Digging out a run

[NorthwoodsChick]

How deep is your caliche layer? Deeper than you need to dig? Once you hit it, you might as well start blasting, it's like concrete. If you can get away with not hitting that, just buy/rent a tiller and break it up in layers. Till down, scoop out, till own, scoop out, until you get the depth you need. Then line it and backfill. You can even do it in sections if you need to.

Great idea!