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This is from The tuff lift manual, hopefully it helps?

Consult building owner and / or architect’s plans when applicable to establish the best lift location. The lift should be located on a relatively level floor with 4” (102mm) minimum thickness, 3000-psi concrete slab that has been properly cured. There can be no cracks in the slab within 36 in. (914mm) of the base plate location, and no seams in the foundation within 6 in. (152mm) of its location! Remember: any structure is only as strong as the foundation on which it is located!