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1. For lakes, ponds, and flowages, by (a) an elevation of available flood . information and consistent with "Statewide Standards and Criteria for Management of Flood Plain Areas of Minnesota," or (b) placing the lowest floor at a level at least three (3) feet above the highest known water level. In those instances where sufficient data on known high water levels are not available, the ordinary high water mark shall be used. 2. For streams, by an evaluation of available flood information and consistent with "Statewide Standards and Criteria for Management of Flood Plain Areas of Minnesota" Subd. 5. Exceptions to Structure Setback Requirements A. Boathouses, Piers, Docks. Setback requirements from the ordinary high water mark shall not apply to boathouses, piers, and docks. Location of piers and docks shall be controlled by applicable State and local regulations. Boathouses may be allowed as a special use provided they are not used for habitation and do not contain sanitary facilities. B. Adjacent Lots. On undeveloped shoreland lots that have two (2) adjacent lots with existing principal structures on both such adjacent lots, any new residential structure may be set back the average setback of the adjacent structures from the ordinary high water mark or fifty (50) feet, whichever is greater, provided all other provisions of the shoreland management districts are complied with. Subd. 6. On-site Sewage Treatment Systems. All permitted uses and special uses within the shoreland management districts shall be served with public sewer. No private on-site sewage treatment systems shall be permitted. • Subd. 7. Shoreland Alterations. A. Removal of Natural Vegetation. The removal of natural vegetation shall be restricted to prevent erosion into protected waters, to consume nutrients in the soil, and to preserve shoreland aesthetics. Removal of natural vegetation in the shoreland management districts shall be subject to the following provisions: Selective removal of natural vegetation shall be allowed, provided that sufficient vegetative cover remains to screen cars, dwellings and other structures when viewed from the water. 2. Clear -cutting of natural vegetation shall be prohibited 3. Natural vegetation shall be restored insofar as feasible after any construction project is completed to retard surface runoff and soil erosion. B. Grading and Filling. Grading and filling in shoreland management districts or any alteration of the natural topography where the slope of the land is toward a protected water or watercourse leading to a protected water shall only be authorized by a permit. If the amount of grading, excavation, or filling is less than four hundred (400) cubic yards per single parcel or four hundred (400) cubic yards per acre of land, whichever is greater, an administrative permit shall be required. If the amount of grading, excavation, or filling exceeds four hundred (400) cubic yards per acre of land, whichever is greater, a special use permit shall be required. Such permits shall be applied for and approved in accordance with this Code and the City of Arden Hills Zoning Ordinance. Any such permit may be granted subject to the conditions that: . 1. The smallest amount of bare ground shall be exposed for as short a time as feasible. Ordinance #334 Page 6