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ZONINO REGULATIONS I 7S-1U8 local soil and water conservation districts and the United States Soil Conservation Service. (6) Fill or excavated material must not be placed in a manner that creates an unsta ble slope. (7) Flans to place fill or excavated material on steep slopes must be reviewed by the city engineer for continued slope stability and must not create firdshed slopes of 30 percent or greater. (8) Fill or excavated material must not be placed in bluff impact zones. (9) Any alterations below the ordinary high water level of public waters must first be authorized by the commissioner of the department of natural resources under Minn. SUt. { 103G.245. (10) Alterations of topography must only be allowed if they are accessory to permitted or conditional uses and do not adversely affect adjacent or nearby property. (11) Placement of natural rock riprap, includ ing associated grading of ^e shoreline and placement of a filter blanket, is per mitted if the finished slope does not ex ceed three ftet horizontal to one fbot ver tical, the landward extent of tho riprap is within ten feet of the ordinary high water level, and the height of the riprap above the ordinary high water level does not exceed three feet. A riprap permit shall be obtained per the requirements of section 78-969. (ff Excavations where the intended purpose is connection to a public water, such as boat slips, canals, lagootu and harbors, are prohibited above the ordinary high water level. Such excavations below the elevation or the ordinary high water level are subject to approval of the department of natural resources and other agencies with concur rent jurisdiction. (Ord. No. 101 2nd series, 9 1(10.5€(16XJ)), 2-24- 1992; Ord. No. 127 2nd series,« 8,7-11-1994; Ord. No. 163 2nd series, { 3, 12-&1997; Ord. No. 171 2nd series, i 2, 4-4-1998) Sec. 78-1287. Stormwater management The following general and specific standards shall apply in addition to those standards found in article VIII of this chapter and section 82-222: (1) 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. (2) A development must be plaimed and con ducted in a nanner that will minimize the extent of disturbed areas, runoff velocities and erosion potential, and reduce and delay runoff volumes. Disturbed areas must be stabilized and protected as soon as possible and faculties or methods used to retain sediment on the site. (3) When development density, topographic features, and soil and vegetation condi tions are not sufficient to adequately han dle stormwater runoff using natural fea tures and vegetation, various types of constructed facilities, such as diversions, settlmg basins, skimming devices, dikes, waterways and ponds may be used. Pref erence must be given to designs using surface drainage, vegetation, and infiltra tion rather than buried pipes and manmade materials and facilities. (4) When constructed facilities are used to perform water management, documenta tion must be provided by a registered professional ci^ engineer that they are designed and installed consistent with the field office technical guide of the local soil and water conservation district. (6) New constructed stormwater outfalls to public waters must provide for filtering or settling of suspended solids and skim ming of surface debris before discharge. (Ord. No. 101 2nd series, $ l(10.56a6KK)), 2-24- 1992) Sec. 78-1288. Hard cover limitations. (a) No hard cover or impervious surface shall be placed, located or constructed within 75 foet of the ordinary high water level of any lake or tributary, except for stairways, lifts, landings and lockboxes as regulated elsewhere in this Code. Supp. No. 1 CD78;193