Laserfiche WebLink
<br />F.1.2 Grading <br />Production Rate Assumptions: <br />Assume top foot will be graded over all roads <br />Area requiring grading = 35 acres(43,560 ft3/acre)(] fr)(1 yd3/27 ft3) = 56,500 yd3 <br />Production Rate: <br />Average push distance = 50 ft <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 2,300 Ibs/yd3) <br />Weight correction factor = 2,300 Ibs/yd3 / 2,550 Ibs/yd3 = 0.90 <br />Adjusted production rate <br />1400 yd3/hr (0.83)(1.05)(0.75)(0.80)(0.90)=659 yd3/hour <br />Adjusted production rate = 659 yd3/hour <br />56,500 yd3 (659 yd3/hour) = 86 dozer hours <br />86 dozer hours ($135/hour) ~$ l 1 610.6 jL <br />TOTAL ROADWAY RTPPI/NG AND GRADING COSTS ~ g~ <br />REMAINING RECLAMATION COST OBLIGATION $14,715 ~ <br />F.1.2 Topsoil Placement and Grading <br />Equipment: 627 scraper <br />D-8N dozer <br />Topsoil Placement: <br />Topsoil will be replaced using a 627 scraper <br />Production Rate: <br />Topsoil volume <br />43,560 ftz/acre (1.5 feet)(] yd3/27 ft3) = 2,420 yd3/acre (35 acres) = 84,(170 yd3 <br />Fill to be placed using a Caterpillar 627 scraper at a cost of $140/hour <br />Average haul distances of 1,200 feet <br />Total resistance (grade and rolling) is 8% <br />Cycle time: Loaded 3.5 minutes Empty 2.25 minutes <br />PRELIMINARY DRAFT <br />FOR DISCUSSION PURPOSES ONLY <br />