Gigantic mole hills

While we're still in the process of turning the site upside down, spare a thought for this bizarre sequence of event: After demolishing the structures we had the most perfect, level, plot. If it wasn't for the drains we could have started foundations straight away. Then everything was turned upside down with trenches being dug for the replacement drains on the perimeter of the new building. Now we have several sizeable mounds of A-grade clay soil covering the whole site. The guys know what they're a doing but it's a shame all that hard work levelling has been wiped out.