Rotten egg smell, hissing sound are key signs of a natural gas leak
DENVER -- Someone strikes an underground utility line every six minutes in the U.S. All it takes is one spark to cause a disaster. Keeping families safe means knowing the signs of a possible gas leak and heeding those yellow flags that mark underground gas lines. Whitney Nichols of Colorado 811 said a simple phone call before digging can mean the difference between life and death.