http://articles.mercola.com/sites/articles/archive/2003/06/14/rocket-fuel-lettuce.aspxLettuce and other vegetables grown in fields irrigated by the Colorado River may contain higher amounts of toxic rocket fuel than is considered safe by the U.S. Environmental Protection Agency (EPA). Leafy green vegetables grown with contaminated waterenCommunityServer 2008.5 SP1 (Build: 31106.3070)