11-20-2006 Council Agenda - Laserfiche WebLink

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The permanent storm water management system must be designed such that the discharge from the project will minimize any increase in the temperature of trout stream receiving waters resulting from the 1, and 2 -year 24 -hour precipitation events. This includes all tributaries of designated trout streams within the section that the trout stream is located. Projects that discharge to trout streams must minimize the impact using one or more of the following measures, in order of preference: Minimize new impervious surfaces. Minimize the discharge from connected impervious surfaces by discharging to vegetated areas, or grass swales, and through the use of other non - structural controls. Infiltration or evapotranspiration of runoff in excess of pre - project conditions (up to the 2 -year 24 -hour precipitation event). If ponding is used, the design must include an appropriate combination of measures such as shading, filtered bottom withdrawal, vegetated swale discharges or constructed wetland treatment cells that will limit temperature increases. The pond should be designed to draw down in 24 hours or less. Other methods that will minimize any increase in the temperature of the trout stream. If the proposed project site includes a special water tributary that currently experiences erosion and/or sedimentation problems, the applicant must work with community to include channel modifications in the project that will also address the existing erosion and/or sedimentation problem. Permanent buildings erected on sites that border directly on and all tributaries directly to a special water shall not be occupied until the permanent vegetative cover has been established. Such cover must meet this ordinance's definition of "final stabilization ". Page 11: [9] Deleted Lee Elfering :10/16/2006',7:43:00 AM'. ;. Regional Ponding - The local authority may establish off -site stormwater management and associated fees, provided that provisions are made to manage stormwater by an off -site facility, and provided that all of the following conditions for the off -site facility are met: The facility is in place; The facility is designed and adequately sized to provide a level of stormwater control that at least meets the ordinance standards The local approval authority is satisfied that the facility has a legally obligated entity responsible for its long -term operation and maintenance. Page 20: [10] Deleted s Lee Eifering 11/17/2006 9:09:00 A14 REQUIREMENTS FOR DISCHARGES TO SPECIAL WATERS Additional BMPs together with enhanced runoff controls, are required for discharges to the following special waters (part B.1 through B.8 of Appendix A). The BMPs identified for - 3 4 -