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SNOWCAP COAL COMPANY, INC. <br />TABLE 13-4 <br />DRAINAGE CONTROL STRUCTURES <br />I,~ <br />• <br />NORTH DECLINE SITE EXHIBIT 12C <br />Structure Cross-Section Description <br /> Exhibit <br />Sediment Pond #7 22 Designed capacity 0.25 A.F. with at least 1 ft <br /> freeboard; embankment slopes designed at <br /> 1 v:2h <br />West Diversion Ditch #1 22 Designed capacity 12.88 cfs, slopes designed at <br /> less than 1v:1h, maximum radient 4.6% <br />East Diversion Ditch #1 22 Designed capacity 1.38 cfs, slopes designed at <br /> less than 1v:1 h, maximum radient 3.5% <br />East Diversion Ditch #2 22 Designed capacity 7.27 cfs, slopes designed at <br /> less than 1v:1 h, maximum radient 1.9°!0 <br />Channel Reestablishment 21 Designed capacity 470 cfs, slopes designed at <br /> less than 1v:2h, maximum radient 7.5% <br />Reclamation Collection Maximum design capacity 1.3 cfs, 1' deep V- <br />Ditches ditch with slopes designed at less than 1v:1 h, <br /> maximum radient 7.5% <br />East Sump Design capacity 0.08 acre-ft with at least 1 ft <br /> freeboard; embankmentslo es 1v:2h <br />West Sump Design capacity 0.32 acre-ft with at least 1 ft <br /> freeboard; embankment slo s 1v:2h <br />T13-4-4 <br />(Rev 10/05) <br />