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3.0 DESIGN PARAMETERS <br />Parameters for design were detemtinsd based on requirements set forth by OXBOW, and <br />requirements whhin the ~gLlatien! of the Celnrado Mined Land Reelametien Bn~-! for .osl <br />Mjpjtlg, specifically Rule 4.10 and references therein. Ths following lists important aspects <br />of the proposed coal mine waste baNc deign at the Sanborn Creek Mine, and the parameters <br />that were used as constraints. <br />Type Coal mine waste bank <br />Capacity 15 to 20 years at 8,000 to 7,000 cubic yards per year <br />Slopes No steeper than 2 horizontal to 1 vertical 12:1) overall slopes <br />(Rule 4.10.414)), static safety factor of 1.5 (Rule 4.10.412)) <br />Compaction 90 percent of the maximum dry density in accordance with <br />American Association of Stets Highway and Transportation <br />Officiab fAASHT01 T99-74 for ASTM D•898) in 24•irtclt <br />maxirt+urn thickness lifts (Rule 4.10.4131) <br />~'~ Haul Road 10 pertxnt maximum overall grade (Rule 4.03.11311, 30-foot <br />• wide rtlirlimum width, safety berm, stormwater ditch <br /> <br />Diversion Ditches Flows from a 100-year, 24-hour storm event (Rule 4.10.3(2)1 <br />Underdrain System As required by Rub 4.10.311) <br />Sediment Pond Contait the 10•year, 24hour storm and the associated <br />sediment, provide a non~elogging dewatering device, and an <br />emergerxy spillway system IRuk 4.05.813,41- <br />Overflow Spillway System A single overflow spillway able to transport flows from a 25- <br />year, 24-hour storm event (Rule 4.05.815)) <br />Reclamation Stockpdmg stripped topsoil, overtwrden, and haul road cut <br />material in the area of the proposed coal mine waste bank, <br />covering re-contoured waste with a minimum of 4 feet of <br />cover and topsoil, then revegetatuq (Rule 4.10.4151) <br />95255/1424.RPT Coal Mine Wute eenk Deeipn for tM Senbam Creet MNe <br />October 1996 WESTEC, Inc. <br />6 <br />