We will probably have a pond dug to supply the dirt/clay for our house site preparation so we figured we would just make the pond big enough to supply the clay for our driveway. I will give the geotextile some more thought and consideration before we make a move though.
Are you scraping the topsoil off your driveway area before laying down the cloth and roadbed? 600'x10' would sure give you a lot of dirt to spread somewhere else where it might be needed after your house and barn are built...