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Key To Classification and Symbols <br /> <br />Correlation of Penetration Resistance with Relative Density and Consistency <br /> <br />~ Sands <br /> <br />No. of SPT Blows, <br /> <br />0 to 4 Very Loose <br />5 to I0 Loose <br />11 to 20 Firm <br />21 to 30 Very Finn <br />31 to 50 Dense <br />> 51 Very Dense <br /> <br />Consistency* <br /> <br />Silts and Clays <br /> <br />0 to I Very Soft <br />2 to 4 Soft <br />5 to 8 Firm <br />9 to 15 Stiff <br />16 to 30 Very Stiff <br />_> 31 Hard <br /> <br /> Symbols <br /> <br />I=I <br />50=2" <br />BQ,NX,NQ,NW <br /> <br /> Undisturbed Sample (LID) Recovered <br /> <br /> Number of Blows (50) to Drive the Split Spoon Sampler a Number of Inches (2) <br /> <br /> Core Barrel Sizes Which Obtain Cores 1-7/16", 2-1/8", 1-7/8", and 2-1/16" in <br /> Diameter, Respectively <br /> <br /> 65% Percentage (65) of Rock Core Recovered Relative to Cored Length <br /> <br /> RQD Rock Quality Designation - Percentage of Recovered Cored Length Consisting <br /> of Moderately Hard or Better Core Segments 4 or More Inches Long <br /> Approximate Water Table 24 Hours or More After Drilling <br /> Approximate Water Table At Time of Drilling (Within I Hour) <br /> <br /> <I Loss of Drilling Fluid <br /> <br />*Terminology may be altered if presence of gravel, cobbles, or boulders interferes with accurate <br /> measurement of standard penetration resistances. <br /> <br /> <br />