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A SPT has been conducted in a borehole and the number of blows have been measured....

A SPT has been conducted in a borehole and the number of blows have been measured. The number of blows are recorded as 15, 23, and 27 for the first, second, and third 15 cm of penetration, respectively. The energy efficiency of the hammer is 75% and the effective vertical stress at the location of testing is 200 kPa. What is the corrected SPT value?

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