Sanitary Sewer Rehabilitation Using Cured in Place Pipe (CIPP) in the City of Aurora: A Municipal Owner's Perspective

The City of Aurora has over 2.5 million feet of sanitary sewer in need of rehabilitation. The pipes are vitrified clay pipe (VCP) that is over fifty years old and has exceeded its original design life. Aurora Water plans to spend $5 million annually to rehabilitate the sanitary sewer pipe ranging in size from 8 to 27 inches in diameter. The following critical items of the CIPP process will be discussed: liner thickness required; wet out calculations and resin strength; long-term creep testing for different resins as it relates to a 50-year design life; construction inspection; software used; tap activation; extended tap trimming; data storage; and public involvement. This paper will serve as a practical guide to municipal owners desiring to use trenchless technology (CIPP) to rehabilitate their sanitary sewer systems, and as instruction on how to be sure that they are getting a system that will maximally extend the life of their asset.