Simple addition of a pole barn and running plumbing to a half bath. I want to do it to code but it's virtually impossible to find out some of the specifics. Questions I have are pretty simple, how deep does the sewer line need to be under the slab and how deep does the water line need to be? I've found everything from dropping the sewer down to 30" outside of bldg to needing to be at least 36" the entire way. Along with the water line being 30" to 42". In southern indiana. Any help would be appreciated.