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easements, public dedication and acceptance, or other equally effective and permanent means; and (8) the shore impact zone, based on normal structure setbacks, must be included as ooen snace. For residential POOlS. at least 50 nercent of the shore imnact zone -.r ,("0.-.. .., ... -. -;I" ----. ..--_.. - - I area of existing deve]op.ments or at least 70 percent of the shore impact zone area of new developments must be preserved in its natural or existing state. For commercial POO's, at least 50 percent of the shore impact zone must be preserved in its natural state. 7.72 Erosion Control and Stormwater Management. Erosion control and stormwater management plans must be developed and the PUD must: ( 1) 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 oftirne of bare ground exposure. Temporary ground covers, sediment entrapment facilities, vegetated buffer strips, or other appropriate techniques must be used to minimize erosion impacts on surface water features; and (2) be designed and constructed to effectively manage reasonably expected quantities and qualities of stormwater runoff. Impervious surface coverage within any tier must not exceed 25 percent of the tier area, except that for commercial PUD's 3S I'Iprl',p."t ;mnp.rvin11l:, ~lIrf!!('P. C".nvp.r!:lO'p. m!:lv hp. ~llnwp.ct in thp. fir~t tip.r of general r-- --... -'-'1"-- ..- -- --. .--- -- . -- -1;)- "'-J -- --.- .. -- on .--- _n -. ..-- -- f;;)_n_. n' development lakes with an approved stormwater management plan and consistency with Section 7.73 Centralization and Design of Facilities. Centralization and design of facilities and structures must be done according t¡, the following standards: (1) planned unit developments must be connected to publicly owned water supply and sewer systems; (2) dwemng units or sites must be clustered into one or more groups and located on suitable areas ofthe development. They must be designed and located to meet or exceed the following dimensional standards for the relevant shoreland classification: setback :trom the ordinary high water level, elevation above the surface water features, and maximum height. Setbacks from the ordinary high water level must be increased in accordance with Section of this ordinance for developments with density increases; (3) shore recreation facilities, including but not limited to swimming areas, docks, and watercraft mooring areas and launching ramps, must be centralized and located in areas suitable for them. Evaluation of suitability must include consideration of land slope, water depth, vegetation, soils, depth to groundwater and bedrock, or other relevant factors. The number of spaces provided for continuous beaching, . t..". I"'I\.'.L ~_ ____I __. J"'t__ ___,. _lt~____L'_ moonng, or aocKlng or watercran mus¡: no¡: exceeo one lor eacn auowauœ dwelling unit or site in the first tjer (notwithstanding existing mooring sites in an existing commercially used harbor). Launching ramp facilities, including a small DDS, 7/19/94 25