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DRAFT Revised July 7, 1998 be placed within bluff and shore impact zones, when other reasonable and feasible placement alternatives exist. If no alternatives exist, they may be placed within these areas, and must be designed to minimize adverse impacts. 5.43 Public and private watercraft access ramps, approach roads, and access - related parking areas may be placed within shore impact zones provided the vegetative screening and erosion control conditions of this subpart are met. For private facilities, the grading and filling provisions of Section 5.32 of this ordinance must be met. 5.5 Stormwater Management. The following general and specific standards shall apply: 5.51 General Standards: A. When possible, existing natural drainageways, wetlands, and vegetated soil surfaces must be used to convey, store, filter, and retain stormwater runoff before discharge to public waters. B. Development must 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 must be stabilized and protected as soon as possible and facilities or methods used to retain sediment on the site. C. When development density, topographic features, and soil and vegetation conditions are not sufficient to adequately handle stormwater 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 must be given to designs using surface drainage, vegetation, and infiltration rather than buried pipes and man -made materials and facilities. 5.52 Specific Standards: A. Impervious surface coverage of lots must not exceed 25 percent of the lot area. B. When constructed facilities are used for stormwater management. documentation must be provided by a qualified individual that they are designed and installed consistent with the'field office technical guide of the local soil and water conservation districts. C. New constructed stormwater outfalls to public waters must provide for filtering or settling of suspended solids and skimming of surface debris before discharge. 5.6 Special Provisions for Commercial, Industrial, Public /Semipublic, Agricultural, Forestry and Extractive Uses and Mining of Metallic Minerals and Peat. 5.61 Standards for Commercial. Industrial, Public, and Semipublic Uses. A. Surface water- oriented commercial uses and industrial, public, or semipublic uses with similar needs to have access to and use of public waters may be located on parcels or lots with frontage on public sMO- 260.081 -29- 260 -081 -10