4.9. SR 01-03-2017 - Laserfiche WebLink

Home Browse Search

ii. Stormwater - Describe the quantity and quality of stormwater runoff at the site prior to and post construction. Include the routes and receiving water bodies for runoff from the site (major downstream water bodies as well as the immediate receiving waters). Discuss any environmental effects from stormwater discharges. Describe stormwater pollution prevention plans including temporary and permanent runoff controls and potential BMP site locations to manage or treat stormwater runoff. Identify specific erosion control, sedimentation control or stabilization measures to address soil limitations during and after project construction. As discussed in Question 7 (Cover Types), the majority of the existing project site is vegetated and categorized as "wooded/forest" and "wetlands". In addition, the soils found on the project site are primarily sands and gravels having high infiltration rates resulting in little stormwater runoff. Post construction, the majority of the project area will remain vegetated and will fall under the "wooded/forest" and "brush/grassland" categories. Stormwater runoff resulting from the proposed project will generally be a result of areas converted to open dirt for race track, and gravel for access roadways and parking. Stormwater generated by these areas will be directed into appropriately sized infiltration basins that will be strategically placed based on the site layout. The Project Proposer will obtain a National Pollutant Discharge Elimination System construction permit. In addition, Stormwater Pollution Prevention Plan (SWPPP) will be prepared as required for all construction activities that involve grading and excavation. General SWPPP requirements include the following: • Stabilized construction entrances/vehicle trackout controls • Silt fence shall be installed prior to construction as indicated on the project's Grading and Erosion Control Plan • Additional silt fence shall be provided where grading occurs within 50' of a wetland • Category 3 erosion control blankets shall be installed on all slopes 3:1 or greater • A Certified Erosion Control Supervisor shall be provided to work with the project engineer to oversee SWPPP implementation, installation, inspection, and maintenance of erosion control BMPs before, during, and after construction. • A Certified Installer shall be provided for each contractor/subcontractor. • Entire construction site shall be inspected and results recorded a minimum of once every seven days during active construction and within 24 hours after a rainfall event greater than 0.5 inches in 24 hours. iii. Water appropriation - Describe if the project proposes to appropriate surface or groundwater (including dewatering). Describe the source, quantity, duration, use and purpose of the water use and if a DNR water appropriation permit is required. Describe any well abandonment. If connecting to an existing municipal water supply, identify the wells to be used as a water source and any effects on, or required expansion of, municipal water infrastructure. Discuss environmental effects from water appropriation, including an assessment of the water resources available for appropriation. Identify any measures to avoid, minimize, or mitigate environmental effects from the water appropriation. Page 13