Hi,

Have moved into a 30 year old house that has an asphalt driveway with the
house at the bottom of.

Near the bottom there is what I believe is called a "dry-well".
There's a heavy metal grate that is over what I guess can be called a "pit".

At one time the metal grate was level with the asphalt, I would imagine, but
isn't any more. The grate has sunk about 6 or 8 inches, and the asphalt
looks "collapsed" around it.

In the Spring will probably have a top coat of new asphalt applied, or the
present asphalt dug up and I guess new gravel put in place, and then the new
asphalt.

Haven't gotten any quotes yet on the two approaches, although the digging up
the old, and placing new gravel down is probably the better, and more
expensive certainly, way to go. What do you think ?

Questions, please:

a what is typically done: just the top layer removed and a new asphalt
layer of a few inches placed right over the existing gravel ? Or, should
one always dig up the old gravel and replace with new gravel ?

Suggested thicknesses for new gravel, and for the asphalt.

b. How were these dry wells usually constructed. Can't tell by looking.
Is it likely they placed some sort of pre-cast pit in there first ? Or,...
?

If it has sunk a bit, how would it be repaired to bring the surface of it
level again ?

Would like to learn a bit about these things before asking contractors over.

Thanks,
Bob