Pete, pass along the link to this book to those in charge of the project: Pump Track Nation (paperback or E-book). They absolutely need to get a copy. I have heard it referred to as the pumptrack builder's bible. It covers the basics of site drainage, berm construction, roller spacing, dirt estimates, riding techniques, and much more. It even includes dimensioned drawings for a few built and tested track designs.

I will be out of town this weekend otherwise I would be there to check it out.