I need to get a driveway built, The drive is on a slope and I would need to fill the space with a lot of hard-core. I was speaking to someone and they said, I could dump some old bricks to fill some of the gap. Could I do that? Would this make the drive sit in future? We are talking about filling 3-5 feet. I need to knock a wall out, was wondering could I dump the old bricks in this place.