The design requires that the holes be overdrilled so that no part of the new piles can come into contact with the Old Bay Clay and put any weight on this weak subsurface layer.

该设计要求对孔进行过度钻孔，以便新桩的任何部分都不能与老湾粘土接触，并对这个脆弱的地下层施加任何重量。