Existing Conditions. Contours at an interval of one foot for ground slopes less than five percent, two-foot contour intervals for ground slopes between five percent and 10%, five-foot contour intervals for ground slopes exceeding 10%, location and direction of all watercourses; natural features, such as rock outcropping, marshes, wood areas, etc.; location and names of all existing or prior platted streets or other public ways, railroad and utility rights-of-way, parks and other public open spaces, permanent buildings and structures and their uses, permanent easements and City boundaries within 500 feet of the development; existing sewers, water mains, culverts and other underground facilities within the development, indicating pipe sizes, grades, manholes and their exact location; and the land ownership.