A contractor has been awarded a contract for the construction of a regional shopping center. The…

A contractor has been awarded a contract for the construction of a regional shopping center. The project plans and specifications require the construction of a 3-foot compacted fill to support the parking lot for the shopping center. Contract drawings show the required fill to measure 800 feet by 900 feet. The contractor plans to use six single-engine scrapers to haul the fill material from a borrow site that is located 5,000 feet from the project site. Information about the scraper and performance characteristics are provided in Example 9.3 and Figure 9.11. Soil tests on the fill material

A contractor has been awarded a contract for the construction of a regional shopping center. The project plans and specifications require the construction of a 3-foot compacted fill to support the parking lot for the shopping center. Contract drawings show the required fill to measure 800 feet by 900 feet. The contractor plans to use six single-engine scrapers to haul the fill material from a borrow site that is located 5,000 feet from the project site. Information about the scraper and performance characteristics are provided in Example 9.3 and Figure 9.11. Soil tests on the fill material indicate a bank unit weight of 95 pounds per bank cubic foot. The swell has been determined to be 22%, and the shrinkage when compacted to the design density has been determined to be 12%. The contractor plans to use a single tracked dozer to push-load the scrapers to their rated heaped or weight capacity, whichever governs. The haul road has an average 4% uphill grade when traveling to the project site from the borrow site (scraper loading site). The rolling resistance of the haul road is estimated to be 115 pounds per ton, and the coefficient of traction is estimated to be 0.7. Road conditions limit the maximum speed of the scrapers to 26 miles per hour. Job conditions are considered unfavorable. Operational efficiency is estimated to be 45 minutes per hour. Ownership and operating cost for each scraper are estimated to be $220 per hour, and each scraper operator earns $60 per hour. Ownership and operating cost for the tracked dozer are estimated to be $125 per hour, and the dozer operator earns $57 per hour. a. What is the maximum load of the specified material (volume in loose cubic yards and weight in pounds) that each scraper can safely carry? b. What is the maximum speed that the scrapers can travel on the haul road when going from the borrow site to the project site loaded? c. What is the maximum speed that the scrapers can travel on the haul road when traveling from the project site to the borrow site empty? d. What is the estimated cycle time for one scraper if the scraper does not wait to be push-loaded? e. What is the estimated cost to excavate, transport, and spread the fill material in dollars per compacted cubic yards?

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