Building Lifetime 8X10 shed on slightly below ground
I'm planning to build a Lifetime 8x10 shed tomorrow and just noticed that the concrete foundation is not completely above ground. It's an old foundation and I just removed the old shed that was on it. The foundation is still good to use as it is. On two sides of the foundation, the top of the concrete is above the ground but on the other two sides (long and short side) it's about 3 inches below the ground. I have my brother-in-law and father-in-law coming tomorrow morning to help me build it. What can I do to properly seal the shed from water? I'm thinking of using a thick plastic for underneath the base of the shed and another liner on the outside of the wall to the ground and then add gravel sloped away from the shed. Also, I'm thinking of adding caulking on the outside.
Any advice would be much appreciated.