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Third 200 <br /> Fourth 200 <br /> Fifth 200 <br /> (6) Allowable densities may be transferred from <br /> any tier to any other tier further from the shoreland lake or <br /> river, but must not be transferred to any other tier closer . <br /> B. The design criteria are: <br /> (1) Open space. Commercial planned unit <br /> developments must contain open space meeting all of the <br /> following criteria : <br /> (a) At least 50 percent of the total project <br /> area must be preserved as open space. <br /> (b) Dwelling units or sites, road <br /> rights-of-way, or land covered by road surfaces, or parking <br /> areas, except water-oriented accessory structures or facilities, <br /> are developed areas and should not be included in the <br /> • <br /> computation of open space. <br /> (c) Open space must include areas with <br /> physical characteristics unsuitable for development in their <br /> natural state, and areas containing significant historic sites <br /> or unplatted cemeteries . <br /> (d) All shore impact zones within commercial <br /> planned unit developments must be included as open space, and at <br /> least 50 percent of these areas must be preserved in their <br /> natural or existing state. <br /> (e) Open space may include outdoor <br /> recreation facilities for use by guests staying in dwelling <br /> units or sites, or the public. <br /> ( f ) Open space may include subsurface sewage <br /> treatment systems if use of the space is restricted to avoid <br /> adverse impacts on the systems . <br /> ( 2) Design of structures and facilities must be <br /> done according to the following standards: <br /> (a) Commercial planned unit developments <br /> must be connected to publicly owned water supply and sewer <br /> systems, if available . On-site water supply and sewage <br /> treatment systems must be designed and installed to meet or <br /> exceed applicable rules of the Minnesota Department of Health <br /> and the Minnesota Pollution Control Agency. On-site sewage <br /> treatment systems must be located on the most suitable areas of <br /> the development, and sufficient lawn area free of limiting <br /> factors must be provided for a replacement soil treatment system <br /> for each sewage system. <br /> A-1.45 <br />