"DENVER -- Authorities are investigating after construction crews discovered a problem with a liquid gas pipeline that allowed a carcinogen to seep into the ground near a large creek that feeds into the Colorado River."

"The leak near an energy plant in Western Colorado was discovered largely by accident, even though several state and federal agencies are charged with monitoring gas pipelines in the state.

'It's possible that we've narrowly dodged a bullet this time,' said Michael Saul, with the National Wildlife Federation."

Alexandra Tilsley reports for the Associated Press April 2, 2013. [2]