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<br />March 2000 <br />-8- <br />993-2099.150 <br />Surface Water Diversion Channels (see Section 6.0) <br />- SCS Storm Type II <br />- 100-year, 24-hour storm event 3.5 inches <br />- Diversion channel capacity 100-year, 24-hour event <br />- Maximum channel velocity w/o rip-rap 5 feet per second <br />- Rip-rapped channel Mannings "n" 0.035 Stability <br />0.040 Capacity <br />- Earthen channel Mannings "n" 0.030 Stability <br />0.035 Capacity <br />~~ <br />- Surface water runoff Curve Numbers (CN's) <br />• Original Ground CN= 66 (wooded) <br />CN = 71 (grass) <br />• Roads and Stockpile Surface CN = 90 <br />• Fill Slope CN = 50 <br />Cresson Ore <br />- Wet Density 110 pcf <br />- Dry Density 96 pcf <br /> <br />I:\97~2099\FINAL REPOR'IV099MAINl.DOC Golder Associates <br />