This weekend, I was digging a small trench behind my house to lay some corrugated tube to redirect rain water, and found this strange plaque about an inch below ground. I cleaned it up by sanding it and painting in the text, and it looks good as a decorative piece. The plaque reads "CO613 WK04 B PHASE." I have no idea to what this plaque signifies, other than it being used during some sort of construction (because of the phase and week identifier). Does anyone know what this plaque came from? I live in West Springfield, in the Cardinal Forest neighborhood.
Attachments: