2007-012A - Laserfiche WebLink

Home Browse Search

i Chapter 4 - Best Management Practices for Erosion and Sediment Control Erosion and Sediment Control The construction of the sediment basin shall be carried out in a manner such that erosion and water pollution are minimized downstream . w Final Disposal When temporary structures have served their intended purpose and the contributing drainage area has been properly stabilized , the embankment and resulting sediment deposits are to be leveled or otherwise disposed of according to the approved pollution control plan . Maintenance The embankment of the basin should be checked regularly to ensure that it is structurally sound and has not been damaged by erosion or construction equipment. The emergency spillway should be checked regularly to ensure that its lining is well established and erosion- resistant. The basin should be checked after each runoff-producing rainfall for s sediment cleanout. When the sediment reaches the cleanout level mark , it shall be removed and properly disposed of. Information to be Submitted for Approval Sediment Basin designs and construction plans submitted for review to the appropriate regulatory agency shall include : 1 . Specific location of the dam . 2 . Plan view of dam , storage basin and emergency spillway. 3 . Cross-sections and profiles of dam , principal spillway and emergency spillway. 4 . Details of pipe connections , riser to pipe connection , riser base , anti-seep collars, trash rack, and anti-vortex device . 5 . Runoff calculations for 10-year frequency storm. 6 . Storage Computations a . Total required b . Total available C. Level of sediment at which cleanout shall be required ; to be stated as a distance from the riser crest to the sediment surface . i 7 . Calculations showing design of pipe and emergency spillway. 4-93