For smaller (4' x 4' and less) holes, I use a "one man" gasoline powered
post hole digger to break up the dirt. This is particularly helpful in
clay-gumbo type soils.
Several holes are drilled around the parameter, and the loose soil is
easily removed by shovel. This operation is repeated 3 or 4 times until
the desired depth is reached.
However ... these "one man" powered post hole diggers do not work at all
with any significant amount of rocks in the soil.
-Brian
n0pmz
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