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• ensure stability. The results of these studies are discussed in <br />Exhibit 12, Experimental Practice Information. The fill will be <br />constructed so as to blend in with the existing topography and the <br />average slope outslope of the fill will be approximately 3:1 <br />(horizontal to vertical) topsoiled and will. be revegetated <br />according to Section 2.05.4. Mulching and contour furrows as <br />described in Section 2.05.4 have been utilized for erosion control <br />in conjunction with benches on the area of the Streeter Fill that <br />has been completed. Benches have been constructed every 100 <br />vertical feet from the base of the fill at 6600 feet to the 6900 <br />foot level. These benches are 30 feet wide with a 10 percent slope <br />toward the face of the fill. From the 6900 feet level to the <br />completion of the fill at elevation 7225, the fill will be graded <br />to an overall 3:1 slope, and will be controlled by the use of <br />mulch, contour furrows, and/or benches. If benches are used, they <br />will be 20 feet wide, or less, and will slope towards the face of <br />the fill at 5$. The hydrologic calculations for the benches and <br />contour furrows are included in Exhibit 7, Hydrologic Information. <br />Prior to depositing any fill on the disposal site, topsoil was <br />removed, segregated, and stored or redistributed as explained in <br />i • Sections 2,05.4 and 4.06. <br />The site selected for the disposal of the excess spoil was chosen <br />with the intention of maximizing coal recovery and minimizing the <br />amount of disturbed area. The site represents a stable area <br />available for disposal and was chosen in order to avoid affecting <br />additional drainage areas. This selection for the excess spoil <br />disposal site minimizes the total affected acreage by avoiding the <br />disturbance of otherwise undisturbed drainage basins. <br />The excess spoil to be placed in the disposal structure will be <br />excavated from the pit area using large power shovels so that <br />proper spoil disposal can be achieved. The shovels will load rear <br />end dump trucks which will haul the spoil to the designated fill <br />site. The trucks will dump the spoil to form horizontal lifts not <br />to exceed one hundred (100) feet. The top of the fill will be <br />graded to allow for proper drainage. The fill will be constructed <br />to meet long-term stability criteria. <br /> <br />2.06-7 <br />