In this situation we have an aparment in virginia beach in the kings grant area that had water comming into the kitchen through floor. The structure has cast iron for drain pipe and this apartment is probably the 10th one out of 50 apts that we had to break the slab to replace sections of cast iron pipe until we got to good solid pipe.
Usually we would run into good pipe after a Y joint in the pipe where the upstair and downstair apartments kitchen drainlines would meet.

I went to remove the cabinets so we could break the slab and when i was pulling cabinets there was finishing nails driven into a piece of plywood at the back base of one of the cabinets, and when I went to remove the board water came shooting out so I grabbed the camera.