"The California Highway Patrol said that if the bombs had been triggered, they could have opened the valve and released water. A bomb unit detonated them in a safe area."
http://www.mercurynews.com/mld/mercurynews/news/local/states/california/northern_california/16654769.htm
That's interesting. Thanks for the pointing to that article, Oorang.
http://www.freerepublic.com/focus/f-news/1777773/posts?page=457#457