I recently helped my friend Brian with a drainage project. Always enjoy a chance to use the backhoe. I'm getting better with it.
This project had another twist. We wanted to put the drain right by the concrete slab, but after digging down, we found that when originally poured, the concrete had oozed out under the forms, leaving an annoying mess in the way of our drain.
So, Brian brought out his trusty air hammer/chisel. It solved the problem handily. I need to get me one of these!