If it's a new pool, you should be able to contact the manufacturer for that info.
But, having seen a lot of pools that are out of level, assuming that your pool has a skimmer, you almost certainly can get by with 1" max. That's not ideal, but will work. Very, very few pools are actually installed to within 1/16". Also 1" over all tolerance does NOT mean you can go from 1/2" hi to 1/2" low within a few feet. Doing so will very likely cause installation problems.
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