Design load was for 10 tons per pile, but that was using smaller piles. Not sure where we are with the larger piles, but will be fine.
The soil is also the determining factor for the piles. There is about 12 feet (if I remember correctly) of clay that these are going through to get to the glacial till, which is what I am in building the wall. I am told there is a noticeable increase in resistance when the pile reaches the glacial till. That is very good load bearing material.
There is ledge relatively close by, but too deep to find with the piles.