Laserfiche WebLink
~~ <br />u <br />• <br />SNOWCAP COAL COMPANY, INC. <br />TABLE 13-4 <br />DRAINAGE CONTROL STRUCTURES <br />ROADSIDE NORTH PORTAL EXHIBIT 86 <br />Structure Cross-Section Description <br /> Exhibit <br />Sediment Pond #4 21 Designed capacity 0.42 acre-ft with at least 1 ft <br /> freeboard; embankment slopes designed at <br /> 1 v:2h. Backfilled 2002 <br />Sediment Pond #5 21 Designed capacity 0.51 A.F., with at least 1 ft <br /> freeboard; embankment slopes designed at <br /> 1v:2h. Backfilled 2002 <br />Sediment Pond #13 86 Designed capacity 1.11 AF wit 1 ft freeboard; <br /> embankment slo s desi ned at 2 to 3h:1v <br />Cameo Sewage Evaporation Removed from service 1982. <br />Pond <br />West Diversion Ditch 21 Designed capacity 3.35 cfs, slopes designed at <br /> less than 1v:1h, maximum radient 4.3% <br />East Diversion Ditch 21 Designed capacity 42.6 ds, slopes designed at <br /> less than 1v:1h, maximum radient 4.2% <br />East Collection Ditch 21 Desi ned ca aci 1.5 cfs, radient 1.0% <br />East Collection Culvert 8" Minimum <br />West Collection Ditch 21 Desi n ca aci 1.0 cfs, radient 2% <br />West Collection Culvert 6" Minimum <br />Drainage Ditch west of TS 21 Design capacity 1.1 cfs, gradient 1% (Backfilled <br />Piles 2002 <br />Culvert west of TS files 8" Minimum Removed 2002 <br />Shop Area Swale 21 Design capacity 2.0 cfs, gradient 0.5%, 10:1 side <br /> slo es <br />Portal Sump 36" wide x 16" deep grated drain in front of the <br /> belt and intake portals with 10x20x6' deep sump <br /> for min Backfilled 2002 <br />T13-4-2 <br />(Rev 10/05) <br />