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-14- <br /> With a 32-foot reach (approximately 90% machine capacity) , a 245 backhoe can complete <br /> one cycle every 35 seconds (pg. 95, CFI) . The bucket fill-capacity is assumed to <br /> be 100%. Therefore, in a 50 minute working hour, a 245 backhoe with a 2.5 yd3 <br /> bucket can move 214 yd3 of material. At this rate, the job would be completed in <br /> 965 hours. <br /> A Caterpillar 245 backhoe rents for $18,400.00 per month, with an operating cost <br /> of $40.65 per hour. With a 10% location adjustment factor, the rental rate would <br /> be $20,240.00. Using 22 days per month, 8 hours per day, the hourly rental rate <br /> would be $115.00 + $40.65 = $155.65. <br /> In addition to the backhoe which will be used to excavate material, a D9U dozer <br /> will be required to grade the excavated material. The Division determined from <br /> the production nomograph on page 41 of. the Caterpillar Handbook, that a D9U with <br /> a blade capacity of 18.98 yd3 has an average production speed of 1.4 mph. The <br /> area to be graded is 46 feet in length. Therefore, a total of 2,914,560 ft2 must <br /> be graded. Assuming 50% overlap on each pass and a 15. 75 foot size blade, <br /> 24,271 ft2 can be graded each 50 minute work hour. Therefore, it would take 120 <br /> hours to grade the backfilled area. <br /> The total cost for downgrading the roads would be: <br /> 1 - 245 backhoe: 965 hours @ $155.65/hr. _ $150,202.00 <br /> 1 - D9U dozer: 120 hours @ $127.00/hr. - $ 15,240.00 <br /> 2 - Operators: , 1,085 hours @ $ 15.00/hr. _ $ 16,275.00 <br /> TOTAL COST: $181,717.00 <br />