The driveway was probably installed over a poorly prepared base like
the half assed grading common to many new subdivisions. Over time it
has compacted, especially if they used trash in the fill, another
common mistake. Your options are a) tear it up and do it right or b)
get someone to probe the surrounding soil for voids and then tear it
up and do it over. Whichever, good luck.
Now you know what to get her for Christmas. A jack hammer.
So you get a concrete saw and cut nice smooth lines and tear out the
sunken part, dig a little and find out why it settled, fix it, back fill
it properly, form up, and call Mr. Redix Mix.
A nice Sunday afternoon project.
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