All portions of the tract not utilized by buildings or paved surfaces shall be landscaped utilizing combinations such as landscaped fencing, shrubbery, lawn area, ground cover, rock formations, contours, existing foliage, and the planting of conifers and/or deciduous trees native to the area in order to either maintain or reestablish the tone of the vegetation in the area and lessen the visual impact of the structures and paved areas. The established grades on any site shall be planned for both aesthetic and drainage purposes. The grading plan, drainage facilities and landscaping shall be coordinated to prevent erosion and silting as well as assuring that the capacity of any natural or man-made drainage system is sufficient to handle the water generated and anticipated both from the site and contributing upstream areas.