Tension Cables / Fresh Slab

New construction building with tensioned slab. A plumbing fixture had been damaged during the pour, and was not discovered until days later. We were called out to locate / mark the tension cables so that the plumber could excavate between the tension cables to repair his sewer line. We were able to mark out the tension cables, and also see his pipe at 23inches deep. Even located the broken pipe that had been laid over during the concrete pour.