We recently bought an old Victorian house in Berkeley, California, and after we moved in I noticed a couple of laminated wooden boards aligned on the floor by the side of the house. I have no idea why they are there, but it seems like someone very deliberately placed them. They're next to the water/gas line, but they are not covering any pipes that I can spot with minimal digging. Any idea what purpose this might be serving?
I removed the board to take this picture, showing that it doesn't seem to cover anything: