Bob, i'm not quite sure if I hit limestone but I have went around our heavily wooded property and found numerous areas where water just runs out the ground out of nowhere. I'm thinking I hit one of those veins and when the pond fills up it seeps in and most likely runs through the entire property, I hope thats not it, but thats likely. How do you do well for a pond? My experience is limited. The pond was not needed to be lined with clay for the reason 99% of it is nothing but clay. I have 3 tree stumps and a solid core. Other than that hole, i'm dumbfounded.
