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SPT <br />Penetration, <br />N Value <br />(blows/ foot) <br />Density of <br />Sand <br />4 (degrees) <br /><4 <br />Very loose <br /><30 <br />4 -10 <br />Loose <br />30 -35 <br />10 - 30 <br />Medium <br />35 - 40 <br />30 -50 <br />Dense <br />40 -45 <br />>50 <br />Very dense <br />>45 <br />Relationship between 4, and standard penetration number for sands, (from Meyerhof <br />1956, Foundation Engineering Handbook). <br />