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38 Revised 10/03/2019 Ordinance Language Commentary B. Stormwater management facilities must be designed and constructed to manage expected quantities and qualities of stormwater runoff. (1)For residential PUDs, impervious surface for the entire project site must not exceed 25%. (2) For commercial PUDs, impervious surfaces within any tier must not exceed 25 percent of the tier area, except that 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 8.0 of this ordinance. 10.7 Conversions. Local governments may allow existing resorts or other land uses and facilities to be converted to residential PUDs if all of the following standards are met: 10.71 Proposed conversions must be evaluated using the same procedures for residential PUDs involving new construction. Inconsistencies between existing features of the development and these standards must be identified; 10.72 Deficiencies involving water supply and sewage treatment, structure color, impervious coverage, open space, and shore recreation facilities must be corrected as part of the conversion or as specified in the conditional use permit; 10.73 Shore and bluff impact zone deficiencies must be evaluated and reasonable improvements made as part of the conversion. These improvements must include, where applicable, the following: A. Removal of extraneous buildings, docks, or other facilities that no longer need to be located in shore or bluff impact zones; B. Remedial measures to correct erosion, improve vegetative cover and improve screening of buildings and other facilities as viewed from the water; and C. Conditions attached to existing dwelling units located in shore or bluff impact zones that preclude exterior expansions in any dimension or substantial alterations. The conditions must also provide for future relocation of dwelling units, where feasible, to other locations, meeting all setback and elevation requirements when they are rebuilt or replaced. 10.74 Existing dwelling unit or dwelling site densities that exceed standards in Section 10.5 of this ordinance may be allowed to continue but must not be allowed to be increased, either at the time of conversion or in the future. Efforts must be made during the conversion to limit impacts of high densities by requiring seasonal use, improving vegetative screening, centralizing shore recreation facilities, installing new sewage treatment systems, or other means. 10.64.B.(1) Optional higher standard to ensure that the impervious surface for the entire development does not exceed 25% 10.64.B.(2) Optional deletion. Local governments may choose to require a 25% impervious surface limit in all tiers for commercial PUDs by deleting the provisions that allows a 35% impervious surface limit. This spreads out the impervious surface and limits it in near shore areas thus preserving habitat and shoreland aesthetics.