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• At present, no construction activities have occurred at the proposed site except <br />for the improvement of an existing road for access to the work area. Anew <br />section of road will be constructed along the toe of the fill and is shown on Figure <br />2.2-6. <br />The topography of the proposed disposal site varies from essentially level near <br />the toe of the fill to slopes of 1.5H:1 V or steeper along the natural slope of the <br />hillside. The surficial soils at the site are of Rivra Loam Variant and Torriorthent <br />series. Available topsoil ranges from 12 inches in the area of the proposed road <br />relocation to 0 inches in the higher elevations of the disposal site, see Figure 4.7- <br />1.Topsoil availability is discussed in Section 4.7. It will be assumed an average <br />of 6 inches of topsoil is available for salvage. <br />Diversion Channels <br />Diversion and collection ditches are shown on Figure 2.2-t3. Sections are <br />presented on Figure 2.2-7. Calculations and assumptions are provided in <br />Appendix M(vii). The diversion and collection ditches around the waste disposal <br />• area (segments A, B, C, D, E, F & I) are designed to handle the 100-year event. <br />Temporary collection and diversion ditches will initially be constructed. The <br />temporary diversion and collection ditches will be extended as additional lifts are <br />placed on the refuse pile. Riprap will not be placed in the temporary ditches. <br />The permanent ditches will be constructed at the earliest date possible. The <br />collection ditch along the toe of the pile will initially be a permanent ditch. The <br />ditches along the sides of the pile will at first be temporary and then be <br />constructed as permanent as the pile grows. The upper diversion ditch will be <br />the last permanent ditch constructed. <br />Initially, all of the run-off from the upland area will be directed to the sediment <br />pond. The final site drainage will divert run-off from the upland areas around the <br />pile in channels designed to handle the 100-year event. <br />Sedimentation Pond <br />The sediment pond and the general drainage plan for the waste disposal site <br />were prepared under the direction of J. E. Stover, Colorado Professional <br />• Engineer, No. 19230. <br />M~ 2.2-11 <br />6/02 <br />