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developments shall be preserved in their natural • or existing state . f. Open space shall not include Commercial facilities or uses, but may contain water-oriented accessory structures or facilities . g. The appearance of open space areas including topography, vegetation, and allowable uses, shall be preserved by use of restrictive deed covenants, permanent easements, public dedication and acceptance, or other equally effective and permanent means . h. Open space may include subsurface sewage treatment systems if the use of the space is restricted to avoid adverse impacts on the systems. iii. Centralization and design of facilities and structures shall be done according to the following standards. a. Residential planned unit developments shall • be connected to publicly owned water supply and sewer systems, if available . On-site water supply and sewage treatment systems shall be centralized and designed and installed to meet or exceed applicable standards or rules of the Minnesota Department of Health and Sections 904 .08 (2) and 904 .08 (8) . On-site sewage treatment systems shall be located on the most suitable areas of the development, and sufficient lawn area free of limiting factors shall be provided for a replacement soil treatment system for each sewage system. b. Dwelling units or sites shall be clustered into one or.more groups and located on suitable areas of the development. They shall be designed and located to meet or exceed the following dimensional standards for the relevant shoreland classification: setback from the ordinary high water level, elevation above the surface water features, and maximum height. Setbacks from the ordinary high water level shall be increased for developments with density increases . Maximum • density increases may only be allowed if structure setbacks from the ordinary high water level are 9.216