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Therefore, the 0.8 requirement for thin overburden and the 1.2 requirement for thick overburden <br />are not met. <br />At the maximum stripping depth <br />96.02' overburden <br />+ 7.94' coal <br />103.96' material excavated <br />at 15 % Swell <br />1.15 x (96.02') = 110.42' material replaced <br />110.427103.96' = 1.062 of the initial thickness <br />Therefore, the 0.8 requirement for thin overburden and the 1.2 requirement for thick overburden <br />are not met. <br />Disposal of Excess Spoil <br />All excavated non -coal material from the mining areas will be used for backfilling the mined pits and <br />blending mined areas into the existing topography to achieve the approximate original landform. <br />Therefore, no excess spoil material will exist <br />Postmining Topography <br />Since mining operations will be performed with shovel /truck and dozers at New Horizon 2 instead <br />of a dragline, the post- mining topography was estimated based upon a 15 percent swell factor. <br />Experience from 1995 to 1999 has shown that the initial swell is reduced over time with settling, <br />which results in a net8% increase in volume. The need for the slot cut along BB Road and 2700 <br />Road will cause the overburden behind this area to be slightly raised, but the extra height is still <br />within the limits of approximate original contour. In addition, WFC received a letter, dated 20 <br />September 2002 from San Miguel Power Association, a major NH2 landowner, thatthe post- mining <br />contouring on their property was acceptable. See Attachment 2.04.(2)(c) -5 for the 20 September <br />2002 letter. <br />(Revised June 2010) 2.05.4(2)(c) -9 <br />