04/28/2010 Env Bd Packet - Laserfiche WebLink

Home Search

DRAFT 4 -28 -2010 d. Post - construction total runoff volume and peak discharge rates with no detention. e. Post - construction total runoff volume and peak discharge rates with detention. 5. If a flood insurance study has been done by the National Flood Insurance Program, the 100 -year flood elevation with and without the floodway, flood fringe, and /or general flood boundary, if available. 6. Locations of all storm water management practices, infiltration areas, and areas not to be disturbed during construction. 7. Drain tiles on the project site shall be identified and rendered inoperable. 8. Location and engineered designs for structural storm water management practices including storm water treatment devices that remove oil and floatable material (e.g., basin outlets with submerged entrances). 9. Normal water level, high water level, and emergency overflow elevations for the site and all ponding systems. 10. Location of areas where construction will be phased to minimize duration of exposed soil areas. Include map and calculations as necessary of areas of grubbing, clearing, tree removal, grading, excavation, fill, and other disturbance; areas of soil or earth material storage; quantities of soil or earth material to be removed, placed, stored, or otherwise moved on site, and delineated limits of disturbance. 11. Location and type of all temporary and permanent erosion prevention, sediment control, storm water runoff, and soil stabilization BMPs, along with procedures to be used to establish additional temporary BMPs as necessary for the site conditions during construction. Standard plates and/or specifications for the BMPs used on the project must be included in the final plans and specifications for the project. Location and design of temporary sediment basins where 10 acres or more (5 acres or more for special or impaired waters) are disturbed and drained to a single point. When site restrictions do not allow for a temporary sediment basin or less than the required acreage is being developed, temporary sediment basins where appropriate are encouraged, but not required in areas with steep slopes or highly erodible soils or to take equivalent measures such as smaller basins, check dams, and vegetated buffer strips. 12. An estimate of the quantities tabulation must be included for all erosion prevention and sediment control BMPs in the SWPPP. 13. Methods to be used for final stabilization of all exposed soil areas. 12 •