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• Embankments <br />Typically, the embankments for sedimentation ponds, with the exception of Coyote, have been <br />designed to be 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. A typical <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 suitable materials shall be used for the construction of embankments. Soft, 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 />conducted in accordance with standard and approved methods. Maximum compaction and <br />optimum moisture content shall be determined by laboratory tests in accordance with AASHO <br />Standard Method T9"I. Field compaction and moisture content of embankment materials shall <br />be adequate for use as an earthen fill dam. Embankment construction specifications 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 certified by a qualified registered professional engineer. The professional <br />engineer shall periodically inspect each pond during construction and forward certification of the <br />constructed pond to the Division within sixty days following construction. <br />• 4-187 <br />PP -'A <br />MAY 13 19`18 <br />