How can you make sure the landscape can be returned to its original state?

One of the licencing requirements is that we shall return the landscape to its original condition when the licencing period runs out. For this reason, we are building the installation in the least invasive way possible. Before starting the construction of turbine foundations, roads and crane pads, we stored electronic data that can be uploaded into diggers and which enables us to return the topography to very nearly the same state as before building started.