Disaster_Accident

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Rescue personnel search the scene of a four-story building collapse in downtown Philadelphia on Wednesday, June 5, 2013. The building was being demolished. (Associated Press)

Emergency personnel respond June 5, 2013, to a building collapse in downtown Philadelphia, where the city fire commissioner says as many as eight to 10 people are believed trapped in the rubble. (Associated Press)

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Scaffolding rises to the top of the Washington Monument in Washington, Thursday, May 2, 2013, so craftsmen can make repairs to the 555-foot marble obelisk that was damaged in the August 2011 earthquake. (AP Photo/J. Scott Applewhite)

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Workers begin building scaffolding around the Washington Monument to make repairs to stonework damaged in the 2011 earthquake, Washington, D.C. region, Washington, D.C., Thursday, March 7, 2013. (Andrew Harnik/The Washington Times)

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Scaffolding rises to the top of the Washington Monument, Thursday, May 9, 2013, in Washington, so craftsmen can make repairs to the 555-foot marble obelisk that was damaged in the August 2011 earthquake. (AP Photo/Carolyn Kaster)

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Marine One, with President Barack Obama aboard, flies past the Washington Monument as workers build scaffolding to the top, Thursday, May 9, 2013, in Washington, to make repairs to the 555-foot marble obelisk that was damaged in the August 2011 earthquake. President Obama is en route to Texas, as part of his Ã¬Middle Class Jobs & Opportunity Tours." (AP Photo/Carolyn Kaster)

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Construction beams and netting line the ceiling of Union Station as contractors continue their repair and maintenance efforts on the historic icon, in Washington, DC Tuesday, May 28, 2013. (Andrew S Geraci/The Washington Times)

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Scaffolding encompasses the entire building as renovation efforts are put in place at the Smithsonian's Art & Industrial Building, in Washington, DC Tuesday, May 28, 2013. (Andrew S Geraci/The Washington Times)

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Scaffolding encompasses the entire building as renovation efforts are put in place at the Smithsonian's Art & Industrial Building, in Washington, DC Tuesday, May 28, 2013. (Andrew S Geraci/The Washington Times)

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Through a barbed wire fence,the Washington National Cathedral shows signs of construction repairs in the months following the earthquake which damaged the landmark, in Washington, D.C., Wednesday, February 22, 2012. (Rod Lamkey Jr/The Washington Times)

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Cathedral Stone Mason/Stone Carvers Sean Callahan and Andy Uhl, right, pose for a photo on the top of scaffolding constructed on the north east corner of the Apse, the eastern most point of the Washington National Cathedral, Washington, D.C., Monday, April 22, 2013. Repairs continue on the Washington National Cathedral, which sustained millions of dollars worth of damage from a 5.8 magnitude earthquake in August of 2011(Andrew Harnik/The Washington Times)

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Head Stone Mason Joe Alonso stands on scaffolding which has been constructed to repair spires that broke off the Washington National Cathedral during a 5.8 magnitude earthquake in August of 2011, Washington, D.C., Monday, April 22, 2013. (Andrew Harnik/The Washington Times)

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**FILE** Steve Lipsky demonstrates how his well water ignites when he puts a flame to the flowing well spigot outside his family's home in rural Parker County near Weatherford, Texas, on Nov. 26, 2012. The U.S. Environmental Protection Agency had evidence a gas company's drilling operation contaminated Lipsky's drinking water with explosive methane, and possibly cancer-causing chemicals, but withdrew its enforcement action, leaving the family with no useable water supply, according to a report obtained by the Associated Press. (Associated Press)