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1016.26: STORM WATER MANAGEMENT: The following general and specific standards shall apply to all developments within the city: A. General Standards: 1. Existing Natural Drainageways: When possible, existing natural drainageways, and vegetated soil surfaces shall be used to convey, store, filter, and retain storm water runoff before discharge to public waters. 2. Minimum Disturbance: Development shall be planned and conducted in a manner that will minimize the extent of disturbed areas, runoff velocities, erosion potential, and reduce and delay runoff volumes. Disturbed areas shall be stabilized and protected as soon as possible and facilities or methods used to retain sediment on the site. 3. Constructed Facilities: When development density, topographic features, and soil and vegetation conditions are not sufficient to adequately handle storm water runoff using natural features and vegetation, various types of constructed facilities such as diversions, settling basins, skimming devices, dikes, waterways, and ponds may be used. Preference shall be given to designs using surface drainage, vegetation, and infiltration rather than buried pipes and manmade materials and facilities. B. Specific Standards: 1. Impervious Surface Coverage: Impervious surface coverage of a site shall not exceed twenty five percent (25%) of the site area in a shoreland or wetland overlay district unless storm water is conveyed to an approved, on-site or regional storm water ponding/retention facility designed to accommodate the increased runoff prior to discharge from the site into public waters or wetlands. 2. Review by City Engineer: All proposed storm water facilities shall be reviewed by the city engineer and certified for compliance with the city's surface water management plan, National Urban Runoff Program (NURP) standards, the Minnesota Pollution Control Agency's (MPCA) Urban Best Management Practices, and any established standards of the water management organization having jurisdiction in the project area. 3. Commercial, Industrial, and Residential Development Affectation: All commercial and industrial developments and redevelopments affecting more than five (5) acres of land and all residential developments affecting more than five (5) acres of land shall: a. Be served by storm water ponding facilities, on- or off-site, designed to remove a minimum of ninety percent (90%) of total suspended solids resulting from the runoff from a one inch (I") rainfall event, and b. Within the development, provide for settling chambers, sumps, dry ponds or other devices to provide for the filtering or settling of fine sands prior to discharge into the city's storm water system. 4. Private Storm Water Facilities: All private storm water facilities shall be maintained in proper condition consistent with the performance standards for which they were originally designed. All settled materials from ponds, sumps, grit chambers, and other devices, including settled solids, shall be removed and properly disposed of on a five (5) year interval. One to five (5) year waivers from this requirement may be granted by the city engineer when the owner presents evidence that the facility has additional capacity to remove settled solids in accordance with the original design capacity. 5. Inventory of Private Storm Water Facilities: Upon adoption of this chapter, the city engineer shall inventory and maintain a data basis for all private storm water facilities requiring maintenance to assure compliance with this section. (Ord. 1239, 4-24-2000) 1016.27: AMENDMENT: This chapter may be amended whenever the public necessity and the general welfare require such amendment by following the procedure specified in this section. A. Request For Amendment: Requests for amendment of this chapter shall be initiated by a petition of the owner or owners of the actual property, a recommendation of the planning commission or by action of the City Council. B. Application: An application for an amendment shall be filed with the zoning administrator. All applications for changes in the boundaries of the zoning district which are initiated by the petition of the owner or owners