House built in early 70s. Last few years, I'm seeing some increased cracking of the concrete driveway. Also, end of one slab has sunk approx 3" below the adjacent slab over the last 5 years.
Is it possible that decaying matter under the driveway is just now beginning to cause this? What's most expensive part of replacing concrete slabs? What would be the average cost (Atlanta suburbs) of replacing a 10X20 slab? Thanks.