Hi,
lean back, relax and just sign the contract, everything is fine, there is no disadvantage and no problem.
There is also no claim to "as before" or dismantling or anything like that, because this is a brand new development area, the current state is the first.
But none of that matters, everything is fine. The gravel, even if it has some dirt on it, you can use it for many things later and don’t have to transport the material. Your construction company certainly won’t dig the pit with a shovel, but will bring equipment, then it will all be done in half an hour.
I already understand that future builders see many problems that aren’t really that bad. Just talk to the guys on site, not in inflated official German, but just like you talk with your friends and everything can be easily sorted out.
They are all friendlier than it looks from a distance and often are willing, for a small tip, to quickly move the 40m³ pile after work.
At least with me it works out great this way. For 20€ and 2 after-work beers, the wheel loader worked for a good half hour and I could borrow the heavy vibrating plate over the weekend, if there’s another after-work beer on Monday.
The official way would have cost 300-400€ for the operation with invoice, travel, etc.
Life is all about give and take... and always be friendly.