"kevin" writes:

You may (possibly!) be able to find someone around your area that will
take the asphalt for free. Keep an eye out for signs asking for "Fill"
on the road side or in the local classifieds. Most people would want
mostly dirt, with only a little asphalt. But someone might be happy
with pure asphalt, especially if it isn't too much.

Asphalt is recycled into asphalt.
Call a disposal company, they'll know where to take it.

Being an oil based product, I don't think it is suitable as fill.