Earthworks- Land Backfill- Fear of Washing Away

Hi,

We've recently backfilled this plot so as to make it level.
We will be throwing a concrete slab on top then putting up a Pre Fab structure on top of concrete.

I am a little concerned about the Backfill Slope, which I think may wash away with rain. Please advise?

Also, do you think that the neighbors wall will fall down?

The fill is a combination of Clay Bricks, Motar, Hard Rock and sand.
I have attached a whole lot of images which might assist you in advising me.

PS, I am NOT a civil engineer.

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Neighbor compound wall shall be strengthened as fill is more, a retaining wall (may be at your cost) shall be built at the neighbors compound wall, other sides slope of 30 degrees to 45 degree tob maintained and stone pitching can be done if you have sufficient area. If you want area full utilization, then all sides retaining walls to be done with a ramp at gate.