Topographic Base Map. The topographic base map for the site being developed shall extend a minimum of 200 feet beyond the limits of the proposed development, at a scale of one inch equals 100 feet or greater, showing two-foot contour intervals. Upstream tributary drainage information shall be required when deemed necessary by the reviewing engineer. The topographic base map shall include existing surface water drainage, shorelines, steep slopes, soils, erodible soils, perennial or intermittent streams that drain into or upstream of the Category One waters, wetlands and flood plains along with their appropriate buffer strips, marshlands and other wetlands, pervious or vegetative surfaces, existing man-made structures, roads, bearing and distances of property lines, and significant natural and manmade features not otherwise shown.