F Russell writes:

The soil around one corner of my home has subsided for
about 12-18 inches. For a length of about 10-15 feet
the top of the basement wall is exposed.

Is it safe to leave it like this or should I dump a load
of dirt to raise the ground level?

If that happened quickly, you may need an engineer.
If the soil got washed away you many need
gutter work.

Otherwise, the ground must slope away from your house.
Fill it in.


--
Dan Espen