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I <br /> O Sediment traps may not be feasible on utility projects due to the <br /> I 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 /> IStandards depth. <br /> • Any damage to the pond embankments or slopes shall be repaired. <br /> I Surface area determined 44:,_4,mkt. 1, <br /> at top of weir <br /> Lit min.Overflow 1 i <br /> I ,,,s,.,— — T v min. .,:.....::::,-f:-..=: .,---.,.-7:-.7:17J1_74___ <br /> .1... 3.6-51 —T7:::••••::..:... :ItiPlikta. 1 Mn. <br /> is <br /> FiatV Bottom —11.5'Min. T <br /> 2.4„Rock RIpRap <br /> I Note:Trap may be formed by berm or by 3/4"-1.5" <br /> Washed gravel <br /> Geotexthe <br /> partial or complete excavation <br /> I Discharge to stabilized <br /> conveyance,outlet,or <br /> level spreader <br /> I <br /> Figure 4.22 Cross Section of Sediment Trap <br /> I <br /> II 4 61 Min. 'H <br /> IIMM111=7M=M <br /> 1'Min.depth overflow spillway <br /> I I 11=11 111=11 <br /> i i=1 I 1--=I II:7-11 17-11 1=1i 1=1 .....,.•,0.,...I.-. &kilo,. 2, ..- 71 I 1:=11-1=irT=1 I 1=1 I I: <br /> 0.- .i Hi <br /> -..t... -i. ,- 1 . <br /> Native soil or 7'' 1"---:-.17:11 ,:''',.--- --.----.1-i7-7":""4"..7:::. -.,-:,'"„ lr°: 1.g.1;4 I IE Min-"I'depth <br /> I compacted backfill 1 IF-I I F./..'•.:';.::•::....;':::::-•F:3i-:::-::::-1::::.:A=1 ir 2"-41"rock <br /> Geotextile 'I,11- - 7 wMains.h le'd d gepratvhe 3/4'1-1.5" <br /> I <br /> Figure 423 Sediment Trap Outlet <br /> I <br /> I <br /> 1 4-104 Volume 11--Construction Stormwater Pollution Prevention February 2005 <br />