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<br />(a) The plan shall include measures that control the flow of runoff from disturbed <br />areas so as to prevent soil erosion from occurring. <br /> <br />(b) Structural Practices shall be used to control erosion and trap sediment from <br />areas remaining disturbed for more than 21 days. <br /> <br />(c) Sediment Barriers: Sheet flow runoff from denuded areas shall be intercepted by <br />Silt Fence or Diversions to protect adjacent properties and water resources from <br />sediment. Where intended to provide sediment control, Silt Fence shall be placed on a <br />level contour. The relationship between the maximum drainage areas to Silt Fence for <br />a particular slope is shown in the table below: <br /> <br />Table 1: Silt Fence A licabili <br />Maximum drainage area (in acres) <br />to 100 linear feet of Silt Fence <br />0.5 <br />0.25 <br />0.125 <br /> <br />Range <br />draina <br /><2% <br />> 2% but < 20% <br />> 20% but < 50% <br /> <br /> <br />This does not preclude the use of other sediment barriers designed to control sheet <br />flow runoff. The total runoff flow treated by a sediment barrier shall not exceed the <br />design capacity for that sediment barrier. Straw Bale Barriers are not acceptable. <br /> <br />(d) Storm Water Diversion Practices: Storm water diversion practices shall be used <br />to keep runoff away from disturbed areas and steep slopes where practicable. Such <br />practices, which include Swales, Dikes or Berms, Pipe Slope Drains and Diversions, may <br />receive storm water runoff from areas up to ten (10) acres. Storm water diversion <br />practices alone are not considered a sediment control practice unle.ss those are used in <br />conjunction with a sediment settling pond. <br /> <br />(e) All sediment control practices must be capable of ponding runoff in order to be <br />considered functional. <br /> <br />(f) ClearinG and Grubbing will be done in two (2) or more phases. The first phase <br />will include only those locations necessary to install the perimeter soil erosion, sediment <br />and storm water control BMPs. After the perimeter controls are in place and <br />functioning, the remaining phase(s) of clearing and grubbing may continue. <br /> <br />(g) TiminG of Sediment Trapping Practices: Sediment control practices shall be <br />functional throughout all phases of up slope earth disturbing activity. Settling facilities, <br />perimeter controls and other practices intended to trap sediment shall be implemented <br />prior to grading and within seven (7) days from the start of grubbing. They shall <br />continue to function until the up slope development area is permanently re-stabilized. <br /> <br />19 <br />