04 - Staff Report - Conditional Use Permit Wilderness Resort Villas

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c. Open space must include areas with physical characteristics unsuitable for development in their natural state and areas containing significant historic sites or unplatted cemeteries. d. Open space may include outdoor recreational facilities for use by owners of dwelling units or sites, by guests staying in commercial dwelling units or sites and by the general public; e. Open space may include subsurface sewage treatment systems if the use of the space is restricted to avoid adverse impacts on the systems; f. Open space must not include commercial facilities or uses; g. The appearance of open space areas including topography, vegetation and allowable uses, must be preserved by use of restrictive deed covenants, permanent easements,public dedication and acceptance or equally effective and permanent means; h. The shore impact zone,based on normal structure setbacks, must be included as open space. For residential PUDs at least fifty percent(50%) of the shore impact zone area of existing developments or at least seventy percent(70%) of the shore impact zone area of new developments must be preserved in its natural or existing state. For commercial PUDs, at least fifty percent(50%) of the shore impact zone must be preserved in its natural state. E. Erosion Control and Stormwater Management. Erosion control and stormwater management plans must be developed and the PUD must: a. Be designed and the construction managed to minimize the likelihood of serious erosion occurring either during or after construction. This must 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 must be used to minimize erosion impact on surface water features. Erosion control plans approved by the Crow Wing County Soil and Water Conservation District may be required if project size and/or site physical characteristics warrant; and b. Be designed and constructed to effectively manage reasonably expected quantities and qualities of stormwater runoff. Impervious surface coverage within any tier must not exceed twenty-five percent(25%)of the tier area,except that for commercial PUDs,thirty-five percent(35%) impervious surface coverage may be allowed in the first tier of general development lakes with an approved stormwater management plan consistent with Section 25.150. F. Centralization and Design of Facilities. Centralization and design of facilities and structures must be done according to the following standards: a. Planned Unit Developments must be connected to publicly owned water supply and sewer systems, if available. On-site water supply and sewage February Staff Report Page 10