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included in these sections as an added measure to protect against localized erosion. Most of the <br /> terraces feed into an existing rip rap channel except for structure 5 which feeds into structure 8, another <br /> erodible channel. Structures 2 and 3 are the ditch along side the pile access haul road.They will need to <br /> be lined with rip rap as specified in the 100-year calculations, but it could be years before the pile gets <br /> high enough to require the access road. <br /> Sedimentology <br /> Sedimentology was modeled for the 10 Year storm. The sediment ponds reduce the settleable solids <br /> concentration to well below the 0.5 ml/I.A summary of the sediment pond performance is included in <br /> Table 1. <br /> Table 1. Sediment Pond Performance <br /> Peak Settleable <br /> Concentration (ml/1) <br /> Sediment Pond In Out <br /> RP-5 195.85 0.09 <br /> RP-4 188.80 0.00 <br /> RP-2-3 177.23 0.03 <br /> References <br /> OSM RE. Guidelines for the Use of the Revised Universal Soil Loss Equation on Mined Lands, Construction <br /> Sites, and Reclaimed Lands. Version 1.06. August 1998. <br /> USDA NRCS Conservation Engineering Division. Technical Release 55(TR-55). June 1986. <br /> USDA NRCS. Web Soil Survey. https://websoiIsurvey.sc.egov.usda.gov/App/HomePage.htm <br /> NOAA National Weather Service. Precipitation Frequency Data Server. <br /> https://hdsc.nws.noaa.gov/hdsc/pfds/ <br /> Fletcher, B. P. and Grace,J. S.,Jr. Practical Guidance for Estimating and Controlling Erosion at Culvert <br /> Outlets. 1972. Corps of Engineers Research, Report H-72-5, Waterways Experiment Station,Vicksburg, <br /> Mississippi. <br /> Blue Mountain Energy 4 Illustration 62 <br />