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To: Matt Montgomery <br />U.S. Army Corps of Engineers ✓ <br />9307 South Wadsworth Boulevard <br />Littleton, CO 80128 -6901 <br />Re: Schwartzwalder Mine 2012 Phase 1 - Construction Activity Actual Area Impact and Mitigatio1 <br />Progress Reports <br />Dear Matt: <br />On behalf of Cotter Corporation (N.S.L.), enclosed are the Schwartzwalder Mine 2012 Phase 1 - Construction <br />Activity Actual Area Impact and Mitigation Progress Reports. Please review these reports and feel free to <br />contact me for any further clarifications. <br />Thank you for reviewing these materials and for working with us on this project. <br />Sincerely, <br />IRIS MITIGATION AND DESIGN, INC. <br />Blair Leisur ' c. <br />Principal/ enior Scientist <br />Cc: John Hamrick, Cotter Corporation (N.S.L.) <br />Craig Hansen, U.S. Fish and Wildlife Service <br />Sarah Fowler, U.S. Environmental Protection Agency <br />Tom Kaldenbach, Colorado Division of Reclamation, Mining, and Safety <br />Mike Harris, Colorado Department of Public Health and Environment <br />Encl. <br />tT IRIS <br />MITIGATION AND DESIGN, INC. <br />Environmental Consulting <br />Letter of Transmittal <br />+�k f/1/q77-oo <br />IRIS MITIGATION AND DESIGN, INC. <br />2022 Arapahoe Street <br />Golden, Colorado 80401 <br />Phone: 720 - 272 -1985 <br />bleisure@irismitigation.com <br />Date: <br />February 13, 2013 <br />From: Blair Leisure <br />IRIS Mitigation and Design, Inc. <br />2022 Arapahoe Street <br />Golden, CO 80401 <br />RECEIVED <br />FEB 2 0 2013 <br />Division of Reclamation, .ZC' <br />Mining & Safety <br />