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(7) Plans to place fill or excavated material on steep slopes must be reviewed by the city engineer <br /> for continued slope stability and must not create finished slopes of 30 percent or greater. <br /> (8) Fill or excavated material must not be placed in bluff impact zones. <br /> (9) Any alterations below the ordinary high water level of public waters must first be authorized by <br /> the commissioner of the department of natural resources under Minn. Stat. § 103G.245. <br /> (10) Alterations of topography must only be allowed if they are accessory to permitted or conditional <br /> uses and do not adversely affect adjacent or nearby property. <br /> (11) Placement of natural rock riprap, including associated grading of the shoreline and placement of <br /> a filter blanket, is permitted if the finished slope does not exceed three feet horizontal to one foot <br /> vertical, the landward extent of the riprap is within ten feet of the ordinary high water level, and <br /> the height of the riprap above the ordinary high water level does not exceed three feet. A riprap <br /> permit shall be obtained per the requirements of section 78-969. <br /> (f) Excavations where the intended purpose is connection to a public water, such as boat slips, canals, <br /> lagoons and harbors, are prohibited above the ordinary high water level. Such excavations below the <br /> elevation or the ordinary high water level are subject to approval of the department of natural resources <br /> and other agencies with concurrent jurisdiction. <br /> (Ord. No. 101 2nd series, § 1(10.56(16)(J)), 2-24-1992; Ord. No. 127 2nd series, § 8, 7-11-1994; <br /> Ord. No. 163 2nd series, § 3, 12-8-1997; Ord. No. 171 2nd series, § 2, 4-4-1998; Ord. No. 28 3rd <br /> series, § 17, 8-22-2005; Ord. No. 133 3rd series, §§ 2, 3, 1-26-2015) <br /> Sec. 78-1287. -Stormwater management. <br /> The following general and specific standards shall apply in addition to those standards found in article <br /> VIII of this chapter and section 82-222: <br /> (1) When possible, existing natural drainageways, wetlands and vegetated soil surfaces must be <br /> used to convey, store, filter and retain stormwater runoff before discharge to public waters. <br /> (2) A development must be planned and conducted in a manner that will minimize the extent of <br /> disturbed areas, runoff velocities and erosion potential, and reduce and delay runoff volumes. <br /> Disturbed areas must be stabilized and protected as soon as possible and facilities or methods <br /> used to retain sediment on the site. <br /> (3) When development density, topographic features, and soil and vegetation conditions are not <br /> sufficient to adequately handle stormwater runoff using natural features and vegetation, various <br /> types of constructed facilities, such as diversions, settling basins, skimming devices, dikes, <br /> waterways and ponds may be used. Preference must be given to designs using surface drainage, <br /> vegetation, and infiltration rather than buried pipes and manmade materials and facilities. <br /> (4) When constructed facilities are used to perform water management, documentation must be <br /> provided by a registered professional civil engineer that they are designed and installed consistent <br /> with the field office technical guide of the local soil and water conservation district. <br /> (5) New constructed stormwater outfalls to public waters must provide for filtering or settling of <br /> suspended solids and skimming of surface debris before discharge. <br /> (Ord. No. 101 2nd series, § 1(10.56(16)(K)), 2-24-1992) <br /> Sec. 78-1288. - Hardcover limitations. <br /> Hardcover on all lots within the shoreland overlay district shall comply with the requirements of Article <br /> XIII: Stormwater Quality Overlay District. <br /> (Ord. No. 94 3rd series, § 6, 9-24-2012) <br /> Page 9 <br />