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• Embankments <br />Typically, the embankments for sedimentation ponds, with the exception of Coyote, have been <br />designed to Ue ten feet or less in height from the upstream toe to the crest of the spillway. <br />Embankment sideslopes for all future dams are designed to be 2H : 1V upstream and 3H : 1V <br />downstream, while the width of the top of the embankment is typically fifteen feet. Atypical <br />embankment cross section is shown in Figure 4.8-2, Typical Sediment Pond Embankment <br />Design. Embankment designs for ponds to be built are summarized in Table 4.8-7, Embankment <br />Designs. <br />Only sukable materials shall be used for the construction of embankments. Sofl, organic, frozen, <br />or coal waste materials will not be used. The embankments shall be built in a series of <br />compacted layers, 8 to 12 inches thick. Each layer shall be leveled and compacted before the <br />next layer is placed. When compaction and in place density tests are performed, they shall be <br />concluded in accordance with standard and approved methods. Maximum cempaction and <br />optimum moisture content shall be determined by laboratory tests in accordance with AASHO <br />Standard Method T99-81. Field compaction and moisture content of embankment materials shall <br />be adequate for use as an earthen fill dam. Embankment censtruction specficetions are <br />• summarized in Table 4.8-7a, Specifications for Embankment Construction. <br />Construction of each sedimentation pond, including excavation and construction of the <br />embankment, shall be certfied by a quelfied registered professional engineer. The professional <br />engineer shall periodically inspect each pond during construction and forward cenificetion of the <br />constructed pond to the Division within sixty days following construction. <br />• 4187 <br />PR-y <br />MAY 13 19`38 <br />