Acid Mine Drainage
This is a pipe driven into the hillside draining a mine somewhere beneath the hill. The mine has filled with water and the leached pollution is pouring quite freely from the pipe.
I was contacted by the Ground Water Protection Council asking permission to include my photograph in their document "Ground Water Report to the Nation: A Call to Action." Permission was granted under Creative Commons and you can find it included in Section 10: Groundwater & Abandoned Mines at www.gwpc.org/calltoaction/