Plumbing... what a mess!

Our nice new 4 day old slab looks more like a dirt bike track than anything else.

I was advised tonight from a friend who is also building right near us that there were excavator tracks all over our 4 day old slab. Worried there could be damage, I've bundled my 3 children into the car at 9pm and taken the 5min drive to our block to find this:

Not quite sure what to make of this other than plumbers are messy!

I couldn't check the whole slab as it was late at night and the only light I had was from the car head lights (plus big holes and me in thongs were not a good combo either).

I just find this weird as I have not seen this before on any of the houses that have gone up in the new estate.