A preliminary topographic survey, showing ground contours adjacent
to and within the tract to be subdivided, at intervals of not more
than 10 feet of elevation, and all pertinent topographic and planimetric
features within and adjoining the tract, including existing streets,
existing buildings, watercourses and their 100-year flood limits,
water bodies, existing gas wells, wetlands, wooded areas, known sensitive
archaeological areas and known landfill and hazardous disposal areas,
based upon known public information. Features to be retained in the
subdivision should be so indicated.