A topographic survey showing ground contours for the parcels and parcels adjacent to and within 200 feet of the project at intervals of not more than five feet of elevation, and all pertinent topographic and planimetric features within the site and the adjoining tract, including existing buildings, watercourses and their one-hundred-year flood limits, water bodies, swamps, wooded areas and individual large trees. Features to be retained in the project should be so indicated. If the proposal is not to be served by a public sanitary sewer system, then the topographic survey shall be provided as above except at not more than two feet of elevation, and perk test results, administered by the County Health Department, and the layout of the proposed sewage system indicated shall be provided.