Cory Engineering and the City of Dunlap Recently Won the Excellence Award for Upgrades at the Sewer Treatment Plant. Award-winning, multi-discipline consulting firm Croy Engineering and the City of Dunlap, Tennessee were recently honored with an Engineering Excellence Award for upgrades on the City’s sewer treatment plant. The “Honor” award in the “Waste and Storm Water” category recognized the project. Croy worked with the City to provide engineering design services and oversee construction to rehabilitate the existing facility, which had not received any major upgrades in more than 30 years.