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<br />Section 816.46(0) Continued. <br />In all cases, dense clay will be used as fill material in <br />sedimentation pond embankments. In no instances will coal processing <br />waste be used. No coal processing waste is produced at the site and <br />therefore, none is available. See the discussion under Section <br />780.25 (d). All fill material will be selected to exclude the <br />presence of sod, large roots, or other large vegetative matter and <br />frozen material. <br /> <br />~~ <br />(p) The placing and spreading of fill material shall be started at the <br />lowest point of the foundation. The fill shall be brought up in <br />horizontal layers of such thickness as is required to facilitate <br />compaction and meet the design requirements of this Section. Compaction <br />shall be conducted as specified in the design approved by the regulatory <br />authority. <br />The placing and spreading of fill will be started at the lowest part <br />of the foundation and will be brought up in lifts of ten inches to <br />facilitate compaction and to meet the design requirements of Section <br />816.46. Each lift will be compacted so that the density of the <br />material is adequate to meet design criteria for stability and <br />safety. See the construction plans and specifications in Exhibit 42, <br />Drainage and Sediment Control Plan. <br />(q) If a sedimentation pond has an embankment that is more than 20 feet <br />in height, as measured from the upstream toe of the embankment to the <br />crest of emergency spillway, or has a storage volume of 20 acre-feet or <br />more, the following additional requirements shall be met: "- - <br />(1) An appropriate combination of principal and emergency spillways shall <br />be provided to discharge safely the runoff resulting from a 100- <br />816-57R Revised - January, 1991 <br />