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h. The shore impact zone, based on no al structure setbacks, must be <br />included as open space. For residential PUDs, at least fifty (50) <br />percent of the shore impact zone area of existing developments or at <br />least seventy (70) percent of the shore impact zone area of new <br />developments must be preserved in its natural existing state. For <br />commercial PUDs, at Least fifty (50) percent of the shore impact zone <br />must be preserved in its natural state. <br />3. Erosion Control and Stoun Water Management. Erosion control, storm water <br />management plans, and Best Management Practices must be developed and <br />the PUD must: <br />a. Be designed, and the construction managed, to minimize the <br />likelihood of serious erosion occurring either during or after <br />construction. This must be accomplished by limiting the amount and <br />length of time of bare ground exposure. Temporary ground covers, <br />sediment entrapment facilities, vegetated buffer strips, or other <br />appropriate techniques must be used to minimize erosion impacts on <br />surface water features. Erosion control plans approved by a soil and <br />water conservation district may be required if project size and site <br />physical characteristic warrant; and <br />b. Be designed and constructed to effectively manage reasonably <br />expected quantities and qualities of storm water runoff. Impervious <br />surface coverage within any tier must not exceed twenty -five (25) <br />percent of the tier area, except that for commercial PUDs thirty -five <br />(35) percent impervious surface coverage may be allowed in the first <br />tier of general development lakes with an approved storm water <br />management plan and consistency with Section 917.030 of this <br />Ordinance. <br />4. Centralization and Design of Facilities. Centralization and design of facilities <br />and structures must be done according to the following standards: <br />a. Planned unit developments must be connected to publicly owned <br />water supply and sewer systems. <br />b. Dwelling units or sites must be clustered into one or more groups and <br />located on suitable areas of the development. They must be designed <br />and located to meet or exceed the following dimensional standards <br />for the relevant shoreland classification: setback from the ordinary <br />high water level, above the surface water features, and <br />917 -18 <br />- 3 1 - <br />