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at this time for either the south side drainage from the fill or the northeast drainage from the <br />fill. In a phone call on March 31, 2009 with Trapper Mine personnel, the Division discussed <br />possible changes to the drainage design for Horse Gulch Fill to incorporate 100-year channels <br />to meet the requirements of 4.09.2(7). Also discussed was utilizing two riprap downdrains as <br />recommended by the Agapito Report, rather that the single north downdrain as shown on the <br />Trapper Figure T-1. <br />Should these changes be implemented, please provide revised surface drainage calculations, <br />including SEDCAD design information. <br />7. Table 4.9-3 reflects the projected bank cubic yards of topsoil to be salvaged and replaced; <br />however, the K-Pit area, Horse Gulch Fill and K/G Buttress Fill are not included with the costs <br />associated with tables 1.4-8 and 1.4-9 which provide a summary of topsoil replacement costs <br />for the Trapper Mine. Please acknowledge if the costs in tables 1.4-8 and 1.4-9 include the cost <br />of topsoil salvaging and replacement for the K-Pit area, the Horse Gulch Fill and the K/G <br />Buttress Fill. If they do not, please revise the costs in tables 1.4-8 and 1.4-9 to reflect topsoil <br />salvaging and replacement in these areas. <br />8. A summary of estimated revegetation quantities and costs is associated with Table 1.4-10. This <br />table does not reflect the additional costs of revegetation associated with the K-Pit, Horse <br />Gulch Fill, and K/G Pit Buttress Fill. Please acknowledge if the costs in Table 1.4-10 include <br />the costs to revegetate the K-Pit, Horse Gulch Fill, and the K/G Buttress Fill, or revise the costs <br />to reflect the revegetation of these areas. <br />It is understood that Trapper Mine is in the process of revising submittals based on conversations with <br />the Division. The adequacy concerns noted above do not reflect the entirety of the Divisions adequacy <br />comments. Trapper's submittals, based on the March 3rd adequacy comment and the March 17th <br />meeting, were received April 2nd and are in the process of review. At the receipt of further submittals, <br />the Division will provide adequacy comments as necessary. <br />If you have any questions feel free to contact me. (303) 866-3567 ext. 8134 <br />Sincerely, <br />Jason M Y*k <br />Environmental Protection Specialist