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Right now, it's the ground beneath the car.
This is the parking area just to the side of our garage, and as you can see, it's packed rock. Or at least it was before Monday when I got out there with a pick and shovel and started taking out the rock layer. Got that finished tonight.
Next step will be taking out about four inches of hard-packed dirt, then building forms, putting the rocks back, laying in reinforcement, then pouring concrete. It's a 20 x 12 space, so it's a fair amount of work.
But, when it's done, it'll be much neater and a much safer place to jack up a car (should that ever be necessary...) than it is now. Maybe a carport will also go over the top - who can say?