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How does the type of soil to be excavated affect the estimate?

How does the type of soil to be excavated affect the estimate?

Engineering   Civil-Engineering   
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The type of soil to be excavated affects the estimate for excavation as depending upon the nature of soil , different types of equipments might be required for excavating same quantity. For instance a hand shovel or a rake is sufficient for shallow excavations in soft or loose soil whereas a hard or dense soil requires sacrifiers or jumpers and Rocky soil might require use of crowbars, chisels or even blasting for excavation.

Also the amount and skill of labor is different depending upon the type of instrument and technique used for excavation thereby again affecting the cost estimate.

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