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-9- <br />• <br />The stability of cut slopes in the overburden rock was extensively in- <br />vestigated and reported in our report, Job No. 5029, dated January 29, <br />1979. We understand Energy Fuels plans to make the cut at a constant <br />angle of 1.5:1 which should be more than adequately stable. Good sur- <br />face drainage conditions should be provided in all cut areas. At the <br />toe of all cuts we recommend that a small drainage ditch be maintained <br />through the full length of the cut. Where possible, the ditch should <br />have at least a 1 percent slope to the outlet. For cuts in excess of <br />500 feet in length, it will probably be desirable to crown the ditch <br />slope and drain cut in two directions. The actual drainage in individual <br />cuts can only be established in a field with the ground profile as well <br />as the planned final grade profile. <br />• <br />FILL SECTIONS <br />We anticipate fill will be constructed of soils, sedimentary rocks <br />from required cuts, and spoil from the initial box cut for the mine. <br />Fill constructed from the sedimentary rock near-surface will be somewhat <br />more weathered than spoil from the mine area. The near-surface soils <br />will perform essentially as a clay. Provided the fills are placed in <br />reasonably thin lifts and compacted to high density, all of these materials <br />should perform adequately for support of haul roads. The clay soils have <br />substantially lower support characteristics as indicated by the lower CBR <br />values in our tests conducted for this investigation. In our opinion, <br />it is desirable to place the clay from required cuts in the lower portions <br />• of the fill wherever possible. We believe the performance of the road <br />