It was only a 2 acre plot that a bank owned and wanted to clean it up a bit, put a driveway in and culvert. Literally walked the whole 2 acres in 5' swaths and the grass hid it, I found other pieces of angle and 2x12s and other garbage but missed that one.....was glad I started after the homeowners left next door. When they got home from work I told them what happened. They ended up contracting us to build a retaining wall the next day to bring grade up on the side of their house. It all worked out.