I live in northern OK near Enid. We have ponds in very sandy soil in Grant County that I bet only hold water because of A) high water table near the Salt Fork River or B) dugout ponds are in a natural clay liner. I do know about some ponds out in western OK that are in sand but just need to be dug down a few feet to reach clay. Have you done any investigation very deep? As far as the additives, search around in here, lots of info.
