We had a phone line located, and we hand dug a couple times across it to verify its depth. It was at 24". Because it was a consistant depth across the entire property we decided it would be fine to plow across it and not hand dig every crossing point. As luck would have it, there was a splice in the line inside a buried valve box (aroud 3" deep). I didn't even feel it with the plow. Plowed right through the valve box (10" round) and snapped the splice in half. When we dug, we found a perfectly cut in half valve box with a 1" PVC pipe in the middle of it. It was funny. Anyways, There was a marker donut inside the box, the Locate guy should have marked that so we would have known there was a splice there right? Seems to me that he should have, Its going to be frusterating to have to eat the repair cost otherwise.