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Trapper assesses the ongoing impacts to the hydrologic system in its annual <br /> hydrologic report submitted as Appendix W of the permit application. The probable <br /> hydrologic consequences as set forth in Volume 4 and Appendix W are summarized <br /> below. <br /> A. Water Quality Standards and Effluent Limitations <br /> Surface discharge at the Trapper Mine is monitored under CDPS permit <br /> #CO-0032115 issued by the Colorado Department of Public Health and <br /> Environment. In addition, the applicant has quarterly and monthly reporting <br /> requirements imposed by the Division as part of its surface water monitoring <br /> program. Acute toxicity testing through bio-monitoring sampling is required in <br /> 1. East Flume System 2. Middle Pyeatt System <br /> drainages if mine-contaminated water is discharged. <br /> B. Stream Channel Diversions <br /> Drainage way reconstruction is discussed under Section 4.8.1.3, Vol. IV of the <br /> permit application. Channel lining structures, retention basins, and artificial <br /> channel roughness structures are proposed for use to control erosion. The <br /> applicant uses rock check structures, various geotextiles, and rapid growing <br /> vegetation within reconstructed drainages to control erosion. (4.05.4(2)(a)). <br /> C. Sedimentation Ponds <br /> Sediment ponds are discussed under Section 4.8.1.4, Vol. IV of the permit <br /> application. <br /> The applicant uses sedimentation ponds in all disturbed drainages to control <br /> increased sediment loads resulting from disturbance within the ephemeral <br /> drainages on the mine site. All sediment ponds are designed to contain or treat, <br /> at a minimum, the 10-year, 24-hour event and to safely pass the 25-year, 24-hour <br /> event. One MSHA size pond exists on the site in the Coyote drainage. <br /> D. Surface and Ground Water Monitoring <br /> 1. The applicant will conduct monitoring of ground water in a manner <br /> approved by the Division. The ground water monitoring plan can <br /> be found in Section 4.8.5.2a, Vol. IV of the permit application <br /> (4.05.13(1)). <br /> 2. The applicant will conduct monitoring of surface water in a manner <br /> approved by the Division. The monitoring plan was submitted <br /> under 2.05.6(3)(b)(iv) and can be found in Section 4.8.5.la of the <br /> permit application, Vol. IV(4.05.13(2)). <br /> The Division reviewed the surface and ground water monitoring plans as part of the renewal <br /> 16 <br />