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4) the association shall be responsible for insurance, taxes, and maintenance of all commonly owned property and facilities, 18.085.74 Open Space Requirements. Planned unit developments within shorcland districts shall contain open space meeting all of the following criteria: 1) at least SO percent of the total project area shall be preserved as open space. (dwelling units or sites, road rights-of-way, or land covered by road surfaces, parking areas, or structures, except water-oriented accessory structures or facilities, are developed areas and shall not be included in the computation of minimum open space); 2) open space shall include areas with physical characteristics unsuitable for development in their natural state, and areas containing significant historic sites or unplatted cemeteries; 3) open space may include outdoor recreational facilities for use by owners of dwelling units or sites, by guests staying in commerical dwelJing units or sites, and by the general public; 4\ nn",n '!n~{'t:> <:!h!:111 nnt tnt':hl/'"1t:> {'.nmm",rt':¡~l f~t':mt¡PQ nr IlQPQ hilt m~\7 ('.nnt~in ul~t",r_nr1P11tprI I) vt""'...... 11.;1'1"'...........- 'I.JI"'&~"'.L ............" ..............._.....w _.........&.a-.........._.._.......... ...._~..+...................... ........ .............-.....,. .....-.. .........-J __........_+...... ...T_....____ -......-............-- 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 POOlS, 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 POOlS, 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 stormwater runoff. Impervious surface coverage within any lot shall not exceed 25 percent of the tier area, except that for commercial POO's 35 percent impervious surface coverage may be allowed in the first tier of general development lakes with an approved stormwater management plan and consistency with Section 18. 18.085.76 Centralization and Design of Facilities. Centralization and design offaciIities and structures shall be done according to the folIowing standards: 22