Agenda - Planning Commission - 04/27/2023

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1 10. Alterations of topography must only be allowed if they are accessory to permitted or 2 conditional uses and do not adversely affect adjacent or nearby properties; and 3 11. Placement of natural rock rip-rap, including associated grading of the shoreline and 4 placement of a filter blanket, is permitted if the finished slope does not exceed three feet 5 horizontal to one foot vertical,the landward extent of the rip-rap is within ten feet of the 6 ordinary high water level, and the height of the rip-rap above the ordinary high water 7 level does not exceed three feet. 8 e. Connections to public waters. Excavations where the intended purpose is connection to a 9 public water, such as boat slips, canals, lagoons, and harbors, must be controlled by local 10 shoreland controls. Permission for excavations may be given only after the commissioner has 11 approved the proposed connection to public waters. 12 (3) Placement and design of roads, driveways, and parking areas. 13 a. Public and private roads and parking areas must be designed to take advantage of natural 14 vegetation and topography to achieve maximum screening from view from public waters. 15 Documentation must be provided by a qualified individual that all roads and parking areas are 16 designed and constructed to minimize and control erosion to public waters consistent with 17 the field office technical guides of the local soil and water conservation district, or other 18 applicable technical materials. 19 b. Roads, driveways, and parking areas must meet structure setbacks and must not be placed 20 within bluff and shore impact zones, when other reasonable and feasible placement 21 alternatives exist. If no alternatives exist,they may be placed within these areas, and must be 22 designed to minimize adverse impacts. 23 c. Public and private watercraft access ramps, approach roads, and access-related parking areas 24 may be placed within shore impact zones provided the vegetative screening and erosion 25 control conditions of this section are met. For private facilities, the grading and filling 26 provisions of subsection (g)(2) of this section must be met. 27 (4) Stormwater management. The following general and specific standards shall apply: 28 a. General standards: 29 1. When possible,existing natural drainageways,wetlands,and vegetated soil surfaces must 30 be used to convey, store, filter, and retain stormwater runoff before discharge to public 31 waters. 32 2. Development must be planned and conducted in a manner that will minimize the extent 33 of disturbed areas, runoff velocities, erosion potential, and reduce and delay runoff 34 volumes. Disturbed areas must be stabilized and protected as soon as possible and 35 facilities or methods used to retain sediment on the site. 36 3. When development density,topographic features,and soil and vegetation conditions are 37 not sufficient to adequately handle stormwater runoff using natural features and 38 vegetation, various types of constructed facilities such as diversions, settling basins, 39 skimming devices, dikes, waterways, and ponds may be used. Preference must be given 40 to designs using surface drainage, vegetation, and infiltration rather than buried pipes 41 and manmade materials and facilities. 42 b. Specific standards: 43 1. Impervious surface coverage of lots must not exceed 25 percent of the lot area. 44 2. When constructed facilities are used for stormwater management, documentation must 45 be provided by a qualified individual that they are designed and installed consistent with 46 the field office technical guide of the local soil and water conservation districts. 47 3. New constructed stormwater outfalls to public waters must provide for filtering or 48 settling of suspended solids and skimming of surface debris before discharge. Page 129 of 147