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3) open space may include outdoor recreational facilities for use by owners of dwelling units or sites, by guests staying in commerical dwelling units or sites, and by the general public; 4) open space shall not include commercial facilities or uses, but may contain water-oriented accessory structures or facilities; 5) 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; and 6) the shore impact zone, based on normal structure setbacks, shall be included as open space. For residential PUD's, at least 50 percent of the shore impact zone area of existing developments or at least 70 percent of the shore impact zone area of new developments shall be preserved in a natural or existing vegetative state. For commercial PUD's, at least 50 percent of the shore impact zone shall be preserved in its natural state. 18.085.75 Erosion Control and Stormwater Management. Erosion control and stormwater management plans shall be developed and the PUD shall be: 1) designed, and the construction managed, to minimize the likelihood of serious erosion occurring either during or after construction. This shall be accomplished by limiting the amount and length of time of bare ground exposure. Temporary ground covers, sediment entrapment facilities, vegetated buffer strips, or other appropriate techniques shall be used to minimize erosion impacts on surface water features; and 2) designed and constructed to effectively manage reasonably expected quantities and qualities of storm water runoff. Impervious surface coverage within any lot shall not exceed 25 percent of the tier area, except that for commercial PUD's 35 percent impervious surface coverage may be allowed in the first tier of general development lakes with an approved storm water management plan and consistency with Section 18. 18.085.76 Centralization and Design of Facilities. Centralization and design of facilities and structures shall be done according to the following standards: 1) planned unit developments shall be connected to publicly owned water supply and sewer systems; 2) dwelling units or building sites shall be clustered into one or more groups and located on suitable areas of the site. 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 in accordance with Section 18.040.2 of this section for developments with density increases; 3) shore recreation facilities, including but not limited to swimming areas, docks, and watercraft mooring areas and launching ramps, shall be centralized and located in areas suitable for them. Evaluation of suitability shall include consideration of land slope, water depth, vegetation, soils, depth to groundwater and bedrock, or other relevant factors. The 22