Density. The density of an RCD shall not be greater than eight dwelling units per contiguous acre of upland soils. In determining the potential density, the Planning Board may consider such other limitations on development that may exist on the property, including, but not limited to, aquifer and wellhead protection areas, steep slopes, ledge (exposed and shallow), soil types, and legal impediments to development (rights-of-way, easement restrictions, restrictive covenants, etc.). No single contiguous area of uplands on a parcel shall have a density greater than eight dwelling units per acre. The density is the maximum allowed, and it may be reduced by the Planning Board if the characteristics of the site, or the configuration of the site plan, or the relationship of the RCD to its environs so warrants.