OP

Quoted from yaksplat:

The slab is normally poured once the house is dried in. I asked my neighbor that does concrete work why this is. He said that there are a couple reasons. One, to prevent damage. The framing crew drops a lot of things. Hammers, tools, beams. All of these can chip the concrete.
Two, framers are slobs. They'll drop plenty of things on the floor and not clean them up. All of the nails, sawdust and scraps will end up getting wet, holding water and leaving stains all over the concrete. No one wants rust on a new floor.
Three, sometimes people fall down open stairwells. This one is mainly for me. Stone over clay is a lot softer than a finished concrete floor.
Usually they cut a hole in the floor of the framed house and stick the chute in there then close it back up once the floor is done. Mine has two stairwells to choose from and they can drop a chute in either.
With a foundation this deep, you can't backfill it all at once. You risk putting too much pressure too high up. The full cure of the concrete and deck on top alleviate this issue. I did the first four feet and then the remaining couple feet of waterproofing could be finished. At this point I need to run all of the downspout piping around the foundation and connect it to the 6" drain pipe on the side of the house. Both of the sump pumps will connect to this piping. At that point I don't have to worry about water anymore.