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COLORADO <br /> a Division of Reclamation, <br /> Mining and Safety <br /> Department of Natural Resources <br /> General Assumptions: <br /> • 21"of overburden places on pit floors,min 3"of topsoil and reveg alfalfa <br /> • 3-6" min of overburden on slopes,min Yof topsoil and reveg dryland <br /> • 12 ac of ag field reclaimed minus 330LF of slope requiring backfill <br /> • Approx. 34 ac active mine area affected lands <br /> o Vertical highwalls in SE corner of areal and NE corner adjacent to Area 3 <br /> o All other internal pit slopes are generally 1:1 and require backfill. <br /> o Topsoil stockpiled above slope <br /> Notes: <br /> • Table only reflects input values changed(consolidated) from previous calculations <br /> • Does not include any unit cost changes or fixed values derived from the CAT and/or RS <br /> means handbooks <br /> Task Form Used Description <br /> 01a Demo Remove scale house (on-site disposal) and scale <br /> 02a Scraper Transport backfill material for ag field highwall <br /> 330 LF @ 15 ft.high vertical to 3HAV= 3988 cy,transported 120OLF <br /> 02b Scrapper Topsoil graded ag field highwall <br /> 50'x330'= 0.38 @ Y= 160 CY,transported 1200 LF <br /> 02c Reveg Reveg w/dryland mix graded area and transport path 1/2 ac <br /> 03a Scraper Regrade all highwalls slopes to 3H:1V <br /> 15'H x 140OLF vert=16917 CY overburden stripped areas needs <br /> backfill, <br /> 20'H x 140OLF vert=7519CY gravel bench areas cut fill, <br /> 35'H x 360OLF 1:1 to 2:1=122,500 misc. unreclaimed slopes need <br /> additional backfill placement <br /> Total 146,936 cy of material transported avg of 400 LF <br /> 03b Dozer Topsoil slopes <br /> op co <br /> mow, <br /> Physical: 1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 I �¢ <br /> Mailing: DRMS Room 215, 1001 E 62nd Ave, Denver, CO 80216 https://drms.colorado.gov <br /> Jared S. Polis, Governor I Dan Gibbs, Executive Director I Virginia Brannon, Director <br /> *1976 4L <br />