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<br />ce <br /> <br />'re <br /> <br /> <br />A typical section of this protection and fill limits are shown on <br />Figure 3. The waste rock and WWF slope protection should extend to the limits <br />shown, to the top edge of the fi 11, and fi ve feet vert i ca 11y below grade. <br />The thickness of the levee should be a minimum of 20-feet in the channel area <br />near the Water Treatment Plant. <br /> <br />7.2 Emergency Water Storage Pond <br />A similar situation exists on the side of the Proposed Emergency Storage <br />Pond Embankment near Ralston Creek. Flow velocities are about 10 feet per <br />second. This velocity would require rip rap of approximately 15 inches median <br />diameter. Use of the waste rock secured by WWF is recommended. The location <br />of the waste rock and WWF protection is shown in Figure 3. <br /> <br />The waste rock and WWF protection should extend vertically to four feet <br />above the water surface and five feet below the toe of the embankment. <br /> <br />7.3 Tributary Watershed <br />As discussed in section 6.3, a 36 inch steel pipe (CSP) culvert routed <br />around the Water Treatment Plant, a reinforced concrete headwall and struc- <br />tural steel trashrack and debris posts are recommended. The location of <br />these facilities are shown in Figure 3. The esp culvert may be below ground <br />water elevations during part of the year. Asphalt coated esp is recommended <br />for longest life under these conditions. The additional cost of asphalt <br />coated esp, is less than 5900.00. <br /> <br />The trash rack should be constructed at least at a 1:1 slope so floating <br />deb"; s wi 11 float to the top where it may be removed by ma i ntenance forces. <br /> <br />7-2 <br />