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I don't think it is a big deal at all. The pool had to be structurally engineered in your area, so it is likely that the rebar in the pool is less than 12' apart and the gunite is a foot thick. Gunite is strong stuff. A lot stronger than the slab. I really dont think the slab will be any thicker than 4" and rebar will probably be no closer than 4' OC. Most likely it is less.
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