Ordinance - #23-14 - 11/14/2023 - Laserfiche WebLink

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1 2. The structures are used only to correct an established erosion problem as determined by 2 the City of Ramsey. 3 3. The size and extent of the structures are the minimum necessary to correct the erosion 4 problem and are not larger than the following, unless a professional engineer determines 5 that a larger structure is needed to correct the erosion problem: 6 (i) Retaining walls must not exceed five feet in height and must be placed a minimum 7 horizontal distance of ten feet apart; and 8 (ii) Riprap must not exceed the height of the regulatory flood protection elevation. 9 c. Repair of existing rock riprap, retaining walls, and other erosion control structures above the 10 OHWL does not require a permit provided it does not involve any land alteration. 11 (4) Stormwater management. 12 a. In the bluff impact zone, storm water management facilities are prohibited except by 13 permit if: 14 1. There are no alternatives for stoiui water treatment outside the bluff impact zone 15 on the subject site; 16 2. The site generating runoff is designed so that the amount of runoff reaching the 17 bluff impact zone is reduced to the greatest extent practicable; 18 3. The construction and operation of the facility does not affect slope stability on the 19 subject property or adjacent properties; and 20 4. Mitigation based on the best available engineering and geological practices is 21 required and applied to eliminate or minimize the risk of slope failure. 22 b. In the water quality impact zone, development that creates new impervious surface, or 23 fully reconstructs existing impervious surface of more than 10,000 square feet requires a 24 stoiui water permit or approved storm water plan. Multipurpose trails and sidewalks are 25 exempt if there is down gradient vegetation or a filter strip that is at least five feet wide. 26 c. In all other areas, stoiui water runoff must be directed away from the bluff impact zones 27 or unstable areas. 28 (5) Development on steep slopes. Construction of structures, impervious surfaces, land alteration, 29 vegetation removal, or other construction activities are allowed on steep slopes if: 30 a. The development can be accomplished without increasing erosion or stoini water runoff; 31 b. The soil types and geology are suitable for the proposed development; and 32 (6) Conditions of land alteration permit approval. 33 a. Temporary and permanent erosion and sediment control measures retain sediment onsite 34 consistent with best management practices in the Minnesota Stoiniwater Manual; 35 b. Natural site topography, soil, and vegetation conditions are used to control runoff and 36 reduce erosion and sedimentation; 37 c. Construction activity is phased when possible; 38 d. All erosion and sediment controls are installed before starting any land disturbance 39 activity; 40 e. Erosion and sediment controls are maintained to ensure effective operation; 41 f. Best management practices for protecting and enhancing ecological and water resources 42 identified in Best Practices for Meeting DNR General Public Waters Work Peiniit GP 43 2004-0001. 44 (7) Compliance with other plans and programs. All development must: 45 a. Be consistent with Minn. Stats. ch. 103B, and local water management plans completed 46 under [Minnesota Rules] chapter 8410; 47 b. Meet or exceed the wetland protection standards under Minnesota Rules, chapter 8420; 48 and 49 c. Meet or exceed the floodplain management standards under Minnesota Rules, chapters 50 6120.5000-6120.6200. 51 (K) Subdivision and land development standards. 52 (1) Purpose. Attachment A — Ordinance #23-14 Page 100 of 141