The depressions in the slab are so the drains from the west and north sides of the basement can get to the reservoir for the sewage ejector.  These pipes, once set in place, will then be covered with concrete under the 14 inch structural slab.

Depressions for drain pipes from the west side of the basement.

At the same time as the plumbing rough-in, the remaining insulation on the west side must be put in place.  Of course, the waterproofing will go over the wooden forms on the north and south walls, and over insulation and east wall.

Putting the wooden forms in place on the east side of the north wall.