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-5- <br /> 1 - D9L dozer @ $144.29/hr. _ $ 577.00 <br /> 1 - Operator @ $18.00/hr. = $ 72.00 +1000 <br /> a Total Cost $. /649.00 010F <br /> 5. Portal Area Backfilling <br /> It is assumed that one half of the portal area pad is fill and one-half is <br /> cut. Based on the glory hole and tunnel profile, a total of 8,300 CY of <br /> material must be moved. <br /> A D9L will be used to push up the material. It is assumed that the average <br /> push distance is 75 feet at an average slope of 25%. <br /> A D9L has an unadjusted production rate of 1 ,800 CY/hr. The adjustments are <br /> as follows: <br /> Average operator 0.75 <br /> 50 Minute work hour 0.84 <br /> Grade factor 25% 0.50 <br /> Overall Factor 0.32 <br /> The adjusted production rate is 576 cubic yards per hour. At this rate the <br /> total cost would be $2,337.00. <br /> The total cost for backfilling and grading isr$199.096.00. A 'i �'� �2 <br /> Topsoil Replacement <br /> 1 . Conveyor corridor station 4+00 to 34+00 <br /> Scrapers will be used to move the topsoil from the stockpile to the conveyor <br /> corridor. A D8L dozer will be used to grade the deposited topsoil and a D9L <br /> is required for loading the scraper. With an average haul distance of 1,500 <br /> feet, a 637D scraper has the following cycle time: <br /> Fixed time - 1 .1 minutes <br /> Haul time (12% total resistance) 2.2 minutes <br /> Return time (0% resistance) 0.6 minutes <br /> Cycle Time 3.9 minutes <br /> In a 50 minute working hour, a scraper can complete 12.8 cycles at 26 CY per <br /> cycle or 333 CY/hr. Three scrapers can be handled by one D9L dozer with this <br /> cycle time. A total of 12,500 CY of topsoil will have to be replaced on this <br /> section at the following cost: <br /> 1 - D9L dozer @ $144.29/hr. = $ 1 ,804.00 <br /> 1 - D8L dozer @ $110.10/hr. = 1 ,376.00 <br /> 3 - 637D scrapers @ $626.38/hr. = 7,830.00 <br /> 5 - Operators Cd $90.00/hr. = 1 ,125.00 <br /> Total Cost $ 12,135.00 <br />