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Section 2 <br />Topaz Mine <br />2.5 Conclusions and Recommendations <br />CDM reviewed Tetra Tech's surface water control structure designs (Tetra Tech 2007) <br />for the Topaz Mine. Based on our review, CDM recommends a grass-lined channel <br />with a depth of 2.5-feet for Channels 1 and 2. CDM also concludes the following <br />regarding Tetra Tech's drainage report for the Topaz Mine: <br />1. The proposed berm elevation of Basin 3 is sufficient to contain the 100-year, <br />24-hour storm event. <br />2. The proposed catchment basin of Basin 4 is sufficient to contain the 100-year, <br />24-hour storm event. <br />A plan view of the catch basin and channels is included as Exhibit A-1 and drainage <br />feature details and cross sections are included in Exhibit A-2. <br />??i-? <br />2-5 <br />0: 84988 - Denison\7ask Order 1 - Sunday Mines Drainage Study\Report\Final ReportiFinal Sunday Mines Drainage Report_052208.dm