We were recently engaged to help identify firstly what the actual utilities under a bridge were and then to find out where they lead . This was because ultimately there was an issue with the pavement and a therory was a water leak somewhere down the line causing this. There was no documentation available for any of this. Firstly looking under the bridge we were able to identify what service was for what , then we were able to trace these out . To help figure out what was going on.