It is an 8" masonry construction for a general use basement (not finished). The drain pipe will tie into the current drain pipe around the existing house (I assume this drains to daylight somewhere, I do not have a sump system). Pipe will be at least 6" below the top of basement slab. Clay type soil. The drainage stone quoted for the job is 2-a modified but this could be changed ((says 2B in drawing - disregard). Really appreciate any comments, thanks.