Thanks jas.
What I'm hoping is that there will be enough clay to mix in with the very sandy soil. I thought I had Tifton soil, but using a better survey I see that both the creek and the pond site are in a mixture of
Osier and
Bibb soils. To my uneducated brain neither look like good pond building material. On the other hand something is holding water pretty well in places in the creek and pond site. At least the Bibb soils have a moderate permeability. I would guess the the creek is Osier since it drains extremely quickly. I did find those few pieces of pure clay, so I'd like to believe the contractor is right to assume he can build a leak-free pond. He doesn't guarantee it though.
