2011-009 Council Ordinances - Laserfiche WebLink

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(c) If redevelopment will disturb fifty percent or more of existing impervious surface or increase impervious surface by fifty percent or more. For the purpose of this paragraph, the extent of disturbance is the area of exposure of underlying soils. (d) Any land disturbing activity, regardless of size, that the City determines would otherwise cause an adverse impact to an environmentally sensitive area or other property. (2) Stormwater Management Criteria - Site plans for new development of any kind will be assessed for stormwater quantity control and stormwater quality management. The general policy on stormwater runoff rates is to reduce the impacts of development by maintaining predevelopment hydrological conditions in the following ways: (a) Decrease runoff volume. (b) Decrease erosion and sedimentation. (c) Decrease flow frequency, duration, and peak runoff rates. (d) Increase infiltration (groundwater recharge) or filtration. (e) Maintain existing flow patterns. (f) Reduce time to peak flows by increasing the time of concentration to and through storm sewers. (g) Storage of stormwater runoff on site. (h) Avoid channel erosion. (i) The proposed project must not adversely affect water level off the site during or after construction. (3) Stormwater Management Plan Requirements — The Stormwater Management Plan shall be prepared and signed by a duly licensed engineer in the state of Minnesota. The following exhibits must accompany the permit application. 2 plan sets, full size (22 inches by 34 inches); one plan set, reduced to maximum size of 11 inches by 17 inches. Additional copies may be required in accordance with the applicable zoning and/or subdivision provisions of city code. The minimum information requirements of the Stormwater Management Plan shall be consistent with the most recent version of the NPDES Permit requirements and include the following information: (a) A Grading, Erosion and Sediment Control Plan and, for projects that require a NPDES permit, a Stormwater Pollution Prevention Plan.