The Enviromental Protection Agency investigate a tip, Tuesday, Nov. 29, 2011, that an oily muck is running into Sand Creek near Suncor Energy in Commerce City. Crews work on cleaning an oily muck that is running into Sand Creek near Suncor Energy in Comme

The Enviromental Protection Agency investigate a tip, Tuesday, Nov. 29, 2011, that an oily muck is running into Sand Creek near Suncor Energy in Commerce City. Crews work on cleaning an oily muck that is running into Sand Creek near Suncor Energy in Commerce City. RJ Sangosti, The Denver PostRJ Sangosti, The Denver Post (Photo By RJ Sangosti/The Denver Post via Getty Images)