Defined Cored? Do you mean did he put a keyway in?

I was only there for part of the excavation, the entire project was done with a Dozer, the excavator is a good guy and used by many in the area he has been in business for 25 plus years. He also built my pond the year before, which I have had no issues with.

I'm not sure how well a keyway can be constructed with a dozer?