Last month we considered some aspects of landscaping and planting around soil treatment areas. This month we take a little closer look at planting and landscaping guidelines for onsite systems.If you’re establishing ground cover, topsoil should be added to a minimum of a 6-inch depth. Keep in mind applying more than the 6 inches, in effect, buries the system just that much deeper below the surface, working against the principle of keeping systems shallow for good water and oxygen exchange.So while you may need to apply more soil to smooth contours and make the system fit in, add no more
