A sewage treatment facility in Kent County, Michigan, lost 15 million gallons of sewage in March, though to where no one knew. Until now. Green dye mixed with 1000 gallons of water was fed through an 8-inch-diameter hole in the 1980s-installed liner. The dye appeared in a swamp nearby. No environmental damage was detected. Officials are now faced with a $200,000 repair, but it will include modernizing the liner system to current technology and standards.