You are getting somewhat boring with your arrogance Teribus - at least you once used to be entertaining.
You have the facts - live with them or choke on them - your choice.
We are well aware that all these people are either liars and ignoramuses and that you have all the answers - you really are one of our unappreciated national treasures.
I well know what bulldozers are capable from personal experience - my father operated one for Wimpey's for the first twenty years of my life - he even tried (unsuccessfully) to teach me the basics once).
One of his jobs was to level out the dredgings from The Manchester Ship Canal and BURY the harder, larger stuff.
True - I wasn't there to see him do that, so it's quite possible he was lying.
Jim Carroll