[GWN7]

Also depending on your soil conditions you may be required to install piles or ground hogs (depending on what the engineer requires) before you can build your footing.

Infill houses next door were required to go down 24' from the 10' deep basement hole they had dug for a total depth of 34" from grade with ground hogs. It would have been the same with belled concrete piles at a higher cost so they went with the ground hogs which were welded directly to the footing steel.