What about pouring a 3 inch wall around the inside of the hole. This would give the needed support to the dirt

Question

I have the hole dug, it is 8 foot by 8 foot. I want something to give good support so the ground does not sluff off during a rain storm, or when my sprinklers come on.

Answer 1

If you want the hole to stay open for further construction, you should be able to get four 4X4 posts and sheets of 3/4" thk. construction plywood for a temporary retainer.

Answer 2

This would be dependent on the height of the wall.

Is this just a square hole with dirt on all sides?

Will there be any kind of floor on the lower side? It could require much more than just a wall. Footings, steel reinforcement, more thickness.

E-mail me if you have more information, be glad to direct you.