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1 2. Be designed and constructed to effectively manage reasonably expected <br />2 quantities and qualities of stormwater runoff. Impervious surface coverage <br />3 within any tier must not exceed 25 percent of the tier area, except that for <br />4 commercial PUDs 35 percent impervious surface coverage may be allowed in the <br />5 first tier of general development lakes with an approved stormwater <br />6 management plan and consistency with this subdivision. <br />7 d. Centralization and design of facilities. Centralization and design of facilities and <br />8 structures must be done according to the following standards: <br />9 1. Planned unit developments must be connected to publicly owned water supply <br />10 and sewer systems, if available. On -site water supply and sewage treatment <br />11 systems must be centralized and designed and installed to meet or exceed <br />12 applicable standards or rules of the state department of health and this <br />13 subdivision. On -site sewage treatment systems must be located on the most <br />14 suitable areas of the development, and sufficient lawn area free of limiting factors <br />15 must be provided for a replacement soil treatment system for each sewage <br />16 syste m; <br />17 2. Dwelling units or sites must be clustered into one or more groups and located on <br />18 suitable areas of the development. They must be designed and located to meet <br />19 or exceed the following dimensional standards for the relevant shoreland <br />20 classification: setback from the ordinary high water level, elevation above the <br />21 surface water features, and maximum height. Setbacks from the ordinary high <br />22 water level must be increased in accordance with this subdivision for <br />23 developments with density increases; <br />24 3. Shore recreation facilities, including but not limited to swimming areas, docks, <br />25 and watercraft mooring areas and launching ramps, must be centralized and <br />26 located in areas suitable for them. Evaluation of suitability must include <br />27 consideration of land slope, water depth, vegetation, soils, depth to groundwater <br />28 and bedrock, or other relevant factors. The number of spaces provided for <br />29 continuous beaching, mooring, or docking of watercraft must not exceed one for <br />30 each allowable dwelling unit or site in the first tier (notwithstanding existing <br />31 mooring sites in an existing commercially used harbor). Launching ramp facilities, <br />32 including a small dock for loading and unloading equipment, may be provided for <br />33 use by occupants of dwelling units or sites located in other tiers; <br />34 4. Structures, parking areas, and other facilities must be treated to reduce visibility <br />35 as viewed from public waters and adjacent shorelands by vegetation, topography, <br />36 increased setbacks, color, or other means acceptable to the local unit of <br />37 government, assuming summer, leaf -on conditions. Vegetative and topographic <br />38 screening must be preserved, if existing, or may be required to be provided; <br />39 5. Accessory structures and facilities, except water oriented accessory structures, <br />40 must meet the required principal structure setback and must be centralized; and <br />41 6. Water -oriented accessory structures and facilities may be allowed if they meet or <br />42 exceed design standards contained in this subdivision and are centralized. <br />43 (5) Conversions. Local governments may allow existing resorts or other land uses and facilities to <br />44 be converted to residential planned unit developments if all of the following standards are <br />45 met: <br />46 a. Proposed conversions must be initially evaluated using the same procedures for <br />47 residential planned unit developments involving all new construction. Inconsistencies <br />48 between existing features of the development and these standards must be identified. <br />Page 148 of 160 <br />