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~^ CHAGRIN <br />C/' ~ RIVER <br />WATERSHED <br />PARTNERS <br />May ao16 <br />vii. Sediment and stormwater management basins including their <br />sediment settling volume and the maximum expected disturbed <br />area that will be directed to the sediment pond during <br />construction. The plan should include a summary of the <br />following: <br />i. The required sediment storage and dewatering volumes <br />ii. The provided sediment storage and dewatering volumes <br />iii. The weir length or skimmer size, as applicable <br />iv. The weir length or skimmer size provided <br />viii. Data sheets for all sediment traps, sediment basins, and SCMs <br />that identify contributing drainage area, disturbed area, water <br />quality volume, sedimentation volume, dewatering volume, <br />practice surface area, facility discharge and dewatering time, <br />outlet type and dimensions, and any other relevant parameters <br />for each practice. <br />ix. A separate plan and profile view of each individual sediment <br />settling pond and its outlet structure. Detail drawings of the <br />outlet structure shall indicate the following elevations: <br />a) Pond bottom <br />b) Elevation required to store the required sediment storage <br />volume , <br />c) For sediment basins, the elevation at which the skimmer <br />is attached <br />d) For sediment traps, the top and bottom of the stone <br />outlet section <br />e) Elevation required to store the dewatering volume, <br />exclusive of the sediment storage volume <br />f) Elevation of the top of embankment <br />g) Crest of the emergency spillway <br />x. Where used as asediment-settling pond during construction, the <br />plan shall include a detail drawing of the temporary outlet <br />configuration of the permanent storm water basin with the <br />following information specified: <br />a) Storage volume provided below the elevation at which <br />the skimmer or other surface dewatering device is <br />attached <br />b) Elevation at which the skimmer or other surface <br />dewatering device is attached <br />c) Elevation at which the full dewatering zone is stored <br />above the skimmer invert <br />d) Any temporary modification to permanent outlet orifices <br />or weirs required to ensure no discharge below the <br />skimmer invert and only the skimmer controls the <br />discharge up to the top of the dewatering volume. <br />e) Calculations of the sediment storage volume, dewatering <br />volume and skimmer drawdown time shall also be <br />provided <br />12 <br />