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fifty (50) percent of the shore impact zone <br />must be preserved in its natural state. <br />3. Erosion Control and Storm Water Management. <br />Erosion control, storm water management plans, and <br />Best Management Practices must be developed and the <br />PUD must: <br />a) Be designed, and the construction managed, to <br />minimize the likelihood of serious erosion <br />occurring either during or after construction. <br />This must be accomplished by limiting the <br />amount and length of time of bare ground <br />exposure. Temporary ground covers, sediment <br />entrapment facilities, vegetated buffer <br />strips, or other appropriate techniques must <br />be used to minimize erosion impacts on surface <br />water features. Erosion control plans <br />approved by a soil and water conservation <br />district may be required if project size and <br />site physical characteristic warrant; and <br />b) Be designed and constructed to effectively <br />manage reasonably expected quantities and <br />qualities of storm water runoff. Impervious <br />surface coverage within any tier must not <br />exceed twenty -five (25) percent of the tier <br />area, except that for commercial PUDS thirty - <br />five (35) percent impervious surface coverage <br />may be allowed in the first tier of general <br />development lakes with an approved storm water <br />management plan and consistency with Section <br />917.030 of this Ordinance. <br />4. Centralization and Design of Facilities. <br />Centralization and design of facilities and <br />structures must be done according to the following <br />standards: <br />a) Planned unit developments must be connected to <br />publicly owned water supply and sewer systems. <br />b) Dwelling units or sites must be clustered into <br />one or more groups and located on suitable <br />areas of the development. They must be <br />designed and located to meet or exceed the <br />following dimensional standards for the <br />relevant shoreland classification: setback <br />from the ordinary high water level, elevation <br />above the surface water features, and maximum <br />height. Setbacks from the ordinary high water <br />level must be increased in accordance with <br />47 <br />Page 74 <br />