Steep driveways -

[PP]

Crushed concrete waste from demo buildings with the rebar extracted is a common material for base work on sloping roadways. You still have to get the topsoil off and the geo cloth helps tremendously. Even the Oregon DOT uses this because it's relatively less expensive and compaction is unbelievable.

[Hartley]

A 50 ton concrete truck makes a great compactor as well
as a few passes with a 70 ton tri-axle dump truck.

I know, Thats not helping.