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., <br />Corps of Engineers Method and the output of the spreadsheet program for each channel segment <br />are located in Appendix B.3 of this report. <br />Table 3-3 Diversion Channel Dimensions <br />Segment <br />No. Cumulative <br />Flow <br />(cfs) Bottom <br />Width <br />(ft) Side <br />Slopes Depth of <br />Flow <br />(ft) Depth of <br />Channel <br />(ft) Minimum <br />Riprap Dso <br />(in) Riprap <br />Thickness <br />(ft) <br />I 156 6 3H:IV 1.97 3 5 I <br />2 159 6 3H:IV 2?9 3 3 0.5 <br />3 172 6 3H:1 V 2.45 3 3 0.5 <br />The proposed diversion channel will be constructed within the boundaries of the existing <br />backfilled West Pit. Thus, the channel will be constructed over the waste rock material used for <br />the backfill. This waste rock on the upper surface is mainly from the Santa Fe Formation, and <br />contains some fines with gravels. Due to the temporary operation of the proposed evaporation <br />facility (less than 2 yeazs), and the fact that the channel will be constructed over waste rock, no <br />filter material between the riprap and the waste rock is proposed. However, the monitoring <br />program includes routine inspection of the channel which will provide for the necessary repairs <br />in the unlikely event erosion were to impair the integrity of the proposed channel. <br />u <br />Battle Mountain Resawces, /nc. DRAFf Shepherd ,lfiller, lnc. <br />y:l/¢Olb%4~k¢Mrv4lnport,loc 3-8 May 1l. l999 <br />