2. A contractor has a project to construct a large office building with an underground parking lot. Link-Belt 4300 tracked hydraulic backhoe excavator is used to excavate and load the excavated material into a 10 CY dump truck. The maximum digging depth of the excavator is 24 feet and it is equipped with a 2.5 CY bucket. The material is tough clay and job conditions are considered to be average. The contractor plans to work an average of 50 min per hour. What is the estimated productivity in BCY/hour if the swell factor of the material is 0.74? 3. From the previous question, if the contractor estimates hourly cost for hydraulic backhoe excavator; $25.75/hour for ownership cost, $32.00/hour for operating cost, and $28.50/hour for operator wages. a. What is the estimated unit cost in $/BCY of the excavator to excavate for job that there are sufficient dump trucks so that the excavator never sits idle? b. The contractor reviewed the plans for the parking lot and determined the dimensions of the required excavation to be 20 feet deep, 75 feet wide, and 120 feet long. How many days will it take to complete the excavation if the productivity of the excavator is the only determining factor? Assume the contractor will work 8 hours per day. 2. A contractor has a project to construct a large office building with an underground parking lot. Link-Belt 4300 tracked hydraulic backhoe excavator is used to excavate and load the excavated material into a 10 CY dump truck. The maximum digging depth of the excavator is 24 feet and it is equipped with a 2.5 CY bucket. The material is tough clay and job conditions are considered to be average. The contractor plans to work an average of 50 min per hour. What is the estimated productivity in BCY/hour if the swell factor of the material is 0.74? 3. From the previous question, if the contractor estimates hourly cost for hydraulic backhoe excavator; $25.75/hour for ownership cost, $32.00/hour for operating cost, and $28.50/hour for operator wages. a. What is the estimated unit cost in $/BCY of the excavator to excavate for job that there are sufficient dump trucks so that the excavator never sits idle? b. The contractor reviewed the plans for the parking lot and determined the dimensions of the required excavation to be 20 feet deep, 75 feet wide, and 120 feet long. How many days will it take to complete the excavation if the productivity of the excavator is the only determining factor? Assume the contractor will work 8 hours per day