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DETAIL 1 DETAIL 2 <br /> RIPRAP INSTALLATION <br /> 7.4'FREEBOARD <br /> 2xD� <br /> EXISTING RIPRAP AT <br /> GROUND <br /> SEE DETAIL 2 FOR CROSS SECTION WRL TOE <br /> RIPRAP AT WRL TOE 25 <br /> DISCHARGE POINT D50=9-in <br /> Dm in=6-in <br /> ! Dmax=12-in <br /> I SIdeslopes=1.3HAV <br /> Channel Slope=45% <br /> I <br /> Figure 9. WRL Slopes and Cap Rock D50 (taken from Map G-2). <br /> Capping the WRL with coarse angular rock will protect it from eroding into the drainage above <br /> North Clear Creek. Surface water that infiltrates into the WRL will be cleaned of sediment as the <br /> WRL will act as a sand and gravel filter. These two features of the WRL will ensure that <br /> sediment and loose material is not discharged into North Clear Creek. During initial construction <br /> of the WRL toes, temporary sediment controls such as silt fences or erosion control logs will be <br /> installed. These structures will be redundant and removed as the finished WRL lifts are installed <br /> up the drainage. The end result will be a WRL that is an improved version of the road fill slopes <br /> found along the CCP: modest slope of broken rock freely draining into natural drainages covered <br /> with trees and vegetation. <br /> Table 7 shows a comparison of the pre-mine and post-mine discharge velocity at each discharge <br /> outfall. These velocities were calculated using SEDCAD analysis of the drainage feed each <br /> outfall at the peak discharge of the 100-YR 24-HR event. The post mine velocity will be lower <br /> than the pre-mine discharge, ensuring that discharges from the drainages will not lead to erosion <br /> into the North Fork of Clear Creek. <br /> Young Ranch Resource <br /> ®Lewicki&Associates <br /> December 2021 G-6 <br />