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The waste disposal fill has been designed using recognized professional <br />standards and is certified by Matthew S. Sakurada, Colorado P.E. 415836. <br />All vegetative and organic material must be removed prior to topsoil remov- <br />al. The material is to be removed using standard clearing techniques such <br />as bulldozers or handclearing. Topsoil will be sampled, removed, segregat- <br />ed, stored, and replaced according to the specifications for topsoil handl- <br />ing. The removed organic material may be used to control erosion, promote <br />vegetation and retain moisture through mulching, chipping or scattering of, <br />material. <br />Diversion ditch design is as shown on drawings. All disturbed areas will <br />be revegetated as described in revegetation specifications. <br />The disposal area has been located on the most moderately sloping and natu- <br />rally stable area on the permit area. Ia order to assure additional sta- <br />bility and prevent .mass movement, fill material is to be placed upon the <br />natural terrain in a bench terrace type form. The fill material shall De <br />placed in horizontal lifts in thickness less than two feet. This is to en- <br />sure mass stability, prevent mass movement and to ensure a loclg term static <br />safety factor of 1.5. Calculations on stability follow on attached <br />sheets. <br />No depressions or impoundments are to be constructed on the completed fill <br />so as to be suitable for post-mining land uses. <br />The bench terraces are to be constructed using the following criteria: <br />Each terrace will be a maximum of twenty feet in width. The outslope is to <br />have a maximum slope of lv:2h. No culverts will be allowed within the <br />fill. See drawing plan and cross-sections for actual configuration. The <br />natural stability based on analysis of slidiag and foundations is adequate <br />for safety. For this reason no keyway cuts or rock buttresses are neces- <br />sary. <br />i • <br />