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• ensure stability. The results of these studies are discussed in Exhibit 12, Experimental <br />Practice Information. The fill will be constructed so as to blend in with the existing <br />topography and the average slope outslope of the fill will be approximately 3:1 (horizontal to <br />vertical) topsoiled and will be revegetated according to Section 2.05.4. Mulching and contour <br />furrows as described in Section 2.05.4 have been utilized for erosion control in conjunction <br />with benches on the area of the Streeter Fill that has been completed. Benches have been <br />constructed every 100 vertical feet from the base of the fill at 6600 feet to the 6900 foot level. <br />These benches are 30 feet wide with a 10 percent slope toward the face of the fill. From the <br />6900 feet level to the completion of the fill at elevation 7225, the fill will be graded to an <br />overall 3:1 slope, and will be controlled by the use of mulch, contour furrows, and/or <br />benches. If benches are used, they will be 20 feet wide, or less, and will slope towards the <br />face of the fill at 5%. The hydrologic calculations for the benches and contour furrows are <br />included in Exhibit 7, Hydrologic Information. <br />Prior to depositing any fill on the disposal site, topsoil was removed, segregated, and stored <br />or redistributed as explained in Sections 2.05.4 and 4.06. <br />The site selected for the disposal of the excess spoil was chosen with the intention of <br />maximizing coal recovery and minimizing the amount of disturbed area. The site represents a <br />stable area available for disposal and was chosen in order to avoid affecting additional <br />drainage areas. This selection for the excess spoil disposal site minimizes the total affected <br />acreage by avoiding the disturbance of otherwise undisturbed drainage basins. <br />• The excess spoil to be placed in the disposal structure will be excavated from the pit area <br />using large power shovels so that proper spoil disposal can be achieved. The shovels will <br />load rear end dump trucks which will haul the spoil to the designated fill site. The trucks will <br />dump the spoil to form horizontal lifts not to exceed one hundred (100) feet. The top of the <br />fill will be graded to allow for proper drainage. The fill will be constructed to meet long-term <br />stability criteria. <br /> <br />2.06-7 <br />