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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 reporting requirements <br />imposed by the Division as part of its surface water monitoring program. Acute <br />toxicity testing through bio -monitoring sampling is required in: <br />1. East Flume 2. East Middle Flume 3. East Pyeatt <br />4. Horse 5. Middle Flume 6. Oak <br />drainages if mine -contaminated water is discharged. <br />B. Stream Channel Diversions <br />Drainageway 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(l)). <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 <br />the renewal process. These monitoring plans are adequate to monitor for the <br />Page 17 <br />Trapper RN7 Prepared by: R. Reilley <br />Nov 2017 <br />