Sketch map. A sketch map is required with all applications for one- or two-family dwellings or their customary accessory uses. The sketch map shall be drawn to scale and shall show as applicable: the dimensions and location of the lot, exact size and location of all existing and proposed buildings on the lot, proposed location of water and sewage disposal systems, parking areas and driveway location, natural watercourses, ponds, surface drainage patterns and location of existing or drainage patterns and location of existing or proposed easements.