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3-16 <br />3.4 FINAL HYDROLOGIC RESTORATION <br />• <br />Final hydrologic restoration shall be accomplished using the best <br />available technology available to minimize erosion and to prevent <br />additional contributions of sediment to stream flow or to run-off <br />outside the permit area. As part of reclamation and abandonment <br />efforts, all of the sedimentation, slurry and fresh water ponds <br />will be backfilled, reclaimed and abandoned, as will all temporary <br />diversion structures. The design of all noted peemanent <br />diversions of the ephemeral channels will satisfactorily convey <br />runoff on a permanent basis. Irrigation will be reinstated on the <br />2.9 acres of cropland taken out of production to facilitate <br />ancillary activities. All other irrigation will be continued over <br />the life of the mine. <br />• <br />The final reclaimed contours are shown in Figure 3.1-1 (original) <br />and 3.1-15 (revision). Vegetative cover, dumped rock and <br />reclaimed contours combine to preclude excessive erosional <br />velocities and to preclude the ponding of water. <br />3.4.1 Channel Restoration <br />All of the temporary diversions shall be restored to their <br />original profile and alignment, with the excavation of backfill <br />material and the placement of a suitable topsoil material on <br />sideslopes which shall not be greater than 2H:1V. The topsoil <br />shall then be seeded and mulched to establish a vegetative cover <br />of native grasses and shrubs (see Section 3.1.1). For the channel <br />1/17/86 <br />