Trees, Shrubs and Conifers: Dollar (or Pound) tree hole, 2 by ViburnumValley

ViburnumValley wrote:
And here, I thought you were a farmer...

If indeed you are bent on this much effort and disruption and conversion of your existing conditions - get thee to some machinery! Instead of all that well-intentioned but imaginary handwork, a simple excavating device would serve you so much better. You can move the same stuff over and over and over, and as deep or deeper than you would ever conceive of doing with simple muscle power.

A backhoe would work fine. If your operating space is too confined for that, there are mine-excavator with tracks that can be driven through a 4 foot garden gate, and swivel 360 degrees in place. Combine that with a simple tiller to mix anything you want mixed, and you'll be amazed at the damage you can do on a fine fall afternoon.

Maybe you need to bring in a consultant to help demonstrate...