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2.05.3 <br />The fill material shall be free of sod, large roots, other large vegetation <br />matter, and frozen soil, and in no case shall coal -processing waste be used <br />in embankment construction. <br />The placing and spreading of fill material shall be started at the lowest point <br />of the foundation. Materials will be spread in layers approximately 12 inches <br />deep, and such lifts made uniformly over long stretches and for the full width <br />of embankment. Each lift will be moistened or dried to a uniform moisture <br />content suitable for maximum compaction. Hauling equipment will be routed <br />both ways over the fill and routing varied sufficiently to achieve uniform <br />compaction. Compaction will be carried to the edge of the fills so that the <br />final slopes are firm. <br />Rule 4.05.9(7)(d) requires that the minimum elevation of the top of the <br />settled embankment be 1.0 foot above the water surface in the pond with the <br />emergency spillway flowing at design depth. The embankment shall be <br />constructed so the design height is achieved at all times, including the period <br />after settlement. <br />The combined upstream and downstream side slopes of the settled <br />embankment shall not be steeper than 5h:1 v, with neither slope steeper than <br />2h:1 v. <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 <br />10 feet in vertical height measured from the bottom of the channel to the <br />bottom of the spillway. Anti -seep collars will be installed to control seepage <br />along conduits that extend through the embankment. <br />The sediment pond will be lined with a 12 -inch thick low permeability soils liner. <br />The soils liner is proposed to be constructed using native clay soils or native soils <br />amended with bentonite. For the native soils proposed to be used as liner <br />material, pre -construction testing will initially include grain size analysis, Atterberg <br />limits determination, Proctor, and hydraulic conductivity to determine whether or <br />not the native soils can meet the Hydraulic Conductivity specification of 1x10-7 <br />cm/sec. Where the native soils are determined to be capable of meeting the <br />specification, the remainder of the borrow material testing will be completed as <br />outlined in Appendix T, Table 1. Where the native soils are unable to meet the <br />PR -02 2.05-19- 10/12 <br />