Yes but taxpayers money used to buy earth, that is sold by a private company that has used taxpayers money to dig the earth out of the ground...........hmmmm
It would appear the contract was to dig large holes - which the customer received.
The cunning bit seems to be that the contractor acquired the ownership of the spoil - possibly by the contract requiring that they "dispose" of it? Which they were then able to sell at a profit.
I would ask who wrote and approved the terms of the contract; and who then ran and sat on the board that awarded the contract; and - if as reported the individuals concerned were shareholders - at what stage they acquired the shares and whether there was a conflict of interests.