I know this is a very stupid question but I am being bugged constantly by the architect to get an idea for estimate purposes of what the footing sizes would be for a 7 story structure. He keeps telling me to assume rock at 3' depth (river bed in the area). I know what to assume for regular footings for estimate sake, 2000-3000 psf. But the heck could I assume (which I would clearly state to the arch) for a rock at 3.
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