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8. Stream Channel Diversions Drainageway reconstruction is discussed under Section 4.8.13, Vol. IV of the permit application. Channel lining structures, retention basins, and artificial channel roughness structures aze proposed for use to control erosion. ThE:se means aze proposed to be approved by the Division since they aze necessary to control erosion, they aze stable and will require infrequent maintenanc:. The applicant uses rock check structures, various geotextiles, and rapid growing vegetation within reconstructed drainages to control erosion. (4.05.4(2)(a)). C. Sedimentation Ponds Sediment ponds aze discussed under Section 4.8.1.4, Vol. IV of the permit application. The applicant uses sedimentation ponds in all disturbed drinages to control the increased sediment loads within the ephemeral drainages on the mine site. All sediment ponds aze designed to contain or treat the 10-year, 24- hourevent and safely pass the 25-yeaz, 24-hour event, at a minimum. One MSHA size pond exists on the site in the Coyote drainage, but as of 1997, this pond is usually dry. D. Surface and Ground Water Monitoring The applicant will conduct monitoring of ground water in a manner approved by the Division. The ground water monitoring plan c<ut be found in Section 4.8.5.2a, Vol. IV of the permit application. (4.OS.I3(1)). 2. The applicant will conduct monitoring of surface water in a manner approved by the Division. The monitoring plan was submitted tinder 2.05.6(3)(b)(iv) and can be found in Section 4.8.S.la of the permit application, Vol. IV. (4.05.13(2)). The Division has reviewed the surface and ground water monitoring plans as part of the revision process. These monitoring plans aze adequate to monitor for the development of impacts, if any should develop. E. Probable Hydrologic Consequences The probable hydrologic consequences of the Trapper mine aze described in section 4.8 of the permit application, and aze summarized below. Trapper Mine 2~ May lJ, 1998