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EXHIBIT B: NEW CHAPTER 927 <br />Sediment control practices must meet the following requirements: <br />(1) Timin . Sediment control structures shall be functional throughout the course of <br />earth disturbing activity. Sediment basins and perimeter sediment barriers shall be <br />implemented prior to grading and within seven (7) days from the start of <br />grubbing. They shall continue to function until the up slope development area is <br />restabilized. As construction progresses and the topography is altered, appropriate <br />controls must be constructed or existing controls altered to address the changing <br />drainage patterns. <br />(2) Sediment settling ponds. A sediment settling pond, or equivalent best <br />management practice upon approval from the City Engineer and/or his authorized <br />representative, is required for any one of the following conditions: <br />A. Concentrated stormwater runoff. <br />B. Runoff from drainage areas which exceeds the design capacity of <br />silt fence (see Table 3)- inlet protection, or other sediment barriers; <br />C. Runoff from common drainage locations with 10 or more acres of <br />disturbed land. <br />Sediment settling ponds shall be provided in the form of a sediment trap or <br />sediment basin as defined in the latest edition of Rainwater and Land <br />Development. "The maximum allowable contributing drainage area to a <br />sediment trap shall be limited to less than 5 acres. Contributing -drainage <br />areas of 5 acres or more shall be treated with a sediment basin. An <br />equivalent best -management practice may be utilized upon approval from <br />the City of Forth Olmsted. <br />The sediment -settling pond shall provide both a sediment storage zone and <br />a dewatering zone. The volume of the dewatering zone shall be at least <br />1,800 cubic feet of storage per acre of total contributing drainage area. <br />The dewatering structure of sediment basins shall be designed to have a <br />minimum 48-hour drain time, and, unless infeasible, be designed to <br />always withdraw runoff from the surface of the pond throughout the storm <br />cycle. As such, a skimmer discharge device consistent with Rainwater and <br />Land Development shall be provided to dewater sediment basins. <br />Sediment traps shall also provide both a sediment storage zone and <br />dewatering zone, but the outlet structure shall be constructed consistent <br />with the specifications contained in the latest edition of Rainwater and <br />Land Development. <br />When post -construction detention/water quality ponds are to be used as <br />temporary sediment trapping BMPs, a skimmer discharge device <br />