Well, you would be surprised how often this happens, and with more plastic (non-conductive) pipe going in the ground every day it is only going to get worse.
So it is for this reason that Geelong Cable Locations invested in a high tech locating tool called Ground Penetrating Radar. In fact, the need for Ground Penetrating Radar has become that high that we have gone out and put a unit in each of our locating vehicles. This way every single job we go to we can get the GPR out and scan over the work site if needed.