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• <br />r~ <br />LJ <br />I • <br />The following design specification for the sediment pond is adapted from DMG <br />Rule 4.05.9(7): <br />The sediment pond is basically a dugout pond. Therefore, very little if any <br />embankment will be constructed. Material will be excavated from original ground <br />to form the sediment pond. However, if topsoil and organic material are deep, <br />some embankment may be required. <br />If an embankment is required, the embankment foundation area shall be cleared <br />of all organic matter, all surfaces sloped no steeper than 1 h:1 v, and the entire <br />foundation surface scarified. <br />The fill material shall be free of sod, large roots, other large vegetation matter <br />and frozen soil, and in no case shall coal-processing waste be used in <br />embankment construction. <br />The placing and spreading of fill material shall be started at the lowest point of <br />the foundation. Materials will be spread in layers approximately 12 inches deep, <br />and such lifts made uniformly over long stretches and for the full width of <br />embankment. Each lift will be moistened or dried to a uniform moisture content <br />suitable for maximum compaction. Hauling equipment will be routed both ways <br />over the fill and routing varied sufficiently to achieve uniform compaction. <br />Compaction will be carried to the edge of the fills so that the final slopes are firm. <br />The embankment shall be constructed so the design height is achieved at all <br />times, including the period after settlement. The combined upstream and <br />downstream side slopes of the settled embankment shall not be steeper than <br />5h:1v, with neither slope steeper than 2h:1v. <br />A failure of this pond would not be expected to cause loss of life or serious <br />property damage. Therefore, DMG rule 4.05.9(8) does not apply. <br />Faces of the embankments including the surrounding areas disturbed will be <br />vegetated to enhance stability. The height of the embankment is less than 10 <br />feet in vertical height measured from the bottom of the channel to the bottom of <br />the spillway. Anti-seep collars will be installed to control seepage along conduits <br />that extend through the embankment. <br />M" <br />2.2-12i <br />9/02 <br />