Laserfiche WebLink
owner of the affected facilities has been submitted. The Division has <br />previously approved the activities (4.04(6)). <br />III. Hydrologic Balance - Rule 4.05 <br />Volume 4 of the Trapper Mine permit application includes an assessment of the <br />probable hydrologic consequences of the proposed mining operation. Each year <br />Trapper assesses the ongoing impacts to the hydrologic system in its annual hydrologic <br />report submitted as Appendix W of the permit application. The probable hydrologic <br />consequences as set forth in Volume 4 and Appendix W are summarized below. <br />A. Water Quality Standards and Effluent Limitations <br />Surface discharge at the Trapper Mine is monitored under CDPS permit # CO- <br />0032115 issued by the Colorado Department of Public Health and Environment. <br />In addition, the applicant has quarterly reporting requirements imposed by the <br />Division as part of its surface water monitoring program. Acute toxicity testing <br />through bio- monitoring sampling is required in No Name, Middle Pyeatt, and East <br />Pyeatt drainages due to pit dewatering. No specific approvals are required by the <br />Division under this section. <br />B. Stream Channel Diversions <br />Drainage way reconstruction is discussed under Section 4.8.1.3, Vol. IV of the <br />permit application. <br />Channel lining structures, retention basins, and artificial channel roughness <br />structures are proposed for use to control erosion. These means are proposed <br />to be approved by the Division being that they are necessary to control <br />erosion; they are stable and will require infrequent maintenance. 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 the <br />increased sediment loads within the ephemeral drainages on the mine site. All <br />sediment ponds are designed to contain or treat the 10 -year, 24 -hour event and <br />safely pass the 25 -year, 24 -hour event, at a minimum. One MSHA size pond <br />exists on the site in the Coyote drainage. <br />Portions of haulroads, topsoil stripping areas and mining areas are projected for <br />the next permit term (2013 -2017) outside of the currently approved drainage and <br />Trapper Mine 23 July 9, 2013 <br />