[TowerTalk] Tower Base Placement

[Jerry K3BZ]

Which is better: Undisturbed earth that's damp most of the time, or dryer
earth that was "disturbed" 20 years ago when it was placed as fill in my
back yard?  Actually, I haven't seen any mention on TowerTalk of concern for
the water content of earth, just that it be "UNDISTURBED"...but it seems
common sense that a higher water content would make the earth around a tower
base less supportive... can anyone enlighten me on this?
Jerry K3BZ