Annual Washington Post Bucket Event 2010

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Potomac Riverkeeper Ed Merrifield, center, gives a tour of the... News PhotoGiving,Helm,Horizontal,Human Interest,Mid-Atlantic - USA,Potomac River,USA,Washington DCPhotographer Collection: The Washington Post 2012 The Washington PostWASHINGTON, DC - OCTOBER 9: Potomac Riverkeeper Ed Merrifield, center, gives a tour of the Potomac River as Whit Overstreet takes the helm Tuesday October 9, 2012 in Washington, DC. He will retire the post after about a decade on the job. (Photo by Katherine Frey/The Washington Post via Getty Images)