A sad event in Boone, NC last saturday.
A freshly sealed parking lot got a heavy downpour of rain, which washed the sealant into a storm drain and subsequently into Hodges creek, a tributary of the New River.

http://www.goblueridge.net/index.php...shkill&catid=1

http://www2.wataugademocrat.com/stor...tion_id_003333

YouTube Video of the report done by the Watauga River Keepers.
http://www.youtube.com/watch?v=G5_QJ...layer_embedded