[TrickyDick]

I am starting to work on a project for this spring and need a little advice. Client has a rectangular pool surrounded by a mortared bluestone terrace. The terrace is then bounded by a curved retaining wall (I think its brick but not sure if there's anything else under that) that is about four feet high and about ten feet from the pool at the furthest point (the middle). They want to remove most of the bluestone and replace it with turf leaving only one course of 2x2 bluestone coping around the pool. I don't know how thick the slab is that the bluestone is set on and I will have to remove it all and dig down deep enough to provide drainage (through the wall) for the turf. My concern is this- How careful do I need to be about removing that slab? How easy would it be to crack the pool lining if I'm hammering a slab a few feet away? Is there anything else I should be worried about structurally? This doesn't seem like that big a deal to me but a little crack in a newly resurfaced pool could ruin my month pretty quick.