorial. The biofilm was first noticed in discrete areas of the white marble in 2006 and has become more pronounced in recent years. The National Park Service studied this growth since 2014 to determine the best treatment options.
Access to the front of the memorial, including the steps, accessible route, chamber with the statue of Thomas Jefferson, exhibit area, restrooms and elevator will remain open to the public during the construction. The east side of the memorial will be closed for construction staging.
The contract for this work was awarded on September 19, 2018, to Grunley Construction for $8.750 million. The Thomas Jefferson Memorial roof replacement, stone repair and biofilm removal project expected to be complete by May 2020.