National Park Service Ranger Niki Williams speaks to reporters on the National Mall, in Washington, Tuesday, Sept. 27, 2011, as engineers begin their inspection of the Washington Monument for damage from the August 23 earthquake. Williams was on the observation deck when the earthquake struck and helped lead 20 visitors to safety via the staircase. (Photo by Jeff Malet)

National Park Service Ranger Niki Williams speaks to reporters on the National Mall, in Washington, Tuesday, Sept. 27, 2011, as engineers begin their inspection of the Washington Monument for damage from the August 23 earthquake. Williams was on the observation deck when the earthquake struck and helped lead 20 visitors to safety via the staircase. (Photo by Jeff Malet)

National Park Service Ranger Niki Williams speaks to reporters on the National Mall, in Washington, Tuesday, Sept. 27, 2011, as engineers begin their inspection of the Washington Monument for damage from the August 23 earthquake. Williams was on the observation deck when the earthquake struck and helped lead 20 visitors to safety via the staircase. (Photo by Jeff Malet)