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' IRIS MITIGATION AND DESIGN,INC. <br /> IRIS 2022 Arapahoe Street <br /> MITIGATION AND DESIGN,INC. Golden,Colorado 80401 <br /> Environmental Consulting Phone: 720-272-1985 <br /> bleisure@irismitigation.com <br /> which serves as the main Site access. Restoration construction has been permitted and is <br /> ' currently progressing but is not scheduled to be completed until the 4th quarter of 2014 or the 1st <br /> quarter of 2015. <br /> The Creek riparian area within the Site was mapped by IRIS using the most recent aerial <br /> photographs available in 2011 and again in 2014 following the Flood. The Flood resulted in the <br /> ' riparian area vegetation being decreased from 3.04 acres in 2011 to 2.5 acres immediately <br /> following the Flood. This represents a 0.54 acre (18 percent) complete loss of visible vegetation <br /> from the riparian corridor. Much of the remaining riparian corridor experienced partial <br /> vegetation loss such that the riparian area was still visible on the aerial photograph but still <br /> greatly altered to reach 50 percent overall riparian vegetation loss (see Appendix A— Photos 1- <br /> 22). <br /> The Creek creek bed was mapped in 2011 and again in 2014 by IRIS using GPS field surveying <br /> and mapping. The creek bed area calculation increased from 0.73 acre in 2011 to 1.05 acre <br /> ' following the 2013 flood event. This represents a 0.32 acre (44 percent) increase in creekbed <br /> area revealing the enormous amount of material that moved through the valley during the Flood. <br /> The force of the material moving down valley and off the adjacent steep valley slopes filled the <br /> ' creekbed and increased its area by almost 50 percent in a few days. This extreme force is what <br /> snapped and uprooted massive trees, deposited large amounts of rock, gravel, sand and woody <br /> ' material across existing creekbed, adjacent riparian and what was previously upland fields (see <br /> ' Appendix A— Photos 1-22). This epic storm event resulted in significant permanent alterations <br /> of the landscape in and around the Creek. <br /> ' Schwartmalder Mine Phase 1 -2013 Mitigation Monitoring Report Page 6 <br /> May 31,2014 <br />