My house is 2 story house with crawl space. one side of my house was very low and had the foundation raised with 7 Helical pile. about 5 inchs one corner and less on other side. Now there is gap between the ground and footing. I'm told, I do not have to fill in the gaps since the Helical piles will take the load and will not sink.

My question is, what is standard practice for my situation? Do they normally fill the gap with something? or leave it as is.