13. (RS Means Detailed Estimate) The following is the data given in the RS means cost guide to estimate the cost of the foundation earthwork excavation activity (at the depth ofup to 15 ft). Calculate the labor hours (man hours) required per bank cubic yard(bcy) of excavation and the total cost to excavate 50,000 bcy of earthwork. Add 20%for overhead and profit in the estimate. (200 Points) CSI activity code: 31.23.16.13 Excavating trench 14 ft to 20 ft deep with 1 bcy excavator Daily production rate(output) = 301 bcy/day (based on 8 hrs of work per day) The crew involved for this activity is 1 laborer @ $31.60/ hr 1 Crane operator @ $42.55/ hr 1 hydraulic excavator @$669.20/ day 1 trench box = @113.40/ day3

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