I have been asked to build an infield for a church that we do work for. The questions that I have are what kind of material to use for the baselines. I have been told to use limestone screenings. We are planning on excavating 6" of topsoil and replacing with the limestone screenings. Is this deep enough for proper drainage? The church doesn't want to put a ton of money into it because it will be mainly for a practice field and not a playing field, but they do want to do it correctly. Any help would be appreciated.