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<br />Section 616.71 (a) Continued. <br />within the area where overburden has been removed as explained in <br />Section 780.35. This spoil will be hauled to two designated <br />disposal areas which are addressed in Exhibit <br />and located on the Eckman Park Mine Plan (Pfap <br />spoil pile No. 1 is located north of the 8050 <br />spoil pile No. 2 is located between the 7400 <br />Fuels has designated two alternatives for the <br />construction of pile No. 2. <br />9, Excess Spoil, <br />2). Excess <br />pit and excess <br />snd 770 pits. Energy <br />location and <br />These fill structures will be designed so that drainage will not be <br />directed over the outslope and all surface water runoff from the <br />area above the fills will be diverted away from the fills, according <br />to the diversion design discussed under Sections 780.21 and 816.43 <br />and shown on the Energy Mines No. 1 and 2 Hydrology (Pfap 13) and <br />Eckman Park Hydrology (Pfap 14), and outlined in Figure 32, Permanent <br />• <br />Diversion Structures. <br />Runoff will be directed to sedimentation pond A located at the base <br />of Pinnacle Peak. The fill for these structures will be placed in <br />lifts not to exceed four feet. To avoid the possibility of the <br />excessive voids, compaction will be about 90 percent of AASHTO T-99 <br />density. A detailed geotechnical study of the sites was performed <br />to evaluate and ensure stability. The results of this study confirm <br />the stabilit}• of the fill and are discussed in Exhibit 9, Excess <br />Spoil. The fill will be constructed so as to blend in with the <br />existing topography and the average slope will be approximately 3:1 <br />(horizontal to vertical) and will be revegetated according to <br />Sections 816.111-816.117. Benches will be utilized every 50 vertical <br />feet to aid in controlling erosion while revegetation is occurring <br />and to help achieve an adequate factor of safety. <br /> (b) The fill shall be designed using recognized professional standards, <br /> certified by a registered professional engin=er, and approved by the <br /> <br />816-88 <br />