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• The following table describes the underlying filter material that will be used for each <br />section. The design of this material is based on studies done at Colorado State University <br />and presented in Design Hydrology and Sedimentology for Small Catchments. <br />C~ <br />During the excavation, azeas of lazge rock or actual bedrock may be encountered. When <br />this occurs, filter material may not be used. If bedrock is substantial, the riprap lining may <br />also be eliminated. For the filter material design, it is assumed that the base material will <br />have D50 of 2". The azea of the channel construction is generally rocky in nature. <br />Segment <br /># )tiprap <br />D50 (ft) Riprap Thickness <br />Range (ft) Filter Material <br />D50 (ft) Filter Material <br />Thickness (ft) <br />1 1.75 1.75-2.50 0.25 0.25-0.50 <br />2 1.75 1.75-2.50 0.25 0.25-0.50 <br />3 1.75 1.75-2.50 0.25 0.25-0.50 <br />4 None DNA DNA DNA <br />5 2.50 2.50-3.50 0.25 0.25-0.50 <br />6 1.00 1.00-2.00 0.25 0.25-0.50 <br />A filter material of 0.25 feet or 4" will work for all segments. <br />As shown on the Hydrology Map, the Cazbon Junction Canyon will be restored in its <br />original channel for the majority of the length upstream from the permanent diversion. For <br />this area, no lining will be needed. However, two portions of the channel, one near the <br />upper end of the diversion, and the other neaz the lower sump, will need to be tined with <br />riprap of D50 of L5 feet. A layer of 1.5 feet to 2.5 feet will be placed in a channel width <br />of 14 feet. No underlying filter will be employed in these azeas since the existing material <br />is rocky. The approximate lengths of the two upstream lined areas aze 150 feet and 350 <br />feet. <br />Certification and Inspecrion <br /> <br />The designs for the various structures have been appropriately certified. The sediment <br />control system will be inspected during construction and certified by a registered <br />professional engineer as required. <br />TROB, TR11(v1.0) 5-17 Revised 9/97, 08/02 <br />