So am I understanding that trucking in traditional clay is a better alternative than trucking in bentonite and trying to work that in? The hole of my pond is 4.5' deep before the dam begins on one end and takes it up to 9'. My dam leaks right at the point where it meets the natural grade of the land right at that 4.5 -5' area and I don't see any leaks any where else. Of course I guess I could have a leak at the bottom and not no it as well. Good grief, ponds are fun, but they sure can be a pain.