We will be installing a concrete garage floor and I have a couple of questions (Binghamton, NY): 1. We compacted the soil within the foundation in Aug 1998. We filled it with surrounding soil (some of it is red clay) and compacted every 6". Any way to assure it won't settle? It doesn't appear to have settled so far. (I assume wetting it will just cause a mess) 2. What is the minimum standard flooring components: 6" gravel; 6" thick slab with reinf. mesh; 4000 psi 3. Will putting plastic between gravel and concrete eliminate swetting of the concrete?