I will be building on a 3/4 acre site, its a sloped site sith good soil. I am cosidering stripping back a layer of topsoil from the complete site and making heaps of it to ensure I will have unspoilt topsoil to complete the landscaping etc in a couple of years. Is this advisable or is it sufficient just to strip back necessary ammount and wire off the rest of the site? I have seen many sites where the whole site becomes damaged over the course of the build from machines, laying drainage etc.