so, the raised concrete slab got poured wrong (no footer) so the dirt/gravel base underneath is loose and exposed once the forms came off. I know this was done wrong, but now my question is what to do, considering erosion is going to slowly compromise the base.

Should I work as much as possible to frame a pressure treated wood wall around the bottom?

If I build mounds around it will that help (I doubt it as I would assume the material under the slab would slowly dribble out as erosion on the mound happened….

Thoughts? Any other ideas to help fix my mistake?

here are some pics