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• 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 tanks <br />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 L4' Min._ I 1 <br />at top of weir <br />1'Min.Overflow <br />T 1' Min. o _ oc�T� <br />y :.'• �.:.:` '::.; �.:: •; : 0 1 Min. <br />\� 3.5'-5' <br />11.5' Min. •• <br />,,7 Flat Bottom RipRap <br />3/" - 1.5" 2"-4 Rock <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 4.2.16 — Cross Section of Sediment Trap <br />6' Min. �{ <br />1' Min. depth overflow spillway <br />Native soil or I —Min. 1' depth <br />compacted backfilt ! : • : '. ' `' - 2"-4"' rock <br />'. ';'.,': --_ Min. 1' depth 3/4"-1.5" <br />Geotextile � III � I = = � III= = = <br />washed gravel <br />Figure 4.2.17 — Sediment Trap Outlet <br />• <br />• <br />• <br />Volume H— Construction Stormwater Pollution Prevention - August 2012 <br />4-103 <br />