The Town of Frisco (population 2,800) lies amid three major ski resorts in Colorado. That means district manager Butch Green and his team at the Frisco Sanitation District have a dual challenge.First, they need to keep sending clean effluent out to the Lake Dillon reservoir even on special holidays that can attract more than 20,000 tourists. Second, they need to be essentially invisible. They succeed admirably on both counts.The 2-mgd (design) activated sludge treatment plant consistently meets its BOD and TSS limits as well as a stringent phosphorus limit that requires advanced water treatment (AWT) units. And tourists rarely notice
