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/~' CHAGRIN <br />G/`'/y7 RIVER <br />~~ PAARTNERS D <br />May 2016 <br />(d) SEDIMENT CONTROL PRACTICES. The SWP3 shall include a description of, and <br />detailed drawings for, all structural practices that shall store runoff, allowing sediments to <br />settle and/or divert flows away from exposed soils or otherwise limit runoff from exposed <br />areas to minimize sediment discharges from the site. Structural practices shall be used to <br />control erosion and trap sediment from a site remaining disturbed for more than 14 days. <br />Such practices may include, among others: sediment settling ponds, silt fences, storm <br />drain inlet protection, and earth diversion dikes or channels which direct runoff to a <br />sediment settling pond. The design, installation and maintenance of erosion and sediment <br />controls shall address factors such as the amount, frequency, intensity and duration of <br />precipitation, the nature of resulting stormwater runoff, and soil characteristics, including <br />the range of soil particle sizes expected to be present on the site. <br />(e) All sediment control practices must be capable of ponding runoff in order to be <br />considered functional. Earth diversion dikes or channels alone are not considered a <br />sediment control practice unless used in conjunction with a sediment settling pond. <br />Sediment control practices must meet the following requirements: <br />(1) Timing. Sediment control structures shall be functional throughout the course of <br />earth disturbing activity. Sediment basins and perimeter sediment barriers shall <br />be 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, <br />appropriate controls must be constructed or existing controls altered to address <br />the changing drainage patterns. <br />(2) Sediment settlingponds. A sediment settling pond, or equivalent best <br />management practice upon approval from the Village of Mayfield Engineer <br />and/or the Cuyahoga County SWCD, is required for any one of the following <br />conditions: <br />A. Concentrated stormwater runoff. <br />B. Runoff from drainage areas which exceeds the design capacity of silt <br />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 Rai~zwater and Land <br />Development. The maximum allowable contributing drainage area to a sediment <br />trap shall be limited to less than 5 acres. Contributing-drainage areas of 5 acres <br />or more shall be treated with a sediment basin. An equivalent best-management <br />practice maybe utilized upon approval from the Village of Mayfield. <br />The sediment-settling pond shall provide both a sediment storage zone and a <br />dewatering zone. The volume of the dewatering zone shall be at least 1,800 <br />cubic feet of storage per acre of total contributing drainage area. The dewatering <br />structure of sediment basins shall be designed to have a minimum 48-hour drain <br />time, and, unless infeasible, be designed to always withdraw runoff from the <br />surface of the pond throughout the storm cycle. As such, a skimmer discharge <br />16 <br />