With GPR we can evaluate the contents of concrete walls. We can locate and find any structural steel as well as locate anything else that might of been casted in the wall however rare of an occasion this might be. Another useful thing is we can tell the thickness of the wall being cored. If your planning 20 cores in a wall your expecting is 5 inches and it turns out to be 12 inches+ your planed times schedule might not work out, and your coring guys are going to be very unhappy. Even if you are just wanting to save some time scanning can be very useful for a project. For coring through concrete on average each time you hit rebar it can take as long to core through that as the rest of the concrete you are passing through. If you need 40 cores done quickly, placing them in ways to avoid all steel could have time savings up to 400%.