(A) Minimum size. A planned unit development shall contain a minimum of three units or sites.
(B) Buffer. A 50-foot vegetative buffer will be maintained or established along the boundary of the PUD. There shall be no units or impervious coverage within this buffer, with the exception of access roads or utilities. The buffer will serve to screen the adjacent parcels and the lake, where applicable, from the units within the PUD. The screening will contain both low growing (e.g., brush) and high growing (e.g., trees) vegetation. Adjacent parcels and the lake, where applicable, shall be a minimum of 50% screened, as measured by the Planning and Zoning Administrator, from the adjacent parcel or the lake during leaf-on conditions. An earthen berm may be used where, in the opinion of the Planning Commission, the existing vegetation cannot be enhanced to meet the 50% screening criteria. Use of a berm shall not preclude the maintaining of a 50-foot buffer or the installation of screening as part of the berm.
(C) Open space. At least 25% of the total project area must be preserved in open space.
(1) Open space shall be left in its natural state and shall be contiguous.
(2) Dwelling units or sites, road right-of-way, land covered by road surfaces, parking areas, stormwater basins, collection and treatment areas, structures, and landscaped areas which are routinely maintained are developed areas and shall not be included in the computation of minimum open space.
(3) Areas with physical characteristics unsuitable for development in their natural state, and areas containing significant historic sites or unplatted cemeteries shall be included as open space.
(4) The 50-foot buffer shall be included as open space, minus areas used as accesses.
(5) Where a wildlife corridor is present, open space shall be designed to include the corridor.
(6) The appearance of open space areas shall be preserved by use of restrictive deed covenants, permanent easements, public dedication and acceptance, or other equally effective and permanent means acceptable to the city.
(7) At least 50% of the shore impact zone must be maintained as open space.
(D) Common space. At least 50% of the project must be included as common space.
(1) Open space shall be counted as common space.
(2) Common space may include any outdoor recreational facilities for use by owners of the dwelling units or sites, or the public.
(3) Common space may include areas used for stormwater retention or management and areas used for sanitary sewer collection or disposal. Where common space includes sanitary sewage treatment systems, the use of the space shall be restricted where necessary to avoid adverse impacts on the systems.
(4) All of the shore impact zones must be included as common space.
(5) Common space must not include commercial facilities or uses, but may contain water-oriented facilities.
(6) The appearance and use of common space areas, including topography, vegetation, and allowable uses, must be preserved by use of restrictive deed covenants, permanent easements, public dedication and acceptance, or other equally effective and permanent means acceptable to the city.
(E) Stormwater management.
(1) All PUDs must develop and maintain a stormwater management plan indefinitely.
(2) Capacities of existing drainage ways shall be maintained.
(3) Unless specifically allowed by the city, inlets and outlets to adjacent parcels shall be maintained. Flows from outlets shall be maintained unless allowed by the city.
(4) All PUDs shall contain the ten-year, 24-hour storm event within the development.
(5) Runoff from the parcel shall not be concentrated unless part of a city stormwater management plan.
(F) Sanitary sewer and water supply standards.
(1) Residential planned unit developments must be connected to publicly owned water supply and sewer systems, when available.
(2) Onsite water supply and sewage treatment systems must be centralized and designed and installed to meet or exceed applicable standards or rules of the State Department of Health and the State Pollution Control Agency.
(3) Onsite sewage treatment systems must be located in a suitable area of the development, and sufficient lawn area free of limiting factors must be provided for a replacement soil treatment system for each sewage system.
(G) Erosion control.
(1) All PUDs must develop and maintain an erosion control plan throughout construction activities.
(2) Temporary ground covers, sediment entrapment facilities, vegetated buffer strips, or other techniques must be used to minimize erosion.
(3) Steps shall be taken to insure that disturbed ground is restored or stabilized as soon as possible after being disturbed.
(H) Exterior lighting. All exterior lighting shall be directed downward. Lighting shall not illuminate parcels adjacent to the PUD, either directly or indirectly.
(I) Building standards. Units must be clustered in one or more groups and located on suitable areas of the development. All structures within a PUD must meet the minimum standards.
(1) New multi-family dwellings of four units or larger shall be designed by an architect.
(2) New multi-family buildings shall meet the State Code for fire and sound ratings.
(3) Water systems must be winterized.
(4) Parking and driving areas must be paved.
(5) All buildings shall be earth tone in color and shall be designed, constructed, and positioned to be compatible, in color, character, and mass with the surrounding land use.
(Ord. passed 4-10-2017) Penalty, see § 150.999