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I think the real answer to your question is a regional one. You might get better answers from your local city hall where they issue building permits. They often have literature there with specifications.

In my area the soil is sandy and doesn't hold moisture. I normally use a tractor with a post hole digger and put a 12" hole about 3' deep and then dig a square hole 18"x18"x 3 1/2" around the hole and put a form in flush with the ground to pour the cement in.
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