Laserfiche WebLink
• Sediment traps may not be feasible on utility projects due to the <br /> limited work space or the short-term nature of the work. Portable <br /> tanks may be used in place of sediment traps for utility projects. <br /> Maintenance • Sediment shall be removed from the trap when it reaches 1-foot in <br /> Standards depth. <br /> • Any damage to the pond embankments or slopes shall be repaired. <br /> Surface area determined <br /> at top of weir <br /> 1' Min. Overflow <br /> 0, T 1'Min. :,.,':..: _ = o� <br /> y�L ' 1' Min. <br /> 1.5'Min. <br /> Flat Bottom Ri Ra <br /> 3h -1.5" 2"-4"Rock P P <br /> Washed gravel <br /> Note: Trap may be formed by berm or by Geotextile <br /> partial or complete excavation <br /> Discharge to stabilized <br /> conveyance, outlet, or <br /> level spreader <br /> Figure 4.22 Cross Section of Sediment Trap <br /> 1 6' Min. <br /> 1E11 Ed I 1 Min. depth overflow spillway <br /> III-1 1 1-1 1 1—!1 1 I • -111 111- 11-111 1= <br /> Native soil or — !IC - – 421131.41'i... —_ Min. 1' depth <br /> compacted backfill =� 1 1_ 2"-4"' rock <br /> Geotextile 1-11 — 1 — —1 I InI _ Min. 1' depth 3/4"-1.5" <br /> -1 1 I— I_ ! ! 1111,, washed gravel <br /> Figure 4.23 Sediment Trap Outlet <br /> 4-104 Volume 11-Construction Stormwater Pollution Prevention February 2005 <br />