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<br />Equipment: D-8N dozer <br />Production rate: 1.5 acres/hour <br />Bench area = 17 acres <br />(17 acres / 1.5 acres hour) = l 1.5 hours = 11.5 hours ($135/hour) _ $1,552 <br />TOTAL ROM AREA RIPPING COSTS ( ~ / <br />REMAINING RECLAMATION COST OBLIGATION ($1,552 t`R/ <br />~K <br />E.4.2 Grading ~'f Area <br />Equipment: D-8N dozer <br />Production Rate Assumptions: <br />Assume top foot will be graded over 22 acres including outslopes. <br />Area requiring grading = 43,560 fr3 (1 fr) / 27 fr3 = I ,613 yd3/acre <br />22 acres (1,613 yd3/acre) = 35,500 yd3 <br />Production Rate: <br />Average push distance = 50 fr <br />Production rate = 1,400 yd3/hour(unadjusted) <br />Job efficiency 0.83 <br />Slope adjustment 1.05 <br />No altitude adjustment <br />Material type correction factor (hard) 0.80 <br />Operator efficiency (average) 75% <br />Weight correction factor -earth dry packed 0.90 (i.e., earth dry packed weight <br />estimated to be 2,550 Ibs/yd3 the D-8N has a rated capacity of 2,300Ibs/yd3) <br />Weight correction factor = 2,300 Ibs/yd3 / 2,5501bs/yd3 = 0.90 <br />Adjusted production rate <br />1400 yd3/Iu•(0.83)(1.05)(0.75)(0.80)(0.90)=659 yd3/hour <br />Adjusted production rate = 659 yd3/hour <br />35,500 yd3 (659 yd3/hour) = 54 dozer hours <br />54 dozer hours ($ 135/hour) _ $7,290 <br />TOTAL ROM AREA GRADING COSTS <br />REMAINING RECLAMATION COST OBLIGATION <br />E.4.3 Topsoil Placement and Grading <br />Equipment: 627 scraper <br />$7,29 <br />PRELIMINARY DRAFT <br />FOR DISCUSSION PURPOSES ONLY <br />