The clay is great for a bottom. But, for a dam it needs to be mixed into loam. Bottom line is that sand won’t hold water and pure exposed clay cracks when dry. And, the top will dry out. Have it mixed and be sure to have him do a core trench, also called a key way.

It's not about the fish. It's about the pond. Take care of the pond and the fish will be fine. PB subscriber since before it was in color.

Without a sense of urgency, Nothing ever gets done.

Boy, if I say "sic em", you'd better look for something to bite. Sam Shelley Rancher and Farmer Muleshoe Texas 1892-1985 RIP