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Which of the following is not included under preliminary survey?

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Which of the following is not included under preliminary survey?

(a) Knowing the general topography of the area

(b) Knowing the lithology of the area

(c) Knowing the structural condition of the rocks

(d) Driving the pilot tunnels

I have been asked this question in a national level competition.

My question comes from Geological Investigations in section Tunnels of Engineering Geology

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Right choice is (d) Driving the pilot tunnels

Explanation: The preliminary surveys include: Knowing the general topography, the lithology, hydrological conditions in the area and structural condition of the rocks. Driving pilot tunnels, bore-hole drilling are considered under detailed surveys.

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