Which Well Is Least Likely to Need Pumping

Which well is least likely to need pumping?

A) a well that reaches water very near the surface at an unconfined sand and gravel aquifer
B) a well that is drilled below a confining shale layer to a confined sandstone aquifer
C) a well that is drilled deep in an unconfined sandstone aquifer
D) any well in a limestone aquifer

Correct Answer:

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