A crawler hoe having a 3-cy bucket and whose cost per hour, including the wages to an operator, is $86, will excavate and load haul units under each of the stated conditions. The maximum digging depth of the machine is 25 ft. Determine the cost per bank cubic yard for each condition.
Condition | (1) | (2) | (3) | (4) |
Material | Sandy clay | Hard clay | Rock, well blasted | Sand and gravel |
Depth of excavation (ft) | 10 | 18 | 15 | 20 |
Angle of swing (degrees) | 60 | 90 | 90 | 150 |
Percent swell | 20 |
|
| 13 |
Efficiency factor (min-hr) | 45 | 50 | 50 | 55 |
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