On Friday, May 12, 2017 at 1:44:06 PM UTC-4, Michael wrote:
In a stone and clay crawl space, digging down I hit concrete along the wall?
How far from wall should I go through it so as not to risk the foundation
footing? I'll have to rent some kind of jackhammer to get through it.

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A related question is how much good a sump pump hole will do without
being connected to a drainage system that is installed along the
perimeter of the footings, which is what is typically done.