The city of Zanesville is taking another step toward cutting the odor from the troubled waste water treatment plant...and it's thanks to an Ohio EPA loan. $1.3 million will be specifically used on the roofs of the plant's digestors. According to Public Service Director Mike Sims, the digestors' roofs are between 40 to 50 years old and not safe anymore for workers to walk on. This project is a precursor to the entire plant upgrade, costing an estimated $20 million. The work on the digestors will begin in four to twelve weeks and will end next summer. The plant upgrade is in the final stage with the Ohio EPA.