I agree. About all we could do is use the trackhoe bucket to push and tamp the clay in the ditch, which is OK, but not true compaction. But we did plate over it with a good bit of clay and also made the core ditch through the sand pocket extra wide, hoping to compensate for any settling.

So far the water is still rising at a steady rate, which hopefully means it's sealed, or is sealing off, without water running through the sand pocket. The water is getting to the right level to do that, if it's going to.

I'll keep you posted. I marked the water level yesterday, and today it made another nice little jump.