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Our Job 81-20-00 <br />4 .5 BENCH ] NG <br />General. In general, benching is to be performed <br />for all fill nasses placed on slopes with an inclination of <br />five horizontal to one vertical or steeper, to remove com- <br />pressible earth material and to provide vertical and lateral <br />support for the fi11. Benching is sometimes required on <br />flatter slopes where stripping has not removed all compressible <br />soil. A11 benching is to be performed in accordance with <br />the recommendations of the Consultant and is subject to his <br />approval. <br />4.51 <br />4 .52 <br />4.53 <br />CanYon Fi11.Prior to placing fill in an)' can)'on <br />bottom, all earth nraterial not suitable for support of the <br />fill is to be removed. Detailed reconmendations for this <br />removal and the installation of subdrains, where required, <br />are discussed in this report or later memoranda. Canyon fill <br />is to be keyed into firm earth material as it is placed, in <br />accordance with recommendations rnade by the Consultant. <br />Sidehill Fi11. Sidehill fill masses are to be <br />placed on horizontal benches cut through the soft soil and <br />weathered rock extending into form earth rnaterial. Plate <br />B-2.7 - Typical Sidehill Fi11 Mass illustrates the typical <br />benching required for support of a sidehill fill mass. The <br />actual width and height of the benches will depend on the <br />k eyway rt'idth, the slope inclination and the thickness of <br />the soft earth rnaterial; benches are to be arranged so that a <br />gradual change (increase or decrease depending on geometry <br />or fill) in fill width is accomplished. Specific recommen-