Not Sure, the whole pond was CLAY, CLAY and more CLAY. Very Hard, nearly like concrete. Everyone who has seen it in person has said, you'll have no problem holding water with this thing. Only downside is I have not much drainage. About 3 acres into 1 acre.

My only question, why would these spots not show up right away? It took a week for them to show, wouldn't they be there right away? Like I said, we had ZERO rain since the lake was finished.

Hopefully, it is nothing to be too concerned with.