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• <br />• <br />L J <br />SNOWCAP COAL COMPANY, INC. <br />TABLE 134 <br />DRAINAGE CONTROL STRUCTURES <br />ROADSIDE SOUTH PORTAL (EXHIBIT 66) <br />Structure Cross-Section <br />Exhibit Description <br />Sediment Pond #8 20 Designed capacity 2.63 A.F. plus 400,000 gallons <br />(1.23 A.F.) with at least 1 ft. freeboard; <br />embankment slo es desi ned at 1v:2h <br />Sediment Pond #9 22 Designed capacity 1.03 acre-ft with at least 1 ft <br />freeboard; embankment slopes designed at <br />1v:2h <br />South Diversion Ditch 20 Designed capacity 3.5 cfs, gradient 0.3 - 5.0%. <br />Removed 2002 <br />U r Diversion Ditch 6C & 26 Desi ned ca ci 8.83 cfs, radient 20-23% <br />South Diversion Culverts A ndix 13-2 9" Minimum <br />Lower Catch Ditch No. 1 20 Desi ned ca aci 0.6 cfs, radient 1 <br />Lower Catch Ditch No. 2 20 Desi ned ca aci 2.4 cfs, radient 1 <br />Access Road Ditch Desi ned ca aci 0.13 cfs, radient 7% <br />Guardshack channel Desi ned ca aci 0.5 ds, radient 0.25% <br />Guardshack to Pond 8 Ditch Desi ned ca aci 0.5 cfs, radient 0.2% <br />Culvert to Pond 8 12" Minimum <br />Portal Diversion Desi ned ca aci 0.02 cfs, radient 1.5% <br />Portal Area Drain Pi 8" Minimum <br />Conve r Drain Pie 6"Minimum <br />To of RSRDA Drain Pi s 2-8" Minimum <br />Above RSRDA Drain Pipes Appendix 13-2 <br />P .RSS-28 12" Minimum <br />Combined RSRDA Drain <br />Pi Appendix 13-2 <br />P RSS-28 8" Minimum <br />T134-1 <br />(Rev 10/05) <br />