NGWA CWD Practice Questions - NGWA Certified Well Driller Exam

What does the uniformity coefficient (Cu) of an aquifer sand sample represent?

The ratio of the D60 grain size to the D10 grain size from a sieve analysis The percentage of fine grains passing the No. 200 sieve The ratio of the slot size to the grain diameter The permeability of the gravel pack in darcies

Correct Answer:

The ratio of the D60 grain size to the D10 grain size from a sieve analysis

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