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IRIS <br />MITIGATION AND DESIGN, INC. <br />Environmental Consulting <br />IRIS MITIGATION AND DESIGN, INC. <br />2022 Arapahoe Street <br />Golden, Colorado 80401 <br />Phone: 720 - 272 -1985 <br />bleisure @irismitigation.com <br />SCHWARTZWALDER MINE 2012 ACTUAL AREA IMPACT AND <br />MITIGATION - PROGRESS REPORT <br />IRIS Mitigation and Design, Inc. (IRIS) Senior Scientist Blair Leisure is assisting Cotter <br />Corporation (N.S.L.) (Cotter) in the Phase 1 mitigation efforts at the Schwartzwalder Mine <br />located in Golden, Colorado. The purpose of this report is to update both the U.S. Army Corps <br />of Engineers (USACE) and the U.S. Fish and Wildlife Service (USFWS) on the mitigation efforts <br />completed by Cotter in 2012 at the Schwartzwalder Mine. IRIS worked with contractor <br />American Civil Contractors (ACC) to kick off this mitigation effort following Phase 1 construction <br />activities. <br />In June 2012, ACC completed site clean -up and excavation at four riparian mitigation areas <br />located just upstream of the cut -off wall (0.07 acre total) and one upland restoration area also <br />located upstream of the cut -off wall (0.59 acre total). As planned, the 0.04 acre riparian creation <br />area located farthest to the west had approximately 2 feet of soil excavated with the top 6 <br />inches of topsoil cleaned of rocks and debris and restored to the site. Approximately 6 inches of <br />soil including rocks and debris were removed from the 0.03 acre central and eastern riparian <br />mitigation areas. These two areas then received an addition of approximately 6 inches of <br />imported topsoil. An approximately 0.09 acre riparian restoration area was cleaned of rocks and <br />debris before having approximately 6 inches of imported topsoil added. Lastly, an <br />Schwartzwalder Mine Actual Area Impact Progress Report Page 1 <br />January 2013 <br />