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1 <br />2 <br />3 <br />4 <br />5 <br />6 <br />7 <br />8 <br />9 <br />10 <br />11 <br />12 <br />13 <br />14 <br />15 <br />16 <br />17 <br />18 <br />19 <br />20 <br />21 <br />22 <br />23 <br />24 <br />25 <br />26 <br />27 <br />28 <br />29 <br />30 <br />31 <br />32 <br />33 <br />34 <br />35 <br />36 <br />37 <br />38 <br />39 <br />40 <br />41 <br />42 <br />43 <br />44 <br />45 <br />46 <br />47 <br />48 <br />49 <br />permit <br />provided that: <br />1. If the project includes work at or below the OHWL, the commissioner has already <br />approved or permitted the project. <br />2. The structures are used only to correct an established erosion problem as determined <br />by the City of Ramsey. <br />3. The size and extent of the structures are the minimum necessary to correct the erosion <br />problem and are not larger than the following, unless a professional engineer <br />determines that a larger structure is needed to correct the erosion problem: <br />(i) Retaining walls must not exceed five feet in height and must be placed a minimum <br />horizontal distance of ten feet apart; and <br />(ii) Riprap must not exceed the height of the regulatory flood protection elevation. <br />c. Repair of existing rock riprap, retaining walls, and other erosion control structures above the <br />OHWL does not require a permit provided it does not involve any land alteration UndeF <br />(4) Stormwater management. <br />a. In the bluff impact zone, storm water management facilities are prohibited except by <br />permit if: <br />1. There are no alternatives for storm water treatment outside the bluff impact zone <br />on the subject site; <br />2. The site generating runoff is designed so that the amount of runoff reaching the <br />bluff impact zone is reduced to the greatest extent practicable; <br />3. The construction and operation of the facility does not affect slope stability on <br />the subject property or adjacent properties; and <br />4. Mitigation based on the best available engineering and geological practices is <br />required and applied to eliminate or minimize the risk of slope failure. <br />b. In the water quality impact zone, development that creates new impervious surface, as <br />AIIA Pi, "„ ,,.,,,vy,r.+e„r. ;r. r, 117 148a II ^n^p+�^'^c), or fully reconstructs existing <br />impervious surface of more than 10,000 square feet requires a storm water permit or <br />approved storm water plan. Multipurpose trails and sidewalks are exempt if there is <br />down gradient vegetation or a filter strip that is at least five feet wide. <br />C. In all other areas, storm water runoff must be directed away from the bluff impact <br />zones or unstable areas. <br />(5) Development on steep slopes. Construction of structures, impervious surfaces, land alteration, <br />vegetation removal, or other construction activities are allowed on steep slopes if: <br />a. The development can be accomplished without increasing erosion or storm water <br />runoff; <br />b. The soil types and geology are suitable for the proposed development; and <br />(6) Conditions of land alteration permit approval. <br />a. Temporary and permanent erosion and sediment control measures retain sediment <br />onsite consistent with best management practices in the Minnesota Stormwater <br />Manual; <br />b. Natural site topography, soil, and vegetation conditions are used to control runoff and <br />reduce erosion and sedimentation; <br />C. Construction activity is phased when possible; <br />d. All erosion and sediment controls are installed before starting any land disturbance <br />activity; <br />Page 113 of 160 <br />