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46 <br />additional stability analysis will be conducted and designs modified if <br />appropriate. <br />Construction of the initial refuse disposal area has involved disturbance of <br />approximately 7 acres to accommodate the sediment pond access road, refuse <br />belt, and storage capacity for the first 2 to 3 years of the operation. The area was <br />cleared of vegetation and topsoil salvaged and stockpiled. As the refuse disposal <br />area is expanded, clearing and topsoil removal will precede refuse disposal as <br />required to provide operating room. During this construction, it may be necessary <br />to use explosives, especially when constructing the under drain structure. Use of <br />explosives is discussed in Exhibit 26, Blasting Plan. The analyses as presented <br />herein was conducted during the 1984 permitting process and ultimately approved <br />for construction. These analyses relied primarily on empirical data. The operator <br />had committed to provide the Division with additional testing on in-place <br />material. In January 1987, WFC sampled the refuse. A stability analyses was run <br />on this material and found to exceed the minimum safety requirements of the <br />CMLRD. The results of these analyses are presented in Exhibit 30, New Elk <br />Refuse Pile Stability (5/6/87). <br />A stability analysis was conducted for the coal processing waste pile at the New <br />Elk Mine. This work included laboratory identification, testing of the waste <br />material, and a stability analysis of the proposed pile to evaluate its anticipated <br />behavior with assumed strength characteristics. The fill area is a channel for an <br />ephemeral stream, which did not contain natural, springs being recharged from <br />the upper reaches of the basin. Geologic mapping of the area was performed by <br />the operator. The majority of the refuse site is underlain by either consolidated <br />materials of the Poison Canyon and Raton Formation, or by what appeared to be <br />thin layers of colluvium and soil overlying these strata. A fan terrace and <br />undifferentiated surficial material was encountered near the outlet of the drainage <br />basin. <br />A cross section through the area is shown in Figure 11, Cross Section A -AI, Final <br />Configuration. As shown on this figure, the waste material is to be placed in 50 - <br />foot high benches. The out slopes will be 2H:1V. The overall slope of the fill <br />area including the benches between terraces is about 3.5H: IV. Waste will be <br />placed in two -foot lifts and compacted to achieve a minimum of 90% maximum <br />dry density as determined by ASSHRTO T99-70/ASTM D698-70 Standard <br />Proctor Compaction. <br />A limited sample of the coal processing waste was collected by the operator. <br />While there was insufficient sample to conduct moisture density and shear <br />strength testing, enough material was available for identification testing. A grain <br />size distribution of the material is shown in Figure 12, Grain Size Distribution, <br />and Coal Processing Waste. By the Unified Soil Classification System, the waste <br />classifies as a GW soil that is well -graded sandy gravel. It was expected that <br />Section 2.05 RN -6 10/17/2016 <br />