This photo taken April 16, 2012, shows remnants of a tire and rim along the shoreline of the Middle Branch of the Patapsco River in Baltimore, Md. This archival image was taken for the "Documerica" program, begun in 1972 by the new Environmental Protection Agency, to document subjects of environmental concern. (AP Photo/Patrick Semansky)

Associated Press
This photo taken April 16, 2012, shows remnants of a tire and rim along the shoreline of the Middle Branch of the Patapsco River in Baltimore, Md. This archival image was taken for the "Documerica" program, begun in 1972 by the new Environmental Protection Agency, to document subjects of environmental concern. (AP Photo/Patrick Semansky)
This photo taken April 16, 2012, shows remnants of a tire and rim along the shoreline of the Middle Branch of the Patapsco River in Baltimore, Md. This archival image was taken for the "Documerica" program, begun in 1972 by the new Environmental Protection Agency, to document subjects of environmental concern. (AP Photo/Patrick Semansky)
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