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All of the foundations I layout have 12"W X 24"D beams

We're talking poured concrete grade beams with reinforcing...right? No footer.
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This foundation was also piered for extra kooking
So, basically, the piers are your footers. How many piers (on center), how large, and how deep? I assume the piers are also reinforced, including dowels at the top to tie into the grade beam...?
Did you perform soil borings to determine if the site required the additional support of the piers...or...just went ahead and added the piers, knowing the load above from the rock facade?