wrote in message
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Now my only concern is the fact that the foundation was
built on land fill dirt that had only been in place for less than a
year. What's the worse case senerio for a situation like this? Cracks
in the foundation? Can that be fixed?

Building on fill is fine, and may, in some circumstances, be preferable. If
the fill is properly compacted then no problem.

Did they use anything to compact the fill?

Such as this

http://tinyurl.com/8ozms