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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 /> Vegetation health within each plot is fully detailed for 2012 and 2013 in Appendix B. The data <br /> rhave been simplified on Table 5 showing that vegetation amounts remained relatively constant <br /> through the summer of 2012 and 2013 with only minor fluctuations. <br /> Vegetation at approximately half of the ten 3-meter square plots showed some stress in 2012 <br /> during the dry hot summer months of July and August. One river birch tree (Betula <br /> toccidentalis), showed extreme stress by the end of the summer 2012, as leaves had completely <br /> fallen off the tree and it looked as if it might die. All other trees and shrubs within the ten 3- <br /> meter square plots were either stress free or showed some stress due to lack of water and heat <br /> by August 2012. However the same hot and dry late summer conditions were observed <br /> ' stressing trees and shrubs located further downstream of the Site. As stated previously, the <br /> Creek dries out typically sometime in May or June for several months each year and therefore <br /> by July and August trees and shrubs located along Ralston Creek both up and downstream of <br /> rthe Site can become stressed from lack of water. During July and August 2012, trees and <br /> shrubs were showing signs of stress in locations along the Creek both above and below the <br /> Site. <br /> The river birch tree which showed stress in 2012 rebounded somewhat during the summer of <br /> 2013 due to rainy spring conditions into the early summer. In addition, during one above normal <br /> rain event, the grates at the cutoff wall designed to keep large debris out of the 18-inch bypass <br /> ' pipe, became clogged causing the creek water level to rise and flow into the 42-inch overflow <br /> pipe thereby releasing flows down the Creek for several days in May. Although Creek flows <br /> never reached the lower end of the Site property, this available moisture was beneficial for the <br /> Schwartzwalder Mine Phase 1 -2013 Mitigation Monitoring Report Page 9 <br /> May 31,2014 <br />