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From SunSpot:

Since the Environmental Protection Agency put Fort Meade on its Superfund list of the nation's most hazardous sites in 1998, regulators have been pushing for an aggressive cleanup of the 5,400-acre complex.

Despite repeated requests, though, officials at the National Security Agency have refused to share with either Army officials or government regulators crucial information about environmental conditions on its section of the Odenton post.

They're basically claiming that their dirt is classified, even though many of the pollutants at the site predate the creation of the NSA.