Except for lots established under the open space design option provisions of Part 9, where any lot is served by an individual on-site sewage system, a contiguous net lot area of at least 30,000 square feet shall be provided which shall not be divided completely by any of the following areas:
(1)
Any permanent right-of-way or easement for a public or private street.
(2)
Any area within the Flood Hazard District as established in § 27-1501.
(3)
Any area comprising wetlands under the jurisdiction of the U.S. Army Corps of Engineers or the Pennsylvania Department of Environmental Protection.