Alvin Robertson recalls his first look at a deteriorating i manhole, which inspired a new program to systematically map, inspect and rehabilitate his city’s sewer manhole network.“It was 2003, and we were working on a lift station that was pumping into a manhole located in an intersection nearby,” says Robertson, sewer collections superintendent with the Municipal Utilities Department of Chandler, Arizona. “We decided to pop the frame and cover for a visual inspection and we couldn’t even see the manhole. All we could see was dirt — and then everything started breaking loose. We blocked off traffic and got the
