I have a condo the building is 2 story with a pad foundation, Since the pad needs to be opened up to find the leaking pipe under it which belongs to another unit. What is the correct way for opening the concrete pad foundation? I don't believe it should be jack hammered by the contractor, I was told it should be cut. I'd like to confirm this. I was also told that jack hammering would ruin the structure. Is this true & how can I confirm that?