The sheepsfoot should be used as they put the clay back in the hole, in 8 inch or so layers. You want to end up with 18"-24" thick layer that is knitted together when they are done.
I don't think that they are going to be putting clay back into the hole. They are starting to take the topsoil off today and store it on the next to the pond. They have asked me if I want to put the topsoil back on top of the exposed clay once they are done. That is the question I don't know the answer to.
I know vegetation needs topsoil to grow, but is it necessary for the bottom of the pond to have topsoil?
Also, he sent me over a digital CAD drawing of the proposed pond. See attached file. 3:1 slope all the way to depth. Which will be 12-14 feet.
