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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 WET Testing <br />through sampling is required in East Pyeatt, Oak, Horse, Middle Flume, East <br />Middle Flume and East Flume drainages. No specific approvals are required by <br />the Division under this section. <br /> <br />B. Stream Channel Diversions <br /> <br />Drainage way reconstruction is discussed under Section 4.8.1.3, Vol. IV of the <br />permit application. <br /> <br /> <br />1.Trapper will configure future reconstructed drainages based on the typical <br />design parameters detailed on Figures 4.8-1a and 4.8-1b of the permit. <br />Stabilization of the reconstructed drainages will be done primarily by <br />constructing checkdams and dozer basins within the channel and the <br />establishment of vegetation. During the PR07 review process, Trapper <br />developed a model that was used to determine the number of check dams that <br />would need to be installed within a section of reconstructed channel based on <br />the watershed characteristics of the basin contributing run-off to the channel. <br />Dozer basins can then be installed to substitute a number of check dams based <br />on the design parameters outlined in the permit. Trapper will provide the <br />Division with a summary of the as-built parameters for the drainages <br />constructed each year with the Annual Reclamation Report. The Annual <br />Reclamation Report is submitted as a revision to Appendix W of the permit <br />each year. Trapper may also use several other products or techniques to help <br />stabilize the channel such as roving material placement, straw bales, brush, <br />erosion control mats and blankets as well as soil confinement systems. If <br />Trapper plans to install drop structures, rip-rap lining or other channel liners <br />that are impervious, they will obtain Division approval. These means have <br />been previously approved by the Division being that they are necessary to <br />control erosion; they are stable and will require infrequent maintenance. <br />(4.05.4(2)(a)). <br /> <br />C. Sedimentation Ponds <br /> <br />Sediment ponds are discussed under Section 4.8.1.4, Vol. IV of the permit <br />application. <br /> <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 /> <br /> <br /> <br />29 <br /> <br />Trapper MineJuly 9, 2013 <br /> <br />