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L.1.3 Topsoil Replacement <br />Topsoil placed by Caterpillar 627 scrapers to an average thickness of 18-inches. <br />Equipment cost: <br />4 - Caterpillaz 627 scrapers @ $700/hour <br />Total hourly cost = $700/hour <br />Production Rate for placement: <br />Fill to be placed with scrapers w/o push loading. <br />Haul distances vary from 500 to 2,000 feet. <br />Average one-way distance of 1,400 feet assumed. <br />Resistance (grade and rolling) = 8% <br />Cycle time = 3.75 min (loaded), 2.5 min (empty), 6.25 min (total) <br />Bulking factor = 1.0 <br />Hau] Volume = 20 yd3/1.0 = 20 pcy <br />Unadjusted production rate: <br />(20 pcy/load)(1 load/6.25 min)(60 min/hour)(4 scrapers) = 768 pcy/hr <br />Production adjustments = 0.83 for job efficiency, 0.92 for operating altitude <br />(768 pcy/hr)(0.83)(0.92) = 586 pcy/hr <br />Unit Cost = ($700/hour)(1 hour/586pcy) _ $1.19/pcy <br />Coverage assuming average 1.5-foot average thickness over fill area: (1.5 <br />feet)(43,560 ft2/acre)(lpcy/27fr3) = 2,420 pcy/acre <br />Unit Cost = (2,420 pcy/acre)($1.19/pcy) _ $2,880/acre <br />L.1.4 Topsoil Grading <br />Assumptions and costs same as backfill grading (L.1.2) _ $260/acre <br />L.1.5 Spillway Construction <br />L.1.5.1 Vegetated Channel Sections <br />Excavation (at $4.80/cy) _ $8.40/ft <br />Revegetation (a[ $156.24/acre) _ $0.09/ft <br />Total Unit Cost = $8.49/ft <br />L.1.5.2 Concrete -Faced Sections <br />Excavation (at $4.80/cy) _ $3.78/ft <br />Concrete Facing (at $180/finished cy) _ $32.40/ft <br />Tota] Unit Cost = $36.18/ft <br />Battle Mountain Resources, lnc. 36 Telesto Solutions, /nc. <br />P:Uivjccut212-Newmom(SaN.uis)\SariLUis\PCrmit Amenamem- West Pit Management\Vd Report&pDFSWermuAmendment_vd.doc October 2006 <br />