They dug a test hole on Sunday. The clay based subsoil started to show some shale at about 14 feet. So they will stay out of that range. probably stay in the 10-12 ft. which gives me 12-14 feet of water.

I am going to have a local pond builder come out and do the finishing touches on it. Create some mounds, valleys, drop offs, flat areas.

Should i be putting the top soil back ontop of the clay after they are done? Or just put the top soil back along the edges that I want grass/vegetation?

I'll see if they have a sheeps foot available to pack it all in after they are done. Thats a really good idea sir. Thanks.